./../vol/volume.c

Bug Summary

File:	dviced/./../vol/volume.c
Location:	line 2329, column 6
Description:	Assigned value is always the same as the existing value

Annotated Source Code

* This software has been released under the terms of the IBM Public

* License. For details, see the LICENSE file in the top-level source

* directory or online at http://www.openafs.org/dl/license10.html

/* 1/1/89: NB: this stuff is all going to be replaced. Don't take it too seriously */

System: VICE-TWO

Module: volume.c

Institution: The Information Technology Center, Carnegie-Mellon University

#include <afsconfig.h>

#include <afs/param.h>

#include <roken.h>

#include <ctype.h>

#include <stddef.h>

#ifdef HAVE_SYS_FILE_H1

#include <sys/file.h>

#endif

#include <rx/xdr.h>

#include <afs/afsint.h>

#ifndef AFS_NT40_ENV

#if !defined(AFS_SGI_ENV)

#ifdef AFS_OSF_ENV

#include <ufs/fs.h>

#else /* AFS_OSF_ENV */

#ifdef AFS_VFSINCL_ENV1

#define VFS

#ifdef AFS_SUN5_ENV

#include <sys/fs/ufs_fs.h>

#else

#if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV1)

#include <ufs/ufs/dinode.h>

#include <ufs/ffs/fs.h>

#else

#include <ufs/fs.h>

#endif

#else /* AFS_VFSINCL_ENV */

#if !defined(AFS_AIX_ENV) && !defined(AFS_LINUX20_ENV) && !defined(AFS_XBSD_ENV1) && !defined(AFS_DARWIN_ENV)

#include <sys/fs.h>

#endif

#endif /* AFS_VFSINCL_ENV */

#endif /* AFS_OSF_ENV */

#endif /* AFS_SGI_ENV */

#endif /* !AFS_NT40_ENV */

#ifdef AFS_AIX_ENV

#include <sys/vfs.h>

#else

#ifdef AFS_HPUX_ENV

#include <mntent.h>

#else

#if defined(AFS_SUN_ENV) || defined(AFS_SUN5_ENV)

#ifdef AFS_SUN5_ENV

#include <sys/mnttab.h>

#include <sys/mntent.h>

#else

#include <mntent.h>

#endif

#else

#ifndef AFS_NT40_ENV

#if defined(AFS_SGI_ENV)

#include <mntent.h>

#else

#ifndef AFS_LINUX20_ENV

#include <fstab.h> /* Need to find in libc 5, present in libc 6 */

#endif

#endif /* AFS_SGI_ENV */

#endif

#endif /* AFS_HPUX_ENV */

#endif

#include "nfs.h"

#include <afs/errors.h>

#include "lock.h"

#include "lwp.h"

#include <afs/afssyscalls.h>

#include "ihandle.h"

#include <afs/afsutil.h>

#include "daemon_com.h"

#include "fssync.h"

#include "salvsync.h"

#include "vnode.h"

100

#include "volume.h"

101

#include "partition.h"

102

#include "volume_inline.h"

103

#include "common.h"

104

#include "afs/afs_assert.h"

105

#include "vutils.h"

106

#include <afs/dir.h>

107

108

#ifdef AFS_PTHREAD_ENV1

109

pthread_mutex_t vol_glock_mutex;

110

pthread_mutex_t vol_trans_mutex;

111

pthread_cond_t vol_put_volume_cond;

112

pthread_cond_t vol_sleep_cond;

113

pthread_cond_t vol_init_attach_cond;

114

pthread_cond_t vol_vinit_cond;

115

int vol_attach_threads = 1;

116

#endif /* AFS_PTHREAD_ENV */

117

118

/* start-time configurable I/O parameters */

119

ih_init_params vol_io_params;

120

121

#ifdef AFS_DEMAND_ATTACH_FS1

122

pthread_mutex_t vol_salvsync_mutex;

123

124

125

* Set this to 1 to disallow SALVSYNC communication in all threads; used

126

* during shutdown, since the salvageserver may have gone away.

127

128

static volatile sig_atomic_t vol_disallow_salvsync = 0;

129

#endif /* AFS_DEMAND_ATTACH_FS */

130

131

/**

132

* has VShutdown_r been called / is VShutdown_r running?

133

134

static int vol_shutting_down = 0;

135

136

#ifdef AFS_OSF_ENV

137

extern void *calloc(), *realloc();

138

#endif

139

140

/* Forward declarations */

141

static Volume *attach2(Errorbit32 * ec, VolId volumeId, char *path,

142

struct DiskPartition64 *partp, Volume * vp,

143

int isbusy, int mode, int *acheckedOut);

144

static void ReallyFreeVolume(Volume * vp);

145

#ifdef AFS_DEMAND_ATTACH_FS1

146

static void FreeVolume(Volume * vp);

147

#else /* !AFS_DEMAND_ATTACH_FS */

148

#define FreeVolume(vp) ReallyFreeVolume(vp)

149

static void VScanUpdateList(void);

150

#endif /* !AFS_DEMAND_ATTACH_FS */

151

static void VInitVolumeHeaderCache(afs_uint32 howMany);

152

static int GetVolumeHeader(Volume * vp);

153

static void ReleaseVolumeHeader(struct volHeader *hd);

154

static void FreeVolumeHeader(Volume * vp);

155

static void AddVolumeToHashTable(Volume * vp, int hashid);

156

static void DeleteVolumeFromHashTable(Volume * vp);

157

#if 0

158

static int VHold(Volume * vp);

159

#endif

160

static int VHold_r(Volume * vp);

161

static void VGetBitmap_r(Errorbit32 * ec, Volume * vp, VnodeClass class);

162

static void VReleaseVolumeHandles_r(Volume * vp);

163

static void VCloseVolumeHandles_r(Volume * vp);

164

static void LoadVolumeHeader(Errorbit32 * ec, Volume * vp);

165

static int VCheckOffline(Volume * vp);

166

static int VCheckDetach(Volume * vp);

167

static Volume * GetVolume(Errorbit32 * ec, Errorbit32 * client_ec, VolId volumeId,

168

Volume * hint, const struct timespec *ts);

169

170

int LogLevel; /* Vice loglevel--not defined as extern so that it will be

171

* defined when not linked with vice, XXXX */

172

ProgramType programType; /* The type of program using the package */

173

static VolumePackageOptions vol_opts;

174

175

/* extended volume package statistics */

176

VolPkgStats VStats;

177

178

#ifdef VOL_LOCK_DEBUG

179

pthread_t vol_glock_holder = 0;

180

#endif

181

182

183

#define VOLUME_BITMAP_GROWSIZE16 16 /* bytes, => 128vnodes */

184

/* Must be a multiple of 4 (1 word) !! */

185

186

/* this parameter needs to be tunable at runtime.

187

* 128 was really inadequate for largish servers -- at 16384 volumes this

188

* puts average chain length at 128, thus an average 65 deref's to find a volptr.

189

* talk about bad spatial locality...

190

191

* an AVL or splay tree might work a lot better, but we'll just increase

192

* the default hash table size for now

193

194

#define DEFAULT_VOLUME_HASH_SIZE256 256 /* Must be a power of 2!! */

195

#define DEFAULT_VOLUME_HASH_MASK(256 -1) (DEFAULT_VOLUME_HASH_SIZE256-1)

196

#define VOLUME_HASH(volumeId)(volumeId&(VolumeHashTable.Mask)) (volumeId&(VolumeHashTable.Mask))

197

198

199

* turn volume hash chains into partially ordered lists.

200

* when the threshold is exceeded between two adjacent elements,

201

* perform a chain rebalancing operation.

202

203

* keep the threshold high in order to keep cache line invalidates

204

* low "enough" on SMPs

205

206

#define VOLUME_HASH_REORDER_THRESHOLD200 200

207

208

209

* when possible, don't just reorder single elements, but reorder

210

* entire chains of elements at once. a chain of elements that

211

* exceed the element previous to the pivot by at least CHAIN_THRESH

212

* accesses are moved in front of the chain whose elements have at

213

* least CHAIN_THRESH less accesses than the pivot element

214

215

#define VOLUME_HASH_REORDER_CHAIN_THRESH(200 / 2) (VOLUME_HASH_REORDER_THRESHOLD200 / 2)

216

217

#include "rx/rx_queue.h"

218

219

220

VolumeHashTable_t VolumeHashTable = {

221

DEFAULT_VOLUME_HASH_SIZE256,

222

DEFAULT_VOLUME_HASH_MASK(256 -1),

223

NULL((void *)0)

224

};

225

226

227

static void VInitVolumeHash(void);

228

229

230

#ifndef AFS_HAVE_FFS1

231

/* This macro is used where an ffs() call does not exist. Was in util/ffs.c */

232

ffs(x)

233

{

234

afs_int32 ffs_i;

235

afs_int32 ffs_tmp = x;

236

if (ffs_tmp == 0)

237

return (-1);

238

else

239

for (ffs_i = 1;; ffs_i++) {

240

if (ffs_tmp & 1)

241

return (ffs_i);

242

else

243

ffs_tmp >>= 1;

244

}

245

}

246

#endif /* !AFS_HAVE_FFS */

247

248

#ifdef AFS_PTHREAD_ENV1

249

/**

250

* disk partition queue element

251

252

typedef struct diskpartition_queue_t {

253

struct rx_queue queue; /**< queue header */

254

struct DiskPartition64 *diskP; /**< disk partition table entry */

255

} diskpartition_queue_t;

256

257

#ifndef AFS_DEMAND_ATTACH_FS1

258

259

typedef struct vinitvolumepackage_thread_t {

260

struct rx_queue queue;

261

pthread_cond_t thread_done_cv;

262

int n_threads_complete;

263

} vinitvolumepackage_thread_t;

264

static void * VInitVolumePackageThread(void * args);

265

266

#else /* !AFS_DEMAND_ATTTACH_FS */

267

#define VINIT_BATCH_MAX_SIZE512 512

268

269

/**

270

* disk partition work queue

271

272

struct partition_queue {

273

struct rx_queue head; /**< diskpartition_queue_t queue */

274

pthread_mutex_t mutex;

275

pthread_cond_t cv;

276

};

277

278

/**

279

* volumes parameters for preattach

280

281

struct volume_init_batch {

282

struct rx_queue queue; /**< queue header */

283

int thread; /**< posting worker thread */

284

int last; /**< indicates thread is done */

285

int size; /**< number of volume ids in batch */

286

Volume *batch[VINIT_BATCH_MAX_SIZE512]; /**< volumes ids to preattach */

287

};

288

289

/**

290

* volume parameters work queue

291

292

struct volume_init_queue {

293

struct rx_queue head; /**< volume_init_batch queue */

294

pthread_mutex_t mutex;

295

pthread_cond_t cv;

296

};

297

298

/**

299

* volume init worker thread parameters

300

301

struct vinitvolumepackage_thread_param {

302

int nthreads; /**< total number of worker threads */

303

int thread; /**< thread number for this worker thread */

304

struct partition_queue *pq; /**< queue partitions to scan */

305

struct volume_init_queue *vq; /**< queue of volume to preattach */

306

};

307

308

static void *VInitVolumePackageThread(void *args);

309

static struct DiskPartition64 *VInitNextPartition(struct partition_queue *pq);

310

static VolId VInitNextVolumeId(DIR *dirp);

311

static int VInitPreAttachVolumes(int nthreads, struct volume_init_queue *vq);

312

313

#endif /* !AFS_DEMAND_ATTACH_FS */

314

#endif /* AFS_PTHREAD_ENV */

315

316

#ifndef AFS_DEMAND_ATTACH_FS1

317

static int VAttachVolumesByPartition(struct DiskPartition64 *diskP,

318

int * nAttached, int * nUnattached);

319

#endif /* AFS_DEMAND_ATTACH_FS */

320

321

322

#ifdef AFS_DEMAND_ATTACH_FS1

323

/* demand attach fileserver extensions */

324

325

/* XXX

326

* in the future we will support serialization of VLRU state into the fs_state

327

* disk dumps

328

329

* these structures are the beginning of that effort

330

331

struct VLRU_DiskHeader {

332

struct versionStamp stamp; /* magic and structure version number */

333

afs_uint32 mtime; /* time of dump to disk */

334

afs_uint32 num_records; /* number of VLRU_DiskEntry records */

335

};

336

337

struct VLRU_DiskEntry {

338

afs_uint32 vid; /* volume ID */

339

afs_uint32 idx; /* generation */

340

afs_uint32 last_get; /* timestamp of last get */

341

};

342

343

struct VLRU_StartupQueue {

344

struct VLRU_DiskEntry * entry;

345

int num_entries;

346

int next_idx;

347

};

348

349

typedef struct vshutdown_thread_t {

350

struct rx_queue q;

351

pthread_mutex_t lock;

352

pthread_cond_t cv;

353

pthread_cond_t master_cv;

354

int n_threads;

355

int n_threads_complete;

356

int vol_remaining;

357

int schedule_version;

358

int pass;

359

byte n_parts;

360

byte n_parts_done_pass;

361

byte part_thread_target[VOLMAXPARTS255+1];

362

byte part_done_pass[VOLMAXPARTS255+1];

363

struct rx_queue * part_pass_head[VOLMAXPARTS255+1];

364

int stats[4][VOLMAXPARTS255+1];

365

} vshutdown_thread_t;

366

static void * VShutdownThread(void * args);

367

368

369

static Volume * VAttachVolumeByVp_r(Errorbit32 * ec, Volume * vp, int mode);

370

static int VCheckFree(Volume * vp);

371

372

/* VByP List */

373

static void AddVolumeToVByPList_r(Volume * vp);

374

static void DeleteVolumeFromVByPList_r(Volume * vp);

375

static void VVByPListBeginExclusive_r(struct DiskPartition64 * dp);

376

static void VVByPListEndExclusive_r(struct DiskPartition64 * dp);

377

static void VVByPListWait_r(struct DiskPartition64 * dp);

378

379

/* online salvager */

380

static int VCheckSalvage(Volume * vp);

381

#if defined(SALVSYNC_BUILD_CLIENT1) || defined(FSSYNC_BUILD_CLIENT)

382

static int VScheduleSalvage_r(Volume * vp);

383

#endif

384

385

/* Volume hash table */

386

static void VReorderHash_r(VolumeHashChainHead * head, Volume * pp, Volume * vp);

387

static void VHashBeginExclusive_r(VolumeHashChainHead * head);

388

static void VHashEndExclusive_r(VolumeHashChainHead * head);

389

static void VHashWait_r(VolumeHashChainHead * head);

390

391

/* shutdown */

392

static int ShutdownVByPForPass_r(struct DiskPartition64 * dp, int pass);

393

static int ShutdownVolumeWalk_r(struct DiskPartition64 * dp, int pass,

394

struct rx_queue ** idx);

395

static void ShutdownController(vshutdown_thread_t * params);

396

static void ShutdownCreateSchedule(vshutdown_thread_t * params);

397

398

/* VLRU */

399

static void VLRU_ComputeConstants(void);

400

static void VInitVLRU(void);

401

static void VLRU_Init_Node_r(Volume * vp);

402

static void VLRU_Add_r(Volume * vp);

403

static void VLRU_Delete_r(Volume * vp);

404

static void VLRU_UpdateAccess_r(Volume * vp);

405

static void * VLRU_ScannerThread(void * args);

406

static void VLRU_Scan_r(int idx);

407

static void VLRU_Promote_r(int idx);

408

static void VLRU_Demote_r(int idx);

409

static void VLRU_SwitchQueues(Volume * vp, int new_idx, int append);

410

411

/* soft detach */

412

static int VCheckSoftDetach(Volume * vp, afs_uint32 thresh);

413

static int VCheckSoftDetachCandidate(Volume * vp, afs_uint32 thresh);

414

static int VSoftDetachVolume_r(Volume * vp, afs_uint32 thresh);

415

416

417

pthread_key_t VThread_key;

418

VThreadOptions_t VThread_defaults = {

419

0 /**< allow salvsync */

420

};

421

#endif /* AFS_DEMAND_ATTACH_FS */

422

423

424

struct Lock vol_listLock; /* Lock obtained when listing volumes:

425

* prevents a volume from being missed

426

* if the volume is attached during a

427

* list volumes */

428

429

430

/* Common message used when the volume goes off line */

431

char *VSalvageMessage =

432

"Files in this volume are currently unavailable; call operations";

433

434

int VInit; /* 0 - uninitialized,

435

* 1 - initialized but not all volumes have been attached,

436

* 2 - initialized and all volumes have been attached,

437

* 3 - initialized, all volumes have been attached, and

438

* VConnectFS() has completed. */

439

440

static int vinit_attach_abort = 0;

441

442

bit32 VolumeCacheCheck; /* Incremented everytime a volume goes on line--

443

* used to stamp volume headers and in-core

444

* vnodes. When the volume goes on-line the

445

* vnode will be invalidated

446

* access only with VOL_LOCK held */

447

448

449

450

451

/***************************************************/

452

/* Startup routines */

453

/***************************************************/

454

455

#if defined(FAST_RESTART) && defined(AFS_DEMAND_ATTACH_FS1)

456

# error FAST_RESTART and DAFS are incompatible. For the DAFS equivalent \

457

of FAST_RESTART, use the -unsafe-nosalvage fileserver argument

458

#endif

459

460

/**

461

* assign default values to a VolumePackageOptions struct.

462

463

* Always call this on a VolumePackageOptions struct first, then set any

464

* specific options you want, then call VInitVolumePackage2.

465

466

* @param[in] pt caller's program type

467

* @param[out] opts volume package options

468

469

void

470

VOptDefaults(ProgramType pt, VolumePackageOptions *opts)

471

{

472

opts->nLargeVnodes = opts->nSmallVnodes = 5;

473

opts->volcache = 0;

474

475

opts->canScheduleSalvage = 0;

476

opts->canUseFSSYNC = 0;

477

opts->canUseSALVSYNC = 0;

478

479

opts->interrupt_rxcall = NULL((void *)0);

480

opts->offline_timeout = -1;

481

opts->offline_shutdown_timeout = -1;

482

483

#ifdef FAST_RESTART

484

opts->unsafe_attach = 1;

485

#else /* !FAST_RESTART */

486

opts->unsafe_attach = 0;

487

#endif /* !FAST_RESTART */

488

489

switch (pt) {

490

case fileServer:

491

opts->canScheduleSalvage = 1;

492

opts->canUseSALVSYNC = 1;

493

break;

494

495

case salvageServer:

496

opts->canUseFSSYNC = 1;

497

break;

498

499

case volumeServer:

500

opts->nLargeVnodes = 0;

501

opts->nSmallVnodes = 0;

502

503

opts->canScheduleSalvage = 1;

504

opts->canUseFSSYNC = 1;

505

break;

506

507

default:

508

/* noop */

509

break;

510

}

511

}

512

513

/**

514

* Set VInit to a certain value, and signal waiters.

515

516

* @param[in] value the value to set VInit to

517

518

* @pre VOL_LOCK held

519

520

static void

521

VSetVInit_r(int value)

522

{

523

VInit = value;

524

CV_BROADCAST(&vol_vinit_cond)(void)((pthread_cond_broadcast(&vol_vinit_cond) == 0) || (
osi_AssertFailU("pthread_cond_broadcast(&vol_vinit_cond) == 0"
, "./../vol/volume.c", 524), 0));

525

}

526

527

static_inlinestatic inline void

528

VLogOfflineTimeout(const char *type, afs_int32 timeout)

529

{

530

if (timeout < 0) {

531

return;

532

}

533

if (timeout == 0) {

534

Log("VInitVolumePackage: Interrupting clients accessing %s "

535

"immediately\n", type);

536

} else {

537

Log("VInitVolumePackage: Interrupting clients accessing %s "

538

"after %ld second%s\n", type, (long)timeout, timeout==1?"":"s");

539

}

540

}

541

542

int

543

VInitVolumePackage2(ProgramType pt, VolumePackageOptions * opts)

544

{

545

int errors = 0; /* Number of errors while finding vice partitions. */

546

547

programType = pt;

548

vol_opts = *opts;

549

550

#ifndef AFS_PTHREAD_ENV1

551

if (opts->offline_timeout != -1 || opts->offline_shutdown_timeout != -1) {

552

Log("VInitVolumePackage: offline_timeout and/or "

553

"offline_shutdown_timeout was specified, but the volume package "

554

"does not support these for LWP builds\n");

555

return -1;

556

}

557

#endif

558

VLogOfflineTimeout("volumes going offline", opts->offline_timeout);

559

VLogOfflineTimeout("volumes going offline during shutdown",

560

opts->offline_shutdown_timeout);

561

562

memset(&VStats, 0, sizeof(VStats));

563

VStats.hdr_cache_size = 200;

564

565

VInitPartitionPackage();

566

VInitVolumeHash();

567

#ifdef AFS_DEMAND_ATTACH_FS1

568

if (programType == fileServer) {

569

VInitVLRU();

570

} else {

571

VLRU_SetOptions(VLRU_SET_ENABLED4, 0);

572

}

573

osi_Assert(pthread_key_create(&VThread_key, NULL) == 0)(void)((pthread_key_create(&VThread_key, ((void *)0)) == 0
) || (osi_AssertFailU("pthread_key_create(&VThread_key, NULL) == 0"
, "./../vol/volume.c", 573), 0));

574

#endif

575

576

MUTEX_INIT(&vol_glock_mutex, "vol glock", MUTEX_DEFAULT, 0)(void)((pthread_mutex_init(&vol_glock_mutex, ((void *)0))
== 0) || (osi_AssertFailU("pthread_mutex_init(&vol_glock_mutex, NULL) == 0"
, "./../vol/volume.c", 576), 0));

577

MUTEX_INIT(&vol_trans_mutex, "vol trans", MUTEX_DEFAULT, 0)(void)((pthread_mutex_init(&vol_trans_mutex, ((void *)0))
== 0) || (osi_AssertFailU("pthread_mutex_init(&vol_trans_mutex, NULL) == 0"
, "./../vol/volume.c", 577), 0));

578

CV_INIT(&vol_put_volume_cond, "vol put", CV_DEFAULT, 0)(void)((pthread_cond_init(&vol_put_volume_cond, ((void *)
0)) == 0) || (osi_AssertFailU("pthread_cond_init(&vol_put_volume_cond, NULL) == 0"
, "./../vol/volume.c", 578), 0));

579

CV_INIT(&vol_sleep_cond, "vol sleep", CV_DEFAULT, 0)(void)((pthread_cond_init(&vol_sleep_cond, ((void *)0)) ==
0) || (osi_AssertFailU("pthread_cond_init(&vol_sleep_cond, NULL) == 0"
, "./../vol/volume.c", 579), 0));

580

CV_INIT(&vol_init_attach_cond, "vol init attach", CV_DEFAULT, 0)(void)((pthread_cond_init(&vol_init_attach_cond, ((void *
)0)) == 0) || (osi_AssertFailU("pthread_cond_init(&vol_init_attach_cond, NULL) == 0"
, "./../vol/volume.c", 580), 0));

581

CV_INIT(&vol_vinit_cond, "vol init", CV_DEFAULT, 0)(void)((pthread_cond_init(&vol_vinit_cond, ((void *)0)) ==
0) || (osi_AssertFailU("pthread_cond_init(&vol_vinit_cond, NULL) == 0"
, "./../vol/volume.c", 581), 0));

582

#ifndef AFS_PTHREAD_ENV1

583

IOMGR_Initialize();

584

#endif /* AFS_PTHREAD_ENV */

585

Lock_Init(&vol_listLock);

586

587

srandom(time(0)); /* For VGetVolumeInfo */

588

589

#ifdef AFS_DEMAND_ATTACH_FS1

590

MUTEX_INIT(&vol_salvsync_mutex, "salvsync", MUTEX_DEFAULT, 0)(void)((pthread_mutex_init(&vol_salvsync_mutex, ((void *)
0)) == 0) || (osi_AssertFailU("pthread_mutex_init(&vol_salvsync_mutex, NULL) == 0"
, "./../vol/volume.c", 590), 0));

591

#endif /* AFS_DEMAND_ATTACH_FS */

592

593

/* Ok, we have done enough initialization that fileserver can

594

* start accepting calls, even though the volumes may not be

595

* available just yet.

596

597

VInit = 1;

598

599

#if defined(AFS_DEMAND_ATTACH_FS1) && defined(SALVSYNC_BUILD_SERVER)

600

if (programType == salvageServer) {

601

SALVSYNC_salvInit();

602

}

603

#endif /* AFS_DEMAND_ATTACH_FS */

604

#ifdef FSSYNC_BUILD_SERVER1

605

if (programType == fileServer) {

606

FSYNC_fsInit();

607

}

608

#endif

609

#if defined(AFS_DEMAND_ATTACH_FS1) && defined(SALVSYNC_BUILD_CLIENT1)

610

if (VCanUseSALVSYNC()) {

611

/* establish a connection to the salvager at this point */

612

osi_Assert(VConnectSALV() != 0)(void)((VConnectSALV() != 0) || (osi_AssertFailU("VConnectSALV() != 0"
, "./../vol/volume.c", 612), 0));

613

}

614

#endif /* AFS_DEMAND_ATTACH_FS */

615

616

if (opts->volcache > VStats.hdr_cache_size)

617

VStats.hdr_cache_size = opts->volcache;

618

VInitVolumeHeaderCache(VStats.hdr_cache_size);

619

620

VInitVnodes(vLarge0, opts->nLargeVnodes);

621

VInitVnodes(vSmall1, opts->nSmallVnodes);

622

623

624

errors = VAttachPartitions();

625

if (errors)

626

return -1;

627

628

if (programType != fileServer) {

629

errors = VInitAttachVolumes(programType);

630

if (errors) {

631

return -1;

632

}

633

}

634

635

#ifdef FSSYNC_BUILD_CLIENT

636

if (VCanUseFSSYNC()) {

637

if (!VConnectFS()) {

638

#ifdef AFS_DEMAND_ATTACH_FS1

639

if (programType == salvageServer) {

640

Log("Unable to connect to file server; aborted\n");

641

exit(1);

642

}

643

#endif /* AFS_DEMAND_ATTACH_FS */

644

Log("Unable to connect to file server; will retry at need\n");

645

}

646

}

647

#endif /* FSSYNC_BUILD_CLIENT */

648

return 0;

649

}

650

651

652

#if !defined(AFS_PTHREAD_ENV1)

653

/**

654

* Attach volumes in vice partitions

655

656

* @param[in] pt calling program type

657

658

* @return 0

659

* @note This is the original, non-threaded version of attach parititions.

660

661

* @post VInit state is 2

662

663

int

664

VInitAttachVolumes(ProgramType pt)

665

{

666

osi_Assert(VInit==1)(void)((VInit==1) || (osi_AssertFailU("VInit==1", "./../vol/volume.c"
, 666), 0));

667

if (pt == fileServer) {

668

struct DiskPartition64 *diskP;

669

/* Attach all the volumes in this partition */

670

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

671

int nAttached = 0, nUnattached = 0;

672

osi_Assert(VAttachVolumesByPartition(diskP, &nAttached, &nUnattached) == 0)(void)((VAttachVolumesByPartition(diskP, &nAttached, &
nUnattached) == 0) || (osi_AssertFailU("VAttachVolumesByPartition(diskP, &nAttached, &nUnattached) == 0"
, "./../vol/volume.c", 672), 0));

673

}

674

}

675

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 675), 0));

676

VSetVInit_r(2); /* Initialized, and all volumes have been attached */

677

LWP_NoYieldSignal(VInitAttachVolumes);

678

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 678), 0));

679

return 0;

680

}

681

#endif /* !AFS_PTHREAD_ENV */

682

683

#if defined(AFS_PTHREAD_ENV1) && !defined(AFS_DEMAND_ATTACH_FS1)

684

/**

685

* Attach volumes in vice partitions

686

687

* @param[in] pt calling program type

688

689

* @return 0

690

* @note Threaded version of attach parititions.

691

692

* @post VInit state is 2

693

694

int

695

VInitAttachVolumes(ProgramType pt)

696

{

697

osi_Assert(VInit==1)(void)((VInit==1) || (osi_AssertFailU("VInit==1", "./../vol/volume.c"
, 697), 0));

698

if (pt == fileServer) {

699

struct DiskPartition64 *diskP;

700

struct vinitvolumepackage_thread_t params;

701

struct diskpartition_queue_t * dpq;

702

int i, threads, parts;

703

pthread_t tid;

704

pthread_attr_t attrs;

705

706

CV_INIT(&params.thread_done_cv, "thread done", CV_DEFAULT, 0)(void)((pthread_cond_init(&params.thread_done_cv, ((void *
)0)) == 0) || (osi_AssertFailU("pthread_cond_init(&params.thread_done_cv, NULL) == 0"
, "./../vol/volume.c", 706), 0));

707

queue_Init(&params)(((struct rx_queue *)(&params)))->prev = (((struct rx_queue
*)(&params)))->next = (((struct rx_queue *)(&params
)));

708

params.n_threads_complete = 0;

709

710

/* create partition work queue */

711

for (parts=0, diskP = DiskPartitionList; diskP; diskP = diskP->next, parts++) {

712

dpq = (diskpartition_queue_t *) malloc(sizeof(struct diskpartition_queue_t));

713

osi_Assert(dpq != NULL)(void)((dpq != ((void *)0)) || (osi_AssertFailU("dpq != NULL"
, "./../vol/volume.c", 713), 0));

714

dpq->diskP = diskP;

715

queue_Append(&params,dpq)(((((struct rx_queue *)(dpq))->prev=((struct rx_queue *)(&
params))->prev)->next=((struct rx_queue *)(dpq)))->next
=((struct rx_queue *)(&params)), ((struct rx_queue *)(&
params))->prev=((struct rx_queue *)(dpq)));

716

}

717

718

threads = MIN(parts, vol_attach_threads)(((parts)<(vol_attach_threads))?(parts):(vol_attach_threads
));

719

720

if (threads > 1) {

721

/* spawn off a bunch of initialization threads */

722

osi_Assert(pthread_attr_init(&attrs) == 0)(void)((pthread_attr_init(&attrs) == 0) || (osi_AssertFailU
("pthread_attr_init(&attrs) == 0", "./../vol/volume.c", 722
), 0));

723

osi_Assert(pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED) == 0)(void)((pthread_attr_setdetachstate(&attrs, 0x1) == 0) ||
(osi_AssertFailU("pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED) == 0"
, "./../vol/volume.c", 723), 0));

724

725

Log("VInitVolumePackage: beginning parallel fileserver startup\n");

726

Log("VInitVolumePackage: using %d threads to attach volumes on %d partitions\n",

727

threads, parts);

728

729

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 729), 0));

730

for (i=0; i < threads; i++) {

731

AFS_SIGSET_DECLsigset_t i_tset, i_oset;

732

AFS_SIGSET_CLEAR()do { int b; sigfillset(&i_tset); sigdelset(&i_tset, 11
); sigdelset(&i_tset, 10); sigdelset(&i_tset, 4); sigdelset
(&i_tset, 5); sigdelset(&i_tset, 6); sigdelset(&i_tset
, 8); b = (pthread_sigmask(1, &i_tset, &i_oset) == 0)
; do{if (!(b)) AssertionFailed("./../vol/volume.c", 732);}while
(0); } while (0);

733

osi_Assert(pthread_create(void)((pthread_create (&tid, &attrs, &VInitVolumePackageThread
, &params) == 0) || (osi_AssertFailU("pthread_create (&tid, &attrs, &VInitVolumePackageThread, &params) == 0"
, "./../vol/volume.c", 735), 0))

734

(&tid, &attrs, &VInitVolumePackageThread,(void)((pthread_create (&tid, &attrs, &VInitVolumePackageThread
, &params) == 0) || (osi_AssertFailU("pthread_create (&tid, &attrs, &VInitVolumePackageThread, &params) == 0"
, "./../vol/volume.c", 735), 0))

735

&params) == 0)(void)((pthread_create (&tid, &attrs, &VInitVolumePackageThread
, &params) == 0) || (osi_AssertFailU("pthread_create (&tid, &attrs, &VInitVolumePackageThread, &params) == 0"
, "./../vol/volume.c", 735), 0));

736

AFS_SIGSET_RESTORE()do { int b = (pthread_sigmask(3, &i_oset, ((void *)0)) ==
0); do{if (!(b)) AssertionFailed("./../vol/volume.c", 736);}
while(0); } while (0);

737

}

738

739

while(params.n_threads_complete < threads) {

740

VOL_CV_WAIT(&params.thread_done_cv)(void)((pthread_cond_wait((&params.thread_done_cv), &
vol_glock_mutex) == 0) || (osi_AssertFailU("pthread_cond_wait((&params.thread_done_cv), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 740), 0));

741

}

742

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 742), 0));

743

744

osi_Assert(pthread_attr_destroy(&attrs) == 0)(void)((pthread_attr_destroy(&attrs) == 0) || (osi_AssertFailU
("pthread_attr_destroy(&attrs) == 0", "./../vol/volume.c"
, 744), 0));

745

} else {

746

/* if we're only going to run one init thread, don't bother creating

747

* another LWP */

748

Log("VInitVolumePackage: beginning single-threaded fileserver startup\n");

749

Log("VInitVolumePackage: using 1 thread to attach volumes on %d partition(s)\n",

750

parts);

751

752

VInitVolumePackageThread(&params);

753

}

754

755

CV_DESTROY(&params.thread_done_cv)(void)((pthread_cond_destroy(&params.thread_done_cv) == 0
) || (osi_AssertFailU("pthread_cond_destroy(&params.thread_done_cv) == 0"
, "./../vol/volume.c", 755), 0));

756

}

757

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 757), 0));

758

VSetVInit_r(2); /* Initialized, and all volumes have been attached */

759

CV_BROADCAST(&vol_init_attach_cond)(void)((pthread_cond_broadcast(&vol_init_attach_cond) == 0
) || (osi_AssertFailU("pthread_cond_broadcast(&vol_init_attach_cond) == 0"
, "./../vol/volume.c", 759), 0));

760

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 760), 0));

761

return 0;

762

}

763

764

static void *

765

VInitVolumePackageThread(void * args) {

766

767

struct DiskPartition64 *diskP;

768

struct vinitvolumepackage_thread_t * params;

769

struct diskpartition_queue_t * dpq;

770

771

params = (vinitvolumepackage_thread_t *) args;

772

773

774

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 774), 0));

775

/* Attach all the volumes in this partition */

776

while (queue_IsNotEmpty(params)(((struct rx_queue *)(params))->next != ((struct rx_queue *
)(params)))) {

777

int nAttached = 0, nUnattached = 0;

778

779

if (vinit_attach_abort) {

780

Log("Aborting initialization\n");

781

goto done;

782

}

783

784

dpq = queue_First(params,diskpartition_queue_t)((struct diskpartition_queue_t *)((struct rx_queue *)(params)
)->next);

785

queue_Remove(dpq)(((((struct rx_queue *)(dpq))->prev->next=((struct rx_queue
*)(dpq))->next)->prev=((struct rx_queue *)(dpq))->prev
), ((struct rx_queue *)(dpq))->next = 0);

786

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 786), 0));

787

diskP = dpq->diskP;

788

free(dpq);

789

790

791

792

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 792), 0));

793

}

794

795

done:

796

params->n_threads_complete++;

797

CV_SIGNAL(&params->thread_done_cv)(void)((pthread_cond_signal(&params->thread_done_cv) ==
0) || (osi_AssertFailU("pthread_cond_signal(&params->thread_done_cv) == 0"
, "./../vol/volume.c", 797), 0));

798

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 798), 0));

799

return NULL((void *)0);

800

}

801

#endif /* AFS_PTHREAD_ENV && !AFS_DEMAND_ATTACH_FS */

802

803

#if defined(AFS_DEMAND_ATTACH_FS1)

804

/**

805

* Attach volumes in vice partitions

806

807

* @param[in] pt calling program type

808

809

* @return 0

810

* @note Threaded version of attach partitions.

811

812

* @post VInit state is 2

813

814

int

815

VInitAttachVolumes(ProgramType pt)

816

{

817

osi_Assert(VInit==1)(void)((VInit==1) || (osi_AssertFailU("VInit==1", "./../vol/volume.c"
, 817), 0));

818

if (pt == fileServer) {

819

820

struct DiskPartition64 *diskP;

821

struct partition_queue pq;

822

struct volume_init_queue vq;

823

824

int i, threads, parts;

825

pthread_t tid;

826

pthread_attr_t attrs;

827

828

/* create partition work queue */

829

queue_Init(&pq)(((struct rx_queue *)(&pq)))->prev = (((struct rx_queue
*)(&pq)))->next = (((struct rx_queue *)(&pq)));

830

CV_INIT(&(pq.cv), "partq", CV_DEFAULT, 0)(void)((pthread_cond_init(&(pq.cv), ((void *)0)) == 0) ||
(osi_AssertFailU("pthread_cond_init(&(pq.cv), NULL) == 0"
, "./../vol/volume.c", 830), 0));

831

MUTEX_INIT(&(pq.mutex), "partq", MUTEX_DEFAULT, 0)(void)((pthread_mutex_init(&(pq.mutex), ((void *)0)) == 0
) || (osi_AssertFailU("pthread_mutex_init(&(pq.mutex), NULL) == 0"
, "./../vol/volume.c", 831), 0));

832

for (parts = 0, diskP = DiskPartitionList; diskP; diskP = diskP->next, parts++) {

833

struct diskpartition_queue_t *dp;

834

dp = (struct diskpartition_queue_t*)malloc(sizeof(struct diskpartition_queue_t));

835

osi_Assert(dp != NULL)(void)((dp != ((void *)0)) || (osi_AssertFailU("dp != NULL", "./../vol/volume.c"
, 835), 0));

836

dp->diskP = diskP;

837

queue_Append(&pq, dp)(((((struct rx_queue *)(dp))->prev=((struct rx_queue *)(&
pq))->prev)->next=((struct rx_queue *)(dp)))->next=(
(struct rx_queue *)(&pq)), ((struct rx_queue *)(&pq))
->prev=((struct rx_queue *)(dp)));

838

}

839

840

/* number of worker threads; at least one, not to exceed the number of partitions */

841

threads = MIN(parts, vol_attach_threads)(((parts)<(vol_attach_threads))?(parts):(vol_attach_threads
));

842

843

/* create volume work queue */

844

queue_Init(&vq)(((struct rx_queue *)(&vq)))->prev = (((struct rx_queue
*)(&vq)))->next = (((struct rx_queue *)(&vq)));

845

CV_INIT(&(vq.cv), "volq", CV_DEFAULT, 0)(void)((pthread_cond_init(&(vq.cv), ((void *)0)) == 0) ||
(osi_AssertFailU("pthread_cond_init(&(vq.cv), NULL) == 0"
, "./../vol/volume.c", 845), 0));

846

MUTEX_INIT(&(vq.mutex), "volq", MUTEX_DEFAULT, 0)(void)((pthread_mutex_init(&(vq.mutex), ((void *)0)) == 0
) || (osi_AssertFailU("pthread_mutex_init(&(vq.mutex), NULL) == 0"
, "./../vol/volume.c", 846), 0));

847

848

osi_Assert(pthread_attr_init(&attrs) == 0)(void)((pthread_attr_init(&attrs) == 0) || (osi_AssertFailU
("pthread_attr_init(&attrs) == 0", "./../vol/volume.c", 848
), 0));

849

850

851

Log("VInitVolumePackage: beginning parallel fileserver startup\n");

852

Log("VInitVolumePackage: using %d threads to pre-attach volumes on %d partitions\n",

853

threads, parts);

854

855

/* create threads to scan disk partitions. */

856

for (i=0; i < threads; i++) {

857

struct vinitvolumepackage_thread_param *params;

858

AFS_SIGSET_DECLsigset_t i_tset, i_oset;

859

860

params = (struct vinitvolumepackage_thread_param *)malloc(sizeof(struct vinitvolumepackage_thread_param));

861

osi_Assert(params)(void)((params) || (osi_AssertFailU("params", "./../vol/volume.c"
, 861), 0));

862

params->pq = &pq;

863

params->vq = &vq;

864

params->nthreads = threads;

865

params->thread = i+1;

866

867

868

osi_Assert(pthread_create (&tid, &attrs, &VInitVolumePackageThread, (void*)params) == 0)(void)((pthread_create (&tid, &attrs, &VInitVolumePackageThread
, (void*)params) == 0) || (osi_AssertFailU("pthread_create (&tid, &attrs, &VInitVolumePackageThread, (void*)params) == 0"
, "./../vol/volume.c", 868), 0));

869

AFS_SIGSET_RESTORE()do { int b = (pthread_sigmask(3, &i_oset, ((void *)0)) ==
0); do{if (!(b)) AssertionFailed("./../vol/volume.c", 869);}
while(0); } while (0);

870

}

871

872

VInitPreAttachVolumes(threads, &vq);

873

874

osi_Assert(pthread_attr_destroy(&attrs) == 0)(void)((pthread_attr_destroy(&attrs) == 0) || (osi_AssertFailU
("pthread_attr_destroy(&attrs) == 0", "./../vol/volume.c"
, 874), 0));

875

CV_DESTROY(&pq.cv)(void)((pthread_cond_destroy(&pq.cv) == 0) || (osi_AssertFailU
("pthread_cond_destroy(&pq.cv) == 0", "./../vol/volume.c"
, 875), 0));

876

MUTEX_DESTROY(&pq.mutex)(void)((pthread_mutex_destroy(&pq.mutex) == 0) || (osi_AssertFailU
("pthread_mutex_destroy(&pq.mutex) == 0", "./../vol/volume.c"
, 876), 0));

877

CV_DESTROY(&vq.cv)(void)((pthread_cond_destroy(&vq.cv) == 0) || (osi_AssertFailU
("pthread_cond_destroy(&vq.cv) == 0", "./../vol/volume.c"
, 877), 0));

878

MUTEX_DESTROY(&vq.mutex)(void)((pthread_mutex_destroy(&vq.mutex) == 0) || (osi_AssertFailU
("pthread_mutex_destroy(&vq.mutex) == 0", "./../vol/volume.c"
, 878), 0));

879

}

880

881

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 881), 0));

882

VSetVInit_r(2); /* Initialized, and all volumes have been attached */

883

884

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 884), 0));

885

886

return 0;

887

}

888

889

/**

890

* Volume package initialization worker thread. Scan partitions for volume

891

* header files. Gather batches of volume ids and dispatch them to

892

* the main thread to be preattached. The volume preattachement is done

893

* in the main thread to avoid global volume lock contention.

894

895

static void *

896

VInitVolumePackageThread(void *args)

897

{

898

struct vinitvolumepackage_thread_param *params;

899

struct DiskPartition64 *partition;

900

struct partition_queue *pq;

901

struct volume_init_queue *vq;

902

struct volume_init_batch *vb;

903

904

osi_Assert(args)(void)((args) || (osi_AssertFailU("args", "./../vol/volume.c"
, 904), 0));

905

params = (struct vinitvolumepackage_thread_param *)args;

906

pq = params->pq;

907

vq = params->vq;

908

osi_Assert(pq)(void)((pq) || (osi_AssertFailU("pq", "./../vol/volume.c", 908
), 0));

909

osi_Assert(vq)(void)((vq) || (osi_AssertFailU("vq", "./../vol/volume.c", 909
), 0));

910

911

vb = (struct volume_init_batch*)malloc(sizeof(struct volume_init_batch));

912

osi_Assert(vb)(void)((vb) || (osi_AssertFailU("vb", "./../vol/volume.c", 912
), 0));

913

vb->thread = params->thread;

914

vb->last = 0;

915

vb->size = 0;

916

917

Log("Scanning partitions on thread %d of %d\n", params->thread, params->nthreads);

918

while((partition = VInitNextPartition(pq))) {

919

DIR *dirp;

920

VolId vid;

921

922

Log("Partition %s: pre-attaching volumes\n", partition->name);

923

dirp = opendir(VPartitionPath(partition));

924

if (!dirp) {

925

Log("opendir on Partition %s failed, errno=%d!\n", partition->name, errno(* __error()));

926

continue;

927

}

928

while ((vid = VInitNextVolumeId(dirp))) {

929

Volume *vp = (Volume*)malloc(sizeof(Volume));

930

osi_Assert(vp)(void)((vp) || (osi_AssertFailU("vp", "./../vol/volume.c", 930
), 0));

931

memset(vp, 0, sizeof(Volume));

932

vp->device = partition->device;

933

vp->partition = partition;

934

vp->hashid = vid;

935

queue_Init(&vp->vnode_list)(((struct rx_queue *)(&vp->vnode_list)))->prev = ((
(struct rx_queue *)(&vp->vnode_list)))->next = (((struct
rx_queue *)(&vp->vnode_list)));

936

queue_Init(&vp->rx_call_list)(((struct rx_queue *)(&vp->rx_call_list)))->prev = (
((struct rx_queue *)(&vp->rx_call_list)))->next = (
((struct rx_queue *)(&vp->rx_call_list)));

937

CV_INIT(&V_attachCV(vp), "partattach", CV_DEFAULT, 0)(void)((pthread_cond_init(&((vp)->attach_cv), ((void *
)0)) == 0) || (osi_AssertFailU("pthread_cond_init(&((vp)->attach_cv), NULL) == 0"
, "./../vol/volume.c", 937), 0));

938

939

vb->batch[vb->size++] = vp;

940

if (vb->size == VINIT_BATCH_MAX_SIZE512) {

941

MUTEX_ENTER(&vq->mutex)(void)((pthread_mutex_lock(&vq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vq->mutex) == 0", "./../vol/volume.c"
, 941), 0));

942

queue_Append(vq, vb)(((((struct rx_queue *)(vb))->prev=((struct rx_queue *)(vq
))->prev)->next=((struct rx_queue *)(vb)))->next=((struct
rx_queue *)(vq)), ((struct rx_queue *)(vq))->prev=((struct
rx_queue *)(vb)));

943

CV_BROADCAST(&vq->cv)(void)((pthread_cond_broadcast(&vq->cv) == 0) || (osi_AssertFailU
("pthread_cond_broadcast(&vq->cv) == 0", "./../vol/volume.c"
, 943), 0));

944

MUTEX_EXIT(&vq->mutex)(void)((pthread_mutex_unlock(&vq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_unlock(&vq->mutex) == 0", "./../vol/volume.c"
, 944), 0));

945

946

vb = (struct volume_init_batch*)malloc(sizeof(struct volume_init_batch));

947

osi_Assert(vb)(void)((vb) || (osi_AssertFailU("vb", "./../vol/volume.c", 947
), 0));

948

vb->thread = params->thread;

949

vb->size = 0;

950

vb->last = 0;

951

}

952

}

953

closedir(dirp);

954

}

955

956

vb->last = 1;

957

MUTEX_ENTER(&vq->mutex)(void)((pthread_mutex_lock(&vq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vq->mutex) == 0", "./../vol/volume.c"
, 957), 0));

958

959

CV_BROADCAST(&vq->cv)(void)((pthread_cond_broadcast(&vq->cv) == 0) || (osi_AssertFailU
("pthread_cond_broadcast(&vq->cv) == 0", "./../vol/volume.c"
, 959), 0));

960

MUTEX_EXIT(&vq->mutex)(void)((pthread_mutex_unlock(&vq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_unlock(&vq->mutex) == 0", "./../vol/volume.c"
, 960), 0));

961

962

Log("Partition scan thread %d of %d ended\n", params->thread, params->nthreads);

963

free(params);

964

return NULL((void *)0);

965

}

966

967

/**

968

* Read next element from the pre-populated partition list.

969

970

static struct DiskPartition64*

971

VInitNextPartition(struct partition_queue *pq)

972

{

973

struct DiskPartition64 *partition;

974

struct diskpartition_queue_t *dp; /* queue element */

975

976

if (vinit_attach_abort) {

977

Log("Aborting volume preattach thread.\n");

978

return NULL((void *)0);

979

}

980

981

/* get next partition to scan */

982

MUTEX_ENTER(&pq->mutex)(void)((pthread_mutex_lock(&pq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&pq->mutex) == 0", "./../vol/volume.c"
, 982), 0));

983

if (queue_IsEmpty(pq)(((struct rx_queue *)(pq))->next == ((struct rx_queue *)(pq
)))) {

984

MUTEX_EXIT(&pq->mutex)(void)((pthread_mutex_unlock(&pq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_unlock(&pq->mutex) == 0", "./../vol/volume.c"
, 984), 0));

985

return NULL((void *)0);

986

}

987

dp = queue_First(pq, diskpartition_queue_t)((struct diskpartition_queue_t *)((struct rx_queue *)(pq))->
next);

988

queue_Remove(dp)(((((struct rx_queue *)(dp))->prev->next=((struct rx_queue
*)(dp))->next)->prev=((struct rx_queue *)(dp))->prev
), ((struct rx_queue *)(dp))->next = 0);

989

MUTEX_EXIT(&pq->mutex)(void)((pthread_mutex_unlock(&pq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_unlock(&pq->mutex) == 0", "./../vol/volume.c"
, 989), 0));

990

991

osi_Assert(dp)(void)((dp) || (osi_AssertFailU("dp", "./../vol/volume.c", 991
), 0));

992

osi_Assert(dp->diskP)(void)((dp->diskP) || (osi_AssertFailU("dp->diskP", "./../vol/volume.c"
, 992), 0));

993

994

partition = dp->diskP;

995

free(dp);

996

return partition;

997

}

998

999

/**

1000

* Find next volume id on the partition.

1001

1002

static VolId

1003

VInitNextVolumeId(DIR *dirp)

1004

{

1005

struct dirent *d;

1006

VolId vid = 0;

1007

char *ext;

1008

1009

while((d = readdir(dirp))) {

1010

if (vinit_attach_abort) {

1011

Log("Aborting volume preattach thread.\n");

1012

break;

1013

}

1014

ext = strrchr(d->d_name, '.');

1015

if (d->d_name[0] == 'V' && ext && strcmp(ext, VHDREXT".vol") == 0) {

1016

vid = VolumeNumber(d->d_name);

1017

if (vid) {

1018

break;

1019

}

1020

Log("Warning: bogus volume header file: %s\n", d->d_name);

1021

}

1022

}

1023

return vid;

1024

}

1025

1026

/**

1027

* Preattach volumes in batches to avoid lock contention.

1028

1029

static int

1030

VInitPreAttachVolumes(int nthreads, struct volume_init_queue *vq)

1031

{

1032

struct volume_init_batch *vb;

1033

int i;

1034

1035

while (nthreads) {

1036

/* dequeue next volume */

1037

MUTEX_ENTER(&vq->mutex)(void)((pthread_mutex_lock(&vq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vq->mutex) == 0", "./../vol/volume.c"
, 1037), 0));

1038

if (queue_IsEmpty(vq)(((struct rx_queue *)(vq))->next == ((struct rx_queue *)(vq
)))) {

1039

CV_WAIT(&vq->cv, &vq->mutex)(void)((pthread_cond_wait(&vq->cv, &vq->mutex) ==
0) || (osi_AssertFailU("pthread_cond_wait(&vq->cv, &vq->mutex) == 0"
, "./../vol/volume.c", 1039), 0));

1040

}

1041

vb = queue_First(vq, volume_init_batch)((struct volume_init_batch *)((struct rx_queue *)(vq))->next
);

1042

queue_Remove(vb)(((((struct rx_queue *)(vb))->prev->next=((struct rx_queue
*)(vb))->next)->prev=((struct rx_queue *)(vb))->prev
), ((struct rx_queue *)(vb))->next = 0);

1043

MUTEX_EXIT(&vq->mutex)(void)((pthread_mutex_unlock(&vq->mutex) == 0) || (osi_AssertFailU
("pthread_mutex_unlock(&vq->mutex) == 0", "./../vol/volume.c"
, 1043), 0));

1044

1045

if (vb->size) {

1046

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 1046), 0));

1047

for (i = 0; i<vb->size; i++) {

1048

Volume *vp;

1049

Volume *dup;

1050

Errorbit32 ec = 0;

1051

1052

vp = vb->batch[i];

1053

dup = VLookupVolume_r(&ec, vp->hashid, NULL((void *)0));

1054

if (ec) {

1055

Log("Error looking up volume, code=%d\n", ec);

1056

}

1057

else if (dup) {

1058

Log("Warning: Duplicate volume id %d detected.\n", vp->hashid);

1059

}

1060

else {

1061

/* put pre-attached volume onto the hash table

1062

* and bring it up to the pre-attached state */

1063

AddVolumeToHashTable(vp, vp->hashid);

1064

AddVolumeToVByPList_r(vp);

1065

VLRU_Init_Node_r(vp);

1066

VChangeState_r(vp, VOL_STATE_PREATTACHED);

1067

}

1068

}

1069

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 1069), 0));

1070

}

1071

1072

if (vb->last) {

1073

nthreads--;

1074

}

1075

free(vb);

1076

}

1077

return 0;

1078

}

1079

#endif /* AFS_DEMAND_ATTACH_FS */

1080

1081

#if !defined(AFS_DEMAND_ATTACH_FS1)

1082

1083

* attach all volumes on a given disk partition

1084

1085

static int

1086

VAttachVolumesByPartition(struct DiskPartition64 *diskP, int * nAttached, int * nUnattached)

1087

{

1088

DIR * dirp;

1089

struct dirent * dp;

1090

int ret = 0;

1091

1092

Log("Partition %s: attaching volumes\n", diskP->name);

1093

dirp = opendir(VPartitionPath(diskP));

1094

if (!dirp) {

1095

Log("opendir on Partition %s failed!\n", diskP->name);

1096

return 1;

1097

}

1098

1099

while ((dp = readdir(dirp))) {

1100

char *p;

1101

p = strrchr(dp->d_name, '.');

1102

1103

if (vinit_attach_abort) {

1104

Log("Partition %s: abort attach volumes\n", diskP->name);

1105

goto done;

1106

}

1107

1108

if (p != NULL((void *)0) && strcmp(p, VHDREXT".vol") == 0) {

1109

Errorbit32 error;

1110

Volume *vp;

1111

vp = VAttachVolumeByName(&error, diskP->name, dp->d_name,

1112

V_VOLUPD3);

1113

(*(vp ? nAttached : nUnattached))++;

1114

if (error == VOFFLINE106)

1115

Log("Volume %d stays offline (/vice/offline/%s exists)\n", VolumeNumber(dp->d_name), dp->d_name);

1116

else if (LogLevel >= 5) {

1117

Log("Partition %s: attached volume %d (%s)\n",

1118

diskP->name, VolumeNumber(dp->d_name),

1119

dp->d_name);

1120

}

1121

if (vp) {

1122

VPutVolume(vp);

1123

}

1124

}

1125

}

1126

1127

Log("Partition %s: attached %d volumes; %d volumes not attached\n", diskP->name, *nAttached, *nUnattached);

1128

done:

1129

closedir(dirp);

1130

return ret;

1131

}

1132

#endif /* !AFS_DEMAND_ATTACH_FS */

1133

1134

/***************************************************/

1135

/* Shutdown routines */

1136

/***************************************************/

1137

1138

1139

* demand attach fs

1140

* highly multithreaded volume package shutdown

1141

1142

* with the demand attach fileserver extensions,

1143

* VShutdown has been modified to be multithreaded.

1144

* In order to achieve optimal use of many threads,

1145

* the shutdown code involves one control thread and

1146

* n shutdown worker threads. The control thread

1147

* periodically examines the number of volumes available

1148

* for shutdown on each partition, and produces a worker

1149

* thread allocation schedule. The idea is to eliminate

1150

* redundant scheduling computation on the workers by

1151

* having a single master scheduler.

1152

1153

* The scheduler's objectives are:

1154

* (1) fairness

1155

* each partition with volumes remaining gets allocated

1156

* at least 1 thread (assuming sufficient threads)

1157

* (2) performance

1158

* threads are allocated proportional to the number of

1159

* volumes remaining to be offlined. This ensures that

1160

* the OS I/O scheduler has many requests to elevator

1161

* seek on partitions that will (presumably) take the

1162

* longest amount of time (from now) to finish shutdown

1163

* (3) keep threads busy

1164

* when there are extra threads, they are assigned to

1165

* partitions using a simple round-robin algorithm

1166

1167

* In the future, we may wish to add the ability to adapt

1168

* to the relative performance patterns of each disk

1169

* partition.

1170

1171

1172

* demand attach fs

1173

* multi-step shutdown process

1174

1175

* demand attach shutdown is a four-step process. Each

1176

* shutdown "pass" shuts down increasingly more difficult

1177

* volumes. The main purpose is to achieve better cache

1178

* utilization during shutdown.

1179

1180

* pass 0

1181

* shutdown volumes in the unattached, pre-attached

1182

* and error states

1183

* pass 1

1184

* shutdown attached volumes with cached volume headers

1185

* pass 2

1186

* shutdown all volumes in non-exclusive states

1187

* pass 3

1188

* shutdown all remaining volumes

1189

1190

1191

#ifdef AFS_DEMAND_ATTACH_FS1

1192

1193

void

1194

VShutdown_r(void)

1195

{

1196

int i;

1197

struct DiskPartition64 * diskP;

1198

struct diskpartition_queue_t * dpq;

1199

vshutdown_thread_t params;

1200

pthread_t tid;

1201

pthread_attr_t attrs;

1202

1203

memset(&params, 0, sizeof(vshutdown_thread_t));

1204

1205

if (VInit < 2) {

1206

Log("VShutdown: aborting attach volumes\n");

1207

vinit_attach_abort = 1;

1208

VOL_CV_WAIT(&vol_init_attach_cond)(void)((pthread_cond_wait((&vol_init_attach_cond), &vol_glock_mutex
) == 0) || (osi_AssertFailU("pthread_cond_wait((&vol_init_attach_cond), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 1208), 0));

1209

}

1210

1211

for (params.n_parts=0, diskP = DiskPartitionList;

1212

diskP; diskP = diskP->next, params.n_parts++);

1213

1214

Log("VShutdown: shutting down on-line volumes on %d partition%s...\n",

1215

params.n_parts, params.n_parts > 1 ? "s" : "");

1216

1217

vol_shutting_down = 1;

1218

1219

if (vol_attach_threads > 1) {

1220

/* prepare for parallel shutdown */

1221

params.n_threads = vol_attach_threads;

1222

MUTEX_INIT(&params.lock, "params", MUTEX_DEFAULT, 0)(void)((pthread_mutex_init(&params.lock, ((void *)0)) == 0
) || (osi_AssertFailU("pthread_mutex_init(&params.lock, NULL) == 0"
, "./../vol/volume.c", 1222), 0));

1223

CV_INIT(&params.cv, "params", CV_DEFAULT, 0)(void)((pthread_cond_init(&params.cv, ((void *)0)) == 0) ||
(osi_AssertFailU("pthread_cond_init(&params.cv, NULL) == 0"
, "./../vol/volume.c", 1223), 0));

1224

CV_INIT(&params.master_cv, "params master", CV_DEFAULT, 0)(void)((pthread_cond_init(&params.master_cv, ((void *)0))
== 0) || (osi_AssertFailU("pthread_cond_init(&params.master_cv, NULL) == 0"
, "./../vol/volume.c", 1224), 0));

1225

osi_Assert(pthread_attr_init(&attrs) == 0)(void)((pthread_attr_init(&attrs) == 0) || (osi_AssertFailU
("pthread_attr_init(&attrs) == 0", "./../vol/volume.c", 1225
), 0));

1226

1227

queue_Init(&params)(((struct rx_queue *)(&params)))->prev = (((struct rx_queue
*)(&params)))->next = (((struct rx_queue *)(&params
)));

1228

1229

/* setup the basic partition information structures for

1230

* parallel shutdown */

1231

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1232

/* XXX debug */

1233

struct rx_queue * qp, * nqp;

1234

Volume * vp;

1235

int count = 0;

1236

1237

VVByPListWait_r(diskP);

1238

VVByPListBeginExclusive_r(diskP);

1239

1240

/* XXX debug */

1241

for (queue_Scan(&diskP->vol_list, qp, nqp, rx_queue)(qp) = ((struct rx_queue *)((struct rx_queue *)(&diskP->
vol_list))->next), nqp = ((struct rx_queue *)((struct rx_queue
*)(qp))->next); !(((struct rx_queue *)(&diskP->vol_list
)) == ((struct rx_queue *)(qp))); (qp) = (nqp), nqp = ((struct
rx_queue *)((struct rx_queue *)(qp))->next)) {

1242

vp = (Volume *)((char *)qp - offsetof(Volume, vol_list)__builtin_offsetof(Volume, vol_list));

1243

if (vp->header)

1244

count++;

1245

}

1246

Log("VShutdown: partition %s has %d volumes with attached headers\n",

1247

VPartitionPath(diskP), count);

1248

1249

1250

/* build up the pass 0 shutdown work queue */

1251

dpq = (struct diskpartition_queue_t *) malloc(sizeof(struct diskpartition_queue_t));

1252

osi_Assert(dpq != NULL)(void)((dpq != ((void *)0)) || (osi_AssertFailU("dpq != NULL"
, "./../vol/volume.c", 1252), 0));

1253

dpq->diskP = diskP;

1254

queue_Prepend(&params, dpq)(((((struct rx_queue *)(dpq))->next=((struct rx_queue *)(&
params))->next)->prev=((struct rx_queue *)(dpq)))->prev
=((struct rx_queue *)(&params)), ((struct rx_queue *)(&
params))->next=((struct rx_queue *)(dpq)));

1255

1256

params.part_pass_head[diskP->index] = queue_First(&diskP->vol_list, rx_queue)((struct rx_queue *)((struct rx_queue *)(&diskP->vol_list
))->next);

1257

}

1258

1259

Log("VShutdown: beginning parallel fileserver shutdown\n");

1260

Log("VShutdown: using %d threads to offline volumes on %d partition%s\n",

1261

vol_attach_threads, params.n_parts, params.n_parts > 1 ? "s" : "" );

1262

1263

/* do pass 0 shutdown */

1264

MUTEX_ENTER(&params.lock)(void)((pthread_mutex_lock(&params.lock) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&params.lock) == 0", "./../vol/volume.c"
, 1264), 0));

1265

for (i=0; i < params.n_threads; i++) {

1266

osi_Assert(pthread_create(void)((pthread_create (&tid, &attrs, &VShutdownThread
, &params) == 0) || (osi_AssertFailU("pthread_create (&tid, &attrs, &VShutdownThread, &params) == 0"
, "./../vol/volume.c", 1268), 0))

1267

(&tid, &attrs, &VShutdownThread,(void)((pthread_create (&tid, &attrs, &VShutdownThread
, &params) == 0) || (osi_AssertFailU("pthread_create (&tid, &attrs, &VShutdownThread, &params) == 0"
, "./../vol/volume.c", 1268), 0))

1268

&params) == 0)(void)((pthread_create (&tid, &attrs, &VShutdownThread
, &params) == 0) || (osi_AssertFailU("pthread_create (&tid, &attrs, &VShutdownThread, &params) == 0"
, "./../vol/volume.c", 1268), 0));

1269

}

1270

1271

/* wait for all the pass 0 shutdowns to complete */

1272

while (params.n_threads_complete < params.n_threads) {

1273

CV_WAIT(&params.master_cv, &params.lock)(void)((pthread_cond_wait(&params.master_cv, &params.
lock) == 0) || (osi_AssertFailU("pthread_cond_wait(&params.master_cv, &params.lock) == 0"
, "./../vol/volume.c", 1273), 0));

1274

}

1275

params.n_threads_complete = 0;

1276

params.pass = 1;

1277

CV_BROADCAST(&params.cv)(void)((pthread_cond_broadcast(&params.cv) == 0) || (osi_AssertFailU
("pthread_cond_broadcast(&params.cv) == 0", "./../vol/volume.c"
, 1277), 0));

1278

MUTEX_EXIT(&params.lock)(void)((pthread_mutex_unlock(&params.lock) == 0) || (osi_AssertFailU
("pthread_mutex_unlock(&params.lock) == 0", "./../vol/volume.c"
, 1278), 0));

1279

1280

Log("VShutdown: pass 0 completed using the 1 thread per partition algorithm\n");

1281

Log("VShutdown: starting passes 1 through 3 using finely-granular mp-fast algorithm\n");

1282

1283

/* run the parallel shutdown scheduler. it will drop the glock internally */

1284

ShutdownController(&params);

1285

1286

/* wait for all the workers to finish pass 3 and terminate */

1287

while (params.pass < 4) {

1288

VOL_CV_WAIT(&params.cv)(void)((pthread_cond_wait((&params.cv), &vol_glock_mutex
) == 0) || (osi_AssertFailU("pthread_cond_wait((&params.cv), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 1288), 0));

1289

}

1290

1291

osi_Assert(pthread_attr_destroy(&attrs) == 0)(void)((pthread_attr_destroy(&attrs) == 0) || (osi_AssertFailU
("pthread_attr_destroy(&attrs) == 0", "./../vol/volume.c"
, 1291), 0));

1292

CV_DESTROY(&params.cv)(void)((pthread_cond_destroy(&params.cv) == 0) || (osi_AssertFailU
("pthread_cond_destroy(&params.cv) == 0", "./../vol/volume.c"
, 1292), 0));

1293

CV_DESTROY(&params.master_cv)(void)((pthread_cond_destroy(&params.master_cv) == 0) || (
osi_AssertFailU("pthread_cond_destroy(&params.master_cv) == 0"
, "./../vol/volume.c", 1293), 0));

1294

MUTEX_DESTROY(&params.lock)(void)((pthread_mutex_destroy(&params.lock) == 0) || (osi_AssertFailU
("pthread_mutex_destroy(&params.lock) == 0", "./../vol/volume.c"
, 1294), 0));

1295

1296

/* drop the VByPList exclusive reservations */

1297

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1298

VVByPListEndExclusive_r(diskP);

1299

Log("VShutdown: %s stats : (pass[0]=%d, pass[1]=%d, pass[2]=%d, pass[3]=%d)\n",

1300

VPartitionPath(diskP),

1301

params.stats[0][diskP->index],

1302

params.stats[1][diskP->index],

1303

params.stats[2][diskP->index],

1304

params.stats[3][diskP->index]);

1305

}

1306

1307

Log("VShutdown: shutdown finished using %d threads\n", params.n_threads);

1308

} else {

1309

/* if we're only going to run one shutdown thread, don't bother creating

1310

* another LWP */

1311

Log("VShutdown: beginning single-threaded fileserver shutdown\n");

1312

1313

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1314

VShutdownByPartition_r(diskP);

1315

}

1316

}

1317

1318

Log("VShutdown: complete.\n");

1319

}

1320

1321

#else /* AFS_DEMAND_ATTACH_FS */

1322

1323

void

1324

VShutdown_r(void)

1325

{

1326

int i;

1327

Volume *vp, *np;

1328

afs_int32 code;

1329

1330

if (VInit < 2) {

1331

Log("VShutdown: aborting attach volumes\n");

1332

vinit_attach_abort = 1;

1333

#ifdef AFS_PTHREAD_ENV1

1334

1335

#else

1336

LWP_WaitProcess(VInitAttachVolumes);

1337

#endif /* AFS_PTHREAD_ENV */

1338

}

1339

1340

Log("VShutdown: shutting down on-line volumes...\n");

1341

vol_shutting_down = 1;

1342

for (i = 0; i < VolumeHashTable.Size; i++) {

1343

/* try to hold first volume in the hash table */

1344

for (queue_Scan(&VolumeHashTable.Table[i],vp,np,Volume)(vp) = ((struct Volume *)((struct rx_queue *)(&VolumeHashTable
.Table[i]))->next), np = ((struct Volume *)((struct rx_queue
*)(vp))->next); !(((struct rx_queue *)(&VolumeHashTable
.Table[i])) == ((struct rx_queue *)(vp))); (vp) = (np), np = (
(struct Volume *)((struct rx_queue *)(vp))->next)) {

1345

code = VHold_r(vp);

1346

if (code == 0) {

1347

if (LogLevel >= 5)

1348

Log("VShutdown: Attempting to take volume %u offline.\n",

1349

vp->hashid);

1350

1351

/* next, take the volume offline (drops reference count) */

1352

VOffline_r(vp, "File server was shut down");

1353

}

1354

}

1355

}

1356

Log("VShutdown: complete.\n");

1357

}

1358

#endif /* AFS_DEMAND_ATTACH_FS */

1359

1360

1361

void

1362

VShutdown(void)

1363

{

1364

osi_Assert(VInit>0)(void)((VInit>0) || (osi_AssertFailU("VInit>0", "./../vol/volume.c"
, 1364), 0));

1365

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 1365), 0));

1366

VShutdown_r();

1367

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 1367), 0));

1368

}

1369

1370

/**

1371

* stop new activity (e.g. SALVSYNC) from occurring

1372

1373

* Use this to make the volume package less busy; for example, during

1374

* shutdown. This doesn't actually shutdown/detach anything in the

1375

* volume package, but prevents certain processes from ocurring. For

1376

* example, preventing new SALVSYNC communication in DAFS. In theory, we

1377

* could also use this to prevent new volume attachment, or prevent

1378

* other programs from checking out volumes, etc.

1379

1380

void

1381

VSetTranquil(void)

1382

{

1383

#ifdef AFS_DEMAND_ATTACH_FS1

1384

/* make sure we don't try to contact the salvageserver, since it may

1385

* not be around anymore */

1386

vol_disallow_salvsync = 1;

1387

#endif

1388

}

1389

1390

#ifdef AFS_DEMAND_ATTACH_FS1

1391

1392

* demand attach fs

1393

* shutdown control thread

1394

1395

static void

1396

ShutdownController(vshutdown_thread_t * params)

1397

{

1398

/* XXX debug */

1399

struct DiskPartition64 * diskP;

1400

Device id;

1401

vshutdown_thread_t shadow;

1402

1403

ShutdownCreateSchedule(params);

1404

1405

while ((params->pass < 4) &&

1406

(params->n_threads_complete < params->n_threads)) {

1407

/* recompute schedule once per second */

1408

1409

memcpy(&shadow, params, sizeof(vshutdown_thread_t));

1410

1411

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 1411), 0));

1412

/* XXX debug */

1413

Log("ShutdownController: schedule version=%d, vol_remaining=%d, pass=%d\n",

1414

shadow.schedule_version, shadow.vol_remaining, shadow.pass);

1415

Log("ShutdownController: n_threads_complete=%d, n_parts_done_pass=%d\n",

1416

shadow.n_threads_complete, shadow.n_parts_done_pass);

1417

for (diskP = DiskPartitionList; diskP; diskP=diskP->next) {

1418

id = diskP->index;

1419

Log("ShutdownController: part[%d] : (len=%d, thread_target=%d, done_pass=%d, pass_head=%p)\n",

1420

id,

1421

diskP->vol_list.len,

1422

shadow.part_thread_target[id],

1423

shadow.part_done_pass[id],

1424

shadow.part_pass_head[id]);

1425

}

1426

1427

sleep(1);

1428

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 1428), 0));

1429

1430

ShutdownCreateSchedule(params);

1431

}

1432

}

1433

1434

/* create the shutdown thread work schedule.

1435

* this scheduler tries to implement fairness

1436

* by allocating at least 1 thread to each

1437

* partition with volumes to be shutdown,

1438

* and then it attempts to allocate remaining

1439

* threads based upon the amount of work left

1440

1441

static void

1442

ShutdownCreateSchedule(vshutdown_thread_t * params)

1443

{

1444

struct DiskPartition64 * diskP;

1445

int sum, thr_workload, thr_left;

1446

int part_residue[VOLMAXPARTS255+1];

1447

Device id;

1448

1449

/* compute the total number of outstanding volumes */

1450

sum = 0;

1451

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1452

sum += diskP->vol_list.len;

1453

}

1454

1455

params->schedule_version++;

1456

params->vol_remaining = sum;

1457

1458

if (!sum)

1459

return;

1460

1461

/* compute average per-thread workload */

1462

thr_workload = sum / params->n_threads;

1463

if (sum % params->n_threads)

1464

thr_workload++;

1465

1466

thr_left = params->n_threads;

1467

memset(&part_residue, 0, sizeof(part_residue));

1468

1469

/* for fairness, give every partition with volumes remaining

1470

* at least one thread */

1471

for (diskP = DiskPartitionList; diskP && thr_left; diskP = diskP->next) {

1472

id = diskP->index;

1473

if (diskP->vol_list.len) {

1474

params->part_thread_target[id] = 1;

1475

thr_left--;

1476

} else {

1477

params->part_thread_target[id] = 0;

1478

}

1479

}

1480

1481

if (thr_left && thr_workload) {

1482

/* compute length-weighted workloads */

1483

int delta;

1484

1485

for (diskP = DiskPartitionList; diskP && thr_left; diskP = diskP->next) {

1486

id = diskP->index;

1487

delta = (diskP->vol_list.len / thr_workload) -

1488

params->part_thread_target[id];

1489

if (delta < 0) {

1490

continue;

1491

}

1492

if (delta < thr_left) {

1493

params->part_thread_target[id] += delta;

1494

thr_left -= delta;

1495

} else {

1496

params->part_thread_target[id] += thr_left;

1497

thr_left = 0;

1498

break;

1499

}

1500

}

1501

}

1502

1503

if (thr_left) {

1504

/* try to assign any leftover threads to partitions that

1505

* had volume lengths closer to needing thread_target+1 */

1506

int max_residue, max_id = 0;

1507

1508

/* compute the residues */

1509

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1510

id = diskP->index;

1511

part_residue[id] = diskP->vol_list.len -

1512

(params->part_thread_target[id] * thr_workload);

1513

}

1514

1515

/* now try to allocate remaining threads to partitions with the

1516

* highest residues */

1517

while (thr_left) {

1518

max_residue = 0;

1519

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1520

id = diskP->index;

1521

if (part_residue[id] > max_residue) {

1522

max_residue = part_residue[id];

1523

max_id = id;

1524

}

1525

}

1526

1527

if (!max_residue) {

1528

break;

1529

}

1530

1531

params->part_thread_target[max_id]++;

1532

thr_left--;

1533

part_residue[max_id] = 0;

1534

}

1535

}

1536

1537

if (thr_left) {

1538

/* punt and give any remaining threads equally to each partition */

1539

int alloc;

1540

if (thr_left >= params->n_parts) {

1541

alloc = thr_left / params->n_parts;

1542

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1543

id = diskP->index;

1544

params->part_thread_target[id] += alloc;

1545

thr_left -= alloc;

1546

}

1547

}

1548

1549

/* finish off the last of the threads */

1550

for (diskP = DiskPartitionList; thr_left && diskP; diskP = diskP->next) {

1551

id = diskP->index;

1552

params->part_thread_target[id]++;

1553

thr_left--;

1554

}

1555

}

1556

}

1557

1558

/* worker thread for parallel shutdown */

1559

static void *

1560

VShutdownThread(void * args)

1561

{

1562

vshutdown_thread_t * params;

1563

int found, pass, schedule_version_save, count;

1564

struct DiskPartition64 *diskP;

1565

struct diskpartition_queue_t * dpq;

1566

Device id;

1567

1568

params = (vshutdown_thread_t *) args;

1569

1570

/* acquire the shutdown pass 0 lock */

1571

MUTEX_ENTER(&params->lock)(void)((pthread_mutex_lock(&params->lock) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&params->lock) == 0", "./../vol/volume.c"
, 1571), 0));

1572

1573

/* if there's still pass 0 work to be done,

1574

* get a work entry, and do a pass 0 shutdown */

1575

if (queue_IsNotEmpty(params)(((struct rx_queue *)(params))->next != ((struct rx_queue *
)(params)))) {

1576

dpq = queue_First(params, diskpartition_queue_t)((struct diskpartition_queue_t *)((struct rx_queue *)(params)
)->next);

1577

queue_Remove(dpq)(((((struct rx_queue *)(dpq))->prev->next=((struct rx_queue
*)(dpq))->next)->prev=((struct rx_queue *)(dpq))->prev
), ((struct rx_queue *)(dpq))->next = 0);

1578

MUTEX_EXIT(&params->lock)(void)((pthread_mutex_unlock(&params->lock) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&params->lock) == 0"
, "./../vol/volume.c", 1578), 0));

1579

diskP = dpq->diskP;

1580

free(dpq);

1581

id = diskP->index;

1582

1583

count = 0;

1584

while (ShutdownVolumeWalk_r(diskP, 0, &params->part_pass_head[id]))

1585

count++;

1586

params->stats[0][diskP->index] = count;

1587

MUTEX_ENTER(&params->lock)(void)((pthread_mutex_lock(&params->lock) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&params->lock) == 0", "./../vol/volume.c"
, 1587), 0));

1588

}

1589

1590

params->n_threads_complete++;

1591

if (params->n_threads_complete == params->n_threads) {

1592

/* notify control thread that all workers have completed pass 0 */

1593

CV_SIGNAL(&params->master_cv)(void)((pthread_cond_signal(&params->master_cv) == 0) ||
(osi_AssertFailU("pthread_cond_signal(&params->master_cv) == 0"
, "./../vol/volume.c", 1593), 0));

1594

}

1595

while (params->pass == 0) {

1596

CV_WAIT(&params->cv, &params->lock)(void)((pthread_cond_wait(&params->cv, &params->
lock) == 0) || (osi_AssertFailU("pthread_cond_wait(&params->cv, &params->lock) == 0"
, "./../vol/volume.c", 1596), 0));

1597

}

1598

1599

/* switch locks */

1600

MUTEX_EXIT(&params->lock)(void)((pthread_mutex_unlock(&params->lock) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&params->lock) == 0"
, "./../vol/volume.c", 1600), 0));

1601

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 1601), 0));

1602

1603

pass = params->pass;

1604

osi_Assert(pass > 0)(void)((pass > 0) || (osi_AssertFailU("pass > 0", "./../vol/volume.c"
, 1604), 0));

1605

1606

/* now escalate through the more complicated shutdowns */

1607

while (pass <= 3) {

1608

schedule_version_save = params->schedule_version;

1609

found = 0;

1610

/* find a disk partition to work on */

1611

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1612

id = diskP->index;

1613

if (params->part_thread_target[id] && !params->part_done_pass[id]) {

1614

params->part_thread_target[id]--;

1615

found = 1;

1616

break;

1617

}

1618

}

1619

1620

if (!found) {

1621

/* hmm. for some reason the controller thread couldn't find anything for

1622

* us to do. let's see if there's anything we can do */

1623

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1624

id = diskP->index;

1625

if (diskP->vol_list.len && !params->part_done_pass[id]) {

1626

found = 1;

1627

break;

1628

} else if (!params->part_done_pass[id]) {

1629

params->part_done_pass[id] = 1;

1630

params->n_parts_done_pass++;

1631

if (pass == 3) {

1632

Log("VShutdown: done shutting down volumes on partition %s.\n",

1633

VPartitionPath(diskP));

1634

}

1635

}

1636

}

1637

}

1638

1639

/* do work on this partition until either the controller

1640

* creates a new schedule, or we run out of things to do

1641

* on this partition */

1642

if (found) {

1643

count = 0;

1644

while (!params->part_done_pass[id] &&

1645

(schedule_version_save == params->schedule_version)) {

1646

/* ShutdownVolumeWalk_r will drop the glock internally */

1647

if (!ShutdownVolumeWalk_r(diskP, pass, &params->part_pass_head[id])) {

1648

if (!params->part_done_pass[id]) {

1649

params->part_done_pass[id] = 1;

1650

params->n_parts_done_pass++;

1651

if (pass == 3) {

1652

Log("VShutdown: done shutting down volumes on partition %s.\n",

1653

VPartitionPath(diskP));

1654

}

1655

}

1656

break;

1657

}

1658

count++;

1659

}

1660

1661

params->stats[pass][id] += count;

1662

} else {

1663

/* ok, everyone is done this pass, proceed */

1664

1665

/* barrier lock */

1666

params->n_threads_complete++;

1667

while (params->pass == pass) {

1668

if (params->n_threads_complete == params->n_threads) {

1669

/* we are the last thread to complete, so we will

1670

* reinitialize worker pool state for the next pass */

1671

params->n_threads_complete = 0;

1672

params->n_parts_done_pass = 0;

1673

params->pass++;

1674

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

1675

id = diskP->index;

1676

params->part_done_pass[id] = 0;

1677

params->part_pass_head[id] = queue_First(&diskP->vol_list, rx_queue)((struct rx_queue *)((struct rx_queue *)(&diskP->vol_list
))->next);

1678

}

1679

1680

/* compute a new thread schedule before releasing all the workers */

1681

ShutdownCreateSchedule(params);

1682

1683

/* wake up all the workers */

1684

CV_BROADCAST(&params->cv)(void)((pthread_cond_broadcast(&params->cv) == 0) || (
osi_AssertFailU("pthread_cond_broadcast(&params->cv) == 0"
, "./../vol/volume.c", 1684), 0));

1685

1686

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 1686), 0));

1687

Log("VShutdown: pass %d completed using %d threads on %d partitions\n",

1688

pass, params->n_threads, params->n_parts);

1689

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 1689), 0));

1690

} else {

1691

VOL_CV_WAIT(&params->cv)(void)((pthread_cond_wait((&params->cv), &vol_glock_mutex
) == 0) || (osi_AssertFailU("pthread_cond_wait((&params->cv), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 1691), 0));

1692

}

1693

}

1694

pass = params->pass;

1695

}

1696

1697

/* for fairness */

1698

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 1698), 0));

1699

pthread_yield()sleep(0);

1700

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 1700), 0));

1701

}

1702

1703

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 1703), 0));

1704

1705

return NULL((void *)0);

1706

}

1707

1708

/* shut down all volumes on a given disk partition

1709

1710

* note that this function will not allow mp-fast

1711

* shutdown of a partition */

1712

int

1713

VShutdownByPartition_r(struct DiskPartition64 * dp)

1714

{

1715

int pass;

1716

int pass_stats[4];

1717

int total;

1718

1719

/* wait for other exclusive ops to finish */

1720

VVByPListWait_r(dp);

1721

1722

/* begin exclusive access */

1723

VVByPListBeginExclusive_r(dp);

1724

1725

/* pick the low-hanging fruit first,

1726

* then do the complicated ones last

1727

* (has the advantage of keeping

1728

* in-use volumes up until the bitter end) */

1729

for (pass = 0, total=0; pass < 4; pass++) {

1730

pass_stats[pass] = ShutdownVByPForPass_r(dp, pass);

1731

total += pass_stats[pass];

1732

}

1733

1734

/* end exclusive access */

1735

VVByPListEndExclusive_r(dp);

1736

1737

Log("VShutdownByPartition: shut down %d volumes on %s (pass[0]=%d, pass[1]=%d, pass[2]=%d, pass[3]=%d)\n",

1738

total, VPartitionPath(dp), pass_stats[0], pass_stats[1], pass_stats[2], pass_stats[3]);

1739

1740

return 0;

1741

}

1742

1743

/* internal shutdown functionality

1744

1745

* for multi-pass shutdown:

1746

* 0 to only "shutdown" {pre,un}attached and error state volumes

1747

* 1 to also shutdown attached volumes w/ volume header loaded

1748

* 2 to also shutdown attached volumes w/o volume header loaded

1749

* 3 to also shutdown exclusive state volumes

1750

1751

* caller MUST hold exclusive access on the hash chain

1752

* because we drop vol_glock_mutex internally

1753

1754

* this function is reentrant for passes 1--3

1755

* (e.g. multiple threads can cooperate to

1756

* shutdown a partition mp-fast)

1757

1758

* pass 0 is not scaleable because the volume state data is

1759

* synchronized by vol_glock mutex, and the locking overhead

1760

* is too high to drop the lock long enough to do linked list

1761

* traversal

1762

1763

static int

1764

ShutdownVByPForPass_r(struct DiskPartition64 * dp, int pass)

1765

{

1766

struct rx_queue * q = queue_First(&dp->vol_list, rx_queue)((struct rx_queue *)((struct rx_queue *)(&dp->vol_list
))->next);

1767

int i = 0;

1768

1769

while (ShutdownVolumeWalk_r(dp, pass, &q))

1770

i++;

1771

1772

return i;

1773

}

1774

1775

/* conditionally shutdown one volume on partition dp

1776

* returns 1 if a volume was shutdown in this pass,

1777

* 0 otherwise */

1778

static int

1779

ShutdownVolumeWalk_r(struct DiskPartition64 * dp, int pass,

1780

struct rx_queue ** idx)

1781

{

1782

struct rx_queue *qp, *nqp;

1783

Volume * vp;

1784

1785

qp = *idx;

1786

1787

for (queue_ScanFrom(&dp->vol_list, qp, qp, nqp, rx_queue)(qp) = (struct rx_queue*)(qp), nqp = ((struct rx_queue *)((struct
rx_queue *)(qp))->next); !(((struct rx_queue *)(&dp->
vol_list)) == ((struct rx_queue *)(qp))); (qp) = (nqp), nqp =
((struct rx_queue *)((struct rx_queue *)(qp))->next)) {

1788

vp = (Volume *) (((char *)qp) - offsetof(Volume, vol_list)__builtin_offsetof(Volume, vol_list));

1789

1790

switch (pass) {

1791

case 0:

1792

if ((V_attachState(vp)((vp)->attach_state) != VOL_STATE_UNATTACHED) &&

1793

(V_attachState(vp)((vp)->attach_state) != VOL_STATE_ERROR) &&

1794

(V_attachState(vp)((vp)->attach_state) != VOL_STATE_DELETED) &&

1795

(V_attachState(vp)((vp)->attach_state) != VOL_STATE_PREATTACHED)) {

1796

break;

1797

}

1798

case 1:

1799

if ((V_attachState(vp)((vp)->attach_state) == VOL_STATE_ATTACHED) &&

1800

(vp->header == NULL((void *)0))) {

1801

break;

1802

}

1803

case 2:

1804

if (VIsExclusiveState(V_attachState(vp)((vp)->attach_state))) {

1805

break;

1806

}

1807

case 3:

1808

*idx = nqp;

1809

DeleteVolumeFromVByPList_r(vp);

1810

VShutdownVolume_r(vp);

1811

vp = NULL((void *)0);

1812

return 1;

1813

}

1814

}

1815

1816

return 0;

1817

}

1818

1819

1820

* shutdown a specific volume

1821

1822

/* caller MUST NOT hold a heavyweight ref on vp */

1823

int

1824

VShutdownVolume_r(Volume * vp)

1825

{

1826

int code;

1827

1828

VCreateReservation_r(vp);

1829

1830

if (LogLevel >= 5) {

1831

Log("VShutdownVolume_r: vid=%u, device=%d, state=%hu\n",

1832

vp->hashid, vp->partition->device, V_attachState(vp)((vp)->attach_state));

1833

}

1834

1835

/* wait for other blocking ops to finish */

1836

VWaitExclusiveState_r(vp);

1837

1838

osi_Assert(VIsValidState(V_attachState(vp)))(void)((VIsValidState(((vp)->attach_state))) || (osi_AssertFailU
("VIsValidState(V_attachState(vp))", "./../vol/volume.c", 1838
), 0));

1839

1840

switch(V_attachState(vp)((vp)->attach_state)) {

1841

case VOL_STATE_SALVAGING:

1842

/* Leave salvaging volumes alone. Any in-progress salvages will

1843

* continue working after viced shuts down. This is intentional.

1844

1845

1846

case VOL_STATE_PREATTACHED:

1847

case VOL_STATE_ERROR:

1848

VChangeState_r(vp, VOL_STATE_UNATTACHED);

1849

case VOL_STATE_UNATTACHED:

1850

case VOL_STATE_DELETED:

1851

break;

1852

case VOL_STATE_GOING_OFFLINE:

1853

case VOL_STATE_SHUTTING_DOWN:

1854

case VOL_STATE_ATTACHED:

1855

code = VHold_r(vp);

1856

if (!code) {

1857

if (LogLevel >= 5)

1858

Log("VShutdown: Attempting to take volume %u offline.\n",

1859

vp->hashid);

1860

1861

/* take the volume offline (drops reference count) */

1862

VOffline_r(vp, "File server was shut down");

1863

}

1864

break;

1865

default:

1866

break;

1867

}

1868

1869

VCancelReservation_r(vp);

1870

vp = NULL((void *)0);

1871

return 0;

1872

}

1873

#endif /* AFS_DEMAND_ATTACH_FS */

1874

1875

1876

/***************************************************/

1877

/* Header I/O routines */

1878

/***************************************************/

1879

1880

/* open a descriptor for the inode (h),

1881

* read in an on-disk structure into buffer (to) of size (size),

1882

* verify versionstamp in structure has magic (magic) and

1883

* optionally verify version (version) if (version) is nonzero

1884

1885

static void

1886

ReadHeader(Errorbit32 * ec, IHandle_t * h, char *to, int size, bit32 magic,

1887

bit32 version)

1888

{

1889

struct versionStamp *vsn;

1890

FdHandle_t *fdP;

1891

1892

*ec = 0;

1893

if (h == NULL((void *)0)) {

1894

*ec = VSALVAGE101;

1895

return;

1896

}

1897

1898

fdP = IH_OPEN(h)ih_open(h);

1899

if (fdP == NULL((void *)0)) {

1900

*ec = VSALVAGE101;

1901

return;

1902

}

1903

1904

vsn = (struct versionStamp *)to;

1905

if (FDH_PREAD(fdP, to, size, 0)pread((fdP)->fd_fd, to, size, 0) != size || vsn->magic != magic) {

1906

*ec = VSALVAGE101;

1907

FDH_REALLYCLOSE(fdP)(fd_reallyclose(fdP), (fdP)=((void *)0), 0);

1908

return;

1909

}

1910

FDH_CLOSE(fdP)(fd_close(fdP), (fdP)=((void *)0), 0);

1911

1912

/* Check is conditional, in case caller wants to inspect version himself */

1913

if (version && vsn->version != version) {

1914

*ec = VSALVAGE101;

1915

}

1916

}

1917

1918

void

1919

WriteVolumeHeader_r(Errorbit32 * ec, Volume * vp)

1920

{

1921

IHandle_t *h = V_diskDataHandle(vp)((vp)->diskDataHandle);

1922

FdHandle_t *fdP;

1923

1924

*ec = 0;

1925

1926

fdP = IH_OPEN(h)ih_open(h);

1927

if (fdP == NULL((void *)0)) {

1928

*ec = VSALVAGE101;

1929

return;

1930

}

1931

if (FDH_PWRITE(fdP, (char *)&V_disk(vp), sizeof(V_disk(vp)), 0)pwrite((fdP)->fd_fd, (char *)&((vp)->header->diskstuff
), sizeof(((vp)->header->diskstuff)), 0)

1932

!= sizeof(V_disk(vp)((vp)->header->diskstuff))) {

1933

*ec = VSALVAGE101;

1934

FDH_REALLYCLOSE(fdP)(fd_reallyclose(fdP), (fdP)=((void *)0), 0);

1935

return;

1936

}

1937

FDH_CLOSE(fdP)(fd_close(fdP), (fdP)=((void *)0), 0);

1938

}

1939

1940

/* VolumeHeaderToDisk

1941

* Allows for storing 64 bit inode numbers in on-disk volume header

1942

* file.

1943

1944

/* convert in-memory representation of a volume header to the

1945

* on-disk representation of a volume header */

1946

void

1947

VolumeHeaderToDisk(VolumeDiskHeader_t * dh, VolumeHeader_t * h)

1948

{

1949

1950

memset(dh, 0, sizeof(VolumeDiskHeader_t));

1951

dh->stamp = h->stamp;

1952

dh->id = h->id;

1953

dh->parent = h->parent;

1954

1955

#ifdef AFS_64BIT_IOPS_ENV1

1956

dh->volumeInfo_lo = (afs_int32) h->volumeInfo & 0xffffffff;

1957

dh->volumeInfo_hi = (afs_int32) (h->volumeInfo >> 32) & 0xffffffff;

1958

dh->smallVnodeIndex_lo = (afs_int32) h->smallVnodeIndex & 0xffffffff;

1959

dh->smallVnodeIndex_hi =

1960

(afs_int32) (h->smallVnodeIndex >> 32) & 0xffffffff;

1961

dh->largeVnodeIndex_lo = (afs_int32) h->largeVnodeIndex & 0xffffffff;

1962

dh->largeVnodeIndex_hi =

1963

(afs_int32) (h->largeVnodeIndex >> 32) & 0xffffffff;

1964

dh->linkTable_lo = (afs_int32) h->linkTable & 0xffffffff;

1965

dh->linkTable_hi = (afs_int32) (h->linkTable >> 32) & 0xffffffff;

1966

#else

1967

dh->volumeInfo_lo = h->volumeInfo;

1968

dh->smallVnodeIndex_lo = h->smallVnodeIndex;

1969

dh->largeVnodeIndex_lo = h->largeVnodeIndex;

1970

dh->linkTable_lo = h->linkTable;

1971

#endif

1972

}

1973

1974

/* DiskToVolumeHeader

1975

* Converts an on-disk representation of a volume header to

1976

* the in-memory representation of a volume header.

1977

1978

* Makes the assumption that AFS has *always*

1979

* zero'd the volume header file so that high parts of inode

1980

* numbers are 0 in older (SGI EFS) volume header files.

1981

1982

void

1983

DiskToVolumeHeader(VolumeHeader_t * h, VolumeDiskHeader_t * dh)

1984

{

1985

memset(h, 0, sizeof(VolumeHeader_t));

1986

h->stamp = dh->stamp;

1987

h->id = dh->id;

1988

h->parent = dh->parent;

1989

1990

#ifdef AFS_64BIT_IOPS_ENV1

1991

h->volumeInfo =

1992

(Inode) dh->volumeInfo_lo | ((Inode) dh->volumeInfo_hi << 32);

1993

1994

h->smallVnodeIndex =

1995

(Inode) dh->smallVnodeIndex_lo | ((Inode) dh->

1996

smallVnodeIndex_hi << 32);

1997

1998

h->largeVnodeIndex =

1999

(Inode) dh->largeVnodeIndex_lo | ((Inode) dh->

2000

largeVnodeIndex_hi << 32);

2001

h->linkTable =

2002

(Inode) dh->linkTable_lo | ((Inode) dh->linkTable_hi << 32);

2003

#else

2004

h->volumeInfo = dh->volumeInfo_lo;

2005

h->smallVnodeIndex = dh->smallVnodeIndex_lo;

2006

h->largeVnodeIndex = dh->largeVnodeIndex_lo;

2007

h->linkTable = dh->linkTable_lo;

2008

#endif

2009

}

2010

2011

2012

/***************************************************/

2013

/* Volume Attachment routines */

2014

/***************************************************/

2015

2016

#ifdef AFS_DEMAND_ATTACH_FS1

2017

/**

2018

* pre-attach a volume given its path.

2019

2020

* @param[out] ec outbound error code

2021

* @param[in] partition partition path string

2022

* @param[in] name volume id string

2023

2024

* @return volume object pointer

2025

2026

* @note A pre-attached volume will only have its partition

2027

* and hashid fields initialized. At first call to

2028

* VGetVolume, the volume will be fully attached.

2029

2030

2031

Volume *

2032

VPreAttachVolumeByName(Errorbit32 * ec, char *partition, char *name)

2033

{

2034

Volume * vp;

2035

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 2035), 0));

2036

vp = VPreAttachVolumeByName_r(ec, partition, name);

2037

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2037), 0));

2038

return vp;

2039

}

2040

2041

/**

2042

* pre-attach a volume given its path.

2043

2044

* @param[out] ec outbound error code

2045

* @param[in] partition path to vice partition

2046

* @param[in] name volume id string

2047

2048

* @return volume object pointer

2049

2050

* @pre VOL_LOCK held

2051

2052

* @internal volume package internal use only.

2053

2054

Volume *

2055

VPreAttachVolumeByName_r(Errorbit32 * ec, char *partition, char *name)

2056

{

2057

return VPreAttachVolumeById_r(ec,

2058

partition,

2059

VolumeNumber(name));

2060

}

2061

2062

/**

2063

* pre-attach a volume given its path and numeric volume id.

2064

2065

* @param[out] ec error code return

2066

* @param[in] partition path to vice partition

2067

* @param[in] volumeId numeric volume id

2068

2069

* @return volume object pointer

2070

2071

* @pre VOL_LOCK held

2072

2073

* @internal volume package internal use only.

2074

2075

Volume *

2076

VPreAttachVolumeById_r(Errorbit32 * ec,

2077

char * partition,

2078

VolId volumeId)

2079

{

2080

Volume *vp;

2081

struct DiskPartition64 *partp;

2082

2083

*ec = 0;

2084

2085

osi_Assert(programType == fileServer)(void)((programType == fileServer) || (osi_AssertFailU("programType == fileServer"
, "./../vol/volume.c", 2085), 0));

2086

2087

if (!(partp = VGetPartition_r(partition, 0))) {

2088

*ec = VNOVOL103;

2089

Log("VPreAttachVolumeById_r: Error getting partition (%s)\n", partition);

2090

return NULL((void *)0);

2091

}

2092

2093

vp = VLookupVolume_r(ec, volumeId, NULL((void *)0));

2094

if (*ec) {

2095

return NULL((void *)0);

2096

}

2097

2098

return VPreAttachVolumeByVp_r(ec, partp, vp, volumeId);

2099

}

2100

2101

/**

2102

* preattach a volume.

2103

2104

* @param[out] ec outbound error code

2105

* @param[in] partp pointer to partition object

2106

* @param[in] vp pointer to volume object

2107

* @param[in] vid volume id

2108

2109

* @return volume object pointer

2110

2111

* @pre VOL_LOCK is held.

2112

2113

* @warning Returned volume object pointer does not have to

2114

* equal the pointer passed in as argument vp. There

2115

* are potential race conditions which can result in

2116

* the pointers having different values. It is up to

2117

* the caller to make sure that references are handled

2118

* properly in this case.

2119

2120

* @note If there is already a volume object registered with

2121

* the same volume id, its pointer MUST be passed as

2122

* argument vp. Failure to do so will result in a silent

2123

* failure to preattach.

2124

2125

* @internal volume package internal use only.

2126

2127

Volume *

2128

VPreAttachVolumeByVp_r(Errorbit32 * ec,

2129

struct DiskPartition64 * partp,

2130

Volume * vp,

2131

VolId vid)

2132

{

2133

Volume *nvp = NULL((void *)0);

2134

2135

*ec = 0;

2136

2137

/* check to see if pre-attach already happened */

2138

if (vp &&

2139

(V_attachState(vp)((vp)->attach_state) != VOL_STATE_UNATTACHED) &&

2140

(V_attachState(vp)((vp)->attach_state) != VOL_STATE_DELETED) &&

2141

(V_attachState(vp)((vp)->attach_state) != VOL_STATE_PREATTACHED) &&

2142

!VIsErrorState(V_attachState(vp)((vp)->attach_state))) {

2143

2144

* pre-attach is a no-op in all but the following cases:

2145

2146

* - volume is unattached

2147

* - volume is in an error state

2148

* - volume is pre-attached

2149

2150

Log("VPreattachVolumeByVp_r: volume %u not in quiescent state\n", vid);

2151

goto done;

2152

} else if (vp) {

2153

/* we're re-attaching a volume; clear out some old state */

2154

memset(&vp->salvage, 0, sizeof(struct VolumeOnlineSalvage));

2155

2156

if (V_partition(vp)((vp)->partition) != partp) {

2157

/* XXX potential race */

2158

DeleteVolumeFromVByPList_r(vp);

2159

}

2160

} else {

2161

/* if we need to allocate a new Volume struct,

2162

* go ahead and drop the vol glock, otherwise

2163

* do the basic setup synchronised, as it's

2164

* probably not worth dropping the lock */

2165

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2165), 0));

2166

2167

/* allocate the volume structure */

2168

vp = nvp = (Volume *) malloc(sizeof(Volume));

2169

osi_Assert(vp != NULL)(void)((vp != ((void *)0)) || (osi_AssertFailU("vp != NULL", "./../vol/volume.c"
, 2169), 0));

2170

memset(vp, 0, sizeof(Volume));

2171

queue_Init(&vp->vnode_list)(((struct rx_queue *)(&vp->vnode_list)))->prev = ((
(struct rx_queue *)(&vp->vnode_list)))->next = (((struct
rx_queue *)(&vp->vnode_list)));

2172

queue_Init(&vp->rx_call_list)(((struct rx_queue *)(&vp->rx_call_list)))->prev = (
((struct rx_queue *)(&vp->rx_call_list)))->next = (
((struct rx_queue *)(&vp->rx_call_list)));

2173

CV_INIT(&V_attachCV(vp), "vp attach", CV_DEFAULT, 0)(void)((pthread_cond_init(&((vp)->attach_cv), ((void *
)0)) == 0) || (osi_AssertFailU("pthread_cond_init(&((vp)->attach_cv), NULL) == 0"
, "./../vol/volume.c", 2173), 0));

2174

}

2175

2176

/* link the volume with its associated vice partition */

2177

vp->device = partp->device;

2178

vp->partition = partp;

2179

2180

vp->hashid = vid;

2181

vp->specialStatus = 0;

2182

2183

/* if we dropped the lock, reacquire the lock,

2184

* check for pre-attach races, and then add

2185

* the volume to the hash table */

2186

if (nvp) {

2187

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 2187), 0));

2188

nvp = VLookupVolume_r(ec, vid, NULL((void *)0));

2189

if (*ec) {

2190

free(vp);

2191

vp = NULL((void *)0);

2192

goto done;

2193

} else if (nvp) { /* race detected */

2194

free(vp);

2195

vp = nvp;

2196

goto done;

2197

} else {

2198

/* hack to make up for VChangeState_r() decrementing

2199

* the old state counter */

2200

VStats.state_levels[0]++;

2201

}

2202

}

2203

2204

/* put pre-attached volume onto the hash table

2205

* and bring it up to the pre-attached state */

2206

AddVolumeToHashTable(vp, vp->hashid);

2207

AddVolumeToVByPList_r(vp);

2208

VLRU_Init_Node_r(vp);

2209

VChangeState_r(vp, VOL_STATE_PREATTACHED);

2210

2211

if (LogLevel >= 5)

2212

Log("VPreAttachVolumeByVp_r: volume %u pre-attached\n", vp->hashid);

2213

2214

done:

2215

if (*ec)

2216

return NULL((void *)0);

2217

else

2218

return vp;

2219

}

2220

#endif /* AFS_DEMAND_ATTACH_FS */

2221

2222

/* Attach an existing volume, given its pathname, and return a

2223

pointer to the volume header information. The volume also

2224

normally goes online at this time. An offline volume

2225

must be reattached to make it go online */

2226

Volume *

2227

VAttachVolumeByName(Errorbit32 * ec, char *partition, char *name, int mode)

2228

{

2229

Volume *retVal;

2230

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 2230), 0));

2231

retVal = VAttachVolumeByName_r(ec, partition, name, mode);

2232

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2232), 0));

2233

return retVal;

2234

}

2235

2236

Volume *

2237

VAttachVolumeByName_r(Errorbit32 * ec, char *partition, char *name, int mode)

2238

{

2239

Volume *vp = NULL((void *)0);

2240

struct DiskPartition64 *partp;

2241

char path[64];

2242

int isbusy = 0;

2243

VolId volumeId;

2244

int checkedOut;

2245

#ifdef AFS_DEMAND_ATTACH_FS1

2246

VolumeStats stats_save;

2247

Volume *svp = NULL((void *)0);

2248

#endif /* AFS_DEMAND_ATTACH_FS */

2249

2250

*ec = 0;

2251

2252

volumeId = VolumeNumber(name);

2253

2254

if (!(partp = VGetPartition_r(partition, 0))) {

1	Taking false branch

2255

*ec = VNOVOL103;

2256

Log("VAttachVolume: Error getting partition (%s)\n", partition);

2257

goto done;

2258

}

2259

2260

if (VRequiresPartLock()) {

2	Taking false branch

2261

osi_Assert(VInit == 3)(void)((VInit == 3) || (osi_AssertFailU("VInit == 3", "./../vol/volume.c"
, 2261), 0));

2262

VLockPartition_r(partition);

2263

} else if (programType == fileServer) {

3	Taking true branch

2264

#ifdef AFS_DEMAND_ATTACH_FS1

2265

/* lookup the volume in the hash table */

2266

vp = VLookupVolume_r(ec, volumeId, NULL((void *)0));

2267

if (*ec) {

4	Taking false branch

2268

return NULL((void *)0);

2269

}

2270

2271

if (vp) {

5	Taking false branch

2272

/* save any counters that are supposed to

2273

* be monotonically increasing over the

2274

* lifetime of the fileserver */

2275

memcpy(&stats_save, &vp->stats, sizeof(VolumeStats));

2276

} else {

2277

memset(&stats_save, 0, sizeof(VolumeStats));

2278

}

2279

2280

/* if there's something in the hash table, and it's not

2281

* in the pre-attach state, then we may need to detach

2282

* it before proceeding */

2283

if (vp && (V_attachState(vp)((vp)->attach_state) != VOL_STATE_PREATTACHED)) {

6	Taking false branch

2284

VCreateReservation_r(vp);

2285

VWaitExclusiveState_r(vp);

2286

2287

/* at this point state must be one of:

2288

* - UNATTACHED

2289

* - ATTACHED

2290

* - SHUTTING_DOWN

2291

* - GOING_OFFLINE

2292

* - SALVAGING

2293

* - ERROR

2294

* - DELETED

2295

2296

2297

if (vp->specialStatus == VBUSY110)

2298

isbusy = 1;

2299

2300

/* if it's already attached, see if we can return it */

2301

if (V_attachState(vp)((vp)->attach_state) == VOL_STATE_ATTACHED) {

2302

VGetVolumeByVp_r(ec, vp);

2303

if (V_inUse(vp)((vp)->header->diskstuff.inUse) == fileServer) {

2304

VCancelReservation_r(vp);

2305

return vp;

2306

}

2307

2308

/* otherwise, we need to detach, and attempt to re-attach */

2309

VDetachVolume_r(ec, vp);

2310

if (*ec) {

2311

Log("VAttachVolume: Error detaching old volume instance (%s)\n", name);

2312

}

2313

} else {

2314

/* if it isn't fully attached, delete from the hash tables,

2315

and let the refcounter handle the rest */

2316

DeleteVolumeFromHashTable(vp);

2317

DeleteVolumeFromVByPList_r(vp);

2318

}

2319

2320

VCancelReservation_r(vp);

2321

vp = NULL((void *)0);

2322

}

2323

2324

/* pre-attach volume if it hasn't been done yet */

2325

if (!vp ||

7	Taking true branch

2326

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_UNATTACHED) ||

2327

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_DELETED) ||

2328

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_ERROR)) {

2329

svp = vp;

8	Assigned value is always the same as the existing value

2330

vp = VPreAttachVolumeByVp_r(ec, partp, vp, volumeId);

2331

if (*ec) {

2332

return NULL((void *)0);

2333

}

2334

}

2335

2336

osi_Assert(vp != NULL)(void)((vp != ((void *)0)) || (osi_AssertFailU("vp != NULL", "./../vol/volume.c"
, 2336), 0));

2337

2338

/* handle pre-attach races

2339

2340

* multiple threads can race to pre-attach a volume,

2341

* but we can't let them race beyond that

2342

2343

* our solution is to let the first thread to bring

2344

* the volume into an exclusive state win; the other

2345

* threads just wait until it finishes bringing the

2346

* volume online, and then they do a vgetvolumebyvp

2347

2348

if (svp && (svp != vp)) {

2349

/* wait for other exclusive ops to finish */

2350

VCreateReservation_r(vp);

2351

VWaitExclusiveState_r(vp);

2352

2353

/* get a heavyweight ref, kill the lightweight ref, and return */

2354

VGetVolumeByVp_r(ec, vp);

2355

VCancelReservation_r(vp);

2356

return vp;

2357

}

2358

2359

/* at this point, we are chosen as the thread to do

2360

* demand attachment for this volume. all other threads

2361

* doing a getvolume on vp->hashid will block until we finish */

2362

2363

/* make sure any old header cache entries are invalidated

2364

* before proceeding */

2365

FreeVolumeHeader(vp);

2366

2367

VChangeState_r(vp, VOL_STATE_ATTACHING);

2368

2369

/* restore any saved counters */

2370

memcpy(&vp->stats, &stats_save, sizeof(VolumeStats));

2371

#else /* AFS_DEMAND_ATTACH_FS */

2372

vp = VGetVolume_r(ec, volumeId);

2373

if (vp) {

2374

if (V_inUse(vp)((vp)->header->diskstuff.inUse) == fileServer)

2375

return vp;

2376

if (vp->specialStatus == VBUSY110)

2377

isbusy = 1;

2378

VDetachVolume_r(ec, vp);

2379

if (*ec) {

2380

Log("VAttachVolume: Error detaching volume (%s)\n", name);

2381

}

2382

vp = NULL((void *)0);

2383

}

2384

#endif /* AFS_DEMAND_ATTACH_FS */

2385

}

2386

2387

*ec = 0;

2388

strcpy(path, VPartitionPath(partp));

2389

2390

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2390), 0));

2391

2392

strcat(path, OS_DIRSEP"/");

2393

strcat(path, name);

2394

2395

if (!vp) {

2396

vp = (Volume *) calloc(1, sizeof(Volume));

2397

osi_Assert(vp != NULL)(void)((vp != ((void *)0)) || (osi_AssertFailU("vp != NULL", "./../vol/volume.c"
, 2397), 0));

2398

vp->hashid = volumeId;

2399

vp->device = partp->device;

2400

vp->partition = partp;

2401

queue_Init(&vp->vnode_list)(((struct rx_queue *)(&vp->vnode_list)))->prev = ((
(struct rx_queue *)(&vp->vnode_list)))->next = (((struct
rx_queue *)(&vp->vnode_list)));

2402

queue_Init(&vp->rx_call_list)(((struct rx_queue *)(&vp->rx_call_list)))->prev = (
((struct rx_queue *)(&vp->rx_call_list)))->next = (
((struct rx_queue *)(&vp->rx_call_list)));

2403

#ifdef AFS_DEMAND_ATTACH_FS1

2404

2405

#endif /* AFS_DEMAND_ATTACH_FS */

2406

}

2407

2408

/* attach2 is entered without any locks, and returns

2409

* with vol_glock_mutex held */

2410

vp = attach2(ec, volumeId, path, partp, vp, isbusy, mode, &checkedOut);

2411

2412

if (VCanUseFSSYNC() && vp) {

2413

#ifdef AFS_DEMAND_ATTACH_FS1

2414

if ((mode == V_VOLUPD3) || (VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0) && (mode == V_CLONE2))) {

2415

/* mark volume header as in use so that volser crashes lead to a

2416

* salvage attempt */

2417

VUpdateVolume_r(ec, vp, 0);

2418

}

2419

/* for dafs, we should tell the fileserver, except for V_PEEK

2420

* where we know it is not necessary */

2421

if (mode == V_PEEK6) {

2422

vp->needsPutBack = 0;

2423

} else {

2424

vp->needsPutBack = VOL_PUTBACK1;

2425

}

2426

#else /* !AFS_DEMAND_ATTACH_FS */

2427

/* duplicate computation in fssync.c about whether the server

2428

* takes the volume offline or not. If the volume isn't

2429

* offline, we must not return it when we detach the volume,

2430

* or the server will abort */

2431

if (mode == V_READONLY1 || mode == V_PEEK6

2432

|| (!VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0) && (mode == V_CLONE2 || mode == V_DUMP4)))

2433

vp->needsPutBack = 0;

2434

else

2435

vp->needsPutBack = VOL_PUTBACK1;

2436

#endif /* !AFS_DEMAND_ATTACH_FS */

2437

}

2438

#ifdef FSSYNC_BUILD_CLIENT

2439

/* Only give back the vol to the fileserver if we checked it out; attach2

2440

* will set checkedOut only if we successfully checked it out from the

2441

* fileserver. */

2442

if (VCanUseFSSYNC() && vp == NULL((void *)0) && checkedOut) {

2443

2444

#ifdef AFS_DEMAND_ATTACH_FS1

2445

/* If we couldn't attach but we scheduled a salvage, we already

2446

* notified the fileserver; don't online it now */

2447

if (*ec != VSALVAGING113)

2448

#endif /* AFS_DEMAND_ATTACH_FS */

2449

FSYNC_VolOp(volumeId, partition, FSYNC_VOL_ON, 0, NULL((void *)0));

2450

} else

2451

#endif

2452

if (programType == fileServer && vp) {

2453

#ifdef AFS_DEMAND_ATTACH_FS1

2454

2455

* we can get here in cases where we don't "own"

2456

* the volume (e.g. volume owned by a utility).

2457

* short circuit around potential disk header races.

2458

2459

if (V_attachState(vp)((vp)->attach_state) != VOL_STATE_ATTACHED) {

2460

goto done;

2461

}

2462

#endif

2463

VUpdateVolume_r(ec, vp, 0);

2464

if (*ec) {

2465

Log("VAttachVolume: Error updating volume\n");

2466

if (vp)

2467

VPutVolume_r(vp);

2468

goto done;

2469

}

2470

if (VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0) && V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) == 0) {

2471

#ifndef AFS_DEMAND_ATTACH_FS1

2472

/* This is a hack: by temporarily setting the incore

2473

* dontSalvage flag ON, the volume will be put back on the

2474

* Update list (with dontSalvage OFF again). It will then

2475

* come back in N minutes with DONT_SALVAGE eventually

2476

* set. This is the way that volumes that have never had

2477

* it set get it set; or that volumes that have been

2478

* offline without DONT SALVAGE having been set also

2479

* eventually get it set */

2480

V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) = DONT_SALVAGE0xE5;

2481

#endif /* !AFS_DEMAND_ATTACH_FS */

2482

VAddToVolumeUpdateList_r(ec, vp);

2483

if (*ec) {

2484

Log("VAttachVolume: Error adding volume to update list\n");

2485

if (vp)

2486

VPutVolume_r(vp);

2487

goto done;

2488

}

2489

}

2490

if (LogLevel)

2491

Log("VOnline: volume %u (%s) attached and online\n", V_id(vp)((vp)->header->diskstuff.id),

2492

V_name(vp)((vp)->header->diskstuff.name));

2493

}

2494

2495

done:

2496

if (VRequiresPartLock()) {

2497

VUnlockPartition_r(partition);

2498

}

2499

if (*ec) {

2500

#ifdef AFS_DEMAND_ATTACH_FS1

2501

/* attach failed; make sure we're in error state */

2502

if (vp && !VIsErrorState(V_attachState(vp)((vp)->attach_state))) {

2503

VChangeState_r(vp, VOL_STATE_ERROR);

2504

}

2505

#endif /* AFS_DEMAND_ATTACH_FS */

2506

return NULL((void *)0);

2507

} else {

2508

return vp;

2509

}

2510

}

2511

2512

#ifdef AFS_DEMAND_ATTACH_FS1

2513

/* VAttachVolumeByVp_r

2514

2515

* finish attaching a volume that is

2516

* in a less than fully attached state

2517

2518

/* caller MUST hold a ref count on vp */

2519

static Volume *

2520

VAttachVolumeByVp_r(Errorbit32 * ec, Volume * vp, int mode)

2521

{

2522

char name[VMAXPATHLEN64];

2523

int reserve = 0;

2524

struct DiskPartition64 *partp;

2525

char path[64];

2526

int isbusy = 0;

2527

VolId volumeId;

2528

Volume * nvp = NULL((void *)0);

2529

VolumeStats stats_save;

2530

int checkedOut;

2531

*ec = 0;

2532

2533

/* volume utility should never call AttachByVp */

2534

osi_Assert(programType == fileServer)(void)((programType == fileServer) || (osi_AssertFailU("programType == fileServer"
, "./../vol/volume.c", 2534), 0));

2535

2536

volumeId = vp->hashid;

2537

partp = vp->partition;

2538

VolumeExternalName_r(volumeId, name, sizeof(name));

2539

2540

2541

/* if another thread is performing a blocking op, wait */

2542

VWaitExclusiveState_r(vp);

2543

2544

memcpy(&stats_save, &vp->stats, sizeof(VolumeStats));

2545

2546

/* if it's already attached, see if we can return it */

2547

if (V_attachState(vp)((vp)->attach_state) == VOL_STATE_ATTACHED) {

2548

VGetVolumeByVp_r(ec, vp);

2549

if (V_inUse(vp)((vp)->header->diskstuff.inUse) == fileServer) {

2550

return vp;

2551

} else {

2552

if (vp->specialStatus == VBUSY110)

2553

isbusy = 1;

2554

VDetachVolume_r(ec, vp);

2555

if (*ec) {

2556

Log("VAttachVolume: Error detaching volume (%s)\n", name);

2557

}

2558

vp = NULL((void *)0);

2559

}

2560

}

2561

2562

/* pre-attach volume if it hasn't been done yet */

2563

if (!vp ||

2564

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_UNATTACHED) ||

2565

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_DELETED) ||

2566

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_ERROR)) {

2567

nvp = VPreAttachVolumeByVp_r(ec, partp, vp, volumeId);

2568

if (*ec) {

2569

return NULL((void *)0);

2570

}

2571

if (nvp != vp) {

2572

reserve = 1;

2573

VCreateReservation_r(nvp);

2574

vp = nvp;

2575

}

2576

}

2577

2578

osi_Assert(vp != NULL)(void)((vp != ((void *)0)) || (osi_AssertFailU("vp != NULL", "./../vol/volume.c"
, 2578), 0));

2579

VChangeState_r(vp, VOL_STATE_ATTACHING);

2580

2581

/* restore monotonically increasing stats */

2582

memcpy(&vp->stats, &stats_save, sizeof(VolumeStats));

2583

2584

*ec = 0;

2585

2586

/* compute path to disk header */

2587

strcpy(path, VPartitionPath(partp));

2588

2589

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2589), 0));

2590

2591

strcat(path, OS_DIRSEP"/");

2592

strcat(path, name);

2593

2594

/* do volume attach

2595

2596

* NOTE: attach2 is entered without any locks, and returns

2597

* with vol_glock_mutex held */

2598

vp = attach2(ec, volumeId, path, partp, vp, isbusy, mode, &checkedOut);

2599

2600

2601

* the event that an error was encountered, or

2602

* the volume was not brought to an attached state

2603

* for any reason, skip to the end. We cannot

2604

* safely call VUpdateVolume unless we "own" it.

2605

2606

if (*ec ||

2607

(vp == NULL((void *)0)) ||

2608

(V_attachState(vp)((vp)->attach_state) != VOL_STATE_ATTACHED)) {

2609

goto done;

2610

}

2611

2612

VUpdateVolume_r(ec, vp, 0);

2613

if (*ec) {

2614

Log("VAttachVolume: Error updating volume %u\n", vp->hashid);

2615

VPutVolume_r(vp);

2616

goto done;

2617

}

2618

if (VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0) && V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) == 0) {

2619

#ifndef AFS_DEMAND_ATTACH_FS1

2620

/* This is a hack: by temporarily setting the incore

2621

* dontSalvage flag ON, the volume will be put back on the

2622

* Update list (with dontSalvage OFF again). It will then

2623

* come back in N minutes with DONT_SALVAGE eventually

2624

* set. This is the way that volumes that have never had

2625

* it set get it set; or that volumes that have been

2626

* offline without DONT SALVAGE having been set also

2627

* eventually get it set */

2628

V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) = DONT_SALVAGE0xE5;

2629

#endif /* !AFS_DEMAND_ATTACH_FS */

2630

VAddToVolumeUpdateList_r(ec, vp);

2631

if (*ec) {

2632

Log("VAttachVolume: Error adding volume %u to update list\n", vp->hashid);

2633

if (vp)

2634

VPutVolume_r(vp);

2635

goto done;

2636

}

2637

}

2638

if (LogLevel)

2639

Log("VOnline: volume %u (%s) attached and online\n", V_id(vp)((vp)->header->diskstuff.id),

2640

V_name(vp)((vp)->header->diskstuff.name));

2641

done:

2642

if (reserve) {

2643

VCancelReservation_r(nvp);

2644

reserve = 0;

2645

}

2646

if (*ec && (*ec != VOFFLINE106) && (*ec != VSALVAGE101)) {

2647

if (vp && !VIsErrorState(V_attachState(vp)((vp)->attach_state))) {

2648

VChangeState_r(vp, VOL_STATE_ERROR);

2649

}

2650

return NULL((void *)0);

2651

} else {

2652

return vp;

2653

}

2654

}

2655

2656

/**

2657

* lock a volume on disk (non-blocking).

2658

2659

* @param[in] vp The volume to lock

2660

* @param[in] locktype READ_LOCK or WRITE_LOCK

2661

2662

* @return operation status

2663

* @retval 0 success, lock was obtained

2664

* @retval EBUSY a conflicting lock was held by another process

2665

* @retval EIO error acquiring lock

2666

2667

* @pre If we're in the fileserver, vp is in an exclusive state

2668

2669

* @pre vp is not already locked

2670

2671

static int

2672

VLockVolumeNB(Volume *vp, int locktype)

2673

{

2674

int code;

2675

2676

osi_Assert(programType != fileServer || VIsExclusiveState(V_attachState(vp)))(void)((programType != fileServer || VIsExclusiveState(((vp)->
attach_state))) || (osi_AssertFailU("programType != fileServer || VIsExclusiveState(V_attachState(vp))"
, "./../vol/volume.c", 2676), 0));

2677

osi_Assert(!(V_attachFlags(vp) & VOL_LOCKED))(void)((!(((vp)->attach_flags) & VOL_LOCKED)) || (osi_AssertFailU
("!(V_attachFlags(vp) & VOL_LOCKED)", "./../vol/volume.c"
, 2677), 0));

2678

2679

code = VLockVolumeByIdNB(vp->hashid, vp->partition, locktype);

2680

if (code == 0) {

2681

V_attachFlags(vp)((vp)->attach_flags) |= VOL_LOCKED;

2682

}

2683

2684

return code;

2685

}

2686

2687

/**

2688

* unlock a volume on disk that was locked with VLockVolumeNB.

2689

2690

* @param[in] vp volume to unlock

2691

2692

* @pre If we're in the fileserver, vp is in an exclusive state

2693

2694

* @pre vp has already been locked

2695

2696

static void

2697

VUnlockVolume(Volume *vp)

2698

{

2699

2700

osi_Assert((V_attachFlags(vp) & VOL_LOCKED))(void)(((((vp)->attach_flags) & VOL_LOCKED)) || (osi_AssertFailU
("(V_attachFlags(vp) & VOL_LOCKED)", "./../vol/volume.c",
2700), 0));

2701

2702

VUnlockVolumeById(vp->hashid, vp->partition);

2703

2704

V_attachFlags(vp)((vp)->attach_flags) &= ~VOL_LOCKED;

2705

}

2706

#endif /* AFS_DEMAND_ATTACH_FS */

2707

2708

/**

2709

* read in a vol header, possibly lock the vol header, and possibly check out

2710

* the vol header from the fileserver, as part of volume attachment.

2711

2712

* @param[out] ec error code

2713

* @param[in] vp volume pointer object

2714

* @param[in] partp disk partition object of the attaching partition

2715

* @param[in] mode attachment mode such as V_VOLUPD, V_DUMP, etc (see

2716

* volume.h)

2717

* @param[in] peek 1 to just try to read in the volume header and make sure

2718

* we don't try to lock the vol, or check it out from

2719

* FSSYNC or anything like that; 0 otherwise, for 'normal'

2720

* operation

2721

* @param[out] acheckedOut If we successfully checked-out the volume from

2722

* the fileserver (if we needed to), this is set

2723

* to 1, otherwise it is untouched.

2724

2725

* @note As part of DAFS volume attachment, the volume header may be either

2726

* read- or write-locked to ensure mutual exclusion of certain volume

2727

* operations. In some cases in order to determine whether we need to

2728

* read- or write-lock the header, we need to read in the header to see

2729

* if the volume is RW or not. So, if we read in the header under a

2730

* read-lock and determine that we actually need a write-lock on the

2731

* volume header, this function will drop the read lock, acquire a write

2732

* lock, and read the header in again.

2733

2734

static void

2735

attach_volume_header(Errorbit32 *ec, Volume *vp, struct DiskPartition64 *partp,

2736

int mode, int peek, int *acheckedOut)

2737

{

2738

struct VolumeDiskHeader diskHeader;

2739

struct VolumeHeader header;

2740

int code;

2741

int first_try = 1;

2742

int lock_tries = 0, checkout_tries = 0;

2743

int retry;

2744

VolumeId volid = vp->hashid;

2745

#ifdef FSSYNC_BUILD_CLIENT

2746

int checkout, done_checkout = 0;

2747

#endif /* FSSYNC_BUILD_CLIENT */

2748

#ifdef AFS_DEMAND_ATTACH_FS1

2749

int locktype = 0, use_locktype = -1;

2750

#endif /* AFS_DEMAND_ATTACH_FS */

2751

2752

retry:

2753

retry = 0;

2754

*ec = 0;

2755

2756

if (lock_tries > VOL_MAX_CHECKOUT_RETRIES10) {

2757

Log("VAttachVolume: retried too many times trying to lock header for "

2758

"vol %lu part %s; giving up\n", afs_printable_uint32_lu(volid),

2759

VPartitionPath(partp));

2760

*ec = VNOVOL103;

2761

goto done;

2762

}

2763

if (checkout_tries > VOL_MAX_CHECKOUT_RETRIES10) {

2764

Log("VAttachVolume: retried too many times trying to checkout "

2765

"vol %lu part %s; giving up\n", afs_printable_uint32_lu(volid),

2766

VPartitionPath(partp));

2767

*ec = VNOVOL103;

2768

goto done;

2769

}

2770

2771

if (VReadVolumeDiskHeader(volid, partp, NULL((void *)0))) {

2772

/* short-circuit the 'volume does not exist' case */

2773

*ec = VNOVOL103;

2774

goto done;

2775

}

2776

2777

#ifdef FSSYNC_BUILD_CLIENT

2778

checkout = !done_checkout;

2779

done_checkout = 1;

2780

if (!peek && checkout && VMustCheckoutVolume(mode)) {

2781

SYNC_response res;

2782

memset(&res, 0, sizeof(res));

2783

2784

if (FSYNC_VolOp(volid, VPartitionPath(partp), FSYNC_VOL_NEEDVOLUME, mode, &res)

2785

!= SYNC_OK) {

2786

2787

if (res.hdr.reason == FSYNC_SALVAGE) {

2788

Log("VAttachVolume: file server says volume %lu is salvaging\n",

2789

afs_printable_uint32_lu(volid));

2790

*ec = VSALVAGING113;

2791

} else {

2792

Log("VAttachVolume: attach of volume %lu apparently denied by file server\n",

2793

afs_printable_uint32_lu(volid));

2794

*ec = VNOVOL103; /* XXXX */

2795

}

2796

goto done;

2797

}

2798

*acheckedOut = 1;

2799

}

2800

#endif

2801

2802

#ifdef AFS_DEMAND_ATTACH_FS1

2803

if (use_locktype < 0) {

2804

/* don't know whether vol is RO or RW; assume it's RO and we can retry

2805

* if it turns out to be RW */

2806

locktype = VVolLockType(mode, 0);

2807

2808

} else {

2809

/* a previous try says we should use use_locktype to lock the volume,

2810

* so use that */

2811

locktype = use_locktype;

2812

}

2813

2814

if (!peek && locktype) {

2815

code = VLockVolumeNB(vp, locktype);

2816

if (code) {

2817

if (code == EBUSY16) {

2818

Log("VAttachVolume: another program has vol %lu locked\n",

2819

afs_printable_uint32_lu(volid));

2820

} else {

2821

Log("VAttachVolume: error %d trying to lock vol %lu\n",

2822

code, afs_printable_uint32_lu(volid));

2823

}

2824

2825

*ec = VNOVOL103;

2826

goto done;

2827

}

2828

}

2829

#endif /* AFS_DEMAND_ATTACH_FS */

2830

2831

code = VReadVolumeDiskHeader(volid, partp, &diskHeader);

2832

if (code) {

2833

if (code == EIO5) {

2834

*ec = VSALVAGE101;

2835

} else {

2836

*ec = VNOVOL103;

2837

}

2838

goto done;

2839

}

2840

2841

DiskToVolumeHeader(&header, &diskHeader);

2842

2843

IH_INIT(vp->vnodeIndex[vLarge].handle, partp->device, header.parent,((vp->vnodeIndex[0].handle) = ih_init((partp->device), (
header.parent), (header.largeVnodeIndex)))

2844

header.largeVnodeIndex)((vp->vnodeIndex[0].handle) = ih_init((partp->device), (
header.parent), (header.largeVnodeIndex)));

2845

IH_INIT(vp->vnodeIndex[vSmall].handle, partp->device, header.parent,((vp->vnodeIndex[1].handle) = ih_init((partp->device), (
header.parent), (header.smallVnodeIndex)))

2846

header.smallVnodeIndex)((vp->vnodeIndex[1].handle) = ih_init((partp->device), (
header.parent), (header.smallVnodeIndex)));

2847

IH_INIT(vp->diskDataHandle, partp->device, header.parent,((vp->diskDataHandle) = ih_init((partp->device), (header
.parent), (header.volumeInfo)))

2848

header.volumeInfo)((vp->diskDataHandle) = ih_init((partp->device), (header
.parent), (header.volumeInfo)));

2849

IH_INIT(vp->linkHandle, partp->device, header.parent, header.linkTable)((vp->linkHandle) = ih_init((partp->device), (header.parent
), (header.linkTable)));

2850

2851

if (first_try) {

2852

/* only need to do this once */

2853

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 2853), 0));

2854

GetVolumeHeader(vp);

2855

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2855), 0));

2856

}

2857

2858

#if defined(AFS_DEMAND_ATTACH_FS1) && defined(FSSYNC_BUILD_CLIENT)

2859

/* demand attach changes the V_PEEK mechanism

2860

2861

* we can now suck the current disk data structure over

2862

* the fssync interface without going to disk

2863

2864

* (technically, we don't need to restrict this feature

2865

* to demand attach fileservers. However, I'm trying

2866

* to limit the number of common code changes)

2867

2868

if (VCanUseFSSYNC() && (mode == V_PEEK6 || peek)) {

2869

SYNC_response res;

2870

res.payload.len = sizeof(VolumeDiskData);

2871

res.payload.buf = &vp->header->diskstuff;

2872

2873

if (FSYNC_VolOp(vp->hashid,

2874

partp->name,

2875

FSYNC_VOL_QUERY_HDR,

2876

FSYNC_WHATEVER,

2877

&res) == SYNC_OK) {

2878

goto disk_header_loaded;

2879

}

2880

}

2881

#endif /* AFS_DEMAND_ATTACH_FS && FSSYNC_BUILD_CLIENT */

2882

(void)ReadHeader(ec, V_diskDataHandle(vp)((vp)->diskDataHandle), (char *)&V_disk(vp)((vp)->header->diskstuff),

2883

sizeof(V_disk(vp)((vp)->header->diskstuff)), VOLUMEINFOMAGIC((bit32)0x78a1b2c5), VOLUMEINFOVERSION1);

2884

2885

#ifdef AFS_DEMAND_ATTACH_FS1

2886

/* update stats */

2887

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 2887), 0));

2888

IncUInt64(&VStats.hdr_loads)(*(&VStats.hdr_loads))++;

2889

IncUInt64(&vp->stats.hdr_loads)(*(&vp->stats.hdr_loads))++;

2890

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2890), 0));

2891

#endif /* AFS_DEMAND_ATTACH_FS */

2892

2893

if (*ec) {

2894

Log("VAttachVolume: Error reading diskDataHandle header for vol %lu; "

2895

"error=%u\n", afs_printable_uint32_lu(volid), *ec);

2896

goto done;

2897

}

2898

2899

#ifdef AFS_DEMAND_ATTACH_FS1

2900

# ifdef FSSYNC_BUILD_CLIENT

2901

disk_header_loaded:

2902

# endif /* FSSYNC_BUILD_CLIENT */

2903

2904

/* if the lock type we actually used to lock the volume is different than

2905

* the lock type we should have used, retry with the lock type we should

2906

* use */

2907

use_locktype = VVolLockType(mode, VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0));

2908

if (locktype != use_locktype) {

2909

retry = 1;

2910

lock_tries++;

2911

}

2912

#endif /* AFS_DEMAND_ATTACH_FS */

2913

2914

*ec = 0;

2915

2916

done:

2917

#if defined(AFS_DEMAND_ATTACH_FS1) && defined(FSSYNC_BUILD_CLIENT)

2918

if (!peek && *ec == 0 && retry == 0 && VMustCheckoutVolume(mode)) {

2919

2920

code = FSYNC_VerifyCheckout(volid, VPartitionPath(partp), FSYNC_VOL_NEEDVOLUME, mode);

2921

2922

if (code == SYNC_DENIED) {

2923

/* must retry checkout; fileserver no longer thinks we have

2924

* the volume */

2925

retry = 1;

2926

checkout_tries++;

2927

done_checkout = 0;

2928

2929

} else if (code != SYNC_OK) {

2930

*ec = VNOVOL103;

2931

}

2932

}

2933

#endif /* AFS_DEMAND_ATTACH_FS && FSSYNC_BUILD_CLIENT */

2934

2935

if (*ec || retry) {

2936

/* either we are going to be called again for a second pass, or we

2937

* encountered an error; clean up in either case */

2938

2939

#ifdef AFS_DEMAND_ATTACH_FS1

2940

if ((V_attachFlags(vp)((vp)->attach_flags) & VOL_LOCKED)) {

2941

VUnlockVolume(vp);

2942

}

2943

#endif /* AFS_DEMAND_ATTACH_FS */

2944

if (vp->linkHandle) {

2945

IH_RELEASE(vp->vnodeIndex[vLarge].handle)(ih_release(vp->vnodeIndex[0].handle), (vp->vnodeIndex[
0].handle)=((void *)0), 0);

2946

IH_RELEASE(vp->vnodeIndex[vSmall].handle)(ih_release(vp->vnodeIndex[1].handle), (vp->vnodeIndex[
1].handle)=((void *)0), 0);

2947

IH_RELEASE(vp->diskDataHandle)(ih_release(vp->diskDataHandle), (vp->diskDataHandle)=(
(void *)0), 0);

2948

IH_RELEASE(vp->linkHandle)(ih_release(vp->linkHandle), (vp->linkHandle)=((void *)
0), 0);

2949

}

2950

}

2951

2952

if (*ec) {

2953

return;

2954

}

2955

if (retry) {

2956

first_try = 0;

2957

goto retry;

2958

}

2959

}

2960

2961

#ifdef AFS_DEMAND_ATTACH_FS1

2962

static void

2963

attach_check_vop(Errorbit32 *ec, VolumeId volid, struct DiskPartition64 *partp,

2964

Volume *vp, int *acheckedOut)

2965

{

2966

*ec = 0;

2967

2968

if (vp->pending_vol_op) {

2969

2970

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 2970), 0));

2971

2972

if (vp->pending_vol_op->vol_op_state == FSSYNC_VolOpRunningUnknown) {

2973

int code;

2974

code = VVolOpLeaveOnlineNoHeader_r(vp, vp->pending_vol_op);

2975

if (code == 1) {

2976

vp->pending_vol_op->vol_op_state = FSSYNC_VolOpRunningOnline;

2977

} else if (code == 0) {

2978

vp->pending_vol_op->vol_op_state = FSSYNC_VolOpRunningOffline;

2979

2980

} else {

2981

/* we need the vol header to determine if the volume can be

2982

* left online for the vop, so... get the header */

2983

2984

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 2984), 0));

2985

2986

/* attach header with peek=1 to avoid checking out the volume

2987

* or locking it; we just want the header info, we're not

2988

* messing with the volume itself at all */

2989

attach_volume_header(ec, vp, partp, V_PEEK6, 1, acheckedOut);

2990

if (*ec) {

2991

return;

2992

}

2993

2994

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 2994), 0));

2995

2996

if (VVolOpLeaveOnline_r(vp, vp->pending_vol_op)) {

2997

vp->pending_vol_op->vol_op_state = FSSYNC_VolOpRunningOnline;

2998

} else {

2999

vp->pending_vol_op->vol_op_state = FSSYNC_VolOpRunningOffline;

3000

}

3001

3002

/* make sure we grab a new vol header and re-open stuff on

3003

* actual attachment; we can't keep the data we grabbed, since

3004

* it was not done under a lock and thus not safe */

3005

FreeVolumeHeader(vp);

3006

VReleaseVolumeHandles_r(vp);

3007

}

3008

}

3009

/* see if the pending volume op requires exclusive access */

3010

switch (vp->pending_vol_op->vol_op_state) {

3011

case FSSYNC_VolOpPending:

3012

/* this should never happen */

3013

osi_Assert(vp->pending_vol_op->vol_op_state != FSSYNC_VolOpPending)(void)((vp->pending_vol_op->vol_op_state != FSSYNC_VolOpPending
) || (osi_AssertFailU("vp->pending_vol_op->vol_op_state != FSSYNC_VolOpPending"
, "./../vol/volume.c", 3013), 0));

3014

break;

3015

3016

case FSSYNC_VolOpRunningUnknown:

3017

/* this should never happen; we resolved 'unknown' above */

3018

osi_Assert(vp->pending_vol_op->vol_op_state != FSSYNC_VolOpRunningUnknown)(void)((vp->pending_vol_op->vol_op_state != FSSYNC_VolOpRunningUnknown
) || (osi_AssertFailU("vp->pending_vol_op->vol_op_state != FSSYNC_VolOpRunningUnknown"
, "./../vol/volume.c", 3018), 0));

3019

break;

3020

3021

case FSSYNC_VolOpRunningOffline:

3022

/* mark the volume down */

3023

*ec = VOFFLINE106;

3024

VChangeState_r(vp, VOL_STATE_UNATTACHED);

3025

3026

/* do not set V_offlineMessage here; we don't have ownership of

3027

* the volume (and probably do not have the header loaded), so we

3028

* can't alter the disk header */

3029

3030

/* check to see if we should set the specialStatus flag */

3031

if (VVolOpSetVBusy_r(vp, vp->pending_vol_op)) {

3032

/* don't overwrite specialStatus if it was already set to

3033

* something else (e.g. VMOVED) */

3034

if (!vp->specialStatus) {

3035

vp->specialStatus = VBUSY110;

3036

}

3037

}

3038

break;

3039

3040

default:

3041

break;

3042

}

3043

3044

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3044), 0));

3045

}

3046

}

3047

#endif /* AFS_DEMAND_ATTACH_FS */

3048

3049

/**

3050

* volume attachment helper function.

3051

3052

* @param[out] ec error code

3053

* @param[in] volumeId volume ID of the attaching volume

3054

* @param[in] path full path to the volume header .vol file

3055

* @param[in] partp disk partition object for the attaching partition

3056

* @param[in] vp volume object; vp->hashid, vp->device, vp->partition,

3057

* vp->vnode_list, vp->rx_call_list, and V_attachCV (for

3058

* DAFS) should already be initialized

3059

* @param[in] isbusy 1 if vp->specialStatus should be set to VBUSY; that is,

3060

* if there is a volume operation running for this volume

3061

* that should set the volume to VBUSY during its run. 0

3062

* otherwise. (see VVolOpSetVBusy_r)

3063

* @param[in] mode attachment mode such as V_VOLUPD, V_DUMP, etc (see

3064

* volume.h)

3065

* @param[out] acheckedOut If we successfully checked-out the volume from

3066

* the fileserver (if we needed to), this is set

3067

* to 1, otherwise it is 0.

3068

3069

* @return pointer to the semi-attached volume pointer

3070

* @retval NULL an error occurred (check value of *ec)

3071

* @retval vp volume successfully attaching

3072

3073

* @pre no locks held

3074

3075

* @post VOL_LOCK held

3076

3077

static Volume *

3078

attach2(Errorbit32 * ec, VolId volumeId, char *path, struct DiskPartition64 *partp,

3079

Volume * vp, int isbusy, int mode, int *acheckedOut)

3080

{

3081

/* have we read in the header successfully? */

3082

int read_header = 0;

3083

3084

#ifdef AFS_DEMAND_ATTACH_FS1

3085

/* should we FreeVolume(vp) instead of VCheckFree(vp) in the error

3086

* cleanup? */

3087

int forcefree = 0;

3088

3089

/* in the case of an error, to what state should the volume be

3090

* transitioned? */

3091

VolState error_state = VOL_STATE_ERROR;

3092

#endif /* AFS_DEMAND_ATTACH_FS */

3093

3094

*ec = 0;

3095

3096

vp->vnodeIndex[vLarge0].handle = NULL((void *)0);

3097

vp->vnodeIndex[vSmall1].handle = NULL((void *)0);

3098

vp->diskDataHandle = NULL((void *)0);

3099

vp->linkHandle = NULL((void *)0);

3100

3101

*acheckedOut = 0;

3102

3103

#ifdef AFS_DEMAND_ATTACH_FS1

3104

attach_check_vop(ec, volumeId, partp, vp, acheckedOut);

3105

if (!*ec) {

3106

attach_volume_header(ec, vp, partp, mode, 0, acheckedOut);

3107

}

3108

#else

3109

attach_volume_header(ec, vp, partp, mode, 0, acheckedOut);

3110

#endif /* !AFS_DEMAND_ATTACH_FS */

3111

3112

if (*ec == VNOVOL103) {

3113

/* if the volume doesn't exist, skip straight to 'error' so we don't

3114

* request a salvage */

3115

goto unlocked_error;

3116

}

3117

3118

if (!*ec) {

3119

read_header = 1;

3120

3121

/* ensure that we don't override specialStatus if it was set to

3122

* something else (e.g. VMOVED) */

3123

if (isbusy && !vp->specialStatus) {

3124

vp->specialStatus = VBUSY110;

3125

}

3126

vp->shuttingDown = 0;

3127

vp->goingOffline = 0;

3128

vp->nUsers = 1;

3129

#ifdef AFS_DEMAND_ATTACH_FS1

3130

vp->stats.last_attach = FT_ApproxTime();

3131

vp->stats.attaches++;

3132

#endif

3133

3134

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3134), 0));

3135

IncUInt64(&VStats.attaches)(*(&VStats.attaches))++;

3136

vp->cacheCheck = ++VolumeCacheCheck;

3137

/* just in case this ever rolls over */

3138

if (!vp->cacheCheck)

3139

vp->cacheCheck = ++VolumeCacheCheck;

3140

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3140), 0));

3141

3142

#ifdef AFS_DEMAND_ATTACH_FS1

3143

V_attachFlags(vp)((vp)->attach_flags) |= VOL_HDR_LOADED;

3144

vp->stats.last_hdr_load = vp->stats.last_attach;

3145

#endif /* AFS_DEMAND_ATTACH_FS */

3146

}

3147

3148

if (!*ec) {

3149

struct IndexFileHeader iHead;

3150

3151

#if OPENAFS_VOL_STATS1

3152

3153

* We just read in the diskstuff part of the header. If the detailed

3154

* volume stats area has not yet been initialized, we should bzero the

3155

* area and mark it as initialized.

3156

3157

if (!(V_stat_initialized(vp)((vp)->header->diskstuff.stat_initialized))) {

3158

memset((V_stat_area(vp)(((vp)->header->diskstuff.stat_reads))), 0, VOL_STATS_BYTES128);

3159

V_stat_initialized(vp)((vp)->header->diskstuff.stat_initialized) = 1;

3160

}

3161

#endif /* OPENAFS_VOL_STATS */

3162

3163

(void)ReadHeader(ec, vp->vnodeIndex[vSmall1].handle,

3164

(char *)&iHead, sizeof(iHead),

3165

SMALLINDEXMAGIC0x99776655, SMALLINDEXVERSION1);

3166

3167

if (*ec) {

3168

Log("VAttachVolume: Error reading smallVnode vol header %s; error=%u\n", path, *ec);

3169

}

3170

}

3171

3172

if (!*ec) {

3173

struct IndexFileHeader iHead;

3174

3175

(void)ReadHeader(ec, vp->vnodeIndex[vLarge0].handle,

3176

(char *)&iHead, sizeof(iHead),

3177

LARGEINDEXMAGIC0x88664433, LARGEINDEXVERSION1);

3178

3179

if (*ec) {

3180

Log("VAttachVolume: Error reading largeVnode vol header %s; error=%u\n", path, *ec);

3181

}

3182

}

3183

3184

#ifdef AFS_NAMEI_ENV1

3185

if (!*ec) {

3186

struct versionStamp stamp;

3187

3188

(void)ReadHeader(ec, V_linkHandle(vp)((vp)->linkHandle), (char *)&stamp,

3189

sizeof(stamp), LINKTABLEMAGIC0x99877712, LINKTABLEVERSION1);

3190

3191

if (*ec) {

3192

Log("VAttachVolume: Error reading namei vol header %s; error=%u\n", path, *ec);

3193

}

3194

}

3195

#endif /* AFS_NAMEI_ENV */

3196

3197

#if defined(AFS_DEMAND_ATTACH_FS1)

3198

if (*ec && ((*ec != VOFFLINE106) || (V_attachState(vp)((vp)->attach_state) != VOL_STATE_UNATTACHED))) {

3199

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3199), 0));

3200

if (!VCanScheduleSalvage()) {

3201

Log("VAttachVolume: Error attaching volume %s; volume needs salvage; error=%u\n", path, *ec);

3202

}

3203

VRequestSalvage_r(ec, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, VOL_SALVAGE_INVALIDATE_HEADER0x1 |

3204

VOL_SALVAGE_NO_OFFLINE0x2);

3205

vp->nUsers = 0;

3206

3207

goto locked_error;

3208

} else if (*ec) {

3209

/* volume operation in progress */

3210

goto unlocked_error;

3211

}

3212

#else /* AFS_DEMAND_ATTACH_FS */

3213

if (*ec) {

3214

Log("VAttachVolume: Error attaching volume %s; volume needs salvage; error=%u\n", path, *ec);

3215

goto unlocked_error;

3216

}

3217

#endif /* AFS_DEMAND_ATTACH_FS */

3218

3219

if (V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged)) {

3220

if (vp->specialStatus)

3221

vp->specialStatus = 0;

3222

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3222), 0));

3223

#if defined(AFS_DEMAND_ATTACH_FS1)

3224

if (!VCanScheduleSalvage()) {

3225

Log("VAttachVolume: volume salvage flag is ON for %s; volume needs salvage\n", path);

3226

}

3227

VRequestSalvage_r(ec, vp, SALVSYNC_NEEDEDSALVSYNC_REASON_NEEDED, VOL_SALVAGE_INVALIDATE_HEADER0x1 |

3228

VOL_SALVAGE_NO_OFFLINE0x2);

3229

vp->nUsers = 0;

3230

3231

#else /* AFS_DEMAND_ATTACH_FS */

3232

*ec = VSALVAGE101;

3233

#endif /* AFS_DEMAND_ATTACH_FS */

3234

3235

goto locked_error;

3236

}

3237

3238

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3238), 0));

3239

vp->nextVnodeUnique = V_uniquifier(vp)((vp)->header->diskstuff.uniquifier);

3240

3241

if (VShouldCheckInUse(mode) && V_inUse(vp)((vp)->header->diskstuff.inUse) && VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0)) {

3242

if (!V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged)) {

3243

V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged) = 1;

3244

VUpdateVolume_r(ec, vp, 0);

3245

}

3246

#if defined(AFS_DEMAND_ATTACH_FS1)

3247

if (!VCanScheduleSalvage()) {

3248

Log("VAttachVolume: volume %s needs to be salvaged; not attached.\n", path);

3249

}

3250

VRequestSalvage_r(ec, vp, SALVSYNC_NEEDEDSALVSYNC_REASON_NEEDED, VOL_SALVAGE_INVALIDATE_HEADER0x1 |

3251

VOL_SALVAGE_NO_OFFLINE0x2);

3252

vp->nUsers = 0;

3253

3254

#else /* AFS_DEMAND_ATTACH_FS */

3255

Log("VAttachVolume: volume %s needs to be salvaged; not attached.\n", path);

3256

*ec = VSALVAGE101;

3257

#endif /* AFS_DEMAND_ATTACH_FS */

3258

3259

goto locked_error;

3260

}

3261

3262

if (programType == fileServer && V_destroyMe(vp)((vp)->header->diskstuff.destroyMe) == DESTROY_ME0xD3) {

3263

/* Only check destroyMe if we are the fileserver, since the

3264

* volserver et al sometimes need to work with volumes with

3265

* destroyMe set. Examples are 'temporary' volumes the

3266

* volserver creates, and when we create a volume (destroyMe

3267

* is set on creation; sometimes a separate volserver

3268

* transaction is created to clear destroyMe).

3269

3270

3271

#if defined(AFS_DEMAND_ATTACH_FS1)

3272

/* schedule a salvage so the volume goes away on disk */

3273

VRequestSalvage_r(ec, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, VOL_SALVAGE_INVALIDATE_HEADER0x1 |

3274

VOL_SALVAGE_NO_OFFLINE0x2);

3275

VChangeState_r(vp, VOL_STATE_ERROR);

3276

vp->nUsers = 0;

3277

forcefree = 1;

3278

#endif /* AFS_DEMAND_ATTACH_FS */

3279

Log("VAttachVolume: volume %s is junk; it should be destroyed at next salvage\n", path);

3280

*ec = VNOVOL103;

3281

goto locked_error;

3282

}

3283

3284

vp->vnodeIndex[vSmall1].bitmap = vp->vnodeIndex[vLarge0].bitmap = NULL((void *)0);

3285

#ifndef BITMAP_LATER

3286

if (programType == fileServer && VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0)) {

3287

int i;

3288

for (i = 0; i < nVNODECLASSES(((1<<1)-1)+1); i++) {

3289

VGetBitmap_r(ec, vp, i);

3290

if (*ec) {

3291

#ifdef AFS_DEMAND_ATTACH_FS1

3292

VRequestSalvage_r(ec, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, VOL_SALVAGE_INVALIDATE_HEADER0x1 |

3293

VOL_SALVAGE_NO_OFFLINE0x2);

3294

vp->nUsers = 0;

3295

#endif /* AFS_DEMAND_ATTACH_FS */

3296

Log("VAttachVolume: error getting bitmap for volume (%s)\n",

3297

path);

3298

goto locked_error;

3299

}

3300

}

3301

}

3302

#endif /* BITMAP_LATER */

3303

3304

if (VInit >= 2 && V_needsCallback(vp)((vp)->header->diskstuff.needsCallback)) {

3305

if (V_BreakVolumeCallbacks) {

3306

Log("VAttachVolume: Volume %lu was changed externally; breaking callbacks\n",

3307

afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)));

3308

V_needsCallback(vp)((vp)->header->diskstuff.needsCallback) = 0;

3309

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3309), 0));

3310

(*V_BreakVolumeCallbacks) (V_id(vp)((vp)->header->diskstuff.id));

3311

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3311), 0));

3312

3313

VUpdateVolume_r(ec, vp, 0);

3314

}

3315

#ifdef FSSYNC_BUILD_CLIENT

3316

else if (VCanUseFSSYNC()) {

3317

afs_int32 fsync_code;

3318

3319

V_needsCallback(vp)((vp)->header->diskstuff.needsCallback) = 0;

3320

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3320), 0));

3321

fsync_code = FSYNC_VolOp(V_id(vp)((vp)->header->diskstuff.id), NULL((void *)0), FSYNC_VOL_BREAKCBKS, FSYNC_WHATEVER, NULL((void *)0));

3322

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3322), 0));

3323

3324

if (fsync_code) {

3325

V_needsCallback(vp)((vp)->header->diskstuff.needsCallback) = 1;

3326

Log("Error trying to tell the fileserver to break callbacks for "

3327

"changed volume %lu; error code %ld\n",

3328

afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)),

3329

afs_printable_int32_ld(fsync_code));

3330

} else {

3331

VUpdateVolume_r(ec, vp, 0);

3332

}

3333

}

3334

#endif /* FSSYNC_BUILD_CLIENT */

3335

3336

if (*ec) {

3337

Log("VAttachVolume: error %d clearing needsCallback on volume "

3338

"%lu; needs salvage\n", (int)*ec,

3339

afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)));

3340

#ifdef AFS_DEMAND_ATTACH_FS1

3341

VRequestSalvage_r(ec, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, VOL_SALVAGE_INVALIDATE_HEADER0x1 |

3342

VOL_SALVAGE_NO_OFFLINE0x2);

3343

vp->nUsers = 0;

3344

#else /* !AFS_DEMAND_ATTACH_FS */

3345

*ec = VSALVAGE101;

3346

#endif /* !AFS_DEMAND_ATTACh_FS */

3347

goto locked_error;

3348

}

3349

}

3350

3351

if (programType == fileServer) {

3352

if (vp->specialStatus)

3353

vp->specialStatus = 0;

3354

if (V_blessed(vp)((vp)->header->diskstuff.blessed) && V_inService(vp)((vp)->header->diskstuff.inService) && !V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged)) {

3355

V_inUse(vp)((vp)->header->diskstuff.inUse) = fileServer;

3356

V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)[0] = '\0';

3357

}

3358

if (!V_inUse(vp)((vp)->header->diskstuff.inUse)) {

3359

*ec = VNOVOL103;

3360

#ifdef AFS_DEMAND_ATTACH_FS1

3361

/* Put the vol into PREATTACHED state, so if someone tries to

3362

* access it again, we try to attach, see that we're not blessed,

3363

* and give a VNOVOL error again. Putting it into UNATTACHED state

3364

* would result in a VOFFLINE error instead. */

3365

error_state = VOL_STATE_PREATTACHED;

3366

#endif /* AFS_DEMAND_ATTACH_FS */

3367

3368

/* mimic e.g. GetVolume errors */

3369

if (!V_blessed(vp)((vp)->header->diskstuff.blessed)) {

3370

Log("Volume %lu offline: not blessed\n", afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)));

3371

FreeVolumeHeader(vp);

3372

} else if (!V_inService(vp)((vp)->header->diskstuff.inService)) {

3373

Log("Volume %lu offline: not in service\n", afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)));

3374

FreeVolumeHeader(vp);

3375

} else {

3376

Log("Volume %lu offline: needs salvage\n", afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)));

3377

*ec = VSALVAGE101;

3378

#ifdef AFS_DEMAND_ATTACH_FS1

3379

error_state = VOL_STATE_ERROR;

3380

/* see if we can recover */

3381

VRequestSalvage_r(ec, vp, SALVSYNC_NEEDEDSALVSYNC_REASON_NEEDED, VOL_SALVAGE_INVALIDATE_HEADER0x1);

3382

#endif

3383

}

3384

#ifdef AFS_DEMAND_ATTACH_FS1

3385

vp->nUsers = 0;

3386

#endif

3387

goto locked_error;

3388

}

3389

} else {

3390

#ifdef AFS_DEMAND_ATTACH_FS1

3391

if ((mode != V_PEEK6) && (mode != V_SECRETLY5))

3392

V_inUse(vp)((vp)->header->diskstuff.inUse) = programType;

3393

#endif /* AFS_DEMAND_ATTACH_FS */

3394

V_checkoutMode(vp)((vp)->checkoutMode) = mode;

3395

}

3396

3397

AddVolumeToHashTable(vp, V_id(vp)((vp)->header->diskstuff.id));

3398

#ifdef AFS_DEMAND_ATTACH_FS1

3399

if (VCanUnlockAttached() && (V_attachFlags(vp)((vp)->attach_flags) & VOL_LOCKED)) {

3400

VUnlockVolume(vp);

3401

}

3402

if ((programType != fileServer) ||

3403

(V_inUse(vp)((vp)->header->diskstuff.inUse) == fileServer)) {

3404

AddVolumeToVByPList_r(vp);

3405

VLRU_Add_r(vp);

3406

VChangeState_r(vp, VOL_STATE_ATTACHED);

3407

} else {

3408

VChangeState_r(vp, VOL_STATE_UNATTACHED);

3409

}

3410

#endif

3411

3412

return vp;

3413

3414

unlocked_error:

3415

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3415), 0));

3416

locked_error:

3417

#ifdef AFS_DEMAND_ATTACH_FS1

3418

if (!VIsErrorState(V_attachState(vp)((vp)->attach_state))) {

3419

VChangeState_r(vp, error_state);

3420

}

3421

#endif /* AFS_DEMAND_ATTACH_FS */

3422

3423

if (read_header) {

3424

VReleaseVolumeHandles_r(vp);

3425

}

3426

3427

#ifdef AFS_DEMAND_ATTACH_FS1

3428

VCheckSalvage(vp);

3429

if (forcefree) {

3430

FreeVolume(vp);

3431

} else {

3432

VCheckFree(vp);

3433

}

3434

#else /* !AFS_DEMAND_ATTACH_FS */

3435

FreeVolume(vp);

3436

#endif /* !AFS_DEMAND_ATTACH_FS */

3437

return NULL((void *)0);

3438

}

3439

3440

/* Attach an existing volume.

3441

The volume also normally goes online at this time.

3442

An offline volume must be reattached to make it go online.

3443

3444

3445

Volume *

3446

VAttachVolume(Errorbit32 * ec, VolumeId volumeId, int mode)

3447

{

3448

Volume *retVal;

3449

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3449), 0));

3450

retVal = VAttachVolume_r(ec, volumeId, mode);

3451

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3451), 0));

3452

return retVal;

3453

}

3454

3455

Volume *

3456

VAttachVolume_r(Errorbit32 * ec, VolumeId volumeId, int mode)

3457

{

3458

char *part, *name;

3459

VGetVolumePath(ec, volumeId, &part, &name);

3460

if (*ec) {

3461

Volume *vp;

3462

Errorbit32 error;

3463

vp = VGetVolume_r(&error, volumeId);

3464

if (vp) {

3465

osi_Assert(V_inUse(vp) == 0)(void)((((vp)->header->diskstuff.inUse) == 0) || (osi_AssertFailU
("V_inUse(vp) == 0", "./../vol/volume.c", 3465), 0));

3466

VDetachVolume_r(ec, vp);

3467

}

3468

return NULL((void *)0);

3469

}

3470

return VAttachVolumeByName_r(ec, part, name, mode);

3471

}

3472

3473

/* Increment a reference count to a volume, sans context swaps. Requires

3474

* possibly reading the volume header in from the disk, since there's

3475

* an invariant in the volume package that nUsers>0 ==> vp->header is valid.

3476

3477

* N.B. This call can fail if we can't read in the header!! In this case

3478

* we still guarantee we won't context swap, but the ref count won't be

3479

* incremented (otherwise we'd violate the invariant).

3480

3481

/* NOTE: with the demand attach fileserver extensions, the global lock

3482

* is dropped within VHold */

3483

#ifdef AFS_DEMAND_ATTACH_FS1

3484

static int

3485

VHold_r(Volume * vp)

3486

{

3487

Errorbit32 error;

3488

3489

VCreateReservation_r(vp);

3490

VWaitExclusiveState_r(vp);

3491

3492

LoadVolumeHeader(&error, vp);

3493

if (error) {

3494

VCancelReservation_r(vp);

3495

return error;

3496

}

3497

vp->nUsers++;

3498

VCancelReservation_r(vp);

3499

return 0;

3500

}

3501

#else /* AFS_DEMAND_ATTACH_FS */

3502

static int

3503

VHold_r(Volume * vp)

3504

{

3505

Errorbit32 error;

3506

3507

LoadVolumeHeader(&error, vp);

3508

if (error)

3509

return error;

3510

vp->nUsers++;

3511

return 0;

3512

}

3513

#endif /* AFS_DEMAND_ATTACH_FS */

3514

3515

/**** volume timeout-related stuff ****/

3516

3517

#ifdef AFS_PTHREAD_ENV1

3518

3519

static struct timespec *shutdown_timeout;

3520

static pthread_once_t shutdown_timeout_once = PTHREAD_ONCE_INIT{ 0, ((void *)0) };

3521

3522

static_inlinestatic inline int

3523

VTimedOut(const struct timespec *ts)

3524

{

3525

struct timeval tv;

3526

int code;

3527

3528

if (ts->tv_sec == 0) {

3529

/* short-circuit; this will have always timed out */

3530

return 1;

3531

}

3532

3533

code = gettimeofday(&tv, NULL((void *)0));

3534

if (code) {

3535

Log("Error %d from gettimeofday, assuming we have not timed out\n", errno(* __error()));

3536

/* assume no timeout; failure mode is we just wait longer than normal

3537

* instead of returning errors when we shouldn't */

3538

return 0;

3539

}

3540

3541

if (tv.tv_sec < ts->tv_sec ||

3542

(tv.tv_sec == ts->tv_sec && tv.tv_usec*1000 < ts->tv_nsec)) {

3543

3544

return 0;

3545

}

3546

3547

return 1;

3548

}

3549

3550

/**

3551

* Calculate an absolute timeout.

3552

3553

* @param[out] ts A timeout that is "timeout" seconds from now, if we return

3554

* NULL, the memory is not touched

3555

* @param[in] timeout How long the timeout should be from now

3556

3557

* @return timeout to use

3558

* @retval NULL no timeout; wait forever

3559

* @retval non-NULL the given value for "ts"

3560

3561

* @internal

3562

3563

static struct timespec *

3564

VCalcTimeout(struct timespec *ts, afs_int32 timeout)

3565

{

3566

struct timeval now;

3567

int code;

3568

3569

if (timeout < 0) {

3570

return NULL((void *)0);

3571

}

3572

3573

if (timeout == 0) {

3574

ts->tv_sec = ts->tv_nsec = 0;

3575

return ts;

3576

}

3577

3578

code = gettimeofday(&now, NULL((void *)0));

3579

if (code) {

3580

Log("Error %d from gettimeofday, falling back to 'forever' timeout\n", errno(* __error()));

3581

return NULL((void *)0);

3582

}

3583

3584

ts->tv_sec = now.tv_sec + timeout;

3585

ts->tv_nsec = now.tv_usec * 1000;

3586

3587

return ts;

3588

}

3589

3590

/**

3591

* Initialize the shutdown_timeout global.

3592

3593

static void

3594

VShutdownTimeoutInit(void)

3595

{

3596

struct timespec *ts;

3597

3598

ts = malloc(sizeof(*ts));

3599

3600

shutdown_timeout = VCalcTimeout(ts, vol_opts.offline_shutdown_timeout);

3601

3602

if (!shutdown_timeout) {

3603

free(ts);

3604

}

3605

}

3606

3607

/**

3608

* Figure out the timeout that should be used for waiting for offline volumes.

3609

3610

* @param[out] ats Storage space for a local timeout value if needed

3611

3612

* @return The timeout value that should be used

3613

* @retval NULL No timeout; wait forever for offlining volumes

3614

* @retval non-NULL A pointer to the absolute time that should be used as

3615

* the deadline for waiting for offlining volumes.

3616

3617

* @note If we return non-NULL, the pointer we return may or may not be the

3618

* same as "ats"

3619

3620

static const struct timespec *

3621

VOfflineTimeout(struct timespec *ats)

3622

{

3623

if (vol_shutting_down) {

3624

osi_Assert(pthread_once(&shutdown_timeout_once, VShutdownTimeoutInit) == 0)(void)((pthread_once(&shutdown_timeout_once, VShutdownTimeoutInit
) == 0) || (osi_AssertFailU("pthread_once(&shutdown_timeout_once, VShutdownTimeoutInit) == 0"
, "./../vol/volume.c", 3624), 0));

3625

return shutdown_timeout;

3626

} else {

3627

return VCalcTimeout(ats, vol_opts.offline_timeout);

3628

}

3629

}

3630

3631

#else /* AFS_PTHREAD_ENV */

3632

3633

/* Waiting a certain amount of time for offlining volumes is not supported

3634

* for LWP due to a lack of primitives. So, we never time out */

3635

# define VTimedOut(x) (0)

3636

# define VOfflineTimeout(x) (NULL((void *)0))

3637

3638

#endif /* !AFS_PTHREAD_ENV */

3639

3640

#if 0

3641

static int

3642

VHold(Volume * vp)

3643

{

3644

int retVal;

3645

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3645), 0));

3646

retVal = VHold_r(vp);

3647

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3647), 0));

3648

return retVal;

3649

}

3650

#endif

3651

3652

static afs_int32

3653

VIsGoingOffline_r(struct Volume *vp)

3654

{

3655

afs_int32 code = 0;

3656

3657

if (vp->goingOffline) {

3658

if (vp->specialStatus) {

3659

code = vp->specialStatus;

3660

} else if (V_inService(vp)((vp)->header->diskstuff.inService) == 0 || V_blessed(vp)((vp)->header->diskstuff.blessed) == 0) {

3661

code = VNOVOL103;

3662

} else {

3663

code = VOFFLINE106;

3664

}

3665

}

3666

3667

return code;

3668

}

3669

3670

/**

3671

* Tell the caller if a volume is waiting to go offline.

3672

3673

* @param[in] vp The volume we want to know about

3674

3675

* @return volume status

3676

* @retval 0 volume is not waiting to go offline, go ahead and use it

3677

* @retval nonzero volume is waiting to offline, and give the returned code

3678

* as an error to anyone accessing the volume

3679

3680

* @pre VOL_LOCK is NOT held

3681

* @pre caller holds a heavyweight reference on vp

3682

3683

afs_int32

3684

VIsGoingOffline(struct Volume *vp)

3685

{

3686

afs_int32 code;

3687

3688

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3688), 0));

3689

code = VIsGoingOffline_r(vp);

3690

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3690), 0));

3691

3692

return code;

3693

}

3694

3695

/**

3696

* Register an RX call with a volume.

3697

3698

* @param[inout] ec Error code; if unset when passed in, may be set if

3699

* the volume starts going offline

3700

* @param[out] client_ec @see GetVolume

3701

* @param[in] vp Volume struct

3702

* @param[in] cbv VCallByVol struct containing the RX call to register

3703

3704

* @pre VOL_LOCK held

3705

* @pre caller holds heavy ref on vp

3706

3707

* @internal

3708

3709

static void

3710

VRegisterCall_r(Errorbit32 *ec, Errorbit32 *client_ec, Volume *vp, struct VCallByVol *cbv)

3711

{

3712

if (vp && cbv) {

3713

#ifdef AFS_DEMAND_ATTACH_FS1

3714

if (!*ec) {

3715

/* just in case the volume started going offline after we got the

3716

* reference to it... otherwise, if the volume started going

3717

* offline right at the end of GetVolume(), we might race with the

3718

* RX call scanner, and return success and add our cbv to the

3719

* rx_call_list _after_ the scanner has scanned the list. */

3720

*ec = VIsGoingOffline_r(vp);

3721

if (client_ec) {

3722

*client_ec = *ec;

3723

}

3724

}

3725

3726

while (V_attachState(vp)((vp)->attach_state) == VOL_STATE_SCANNING_RXCALLS) {

3727

VWaitStateChange_r(vp);

3728

}

3729

#endif /* AFS_DEMAND_ATTACH_FS */

3730

3731

queue_Prepend(&vp->rx_call_list, cbv)(((((struct rx_queue *)(cbv))->next=((struct rx_queue *)(&
vp->rx_call_list))->next)->prev=((struct rx_queue *)
(cbv)))->prev=((struct rx_queue *)(&vp->rx_call_list
)), ((struct rx_queue *)(&vp->rx_call_list))->next=
((struct rx_queue *)(cbv)));

3732

}

3733

}

3734

3735

/**

3736

* Deregister an RX call with a volume.

3737

3738

* @param[in] vp Volume struct

3739

* @param[in] cbv VCallByVol struct containing the RX call to deregister

3740

3741

* @pre VOL_LOCK held

3742

* @pre caller holds heavy ref on vp

3743

3744

* @internal

3745

3746

static void

3747

VDeregisterCall_r(Volume *vp, struct VCallByVol *cbv)

3748

{

3749

if (cbv && queue_IsOnQueue(cbv)(((struct rx_queue *)(cbv))->next != 0)) {

3750

#ifdef AFS_DEMAND_ATTACH_FS1

3751

while (V_attachState(vp)((vp)->attach_state) == VOL_STATE_SCANNING_RXCALLS) {

3752

VWaitStateChange_r(vp);

3753

}

3754

#endif /* AFS_DEMAND_ATTACH_FS */

3755

3756

queue_Remove(cbv)(((((struct rx_queue *)(cbv))->prev->next=((struct rx_queue
*)(cbv))->next)->prev=((struct rx_queue *)(cbv))->prev
), ((struct rx_queue *)(cbv))->next = 0);

3757

}

3758

}

3759

3760

/***************************************************/

3761

/* get and put volume routines */

3762

/***************************************************/

3763

3764

/**

3765

* put back a heavyweight reference to a volume object.

3766

3767

* @param[in] vp volume object pointer

3768

3769

* @pre VOL_LOCK held

3770

3771

* @post heavyweight volume reference put back.

3772

* depending on state, volume may have been taken offline,

3773

* detached, salvaged, freed, etc.

3774

3775

* @internal volume package internal use only

3776

3777

void

3778

VPutVolume_r(Volume * vp)

3779

{

3780

osi_Assert(--vp->nUsers >= 0)(void)((--vp->nUsers >= 0) || (osi_AssertFailU("--vp->nUsers >= 0"
, "./../vol/volume.c", 3780), 0));

3781

if (vp->nUsers == 0) {

3782

VCheckOffline(vp);

3783

ReleaseVolumeHeader(vp->header);

3784

#ifdef AFS_DEMAND_ATTACH_FS1

3785

if (!VCheckDetach(vp)) {

3786

VCheckSalvage(vp);

3787

VCheckFree(vp);

3788

}

3789

#else /* AFS_DEMAND_ATTACH_FS */

3790

VCheckDetach(vp);

3791

#endif /* AFS_DEMAND_ATTACH_FS */

3792

}

3793

}

3794

3795

void

3796

VPutVolume(Volume * vp)

3797

{

3798

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3798), 0));

3799

VPutVolume_r(vp);

3800

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3800), 0));

3801

}

3802

3803

/**

3804

* Puts a volume reference obtained with VGetVolumeWithCall.

3805

3806

* @param[in] vp Volume struct

3807

* @param[in] cbv VCallByVol struct given to VGetVolumeWithCall, or NULL if none

3808

3809

* @pre VOL_LOCK is NOT held

3810

3811

void

3812

VPutVolumeWithCall(Volume *vp, struct VCallByVol *cbv)

3813

{

3814

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3814), 0));

3815

VDeregisterCall_r(vp, cbv);

3816

VPutVolume_r(vp);

3817

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3817), 0));

3818

}

3819

3820

/* Get a pointer to an attached volume. The pointer is returned regardless

3821

of whether or not the volume is in service or on/off line. An error

3822

code, however, is returned with an indication of the volume's status */

3823

Volume *

3824

VGetVolume(Errorbit32 * ec, Errorbit32 * client_ec, VolId volumeId)

3825

{

3826

Volume *retVal;

3827

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3827), 0));

3828

retVal = GetVolume(ec, client_ec, volumeId, NULL((void *)0), 0);

3829

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3829), 0));

3830

return retVal;

3831

}

3832

3833

/**

3834

* Get a volume reference associated with an RX call.

3835

3836

* @param[out] ec @see GetVolume

3837

* @param[out] client_ec @see GetVolume

3838

* @param[in] volumeId @see GetVolume

3839

* @param[in] ts How long to wait for going-offline volumes (absolute time).

3840

* If NULL, wait forever. If ts->tv_sec == 0, return immediately

3841

* with an error if the volume is going offline.

3842

* @param[in] cbv Contains an RX call to be associated with this volume

3843

* reference. This call may be interrupted if the volume is

3844

* requested to go offline while we hold a ref on it. Give NULL

3845

* to not associate an RX call with this reference.

3846

3847

* @return @see GetVolume

3848

3849

* @note for LWP builds, ts must be NULL

3850

3851

* @note A reference obtained with this function MUST be put back with

3852

* VPutVolumeWithCall

3853

3854

Volume *

3855

VGetVolumeWithCall(Errorbit32 * ec, Errorbit32 * client_ec, VolId volumeId,

3856

const struct timespec *ts, struct VCallByVol *cbv)

3857

{

3858

Volume *retVal;

3859

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 3859), 0));

3860

retVal = GetVolume(ec, client_ec, volumeId, NULL((void *)0), ts);

3861

VRegisterCall_r(ec, client_ec, retVal, cbv);

3862

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 3862), 0));

3863

return retVal;

3864

}

3865

3866

Volume *

3867

VGetVolume_r(Errorbit32 * ec, VolId volumeId)

3868

{

3869

return GetVolume(ec, NULL((void *)0), volumeId, NULL((void *)0), NULL((void *)0));

3870

}

3871

3872

/* try to get a volume we've previously looked up */

3873

/* for demand attach fs, caller MUST NOT hold a ref count on vp */

3874

Volume *

3875

VGetVolumeByVp_r(Errorbit32 * ec, Volume * vp)

3876

{

3877

return GetVolume(ec, NULL((void *)0), vp->hashid, vp, NULL((void *)0));

3878

}

3879

3880

/**

3881

* private interface for getting a volume handle

3882

3883

* @param[out] ec error code (0 if no error)

3884

* @param[out] client_ec wire error code to be given to clients

3885

* @param[in] volumeId ID of the volume we want

3886

* @param[in] hint optional hint for hash lookups, or NULL

3887

* @param[in] timeout absolute deadline for waiting for the volume to go

3888

* offline, if it is going offline. NULL to wait forever.

3889

3890

* @return a volume handle for the specified volume

3891

* @retval NULL an error occurred, or the volume is in such a state that

3892

* we cannot load a header or return any volume struct

3893

3894

* @note for DAFS, caller must NOT hold a ref count on 'hint'

3895

3896

* @note 'timeout' is only checked if the volume is actually going offline; so

3897

* if you pass timeout->tv_sec = 0, this will exhibit typical

3898

* nonblocking behavior.

3899

3900

* @note for LWP builds, 'timeout' must be NULL

3901

3902

static Volume *

3903

GetVolume(Errorbit32 * ec, Errorbit32 * client_ec, VolId volumeId, Volume * hint,

3904

const struct timespec *timeout)

3905

{

3906

Volume *vp = hint;

3907

/* pull this profiling/debugging code out of regular builds */

3908

#ifdef notdef

3909

#define VGET_CTR_INC(x) x++

3910

unsigned short V0 = 0, V1 = 0, V2 = 0, V3 = 0, V5 = 0, V6 =

3911

0, V7 = 0, V8 = 0, V9 = 0;

3912

unsigned short V10 = 0, V11 = 0, V12 = 0, V13 = 0, V14 = 0, V15 = 0;

3913

#else

3914

#define VGET_CTR_INC(x)

3915

#endif

3916

#ifdef AFS_DEMAND_ATTACH_FS1

3917

Volume *avp, * rvp = hint;

3918

#endif

3919

3920

3921

* if VInit is zero, the volume package dynamic

3922

* data structures have not been initialized yet,

3923

* and we must immediately return an error

3924

3925

if (VInit == 0) {

3926

vp = NULL((void *)0);

3927

*ec = VOFFLINE106;

3928

if (client_ec) {

3929

*client_ec = VOFFLINE106;

3930

}

3931

goto not_inited;

3932

}

3933

3934

#ifdef AFS_DEMAND_ATTACH_FS1

3935

if (rvp) {

3936

VCreateReservation_r(rvp);

3937

}

3938

#endif /* AFS_DEMAND_ATTACH_FS */

3939

3940

for (;;) {

3941

*ec = 0;

3942

if (client_ec)

3943

*client_ec = 0;

3944

VGET_CTR_INC(V0);

3945

3946

vp = VLookupVolume_r(ec, volumeId, vp);

3947

if (*ec) {

3948

vp = NULL((void *)0);

3949

break;

3950

}

3951

3952

#ifdef AFS_DEMAND_ATTACH_FS1

3953

if (rvp && (rvp != vp)) {

3954

/* break reservation on old vp */

3955

VCancelReservation_r(rvp);

3956

rvp = NULL((void *)0);

3957

}

3958

#endif /* AFS_DEMAND_ATTACH_FS */

3959

3960

if (!vp) {

3961

VGET_CTR_INC(V1);

3962

if (VInit < 2) {

3963

VGET_CTR_INC(V2);

3964

/* Until we have reached an initialization level of 2

3965

* we don't know whether this volume exists or not.

3966

* We can't sleep and retry later because before a volume

3967

* is attached, the caller tries to get it first. Just

3968

* return VOFFLINE and the caller can choose whether to

3969

* retry the command or not. */

3970

*ec = VOFFLINE106;

3971

break;

3972

}

3973

3974

*ec = VNOVOL103;

3975

break;

3976

}

3977

3978

VGET_CTR_INC(V3);

3979

IncUInt64(&VStats.hdr_gets)(*(&VStats.hdr_gets))++;

3980

3981

#ifdef AFS_DEMAND_ATTACH_FS1

3982

/* block if someone else is performing an exclusive op on this volume */

3983

if (rvp != vp) {

3984

rvp = vp;

3985

VCreateReservation_r(rvp);

3986

}

3987

VWaitExclusiveState_r(vp);

3988

3989

/* short circuit with VNOVOL in the following circumstances:

3990

3991

* - VOL_STATE_ERROR

3992

* - VOL_STATE_SHUTTING_DOWN

3993

3994

if ((V_attachState(vp)((vp)->attach_state) == VOL_STATE_ERROR) ||

3995

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_SHUTTING_DOWN) ||

3996

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_GOING_OFFLINE)) {

3997

*ec = VNOVOL103;

3998

vp = NULL((void *)0);

3999

break;

4000

}

4001

4002

4003

* short circuit with VOFFLINE for VOL_STATE_UNATTACHED and

4004

* VNOVOL for VOL_STATE_DELETED

4005

4006

if ((V_attachState(vp)((vp)->attach_state) == VOL_STATE_UNATTACHED) ||

4007

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_DELETED)) {

4008

if (vp->specialStatus) {

4009

*ec = vp->specialStatus;

4010

} else if (V_attachState(vp)((vp)->attach_state) == VOL_STATE_DELETED) {

4011

*ec = VNOVOL103;

4012

} else {

4013

*ec = VOFFLINE106;

4014

}

4015

vp = NULL((void *)0);

4016

break;

4017

}

4018

4019

/* allowable states:

4020

* - PREATTACHED

4021

* - ATTACHED

4022

* - SALVAGING

4023

* - SALVAGE_REQ

4024

4025

4026

if (vp->salvage.requested) {

4027

VUpdateSalvagePriority_r(vp);

4028

}

4029

4030

if (V_attachState(vp)((vp)->attach_state) == VOL_STATE_PREATTACHED) {

4031

if (vp->specialStatus) {

4032

*ec = vp->specialStatus;

4033

vp = NULL((void *)0);

4034

break;

4035

}

4036

avp = VAttachVolumeByVp_r(ec, vp, 0);

4037

if (avp) {

4038

if (vp != avp) {

4039

/* VAttachVolumeByVp_r can return a pointer

4040

* != the vp passed to it under certain

4041

* conditions; make sure we don't leak

4042

* reservations if that happens */

4043

vp = avp;

4044

VCancelReservation_r(rvp);

4045

rvp = avp;

4046

VCreateReservation_r(rvp);

4047

}

4048

VPutVolume_r(avp);

4049

}

4050

if (*ec) {

4051

int endloop = 0;

4052

switch (*ec) {

4053

case VSALVAGING113:

4054

break;

4055

case VOFFLINE106:

4056

if (!vp->pending_vol_op) {

4057

endloop = 1;

4058

}

4059

break;

4060

default:

4061

*ec = VNOVOL103;

4062

endloop = 1;

4063

}

4064

if (endloop) {

4065

vp = NULL((void *)0);

4066

break;

4067

}

4068

}

4069

}

4070

4071

if (VIsSalvaging(vp) || (*ec == VSALVAGING113)) {

4072

if (client_ec) {

4073

/* see CheckVnode() in afsfileprocs.c for an explanation

4074

* of this error code logic */

4075

afs_uint32 now = FT_ApproxTime();

4076

if ((vp->stats.last_salvage + (10 * 60)) >= now) {

4077

*client_ec = VBUSY110;

4078

} else {

4079

*client_ec = VRESTARTING-100;

4080

}

4081

}

4082

*ec = VSALVAGING113;

4083

vp = NULL((void *)0);

4084

break;

4085

}

4086

#endif

4087

4088

#ifdef AFS_DEMAND_ATTACH_FS1

4089

4090

* this test MUST happen after VAttachVolymeByVp, so vol_op_state is

4091

* not VolOpRunningUnknown (attach2 would have converted it to Online

4092

* or Offline)

4093

4094

4095

/* only valid before/during demand attachment */

4096

osi_Assert(!vp->pending_vol_op || vp->pending_vol_op->vol_op_state != FSSYNC_VolOpRunningUnknown)(void)((!vp->pending_vol_op || vp->pending_vol_op->vol_op_state
!= FSSYNC_VolOpRunningUnknown) || (osi_AssertFailU("!vp->pending_vol_op || vp->pending_vol_op->vol_op_state != FSSYNC_VolOpRunningUnknown"
, "./../vol/volume.c", 4096), 0));

4097

4098

/* deny getvolume due to running mutually exclusive vol op */

4099

if (vp->pending_vol_op && vp->pending_vol_op->vol_op_state==FSSYNC_VolOpRunningOffline) {

4100

4101

* volume cannot remain online during this volume operation.

4102

* notify client.

4103

4104

if (vp->specialStatus) {

4105

4106

* special status codes outrank normal VOFFLINE code

4107

4108

*ec = vp->specialStatus;

4109

if (client_ec) {

4110

*client_ec = vp->specialStatus;

4111

}

4112

} else {

4113

if (client_ec) {

4114

/* see CheckVnode() in afsfileprocs.c for an explanation

4115

* of this error code logic */

4116

afs_uint32 now = FT_ApproxTime();

4117

if ((vp->stats.last_vol_op + (10 * 60)) >= now) {

4118

*client_ec = VBUSY110;

4119

} else {

4120

*client_ec = VRESTARTING-100;

4121

}

4122

}

4123

*ec = VOFFLINE106;

4124

}

4125

VChangeState_r(vp, VOL_STATE_UNATTACHED);

4126

FreeVolumeHeader(vp);

4127

vp = NULL((void *)0);

4128

break;

4129

}

4130

#endif /* AFS_DEMAND_ATTACH_FS */

4131

4132

LoadVolumeHeader(ec, vp);

4133

if (*ec) {

4134

VGET_CTR_INC(V6);

4135

/* Only log the error if it was a totally unexpected error. Simply

4136

* a missing inode is likely to be caused by the volume being deleted */

4137

if (errno(* __error()) != ENXIO6 || LogLevel)

4138

Log("Volume %u: couldn't reread volume header\n",

4139

vp->hashid);

4140

#ifdef AFS_DEMAND_ATTACH_FS1

4141

if (VCanScheduleSalvage()) {

4142

VRequestSalvage_r(ec, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, VOL_SALVAGE_INVALIDATE_HEADER0x1);

4143

} else {

4144

FreeVolume(vp);

4145

vp = NULL((void *)0);

4146

}

4147

#else /* AFS_DEMAND_ATTACH_FS */

4148

FreeVolume(vp);

4149

vp = NULL((void *)0);

4150

#endif /* AFS_DEMAND_ATTACH_FS */

4151

break;

4152

}

4153

4154

VGET_CTR_INC(V7);

4155

if (vp->shuttingDown) {

4156

VGET_CTR_INC(V8);

4157

*ec = VNOVOL103;

4158

vp = NULL((void *)0);

4159

break;

4160

}

4161

4162

if (programType == fileServer) {

4163

VGET_CTR_INC(V9);

4164

if (vp->goingOffline) {

4165

if (timeout && VTimedOut(timeout)) {

4166

/* we've timed out; don't wait for the vol */

4167

} else {

4168

VGET_CTR_INC(V10);

4169

#ifdef AFS_DEMAND_ATTACH_FS1

4170

/* wait for the volume to go offline */

4171

if (V_attachState(vp)((vp)->attach_state) == VOL_STATE_GOING_OFFLINE) {

4172

VTimedWaitStateChange_r(vp, timeout, NULL((void *)0));

4173

}

4174

#elif defined(AFS_PTHREAD_ENV1)

4175

VOL_CV_TIMEDWAIT(&vol_put_volume_cond, timeout, NULL((void *)0));

4176

#else /* AFS_PTHREAD_ENV */

4177

/* LWP has no timed wait, so the caller better not be

4178

* expecting one */

4179

osi_Assert(!timeout)(void)((!timeout) || (osi_AssertFailU("!timeout", "./../vol/volume.c"
, 4179), 0));

4180

LWP_WaitProcess(VPutVolume);

4181

#endif /* AFS_PTHREAD_ENV */

4182

continue;

4183

}

4184

}

4185

if (vp->specialStatus) {

4186

VGET_CTR_INC(V11);

4187

*ec = vp->specialStatus;

4188

} else if (V_inService(vp)((vp)->header->diskstuff.inService) == 0 || V_blessed(vp)((vp)->header->diskstuff.blessed) == 0) {

4189

VGET_CTR_INC(V12);

4190

*ec = VNOVOL103;

4191

} else if (V_inUse(vp)((vp)->header->diskstuff.inUse) == 0 || vp->goingOffline) {

4192

VGET_CTR_INC(V13);

4193

*ec = VOFFLINE106;

4194

} else {

4195

VGET_CTR_INC(V14);

4196

}

4197

}

4198

break;

4199

}

4200

VGET_CTR_INC(V15);

4201

4202

#ifdef AFS_DEMAND_ATTACH_FS1

4203

/* if no error, bump nUsers */

4204

if (vp) {

4205

vp->nUsers++;

4206

VLRU_UpdateAccess_r(vp);

4207

}

4208

if (rvp) {

4209

VCancelReservation_r(rvp);

4210

rvp = NULL((void *)0);

4211

}

4212

if (client_ec && !*client_ec) {

4213

*client_ec = *ec;

4214

}

4215

#else /* AFS_DEMAND_ATTACH_FS */

4216

/* if no error, bump nUsers */

4217

if (vp) {

4218

vp->nUsers++;

4219

}

4220

if (client_ec) {

4221

*client_ec = *ec;

4222

}

4223

#endif /* AFS_DEMAND_ATTACH_FS */

4224

4225

not_inited:

4226

osi_Assert(vp || *ec)(void)((vp || *ec) || (osi_AssertFailU("vp || *ec", "./../vol/volume.c"
, 4226), 0));

4227

return vp;

4228

}

4229

4230

4231

/***************************************************/

4232

/* Volume offline/detach routines */

4233

/***************************************************/

4234

4235

/* caller MUST hold a heavyweight ref on vp */

4236

#ifdef AFS_DEMAND_ATTACH_FS1

4237

void

4238

VTakeOffline_r(Volume * vp)

4239

{

4240

Errorbit32 error;

4241

4242

osi_Assert(vp->nUsers > 0)(void)((vp->nUsers > 0) || (osi_AssertFailU("vp->nUsers > 0"
, "./../vol/volume.c", 4242), 0));

4243

osi_Assert(programType == fileServer)(void)((programType == fileServer) || (osi_AssertFailU("programType == fileServer"
, "./../vol/volume.c", 4243), 0));

4244

4245

VCreateReservation_r(vp);

4246

VWaitExclusiveState_r(vp);

4247

4248

vp->goingOffline = 1;

4249

V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged) = 1;

4250

4251

VRequestSalvage_r(&error, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, 0);

4252

VCancelReservation_r(vp);

4253

}

4254

#else /* AFS_DEMAND_ATTACH_FS */

4255

void

4256

VTakeOffline_r(Volume * vp)

4257

{

4258

osi_Assert(vp->nUsers > 0)(void)((vp->nUsers > 0) || (osi_AssertFailU("vp->nUsers > 0"
, "./../vol/volume.c", 4258), 0));

4259

osi_Assert(programType == fileServer)(void)((programType == fileServer) || (osi_AssertFailU("programType == fileServer"
, "./../vol/volume.c", 4259), 0));

4260

4261

vp->goingOffline = 1;

4262

V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged) = 1;

4263

}

4264

#endif /* AFS_DEMAND_ATTACH_FS */

4265

4266

void

4267

VTakeOffline(Volume * vp)

4268

{

4269

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4269), 0));

4270

VTakeOffline_r(vp);

4271

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4271), 0));

4272

}

4273

4274

/**

4275

* force a volume offline.

4276

4277

* @param[in] vp volume object pointer

4278

* @param[in] flags flags (see note below)

4279

4280

* @note the flag VOL_FORCEOFF_NOUPDATE is a recursion control flag

4281

* used when VUpdateVolume_r needs to call VForceOffline_r

4282

* (which in turn would normally call VUpdateVolume_r)

4283

4284

* @see VUpdateVolume_r

4285

4286

* @pre VOL_LOCK must be held.

4287

* for DAFS, caller must hold ref.

4288

4289

* @note for DAFS, it _is safe_ to call this function from an

4290

* exclusive state

4291

4292

* @post needsSalvaged flag is set.

4293

* for DAFS, salvage is requested.

4294

* no further references to the volume through the volume

4295

* package will be honored.

4296

* all file descriptor and vnode caches are invalidated.

4297

4298

* @warning this is a heavy-handed interface. it results in

4299

* a volume going offline regardless of the current

4300

* reference count state.

4301

4302

* @internal volume package internal use only

4303

4304

void

4305

VForceOffline_r(Volume * vp, int flags)

4306

{

4307

Errorbit32 error;

4308

if (!V_inUse(vp)((vp)->header->diskstuff.inUse)) {

4309

#ifdef AFS_DEMAND_ATTACH_FS1

4310

VChangeState_r(vp, VOL_STATE_ERROR);

4311

#endif

4312

return;

4313

}

4314

4315

strcpy(V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage),

4316

"Forced offline due to internal error: volume needs to be salvaged");

4317

Log("Volume %u forced offline: it needs salvaging!\n", V_id(vp)((vp)->header->diskstuff.id));

4318

4319

V_inUse(vp)((vp)->header->diskstuff.inUse) = 0;

4320

vp->goingOffline = 0;

4321

V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged) = 1;

4322

if (!(flags & VOL_FORCEOFF_NOUPDATE0x1)) {

4323

VUpdateVolume_r(&error, vp, VOL_UPDATE_NOFORCEOFF0x2);

4324

}

4325

4326

#ifdef AFS_DEMAND_ATTACH_FS1

4327

VRequestSalvage_r(&error, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, VOL_SALVAGE_INVALIDATE_HEADER0x1);

4328

#endif /* AFS_DEMAND_ATTACH_FS */

4329

4330

#ifdef AFS_PTHREAD_ENV1

4331

CV_BROADCAST(&vol_put_volume_cond)(void)((pthread_cond_broadcast(&vol_put_volume_cond) == 0
) || (osi_AssertFailU("pthread_cond_broadcast(&vol_put_volume_cond) == 0"
, "./../vol/volume.c", 4331), 0));

4332

#else /* AFS_PTHREAD_ENV */

4333

LWP_NoYieldSignal(VPutVolume);

4334

#endif /* AFS_PTHREAD_ENV */

4335

4336

VReleaseVolumeHandles_r(vp);

4337

}

4338

4339

/**

4340

* force a volume offline.

4341

4342

* @param[in] vp volume object pointer

4343

4344

* @see VForceOffline_r

4345

4346

void

4347

VForceOffline(Volume * vp)

4348

{

4349

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4349), 0));

4350

VForceOffline_r(vp, 0);

4351

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4351), 0));

4352

}

4353

4354

/**

4355

* Iterate over the RX calls associated with a volume, and interrupt them.

4356

4357

* @param[in] vp The volume whose RX calls we want to scan

4358

4359

* @pre VOL_LOCK held

4360

4361

static void

4362

VScanCalls_r(struct Volume *vp)

4363

{

4364

struct VCallByVol *cbv, *ncbv;

4365

afs_int32 err;

4366

#ifdef AFS_DEMAND_ATTACH_FS1

4367

VolState state_save;

4368

#endif

4369

4370

if (queue_IsEmpty(&vp->rx_call_list)(((struct rx_queue *)(&vp->rx_call_list))->next == (
(struct rx_queue *)(&vp->rx_call_list))))

4371

return; /* no calls to interrupt */

4372

if (!vol_opts.interrupt_rxcall)

4373

return; /* we have no function with which to interrupt calls */

4374

err = VIsGoingOffline_r(vp);

4375

if (!err)

4376

return; /* we're not going offline anymore */

4377

4378

#ifdef AFS_DEMAND_ATTACH_FS1

4379

VWaitExclusiveState_r(vp);

4380

state_save = VChangeState_r(vp, VOL_STATE_SCANNING_RXCALLS);

4381

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4381), 0));

4382

#endif /* AFS_DEMAND_ATTACH_FS */

4383

4384

for(queue_Scan(&vp->rx_call_list, cbv, ncbv, VCallByVol)(cbv) = ((struct VCallByVol *)((struct rx_queue *)(&vp->
rx_call_list))->next), ncbv = ((struct VCallByVol *)((struct
rx_queue *)(cbv))->next); !(((struct rx_queue *)(&vp->
rx_call_list)) == ((struct rx_queue *)(cbv))); (cbv) = (ncbv)
, ncbv = ((struct VCallByVol *)((struct rx_queue *)(cbv))->
next)) {

4385

if (LogLevel > 0) {

4386

struct rx_peer *peer;

4387

char hoststr[16];

4388

peer = rx_PeerOf(rx_ConnectionOf(cbv->call))((((cbv->call)->conn))->peer);

4389

4390

Log("Offlining volume %lu while client %s:%u is trying to read "

4391

"from it; kicking client off with error %ld\n",

4392

(long unsigned) vp->hashid,

4393

afs_inet_ntoa_r(rx_HostOf(peer)((peer)->host), hoststr),

4394

(unsigned) ntohs(rx_PortOf(peer))(__builtin_constant_p(((peer)->port)) ? (__uint16_t)(((__uint16_t
)(((peer)->port))) << 8 | ((__uint16_t)(((peer)->
port))) >> 8) : __bswap16_var(((peer)->port))),

4395

(long) err);

4396

}

4397

(*vol_opts.interrupt_rxcall) (cbv->call, err);

4398

}

4399

4400

#ifdef AFS_DEMAND_ATTACH_FS1

4401

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4401), 0));

4402

VChangeState_r(vp, state_save);

4403

#endif /* AFS_DEMAND_ATTACH_FS */

4404

}

4405

4406

#ifdef AFS_DEMAND_ATTACH_FS1

4407

/**

4408

* Wait for a vp to go offline.

4409

4410

* @param[out] ec 1 if a salvage on the volume has been requested and

4411

* salvok == 0, 0 otherwise

4412

* @param[in] vp The volume to wait for

4413

* @param[in] salvok If 0, we return immediately with *ec = 1 if the volume

4414

* has been requested to salvage. Otherwise we keep waiting

4415

* until the volume has gone offline.

4416

4417

* @pre VOL_LOCK held

4418

* @pre caller holds a lightweight ref on vp

4419

4420

* @note DAFS only

4421

4422

static void

4423

VWaitForOfflineByVp_r(Errorbit32 *ec, struct Volume *vp, int salvok)

4424

{

4425

struct timespec timeout_ts;

4426

const struct timespec *ts;

4427

int timedout = 0;

4428

4429

ts = VOfflineTimeout(&timeout_ts);

4430

4431

*ec = 0;

4432

4433

while (!VIsOfflineState(V_attachState(vp)((vp)->attach_state)) && !timedout) {

4434

if (!salvok && vp->salvage.requested) {

4435

*ec = 1;

4436

return;

4437

}

4438

VTimedWaitStateChange_r(vp, ts, &timedout);

4439

}

4440

if (!timedout) {

4441

/* we didn't time out, so the volume must be offline, so we're done */

4442

return;

4443

}

4444

4445

/* If we got here, we timed out waiting for the volume to go offline.

4446

* Kick off the accessing RX calls and wait again */

4447

4448

VScanCalls_r(vp);

4449

4450

while (!VIsOfflineState(V_attachState(vp)((vp)->attach_state))) {

4451

if (!salvok && vp->salvage.requested) {

4452

*ec = 1;

4453

return;

4454

}

4455

4456

VWaitStateChange_r(vp);

4457

}

4458

}

4459

4460

#else /* AFS_DEMAND_ATTACH_FS */

4461

4462

/**

4463

* Wait for a volume to go offline.

4464

4465

* @pre VOL_LOCK held

4466

4467

* @note non-DAFS only (for DAFS, use @see WaitForOfflineByVp_r)

4468

4469

static void

4470

VWaitForOffline_r(Errorbit32 *ec, VolumeId volid)

4471

{

4472

struct Volume *vp;

4473

const struct timespec *ts;

4474

#ifdef AFS_PTHREAD_ENV1

4475

struct timespec timeout_ts;

4476

#endif

4477

4478

ts = VOfflineTimeout(&timeout_ts);

4479

4480

vp = GetVolume(ec, NULL((void *)0), volid, NULL((void *)0), ts);

4481

if (!vp) {

4482

/* error occurred so bad that we can't even get a vp; we have no

4483

* information on the vol so we don't know whether to wait, so just

4484

* return */

4485

return;

4486

}

4487

if (!VIsGoingOffline_r(vp)) {

4488

/* volume is no longer going offline, so we're done */

4489

VPutVolume_r(vp);

4490

return;

4491

}

4492

4493

/* If we got here, we timed out waiting for the volume to go offline.

4494

* Kick off the accessing RX calls and wait again */

4495

4496

VScanCalls_r(vp);

4497

VPutVolume_r(vp);

4498

vp = NULL((void *)0);

4499

4500

vp = VGetVolume_r(ec, volid);

4501

if (vp) {

4502

/* In case it was reattached... */

4503

VPutVolume_r(vp);

4504

}

4505

}

4506

#endif /* !AFS_DEMAND_ATTACH_FS */

4507

4508

/* The opposite of VAttachVolume. The volume header is written to disk, with

4509

the inUse bit turned off. A copy of the header is maintained in memory,

4510

however (which is why this is VOffline, not VDetach).

4511

4512

void

4513

VOffline_r(Volume * vp, char *message)

4514

{

4515

Errorbit32 error;

4516

#ifndef AFS_DEMAND_ATTACH_FS1

4517

VolumeId vid = V_id(vp)((vp)->header->diskstuff.id);

4518

#endif

4519

4520

osi_Assert(programType != volumeUtility && programType != volumeServer)(void)((programType != volumeUtility && programType !=
volumeServer) || (osi_AssertFailU("programType != volumeUtility && programType != volumeServer"
, "./../vol/volume.c", 4520), 0));

4521

if (!V_inUse(vp)((vp)->header->diskstuff.inUse)) {

4522

VPutVolume_r(vp);

4523

return;

4524

}

4525

if (V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)[0] == '\0')

4526

strncpy(V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage), message, sizeof(V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)));

4527

V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)[sizeof(V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)) - 1] = '\0';

4528

4529

vp->goingOffline = 1;

4530

#ifdef AFS_DEMAND_ATTACH_FS1

4531

VChangeState_r(vp, VOL_STATE_GOING_OFFLINE);

4532

VCreateReservation_r(vp);

4533

VPutVolume_r(vp);

4534

VWaitForOfflineByVp_r(&error, vp, 1);

4535

VCancelReservation_r(vp);

4536

#else /* AFS_DEMAND_ATTACH_FS */

4537

VPutVolume_r(vp);

4538

VWaitForOffline_r(&error, vid);

4539

#endif /* AFS_DEMAND_ATTACH_FS */

4540

}

4541

4542

#ifdef AFS_DEMAND_ATTACH_FS1

4543

/**

4544

* Take a volume offline in order to perform a volume operation.

4545

4546

* @param[inout] ec address in which to store error code

4547

* @param[in] vp volume object pointer

4548

* @param[in] message volume offline status message

4549

4550

* @pre

4551

* - VOL_LOCK is held

4552

* - caller MUST hold a heavyweight ref on vp

4553

4554

* @post

4555

* - volume is taken offline

4556

* - if possible, volume operation is promoted to running state

4557

* - on failure, *ec is set to nonzero

4558

4559

* @note Although this function does not return any value, it may

4560

* still fail to promote our pending volume operation to

4561

* a running state. Any caller MUST check the value of *ec,

4562

* and MUST NOT blindly assume success.

4563

4564

* @warning if the caller does not hold a lightweight ref on vp,

4565

* then it MUST NOT reference vp after this function

4566

* returns to the caller.

4567

4568

* @internal volume package internal use only

4569

4570

void

4571

VOfflineForVolOp_r(Errorbit32 *ec, Volume *vp, char *message)

4572

{

4573

int salvok = 1;

4574

osi_Assert(vp->pending_vol_op)(void)((vp->pending_vol_op) || (osi_AssertFailU("vp->pending_vol_op"
, "./../vol/volume.c", 4574), 0));

4575

if (!V_inUse(vp)((vp)->header->diskstuff.inUse)) {

4576

VPutVolume_r(vp);

4577

*ec = 1;

4578

return;

4579

}

4580

if (V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)[0] == '\0')

4581

strncpy(V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage), message, sizeof(V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)));

4582

V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)[sizeof(V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)) - 1] = '\0';

4583

4584

vp->goingOffline = 1;

4585

VChangeState_r(vp, VOL_STATE_GOING_OFFLINE);

4586

VCreateReservation_r(vp);

4587

VPutVolume_r(vp);

4588

4589

if (vp->pending_vol_op->com.programType != salvageServer) {

4590

/* do not give corrupted volumes to the volserver */

4591

salvok = 0;

4592

}

4593

4594

*ec = 0;

4595

VWaitForOfflineByVp_r(ec, vp, salvok);

4596

4597

VCancelReservation_r(vp);

4598

}

4599

#endif /* AFS_DEMAND_ATTACH_FS */

4600

4601

void

4602

VOffline(Volume * vp, char *message)

4603

{

4604

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4604), 0));

4605

VOffline_r(vp, message);

4606

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4606), 0));

4607

}

4608

4609

/* This gets used for the most part by utility routines that don't want

4610

* to keep all the volume headers around. Generally, the file server won't

4611

* call this routine, because then the offline message in the volume header

4612

* (or other information) won't be available to clients. For NAMEI, also

4613

* close the file handles. However, the fileserver does call this during

4614

* an attach following a volume operation.

4615

4616

void

4617

VDetachVolume_r(Errorbit32 * ec, Volume * vp)

4618

{

4619

#ifdef FSSYNC_BUILD_CLIENT

4620

VolumeId volume;

4621

struct DiskPartition64 *tpartp;

4622

int notifyServer = 0;

4623

int useDone = FSYNC_VOL_ON;

4624

4625

if (VCanUseFSSYNC()) {

4626

notifyServer = vp->needsPutBack;

4627

if (V_destroyMe(vp)((vp)->header->diskstuff.destroyMe) == DESTROY_ME0xD3)

4628

useDone = FSYNC_VOL_LEAVE_OFF;

4629

# ifdef AFS_DEMAND_ATTACH_FS1

4630

else if (!V_blessed(vp)((vp)->header->diskstuff.blessed) || !V_inService(vp)((vp)->header->diskstuff.inService))

4631

useDone = FSYNC_VOL_LEAVE_OFF;

4632

# endif

4633

}

4634

# ifdef AFS_DEMAND_ATTACH_FS1

4635

if (V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged)) {

4636

notifyServer = 0;

4637

VRequestSalvage_r(ec, vp, SALVSYNC_NEEDEDSALVSYNC_REASON_NEEDED, 0);

4638

}

4639

# endif

4640

tpartp = vp->partition;

4641

volume = V_id(vp)((vp)->header->diskstuff.id);

4642

#endif /* FSSYNC_BUILD_CLIENT */

4643

4644

*ec = 0; /* always "succeeds" */

4645

DeleteVolumeFromHashTable(vp);

4646

vp->shuttingDown = 1;

4647

#ifdef AFS_DEMAND_ATTACH_FS1

4648

DeleteVolumeFromVByPList_r(vp);

4649

VLRU_Delete_r(vp);

4650

VChangeState_r(vp, VOL_STATE_SHUTTING_DOWN);

4651

#else

4652

if (programType != fileServer)

4653

V_inUse(vp)((vp)->header->diskstuff.inUse) = 0;

4654

#endif /* AFS_DEMAND_ATTACH_FS */

4655

VPutVolume_r(vp);

4656

/* Will be detached sometime in the future--this is OK since volume is offline */

4657

4658

/* XXX the following code should really be moved to VCheckDetach() since the volume

4659

* is not technically detached until the refcounts reach zero

4660

4661

#ifdef FSSYNC_BUILD_CLIENT

4662

if (VCanUseFSSYNC() && notifyServer) {

4663

if (notifyServer == VOL_PUTBACK_DELETE2) {

4664

/* Only send FSYNC_VOL_DONE if the volume was actually deleted.

4665

* volserver code will set needsPutBack to VOL_PUTBACK_DELETE

4666

* to signify a deleted volume. */

4667

useDone = FSYNC_VOL_DONE;

4668

}

4669

4670

* Note: The server is not notified in the case of a bogus volume

4671

* explicitly to make it possible to create a volume, do a partial

4672

* restore, then abort the operation without ever putting the volume

4673

* online. This is essential in the case of a volume move operation

4674

* between two partitions on the same server. In that case, there

4675

* would be two instances of the same volume, one of them bogus,

4676

* which the file server would attempt to put on line

4677

4678

FSYNC_VolOp(volume, tpartp->name, useDone, 0, NULL((void *)0));

4679

/* XXX this code path is only hit by volume utilities, thus

4680

* V_BreakVolumeCallbacks will always be NULL. if we really

4681

* want to break callbacks in this path we need to use FSYNC_VolOp() */

4682

#ifdef notdef

4683

/* Dettaching it so break all callbacks on it */

4684

if (V_BreakVolumeCallbacks) {

4685

Log("volume %u detached; breaking all call backs\n", volume);

4686

(*V_BreakVolumeCallbacks) (volume);

4687

}

4688

#endif

4689

}

4690

#endif /* FSSYNC_BUILD_CLIENT */

4691

}

4692

4693

void

4694

VDetachVolume(Errorbit32 * ec, Volume * vp)

4695

{

4696

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4696), 0));

4697

VDetachVolume_r(ec, vp);

4698

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4698), 0));

4699

}

4700

4701

4702

/***************************************************/

4703

/* Volume fd/inode handle closing routines */

4704

/***************************************************/

4705

4706

/* For VDetachVolume, we close all cached file descriptors, but keep

4707

* the Inode handles in case we need to read from a busy volume.

4708

4709

/* for demand attach, caller MUST hold ref count on vp */

4710

static void

4711

VCloseVolumeHandles_r(Volume * vp)

4712

{

4713

#ifdef AFS_DEMAND_ATTACH_FS1

4714

VolState state_save;

4715

4716

state_save = VChangeState_r(vp, VOL_STATE_OFFLINING);

4717

4718

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4718), 0));

4719

#endif

4720

4721

DFlushVolume(vp->hashid);

4722

4723

#ifdef AFS_DEMAND_ATTACH_FS1

4724

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4724), 0));

4725

#endif

4726

4727

/* DAFS: VCloseVnodeFiles_r drops the glock internally */

4728

VCloseVnodeFiles_r(vp);

4729

4730

#ifdef AFS_DEMAND_ATTACH_FS1

4731

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4731), 0));

4732

#endif

4733

4734

/* Too time consuming and unnecessary for the volserver */

4735

if (programType == fileServer) {

4736

IH_CONDSYNC(vp->vnodeIndex[vLarge].handle)ih_condsync(vp->vnodeIndex[0].handle);

4737

IH_CONDSYNC(vp->vnodeIndex[vSmall].handle)ih_condsync(vp->vnodeIndex[1].handle);

4738

IH_CONDSYNC(vp->diskDataHandle)ih_condsync(vp->diskDataHandle);

4739

#ifdef AFS_NT40_ENV

4740

IH_CONDSYNC(vp->linkHandle)ih_condsync(vp->linkHandle);

4741

#endif /* AFS_NT40_ENV */

4742

}

4743

4744

IH_REALLYCLOSE(vp->vnodeIndex[vLarge].handle)ih_reallyclose(vp->vnodeIndex[0].handle);

4745

IH_REALLYCLOSE(vp->vnodeIndex[vSmall].handle)ih_reallyclose(vp->vnodeIndex[1].handle);

4746

IH_REALLYCLOSE(vp->diskDataHandle)ih_reallyclose(vp->diskDataHandle);

4747

IH_REALLYCLOSE(vp->linkHandle)ih_reallyclose(vp->linkHandle);

4748

4749

#ifdef AFS_DEMAND_ATTACH_FS1

4750

if ((V_attachFlags(vp)((vp)->attach_flags) & VOL_LOCKED)) {

4751

VUnlockVolume(vp);

4752

}

4753

4754

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4754), 0));

4755

VChangeState_r(vp, state_save);

4756

#endif

4757

}

4758

4759

/* For both VForceOffline and VOffline, we close all relevant handles.

4760

* For VOffline, if we re-attach the volume, the files may possible be

4761

* different than before.

4762

4763

/* for demand attach, caller MUST hold a ref count on vp */

4764

static void

4765

VReleaseVolumeHandles_r(Volume * vp)

4766

{

4767

#ifdef AFS_DEMAND_ATTACH_FS1

4768

VolState state_save;

4769

4770

state_save = VChangeState_r(vp, VOL_STATE_DETACHING);

4771

4772

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4772), 0));

4773

#endif

4774

4775

DFlushVolume(vp->hashid);

4776

4777

#ifdef AFS_DEMAND_ATTACH_FS1

4778

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4778), 0));

4779

#endif

4780

4781

VReleaseVnodeFiles_r(vp); /* DAFS: releases the glock internally */

4782

4783

#ifdef AFS_DEMAND_ATTACH_FS1

4784

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4784), 0));

4785

#endif

4786

4787

/* Too time consuming and unnecessary for the volserver */

4788

if (programType == fileServer) {

4789

IH_CONDSYNC(vp->vnodeIndex[vLarge].handle)ih_condsync(vp->vnodeIndex[0].handle);

4790

IH_CONDSYNC(vp->vnodeIndex[vSmall].handle)ih_condsync(vp->vnodeIndex[1].handle);

4791

IH_CONDSYNC(vp->diskDataHandle)ih_condsync(vp->diskDataHandle);

4792

#ifdef AFS_NT40_ENV

4793

IH_CONDSYNC(vp->linkHandle)ih_condsync(vp->linkHandle);

4794

#endif /* AFS_NT40_ENV */

4795

}

4796

4797

IH_RELEASE(vp->vnodeIndex[vLarge].handle)(ih_release(vp->vnodeIndex[0].handle), (vp->vnodeIndex[
0].handle)=((void *)0), 0);

4798

IH_RELEASE(vp->vnodeIndex[vSmall].handle)(ih_release(vp->vnodeIndex[1].handle), (vp->vnodeIndex[
1].handle)=((void *)0), 0);

4799

IH_RELEASE(vp->diskDataHandle)(ih_release(vp->diskDataHandle), (vp->diskDataHandle)=(
(void *)0), 0);

4800

IH_RELEASE(vp->linkHandle)(ih_release(vp->linkHandle), (vp->linkHandle)=((void *)
0), 0);

4801

4802

#ifdef AFS_DEMAND_ATTACH_FS1

4803

if ((V_attachFlags(vp)((vp)->attach_flags) & VOL_LOCKED)) {

4804

VUnlockVolume(vp);

4805

}

4806

4807

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4807), 0));

4808

VChangeState_r(vp, state_save);

4809

#endif

4810

}

4811

4812

4813

/***************************************************/

4814

/* Volume write and fsync routines */

4815

/***************************************************/

4816

4817

void

4818

VUpdateVolume_r(Errorbit32 * ec, Volume * vp, int flags)

4819

{

4820

#ifdef AFS_DEMAND_ATTACH_FS1

4821

VolState state_save;

4822

4823

if (flags & VOL_UPDATE_WAIT0x1) {

4824

VCreateReservation_r(vp);

4825

VWaitExclusiveState_r(vp);

4826

}

4827

#endif

4828

4829

*ec = 0;

4830

if (programType == fileServer)

4831

V_uniquifier(vp)((vp)->header->diskstuff.uniquifier) =

4832

(V_inUse(vp)((vp)->header->diskstuff.inUse) ? V_nextVnodeUnique(vp)((vp)->nextVnodeUnique) +

4833

200 : V_nextVnodeUnique(vp)((vp)->nextVnodeUnique));

4834

4835

#ifdef AFS_DEMAND_ATTACH_FS1

4836

state_save = VChangeState_r(vp, VOL_STATE_UPDATING);

4837

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4837), 0));

4838

#endif

4839

4840

WriteVolumeHeader_r(ec, vp);

4841

4842

#ifdef AFS_DEMAND_ATTACH_FS1

4843

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4843), 0));

4844

VChangeState_r(vp, state_save);

4845

if (flags & VOL_UPDATE_WAIT0x1) {

4846

VCancelReservation_r(vp);

4847

}

4848

#endif

4849

4850

if (*ec) {

4851

Log("VUpdateVolume: error updating volume header, volume %u (%s)\n",

4852

V_id(vp)((vp)->header->diskstuff.id), V_name(vp)((vp)->header->diskstuff.name));

4853

/* try to update on-disk header,

4854

* while preventing infinite recursion */

4855

if (!(flags & VOL_UPDATE_NOFORCEOFF0x2)) {

4856

VForceOffline_r(vp, VOL_FORCEOFF_NOUPDATE0x1);

4857

}

4858

}

4859

}

4860

4861

void

4862

VUpdateVolume(Errorbit32 * ec, Volume * vp)

4863

{

4864

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4864), 0));

4865

VUpdateVolume_r(ec, vp, VOL_UPDATE_WAIT0x1);

4866

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4866), 0));

4867

}

4868

4869

void

4870

VSyncVolume_r(Errorbit32 * ec, Volume * vp, int flags)

4871

{

4872

FdHandle_t *fdP;

4873

int code;

4874

#ifdef AFS_DEMAND_ATTACH_FS1

4875

VolState state_save;

4876

#endif

4877

4878

if (flags & VOL_SYNC_WAIT0x1) {

4879

VUpdateVolume_r(ec, vp, VOL_UPDATE_WAIT0x1);

4880

} else {

4881

VUpdateVolume_r(ec, vp, 0);

4882

}

4883

if (!*ec) {

4884

#ifdef AFS_DEMAND_ATTACH_FS1

4885

state_save = VChangeState_r(vp, VOL_STATE_UPDATING);

4886

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4886), 0));

4887

#endif

4888

fdP = IH_OPEN(V_diskDataHandle(vp))ih_open(((vp)->diskDataHandle));

4889

osi_Assert(fdP != NULL)(void)((fdP != ((void *)0)) || (osi_AssertFailU("fdP != NULL"
, "./../vol/volume.c", 4889), 0));

4890

code = FDH_SYNC(fdP)((fdP->fd_ih!=((void *)0)) ? ( fdP->fd_ih->ih_synced
= 1) - 1 : 1);

4891

osi_Assert(code == 0)(void)((code == 0) || (osi_AssertFailU("code == 0", "./../vol/volume.c"
, 4891), 0));

4892

FDH_CLOSE(fdP)(fd_close(fdP), (fdP)=((void *)0), 0);

4893

#ifdef AFS_DEMAND_ATTACH_FS1

4894

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4894), 0));

4895

VChangeState_r(vp, state_save);

4896

#endif

4897

}

4898

}

4899

4900

void

4901

VSyncVolume(Errorbit32 * ec, Volume * vp)

4902

{

4903

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 4903), 0));

4904

VSyncVolume_r(ec, vp, VOL_SYNC_WAIT0x1);

4905

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 4905), 0));

4906

}

4907

4908

4909

/***************************************************/

4910

/* Volume dealloaction routines */

4911

/***************************************************/

4912

4913

#ifdef AFS_DEMAND_ATTACH_FS1

4914

static void

4915

FreeVolume(Volume * vp)

4916

{

4917

/* free the heap space, iff it's safe.

4918

* otherwise, pull it out of the hash table, so it

4919

* will get deallocated when all refs to it go away */

4920

if (!VCheckFree(vp)) {

4921

DeleteVolumeFromHashTable(vp);

4922

DeleteVolumeFromVByPList_r(vp);

4923

4924

/* make sure we invalidate the header cache entry */

4925

FreeVolumeHeader(vp);

4926

}

4927

}

4928

#endif /* AFS_DEMAND_ATTACH_FS */

4929

4930

static void

4931

ReallyFreeVolume(Volume * vp)

4932

{

4933

int i;

4934

if (!vp)

4935

return;

4936

#ifdef AFS_DEMAND_ATTACH_FS1

4937

/* debug */

4938

VChangeState_r(vp, VOL_STATE_FREED);

4939

if (vp->pending_vol_op)

4940

free(vp->pending_vol_op);

4941

#endif /* AFS_DEMAND_ATTACH_FS */

4942

for (i = 0; i < nVNODECLASSES(((1<<1)-1)+1); i++)

4943

if (vp->vnodeIndex[i].bitmap)

4944

free(vp->vnodeIndex[i].bitmap);

4945

FreeVolumeHeader(vp);

4946

#ifndef AFS_DEMAND_ATTACH_FS1

4947

DeleteVolumeFromHashTable(vp);

4948

#endif /* AFS_DEMAND_ATTACH_FS */

4949

free(vp);

4950

}

4951

4952

/* check to see if we should shutdown this volume

4953

* returns 1 if volume was freed, 0 otherwise */

4954

#ifdef AFS_DEMAND_ATTACH_FS1

4955

static int

4956

VCheckDetach(Volume * vp)

4957

{

4958

int ret = 0;

4959

Errorbit32 ec = 0;

4960

4961

if (vp->nUsers || vp->nWaiters)

4962

return ret;

4963

4964

if (vp->shuttingDown) {

4965

ret = 1;

4966

if ((programType != fileServer) &&

4967

(V_inUse(vp)((vp)->header->diskstuff.inUse) == programType) &&

4968

((V_checkoutMode(vp)((vp)->checkoutMode) == V_VOLUPD3) ||

4969

(V_checkoutMode(vp)((vp)->checkoutMode) == V_SECRETLY5) ||

4970

((V_checkoutMode(vp)((vp)->checkoutMode) == V_CLONE2) &&

4971

(VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0))))) {

4972

V_inUse(vp)((vp)->header->diskstuff.inUse) = 0;

4973

VUpdateVolume_r(&ec, vp, VOL_UPDATE_NOFORCEOFF0x2);

4974

if (ec) {

4975

Log("VCheckDetach: volume header update for volume %u "

4976

"failed with errno %d\n", vp->hashid, errno(* __error()));

4977

}

4978

}

4979

VReleaseVolumeHandles_r(vp);

4980

VCheckSalvage(vp);

4981

ReallyFreeVolume(vp);

4982

if (programType == fileServer) {

4983

4984

}

4985

}

4986

return ret;

4987

}

4988

#else /* AFS_DEMAND_ATTACH_FS */

4989

static int

4990

VCheckDetach(Volume * vp)

4991

{

4992

int ret = 0;

4993

Errorbit32 ec = 0;

4994

4995

if (vp->nUsers)

4996

return ret;

4997

4998

if (vp->shuttingDown) {

4999

ret = 1;

5000

if ((programType != fileServer) &&

5001

(V_inUse(vp)((vp)->header->diskstuff.inUse) == programType) &&

5002

((V_checkoutMode(vp)((vp)->checkoutMode) == V_VOLUPD3) ||

5003

(V_checkoutMode(vp)((vp)->checkoutMode) == V_SECRETLY5) ||

5004

((V_checkoutMode(vp)((vp)->checkoutMode) == V_CLONE2) &&

5005

(VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0))))) {

5006

V_inUse(vp)((vp)->header->diskstuff.inUse) = 0;

5007

VUpdateVolume_r(&ec, vp, VOL_UPDATE_NOFORCEOFF0x2);

5008

if (ec) {

5009

Log("VCheckDetach: volume header update for volume %u failed with errno %d\n",

5010

vp->hashid, errno(* __error()));

5011

}

5012

}

5013

VReleaseVolumeHandles_r(vp);

5014

ReallyFreeVolume(vp);

5015

if (programType == fileServer) {

5016

#if defined(AFS_PTHREAD_ENV1)

5017

5018

#else /* AFS_PTHREAD_ENV */

5019

LWP_NoYieldSignal(VPutVolume);

5020

#endif /* AFS_PTHREAD_ENV */

5021

}

5022

}

5023

return ret;

5024

}

5025

#endif /* AFS_DEMAND_ATTACH_FS */

5026

5027

/* check to see if we should offline this volume

5028

* return 1 if volume went offline, 0 otherwise */

5029

#ifdef AFS_DEMAND_ATTACH_FS1

5030

static int

5031

VCheckOffline(Volume * vp)

5032

{

5033

int ret = 0;

5034

5035

if (vp->goingOffline && !vp->nUsers) {

5036

Errorbit32 error;

5037

osi_Assert(programType == fileServer)(void)((programType == fileServer) || (osi_AssertFailU("programType == fileServer"
, "./../vol/volume.c", 5037), 0));

5038

osi_Assert((V_attachState(vp) != VOL_STATE_ATTACHED) &&(void)(((((vp)->attach_state) != VOL_STATE_ATTACHED) &&
(((vp)->attach_state) != VOL_STATE_FREED) && (((vp
)->attach_state) != VOL_STATE_PREATTACHED) && (((vp
)->attach_state) != VOL_STATE_UNATTACHED) && (((vp
)->attach_state) != VOL_STATE_DELETED)) || (osi_AssertFailU
("(V_attachState(vp) != VOL_STATE_ATTACHED) && (V_attachState(vp) != VOL_STATE_FREED) && (V_attachState(vp) != VOL_STATE_PREATTACHED) && (V_attachState(vp) != VOL_STATE_UNATTACHED) && (V_attachState(vp) != VOL_STATE_DELETED)"
, "./../vol/volume.c", 5042), 0))

5039

(V_attachState(vp) != VOL_STATE_FREED) &&(void)(((((vp)->attach_state) != VOL_STATE_ATTACHED) &&
(((vp)->attach_state) != VOL_STATE_FREED) && (((vp
)->attach_state) != VOL_STATE_PREATTACHED) && (((vp
)->attach_state) != VOL_STATE_UNATTACHED) && (((vp
)->attach_state) != VOL_STATE_DELETED)) || (osi_AssertFailU
("(V_attachState(vp) != VOL_STATE_ATTACHED) && (V_attachState(vp) != VOL_STATE_FREED) && (V_attachState(vp) != VOL_STATE_PREATTACHED) && (V_attachState(vp) != VOL_STATE_UNATTACHED) && (V_attachState(vp) != VOL_STATE_DELETED)"
, "./../vol/volume.c", 5042), 0))

5040

(V_attachState(vp) != VOL_STATE_PREATTACHED) &&(void)(((((vp)->attach_state) != VOL_STATE_ATTACHED) &&
(((vp)->attach_state) != VOL_STATE_FREED) && (((vp
)->attach_state) != VOL_STATE_PREATTACHED) && (((vp
)->attach_state) != VOL_STATE_UNATTACHED) && (((vp
)->attach_state) != VOL_STATE_DELETED)) || (osi_AssertFailU
("(V_attachState(vp) != VOL_STATE_ATTACHED) && (V_attachState(vp) != VOL_STATE_FREED) && (V_attachState(vp) != VOL_STATE_PREATTACHED) && (V_attachState(vp) != VOL_STATE_UNATTACHED) && (V_attachState(vp) != VOL_STATE_DELETED)"
, "./../vol/volume.c", 5042), 0))

5041

(V_attachState(vp) != VOL_STATE_UNATTACHED) &&(void)(((((vp)->attach_state) != VOL_STATE_ATTACHED) &&
(((vp)->attach_state) != VOL_STATE_FREED) && (((vp
)->attach_state) != VOL_STATE_PREATTACHED) && (((vp
)->attach_state) != VOL_STATE_UNATTACHED) && (((vp
)->attach_state) != VOL_STATE_DELETED)) || (osi_AssertFailU
("(V_attachState(vp) != VOL_STATE_ATTACHED) && (V_attachState(vp) != VOL_STATE_FREED) && (V_attachState(vp) != VOL_STATE_PREATTACHED) && (V_attachState(vp) != VOL_STATE_UNATTACHED) && (V_attachState(vp) != VOL_STATE_DELETED)"
, "./../vol/volume.c", 5042), 0))

5042

(V_attachState(vp) != VOL_STATE_DELETED))(void)(((((vp)->attach_state) != VOL_STATE_ATTACHED) &&
(((vp)->attach_state) != VOL_STATE_FREED) && (((vp
)->attach_state) != VOL_STATE_PREATTACHED) && (((vp
)->attach_state) != VOL_STATE_UNATTACHED) && (((vp
)->attach_state) != VOL_STATE_DELETED)) || (osi_AssertFailU
("(V_attachState(vp) != VOL_STATE_ATTACHED) && (V_attachState(vp) != VOL_STATE_FREED) && (V_attachState(vp) != VOL_STATE_PREATTACHED) && (V_attachState(vp) != VOL_STATE_UNATTACHED) && (V_attachState(vp) != VOL_STATE_DELETED)"
, "./../vol/volume.c", 5042), 0));

5043

5044

/* valid states:

5045

5046

* VOL_STATE_GOING_OFFLINE

5047

* VOL_STATE_SHUTTING_DOWN

5048

* VIsErrorState(V_attachState(vp))

5049

* VIsExclusiveState(V_attachState(vp))

5050

5051

5052

VCreateReservation_r(vp);

5053

VChangeState_r(vp, VOL_STATE_OFFLINING);

5054

5055

ret = 1;

5056

/* must clear the goingOffline flag before we drop the glock */

5057

vp->goingOffline = 0;

5058

V_inUse(vp)((vp)->header->diskstuff.inUse) = 0;

5059

5060

VLRU_Delete_r(vp);

5061

5062

/* perform async operations */

5063

VUpdateVolume_r(&error, vp, 0);

5064

VCloseVolumeHandles_r(vp);

5065

5066

if (LogLevel) {

5067

if (V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)[0]) {

5068

Log("VOffline: Volume %lu (%s) is now offline (%s)\n",

5069

afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)), V_name(vp)((vp)->header->diskstuff.name),

5070

V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage));

5071

} else {

5072

Log("VOffline: Volume %lu (%s) is now offline\n",

5073

afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)), V_name(vp)((vp)->header->diskstuff.name));

5074

}

5075

}

5076

5077

/* invalidate the volume header cache entry */

5078

FreeVolumeHeader(vp);

5079

5080

/* if nothing changed state to error or salvaging,

5081

* drop state to unattached */

5082

if (!VIsErrorState(V_attachState(vp)((vp)->attach_state))) {

5083

VChangeState_r(vp, VOL_STATE_UNATTACHED);

5084

}

5085

VCancelReservation_r(vp);

5086

/* no usage of vp is safe beyond this point */

5087

}

5088

return ret;

5089

}

5090

#else /* AFS_DEMAND_ATTACH_FS */

5091

static int

5092

VCheckOffline(Volume * vp)

5093

{

5094

int ret = 0;

5095

5096

if (vp->goingOffline && !vp->nUsers) {

5097

Errorbit32 error;

5098

osi_Assert(programType == fileServer)(void)((programType == fileServer) || (osi_AssertFailU("programType == fileServer"
, "./../vol/volume.c", 5098), 0));

5099

5100

ret = 1;

5101

vp->goingOffline = 0;

5102

V_inUse(vp)((vp)->header->diskstuff.inUse) = 0;

5103

VUpdateVolume_r(&error, vp, 0);

5104

VCloseVolumeHandles_r(vp);

5105

if (LogLevel) {

5106

if (V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage)[0]) {

5107

Log("VOffline: Volume %lu (%s) is now offline (%s)\n",

5108

afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)), V_name(vp)((vp)->header->diskstuff.name),

5109

V_offlineMessage(vp)((vp)->header->diskstuff.offlineMessage));

5110

} else {

5111

Log("VOffline: Volume %lu (%s) is now offline\n",

5112

afs_printable_uint32_lu(V_id(vp)((vp)->header->diskstuff.id)), V_name(vp)((vp)->header->diskstuff.name));

5113

}

5114

}

5115

FreeVolumeHeader(vp);

5116

#ifdef AFS_PTHREAD_ENV1

5117

5118

#else /* AFS_PTHREAD_ENV */

5119

LWP_NoYieldSignal(VPutVolume);

5120

#endif /* AFS_PTHREAD_ENV */

5121

}

5122

return ret;

5123

}

5124

#endif /* AFS_DEMAND_ATTACH_FS */

5125

5126

/***************************************************/

5127

/* demand attach fs ref counting routines */

5128

/***************************************************/

5129

5130

#ifdef AFS_DEMAND_ATTACH_FS1

5131

/* the following two functions handle reference counting for

5132

* asynchronous operations on volume structs.

5133

5134

* their purpose is to prevent a VDetachVolume or VShutdown

5135

* from free()ing the Volume struct during an async i/o op */

5136

5137

/* register with the async volume op ref counter */

5138

/* VCreateReservation_r moved into inline code header because it

5139

* is now needed in vnode.c -- tkeiser 11/20/2007

5140

5141

5142

/**

5143

* decrement volume-package internal refcount.

5144

5145

* @param vp volume object pointer

5146

5147

* @internal volume package internal use only

5148

5149

* @pre

5150

* @arg VOL_LOCK is held

5151

* @arg lightweight refcount held

5152

5153

* @post volume waiters refcount is decremented; volume may

5154

* have been deallocated/shutdown/offlined/salvaged/

5155

* whatever during the process

5156

5157

* @warning once you have tossed your last reference (you can acquire

5158

* lightweight refs recursively) it is NOT SAFE to reference

5159

* a volume object pointer ever again

5160

5161

* @see VCreateReservation_r

5162

5163

* @note DEMAND_ATTACH_FS only

5164

5165

void

5166

VCancelReservation_r(Volume * vp)

5167

{

5168

osi_Assert(--vp->nWaiters >= 0)(void)((--vp->nWaiters >= 0) || (osi_AssertFailU("--vp->nWaiters >= 0"
, "./../vol/volume.c", 5168), 0));

5169

if (vp->nWaiters == 0) {

5170

VCheckOffline(vp);

5171

if (!VCheckDetach(vp)) {

5172

VCheckSalvage(vp);

5173

VCheckFree(vp);

5174

}

5175

}

5176

}

5177

5178

/* check to see if we should free this volume now

5179

* return 1 if volume was freed, 0 otherwise */

5180

static int

5181

VCheckFree(Volume * vp)

5182

{

5183

int ret = 0;

5184

if ((vp->nUsers == 0) &&

5185

(vp->nWaiters == 0) &&

5186

!(V_attachFlags(vp)((vp)->attach_flags) & (VOL_IN_HASH |

5187

VOL_ON_VBYP_LIST |

5188

VOL_IS_BUSY |

5189

VOL_ON_VLRU))) {

5190

ReallyFreeVolume(vp);

5191

ret = 1;

5192

}

5193

return ret;

5194

}

5195

#endif /* AFS_DEMAND_ATTACH_FS */

5196

5197

5198

/***************************************************/

5199

/* online volume operations routines */

5200

/***************************************************/

5201

5202

#ifdef AFS_DEMAND_ATTACH_FS1

5203

/**

5204

* register a volume operation on a given volume.

5205

5206

* @param[in] vp volume object

5207

* @param[in] vopinfo volume operation info object

5208

5209

* @pre VOL_LOCK is held

5210

5211

* @post volume operation info object attached to volume object.

5212

* volume operation statistics updated.

5213

5214

* @note by "attached" we mean a copy of the passed in object is made

5215

5216

* @internal volume package internal use only

5217

5218

int

5219

VRegisterVolOp_r(Volume * vp, FSSYNC_VolOp_info * vopinfo)

5220

{

5221

FSSYNC_VolOp_info * info;

5222

5223

/* attach a vol op info node to the volume struct */

5224

info = (FSSYNC_VolOp_info *) malloc(sizeof(FSSYNC_VolOp_info));

5225

osi_Assert(info != NULL)(void)((info != ((void *)0)) || (osi_AssertFailU("info != NULL"
, "./../vol/volume.c", 5225), 0));

5226

memcpy(info, vopinfo, sizeof(FSSYNC_VolOp_info));

5227

vp->pending_vol_op = info;

5228

5229

/* update stats */

5230

vp->stats.last_vol_op = FT_ApproxTime();

5231

vp->stats.vol_ops++;

5232

IncUInt64(&VStats.vol_ops)(*(&VStats.vol_ops))++;

5233

5234

return 0;

5235

}

5236

5237

/**

5238

* deregister the volume operation attached to this volume.

5239

5240

* @param[in] vp volume object pointer

5241

5242

* @pre VOL_LOCK is held

5243

5244

* @post the volume operation info object is detached from the volume object

5245

5246

* @internal volume package internal use only

5247

5248

int

5249

VDeregisterVolOp_r(Volume * vp)

5250

{

5251

if (vp->pending_vol_op) {

5252

free(vp->pending_vol_op);

5253

vp->pending_vol_op = NULL((void *)0);

5254

}

5255

return 0;

5256

}

5257

#endif /* AFS_DEMAND_ATTACH_FS */

5258

5259

/**

5260

* determine whether it is safe to leave a volume online during

5261

* the volume operation described by the vopinfo object.

5262

5263

* @param[in] vp volume object

5264

* @param[in] vopinfo volume operation info object

5265

5266

* @return whether it is safe to leave volume online

5267

* @retval 0 it is NOT SAFE to leave the volume online

5268

* @retval 1 it is safe to leave the volume online during the operation

5269

5270

* @pre

5271

* @arg VOL_LOCK is held

5272

* @arg disk header attached to vp (heavyweight ref on vp will guarantee

5273

* this condition is met)

5274

5275

* @internal volume package internal use only

5276

5277

int

5278

VVolOpLeaveOnline_r(Volume * vp, FSSYNC_VolOp_info * vopinfo)

5279

{

5280

return (vopinfo->vol_op_state == FSSYNC_VolOpRunningOnline ||

5281

(vopinfo->com.command == FSYNC_VOL_NEEDVOLUME &&

5282

(vopinfo->com.reason == V_READONLY1 ||

5283

(!VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0) &&

5284

(vopinfo->com.reason == V_CLONE2 ||

5285

vopinfo->com.reason == V_DUMP4)))));

5286

}

5287

5288

/**

5289

* same as VVolOpLeaveOnline_r, but does not require a volume with an attached

5290

* header.

5291

5292

* @param[in] vp volume object

5293

* @param[in] vopinfo volume operation info object

5294

5295

* @return whether it is safe to leave volume online

5296

* @retval 0 it is NOT SAFE to leave the volume online

5297

* @retval 1 it is safe to leave the volume online during the operation

5298

* @retval -1 unsure; volume header is required in order to know whether or

5299

* not is is safe to leave the volume online

5300

5301

* @pre VOL_LOCK is held

5302

5303

* @internal volume package internal use only

5304

5305

int

5306

VVolOpLeaveOnlineNoHeader_r(Volume * vp, FSSYNC_VolOp_info * vopinfo)

5307

{

5308

/* follow the logic in VVolOpLeaveOnline_r; this is the same, except

5309

* assume that we don't know VolumeWriteable; return -1 if the answer

5310

* depends on VolumeWriteable */

5311

5312

if (vopinfo->vol_op_state == FSSYNC_VolOpRunningOnline) {

5313

return 1;

5314

}

5315

if (vopinfo->com.command == FSYNC_VOL_NEEDVOLUME &&

5316

vopinfo->com.reason == V_READONLY1) {

5317

5318

return 1;

5319

}

5320

if (vopinfo->com.command == FSYNC_VOL_NEEDVOLUME &&

5321

(vopinfo->com.reason == V_CLONE2 ||

5322

vopinfo->com.reason == V_DUMP4)) {

5323

5324

/* must know VolumeWriteable */

5325

return -1;

5326

}

5327

return 0;

5328

}

5329

5330

/**

5331

* determine whether VBUSY should be set during this volume operation.

5332

5333

* @param[in] vp volume object

5334

* @param[in] vopinfo volume operation info object

5335

5336

* @return whether VBUSY should be set

5337

* @retval 0 VBUSY does NOT need to be set

5338

* @retval 1 VBUSY SHOULD be set

5339

5340

* @pre VOL_LOCK is held

5341

5342

* @internal volume package internal use only

5343

5344

int

5345

VVolOpSetVBusy_r(Volume * vp, FSSYNC_VolOp_info * vopinfo)

5346

{

5347

return ((vopinfo->com.command == FSYNC_VOL_OFF &&

5348

vopinfo->com.reason == FSYNC_SALVAGE) ||

5349

(vopinfo->com.command == FSYNC_VOL_NEEDVOLUME &&

5350

(vopinfo->com.reason == V_CLONE2 ||

5351

vopinfo->com.reason == V_DUMP4)));

5352

}

5353

5354

5355

/***************************************************/

5356

/* online salvager routines */

5357

/***************************************************/

5358

#if defined(AFS_DEMAND_ATTACH_FS1)

5359

5360

/**

5361

* offline a volume to let it be salvaged.

5362

5363

* @param[in] vp Volume to offline

5364

5365

* @return whether we offlined the volume successfully

5366

* @retval 0 volume was not offlined

5367

* @retval 1 volume is now offline

5368

5369

* @note This is similar to VCheckOffline, but slightly different. We do not

5370

* deal with vp->goingOffline, and we try to avoid touching the volume

5371

* header except just to set needsSalvaged

5372

5373

* @pre VOL_LOCK held

5374

* @pre vp->nUsers == 0

5375

* @pre V_attachState(vp) == VOL_STATE_SALVAGE_REQ

5376

5377

static int

5378

VOfflineForSalvage_r(struct Volume *vp)

5379

{

5380

Errorbit32 error;

5381

5382

VCreateReservation_r(vp);

5383

VWaitExclusiveState_r(vp);

5384

5385

if (vp->nUsers || V_attachState(vp)((vp)->attach_state) == VOL_STATE_SALVAGING) {

5386

/* Someone's using the volume, or someone got to scheduling the salvage

5387

* before us. I don't think either of these should be possible, as we

5388

* should gain no new heavyweight references while we're trying to

5389

* salvage, but just to be sure... */

5390

VCancelReservation_r(vp);

5391

return 0;

5392

}

5393

5394

VChangeState_r(vp, VOL_STATE_OFFLINING);

5395

5396

VLRU_Delete_r(vp);

5397

if (vp->header) {

5398

V_needsSalvaged(vp)((vp)->header->diskstuff.needsSalvaged) = 1;

5399

/* ignore error; updating needsSalvaged is just best effort */

5400

VUpdateVolume_r(&error, vp, VOL_UPDATE_NOFORCEOFF0x2);

5401

}

5402

VCloseVolumeHandles_r(vp);

5403

5404

FreeVolumeHeader(vp);

5405

5406

/* volume has been effectively offlined; we can mark it in the SALVAGING

5407

* state now, which lets FSSYNC give it away */

5408

VChangeState_r(vp, VOL_STATE_SALVAGING);

5409

5410

VCancelReservation_r(vp);

5411

5412

return 1;

5413

}

5414

5415

/**

5416

* check whether a salvage needs to be performed on this volume.

5417

5418

* @param[in] vp pointer to volume object

5419

5420

* @return status code

5421

* @retval 0 no salvage scheduled

5422

* @retval 1 a salvage has been scheduled with the salvageserver

5423

5424

* @pre VOL_LOCK is held

5425

5426

* @post if salvage request flag is set and nUsers and nWaiters are zero,

5427

* then a salvage will be requested

5428

5429

* @note this is one of the event handlers called by VCancelReservation_r

5430

5431

* @note the caller must check if the volume needs to be freed after calling

5432

* this; the volume may not have any references or be on any lists after

5433

* we return, and we do not free it

5434

5435

* @see VCancelReservation_r

5436

5437

* @internal volume package internal use only.

5438

5439

static int

5440

VCheckSalvage(Volume * vp)

5441

{

5442

int ret = 0;

5443

#if defined(SALVSYNC_BUILD_CLIENT1) || defined(FSSYNC_BUILD_CLIENT)

5444

if (vp->nUsers)

5445

return ret;

5446

if (!vp->salvage.requested) {

5447

return ret;

5448

}

5449

5450

/* prevent recursion; some of the code below creates and removes

5451

* lightweight refs, which can call VCheckSalvage */

5452

if (vp->salvage.scheduling) {

5453

return ret;

5454

}

5455

vp->salvage.scheduling = 1;

5456

5457

if (V_attachState(vp)((vp)->attach_state) == VOL_STATE_SALVAGE_REQ) {

5458

if (!VOfflineForSalvage_r(vp)) {

5459

vp->salvage.scheduling = 0;

5460

return ret;

5461

}

5462

}

5463

5464

if (vp->salvage.requested) {

5465

VScheduleSalvage_r(vp);

5466

ret = 1;

5467

}

5468

vp->salvage.scheduling = 0;

5469

#endif /* SALVSYNC_BUILD_CLIENT || FSSYNC_BUILD_CLIENT */

5470

return ret;

5471

}

5472

5473

/**

5474

* request volume salvage.

5475

5476

* @param[out] ec computed client error code

5477

* @param[in] vp volume object pointer

5478

* @param[in] reason reason code (passed to salvageserver via SALVSYNC)

5479

* @param[in] flags see flags note below

5480

5481

* @note flags:

5482

* VOL_SALVAGE_INVALIDATE_HEADER causes volume header cache entry

5483

* to be invalidated.

5484

5485

* @pre VOL_LOCK is held.

5486

5487

* @post volume state is changed.

5488

* for fileserver, salvage will be requested once refcount reaches zero.

5489

5490

* @return operation status code

5491

* @retval 0 volume salvage will occur

5492

* @retval 1 volume salvage could not be scheduled

5493

5494

* @note DAFS only

5495

5496

* @note in the fileserver, this call does not synchronously schedule a volume

5497

* salvage. rather, it sets volume state so that when volume refcounts

5498

* reach zero, a volume salvage will occur. by "refcounts", we mean both

5499

* nUsers and nWaiters must be zero.

5500

5501

* @internal volume package internal use only.

5502

5503

int

5504

VRequestSalvage_r(Errorbit32 * ec, Volume * vp, int reason, int flags)

5505

{

5506

int code = 0;

5507

5508

* for DAFS volume utilities that are not supposed to schedule salvages,

5509

* just transition to error state instead

5510

5511

if (!VCanScheduleSalvage()) {

5512

VChangeState_r(vp, VOL_STATE_ERROR);

5513

*ec = VSALVAGE101;

5514

return 1;

5515

}

5516

5517

if (programType != fileServer && !VCanUseFSSYNC()) {

5518

VChangeState_r(vp, VOL_STATE_ERROR);

5519

*ec = VSALVAGE101;

5520

return 1;

5521

}

5522

5523

if (!vp->salvage.requested) {

5524

vp->salvage.requested = 1;

5525

vp->salvage.reason = reason;

5526

vp->stats.last_salvage = FT_ApproxTime();

5527

5528

/* Note that it is not possible for us to reach this point if a

5529

* salvage is already running on this volume (even if the fileserver

5530

* was restarted during the salvage). If a salvage were running, the

5531

* salvager would have write-locked the volume header file, so when

5532

* we tried to lock the volume header, the lock would have failed,

5533

* and we would have failed during attachment prior to calling

5534

* VRequestSalvage. So we know that we can schedule salvages without

5535

* fear of a salvage already running for this volume. */

5536

5537

if (vp->stats.salvages < SALVAGE_COUNT_MAX16) {

5538

5539

/* if we don't need to offline the volume, we can go directly

5540

* to SALVAGING. SALVAGING says the volume is offline and is

5541

* either salvaging or ready to be handed to the salvager.

5542

* SALVAGE_REQ says that we want to salvage the volume, but we

5543

* are waiting for it to go offline first. */

5544

if (flags & VOL_SALVAGE_NO_OFFLINE0x2) {

5545

VChangeState_r(vp, VOL_STATE_SALVAGING);

5546

} else {

5547

VChangeState_r(vp, VOL_STATE_SALVAGE_REQ);

5548

if (vp->nUsers == 0) {

5549

/* normally VOfflineForSalvage_r would be called from

5550

* PutVolume et al when nUsers reaches 0, but if

5551

* it's already 0, just do it ourselves, since PutVolume

5552

* isn't going to get called */

5553

VOfflineForSalvage_r(vp);

5554

}

5555

}

5556

/* If we are non-fileserver, we're telling the fileserver to

5557

* salvage the vol, so we don't need to give it back separately. */

5558

vp->needsPutBack = 0;

5559

5560

*ec = VSALVAGING113;

5561

} else {

5562

Log("VRequestSalvage: volume %u online salvaged too many times; forced offline.\n", vp->hashid);

5563

5564

/* make sure neither VScheduleSalvage_r nor

5565

* VUpdateSalvagePriority_r try to schedule another salvage */

5566

vp->salvage.requested = vp->salvage.scheduled = 0;

5567

5568

VChangeState_r(vp, VOL_STATE_ERROR);

5569

*ec = VSALVAGE101;

5570

code = 1;

5571

}

5572

if (flags & VOL_SALVAGE_INVALIDATE_HEADER0x1) {

5573

/* Instead of ReleaseVolumeHeader, we do FreeVolumeHeader()

5574

so that the the next VAttachVolumeByVp_r() invocation

5575

of attach2() will pull in a cached header

5576

entry and fail, then load a fresh one from disk and attach

5577

it to the volume.

5578

5579

FreeVolumeHeader(vp);

5580

}

5581

}

5582

return code;

5583

}

5584

5585

/**

5586

* update salvageserver scheduling priority for a volume.

5587

5588

* @param[in] vp pointer to volume object

5589

5590

* @return operation status

5591

* @retval 0 success

5592

* @retval 1 request denied, or SALVSYNC communications failure

5593

5594

* @pre VOL_LOCK is held.

5595

5596

* @post in-core salvage priority counter is incremented. if at least

5597

* SALVAGE_PRIO_UPDATE_INTERVAL seconds have elapsed since the

5598

* last SALVSYNC_RAISEPRIO request, we contact the salvageserver

5599

* to update its priority queue. if no salvage is scheduled,

5600

* this function is a no-op.

5601

5602

* @note DAFS fileserver only

5603

5604

* @note this should be called whenever a VGetVolume fails due to a

5605

* pending salvage request

5606

5607

* @todo should set exclusive state and drop glock around salvsync call

5608

5609

* @internal volume package internal use only.

5610

5611

int

5612

VUpdateSalvagePriority_r(Volume * vp)

5613

{

5614

int ret=0;

5615

5616

#ifdef SALVSYNC_BUILD_CLIENT1

5617

afs_uint32 now;

5618

int code;

5619

5620

vp->salvage.prio++;

5621

now = FT_ApproxTime();

5622

5623

/* update the salvageserver priority queue occasionally so that

5624

* frequently requested volumes get moved to the head of the queue

5625

5626

if ((vp->salvage.scheduled) &&

5627

(vp->stats.last_salvage_req < (now-SALVAGE_PRIO_UPDATE_INTERVAL3))) {

5628

code = SALVSYNC_SalvageVolume(vp->hashid,

5629

VPartitionPath(vp->partition),

5630

SALVSYNC_RAISEPRIOSALVSYNC_OP_RAISEPRIO,

5631

vp->salvage.reason,

5632

vp->salvage.prio,

5633

NULL((void *)0));

5634

vp->stats.last_salvage_req = now;

5635

if (code != SYNC_OK) {

5636

ret = 1;

5637

}

5638

}

5639

#endif /* SALVSYNC_BUILD_CLIENT */

5640

return ret;

5641

}

5642

5643

5644

#if defined(SALVSYNC_BUILD_CLIENT1) || defined(FSSYNC_BUILD_CLIENT)

5645

5646

/* A couple of little helper functions. These return true if we tried to

5647

* use this mechanism to schedule a salvage, false if we haven't tried.

5648

* If we did try a salvage then the results are contained in code.

5649

5650

5651

static_inlinestatic inline int

5652

try_SALVSYNC(Volume *vp, char *partName, int *code) {

5653

#ifdef SALVSYNC_BUILD_CLIENT1

5654

if (VCanUseSALVSYNC()) {

5655

Log("Scheduling salvage for volume %lu on part %s over SALVSYNC\n",

5656

afs_printable_uint32_lu(vp->hashid), partName);

5657

5658

/* can't use V_id() since there's no guarantee

5659

* we have the disk data header at this point */

5660

*code = SALVSYNC_SalvageVolume(vp->hashid,

5661

partName,

5662

SALVSYNC_SALVAGESALVSYNC_OP_SALVAGE,

5663

vp->salvage.reason,

5664

vp->salvage.prio,

5665

NULL((void *)0));

5666

return 1;

5667

}

5668

#endif

5669

return 0;

5670

}

5671

5672

static_inlinestatic inline int

5673

try_FSSYNC(Volume *vp, char *partName, int *code) {

5674

#ifdef FSSYNC_BUILD_CLIENT

5675

if (VCanUseFSSYNC()) {

5676

Log("Scheduling salvage for volume %lu on part %s over FSSYNC\n",

5677

afs_printable_uint32_lu(vp->hashid), partName);

5678

5679

5680

* If we aren't the fileserver, tell the fileserver the volume

5681

* needs to be salvaged. We could directly tell the

5682

* salvageserver, but the fileserver keeps track of some stats

5683

* related to salvages, and handles some other salvage-related

5684

* complications for us.

5685

5686

*code = FSYNC_VolOp(vp->hashid, partName,

5687

FSYNC_VOL_FORCE_ERROR, FSYNC_SALVAGE, NULL((void *)0));

5688

return 1;

5689

}

5690

#endif /* FSSYNC_BUILD_CLIENT */

5691

return 0;

5692

}

5693

5694

/**

5695

* schedule a salvage with the salvage server or fileserver.

5696

5697

* @param[in] vp pointer to volume object

5698

5699

* @return operation status

5700

* @retval 0 salvage scheduled successfully

5701

* @retval 1 salvage not scheduled, or SALVSYNC/FSSYNC com error

5702

5703

* @pre

5704

* @arg VOL_LOCK is held.

5705

* @arg nUsers and nWaiters should be zero.

5706

5707

* @post salvageserver or fileserver is sent a salvage request

5708

5709

* @note If we are the fileserver, the request will be sent to the salvage

5710

* server over SALVSYNC. If we are not the fileserver, the request will be

5711

* sent to the fileserver over FSSYNC (FSYNC_VOL_FORCE_ERROR/FSYNC_SALVAGE).

5712

5713

* @note the caller must check if the volume needs to be freed after calling

5714

* this; the volume may not have any references or be on any lists after

5715

* we return, and we do not free it

5716

5717

* @note DAFS only

5718

5719

* @internal volume package internal use only.

5720

5721

static int

5722

VScheduleSalvage_r(Volume * vp)

5723

{

5724

int ret=0;

5725

int code = 0;

5726

VolState state_save;

5727

VThreadOptions_t * thread_opts;

5728

char partName[16];

5729

5730

osi_Assert(VCanUseSALVSYNC() || VCanUseFSSYNC())(void)((VCanUseSALVSYNC() || VCanUseFSSYNC()) || (osi_AssertFailU
("VCanUseSALVSYNC() || VCanUseFSSYNC()", "./../vol/volume.c",
5730), 0));

5731

5732

if (vp->nWaiters || vp->nUsers) {

5733

return 1;

5734

}

5735

5736

/* prevent endless salvage,attach,salvage,attach,... loops */

5737

if (vp->stats.salvages >= SALVAGE_COUNT_MAX16)

5738

return 1;

5739

5740

5741

* don't perform salvsync ops on certain threads

5742

5743

thread_opts = pthread_getspecific(VThread_key);

5744

if (thread_opts == NULL((void *)0)) {

5745

thread_opts = &VThread_defaults;

5746

}

5747

if (thread_opts->disallow_salvsync || vol_disallow_salvsync) {

5748

return 1;

5749

}

5750

5751

if (vp->salvage.scheduled) {

5752

return ret;

5753

}

5754

5755

VCreateReservation_r(vp);

5756

VWaitExclusiveState_r(vp);

5757

5758

5759

* XXX the scheduling process should really be done asynchronously

5760

* to avoid fssync deadlocks

5761

5762

if (!vp->salvage.scheduled) {

5763

/* if we haven't previously scheduled a salvage, do so now

5764

5765

* set the volume to an exclusive state and drop the lock

5766

* around the SALVSYNC call

5767

5768

strlcpy(partName, VPartitionPath(vp->partition), sizeof(partName));

5769

state_save = VChangeState_r(vp, VOL_STATE_SALVSYNC_REQ);

5770

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 5770), 0));

5771

5772

osi_Assert(try_SALVSYNC(vp, partName, &code) ||(void)((try_SALVSYNC(vp, partName, &code) || try_FSSYNC(vp
, partName, &code)) || (osi_AssertFailU("try_SALVSYNC(vp, partName, &code) || try_FSSYNC(vp, partName, &code)"
, "./../vol/volume.c", 5773), 0))

5773

try_FSSYNC(vp, partName, &code))(void)((try_SALVSYNC(vp, partName, &code) || try_FSSYNC(vp
, partName, &code)) || (osi_AssertFailU("try_SALVSYNC(vp, partName, &code) || try_FSSYNC(vp, partName, &code)"
, "./../vol/volume.c", 5773), 0));

5774

5775

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 5775), 0));

5776

VChangeState_r(vp, state_save);

5777

5778

if (code == SYNC_OK) {

5779

vp->salvage.scheduled = 1;

5780

vp->stats.last_salvage_req = FT_ApproxTime();

5781

if (VCanUseSALVSYNC()) {

5782

/* don't record these stats for non-fileservers; let the

5783

* fileserver take care of these */

5784

vp->stats.salvages++;

5785

IncUInt64(&VStats.salvages)(*(&VStats.salvages))++;

5786

}

5787

} else {

5788

ret = 1;

5789

switch(code) {

5790

case SYNC_BAD_COMMAND:

5791

case SYNC_COM_ERROR:

5792

break;

5793

case SYNC_DENIED:

5794

Log("VScheduleSalvage_r: Salvage request for volume %lu "

5795

"denied\n", afs_printable_uint32_lu(vp->hashid));

5796

break;

5797

default:

5798

Log("VScheduleSalvage_r: Salvage request for volume %lu "

5799

"received unknown protocol error %d\n",

5800

afs_printable_uint32_lu(vp->hashid), code);

5801

break;

5802

}

5803

5804

if (VCanUseFSSYNC()) {

5805

VChangeState_r(vp, VOL_STATE_ERROR);

5806

}

5807

}

5808

}

5809

5810

/* NB: this is cancelling the reservation we obtained above, but we do

5811

* not call VCancelReservation_r, since that may trigger the vp dtor,

5812

* possibly free'ing the vp. We need to keep the vp around after

5813

* this, as the caller may reference vp without any refs. Instead, it

5814

* is the duty of the caller to inspect 'vp' after we return to see if

5815

* needs to be freed. */

5816

osi_Assert(--vp->nWaiters >= 0)(void)((--vp->nWaiters >= 0) || (osi_AssertFailU("--vp->nWaiters >= 0"
, "./../vol/volume.c", 5816), 0));

5817

return ret;

5818

}

5819

#endif /* SALVSYNC_BUILD_CLIENT || FSSYNC_BUILD_CLIENT */

5820

5821

#ifdef SALVSYNC_BUILD_CLIENT1

5822

5823

/**

5824

* connect to the salvageserver SYNC service.

5825

5826

* @return operation status

5827

* @retval 0 failure

5828

* @retval 1 success

5829

5830

* @post connection to salvageserver SYNC service established

5831

5832

* @see VConnectSALV_r

5833

* @see VDisconnectSALV

5834

* @see VReconnectSALV

5835

5836

int

5837

VConnectSALV(void)

5838

{

5839

int retVal;

5840

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 5840), 0));

5841

retVal = VConnectSALV_r();

5842

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 5842), 0));

5843

return retVal;

5844

}

5845

5846

/**

5847

* connect to the salvageserver SYNC service.

5848

5849

* @return operation status

5850

* @retval 0 failure

5851

* @retval 1 success

5852

5853

* @pre VOL_LOCK is held.

5854

5855

* @post connection to salvageserver SYNC service established

5856

5857

* @see VConnectSALV

5858

* @see VDisconnectSALV_r

5859

* @see VReconnectSALV_r

5860

* @see SALVSYNC_clientInit

5861

5862

* @internal volume package internal use only.

5863

5864

int

5865

VConnectSALV_r(void)

5866

{

5867

return SALVSYNC_clientInit();

5868

}

5869

5870

/**

5871

* disconnect from the salvageserver SYNC service.

5872

5873

* @return operation status

5874

* @retval 0 success

5875

5876

* @pre client should have a live connection to the salvageserver

5877

5878

* @post connection to salvageserver SYNC service destroyed

5879

5880

* @see VDisconnectSALV_r

5881

* @see VConnectSALV

5882

* @see VReconnectSALV

5883

5884

int

5885

VDisconnectSALV(void)

5886

{

5887

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 5887), 0));

5888

VDisconnectSALV_r();

5889

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 5889), 0));

5890

return 0;

5891

}

5892

5893

/**

5894

* disconnect from the salvageserver SYNC service.

5895

5896

* @return operation status

5897

* @retval 0 success

5898

5899

* @pre

5900

* @arg VOL_LOCK is held.

5901

* @arg client should have a live connection to the salvageserver.

5902

5903

* @post connection to salvageserver SYNC service destroyed

5904

5905

* @see VDisconnectSALV

5906

* @see VConnectSALV_r

5907

* @see VReconnectSALV_r

5908

* @see SALVSYNC_clientFinis

5909

5910

* @internal volume package internal use only.

5911

5912

int

5913

VDisconnectSALV_r(void)

5914

{

5915

return SALVSYNC_clientFinis();

5916

}

5917

5918

/**

5919

* disconnect and then re-connect to the salvageserver SYNC service.

5920

5921

* @return operation status

5922

* @retval 0 failure

5923

* @retval 1 success

5924

5925

* @pre client should have a live connection to the salvageserver

5926

5927

* @post old connection is dropped, and a new one is established

5928

5929

* @see VConnectSALV

5930

* @see VDisconnectSALV

5931

* @see VReconnectSALV_r

5932

5933

int

5934

VReconnectSALV(void)

5935

{

5936

int retVal;

5937

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 5937), 0));

5938

retVal = VReconnectSALV_r();

5939

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 5939), 0));

5940

return retVal;

5941

}

5942

5943

/**

5944

* disconnect and then re-connect to the salvageserver SYNC service.

5945

5946

* @return operation status

5947

* @retval 0 failure

5948

* @retval 1 success

5949

5950

* @pre

5951

* @arg VOL_LOCK is held.

5952

* @arg client should have a live connection to the salvageserver.

5953

5954

* @post old connection is dropped, and a new one is established

5955

5956

* @see VConnectSALV_r

5957

* @see VDisconnectSALV

5958

* @see VReconnectSALV

5959

* @see SALVSYNC_clientReconnect

5960

5961

* @internal volume package internal use only.

5962

5963

int

5964

VReconnectSALV_r(void)

5965

{

5966

return SALVSYNC_clientReconnect();

5967

}

5968

#endif /* SALVSYNC_BUILD_CLIENT */

5969

#endif /* AFS_DEMAND_ATTACH_FS */

5970

5971

5972

/***************************************************/

5973

/* FSSYNC routines */

5974

/***************************************************/

5975

5976

/* This must be called by any volume utility which needs to run while the

5977

file server is also running. This is separated from VInitVolumePackage2 so

5978

that a utility can fork--and each of the children can independently

5979

initialize communication with the file server */

5980

#ifdef FSSYNC_BUILD_CLIENT

5981

/**

5982

* connect to the fileserver SYNC service.

5983

5984

* @return operation status

5985

* @retval 0 failure

5986

* @retval 1 success

5987

5988

* @pre

5989

* @arg VInit must equal 2.

5990

* @arg Program Type must not be fileserver or salvager.

5991

5992

* @post connection to fileserver SYNC service established

5993

5994

* @see VConnectFS_r

5995

* @see VDisconnectFS

5996

* @see VChildProcReconnectFS

5997

5998

int

5999

VConnectFS(void)

6000

{

6001

int retVal;

6002

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6002), 0));

6003

retVal = VConnectFS_r();

6004

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6004), 0));

6005

return retVal;

6006

}

6007

6008

/**

6009

* connect to the fileserver SYNC service.

6010

6011

* @return operation status

6012

* @retval 0 failure

6013

* @retval 1 success

6014

6015

* @pre

6016

* @arg VInit must equal 2.

6017

* @arg Program Type must not be fileserver or salvager.

6018

* @arg VOL_LOCK is held.

6019

6020

* @post connection to fileserver SYNC service established

6021

6022

* @see VConnectFS

6023

* @see VDisconnectFS_r

6024

* @see VChildProcReconnectFS_r

6025

6026

* @internal volume package internal use only.

6027

6028

int

6029

VConnectFS_r(void)

6030

{

6031

int rc;

6032

osi_Assert((VInit == 2) &&(void)(((VInit == 2) && (programType != fileServer) &&
(programType != salvager)) || (osi_AssertFailU("(VInit == 2) && (programType != fileServer) && (programType != salvager)"
, "./../vol/volume.c", 6034), 0))

6033

(programType != fileServer) &&(void)(((VInit == 2) && (programType != fileServer) &&
(programType != salvager)) || (osi_AssertFailU("(VInit == 2) && (programType != fileServer) && (programType != salvager)"
, "./../vol/volume.c", 6034), 0))

6034

(programType != salvager))(void)(((VInit == 2) && (programType != fileServer) &&
(programType != salvager)) || (osi_AssertFailU("(VInit == 2) && (programType != fileServer) && (programType != salvager)"
, "./../vol/volume.c", 6034), 0));

6035

rc = FSYNC_clientInit();

6036

if (rc) {

6037

VSetVInit_r(3);

6038

}

6039

return rc;

6040

}

6041

6042

/**

6043

* disconnect from the fileserver SYNC service.

6044

6045

* @pre

6046

* @arg client should have a live connection to the fileserver.

6047

* @arg VOL_LOCK is held.

6048

* @arg Program Type must not be fileserver or salvager.

6049

6050

* @post connection to fileserver SYNC service destroyed

6051

6052

* @see VDisconnectFS

6053

* @see VConnectFS_r

6054

* @see VChildProcReconnectFS_r

6055

6056

* @internal volume package internal use only.

6057

6058

void

6059

VDisconnectFS_r(void)

6060

{

6061

osi_Assert((programType != fileServer) &&(void)(((programType != fileServer) && (programType !=
salvager)) || (osi_AssertFailU("(programType != fileServer) && (programType != salvager)"
, "./../vol/volume.c", 6062), 0))

6062

(programType != salvager))(void)(((programType != fileServer) && (programType !=
salvager)) || (osi_AssertFailU("(programType != fileServer) && (programType != salvager)"
, "./../vol/volume.c", 6062), 0));

6063

FSYNC_clientFinis();

6064

VSetVInit_r(2);

6065

}

6066

6067

/**

6068

* disconnect from the fileserver SYNC service.

6069

6070

* @pre

6071

* @arg client should have a live connection to the fileserver.

6072

* @arg Program Type must not be fileserver or salvager.

6073

6074

* @post connection to fileserver SYNC service destroyed

6075

6076

* @see VDisconnectFS_r

6077

* @see VConnectFS

6078

* @see VChildProcReconnectFS

6079

6080

void

6081

VDisconnectFS(void)

6082

{

6083

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6083), 0));

6084

VDisconnectFS_r();

6085

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6085), 0));

6086

}

6087

6088

/**

6089

* connect to the fileserver SYNC service from a child process following a fork.

6090

6091

* @return operation status

6092

* @retval 0 failure

6093

* @retval 1 success

6094

6095

* @pre

6096

* @arg VOL_LOCK is held.

6097

* @arg current FSYNC handle is shared with a parent process

6098

6099

* @post current FSYNC handle is discarded and a new connection to the

6100

* fileserver SYNC service is established

6101

6102

* @see VChildProcReconnectFS

6103

* @see VConnectFS_r

6104

* @see VDisconnectFS_r

6105

6106

* @internal volume package internal use only.

6107

6108

int

6109

VChildProcReconnectFS_r(void)

6110

{

6111

return FSYNC_clientChildProcReconnect();

6112

}

6113

6114

/**

6115

* connect to the fileserver SYNC service from a child process following a fork.

6116

6117

* @return operation status

6118

* @retval 0 failure

6119

* @retval 1 success

6120

6121

* @pre current FSYNC handle is shared with a parent process

6122

6123

* @post current FSYNC handle is discarded and a new connection to the

6124

* fileserver SYNC service is established

6125

6126

* @see VChildProcReconnectFS_r

6127

* @see VConnectFS

6128

* @see VDisconnectFS

6129

6130

int

6131

VChildProcReconnectFS(void)

6132

{

6133

int ret;

6134

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6134), 0));

6135

ret = VChildProcReconnectFS_r();

6136

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6136), 0));

6137

return ret;

6138

}

6139

#endif /* FSSYNC_BUILD_CLIENT */

6140

6141

6142

/***************************************************/

6143

/* volume bitmap routines */

6144

/***************************************************/

6145

6146

/**

6147

* allocate a vnode bitmap number for the vnode

6148

6149

* @param[out] ec error code

6150

* @param[in] vp volume object pointer

6151

* @param[in] index vnode index number for the vnode

6152

* @param[in] flags flag values described in note

6153

6154

* @note for DAFS, flags parameter controls locking behavior.

6155

* If (flags & VOL_ALLOC_BITMAP_WAIT) is set, then this function

6156

* will create a reservation and block on any other exclusive

6157

* operations. Otherwise, this function assumes the caller

6158

* already has exclusive access to vp, and we just change the

6159

* volume state.

6160

6161

* @pre VOL_LOCK held

6162

6163

* @return bit number allocated

6164

6165

6166

6167

6168

int

6169

VAllocBitmapEntry_r(Errorbit32 * ec, Volume * vp,

6170

struct vnodeIndex *index, int flags)

6171

{

6172

int ret = 0;

6173

byte *bp, *ep;

6174

#ifdef AFS_DEMAND_ATTACH_FS1

6175

VolState state_save;

6176

#endif /* AFS_DEMAND_ATTACH_FS */

6177

6178

*ec = 0;

6179

6180

/* This test is probably redundant */

6181

if (!VolumeWriteable(vp)(((vp)->header->diskstuff.type)==0)) {

6182

*ec = (bit32) VREADONLY30;

6183

return ret;

6184

}

6185

6186

#ifdef AFS_DEMAND_ATTACH_FS1

6187

if (flags & VOL_ALLOC_BITMAP_WAIT0x1) {

6188

VCreateReservation_r(vp);

6189

VWaitExclusiveState_r(vp);

6190

}

6191

state_save = VChangeState_r(vp, VOL_STATE_GET_BITMAP);

6192

#endif /* AFS_DEMAND_ATTACH_FS */

6193

6194

#ifdef BITMAP_LATER

6195

if ((programType == fileServer) && !index->bitmap) {

6196

int i;

6197

#ifndef AFS_DEMAND_ATTACH_FS1

6198

/* demand attach fs uses the volume state to avoid races.

6199

* specialStatus field is not used at all */

6200

int wasVBUSY = 0;

6201

if (vp->specialStatus == VBUSY110) {

6202

if (vp->goingOffline) { /* vos dump waiting for the volume to

6203

* go offline. We probably come here

6204

* from AddNewReadableResidency */

6205

wasVBUSY = 1;

6206

} else {

6207

while (vp->specialStatus == VBUSY110) {

6208

#ifdef AFS_PTHREAD_ENV1

6209

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6209), 0));

6210

sleep(2);

6211

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6211), 0));

6212

#else /* !AFS_PTHREAD_ENV */

6213

IOMGR_Sleep(2);

6214

#endif /* !AFS_PTHREAD_ENV */

6215

}

6216

}

6217

}

6218

#endif /* !AFS_DEMAND_ATTACH_FS */

6219

6220

if (!index->bitmap) {

6221

#ifndef AFS_DEMAND_ATTACH_FS1

6222

vp->specialStatus = VBUSY110; /* Stop anyone else from using it. */

6223

#endif /* AFS_DEMAND_ATTACH_FS */

6224

for (i = 0; i < nVNODECLASSES(((1<<1)-1)+1); i++) {

6225

VGetBitmap_r(ec, vp, i);

6226

if (*ec) {

6227

#ifdef AFS_DEMAND_ATTACH_FS1

6228

VRequestSalvage_r(ec, vp, SALVSYNC_ERRORSALVSYNC_REASON_ERROR, VOL_SALVAGE_INVALIDATE_HEADER0x1);

6229

#else /* AFS_DEMAND_ATTACH_FS */

6230

DeleteVolumeFromHashTable(vp);

6231

vp->shuttingDown = 1; /* Let who has it free it. */

6232

vp->specialStatus = 0;

6233

#endif /* AFS_DEMAND_ATTACH_FS */

6234

goto done;

6235

}

6236

}

6237

#ifndef AFS_DEMAND_ATTACH_FS1

6238

if (!wasVBUSY)

6239

vp->specialStatus = 0; /* Allow others to have access. */

6240

#endif /* AFS_DEMAND_ATTACH_FS */

6241

}

6242

}

6243

#endif /* BITMAP_LATER */

6244

6245

#ifdef AFS_DEMAND_ATTACH_FS1

6246

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6246), 0));

6247

#endif /* AFS_DEMAND_ATTACH_FS */

6248

bp = index->bitmap + index->bitmapOffset;

6249

ep = index->bitmap + index->bitmapSize;

6250

while (bp < ep) {

6251

if ((*(bit32 *) bp) != (bit32) 0xffffffff) {

6252

int o;

6253

index->bitmapOffset = (afs_uint32) (bp - index->bitmap);

6254

while (*bp == 0xff)

6255

bp++;

6256

o = ffs(~*bp) - 1; /* ffs is documented in BSTRING(3) */

6257

*bp |= (1 << o);

6258

ret = ((bp - index->bitmap) * 8 + o);

6259

#ifdef AFS_DEMAND_ATTACH_FS1

6260

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6260), 0));

6261

#endif /* AFS_DEMAND_ATTACH_FS */

6262

goto done;

6263

}

6264

bp += sizeof(bit32) /* i.e. 4 */ ;

6265

}

6266

/* No bit map entry--must grow bitmap */

6267

bp = (byte *)

6268

realloc(index->bitmap, index->bitmapSize + VOLUME_BITMAP_GROWSIZE16);

6269

osi_Assert(bp != NULL)(void)((bp != ((void *)0)) || (osi_AssertFailU("bp != NULL", "./../vol/volume.c"
, 6269), 0));

6270

index->bitmap = bp;

6271

bp += index->bitmapSize;

6272

memset(bp, 0, VOLUME_BITMAP_GROWSIZE16);

6273

index->bitmapOffset = index->bitmapSize;

6274

index->bitmapSize += VOLUME_BITMAP_GROWSIZE16;

6275

*bp = 1;

6276

ret = index->bitmapOffset * 8;

6277

#ifdef AFS_DEMAND_ATTACH_FS1

6278

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6278), 0));

6279

#endif /* AFS_DEMAND_ATTACH_FS */

6280

6281

done:

6282

#ifdef AFS_DEMAND_ATTACH_FS1

6283

VChangeState_r(vp, state_save);

6284

if (flags & VOL_ALLOC_BITMAP_WAIT0x1) {

6285

VCancelReservation_r(vp);

6286

}

6287

#endif /* AFS_DEMAND_ATTACH_FS */

6288

return ret;

6289

}

6290

6291

int

6292

VAllocBitmapEntry(Errorbit32 * ec, Volume * vp, struct vnodeIndex * index)

6293

{

6294

int retVal;

6295

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6295), 0));

6296

retVal = VAllocBitmapEntry_r(ec, vp, index, VOL_ALLOC_BITMAP_WAIT0x1);

6297

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6297), 0));

6298

return retVal;

6299

}

6300

6301

void

6302

VFreeBitMapEntry_r(Errorbit32 * ec, Volume *vp, struct vnodeIndex *index,

6303

unsigned bitNumber, int flags)

6304

{

6305

unsigned int offset;

6306

6307

*ec = 0;

6308

6309

#ifdef AFS_DEMAND_ATTACH_FS1

6310

if (flags & VOL_FREE_BITMAP_WAIT0x1) {

6311

/* VAllocBitmapEntry_r allocs bitmap entries under an exclusive volume

6312

* state, so ensure we're not in an exclusive volume state when we update

6313

* the bitmap */

6314

VCreateReservation_r(vp);

6315

VWaitExclusiveState_r(vp);

6316

}

6317

#endif

6318

6319

#ifdef BITMAP_LATER

6320

if (!index->bitmap)

6321

goto done;

6322

#endif /* BITMAP_LATER */

6323

6324

offset = bitNumber >> 3;

6325

if (offset >= index->bitmapSize) {

6326

*ec = VNOVNODE102;

6327

goto done;

6328

}

6329

if (offset < index->bitmapOffset)

6330

index->bitmapOffset = offset & ~3; /* Truncate to nearest bit32 */

6331

*(index->bitmap + offset) &= ~(1 << (bitNumber & 0x7));

6332

6333

done:

6334

#ifdef AFS_DEMAND_ATTACH_FS1

6335

VCancelReservation_r(vp);

6336

#endif

6337

return; /* make the compiler happy for non-DAFS */

6338

}

6339

6340

void

6341

VFreeBitMapEntry(Errorbit32 * ec, Volume *vp, struct vnodeIndex *index,

6342

unsigned bitNumber)

6343

{

6344

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6344), 0));

6345

VFreeBitMapEntry_r(ec, vp, index, bitNumber, VOL_FREE_BITMAP_WAIT0x1);

6346

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6346), 0));

6347

}

6348

6349

/* this function will drop the glock internally.

6350

* for old pthread fileservers, this is safe thanks to vbusy.

6351

6352

* for demand attach fs, caller must have already called

6353

* VCreateReservation_r and VWaitExclusiveState_r */

6354

static void

6355

VGetBitmap_r(Errorbit32 * ec, Volume * vp, VnodeClass class)

6356

{

6357

StreamHandle_t *file;

6358

afs_sfsize_t nVnodes, size;

6359

struct VnodeClassInfo *vcp = &VnodeClassInfo[class];

6360

struct vnodeIndex *vip = &vp->vnodeIndex[class];

6361

struct VnodeDiskObject *vnode;

6362

unsigned int unique = 0;

6363

FdHandle_t *fdP;

6364

#ifdef BITMAP_LATER

6365

byte *BitMap = 0;

6366

#endif /* BITMAP_LATER */

6367

#ifdef AFS_DEMAND_ATTACH_FS1

6368

VolState state_save;

6369

#endif /* AFS_DEMAND_ATTACH_FS */

6370

6371

*ec = 0;

6372

6373

#ifdef AFS_DEMAND_ATTACH_FS1

6374

state_save = VChangeState_r(vp, VOL_STATE_GET_BITMAP);

6375

#endif /* AFS_DEMAND_ATTACH_FS */

6376

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6376), 0));

6377

6378

fdP = IH_OPEN(vip->handle)ih_open(vip->handle);

6379

osi_Assert(fdP != NULL)(void)((fdP != ((void *)0)) || (osi_AssertFailU("fdP != NULL"
, "./../vol/volume.c", 6379), 0));

6380

file = FDH_FDOPEN(fdP, "r")stream_fdopen((fdP)->fd_fd);

6381

osi_Assert(file != NULL)(void)((file != ((void *)0)) || (osi_AssertFailU("file != NULL"
, "./../vol/volume.c", 6381), 0));

6382

vnode = (VnodeDiskObject *) malloc(vcp->diskSize);

6383

osi_Assert(vnode != NULL)(void)((vnode != ((void *)0)) || (osi_AssertFailU("vnode != NULL"
, "./../vol/volume.c", 6383), 0));

6384

size = OS_SIZE(fdP->fd_fd)ih_size(fdP->fd_fd);

6385

osi_Assert(size != -1)(void)((size != -1) || (osi_AssertFailU("size != -1", "./../vol/volume.c"
, 6385), 0));

6386

nVnodes = (size <= vcp->diskSize ? 0 : size - vcp->diskSize)

6387

>> vcp->logSize;

6388

vip->bitmapSize = ((nVnodes / 8) + 10) / 4 * 4; /* The 10 is a little extra so

6389

* a few files can be created in this volume,

6390

* the whole thing is rounded up to nearest 4

6391

* bytes, because the bit map allocator likes

6392

* it that way */

6393

#ifdef BITMAP_LATER

6394

BitMap = (byte *) calloc(1, vip->bitmapSize);

6395

osi_Assert(BitMap != NULL)(void)((BitMap != ((void *)0)) || (osi_AssertFailU("BitMap != NULL"
, "./../vol/volume.c", 6395), 0));

6396

#else /* BITMAP_LATER */

6397

vip->bitmap = (byte *) calloc(1, vip->bitmapSize);

6398

osi_Assert(vip->bitmap != NULL)(void)((vip->bitmap != ((void *)0)) || (osi_AssertFailU("vip->bitmap != NULL"
, "./../vol/volume.c", 6398), 0));

6399

vip->bitmapOffset = 0;

6400

#endif /* BITMAP_LATER */

6401

if (STREAM_ASEEK(file, vcp->diskSize)stream_aseek(file, vcp->diskSize) != -1) {

6402

int bitNumber = 0;

6403

for (bitNumber = 0; bitNumber < nVnodes + 100; bitNumber++) {

6404

if (STREAM_READ(vnode, vcp->diskSize, 1, file)stream_read(vnode, vcp->diskSize, 1, file) != 1)

6405

break;

6406

if (vnode->type != vNull0) {

6407

if (vnode->vnodeMagic != vcp->magic) {

6408

Log("GetBitmap: addled vnode index in volume %s; volume needs salvage\n", V_name(vp)((vp)->header->diskstuff.name));

6409

*ec = VSALVAGE101;

6410

break;

6411

}

6412

#ifdef BITMAP_LATER

6413

*(BitMap + (bitNumber >> 3)) |= (1 << (bitNumber & 0x7));

6414

#else /* BITMAP_LATER */

6415

*(vip->bitmap + (bitNumber >> 3)) |= (1 << (bitNumber & 0x7));

6416

#endif /* BITMAP_LATER */

6417

if (unique <= vnode->uniquifier)

6418

unique = vnode->uniquifier + 1;

6419

}

6420

#ifndef AFS_PTHREAD_ENV1

6421

if ((bitNumber & 0x00ff) == 0x0ff) { /* every 256 iterations */

6422

IOMGR_Poll();

6423

}

6424

#endif /* !AFS_PTHREAD_ENV */

6425

}

6426

}

6427

if (vp->nextVnodeUnique < unique) {

6428

Log("GetBitmap: bad volume uniquifier for volume %s; volume needs salvage\n", V_name(vp)((vp)->header->diskstuff.name));

6429

*ec = VSALVAGE101;

6430

}

6431

/* Paranoia, partly justified--I think fclose after fdopen

6432

* doesn't seem to close fd. In any event, the documentation

6433

* doesn't specify, so it's safer to close it twice.

6434

6435

STREAM_CLOSE(file)stream_close(file, 0);

6436

FDH_CLOSE(fdP)(fd_close(fdP), (fdP)=((void *)0), 0);

6437

free(vnode);

6438

6439

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6439), 0));

6440

#ifdef BITMAP_LATER

6441

/* There may have been a racing condition with some other thread, both

6442

* creating the bitmaps for this volume. If the other thread was faster

6443

* the pointer to bitmap should already be filled and we can free ours.

6444

6445

if (vip->bitmap == NULL((void *)0)) {

6446

vip->bitmap = BitMap;

6447

vip->bitmapOffset = 0;

6448

} else

6449

free((byte *) BitMap);

6450

#endif /* BITMAP_LATER */

6451

#ifdef AFS_DEMAND_ATTACH_FS1

6452

VChangeState_r(vp, state_save);

6453

#endif /* AFS_DEMAND_ATTACH_FS */

6454

}

6455

6456

6457

/***************************************************/

6458

/* Volume Path and Volume Number utility routines */

6459

/***************************************************/

6460

6461

/**

6462

* find the first occurrence of a volume header file and return the path.

6463

6464

* @param[out] ec outbound error code

6465

* @param[in] volumeId volume id to find

6466

* @param[out] partitionp pointer to disk partition path string

6467

* @param[out] namep pointer to volume header file name string

6468

6469

* @post path to first occurrence of volume header is returned in partitionp

6470

* and namep, or ec is set accordingly.

6471

6472

* @warning this function is NOT re-entrant -- partitionp and namep point to

6473

* static data segments

6474

6475

* @note if a volume utility inadvertently leaves behind a stale volume header

6476

* on a vice partition, it is possible for callers to get the wrong one,

6477

* depending on the order of the disk partition linked list.

6478

6479

6480

void

6481

VGetVolumePath(Errorbit32 * ec, VolId volumeId, char **partitionp, char **namep)

6482

{

6483

static char partition[VMAXPATHLEN64], name[VMAXPATHLEN64];

6484

char path[VMAXPATHLEN64];

6485

int found = 0;

6486

struct DiskPartition64 *dp;

6487

6488

*ec = 0;

6489

name[0] = OS_DIRSEPC'/';

6490

snprintf(&name[1], (sizeof name) - 1, VFORMAT"V%010lu.vol",

6491

afs_printable_uint32_lu(volumeId));

6492

for (dp = DiskPartitionList; dp; dp = dp->next) {

6493

struct afs_stat_ststat status;

6494

strcpy(path, VPartitionPath(dp));

6495

strcat(path, name);

6496

if (afs_statstat(path, &status) == 0) {

6497

strcpy(partition, dp->name);

6498

found = 1;

6499

break;

6500

}

6501

}

6502

if (!found) {

6503

*ec = VNOVOL103;

6504

*partitionp = *namep = NULL((void *)0);

6505

} else {

6506

*partitionp = partition;

6507

*namep = name;

6508

}

6509

}

6510

6511

/**

6512

* extract a volume number from a volume header filename string.

6513

6514

* @param[in] name volume header filename string

6515

6516

* @return volume number

6517

6518

* @note the string must be of the form VFORMAT. the only permissible

6519

* deviation is a leading OS_DIRSEPC character.

6520

6521

* @see VFORMAT

6522

6523

int

6524

VolumeNumber(char *name)

6525

{

6526

if (*name == OS_DIRSEPC'/')

6527

name++;

6528

return strtoul(name + 1, NULL((void *)0), 10);

6529

}

6530

6531

/**

6532

* compute the volume header filename.

6533

6534

* @param[in] volumeId

6535

6536

* @return volume header filename

6537

6538

* @post volume header filename string is constructed

6539

6540

* @warning this function is NOT re-entrant -- the returned string is

6541

* stored in a static char array. see VolumeExternalName_r

6542

* for a re-entrant equivalent.

6543

6544

* @see VolumeExternalName_r

6545

6546

* @deprecated due to the above re-entrancy warning, this interface should

6547

* be considered deprecated. Please use VolumeExternalName_r

6548

* in its stead.

6549

6550

char *

6551

VolumeExternalName(VolumeId volumeId)

6552

{

6553

static char name[VMAXPATHLEN64];

6554

snprintf(name, sizeof name, VFORMAT"V%010lu.vol", afs_printable_uint32_lu(volumeId));

6555

return name;

6556

}

6557

6558

/**

6559

* compute the volume header filename.

6560

6561

* @param[in] volumeId

6562

* @param[inout] name array in which to store filename

6563

* @param[in] len length of name array

6564

6565

* @return result code from afs_snprintf

6566

6567

* @see VolumeExternalName

6568

* @see afs_snprintf

6569

6570

* @note re-entrant equivalent of VolumeExternalName

6571

6572

int

6573

VolumeExternalName_r(VolumeId volumeId, char * name, size_t len)

6574

{

6575

return snprintf(name, len, VFORMAT"V%010lu.vol", afs_printable_uint32_lu(volumeId));

6576

}

6577

6578

6579

/***************************************************/

6580

/* Volume Usage Statistics routines */

6581

/***************************************************/

6582

6583

#if OPENAFS_VOL_STATS1

6584

#define OneDay(86400) (86400) /* 24 hours' worth of seconds */

6585

#else

6586

#define OneDay(86400) (24*60*60) /* 24 hours */

6587

#endif /* OPENAFS_VOL_STATS */

6588

6589

static time_t

6590

Midnight(time_t t) {

6591

struct tm local, *l;

6592

time_t midnight;

6593

6594

#if defined(AFS_PTHREAD_ENV1) && !defined(AFS_NT40_ENV)

6595

l = localtime_r(&t, &local);

6596

#else

6597

l = localtime(&t);

6598

#endif

6599

6600

if (l != NULL((void *)0)) {

6601

/* the following is strictly speaking problematic on the

6602

switching day to daylight saving time, after the switch,

6603

as tm_isdst does not match. Similarly, on the looong day when

6604

switching back the OneDay check will not do what naively expected!

6605

The effects are minor, though, and more a matter of interpreting

6606

the numbers. */

6607

#ifndef AFS_PTHREAD_ENV1

6608

local = *l;

6609

#endif

6610

local.tm_hour = local.tm_min=local.tm_sec = 0;

6611

midnight = mktime(&local);

6612

if (midnight != (time_t) -1) return(midnight);

6613

}

6614

return( (t/OneDay(86400))*OneDay(86400) );

6615

6616

}

6617

6618

/*------------------------------------------------------------------------

6619

* [export] VAdjustVolumeStatistics

6620

6621

* Description:

6622

* If we've passed midnight, we need to update all the day use

6623

* statistics as well as zeroing the detailed volume statistics

6624

* (if we are implementing them).

6625

6626

* Arguments:

6627

* vp : Pointer to the volume structure describing the lucky

6628

* volume being considered for update.

6629

6630

* Returns:

6631

* 0 (always!)

6632

6633

* Environment:

6634

* Nothing interesting.

6635

6636

* Side Effects:

6637

* As described.

6638

*------------------------------------------------------------------------*/

6639

6640

int

6641

VAdjustVolumeStatistics_r(Volume * vp)

6642

{

6643

unsigned int now = FT_ApproxTime();

6644

6645

if (now - V_dayUseDate(vp)((vp)->header->diskstuff.dayUseDate) > OneDay(86400)) {

6646

int ndays, i;

6647

6648

ndays = (now - V_dayUseDate(vp)((vp)->header->diskstuff.dayUseDate)) / OneDay(86400);

6649

for (i = 6; i > ndays - 1; i--)

6650

V_weekUse(vp)((vp)->header->diskstuff.weekUse)[i] = V_weekUse(vp)((vp)->header->diskstuff.weekUse)[i - ndays];

6651

for (i = 0; i < ndays - 1 && i < 7; i++)

6652

V_weekUse(vp)((vp)->header->diskstuff.weekUse)[i] = 0;

6653

if (ndays <= 7)

6654

V_weekUse(vp)((vp)->header->diskstuff.weekUse)[ndays - 1] = V_dayUse(vp)((vp)->header->diskstuff.dayUse);

6655

V_dayUse(vp)((vp)->header->diskstuff.dayUse) = 0;

6656

V_dayUseDate(vp)((vp)->header->diskstuff.dayUseDate) = Midnight(now);

6657

6658

#if OPENAFS_VOL_STATS1

6659

6660

* All we need to do is bzero the entire VOL_STATS_BYTES of

6661

* the detailed volume statistics area.

6662

6663

memset((V_stat_area(vp)(((vp)->header->diskstuff.stat_reads))), 0, VOL_STATS_BYTES128);

6664

#endif /* OPENAFS_VOL_STATS */

6665

}

6666

6667

/*It's been more than a day of collection */

6668

6669

* Always return happily.

6670

6671

return (0);

6672

} /*VAdjustVolumeStatistics */

6673

6674

int

6675

VAdjustVolumeStatistics(Volume * vp)

6676

{

6677

int retVal;

6678

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6678), 0));

6679

retVal = VAdjustVolumeStatistics_r(vp);

6680

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6680), 0));

6681

return retVal;

6682

}

6683

6684

void

6685

VBumpVolumeUsage_r(Volume * vp)

6686

{

6687

unsigned int now = FT_ApproxTime();

6688

V_accessDate(vp)((vp)->header->diskstuff.accessDate) = now;

6689

if (now - V_dayUseDate(vp)((vp)->header->diskstuff.dayUseDate) > OneDay(86400))

6690

VAdjustVolumeStatistics_r(vp);

6691

6692

* Save the volume header image to disk after every 128 bumps to dayUse.

6693

6694

if ((V_dayUse(vp)((vp)->header->diskstuff.dayUse)++ & 127) == 0) {

6695

Errorbit32 error;

6696

VUpdateVolume_r(&error, vp, VOL_UPDATE_WAIT0x1);

6697

}

6698

}

6699

6700

void

6701

VBumpVolumeUsage(Volume * vp)

6702

{

6703

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6703), 0));

6704

VBumpVolumeUsage_r(vp);

6705

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6705), 0));

6706

}

6707

6708

void

6709

VSetDiskUsage_r(void)

6710

{

6711

#ifndef AFS_DEMAND_ATTACH_FS1

6712

static int FifteenMinuteCounter = 0;

6713

#endif

6714

6715

while (VInit < 2) {

6716

/* NOTE: Don't attempt to access the partitions list until the

6717

* initialization level indicates that all volumes are attached,

6718

* which implies that all partitions are initialized. */

6719

#ifdef AFS_PTHREAD_ENV1

6720

VOL_CV_WAIT(&vol_vinit_cond)(void)((pthread_cond_wait((&vol_vinit_cond), &vol_glock_mutex
) == 0) || (osi_AssertFailU("pthread_cond_wait((&vol_vinit_cond), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 6720), 0));

6721

#else /* AFS_PTHREAD_ENV */

6722

IOMGR_Sleep(10);

6723

#endif /* AFS_PTHREAD_ENV */

6724

}

6725

6726

VResetDiskUsage_r();

6727

6728

#ifndef AFS_DEMAND_ATTACH_FS1

6729

if (++FifteenMinuteCounter == 3) {

6730

FifteenMinuteCounter = 0;

6731

VScanUpdateList();

6732

}

6733

#endif /* !AFS_DEMAND_ATTACH_FS */

6734

}

6735

6736

void

6737

VSetDiskUsage(void)

6738

{

6739

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 6739), 0));

6740

VSetDiskUsage_r();

6741

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 6741), 0));

6742

}

6743

6744

6745

/***************************************************/

6746

/* Volume Update List routines */

6747

/***************************************************/

6748

6749

/* The number of minutes that a volume hasn't been updated before the

6750

* "Dont salvage" flag in the volume header will be turned on */

6751

#define SALVAGE_INTERVAL(10*60) (10*60)

6752

6753

6754

* demand attach fs

6755

6756

* volume update list functionality has been moved into the VLRU

6757

* the DONT_SALVAGE flag is now set during VLRU demotion

6758

6759

6760

#ifndef AFS_DEMAND_ATTACH_FS1

6761

static VolumeId *UpdateList = NULL((void *)0); /* Pointer to array of Volume ID's */

6762

static int nUpdatedVolumes = 0; /* Updated with entry in UpdateList, salvage after crash flag on */

6763

static int updateSize = 0; /* number of entries possible */

6764

#define UPDATE_LIST_SIZE 128 /* initial size increment (must be a power of 2!) */

6765

#endif /* !AFS_DEMAND_ATTACH_FS */

6766

6767

void

6768

VAddToVolumeUpdateList_r(Errorbit32 * ec, Volume * vp)

6769

{

6770

*ec = 0;

6771

vp->updateTime = FT_ApproxTime();

6772

if (V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) == 0)

6773

return;

6774

V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) = 0;

6775

VSyncVolume_r(ec, vp, 0);

6776

#ifdef AFS_DEMAND_ATTACH_FS1

6777

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_HDR_DONTSALV);

6778

#else /* !AFS_DEMAND_ATTACH_FS */

6779

if (*ec)

6780

return;

6781

if (UpdateList == NULL((void *)0)) {

6782

updateSize = UPDATE_LIST_SIZE;

6783

UpdateList = (VolumeId *) malloc(sizeof(VolumeId) * updateSize);

6784

} else {

6785

if (nUpdatedVolumes == updateSize) {

6786

updateSize <<= 1;

6787

if (updateSize > 524288) {

6788

Log("warning: there is likely a bug in the volume update scanner\n");

6789

return;

6790

}

6791

UpdateList =

6792

(VolumeId *) realloc(UpdateList,

6793

sizeof(VolumeId) * updateSize);

6794

}

6795

}

6796

osi_Assert(UpdateList != NULL)(void)((UpdateList != ((void *)0)) || (osi_AssertFailU("UpdateList != NULL"
, "./../vol/volume.c", 6796), 0));

6797

UpdateList[nUpdatedVolumes++] = V_id(vp)((vp)->header->diskstuff.id);

6798

#endif /* !AFS_DEMAND_ATTACH_FS */

6799

}

6800

6801

#ifndef AFS_DEMAND_ATTACH_FS1

6802

static void

6803

VScanUpdateList(void)

6804

{

6805

int i, gap;

6806

Volume *vp;

6807

Errorbit32 error;

6808

afs_uint32 now = FT_ApproxTime();

6809

/* Be careful with this code, since it works with interleaved calls to AddToVolumeUpdateList */

6810

for (i = gap = 0; i < nUpdatedVolumes; i++) {

6811

if (gap)

6812

UpdateList[i - gap] = UpdateList[i];

6813

6814

/* XXX this routine needlessly messes up the Volume LRU by

6815

* breaking the LRU temporal-locality assumptions.....

6816

* we should use a special volume header allocator here */

6817

vp = VGetVolume_r(&error, UpdateList[i - gap] = UpdateList[i]);

6818

if (error) {

6819

gap++;

6820

} else if (vp->nUsers == 1 && now - vp->updateTime > SALVAGE_INTERVAL(10*60)) {

6821

V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) = DONT_SALVAGE0xE5;

6822

VUpdateVolume_r(&error, vp, 0); /* No need to fsync--not critical */

6823

gap++;

6824

}

6825

6826

if (vp) {

6827

VPutVolume_r(vp);

6828

}

6829

6830

#ifndef AFS_PTHREAD_ENV1

6831

IOMGR_Poll();

6832

#endif /* !AFS_PTHREAD_ENV */

6833

}

6834

nUpdatedVolumes -= gap;

6835

}

6836

#endif /* !AFS_DEMAND_ATTACH_FS */

6837

6838

6839

/***************************************************/

6840

/* Volume LRU routines */

6841

/***************************************************/

6842

6843

/* demand attach fs

6844

* volume LRU

6845

6846

* with demand attach fs, we attempt to soft detach(1)

6847

* volumes which have not been accessed in a long time

6848

* in order to speed up fileserver shutdown

6849

6850

* (1) by soft detach we mean a process very similar

6851

* to VOffline, except the final state of the

6852

* Volume will be VOL_STATE_PREATTACHED, instead

6853

* of the usual VOL_STATE_UNATTACHED

6854

6855

#ifdef AFS_DEMAND_ATTACH_FS1

6856

6857

/* implementation is reminiscent of a generational GC

6858

6859

* queue 0 is newly attached volumes. this queue is

6860

* sorted by attach timestamp

6861

6862

* queue 1 is volumes that have been around a bit

6863

* longer than queue 0. this queue is sorted by

6864

* attach timestamp

6865

6866

* queue 2 is volumes tha have been around the longest.

6867

* this queue is unsorted

6868

6869

* queue 3 is volumes that have been marked as

6870

* candidates for soft detachment. this queue is

6871

* unsorted

6872

6873

#define VLRU_GENERATIONS3 3 /**< number of generations in VLRU */

6874

#define VLRU_QUEUES5 5 /**< total number of VLRU queues */

6875

6876

/**

6877

* definition of a VLRU queue.

6878

6879

struct VLRU_q {

6880

volatile struct rx_queue q;

6881

volatile int len;

6882

volatile int busy;

6883

pthread_cond_t cv;

6884

};

6885

6886

/**

6887

* main VLRU data structure.

6888

6889

struct VLRU {

6890

struct VLRU_q q[VLRU_QUEUES5]; /**< VLRU queues */

6891

6892

/* VLRU config */

6893

/** time interval (in seconds) between promotion passes for

6894

* each young generation queue. */

6895

afs_uint32 promotion_interval[VLRU_GENERATIONS3-1];

6896

6897

/** time interval (in seconds) between soft detach candidate

6898

* scans for each generation queue.

6899

6900

* scan_interval[VLRU_QUEUE_CANDIDATE] defines how frequently

6901

* we perform a soft detach pass. */

6902

afs_uint32 scan_interval[VLRU_GENERATIONS3+1];

6903

6904

/* scheduler state */

6905

int next_idx; /**< next queue to receive attention */

6906

afs_uint32 last_promotion[VLRU_GENERATIONS3-1]; /**< timestamp of last promotion scan */

6907

afs_uint32 last_scan[VLRU_GENERATIONS3+1]; /**< timestamp of last detach scan */

6908

6909

int scanner_state; /**< state of scanner thread */

6910

pthread_cond_t cv; /**< state transition CV */

6911

};

6912

6913

/** global VLRU state */

6914

static struct VLRU volume_LRU;

6915

6916

/**

6917

* defined states for VLRU scanner thread.

6918

6919

typedef enum {

6920

VLRU_SCANNER_STATE_OFFLINE = 0, /**< vlru scanner thread is offline */

6921

VLRU_SCANNER_STATE_ONLINE = 1, /**< vlru scanner thread is online */

6922

VLRU_SCANNER_STATE_SHUTTING_DOWN = 2, /**< vlru scanner thread is shutting down */

6923

VLRU_SCANNER_STATE_PAUSING = 3, /**< vlru scanner thread is getting ready to pause */

6924

VLRU_SCANNER_STATE_PAUSED = 4 /**< vlru scanner thread is paused */

6925

} vlru_thread_state_t;

6926

6927

/* vlru disk data header stuff */

6928

#define VLRU_DISK_MAGIC0x7a8b9cad 0x7a8b9cad /**< vlru disk entry magic number */

6929

#define VLRU_DISK_VERSION1 1 /**< vlru disk entry version number */

6930

6931

/** vlru default expiration time (for eventual fs state serialization of vlru data) */

6932

#define VLRU_DUMP_EXPIRATION_TIME(60*60*24*7) (60*60*24*7) /* expire vlru data after 1 week */

6933

6934

6935

/** minimum volume inactivity (in seconds) before a volume becomes eligible for

6936

* soft detachment. */

6937

static afs_uint32 VLRU_offline_thresh = VLRU_DEFAULT_OFFLINE_THRESH(60*60*2);

6938

6939

/** time interval (in seconds) between VLRU scanner thread soft detach passes. */

6940

static afs_uint32 VLRU_offline_interval = VLRU_DEFAULT_OFFLINE_INTERVAL(60*2);

6941

6942

/** maximum number of volumes to soft detach in a VLRU soft detach pass. */

6943

static afs_uint32 VLRU_offline_max = VLRU_DEFAULT_OFFLINE_MAX8;

6944

6945

/** VLRU control flag. non-zero value implies VLRU subsystem is activated. */

6946

static afs_uint32 VLRU_enabled = 1;

6947

6948

/* queue synchronization routines */

6949

static void VLRU_BeginExclusive_r(struct VLRU_q * q);

6950

static void VLRU_EndExclusive_r(struct VLRU_q * q);

6951

static void VLRU_Wait_r(struct VLRU_q * q);

6952

6953

/**

6954

* set VLRU subsystem tunable parameters.

6955

6956

* @param[in] option tunable option to modify

6957

* @param[in] val new value for tunable parameter

6958

6959

* @pre @c VInitVolumePackage2 has not yet been called.

6960

6961

* @post tunable parameter is modified

6962

6963

* @note DAFS only

6964

6965

* @note valid option parameters are:

6966

* @arg @c VLRU_SET_THRESH

6967

* set the period of inactivity after which

6968

* volumes are eligible for soft detachment

6969

* @arg @c VLRU_SET_INTERVAL

6970

* set the time interval between calls

6971

* to the volume LRU "garbage collector"

6972

* @arg @c VLRU_SET_MAX

6973

* set the max number of volumes to deallocate

6974

* in one GC pass

6975

6976

void

6977

VLRU_SetOptions(int option, afs_uint32 val)

6978

{

6979

if (option == VLRU_SET_THRESH1) {

6980

VLRU_offline_thresh = val;

6981

} else if (option == VLRU_SET_INTERVAL2) {

6982

VLRU_offline_interval = val;

6983

} else if (option == VLRU_SET_MAX3) {

6984

VLRU_offline_max = val;

6985

} else if (option == VLRU_SET_ENABLED4) {

6986

VLRU_enabled = val;

6987

}

6988

VLRU_ComputeConstants();

6989

}

6990

6991

/**

6992

* compute VLRU internal timing parameters.

6993

6994

* @post VLRU scanner thread internal timing parameters are computed

6995

6996

* @note computes internal timing parameters based upon user-modifiable

6997

* tunable parameters.

6998

6999

* @note DAFS only

7000

7001

* @internal volume package internal use only.

7002

7003

static void

7004

VLRU_ComputeConstants(void)

7005

{

7006

afs_uint32 factor = VLRU_offline_thresh / VLRU_offline_interval;

7007

7008

/* compute the candidate scan interval */

7009

volume_LRU.scan_interval[VLRU_QUEUE_CANDIDATE] = VLRU_offline_interval;

7010

7011

/* compute the promotion intervals */

7012

volume_LRU.promotion_interval[VLRU_QUEUE_NEW] = VLRU_offline_thresh * 2;

7013

volume_LRU.promotion_interval[VLRU_QUEUE_MID] = VLRU_offline_thresh * 4;

7014

7015

if (factor > 16) {

7016

/* compute the gen 0 scan interval */

7017

volume_LRU.scan_interval[VLRU_QUEUE_NEW] = VLRU_offline_thresh / 8;

7018

} else {

7019

/* compute the gen 0 scan interval */

7020

volume_LRU.scan_interval[VLRU_QUEUE_NEW] = VLRU_offline_interval * 2;

7021

}

7022

}

7023

7024

/**

7025

* initialize VLRU subsystem.

7026

7027

* @pre this function has not yet been called

7028

7029

* @post VLRU subsystem is initialized and VLRU scanner thread is starting

7030

7031

* @note DAFS only

7032

7033

* @internal volume package internal use only.

7034

7035

static void

7036

VInitVLRU(void)

7037

{

7038

pthread_t tid;

7039

pthread_attr_t attrs;

7040

int i;

7041

7042

if (!VLRU_enabled) {

7043

Log("VLRU: disabled\n");

7044

return;

7045

}

7046

7047

/* initialize each of the VLRU queues */

7048

for (i = 0; i < VLRU_QUEUES5; i++) {

7049

queue_Init(&volume_LRU.q[i])(((struct rx_queue *)(&volume_LRU.q[i])))->prev = (((struct
rx_queue *)(&volume_LRU.q[i])))->next = (((struct rx_queue
*)(&volume_LRU.q[i])));

7050

volume_LRU.q[i].len = 0;

7051

volume_LRU.q[i].busy = 0;

7052

CV_INIT(&volume_LRU.q[i].cv, "vol lru", CV_DEFAULT, 0)(void)((pthread_cond_init(&volume_LRU.q[i].cv, ((void *)0
)) == 0) || (osi_AssertFailU("pthread_cond_init(&volume_LRU.q[i].cv, NULL) == 0"
, "./../vol/volume.c", 7052), 0));

7053

}

7054

7055

/* setup the timing constants */

7056

VLRU_ComputeConstants();

7057

7058

/* XXX put inside LogLevel check? */

7059

Log("VLRU: starting scanner with the following configuration parameters:\n");

7060

Log("VLRU: offlining volumes after minimum of %d seconds of inactivity\n", VLRU_offline_thresh);

7061

Log("VLRU: running VLRU soft detach pass every %d seconds\n", VLRU_offline_interval);

7062

Log("VLRU: taking up to %d volumes offline per pass\n", VLRU_offline_max);

7063

Log("VLRU: scanning generation 0 for inactive volumes every %d seconds\n", volume_LRU.scan_interval[0]);

7064

Log("VLRU: scanning for promotion/demotion between generations 0 and 1 every %d seconds\n", volume_LRU.promotion_interval[0]);

7065

Log("VLRU: scanning for promotion/demotion between generations 1 and 2 every %d seconds\n", volume_LRU.promotion_interval[1]);

7066

7067

/* start up the VLRU scanner */

7068

volume_LRU.scanner_state = VLRU_SCANNER_STATE_OFFLINE;

7069

if (programType == fileServer) {

7070

CV_INIT(&volume_LRU.cv, "vol lru", CV_DEFAULT, 0)(void)((pthread_cond_init(&volume_LRU.cv, ((void *)0)) ==
0) || (osi_AssertFailU("pthread_cond_init(&volume_LRU.cv, NULL) == 0"
, "./../vol/volume.c", 7070), 0));

7071

osi_Assert(pthread_attr_init(&attrs) == 0)(void)((pthread_attr_init(&attrs) == 0) || (osi_AssertFailU
("pthread_attr_init(&attrs) == 0", "./../vol/volume.c", 7071
), 0));

7072

7073

osi_Assert(pthread_create(&tid, &attrs, &VLRU_ScannerThread, NULL) == 0)(void)((pthread_create(&tid, &attrs, &VLRU_ScannerThread
, ((void *)0)) == 0) || (osi_AssertFailU("pthread_create(&tid, &attrs, &VLRU_ScannerThread, NULL) == 0"
, "./../vol/volume.c", 7073), 0));

7074

}

7075

}

7076

7077

/**

7078

* initialize the VLRU-related fields of a newly allocated volume object.

7079

7080

* @param[in] vp pointer to volume object

7081

7082

* @pre

7083

* @arg @c VOL_LOCK is held.

7084

* @arg volume object is not on a VLRU queue.

7085

7086

* @post VLRU fields are initialized to indicate that volume object is not

7087

* currently registered with the VLRU subsystem

7088

7089

* @note DAFS only

7090

7091

* @internal volume package interal use only.

7092

7093

static void

7094

VLRU_Init_Node_r(Volume * vp)

7095

{

7096

if (!VLRU_enabled)

7097

return;

7098

7099

osi_Assert(queue_IsNotOnQueue(&vp->vlru))(void)(((((struct rx_queue *)(&vp->vlru))->next == 0
)) || (osi_AssertFailU("queue_IsNotOnQueue(&vp->vlru)"
, "./../vol/volume.c", 7099), 0));

7100

vp->vlru.idx = VLRU_QUEUE_INVALID;

7101

}

7102

7103

/**

7104

* add a volume object to a VLRU queue.

7105

7106

* @param[in] vp pointer to volume object

7107

7108

* @pre

7109

* @arg @c VOL_LOCK is held.

7110

* @arg caller MUST hold a lightweight ref on @p vp.

7111

* @arg caller MUST NOT hold exclusive ownership of the VLRU queue.

7112

7113

* @post the volume object is added to the appropriate VLRU queue

7114

7115

* @note if @c vp->vlru.idx contains the index of a valid VLRU queue,

7116

* then the volume is added to that queue. Otherwise, the value

7117

* @c VLRU_QUEUE_NEW is stored into @c vp->vlru.idx and the

7118

* volume is added to the NEW generation queue.

7119

7120

* @note @c VOL_LOCK may be dropped internally

7121

7122

* @note Volume state is temporarily set to @c VOL_STATE_VLRU_ADD

7123

* during the add operation, and is restored to the previous

7124

* state prior to return.

7125

7126

* @note DAFS only

7127

7128

* @internal volume package internal use only.

7129

7130

static void

7131

VLRU_Add_r(Volume * vp)

7132

{

7133

int idx;

7134

VolState state_save;

7135

7136

if (!VLRU_enabled)

7137

return;

7138

7139

if (queue_IsOnQueue(&vp->vlru)(((struct rx_queue *)(&vp->vlru))->next != 0))

7140

return;

7141

7142

state_save = VChangeState_r(vp, VOL_STATE_VLRU_ADD);

7143

7144

idx = vp->vlru.idx;

7145

if ((idx < 0) || (idx >= VLRU_QUEUE_INVALID)) {

7146

idx = VLRU_QUEUE_NEW;

7147

}

7148

7149

VLRU_Wait_r(&volume_LRU.q[idx]);

7150

7151

/* repeat check since VLRU_Wait_r may have dropped

7152

* the glock */

7153

if (queue_IsNotOnQueue(&vp->vlru)(((struct rx_queue *)(&vp->vlru))->next == 0)) {

7154

vp->vlru.idx = idx;

7155

queue_Prepend(&volume_LRU.q[idx], &vp->vlru)(((((struct rx_queue *)(&vp->vlru))->next=((struct rx_queue
*)(&volume_LRU.q[idx]))->next)->prev=((struct rx_queue
*)(&vp->vlru)))->prev=((struct rx_queue *)(&volume_LRU
.q[idx])), ((struct rx_queue *)(&volume_LRU.q[idx]))->
next=((struct rx_queue *)(&vp->vlru)));

7156

volume_LRU.q[idx].len++;

7157

V_attachFlags(vp)((vp)->attach_flags) |= VOL_ON_VLRU;

7158

vp->stats.last_promote = FT_ApproxTime();

7159

}

7160

7161

VChangeState_r(vp, state_save);

7162

}

7163

7164

/**

7165

* delete a volume object from a VLRU queue.

7166

7167

* @param[in] vp pointer to volume object

7168

7169

* @pre

7170

* @arg @c VOL_LOCK is held.

7171

* @arg caller MUST hold a lightweight ref on @p vp.

7172

* @arg caller MUST NOT hold exclusive ownership of the VLRU queue.

7173

7174

* @post volume object is removed from the VLRU queue

7175

7176

* @note @c VOL_LOCK may be dropped internally

7177

7178

* @note DAFS only

7179

7180

* @todo We should probably set volume state to something exlcusive

7181

* (as @c VLRU_Add_r does) prior to dropping @c VOL_LOCK.

7182

7183

* @internal volume package internal use only.

7184

7185

static void

7186

VLRU_Delete_r(Volume * vp)

7187

{

7188

int idx;

7189

7190

if (!VLRU_enabled)

7191

return;

7192

7193

if (queue_IsNotOnQueue(&vp->vlru)(((struct rx_queue *)(&vp->vlru))->next == 0))

7194

return;

7195

7196

/* handle races */

7197

do {

7198

idx = vp->vlru.idx;

7199

if (idx == VLRU_QUEUE_INVALID)

7200

return;

7201

VLRU_Wait_r(&volume_LRU.q[idx]);

7202

} while (idx != vp->vlru.idx);

7203

7204

/* now remove from the VLRU and update

7205

* the appropriate counter */

7206

queue_Remove(&vp->vlru)(((((struct rx_queue *)(&vp->vlru))->prev->next=
((struct rx_queue *)(&vp->vlru))->next)->prev=((
struct rx_queue *)(&vp->vlru))->prev), ((struct rx_queue
*)(&vp->vlru))->next = 0);

7207

volume_LRU.q[idx].len--;

7208

vp->vlru.idx = VLRU_QUEUE_INVALID;

7209

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_ON_VLRU);

7210

}

7211

7212

/**

7213

* tell the VLRU subsystem that a volume was just accessed.

7214

7215

* @param[in] vp pointer to volume object

7216

7217

* @pre

7218

* @arg @c VOL_LOCK is held

7219

* @arg caller MUST hold a lightweight ref on @p vp

7220

* @arg caller MUST NOT hold exclusive ownership of any VLRU queue

7221

7222

* @post volume VLRU access statistics are updated. If the volume was on

7223

* the VLRU soft detach candidate queue, it is moved to the NEW

7224

* generation queue.

7225

7226

* @note @c VOL_LOCK may be dropped internally

7227

7228

* @note DAFS only

7229

7230

* @internal volume package internal use only.

7231

7232

static void

7233

VLRU_UpdateAccess_r(Volume * vp)

7234

{

7235

Volume * rvp = NULL((void *)0);

7236

7237

if (!VLRU_enabled)

7238

return;

7239

7240

if (queue_IsNotOnQueue(&vp->vlru)(((struct rx_queue *)(&vp->vlru))->next == 0))

7241

return;

7242

7243

osi_Assert(V_attachFlags(vp) & VOL_ON_VLRU)(void)((((vp)->attach_flags) & VOL_ON_VLRU) || (osi_AssertFailU
("V_attachFlags(vp) & VOL_ON_VLRU", "./../vol/volume.c", 7243
), 0));

7244

7245

/* update the access timestamp */

7246

vp->stats.last_get = FT_ApproxTime();

7247

7248

7249

* if the volume is on the soft detach candidate

7250

* list, we need to safely move it back to a

7251

* regular generation. this has to be done

7252

* carefully so we don't race against the scanner

7253

* thread.

7254

7255

7256

/* if this volume is on the soft detach candidate queue,

7257

* then grab exclusive access to the necessary queues */

7258

if (vp->vlru.idx == VLRU_QUEUE_CANDIDATE) {

7259

rvp = vp;

7260

VCreateReservation_r(rvp);

7261

7262

VLRU_Wait_r(&volume_LRU.q[VLRU_QUEUE_NEW]);

7263

VLRU_BeginExclusive_r(&volume_LRU.q[VLRU_QUEUE_NEW]);

7264

VLRU_Wait_r(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]);

7265

VLRU_BeginExclusive_r(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]);

7266

}

7267

7268

/* make sure multiple threads don't race to update */

7269

if (vp->vlru.idx == VLRU_QUEUE_CANDIDATE) {

7270

VLRU_SwitchQueues(vp, VLRU_QUEUE_NEW, 1);

7271

}

7272

7273

if (rvp) {

7274

VLRU_EndExclusive_r(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]);

7275

VLRU_EndExclusive_r(&volume_LRU.q[VLRU_QUEUE_NEW]);

7276

VCancelReservation_r(rvp);

7277

}

7278

}

7279

7280

/**

7281

* switch a volume between two VLRU queues.

7282

7283

* @param[in] vp pointer to volume object

7284

* @param[in] new_idx index of VLRU queue onto which the volume will be moved

7285

* @param[in] append controls whether the volume will be appended or

7286

* prepended to the queue. A nonzero value means it will

7287

* be appended; zero means it will be prepended.

7288

7289

* @pre The new (and old, if applicable) queue(s) must either be owned

7290

* exclusively by the calling thread for asynchronous manipulation,

7291

* or the queue(s) must be quiescent and VOL_LOCK must be held.

7292

* Please see VLRU_BeginExclusive_r, VLRU_EndExclusive_r and VLRU_Wait_r

7293

* for further details of the queue asynchronous processing mechanism.

7294

7295

* @post If the volume object was already on a VLRU queue, it is

7296

* removed from the queue. Depending on the value of the append

7297

* parameter, the volume object is either appended or prepended

7298

* to the VLRU queue referenced by the new_idx parameter.

7299

7300

* @note DAFS only

7301

7302

* @see VLRU_BeginExclusive_r

7303

* @see VLRU_EndExclusive_r

7304

* @see VLRU_Wait_r

7305

7306

* @internal volume package internal use only.

7307

7308

static void

7309

VLRU_SwitchQueues(Volume * vp, int new_idx, int append)

7310

{

7311

if (queue_IsNotOnQueue(&vp->vlru)(((struct rx_queue *)(&vp->vlru))->next == 0))

7312

return;

7313

7314

7315

volume_LRU.q[vp->vlru.idx].len--;

7316

7317

/* put the volume back on the correct generational queue */

7318

if (append) {

7319

queue_Append(&volume_LRU.q[new_idx], &vp->vlru)(((((struct rx_queue *)(&vp->vlru))->prev=((struct rx_queue
*)(&volume_LRU.q[new_idx]))->prev)->next=((struct rx_queue
*)(&vp->vlru)))->next=((struct rx_queue *)(&volume_LRU
.q[new_idx])), ((struct rx_queue *)(&volume_LRU.q[new_idx
]))->prev=((struct rx_queue *)(&vp->vlru)));

7320

} else {

7321

queue_Prepend(&volume_LRU.q[new_idx], &vp->vlru)(((((struct rx_queue *)(&vp->vlru))->next=((struct rx_queue
*)(&volume_LRU.q[new_idx]))->next)->prev=((struct rx_queue
*)(&vp->vlru)))->prev=((struct rx_queue *)(&volume_LRU
.q[new_idx])), ((struct rx_queue *)(&volume_LRU.q[new_idx
]))->next=((struct rx_queue *)(&vp->vlru)));

7322

}

7323

7324

volume_LRU.q[new_idx].len++;

7325

vp->vlru.idx = new_idx;

7326

}

7327

7328

/**

7329

* VLRU background thread.

7330

7331

* The VLRU Scanner Thread is responsible for periodically scanning through

7332

* each VLRU queue looking for volumes which should be moved to another

7333

* queue, or soft detached.

7334

7335

* @param[in] args unused thread arguments parameter

7336

7337

* @return unused thread return value

7338

* @retval NULL always

7339

7340

* @internal volume package internal use only.

7341

7342

static void *

7343

VLRU_ScannerThread(void * args)

7344

{

7345

afs_uint32 now, min_delay, delay;

7346

int i, min_idx, min_op, overdue, state;

7347

7348

/* set t=0 for promotion cycle to be

7349

* fileserver startup */

7350

now = FT_ApproxTime();

7351

for (i=0; i < VLRU_GENERATIONS3-1; i++) {

7352

volume_LRU.last_promotion[i] = now;

7353

}

7354

7355

/* don't start the scanner until VLRU_offline_thresh

7356

* plus a small delay for VInitVolumePackage2 to finish

7357

* has gone by */

7358

7359

sleep(VLRU_offline_thresh + 60);

7360

7361

/* set t=0 for scan cycle to be now */

7362

now = FT_ApproxTime();

7363

for (i=0; i < VLRU_GENERATIONS3+1; i++) {

7364

volume_LRU.last_scan[i] = now;

7365

}

7366

7367

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 7367), 0));

7368

if (volume_LRU.scanner_state == VLRU_SCANNER_STATE_OFFLINE) {

7369

volume_LRU.scanner_state = VLRU_SCANNER_STATE_ONLINE;

7370

}

7371

7372

while ((state = volume_LRU.scanner_state) != VLRU_SCANNER_STATE_SHUTTING_DOWN) {

7373

/* check to see if we've been asked to pause */

7374

if (volume_LRU.scanner_state == VLRU_SCANNER_STATE_PAUSING) {

7375

volume_LRU.scanner_state = VLRU_SCANNER_STATE_PAUSED;

7376

CV_BROADCAST(&volume_LRU.cv)(void)((pthread_cond_broadcast(&volume_LRU.cv) == 0) || (
osi_AssertFailU("pthread_cond_broadcast(&volume_LRU.cv) == 0"
, "./../vol/volume.c", 7376), 0));

7377

do {

7378

VOL_CV_WAIT(&volume_LRU.cv)(void)((pthread_cond_wait((&volume_LRU.cv), &vol_glock_mutex
) == 0) || (osi_AssertFailU("pthread_cond_wait((&volume_LRU.cv), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 7378), 0));

7379

} while (volume_LRU.scanner_state == VLRU_SCANNER_STATE_PAUSED);

7380

}

7381

7382

/* scheduling can happen outside the glock */

7383

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 7383), 0));

7384

7385

/* figure out what is next on the schedule */

7386

7387

/* figure out a potential schedule for the new generation first */

7388

overdue = 0;

7389

min_delay = volume_LRU.scan_interval[0] + volume_LRU.last_scan[0] - now;

7390

min_idx = 0;

7391

min_op = 0;

7392

if (min_delay > volume_LRU.scan_interval[0]) {

7393

/* unsigned overflow -- we're overdue to run this scan */

7394

min_delay = 0;

7395

overdue = 1;

7396

}

7397

7398

/* if we're not overdue for gen 0, figure out schedule for candidate gen */

7399

if (!overdue) {

7400

i = VLRU_QUEUE_CANDIDATE;

7401

delay = volume_LRU.scan_interval[i] + volume_LRU.last_scan[i] - now;

7402

if (delay < min_delay) {

7403

min_delay = delay;

7404

min_idx = i;

7405

}

7406

if (delay > volume_LRU.scan_interval[i]) {

7407

/* unsigned overflow -- we're overdue to run this scan */

7408

min_delay = 0;

7409

min_idx = i;

7410

overdue = 1;

7411

}

7412

}

7413

7414

/* if we're still not overdue for something, figure out schedules for promotions */

7415

for (i=0; !overdue && i < VLRU_GENERATIONS3-1; i++) {

7416

delay = volume_LRU.promotion_interval[i] + volume_LRU.last_promotion[i] - now;

7417

if (delay < min_delay) {

7418

min_delay = delay;

7419

min_idx = i;

7420

min_op = 1;

7421

}

7422

if (delay > volume_LRU.promotion_interval[i]) {

7423

/* unsigned overflow -- we're overdue to run this promotion */

7424

min_delay = 0;

7425

min_idx = i;

7426

min_op = 1;

7427

overdue = 1;

7428

break;

7429

}

7430

}

7431

7432

/* sleep as needed */

7433

if (min_delay) {

7434

sleep(min_delay);

7435

}

7436

7437

/* do whatever is next */

7438

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 7438), 0));

7439

if (min_op) {

7440

VLRU_Promote_r(min_idx);

7441

VLRU_Demote_r(min_idx+1);

7442

} else {

7443

VLRU_Scan_r(min_idx);

7444

}

7445

now = FT_ApproxTime();

7446

}

7447

7448

Log("VLRU scanner asked to go offline (scanner_state=%d)\n", state);

7449

7450

/* signal that scanner is down */

7451

volume_LRU.scanner_state = VLRU_SCANNER_STATE_OFFLINE;

7452

CV_BROADCAST(&volume_LRU.cv)(void)((pthread_cond_broadcast(&volume_LRU.cv) == 0) || (
osi_AssertFailU("pthread_cond_broadcast(&volume_LRU.cv) == 0"
, "./../vol/volume.c", 7452), 0));

7453

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 7453), 0));

7454

return NULL((void *)0);

7455

}

7456

7457

/**

7458

* promote volumes from one VLRU generation to the next.

7459

7460

* This routine scans a VLRU generation looking for volumes which are

7461

* eligible to be promoted to the next generation. All volumes which

7462

* meet the eligibility requirement are promoted.

7463

7464

* Promotion eligibility is based upon meeting both of the following

7465

* requirements:

7466

7467

* @arg The volume has been accessed since the last promotion:

7468

* @c (vp->stats.last_get >= vp->stats.last_promote)

7469

* @arg The last promotion occurred at least

7470

* @c volume_LRU.promotion_interval[idx] seconds ago

7471

7472

* As a performance optimization, promotions are "globbed". In other

7473

* words, we promote arbitrarily large contiguous sublists of elements

7474

* as one operation.

7475

7476

* @param[in] idx VLRU queue index to scan

7477

7478

* @note DAFS only

7479

7480

* @internal VLRU internal use only.

7481

7482

static void

7483

VLRU_Promote_r(int idx)

7484

{

7485

int len, chaining, promote;

7486

afs_uint32 now, thresh;

7487

struct rx_queue *qp, *nqp;

7488

Volume * vp, *start = NULL((void *)0), *end = NULL((void *)0);

7489

7490

/* get exclusive access to two chains, and drop the glock */

7491

VLRU_Wait_r(&volume_LRU.q[idx]);

7492

VLRU_BeginExclusive_r(&volume_LRU.q[idx]);

7493

VLRU_Wait_r(&volume_LRU.q[idx+1]);

7494

VLRU_BeginExclusive_r(&volume_LRU.q[idx+1]);

7495

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 7495), 0));

7496

7497

thresh = volume_LRU.promotion_interval[idx];

7498

now = FT_ApproxTime();

7499

7500

len = chaining = 0;

7501

for (queue_ScanBackwards(&volume_LRU.q[idx], qp, nqp, rx_queue)(qp) = ((struct rx_queue *)((struct rx_queue *)(&volume_LRU
.q[idx]))->prev), nqp = ((struct rx_queue *)((struct rx_queue
*)(qp))->prev); !(((struct rx_queue *)(&volume_LRU.q[
idx])) == ((struct rx_queue *)(qp))); (qp) = nqp, nqp = ((struct
rx_queue *)((struct rx_queue *)(qp))->prev)) {

7502

vp = (Volume *)((char *)qp - offsetof(Volume, vlru)__builtin_offsetof(Volume, vlru));

7503

promote = (((vp->stats.last_promote + thresh) <= now) &&

7504

(vp->stats.last_get >= vp->stats.last_promote));

7505

7506

if (chaining) {

7507

if (promote) {

7508

vp->vlru.idx++;

7509

len++;

7510

start = vp;

7511

} else {

7512

/* promote and prepend chain */

7513

queue_MoveChainAfter(&volume_LRU.q[idx+1], &start->vlru, &end->vlru)if (((struct rx_queue *)(&volume_LRU.q[idx+1]))->next !=
((struct rx_queue *)(&start->vlru))) (((((struct rx_queue
*)(&end->vlru))->next->prev=((struct rx_queue *
)(&start->vlru))->prev)->next=((struct rx_queue *
)(&end->vlru))->next), ((((struct rx_queue *)(&
volume_LRU.q[idx+1]))->next->prev=((struct rx_queue *)(
&end->vlru)))->next=((struct rx_queue *)(&volume_LRU
.q[idx+1]))->next), ((((struct rx_queue *)(&start->
vlru))->prev=((struct rx_queue *)(&volume_LRU.q[idx+1]
)))->next=((struct rx_queue *)(&start->vlru))));

7514

chaining = 0;

7515

}

7516

} else {

7517

if (promote) {

7518

vp->vlru.idx++;

7519

len++;

7520

chaining = 1;

7521

start = end = vp;

7522

}

7523

}

7524

}

7525

7526

if (chaining) {

7527

/* promote and prepend */

7528

7529

}

7530

7531

if (len) {

7532

volume_LRU.q[idx].len -= len;

7533

volume_LRU.q[idx+1].len += len;

7534

}

7535

7536

/* release exclusive access to the two chains */

7537

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 7537), 0));

7538

volume_LRU.last_promotion[idx] = now;

7539

VLRU_EndExclusive_r(&volume_LRU.q[idx+1]);

7540

VLRU_EndExclusive_r(&volume_LRU.q[idx]);

7541

}

7542

7543

/* run the demotions */

7544

static void

7545

VLRU_Demote_r(int idx)

7546

{

7547

Errorbit32 ec;

7548

int len, chaining, demote;

7549

afs_uint32 now, thresh;

7550

struct rx_queue *qp, *nqp;

7551

Volume * vp, *start = NULL((void *)0), *end = NULL((void *)0);

7552

Volume ** salv_flag_vec = NULL((void *)0);

7553

int salv_vec_offset = 0;

7554

7555

osi_Assert(idx == VLRU_QUEUE_MID || idx == VLRU_QUEUE_OLD)(void)((idx == VLRU_QUEUE_MID || idx == VLRU_QUEUE_OLD) || (osi_AssertFailU
("idx == VLRU_QUEUE_MID || idx == VLRU_QUEUE_OLD", "./../vol/volume.c"
, 7555), 0));

7556

7557

/* get exclusive access to two chains, and drop the glock */

7558

VLRU_Wait_r(&volume_LRU.q[idx-1]);

7559

VLRU_BeginExclusive_r(&volume_LRU.q[idx-1]);

7560

VLRU_Wait_r(&volume_LRU.q[idx]);

7561

VLRU_BeginExclusive_r(&volume_LRU.q[idx]);

7562

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 7562), 0));

7563

7564

/* no big deal if this allocation fails */

7565

if (volume_LRU.q[idx].len) {

7566

salv_flag_vec = (Volume **) malloc(volume_LRU.q[idx].len * sizeof(Volume *));

7567

}

7568

7569

now = FT_ApproxTime();

7570

thresh = volume_LRU.promotion_interval[idx-1];

7571

7572

len = chaining = 0;

7573

7574

vp = (Volume *)((char *)qp - offsetof(Volume, vlru)__builtin_offsetof(Volume, vlru));

7575

demote = (((vp->stats.last_promote + thresh) <= now) &&

7576

(vp->stats.last_get < (now - thresh)));

7577

7578

/* we now do volume update list DONT_SALVAGE flag setting during

7579

* demotion passes */

7580

if (salv_flag_vec &&

7581

!(V_attachFlags(vp)((vp)->attach_flags) & VOL_HDR_DONTSALV) &&

7582

demote &&

7583

(vp->updateTime < (now - SALVAGE_INTERVAL(10*60))) &&

7584

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_ATTACHED)) {

7585

salv_flag_vec[salv_vec_offset++] = vp;

7586

VCreateReservation_r(vp);

7587

}

7588

7589

if (chaining) {

7590

if (demote) {

7591

vp->vlru.idx--;

7592

len++;

7593

start = vp;

7594

} else {

7595

/* demote and append chain */

7596

queue_MoveChainBefore(&volume_LRU.q[idx-1], &start->vlru, &end->vlru)if (((struct rx_queue *)(&volume_LRU.q[idx-1]))->prev !=
((struct rx_queue *)(&end->vlru))) (((((struct rx_queue
*)(&end->vlru))->next->prev=((struct rx_queue *
)(&start->vlru))->prev)->next=((struct rx_queue *
)(&end->vlru))->next), ((((struct rx_queue *)(&
volume_LRU.q[idx-1]))->prev->next=((struct rx_queue *)(
&start->vlru)))->prev=((struct rx_queue *)(&volume_LRU
.q[idx-1]))->prev), ((((struct rx_queue *)(&end->vlru
))->next=((struct rx_queue *)(&volume_LRU.q[idx-1])))->
prev=((struct rx_queue *)(&end->vlru))));

7597

chaining = 0;

7598

}

7599

} else {

7600

if (demote) {

7601

vp->vlru.idx--;

7602

len++;

7603

chaining = 1;

7604

start = end = vp;

7605

}

7606

}

7607

}

7608

7609

if (chaining) {

7610

7611

}

7612

7613

if (len) {

7614

volume_LRU.q[idx].len -= len;

7615

volume_LRU.q[idx-1].len += len;

7616

}

7617

7618

/* release exclusive access to the two chains */

7619

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 7619), 0));

7620

VLRU_EndExclusive_r(&volume_LRU.q[idx]);

7621

VLRU_EndExclusive_r(&volume_LRU.q[idx-1]);

7622

7623

/* now go back and set the DONT_SALVAGE flags as appropriate */

7624

if (salv_flag_vec) {

7625

int i;

7626

for (i = 0; i < salv_vec_offset; i++) {

7627

vp = salv_flag_vec[i];

7628

if (!(V_attachFlags(vp)((vp)->attach_flags) & VOL_HDR_DONTSALV) &&

7629

(vp->updateTime < (now - SALVAGE_INTERVAL(10*60))) &&

7630

(V_attachState(vp)((vp)->attach_state) == VOL_STATE_ATTACHED)) {

7631

ec = VHold_r(vp);

7632

if (!ec) {

7633

V_attachFlags(vp)((vp)->attach_flags) |= VOL_HDR_DONTSALV;

7634

V_dontSalvage(vp)((vp)->header->diskstuff.dontSalvage) = DONT_SALVAGE0xE5;

7635

VUpdateVolume_r(&ec, vp, 0);

7636

VPutVolume_r(vp);

7637

}

7638

}

7639

VCancelReservation_r(vp);

7640

}

7641

free(salv_flag_vec);

7642

}

7643

}

7644

7645

/* run a pass of the VLRU GC scanner */

7646

static void

7647

VLRU_Scan_r(int idx)

7648

{

7649

afs_uint32 now, thresh;

7650

struct rx_queue *qp, *nqp;

7651

Volume * vp;

7652

int i, locked = 1;

7653

7654

osi_Assert(idx == VLRU_QUEUE_NEW || idx == VLRU_QUEUE_CANDIDATE)(void)((idx == VLRU_QUEUE_NEW || idx == VLRU_QUEUE_CANDIDATE)
|| (osi_AssertFailU("idx == VLRU_QUEUE_NEW || idx == VLRU_QUEUE_CANDIDATE"
, "./../vol/volume.c", 7654), 0));

7655

7656

/* gain exclusive access to the idx VLRU */

7657

VLRU_Wait_r(&volume_LRU.q[idx]);

7658

VLRU_BeginExclusive_r(&volume_LRU.q[idx]);

7659

7660

if (idx != VLRU_QUEUE_CANDIDATE) {

7661

/* gain exclusive access to the candidate VLRU */

7662

VLRU_Wait_r(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]);

7663

VLRU_BeginExclusive_r(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]);

7664

}

7665

7666

now = FT_ApproxTime();

7667

thresh = now - VLRU_offline_thresh;

7668

7669

/* perform candidate selection and soft detaching */

7670

if (idx == VLRU_QUEUE_CANDIDATE) {

7671

/* soft detach some volumes from the candidate pool */

7672

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 7672), 0));

7673

locked = 0;

7674

7675

for (i=0,queue_ScanBackwards(&volume_LRU.q[idx], qp, nqp, rx_queue)(qp) = ((struct rx_queue *)((struct rx_queue *)(&volume_LRU
.q[idx]))->prev), nqp = ((struct rx_queue *)((struct rx_queue
*)(qp))->prev); !(((struct rx_queue *)(&volume_LRU.q[
idx])) == ((struct rx_queue *)(qp))); (qp) = nqp, nqp = ((struct
rx_queue *)((struct rx_queue *)(qp))->prev)) {

7676

vp = (Volume *)((char *)qp - offsetof(Volume, vlru)__builtin_offsetof(Volume, vlru));

7677

if (i >= VLRU_offline_max) {

7678

break;

7679

}

7680

/* check timestamp to see if it's a candidate for soft detaching */

7681

if (vp->stats.last_get <= thresh) {

7682

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 7682), 0));

7683

if (VCheckSoftDetach(vp, thresh))

7684

i++;

7685

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 7685), 0));

7686

}

7687

}

7688

} else {

7689

/* scan for volumes to become soft detach candidates */

7690

for (i=1,queue_ScanBackwards(&volume_LRU.q[idx], qp, nqp, rx_queue)(qp) = ((struct rx_queue *)((struct rx_queue *)(&volume_LRU
.q[idx]))->prev), nqp = ((struct rx_queue *)((struct rx_queue
*)(qp))->prev); !(((struct rx_queue *)(&volume_LRU.q[
idx])) == ((struct rx_queue *)(qp))); (qp) = nqp, nqp = ((struct
rx_queue *)((struct rx_queue *)(qp))->prev),i++) {

7691

vp = (Volume *)((char *)qp - offsetof(Volume, vlru)__builtin_offsetof(Volume, vlru));

7692

7693

/* check timestamp to see if it's a candidate for soft detaching */

7694

if (vp->stats.last_get <= thresh) {

7695

VCheckSoftDetachCandidate(vp, thresh);

7696

}

7697

7698

if (!(i&0x7f)) { /* lock coarsening optimization */

7699

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 7699), 0));

7700

pthread_yield()sleep(0);

7701

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 7701), 0));

7702

}

7703

}

7704

}

7705

7706

/* relinquish exclusive access to the VLRU chains */

7707

if (!locked) {

7708

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 7708), 0));

7709

}

7710

volume_LRU.last_scan[idx] = now;

7711

if (idx != VLRU_QUEUE_CANDIDATE) {

7712

VLRU_EndExclusive_r(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]);

7713

}

7714

VLRU_EndExclusive_r(&volume_LRU.q[idx]);

7715

}

7716

7717

/* check whether volume is safe to soft detach

7718

* caller MUST NOT hold a ref count on vp */

7719

static int

7720

VCheckSoftDetach(Volume * vp, afs_uint32 thresh)

7721

{

7722

int ret=0;

7723

7724

if (vp->nUsers || vp->nWaiters)

7725

return 0;

7726

7727

if (vp->stats.last_get <= thresh) {

7728

ret = VSoftDetachVolume_r(vp, thresh);

7729

}

7730

7731

return ret;

7732

}

7733

7734

/* check whether volume should be made a

7735

* soft detach candidate */

7736

static int

7737

VCheckSoftDetachCandidate(Volume * vp, afs_uint32 thresh)

7738

{

7739

int idx, ret = 0;

7740

if (vp->nUsers || vp->nWaiters)

7741

return 0;

7742

7743

idx = vp->vlru.idx;

7744

7745

osi_Assert(idx == VLRU_QUEUE_NEW)(void)((idx == VLRU_QUEUE_NEW) || (osi_AssertFailU("idx == VLRU_QUEUE_NEW"
, "./../vol/volume.c", 7745), 0));

7746

7747

if (vp->stats.last_get <= thresh) {

7748

/* move to candidate pool */

7749

7750

volume_LRU.q[VLRU_QUEUE_NEW].len--;

7751

queue_Prepend(&volume_LRU.q[VLRU_QUEUE_CANDIDATE], &vp->vlru)(((((struct rx_queue *)(&vp->vlru))->next=((struct rx_queue
*)(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]))->next)->prev
=((struct rx_queue *)(&vp->vlru)))->prev=((struct rx_queue
*)(&volume_LRU.q[VLRU_QUEUE_CANDIDATE])), ((struct rx_queue
*)(&volume_LRU.q[VLRU_QUEUE_CANDIDATE]))->next=((struct
rx_queue *)(&vp->vlru)));

7752

vp->vlru.idx = VLRU_QUEUE_CANDIDATE;

7753

volume_LRU.q[VLRU_QUEUE_CANDIDATE].len++;

7754

ret = 1;

7755

}

7756

7757

return ret;

7758

}

7759

7760

7761

/* begin exclusive access on VLRU */

7762

static void

7763

VLRU_BeginExclusive_r(struct VLRU_q * q)

7764

{

7765

osi_Assert(q->busy == 0)(void)((q->busy == 0) || (osi_AssertFailU("q->busy == 0"
, "./../vol/volume.c", 7765), 0));

7766

q->busy = 1;

7767

}

7768

7769

/* end exclusive access on VLRU */

7770

static void

7771

VLRU_EndExclusive_r(struct VLRU_q * q)

7772

{

7773

osi_Assert(q->busy)(void)((q->busy) || (osi_AssertFailU("q->busy", "./../vol/volume.c"
, 7773), 0));

7774

q->busy = 0;

7775

CV_BROADCAST(&q->cv)(void)((pthread_cond_broadcast(&q->cv) == 0) || (osi_AssertFailU
("pthread_cond_broadcast(&q->cv) == 0", "./../vol/volume.c"
, 7775), 0));

7776

}

7777

7778

/* wait for another thread to end exclusive access on VLRU */

7779

static void

7780

VLRU_Wait_r(struct VLRU_q * q)

7781

{

7782

while(q->busy) {

7783

VOL_CV_WAIT(&q->cv)(void)((pthread_cond_wait((&q->cv), &vol_glock_mutex
) == 0) || (osi_AssertFailU("pthread_cond_wait((&q->cv), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 7783), 0));

7784

}

7785

}

7786

7787

/* demand attach fs

7788

* volume soft detach

7789

7790

* caller MUST NOT hold a ref count on vp */

7791

static int

7792

VSoftDetachVolume_r(Volume * vp, afs_uint32 thresh)

7793

{

7794

afs_uint32 ts_save;

7795

int ret = 0;

7796

7797

osi_Assert(vp->vlru.idx == VLRU_QUEUE_CANDIDATE)(void)((vp->vlru.idx == VLRU_QUEUE_CANDIDATE) || (osi_AssertFailU
("vp->vlru.idx == VLRU_QUEUE_CANDIDATE", "./../vol/volume.c"
, 7797), 0));

7798

7799

ts_save = vp->stats.last_get;

7800

if (ts_save > thresh)

7801

return 0;

7802

7803

if (vp->nUsers || vp->nWaiters)

7804

return 0;

7805

7806

if (VIsExclusiveState(V_attachState(vp)((vp)->attach_state))) {

7807

return 0;

7808

}

7809

7810

switch (V_attachState(vp)((vp)->attach_state)) {

7811

case VOL_STATE_UNATTACHED:

7812

case VOL_STATE_PREATTACHED:

7813

case VOL_STATE_ERROR:

7814

case VOL_STATE_GOING_OFFLINE:

7815

case VOL_STATE_SHUTTING_DOWN:

7816

case VOL_STATE_SALVAGING:

7817

case VOL_STATE_DELETED:

7818

volume_LRU.q[vp->vlru.idx].len--;

7819

7820

/* create and cancel a reservation to

7821

* give the volume an opportunity to

7822

* be deallocated */

7823

VCreateReservation_r(vp);

7824

7825

vp->vlru.idx = VLRU_QUEUE_INVALID;

7826

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_ON_VLRU);

7827

VCancelReservation_r(vp);

7828

return 0;

7829

default:

7830

break;

7831

}

7832

7833

/* hold the volume and take it offline.

7834

* no need for reservations, as VHold_r

7835

* takes care of that internally. */

7836

if (VHold_r(vp) == 0) {

7837

/* vhold drops the glock, so now we should

7838

* check to make sure we aren't racing against

7839

* other threads. if we are racing, offlining vp

7840

* would be wasteful, and block the scanner for a while

7841

7842

if (vp->nWaiters ||

7843

(vp->nUsers > 1) ||

7844

(vp->shuttingDown) ||

7845

(vp->goingOffline) ||

7846

(vp->stats.last_get != ts_save)) {

7847

/* looks like we're racing someone else. bail */

7848

VPutVolume_r(vp);

7849

vp = NULL((void *)0);

7850

} else {

7851

/* pull it off the VLRU */

7852

osi_Assert(vp->vlru.idx == VLRU_QUEUE_CANDIDATE)(void)((vp->vlru.idx == VLRU_QUEUE_CANDIDATE) || (osi_AssertFailU
("vp->vlru.idx == VLRU_QUEUE_CANDIDATE", "./../vol/volume.c"
, 7852), 0));

7853

volume_LRU.q[VLRU_QUEUE_CANDIDATE].len--;

7854

7855

vp->vlru.idx = VLRU_QUEUE_INVALID;

7856

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_ON_VLRU);

7857

7858

/* take if offline */

7859

VOffline_r(vp, "volume has been soft detached");

7860

7861

/* invalidate the volume header cache */

7862

FreeVolumeHeader(vp);

7863

7864

/* update stats */

7865

IncUInt64(&VStats.soft_detaches)(*(&VStats.soft_detaches))++;

7866

vp->stats.soft_detaches++;

7867

7868

/* put in pre-attached state so demand

7869

* attacher can work on it */

7870

VChangeState_r(vp, VOL_STATE_PREATTACHED);

7871

ret = 1;

7872

}

7873

}

7874

return ret;

7875

}

7876

#endif /* AFS_DEMAND_ATTACH_FS */

7877

7878

7879

/***************************************************/

7880

/* Volume Header Cache routines */

7881

/***************************************************/

7882

7883

/**

7884

* volume header cache.

7885

7886

struct volume_hdr_LRU_t volume_hdr_LRU;

7887

7888

/**

7889

* initialize the volume header cache.

7890

7891

* @param[in] howMany number of header cache entries to preallocate

7892

7893

* @pre VOL_LOCK held. Function has never been called before.

7894

7895

* @post howMany cache entries are allocated, initialized, and added

7896

* to the LRU list. Header cache statistics are initialized.

7897

7898

* @note only applicable to fileServer program type. Should only be

7899

* called once during volume package initialization.

7900

7901

* @internal volume package internal use only.

7902

7903

static void

7904

VInitVolumeHeaderCache(afs_uint32 howMany)

7905

{

7906

struct volHeader *hp;

7907

if (programType != fileServer)

7908

return;

7909

queue_Init(&volume_hdr_LRU)(((struct rx_queue *)(&volume_hdr_LRU)))->prev = (((struct
rx_queue *)(&volume_hdr_LRU)))->next = (((struct rx_queue
*)(&volume_hdr_LRU)));

7910

volume_hdr_LRU.stats.free = 0;

7911

volume_hdr_LRU.stats.used = howMany;

7912

volume_hdr_LRU.stats.attached = 0;

7913

hp = (struct volHeader *)(calloc(howMany, sizeof(struct volHeader)));

7914

osi_Assert(hp != NULL)(void)((hp != ((void *)0)) || (osi_AssertFailU("hp != NULL", "./../vol/volume.c"
, 7914), 0));

7915

7916

while (howMany--)

7917

/* We are using ReleaseVolumeHeader to initialize the values on the header list

7918

* to ensure they have the right values

7919

7920

ReleaseVolumeHeader(hp++);

7921

}

7922

7923

/**

7924

* get a volume header and attach it to the volume object.

7925

7926

* @param[in] vp pointer to volume object

7927

7928

* @return cache entry status

7929

* @retval 0 volume header was newly attached; cache data is invalid

7930

* @retval 1 volume header was previously attached; cache data is valid

7931

7932

* @pre VOL_LOCK held. For DAFS, lightweight ref must be held on volume object.

7933

7934

* @post volume header attached to volume object. if necessary, header cache

7935

* entry on LRU is synchronized to disk. Header is removed from LRU list.

7936

7937

* @note VOL_LOCK may be dropped

7938

7939

* @warning this interface does not load header data from disk. it merely

7940

* attaches a header object to the volume object, and may sync the old

7941

* header cache data out to disk in the process.

7942

7943

* @internal volume package internal use only.

7944

7945

static int

7946

GetVolumeHeader(Volume * vp)

7947

{

7948

Errorbit32 error;

7949

struct volHeader *hd;

7950

int old;

7951

static int everLogged = 0;

7952

7953

#ifdef AFS_DEMAND_ATTACH_FS1

7954

VolState vp_save = 0, back_save = 0;

7955

7956

/* XXX debug 9/19/05 we've apparently got

7957

* a ref counting bug somewhere that's

7958

* breaking the nUsers == 0 => header on LRU

7959

* assumption */

7960

if (vp->header && queue_IsNotOnQueue(vp->header)(((struct rx_queue *)(vp->header))->next == 0)) {

7961

Log("nUsers == 0, but header not on LRU\n");

7962

return 1;

7963

}

7964

#endif

7965

7966

old = (vp->header != NULL((void *)0)); /* old == volume already has a header */

7967

7968

if (programType != fileServer) {

7969

/* for volume utilities, we allocate volHeaders as needed */

7970

if (!vp->header) {

7971

hd = (struct volHeader *)calloc(1, sizeof(*vp->header));

7972

osi_Assert(hd != NULL)(void)((hd != ((void *)0)) || (osi_AssertFailU("hd != NULL", "./../vol/volume.c"
, 7972), 0));

7973

vp->header = hd;

7974

hd->back = vp;

7975

#ifdef AFS_DEMAND_ATTACH_FS1

7976

V_attachFlags(vp)((vp)->attach_flags) |= VOL_HDR_ATTACHED;

7977

#endif

7978

}

7979

} else {

7980

/* for the fileserver, we keep a volume header cache */

7981

if (old) {

7982

/* the header we previously dropped in the lru is

7983

* still available. pull it off the lru and return */

7984

hd = vp->header;

7985

queue_Remove(hd)(((((struct rx_queue *)(hd))->prev->next=((struct rx_queue
*)(hd))->next)->prev=((struct rx_queue *)(hd))->prev
), ((struct rx_queue *)(hd))->next = 0);

7986

osi_Assert(hd->back == vp)(void)((hd->back == vp) || (osi_AssertFailU("hd->back == vp"
, "./../vol/volume.c", 7986), 0));

7987

#ifdef AFS_DEMAND_ATTACH_FS1

7988

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_HDR_IN_LRU);

7989

#endif

7990

} else {

7991

/* we need to grab a new element off the LRU */

7992

if (queue_IsNotEmpty(&volume_hdr_LRU)(((struct rx_queue *)(&volume_hdr_LRU))->next != ((struct
rx_queue *)(&volume_hdr_LRU)))) {

7993

/* grab an element and pull off of LRU */

7994

hd = queue_First(&volume_hdr_LRU, volHeader)((struct volHeader *)((struct rx_queue *)(&volume_hdr_LRU
))->next);

7995

queue_Remove(hd)(((((struct rx_queue *)(hd))->prev->next=((struct rx_queue
*)(hd))->next)->prev=((struct rx_queue *)(hd))->prev
), ((struct rx_queue *)(hd))->next = 0);

7996

} else {

7997

/* LRU is empty, so allocate a new volHeader

7998

* this is probably indicative of a leak, so let the user know */

7999

hd = (struct volHeader *)calloc(1, sizeof(struct volHeader));

8000

osi_Assert(hd != NULL)(void)((hd != ((void *)0)) || (osi_AssertFailU("hd != NULL", "./../vol/volume.c"
, 8000), 0));

8001

if (!everLogged) {

8002

Log("****Allocated more volume headers, probably leak****\n");

8003

everLogged = 1;

8004

}

8005

volume_hdr_LRU.stats.free++;

8006

}

8007

if (hd->back) {

8008

/* this header used to belong to someone else.

8009

* we'll need to check if the header needs to

8010

* be sync'd out to disk */

8011

8012

#ifdef AFS_DEMAND_ATTACH_FS1

8013

/* if hd->back were in an exclusive state, then

8014

* its volHeader would not be on the LRU... */

8015

osi_Assert(!VIsExclusiveState(V_attachState(hd->back)))(void)((!VIsExclusiveState(((hd->back)->attach_state)))
|| (osi_AssertFailU("!VIsExclusiveState(V_attachState(hd->back))"
, "./../vol/volume.c", 8015), 0));

8016

#endif

8017

8018

if (hd->diskstuff.inUse) {

8019

/* volume was in use, so we'll need to sync

8020

* its header to disk */

8021

8022

#ifdef AFS_DEMAND_ATTACH_FS1

8023

back_save = VChangeState_r(hd->back, VOL_STATE_UPDATING);

8024

vp_save = VChangeState_r(vp, VOL_STATE_HDR_ATTACHING);

8025

VCreateReservation_r(hd->back);

8026

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 8026), 0));

8027

#endif

8028

8029

WriteVolumeHeader_r(&error, hd->back);

8030

/* Ignore errors; catch them later */

8031

8032

#ifdef AFS_DEMAND_ATTACH_FS1

8033

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 8033), 0));

8034

#endif

8035

}

8036

8037

hd->back->header = NULL((void *)0);

8038

#ifdef AFS_DEMAND_ATTACH_FS1

8039

V_attachFlags(hd->back)((hd->back)->attach_flags) &= ~(VOL_HDR_ATTACHED | VOL_HDR_LOADED | VOL_HDR_IN_LRU);

8040

8041

if (hd->diskstuff.inUse) {

8042

VChangeState_r(hd->back, back_save);

8043

VCancelReservation_r(hd->back);

8044

VChangeState_r(vp, vp_save);

8045

}

8046

#endif

8047

} else {

8048

volume_hdr_LRU.stats.attached++;

8049

}

8050

hd->back = vp;

8051

vp->header = hd;

8052

#ifdef AFS_DEMAND_ATTACH_FS1

8053

V_attachFlags(vp)((vp)->attach_flags) |= VOL_HDR_ATTACHED;

8054

#endif

8055

}

8056

volume_hdr_LRU.stats.free--;

8057

volume_hdr_LRU.stats.used++;

8058

}

8059

IncUInt64(&VStats.hdr_gets)(*(&VStats.hdr_gets))++;

8060

#ifdef AFS_DEMAND_ATTACH_FS1

8061

IncUInt64(&vp->stats.hdr_gets)(*(&vp->stats.hdr_gets))++;

8062

vp->stats.last_hdr_get = FT_ApproxTime();

8063

#endif

8064

return old;

8065

}

8066

8067

8068

/**

8069

* make sure volume header is attached and contains valid cache data.

8070

8071

* @param[out] ec outbound error code

8072

* @param[in] vp pointer to volume object

8073

8074

* @pre VOL_LOCK held. For DAFS, lightweight ref held on vp.

8075

8076

* @post header cache entry attached, and loaded with valid data, or

8077

* *ec is nonzero, and the header is released back into the LRU.

8078

8079

* @internal volume package internal use only.

8080

8081

static void

8082

LoadVolumeHeader(Errorbit32 * ec, Volume * vp)

8083

{

8084

#ifdef AFS_DEMAND_ATTACH_FS1

8085

VolState state_save;

8086

afs_uint32 now;

8087

*ec = 0;

8088

8089

if (vp->nUsers == 0 && !GetVolumeHeader(vp)) {

8090

IncUInt64(&VStats.hdr_loads)(*(&VStats.hdr_loads))++;

8091

state_save = VChangeState_r(vp, VOL_STATE_HDR_LOADING);

8092

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 8092), 0));

8093

8094

ReadHeader(ec, V_diskDataHandle(vp)((vp)->diskDataHandle), (char *)&V_disk(vp)((vp)->header->diskstuff),

8095

sizeof(V_disk(vp)((vp)->header->diskstuff)), VOLUMEINFOMAGIC((bit32)0x78a1b2c5),

8096

VOLUMEINFOVERSION1);

8097

IncUInt64(&vp->stats.hdr_loads)(*(&vp->stats.hdr_loads))++;

8098

now = FT_ApproxTime();

8099

8100

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 8100), 0));

8101

if (!*ec) {

8102

V_attachFlags(vp)((vp)->attach_flags) |= VOL_HDR_LOADED;

8103

vp->stats.last_hdr_load = now;

8104

}

8105

VChangeState_r(vp, state_save);

8106

}

8107

#else /* AFS_DEMAND_ATTACH_FS */

8108

*ec = 0;

8109

if (vp->nUsers == 0 && !GetVolumeHeader(vp)) {

8110

IncUInt64(&VStats.hdr_loads)(*(&VStats.hdr_loads))++;

8111

8112

ReadHeader(ec, V_diskDataHandle(vp)((vp)->diskDataHandle), (char *)&V_disk(vp)((vp)->header->diskstuff),

8113

sizeof(V_disk(vp)((vp)->header->diskstuff)), VOLUMEINFOMAGIC((bit32)0x78a1b2c5),

8114

VOLUMEINFOVERSION1);

8115

}

8116

#endif /* AFS_DEMAND_ATTACH_FS */

8117

if (*ec) {

8118

/* maintain (nUsers==0) => header in LRU invariant */

8119

FreeVolumeHeader(vp);

8120

}

8121

}

8122

8123

/**

8124

* release a header cache entry back into the LRU list.

8125

8126

* @param[in] hd pointer to volume header cache object

8127

8128

* @pre VOL_LOCK held.

8129

8130

* @post header cache object appended onto end of LRU list.

8131

8132

* @note only applicable to fileServer program type.

8133

8134

* @note used to place a header cache entry back into the

8135

* LRU pool without invalidating it as a cache entry.

8136

8137

* @internal volume package internal use only.

8138

8139

static void

8140

ReleaseVolumeHeader(struct volHeader *hd)

8141

{

8142

if (programType != fileServer)

8143

return;

8144

if (!hd || queue_IsOnQueue(hd)(((struct rx_queue *)(hd))->next != 0)) /* no header, or header already released */

8145

return;

8146

queue_Append(&volume_hdr_LRU, hd)(((((struct rx_queue *)(hd))->prev=((struct rx_queue *)(&
volume_hdr_LRU))->prev)->next=((struct rx_queue *)(hd))
)->next=((struct rx_queue *)(&volume_hdr_LRU)), ((struct
rx_queue *)(&volume_hdr_LRU))->prev=((struct rx_queue
*)(hd)));

8147

#ifdef AFS_DEMAND_ATTACH_FS1

8148

if (hd->back) {

8149

V_attachFlags(hd->back)((hd->back)->attach_flags) |= VOL_HDR_IN_LRU;

8150

}

8151

#endif

8152

volume_hdr_LRU.stats.free++;

8153

volume_hdr_LRU.stats.used--;

8154

}

8155

8156

/**

8157

* free/invalidate a volume header cache entry.

8158

8159

* @param[in] vp pointer to volume object

8160

8161

* @pre VOL_LOCK is held.

8162

8163

* @post For fileserver, header cache entry is returned to LRU, and it is

8164

* invalidated as a cache entry. For volume utilities, the header

8165

* cache entry is freed.

8166

8167

* @note For fileserver, this should be utilized instead of ReleaseVolumeHeader

8168

* whenever it is necessary to invalidate the header cache entry.

8169

8170

* @see ReleaseVolumeHeader

8171

8172

* @internal volume package internal use only.

8173

8174

static void

8175

FreeVolumeHeader(Volume * vp)

8176

{

8177

struct volHeader *hd = vp->header;

8178

if (!hd)

8179

return;

8180

if (programType == fileServer) {

8181

ReleaseVolumeHeader(hd);

8182

hd->back = NULL((void *)0);

8183

} else {

8184

free(hd);

8185

}

8186

#ifdef AFS_DEMAND_ATTACH_FS1

8187

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_HDR_ATTACHED | VOL_HDR_IN_LRU | VOL_HDR_LOADED);

8188

#endif

8189

volume_hdr_LRU.stats.attached--;

8190

vp->header = NULL((void *)0);

8191

}

8192

8193

8194

/***************************************************/

8195

/* Volume Hash Table routines */

8196

/***************************************************/

8197

8198

/**

8199

* set size of volume object hash table.

8200

8201

* @param[in] logsize log(2) of desired hash table size

8202

8203

* @return operation status

8204

* @retval 0 success

8205

* @retval -1 failure

8206

8207

* @pre MUST be called prior to VInitVolumePackage2

8208

8209

* @post Volume Hash Table will have 2^logsize buckets

8210

8211

int

8212

VSetVolHashSize(int logsize)

8213

{

8214

/* 64 to 268435456 hash buckets seems like a reasonable range */

8215

if ((logsize < 6 ) || (logsize > 28)) {

8216

return -1;

8217

}

8218

8219

if (!VInit) {

8220

VolumeHashTable.Size = 1 << logsize;

8221

VolumeHashTable.Mask = VolumeHashTable.Size - 1;

8222

} else {

8223

/* we can't yet support runtime modification of this

8224

* parameter. we'll need a configuration rwlock to

8225

* make runtime modification feasible.... */

8226

return -1;

8227

}

8228

return 0;

8229

}

8230

8231

/**

8232

* initialize dynamic data structures for volume hash table.

8233

8234

* @post hash table is allocated, and fields are initialized.

8235

8236

* @internal volume package internal use only.

8237

8238

static void

8239

VInitVolumeHash(void)

8240

{

8241

int i;

8242

8243

VolumeHashTable.Table = (VolumeHashChainHead *) calloc(VolumeHashTable.Size,

8244

sizeof(VolumeHashChainHead));

8245

osi_Assert(VolumeHashTable.Table != NULL)(void)((VolumeHashTable.Table != ((void *)0)) || (osi_AssertFailU
("VolumeHashTable.Table != NULL", "./../vol/volume.c", 8245),
0));

8246

8247

for (i=0; i < VolumeHashTable.Size; i++) {

8248

queue_Init(&VolumeHashTable.Table[i])(((struct rx_queue *)(&VolumeHashTable.Table[i])))->prev
= (((struct rx_queue *)(&VolumeHashTable.Table[i])))->
next = (((struct rx_queue *)(&VolumeHashTable.Table[i])));

8249

#ifdef AFS_DEMAND_ATTACH_FS1

8250

CV_INIT(&VolumeHashTable.Table[i].chain_busy_cv, "vhash busy", CV_DEFAULT, 0)(void)((pthread_cond_init(&VolumeHashTable.Table[i].chain_busy_cv
, ((void *)0)) == 0) || (osi_AssertFailU("pthread_cond_init(&VolumeHashTable.Table[i].chain_busy_cv, NULL) == 0"
, "./../vol/volume.c", 8250), 0));

8251

#endif /* AFS_DEMAND_ATTACH_FS */

8252

}

8253

}

8254

8255

/**

8256

* add a volume object to the hash table.

8257

8258

* @param[in] vp pointer to volume object

8259

* @param[in] hashid hash of volume id

8260

8261

* @pre VOL_LOCK is held. For DAFS, caller must hold a lightweight

8262

* reference on vp.

8263

8264

* @post volume is added to hash chain.

8265

8266

* @internal volume package internal use only.

8267

8268

* @note For DAFS, VOL_LOCK may be dropped in order to wait for an

8269

* asynchronous hash chain reordering to finish.

8270

8271

static void

8272

AddVolumeToHashTable(Volume * vp, int hashid)

8273

{

8274

VolumeHashChainHead * head;

8275

8276

if (queue_IsOnQueue(vp)(((struct rx_queue *)(vp))->next != 0))

8277

return;

8278

8279

head = &VolumeHashTable.Table[VOLUME_HASH(hashid)(hashid&(VolumeHashTable.Mask))];

8280

8281

#ifdef AFS_DEMAND_ATTACH_FS1

8282

/* wait for the hash chain to become available */

8283

VHashWait_r(head);

8284

8285

V_attachFlags(vp)((vp)->attach_flags) |= VOL_IN_HASH;

8286

vp->chainCacheCheck = ++head->cacheCheck;

8287

#endif /* AFS_DEMAND_ATTACH_FS */

8288

8289

head->len++;

8290

vp->hashid = hashid;

8291

queue_Append(head, vp)(((((struct rx_queue *)(vp))->prev=((struct rx_queue *)(head
))->prev)->next=((struct rx_queue *)(vp)))->next=((struct
rx_queue *)(head)), ((struct rx_queue *)(head))->prev=((struct
rx_queue *)(vp)));

8292

vp->vnodeHashOffset = VolumeHashOffset_r();

8293

}

8294

8295

/**

8296

* delete a volume object from the hash table.

8297

8298

* @param[in] vp pointer to volume object

8299

8300

* @pre VOL_LOCK is held. For DAFS, caller must hold a lightweight

8301

* reference on vp.

8302

8303

* @post volume is removed from hash chain.

8304

8305

* @internal volume package internal use only.

8306

8307

* @note For DAFS, VOL_LOCK may be dropped in order to wait for an

8308

* asynchronous hash chain reordering to finish.

8309

8310

static void

8311

DeleteVolumeFromHashTable(Volume * vp)

8312

{

8313

VolumeHashChainHead * head;

8314

8315

if (!queue_IsOnQueue(vp)(((struct rx_queue *)(vp))->next != 0))

8316

return;

8317

8318

head = &VolumeHashTable.Table[VOLUME_HASH(vp->hashid)(vp->hashid&(VolumeHashTable.Mask))];

8319

8320

#ifdef AFS_DEMAND_ATTACH_FS1

8321

/* wait for the hash chain to become available */

8322

VHashWait_r(head);

8323

8324

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_IN_HASH);

8325

head->cacheCheck++;

8326

#endif /* AFS_DEMAND_ATTACH_FS */

8327

8328

head->len--;

8329

queue_Remove(vp)(((((struct rx_queue *)(vp))->prev->next=((struct rx_queue
*)(vp))->next)->prev=((struct rx_queue *)(vp))->prev
), ((struct rx_queue *)(vp))->next = 0);

8330

/* do NOT reset hashid to zero, as the online

8331

* salvager package may need to know the volume id

8332

* after the volume is removed from the hash */

8333

}

8334

8335

/**

8336

* lookup a volume object in the hash table given a volume id.

8337

8338

* @param[out] ec error code return

8339

* @param[in] volumeId volume id

8340

* @param[in] hint volume object which we believe could be the correct

8341

mapping

8342

8343

* @return volume object pointer

8344

* @retval NULL no such volume id is registered with the hash table.

8345

8346

* @pre VOL_LOCK is held. For DAFS, caller must hold a lightweight

8347

ref on hint.

8348

8349

* @post volume object with the given id is returned. volume object and

8350

* hash chain access statistics are updated. hash chain may have

8351

* been reordered.

8352

8353

* @note For DAFS, VOL_LOCK may be dropped in order to wait for an

8354

* asynchronous hash chain reordering operation to finish, or

8355

* in order for us to perform an asynchronous chain reordering.

8356

8357

* @note Hash chain reorderings occur when the access count for the

8358

* volume object being looked up exceeds the sum of the previous

8359

* node's (the node ahead of it in the hash chain linked list)

8360

* access count plus the constant VOLUME_HASH_REORDER_THRESHOLD.

8361

8362

* @note For DAFS, the hint parameter allows us to short-circuit if the

8363

* cacheCheck fields match between the hash chain head and the

8364

* hint volume object.

8365

8366

Volume *

8367

VLookupVolume_r(Errorbit32 * ec, VolId volumeId, Volume * hint)

8368

{

8369

int looks = 0;

8370

Volume * vp, *np;

8371

#ifdef AFS_DEMAND_ATTACH_FS1

8372

Volume *pp;

8373

#endif

8374

VolumeHashChainHead * head;

8375

*ec = 0;

8376

8377

head = &VolumeHashTable.Table[VOLUME_HASH(volumeId)(volumeId&(VolumeHashTable.Mask))];

8378

8379

#ifdef AFS_DEMAND_ATTACH_FS1

8380

/* wait for the hash chain to become available */

8381

VHashWait_r(head);

8382

8383

/* check to see if we can short circuit without walking the hash chain */

8384

if (hint && (hint->chainCacheCheck == head->cacheCheck)) {

8385

IncUInt64(&hint->stats.hash_short_circuits)(*(&hint->stats.hash_short_circuits))++;

8386

return hint;

8387

}

8388

#endif /* AFS_DEMAND_ATTACH_FS */

8389

8390

/* someday we need to either do per-chain locks, RWlocks,

8391

* or both for volhash access.

8392

* (and move to a data structure with better cache locality) */

8393

8394

/* search the chain for this volume id */

8395

for(queue_Scan(head, vp, np, Volume)(vp) = ((struct Volume *)((struct rx_queue *)(head))->next
), np = ((struct Volume *)((struct rx_queue *)(vp))->next)
; !(((struct rx_queue *)(head)) == ((struct rx_queue *)(vp)))
; (vp) = (np), np = ((struct Volume *)((struct rx_queue *)(vp
))->next)) {

8396

looks++;

8397

if ((vp->hashid == volumeId)) {

8398

break;

8399

}

8400

}

8401

8402

if (queue_IsEnd(head, vp)(((struct rx_queue *)(head)) == ((struct rx_queue *)(vp)))) {

8403

vp = NULL((void *)0);

8404

}

8405

8406

#ifdef AFS_DEMAND_ATTACH_FS1

8407

/* update hash chain statistics */

8408

{

8409

afs_uint64 lks;

8410

FillInt64(lks, 0, looks)(lks) = ((afs_int64)(0) << 32) | (looks);;

8411

AddUInt64(head->looks, lks, &head->looks)*(&head->looks) = (afs_uint64)(head->looks) + (afs_uint64
)(lks);

8412

AddUInt64(VStats.hash_looks, lks, &VStats.hash_looks)*(&VStats.hash_looks) = (afs_uint64)(VStats.hash_looks) +
(afs_uint64)(lks);

8413

IncUInt64(&head->gets)(*(&head->gets))++;

8414

}

8415

8416

if (vp) {

8417

afs_uint64 thresh;

8418

IncUInt64(&vp->stats.hash_lookups)(*(&vp->stats.hash_lookups))++;

8419

8420

/* for demand attach fileserver, we permit occasional hash chain reordering

8421

* so that frequently looked up volumes move towards the head of the chain */

8422

pp = queue_Prev(vp, Volume)((struct Volume *)((struct rx_queue *)(vp))->prev);

8423

if (!queue_IsEnd(head, pp)(((struct rx_queue *)(head)) == ((struct rx_queue *)(pp)))) {

8424

FillInt64(thresh, 0, VOLUME_HASH_REORDER_THRESHOLD)(thresh) = ((afs_int64)(0) << 32) | (200);;

8425

AddUInt64(thresh, pp->stats.hash_lookups, &thresh)*(&thresh) = (afs_uint64)(thresh) + (afs_uint64)(pp->stats
.hash_lookups);

8426

if (GEInt64(vp->stats.hash_lookups, thresh)((vp->stats.hash_lookups) >= (thresh))) {

8427

VReorderHash_r(head, pp, vp);

8428

}

8429

}

8430

8431

/* update the short-circuit cache check */

8432

vp->chainCacheCheck = head->cacheCheck;

8433

}

8434

#endif /* AFS_DEMAND_ATTACH_FS */

8435

8436

return vp;

8437

}

8438

8439

#ifdef AFS_DEMAND_ATTACH_FS1

8440

/* perform volume hash chain reordering.

8441

8442

* advance a subchain beginning at vp ahead of

8443

* the adjacent subchain ending at pp */

8444

static void

8445

VReorderHash_r(VolumeHashChainHead * head, Volume * pp, Volume * vp)

8446

{

8447

Volume *tp, *np, *lp;

8448

afs_uint64 move_thresh;

8449

8450

/* this should never be called if the chain is already busy, so

8451

* no need to wait for other exclusive chain ops to finish */

8452

8453

/* this is a rather heavy set of operations,

8454

* so let's set the chain busy flag and drop

8455

* the vol_glock */

8456

VHashBeginExclusive_r(head);

8457

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 8457), 0));

8458

8459

/* scan forward in the chain from vp looking for the last element

8460

* in the chain we want to advance */

8461

FillInt64(move_thresh, 0, VOLUME_HASH_REORDER_CHAIN_THRESH)(move_thresh) = ((afs_int64)(0) << 32) | ((200 / 2));;

8462

AddUInt64(move_thresh, pp->stats.hash_lookups, &move_thresh)*(&move_thresh) = (afs_uint64)(move_thresh) + (afs_uint64
)(pp->stats.hash_lookups);

8463

for(queue_ScanFrom(head, vp, tp, np, Volume)(tp) = (struct Volume*)(vp), np = ((struct Volume *)((struct rx_queue
*)(tp))->next); !(((struct rx_queue *)(head)) == ((struct
rx_queue *)(tp))); (tp) = (np), np = ((struct Volume *)((struct
rx_queue *)(tp))->next)) {

8464

if (LTInt64(tp->stats.hash_lookups, move_thresh)((tp->stats.hash_lookups) < (move_thresh))) {

8465

break;

8466

}

8467

}

8468

lp = queue_Prev(tp, Volume)((struct Volume *)((struct rx_queue *)(tp))->prev);

8469

8470

/* scan backwards from pp to determine where to splice and

8471

* insert the subchain we're advancing */

8472

for(queue_ScanBackwardsFrom(head, pp, tp, np, Volume)(tp) = (struct Volume*)(pp), np = ((struct Volume *)((struct rx_queue
*)(tp))->prev); !(((struct rx_queue *)(head)) == ((struct
rx_queue *)(tp))); (tp) = np, np = ((struct Volume *)((struct
rx_queue *)(tp))->prev)) {

8473

if (GTInt64(tp->stats.hash_lookups, move_thresh)((tp->stats.hash_lookups) > (move_thresh))) {

8474

break;

8475

}

8476

}

8477

tp = queue_Next(tp, Volume)((struct Volume *)((struct rx_queue *)(tp))->next);

8478

8479

/* rebalance chain(vp,...,lp) ahead of chain(tp,...,pp) */

8480

queue_MoveChainBefore(tp,vp,lp)if (((struct rx_queue *)(tp))->prev != ((struct rx_queue *
)(lp))) (((((struct rx_queue *)(lp))->next->prev=((struct
rx_queue *)(vp))->prev)->next=((struct rx_queue *)(lp)
)->next), ((((struct rx_queue *)(tp))->prev->next=((
struct rx_queue *)(vp)))->prev=((struct rx_queue *)(tp))->
prev), ((((struct rx_queue *)(lp))->next=((struct rx_queue
*)(tp)))->prev=((struct rx_queue *)(lp))));

8481

8482

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 8482), 0));

8483

IncUInt64(&VStats.hash_reorders)(*(&VStats.hash_reorders))++;

8484

head->cacheCheck++;

8485

IncUInt64(&head->reorders)(*(&head->reorders))++;

8486

8487

/* wake up any threads waiting for the hash chain */

8488

VHashEndExclusive_r(head);

8489

}

8490

8491

8492

/* demand-attach fs volume hash

8493

* asynchronous exclusive operations */

8494

8495

/**

8496

* begin an asynchronous exclusive operation on a volume hash chain.

8497

8498

* @param[in] head pointer to volume hash chain head object

8499

8500

* @pre VOL_LOCK held. hash chain is quiescent.

8501

8502

* @post hash chain marked busy.

8503

8504

* @note this interface is used in conjunction with VHashEndExclusive_r and

8505

* VHashWait_r to perform asynchronous (wrt VOL_LOCK) operations on a

8506

* volume hash chain. Its main use case is hash chain reordering, which

8507

* has the potential to be a highly latent operation.

8508

8509

* @see VHashEndExclusive_r

8510

* @see VHashWait_r

8511

8512

* @note DAFS only

8513

8514

* @internal volume package internal use only.

8515

8516

static void

8517

VHashBeginExclusive_r(VolumeHashChainHead * head)

8518

{

8519

osi_Assert(head->busy == 0)(void)((head->busy == 0) || (osi_AssertFailU("head->busy == 0"
, "./../vol/volume.c", 8519), 0));

8520

head->busy = 1;

8521

}

8522

8523

/**

8524

* relinquish exclusive ownership of a volume hash chain.

8525

8526

* @param[in] head pointer to volume hash chain head object

8527

8528

* @pre VOL_LOCK held. thread owns the hash chain exclusively.

8529

8530

* @post hash chain is marked quiescent. threads awaiting use of

8531

* chain are awakened.

8532

8533

* @see VHashBeginExclusive_r

8534

* @see VHashWait_r

8535

8536

* @note DAFS only

8537

8538

* @internal volume package internal use only.

8539

8540

static void

8541

VHashEndExclusive_r(VolumeHashChainHead * head)

8542

{

8543

osi_Assert(head->busy)(void)((head->busy) || (osi_AssertFailU("head->busy", "./../vol/volume.c"
, 8543), 0));

8544

head->busy = 0;

8545

CV_BROADCAST(&head->chain_busy_cv)(void)((pthread_cond_broadcast(&head->chain_busy_cv) ==
0) || (osi_AssertFailU("pthread_cond_broadcast(&head->chain_busy_cv) == 0"
, "./../vol/volume.c", 8545), 0));

8546

}

8547

8548

/**

8549

* wait for all asynchronous operations on a hash chain to complete.

8550

8551

* @param[in] head pointer to volume hash chain head object

8552

8553

* @pre VOL_LOCK held.

8554

8555

* @post hash chain object is quiescent.

8556

8557

* @see VHashBeginExclusive_r

8558

* @see VHashEndExclusive_r

8559

8560

* @note DAFS only

8561

8562

* @note This interface should be called before any attempt to

8563

* traverse the hash chain. It is permissible for a thread

8564

* to gain exclusive access to the chain, and then perform

8565

* latent operations on the chain asynchronously wrt the

8566

* VOL_LOCK.

8567

8568

* @warning if waiting is necessary, VOL_LOCK is dropped

8569

8570

* @internal volume package internal use only.

8571

8572

static void

8573

VHashWait_r(VolumeHashChainHead * head)

8574

{

8575

while (head->busy) {

8576

VOL_CV_WAIT(&head->chain_busy_cv)(void)((pthread_cond_wait((&head->chain_busy_cv), &
vol_glock_mutex) == 0) || (osi_AssertFailU("pthread_cond_wait((&head->chain_busy_cv), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 8576), 0));

8577

}

8578

}

8579

#endif /* AFS_DEMAND_ATTACH_FS */

8580

8581

8582

/***************************************************/

8583

/* Volume by Partition List routines */

8584

/***************************************************/

8585

8586

8587

* demand attach fileserver adds a

8588

* linked list of volumes to each

8589

* partition object, thus allowing

8590

* for quick enumeration of all

8591

* volumes on a partition

8592

8593

8594

#ifdef AFS_DEMAND_ATTACH_FS1

8595

/**

8596

* add a volume to its disk partition VByPList.

8597

8598

* @param[in] vp pointer to volume object

8599

8600

* @pre either the disk partition VByPList is owned exclusively

8601

* by the calling thread, or the list is quiescent and

8602

* VOL_LOCK is held.

8603

8604

* @post volume is added to disk partition VByPList

8605

8606

* @note DAFS only

8607

8608

* @warning it is the caller's responsibility to ensure list

8609

* quiescence.

8610

8611

* @see VVByPListWait_r

8612

* @see VVByPListBeginExclusive_r

8613

* @see VVByPListEndExclusive_r

8614

8615

* @internal volume package internal use only.

8616

8617

static void

8618

AddVolumeToVByPList_r(Volume * vp)

8619

{

8620

if (queue_IsNotOnQueue(&vp->vol_list)(((struct rx_queue *)(&vp->vol_list))->next == 0)) {

8621

queue_Append(&vp->partition->vol_list, &vp->vol_list)(((((struct rx_queue *)(&vp->vol_list))->prev=((struct
rx_queue *)(&vp->partition->vol_list))->prev)->
next=((struct rx_queue *)(&vp->vol_list)))->next=((
struct rx_queue *)(&vp->partition->vol_list)), ((struct
rx_queue *)(&vp->partition->vol_list))->prev=((
struct rx_queue *)(&vp->vol_list)));

8622

V_attachFlags(vp)((vp)->attach_flags) |= VOL_ON_VBYP_LIST;

8623

vp->partition->vol_list.len++;

8624

}

8625

}

8626

8627

/**

8628

* delete a volume from its disk partition VByPList.

8629

8630

* @param[in] vp pointer to volume object

8631

8632

* @pre either the disk partition VByPList is owned exclusively

8633

* by the calling thread, or the list is quiescent and

8634

* VOL_LOCK is held.

8635

8636

* @post volume is removed from the disk partition VByPList

8637

8638

* @note DAFS only

8639

8640

* @warning it is the caller's responsibility to ensure list

8641

* quiescence.

8642

8643

* @see VVByPListWait_r

8644

* @see VVByPListBeginExclusive_r

8645

* @see VVByPListEndExclusive_r

8646

8647

* @internal volume package internal use only.

8648

8649

static void

8650

DeleteVolumeFromVByPList_r(Volume * vp)

8651

{

8652

if (queue_IsOnQueue(&vp->vol_list)(((struct rx_queue *)(&vp->vol_list))->next != 0)) {

8653

queue_Remove(&vp->vol_list)(((((struct rx_queue *)(&vp->vol_list))->prev->next
=((struct rx_queue *)(&vp->vol_list))->next)->prev
=((struct rx_queue *)(&vp->vol_list))->prev), ((struct
rx_queue *)(&vp->vol_list))->next = 0);

8654

V_attachFlags(vp)((vp)->attach_flags) &= ~(VOL_ON_VBYP_LIST);

8655

vp->partition->vol_list.len--;

8656

}

8657

}

8658

8659

/**

8660

* begin an asynchronous exclusive operation on a VByPList.

8661

8662

* @param[in] dp pointer to disk partition object

8663

8664

* @pre VOL_LOCK held. VByPList is quiescent.

8665

8666

* @post VByPList marked busy.

8667

8668

* @note this interface is used in conjunction with VVByPListEndExclusive_r and

8669

* VVByPListWait_r to perform asynchronous (wrt VOL_LOCK) operations on a

8670

* VByPList.

8671

8672

* @see VVByPListEndExclusive_r

8673

* @see VVByPListWait_r

8674

8675

* @note DAFS only

8676

8677

* @internal volume package internal use only.

8678

8679

/* take exclusive control over the list */

8680

static void

8681

VVByPListBeginExclusive_r(struct DiskPartition64 * dp)

8682

{

8683

osi_Assert(dp->vol_list.busy == 0)(void)((dp->vol_list.busy == 0) || (osi_AssertFailU("dp->vol_list.busy == 0"
, "./../vol/volume.c", 8683), 0));

8684

dp->vol_list.busy = 1;

8685

}

8686

8687

/**

8688

* relinquish exclusive ownership of a VByPList.

8689

8690

* @param[in] dp pointer to disk partition object

8691

8692

* @pre VOL_LOCK held. thread owns the VByPList exclusively.

8693

8694

* @post VByPList is marked quiescent. threads awaiting use of

8695

* the list are awakened.

8696

8697

* @see VVByPListBeginExclusive_r

8698

* @see VVByPListWait_r

8699

8700

* @note DAFS only

8701

8702

* @internal volume package internal use only.

8703

8704

static void

8705

VVByPListEndExclusive_r(struct DiskPartition64 * dp)

8706

{

8707

osi_Assert(dp->vol_list.busy)(void)((dp->vol_list.busy) || (osi_AssertFailU("dp->vol_list.busy"
, "./../vol/volume.c", 8707), 0));

8708

dp->vol_list.busy = 0;

8709

CV_BROADCAST(&dp->vol_list.cv)(void)((pthread_cond_broadcast(&dp->vol_list.cv) == 0)
|| (osi_AssertFailU("pthread_cond_broadcast(&dp->vol_list.cv) == 0"
, "./../vol/volume.c", 8709), 0));

8710

}

8711

8712

/**

8713

* wait for all asynchronous operations on a VByPList to complete.

8714

8715

* @param[in] dp pointer to disk partition object

8716

8717

* @pre VOL_LOCK is held.

8718

8719

* @post disk partition's VByP list is quiescent

8720

8721

* @note DAFS only

8722

8723

* @note This interface should be called before any attempt to

8724

* traverse the VByPList. It is permissible for a thread

8725

* to gain exclusive access to the list, and then perform

8726

* latent operations on the list asynchronously wrt the

8727

* VOL_LOCK.

8728

8729

* @warning if waiting is necessary, VOL_LOCK is dropped

8730

8731

* @see VVByPListEndExclusive_r

8732

* @see VVByPListBeginExclusive_r

8733

8734

* @internal volume package internal use only.

8735

8736

static void

8737

VVByPListWait_r(struct DiskPartition64 * dp)

8738

{

8739

while (dp->vol_list.busy) {

8740

VOL_CV_WAIT(&dp->vol_list.cv)(void)((pthread_cond_wait((&dp->vol_list.cv), &vol_glock_mutex
) == 0) || (osi_AssertFailU("pthread_cond_wait((&dp->vol_list.cv), &vol_glock_mutex) == 0"
, "./../vol/volume.c", 8740), 0));

8741

}

8742

}

8743

#endif /* AFS_DEMAND_ATTACH_FS */

8744

8745

/***************************************************/

8746

/* Volume Cache Statistics routines */

8747

/***************************************************/

8748

8749

void

8750

VPrintCacheStats_r(void)

8751

{

8752

struct VnodeClassInfo *vcp;

8753

vcp = &VnodeClassInfo[vLarge0];

8754

Log("Large vnode cache, %d entries, %d allocs, %d gets (%d reads), %d writes\n", vcp->cacheSize, vcp->allocs, vcp->gets, vcp->reads, vcp->writes);

8755

vcp = &VnodeClassInfo[vSmall1];

8756

Log("Small vnode cache,%d entries, %d allocs, %d gets (%d reads), %d writes\n", vcp->cacheSize, vcp->allocs, vcp->gets, vcp->reads, vcp->writes);

8757

Log("Volume header cache, %d entries, %"AFS_INT64_FMT"lld"" gets, "

8758

"%"AFS_INT64_FMT"lld"" replacements\n",

8759

VStats.hdr_cache_size, VStats.hdr_gets, VStats.hdr_loads);

8760

}

8761

8762

void

8763

VPrintCacheStats(void)

8764

{

8765

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 8765), 0));

8766

VPrintCacheStats_r();

8767

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 8767), 0));

8768

}

8769

8770

#ifdef AFS_DEMAND_ATTACH_FS1

8771

static double

8772

UInt64ToDouble(afs_uint64 * x)

8773

{

8774

static double c32 = 4.0 * 1.073741824 * 1000000000.0;

8775

afs_uint32 h, l;

8776

SplitInt64(*x, h, l)(h) = ((afs_int64)*x) >> 32; (l) = (*x) & 0xFFFFFFFF
;;

8777

return (((double)h) * c32) + ((double) l);

8778

}

8779

8780

static char *

8781

DoubleToPrintable(double x, char * buf, int len)

8782

{

8783

static double billion = 1000000000.0;

8784

afs_uint32 y[3];

8785

8786

y[0] = (afs_uint32) (x / (billion * billion));

8787

y[1] = (afs_uint32) ((x - (((double)y[0]) * billion * billion)) / billion);

8788

y[2] = (afs_uint32) (x - ((((double)y[0]) * billion * billion) + (((double)y[1]) * billion)));

8789

8790

if (y[0]) {

8791

snprintf(buf, len, "%d%09d%09d", y[0], y[1], y[2]);

8792

} else if (y[1]) {

8793

snprintf(buf, len, "%d%09d", y[1], y[2]);

8794

} else {

8795

snprintf(buf, len, "%d", y[2]);

8796

}

8797

buf[len-1] = '\0';

8798

return buf;

8799

}

8800

8801

struct VLRUExtStatsEntry {

8802

VolumeId volid;

8803

};

8804

8805

struct VLRUExtStats {

8806

afs_uint32 len;

8807

afs_uint32 used;

8808

struct {

8809

afs_uint32 start;

8810

afs_uint32 len;

8811

} queue_info[VLRU_QUEUE_INVALID];

8812

struct VLRUExtStatsEntry * vec;

8813

};

8814

8815

/**

8816

* add a 256-entry fudge factor onto the vector in case state changes

8817

* out from under us.

8818

8819

#define VLRU_EXT_STATS_VEC_LEN_FUDGE256 256

8820

8821

/**

8822

* collect extended statistics for the VLRU subsystem.

8823

8824

* @param[out] stats pointer to stats structure to be populated

8825

* @param[in] nvols number of volumes currently known to exist

8826

8827

* @pre VOL_LOCK held

8828

8829

* @post stats->vec allocated and populated

8830

8831

* @return operation status

8832

* @retval 0 success

8833

* @retval 1 failure

8834

8835

static int

8836

VVLRUExtStats_r(struct VLRUExtStats * stats, afs_uint32 nvols)

8837

{

8838

afs_uint32 cur, idx, len;

8839

struct rx_queue * qp, * nqp;

8840

Volume * vp;

8841

struct VLRUExtStatsEntry * vec;

8842

8843

len = nvols + VLRU_EXT_STATS_VEC_LEN_FUDGE256;

8844

vec = stats->vec = calloc(len,

8845

sizeof(struct VLRUExtStatsEntry));

8846

if (vec == NULL((void *)0)) {

8847

return 1;

8848

}

8849

8850

cur = 0;

8851

for (idx = VLRU_QUEUE_NEW; idx < VLRU_QUEUE_INVALID; idx++) {

8852

VLRU_Wait_r(&volume_LRU.q[idx]);

8853

VLRU_BeginExclusive_r(&volume_LRU.q[idx]);

8854

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 8854), 0));

8855

8856

stats->queue_info[idx].start = cur;

8857

8858

for (queue_Scan(&volume_LRU.q[idx], qp, nqp, rx_queue)(qp) = ((struct rx_queue *)((struct rx_queue *)(&volume_LRU
.q[idx]))->next), nqp = ((struct rx_queue *)((struct rx_queue
*)(qp))->next); !(((struct rx_queue *)(&volume_LRU.q[
idx])) == ((struct rx_queue *)(qp))); (qp) = (nqp), nqp = ((struct
rx_queue *)((struct rx_queue *)(qp))->next)) {

8859

if (cur == len) {

8860

/* out of space in vec */

8861

break;

8862

}

8863

vp = (Volume *)((char *)qp - offsetof(Volume, vlru)__builtin_offsetof(Volume, vlru));

8864

vec[cur].volid = vp->hashid;

8865

cur++;

8866

}

8867

8868

stats->queue_info[idx].len = cur - stats->queue_info[idx].start;

8869

8870

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 8870), 0));

8871

VLRU_EndExclusive_r(&volume_LRU.q[idx]);

8872

}

8873

8874

stats->len = len;

8875

stats->used = cur;

8876

return 0;

8877

}

8878

8879

#define ENUMTOSTRING(en)"en" #en

8880

#define ENUMCASE(en)case en: return "en" \

8881

case en: return ENUMTOSTRING(en)"en"

8882

8883

static char *

8884

vlru_idx_to_string(int idx)

8885

{

8886

switch (idx) {

8887

ENUMCASE(VLRU_QUEUE_NEW)case VLRU_QUEUE_NEW: return "VLRU_QUEUE_NEW";

8888

ENUMCASE(VLRU_QUEUE_MID)case VLRU_QUEUE_MID: return "VLRU_QUEUE_MID";

8889

ENUMCASE(VLRU_QUEUE_OLD)case VLRU_QUEUE_OLD: return "VLRU_QUEUE_OLD";

8890

ENUMCASE(VLRU_QUEUE_CANDIDATE)case VLRU_QUEUE_CANDIDATE: return "VLRU_QUEUE_CANDIDATE";

8891

ENUMCASE(VLRU_QUEUE_HELD)case VLRU_QUEUE_HELD: return "VLRU_QUEUE_HELD";

8892

ENUMCASE(VLRU_QUEUE_INVALID)case VLRU_QUEUE_INVALID: return "VLRU_QUEUE_INVALID";

8893

default:

8894

return "**UNKNOWN**";

8895

}

8896

}

8897

8898

void

8899

VPrintExtendedCacheStats_r(int flags)

8900

{

8901

int i;

8902

afs_uint32 vol_sum = 0;

8903

struct stats {

8904

double min;

8905

double max;

8906

double sum;

8907

double avg;

8908

};

8909

struct stats looks, gets, reorders, len;

8910

struct stats ch_looks, ch_gets, ch_reorders;

8911

char pr_buf[4][32];

8912

VolumeHashChainHead *head;

8913

Volume *vp, *np;

8914

struct VLRUExtStats vlru_stats;

8915

8916

/* zero out stats */

8917

memset(&looks, 0, sizeof(struct stats));

8918

memset(&gets, 0, sizeof(struct stats));

8919

memset(&reorders, 0, sizeof(struct stats));

8920

memset(&len, 0, sizeof(struct stats));

8921

memset(&ch_looks, 0, sizeof(struct stats));

8922

memset(&ch_gets, 0, sizeof(struct stats));

8923

memset(&ch_reorders, 0, sizeof(struct stats));

8924

8925

for (i = 0; i < VolumeHashTable.Size; i++) {

8926

head = &VolumeHashTable.Table[i];

8927

8928

VHashWait_r(head);

8929

VHashBeginExclusive_r(head);

8930

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 8930), 0));

8931

8932

ch_looks.sum = UInt64ToDouble(&head->looks);

8933

ch_gets.sum = UInt64ToDouble(&head->gets);

8934

ch_reorders.sum = UInt64ToDouble(&head->reorders);

8935

8936

/* update global statistics */

8937

{

8938

looks.sum += ch_looks.sum;

8939

gets.sum += ch_gets.sum;

8940

reorders.sum += ch_reorders.sum;

8941

len.sum += (double)head->len;

8942

vol_sum += head->len;

8943

8944

if (i == 0) {

8945

len.min = (double) head->len;

8946

len.max = (double) head->len;

8947

looks.min = ch_looks.sum;

8948

looks.max = ch_looks.sum;

8949

gets.min = ch_gets.sum;

8950

gets.max = ch_gets.sum;

8951

reorders.min = ch_reorders.sum;

8952

reorders.max = ch_reorders.sum;

8953

} else {

8954

if (((double)head->len) < len.min)

8955

len.min = (double) head->len;

8956

if (((double)head->len) > len.max)

8957

len.max = (double) head->len;

8958

if (ch_looks.sum < looks.min)

8959

looks.min = ch_looks.sum;

8960

else if (ch_looks.sum > looks.max)

8961

looks.max = ch_looks.sum;

8962

if (ch_gets.sum < gets.min)

8963

gets.min = ch_gets.sum;

8964

else if (ch_gets.sum > gets.max)

8965

gets.max = ch_gets.sum;

8966

if (ch_reorders.sum < reorders.min)

8967

reorders.min = ch_reorders.sum;

8968

else if (ch_reorders.sum > reorders.max)

8969

reorders.max = ch_reorders.sum;

8970

}

8971

}

8972

8973

if ((flags & VOL_STATS_PER_CHAIN20x2) && queue_IsNotEmpty(head)(((struct rx_queue *)(head))->next != ((struct rx_queue *)
(head)))) {

8974

/* compute detailed per-chain stats */

8975

struct stats hdr_loads, hdr_gets;

8976

double v_looks, v_loads, v_gets;

8977

8978

/* initialize stats with data from first element in chain */

8979

vp = queue_First(head, Volume)((struct Volume *)((struct rx_queue *)(head))->next);

8980

v_looks = UInt64ToDouble(&vp->stats.hash_lookups);

8981

v_loads = UInt64ToDouble(&vp->stats.hdr_loads);

8982

v_gets = UInt64ToDouble(&vp->stats.hdr_gets);

8983

ch_gets.min = ch_gets.max = v_looks;

8984

hdr_loads.min = hdr_loads.max = v_loads;

8985

hdr_gets.min = hdr_gets.max = v_gets;

8986

hdr_loads.sum = hdr_gets.sum = 0;

8987

8988

vp = queue_Next(vp, Volume)((struct Volume *)((struct rx_queue *)(vp))->next);

8989

8990

/* pull in stats from remaining elements in chain */

8991

for (queue_ScanFrom(head, vp, vp, np, Volume)(vp) = (struct Volume*)(vp), np = ((struct Volume *)((struct rx_queue
*)(vp))->next); !(((struct rx_queue *)(head)) == ((struct
rx_queue *)(vp))); (vp) = (np), np = ((struct Volume *)((struct
rx_queue *)(vp))->next)) {

8992

v_looks = UInt64ToDouble(&vp->stats.hash_lookups);

8993

v_loads = UInt64ToDouble(&vp->stats.hdr_loads);

8994

v_gets = UInt64ToDouble(&vp->stats.hdr_gets);

8995

8996

hdr_loads.sum += v_loads;

8997

hdr_gets.sum += v_gets;

8998

8999

if (v_looks < ch_gets.min)

9000

ch_gets.min = v_looks;

9001

else if (v_looks > ch_gets.max)

9002

ch_gets.max = v_looks;

9003

9004

if (v_loads < hdr_loads.min)

9005

hdr_loads.min = v_loads;

9006

else if (v_loads > hdr_loads.max)

9007

hdr_loads.max = v_loads;

9008

9009

if (v_gets < hdr_gets.min)

9010

hdr_gets.min = v_gets;

9011

else if (v_gets > hdr_gets.max)

9012

hdr_gets.max = v_gets;

9013

}

9014

9015

/* compute per-chain averages */

9016

ch_gets.avg = ch_gets.sum / ((double)head->len);

9017

hdr_loads.avg = hdr_loads.sum / ((double)head->len);

9018

hdr_gets.avg = hdr_gets.sum / ((double)head->len);

9019

9020

/* dump per-chain stats */

9021

Log("Volume hash chain %d : len=%d, looks=%s, reorders=%s\n",

9022

i, head->len,

9023

DoubleToPrintable(ch_looks.sum, pr_buf[0], sizeof(pr_buf[0])),

9024

DoubleToPrintable(ch_reorders.sum, pr_buf[1], sizeof(pr_buf[1])));

9025

Log("\tVolume gets : min=%s, max=%s, avg=%s, total=%s\n",

9026

DoubleToPrintable(ch_gets.min, pr_buf[0], sizeof(pr_buf[0])),

9027

DoubleToPrintable(ch_gets.max, pr_buf[1], sizeof(pr_buf[1])),

9028

DoubleToPrintable(ch_gets.avg, pr_buf[2], sizeof(pr_buf[2])),

9029

DoubleToPrintable(ch_gets.sum, pr_buf[3], sizeof(pr_buf[3])));

9030

Log("\tHDR gets : min=%s, max=%s, avg=%s, total=%s\n",

9031

DoubleToPrintable(hdr_gets.min, pr_buf[0], sizeof(pr_buf[0])),

9032

DoubleToPrintable(hdr_gets.max, pr_buf[1], sizeof(pr_buf[1])),

9033

DoubleToPrintable(hdr_gets.avg, pr_buf[2], sizeof(pr_buf[2])),

9034

DoubleToPrintable(hdr_gets.sum, pr_buf[3], sizeof(pr_buf[3])));

9035

Log("\tHDR loads : min=%s, max=%s, avg=%s, total=%s\n",

9036

DoubleToPrintable(hdr_loads.min, pr_buf[0], sizeof(pr_buf[0])),

9037

DoubleToPrintable(hdr_loads.max, pr_buf[1], sizeof(pr_buf[1])),

9038

DoubleToPrintable(hdr_loads.avg, pr_buf[2], sizeof(pr_buf[2])),

9039

DoubleToPrintable(hdr_loads.sum, pr_buf[3], sizeof(pr_buf[3])));

9040

} else if (flags & VOL_STATS_PER_CHAIN0x1) {

9041

/* dump simple per-chain stats */

9042

Log("Volume hash chain %d : len=%d, looks=%s, gets=%s, reorders=%s\n",

9043

i, head->len,

9044

DoubleToPrintable(ch_looks.sum, pr_buf[0], sizeof(pr_buf[0])),

9045

DoubleToPrintable(ch_gets.sum, pr_buf[1], sizeof(pr_buf[1])),

9046

DoubleToPrintable(ch_reorders.sum, pr_buf[2], sizeof(pr_buf[2])));

9047

}

9048

9049

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 9049), 0));

9050

VHashEndExclusive_r(head);

9051

}

9052

9053

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 9053), 0));

9054

9055

/* compute global averages */

9056

len.avg = len.sum / ((double)VolumeHashTable.Size);

9057

looks.avg = looks.sum / ((double)VolumeHashTable.Size);

9058

gets.avg = gets.sum / ((double)VolumeHashTable.Size);

9059

reorders.avg = reorders.sum / ((double)VolumeHashTable.Size);

9060

9061

/* dump global stats */

9062

Log("Volume hash summary: %d buckets\n", VolumeHashTable.Size);

9063

Log(" chain length : min=%s, max=%s, avg=%s, total=%s\n",

9064

DoubleToPrintable(len.min, pr_buf[0], sizeof(pr_buf[0])),

9065

DoubleToPrintable(len.max, pr_buf[1], sizeof(pr_buf[1])),

9066

DoubleToPrintable(len.avg, pr_buf[2], sizeof(pr_buf[2])),

9067

DoubleToPrintable(len.sum, pr_buf[3], sizeof(pr_buf[3])));

9068

Log(" looks : min=%s, max=%s, avg=%s, total=%s\n",

9069

DoubleToPrintable(looks.min, pr_buf[0], sizeof(pr_buf[0])),

9070

DoubleToPrintable(looks.max, pr_buf[1], sizeof(pr_buf[1])),

9071

DoubleToPrintable(looks.avg, pr_buf[2], sizeof(pr_buf[2])),

9072

DoubleToPrintable(looks.sum, pr_buf[3], sizeof(pr_buf[3])));

9073

Log(" gets : min=%s, max=%s, avg=%s, total=%s\n",

9074

DoubleToPrintable(gets.min, pr_buf[0], sizeof(pr_buf[0])),

9075

DoubleToPrintable(gets.max, pr_buf[1], sizeof(pr_buf[1])),

9076

DoubleToPrintable(gets.avg, pr_buf[2], sizeof(pr_buf[2])),

9077

DoubleToPrintable(gets.sum, pr_buf[3], sizeof(pr_buf[3])));

9078

Log(" reorders : min=%s, max=%s, avg=%s, total=%s\n",

9079

DoubleToPrintable(reorders.min, pr_buf[0], sizeof(pr_buf[0])),

9080

DoubleToPrintable(reorders.max, pr_buf[1], sizeof(pr_buf[1])),

9081

DoubleToPrintable(reorders.avg, pr_buf[2], sizeof(pr_buf[2])),

9082

DoubleToPrintable(reorders.sum, pr_buf[3], sizeof(pr_buf[3])));

9083

9084

/* print extended disk related statistics */

9085

{

9086

struct DiskPartition64 * diskP;

9087

afs_uint32 vol_count[VOLMAXPARTS255+1];

9088

byte part_exists[VOLMAXPARTS255+1];

9089

Device id;

9090

int i;

9091

9092

memset(vol_count, 0, sizeof(vol_count));

9093

memset(part_exists, 0, sizeof(part_exists));

9094

9095

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 9095), 0));

9096

9097

for (diskP = DiskPartitionList; diskP; diskP = diskP->next) {

9098

id = diskP->index;

9099

vol_count[id] = diskP->vol_list.len;

9100

part_exists[id] = 1;

9101

}

9102

9103

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 9103), 0));

9104

for (i = 0; i <= VOLMAXPARTS255; i++) {

9105

if (part_exists[i]) {

9106

/* XXX while this is currently safe, it is a violation

9107

* of the VGetPartitionById_r interface contract. */

9108

diskP = VGetPartitionById_r(i, 0);

9109

if (diskP) {

9110

Log("Partition %s has %d online volumes\n",

9111

VPartitionPath(diskP), diskP->vol_list.len);

9112

}

9113

}

9114

}

9115

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 9115), 0));

9116

}

9117

9118

/* print extended VLRU statistics */

9119

if (VVLRUExtStats_r(&vlru_stats, vol_sum) == 0) {

9120

afs_uint32 idx, cur, lpos;

9121

VolumeId line[5];

9122

9123

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 9123), 0));

9124

9125

Log("VLRU State Dump:\n\n");

9126

9127

for (idx = VLRU_QUEUE_NEW; idx < VLRU_QUEUE_INVALID; idx++) {

9128

Log("\t%s:\n", vlru_idx_to_string(idx));

9129

9130

lpos = 0;

9131

for (cur = vlru_stats.queue_info[idx].start;

9132

cur < vlru_stats.queue_info[idx].len;

9133

cur++) {

9134

line[lpos++] = vlru_stats.vec[cur].volid;

9135

if (lpos==5) {

9136

Log("\t\t%u, %u, %u, %u, %u,\n",

9137

line[0], line[1], line[2], line[3], line[4]);

9138

lpos = 0;

9139

}

9140

}

9141

9142

if (lpos) {

9143

while (lpos < 5) {

9144

line[lpos++] = 0;

9145

}

9146

Log("\t\t%u, %u, %u, %u, %u\n",

9147

line[0], line[1], line[2], line[3], line[4]);

9148

}

9149

Log("\n");

9150

}

9151

9152

free(vlru_stats.vec);

9153

9154

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 9154), 0));

9155

}

9156

}

9157

9158

void

9159

VPrintExtendedCacheStats(int flags)

9160

{

9161

VOL_LOCK(void)((pthread_mutex_lock(&vol_glock_mutex) == 0) || (osi_AssertFailU
("pthread_mutex_lock(&vol_glock_mutex) == 0", "./../vol/volume.c"
, 9161), 0));

9162

VPrintExtendedCacheStats_r(flags);

9163

VOL_UNLOCK(void)((pthread_mutex_unlock(&vol_glock_mutex) == 0) || (
osi_AssertFailU("pthread_mutex_unlock(&vol_glock_mutex) == 0"
, "./../vol/volume.c", 9163), 0));

9164

}

9165

#endif /* AFS_DEMAND_ATTACH_FS */

9166

9167

afs_int32

9168

VCanScheduleSalvage(void)

9169

{

9170

return vol_opts.canScheduleSalvage;

9171

}

9172

9173

afs_int32

9174

VCanUseFSSYNC(void)

9175

{

9176

return vol_opts.canUseFSSYNC;

9177

}

9178

9179

afs_int32

9180

VCanUseSALVSYNC(void)

9181

{

9182

return vol_opts.canUseSALVSYNC;

9183

}

9184

9185

afs_int32

9186

VCanUnsafeAttach(void)

9187

{

9188

return vol_opts.unsafe_attach;

9189

}