Bug Summary

File:afs/afs_daemons.c
Location:line 146, column 5
Description:Value stored to 'last1MinCheck' is never read

Annotated Source Code

1/*
2 * Copyright 2000, International Business Machines Corporation and others.
3 * All Rights Reserved.
4 *
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
8 */
9
10#include <afsconfig.h>
11#include "afs/param.h"
12
13
14#ifdef AFS_AIX51_ENV
15#define __FULL_PROTO
16#include <sys/sleep.h>
17#endif
18
19#include "afs/sysincludes.h" /* Standard vendor system headers */
20#include "afsincludes.h" /* Afs-based standard headers */
21#include "afs/afs_stats.h" /* statistics gathering code */
22#include "afs/afs_cbqueue.h"
23#ifdef AFS_AIX_ENV
24#include <sys/adspace.h> /* for vm_att(), vm_det() */
25#endif
26
27#if defined(AFS_CACHE_BYPASS)
28#include "afs/afs_bypasscache.h"
29#endif// defined(AFS_CACHE_BYPASS)
30/* background request queue size */
31afs_lock_t afs_xbrs; /* lock for brs */
32static int brsInit = 0;
33short afs_brsWaiters = 0; /* number of users waiting for brs buffers */
34short afs_brsDaemons = 0; /* number of daemons waiting for brs requests */
35struct brequest afs_brs[NBRS15]; /* request structures */
36struct afs_osi_WaitHandle AFS_WaitHandler, AFS_CSWaitHandler;
37static int afs_brs_count = 0; /* request counter, to service reqs in order */
38
39static int rxepoch_checked = 0;
40#define afs_CheckRXEpoch(){if (rxepoch_checked == 0 && rxkad_EpochWasSet) { rxepoch_checked
= 1; afs_GCUserData( 1); } } {if (rxepoch_checked == 0 && rxkad_EpochWasSet) { \
41 rxepoch_checked = 1; afs_GCUserData(/* force flag */ 1); } }
42
43/* PAG garbage collection */
44/* We induce a compile error if param.h does not define AFS_GCPAGS */
45afs_int32 afs_gcpags = AFS_GCPAGS0;
46afs_int32 afs_gcpags_procsize = 0;
47
48afs_int32 afs_CheckServerDaemonStarted = 0;
49#ifndef DEFAULT_PROBE_INTERVAL30
50#define DEFAULT_PROBE_INTERVAL30 30 /* default to 3 min */
51#endif
52afs_int32 afs_probe_interval = DEFAULT_PROBE_INTERVAL30;
53afs_int32 afs_probe_all_interval = 600;
54afs_int32 afs_nat_probe_interval = 60;
55afs_int32 afs_preCache = 0;
56
57#define PROBE_WAIT()(1000 * (afs_probe_interval - ((afs_random() & 0x7fffffff
) % (afs_probe_interval/2)))) (1000 * (afs_probe_interval - ((afs_random() & 0x7fffffff) \
58 % (afs_probe_interval/2))))
59
60void
61afs_SetCheckServerNATmode(int isnat)
62{
63 static afs_int32 old_intvl, old_all_intvl;
64 static int wasnat;
65
66 if (isnat && !wasnat) {
67 old_intvl = afs_probe_interval;
68 old_all_intvl = afs_probe_all_interval;
69 afs_probe_interval = afs_nat_probe_interval;
70 afs_probe_all_interval = afs_nat_probe_interval;
71 afs_osi_CancelWait(&AFS_CSWaitHandler);
72 } else if (!isnat && wasnat) {
73 afs_probe_interval = old_intvl;
74 afs_probe_all_interval = old_all_intvl;
75 }
76 wasnat = isnat;
77}
78
79void
80afs_CheckServerDaemon(void)
81{
82 afs_int32 now, delay, lastCheck, last10MinCheck;
83
84 afs_CheckServerDaemonStarted = 1;
85
86 while (afs_initState < 101)
87 afs_osi_Sleep(&afs_initState);
88 afs_osi_Wait(PROBE_WAIT()(1000 * (afs_probe_interval - ((afs_random() & 0x7fffffff
) % (afs_probe_interval/2)))), &AFS_CSWaitHandler, 0);
89
90 last10MinCheck = lastCheck = osi_Time()time_second;
91 while (1) {
92 if (afs_termState == AFSOP_STOP_CS216) {
93 afs_termState = AFSOP_STOP_BKG212;
94 afs_osi_Wakeup(&afs_termState);
95 break;
96 }
97
98 now = osi_Time()time_second;
99 if (afs_probe_interval + lastCheck <= now) {
100 afs_CheckServers(1, NULL((void *)0)); /* check down servers */
101 lastCheck = now = osi_Time()time_second;
102 }
103
104 if (afs_probe_all_interval + last10MinCheck <= now) {
105 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, afs_probe_all_interval)(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event1(afs_iclSetp, (701087797L), (1<<24)+((7)
<<18), (long)(afs_probe_all_interval)) : 0);
106 afs_CheckServers(0, NULL((void *)0));
107 last10MinCheck = now = osi_Time()time_second;
108 }
109 /* shutdown check. */
110 if (afs_termState == AFSOP_STOP_CS216) {
111 afs_termState = AFSOP_STOP_BKG212;
112 afs_osi_Wakeup(&afs_termState);
113 break;
114 }
115
116 /* Compute time to next probe. */
117 delay = afs_probe_interval + lastCheck;
118 if (delay > afs_probe_all_interval + last10MinCheck)
119 delay = afs_probe_all_interval + last10MinCheck;
120 delay -= now;
121 if (delay < 1)
122 delay = 1;
123 afs_osi_Wait(delay * 1000, &AFS_CSWaitHandler, 0);
124 }
125 afs_CheckServerDaemonStarted = 0;
126}
127
128extern int vfs_context_ref;
129
130/* This function always holds the GLOCK whilst it is running. The caller
131 * gets the GLOCK before invoking it, and afs_osi_Sleep drops the GLOCK
132 * whilst we are sleeping, and regains it when we're woken up.
133 */
134void
135afs_Daemon(void)
136{
137 afs_int32 code;
138 struct afs_exporter *exporter;
139 afs_int32 now;
140 afs_int32 last3MinCheck, last10MinCheck, last60MinCheck, lastNMinCheck;
141 afs_int32 last1MinCheck, last5MinCheck;
142 afs_uint32 lastCBSlotBump;
143 char cs_warned = 0;
144
145 AFS_STATCNT(afs_Daemon)((afs_cmstats.callInfo.C_afs_Daemon)++);
146 last1MinCheck = last3MinCheck = last60MinCheck = last10MinCheck =
Value stored to 'last1MinCheck' is never read
147 last5MinCheck = lastNMinCheck = 0;
148
149 afs_rootFid.Fid.Volume = 0;
150 while (afs_initState < 101)
151 afs_osi_Sleep(&afs_initState);
152
153#ifdef AFS_DARWIN80_ENV
154 if (afs_osi_ctxtp_initialized)
155 osi_Panic("vfs context already initialized");
156 while (afs_osi_ctxtp && vfs_context_ref)
157 afs_osi_Sleep(&afs_osi_ctxtp);
158 if (afs_osi_ctxtp && !vfs_context_ref)
159 vfs_context_rele(afs_osi_ctxtp);
160 afs_osi_ctxtp = vfs_context_create(NULL((void *)0));
161 afs_osi_ctxtp_initialized = 1;
162#endif
163 now = osi_Time()time_second;
164 lastCBSlotBump = now;
165
166 /* when a lot of clients are booted simultaneously, they develop
167 * annoying synchronous VL server bashing behaviors. So we stagger them.
168 */
169 last1MinCheck = now + ((afs_random() & 0x7fffffff) % 60); /* an extra 30 */
170 last3MinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
171 last60MinCheck = now - 1800 + ((afs_random() & 0x7fffffff) % 3600);
172 last10MinCheck = now - 300 + ((afs_random() & 0x7fffffff) % 600);
173 last5MinCheck = now - 150 + ((afs_random() & 0x7fffffff) % 300);
174 lastNMinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
175
176 /* start off with afs_initState >= 101 (basic init done) */
177 while (1) {
178 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
179
180 /* things to do every 20 seconds or less - required by protocol spec */
181 if (afs_nfsexporter)
182 afs_FlushActiveVcaches(0); /* flush NFS writes */
183 afs_FlushVCBs(1); /* flush queued callbacks */
184
185 afs_MaybeWakeupTruncateDaemon(); /* free cache space if have too */
186 rx_CheckPackets(); /* Does RX need more packets? */
187
188 now = osi_Time()time_second;
189 if (lastCBSlotBump + CBHTSLOTLEN128 < now) { /* pretty time-dependant */
190 lastCBSlotBump = now;
191 if (afs_BumpBase()) {
192 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
193 }
194 }
195
196 if (last1MinCheck + 60 < now) {
197 /* things to do every minute */
198 DFlush(); /* write out dir buffers */
199 afs_WriteThroughDSlots(); /* write through cacheinfo entries */
200 ObtainWriteLock(&afs_xvcache, 736)do { ; if (!(&afs_xvcache)->excl_locked && !(&
afs_xvcache)->readers_reading) (&afs_xvcache) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xvcache, 2); (&afs_xvcache
)->pid_writer = (((__curthread())->td_proc)->p_pid )
; (&afs_xvcache)->src_indicator = 736; } while (0);
201 afs_FlushReclaimedVcaches();
202 ReleaseWriteLock(&afs_xvcache)do { ; (&afs_xvcache)->excl_locked &= ~2; if ((&
afs_xvcache)->wait_states) Afs_Lock_ReleaseR(&afs_xvcache
); (&afs_xvcache)->pid_writer=0; } while (0);
203 afs_FlushActiveVcaches(1); /* keep flocks held & flush nfs writes */
204#if 0
205 afs_StoreDirtyVcaches();
206#endif
207 afs_CheckRXEpoch(){if (rxepoch_checked == 0 && rxkad_EpochWasSet) { rxepoch_checked
= 1; afs_GCUserData( 1); } };
208 last1MinCheck = now;
209 }
210
211 if (last3MinCheck + 180 < now) {
212 afs_CheckTokenCache(); /* check for access cache resets due to expired
213 * tickets */
214 last3MinCheck = now;
215 }
216
217 if (afsd_dynamic_vcaches0 && (last5MinCheck + 300 < now)) {
218 /* start with trying to drop us back to our base usage */
219 int anumber = VCACHE_FREE5 + (afs_vcount - afs_cacheStats);
220
221 if (anumber > 0) {
222 ObtainWriteLock(&afs_xvcache, 734)do { ; if (!(&afs_xvcache)->excl_locked && !(&
afs_xvcache)->readers_reading) (&afs_xvcache) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xvcache, 2); (&afs_xvcache
)->pid_writer = (((__curthread())->td_proc)->p_pid )
; (&afs_xvcache)->src_indicator = 734; } while (0);
223 afs_ShakeLooseVCaches(anumber);
224 ReleaseWriteLock(&afs_xvcache)do { ; (&afs_xvcache)->excl_locked &= ~2; if ((&
afs_xvcache)->wait_states) Afs_Lock_ReleaseR(&afs_xvcache
); (&afs_xvcache)->pid_writer=0; } while (0);
225 }
226 last5MinCheck = now;
227 }
228
229 if (!afs_CheckServerDaemonStarted) {
230 /* Do the check here if the correct afsd is not installed. */
231 if (!cs_warned) {
232 cs_warned = 1;
233 afs_warn("Please install afsd with check server daemon.\n");
234 }
235 if (lastNMinCheck + afs_probe_interval < now) {
236 /* only check down servers */
237 afs_CheckServers(1, NULL((void *)0));
238 lastNMinCheck = now;
239 }
240 }
241 if (last10MinCheck + 600 < now) {
242#ifdef AFS_USERSPACE_IP_ADDR
243 extern int rxi_GetcbiInfo(void);
244#endif
245 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, 600)(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event1(afs_iclSetp, (701087797L), (1<<24)+((7)
<<18), (long)(600)) : 0);
246#ifdef AFS_USERSPACE_IP_ADDR
247 if (rxi_GetcbiInfo()) { /* addresses changed from last time */
248 afs_FlushCBs();
249 }
250#else /* AFS_USERSPACE_IP_ADDR */
251 if (rxi_GetIFInfo()) { /* addresses changed from last time */
252 afs_FlushCBs();
253 }
254#endif /* else AFS_USERSPACE_IP_ADDR */
255 if (!afs_CheckServerDaemonStarted)
256 afs_CheckServers(0, NULL((void *)0));
257 afs_GCUserData(0); /* gc old conns */
258 /* This is probably the wrong way of doing GC for the various exporters but it will suffice for a while */
259 for (exporter = root_exported; exporter;
260 exporter = exporter->exp_next) {
261 (void)EXP_GC(exporter, 0)(*(exporter)->exp_op->export_garbagecollect)(exporter, 0
); /* Generalize params */
262 }
263 {
264 static int cnt = 0;
265 if (++cnt < 12) {
266 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED0x1 |
267 AFS_VOLCHECK_BUSY0x2);
268 } else {
269 cnt = 0;
270 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED0x1 |
271 AFS_VOLCHECK_BUSY0x2 |
272 AFS_VOLCHECK_MTPTS0x4);
273 }
274 }
275 last10MinCheck = now;
276 }
277 if (last60MinCheck + 3600 < now) {
278 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEVOLUME, ICL_TYPE_INT32,(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event1(afs_iclSetp, (701087798L), (1<<24)+((7)
<<18), (long)(3600)) : 0)
279 3600)(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event1(afs_iclSetp, (701087798L), (1<<24)+((7)
<<18), (long)(3600)) : 0);
280 afs_CheckRootVolume();
281#if AFS_GCPAGS0
282 if (afs_gcpags == AFS_GCPAGS_OK) {
283 afs_int32 didany;
284 afs_GCPAGs(&didany);
285 }
286#endif
287 last60MinCheck = now;
288 }
289 if (afs_initState < 300) { /* while things ain't rosy */
290 code = afs_CheckRootVolume();
291 if (code == 0)
292 afs_initState = 300; /* succeeded */
293 if (afs_initState < 200)
294 afs_initState = 200; /* tried once */
295 afs_osi_Wakeup(&afs_initState);
296 }
297
298 /* 18285 is because we're trying to divide evenly into 128, that is,
299 * CBSlotLen, while staying just under 20 seconds. If CBSlotLen
300 * changes, should probably change this interval, too.
301 * Some of the preceding actions may take quite some time, so we
302 * might not want to wait the entire interval */
303 now = 18285 - (osi_Time()time_second - now);
304 if (now > 0) {
305 afs_osi_Wait(now, &AFS_WaitHandler, 0);
306 }
307
308 if (afs_termState == AFSOP_STOP_AFS211) {
309 if (afs_CheckServerDaemonStarted)
310 afs_termState = AFSOP_STOP_CS216;
311 else
312 afs_termState = AFSOP_STOP_BKG212;
313 afs_osi_Wakeup(&afs_termState);
314 return;
315 }
316 }
317}
318
319int
320afs_CheckRootVolume(void)
321{
322 char rootVolName[32];
323 struct volume *tvp = NULL((void *)0);
324 int usingDynroot = afs_GetDynrootEnable();
325 int localcell;
326
327 AFS_STATCNT(afs_CheckRootVolume)((afs_cmstats.callInfo.C_afs_CheckRootVolume)++);
328 if (*afs_rootVolumeName == 0) {
329 strcpy(rootVolName, "root.afs");
330 } else {
331 strcpy(rootVolName, afs_rootVolumeName);
332 }
333
334 if (usingDynroot) {
335 afs_GetDynrootFid(&afs_rootFid);
336 tvp = afs_GetVolume(&afs_rootFid, NULL((void *)0), READ_LOCK1);
337 } else {
338 struct cell *lc = afs_GetPrimaryCell(READ_LOCK1);
339
340 if (!lc)
341 return ENOENT2;
342 localcell = lc->cellNum;
343 afs_PutCell(lc, READ_LOCK);
344 tvp = afs_GetVolumeByName(rootVolName, localcell, 1, NULL((void *)0), READ_LOCK1);
345 if (!tvp) {
346 char buf[128];
347 int len = strlen(rootVolName);
348
349 if ((len < 9) || strcmp(&rootVolName[len - 9], ".readonly")) {
350 strcpy(buf, rootVolName);
351 afs_strcat(buf, ".readonly")strcat((buf), (".readonly"));
352 tvp = afs_GetVolumeByName(buf, localcell, 1, NULL((void *)0), READ_LOCK1);
353 }
354 }
355 if (tvp) {
356 int volid = (tvp->roVol ? tvp->roVol : tvp->volume);
357 afs_rootFid.Cell = localcell;
358 if (afs_rootFid.Fid.Volume && afs_rootFid.Fid.Volume != volid
359 && afs_globalVp) {
360 /* If we had a root fid before and it changed location we reset
361 * the afs_globalVp so that it will be reevaluated.
362 * Just decrement the reference count. This only occurs during
363 * initial cell setup and can panic the machine if we set the
364 * count to zero and fs checkv is executed when the current
365 * directory is /afs.
366 */
367#ifdef AFS_LINUX20_ENV
368 {
369 struct vrequest treq;
370 struct vattr vattr;
371 cred_t *credp;
372 struct dentry *dp;
373 struct vcache *vcp;
374
375 afs_rootFid.Fid.Volume = volid;
376 afs_rootFid.Fid.Vnode = 1;
377 afs_rootFid.Fid.Unique = 1;
378
379 credp = crref();
380 if (afs_InitReq(&treq, credp))
381 goto out;
382 vcp = afs_GetVCache(&afs_rootFid, &treq, NULL((void *)0), NULL((void *)0));
383 if (!vcp)
384 goto out;
385 afs_getattr(vcp, &vattr, credp);
386 afs_fill_inode(AFSTOV(vcp)((vcp)->v), &vattr);
387
388 dp = d_find_alias(AFSTOV(afs_globalVp)((afs_globalVp)->v));
389
390#if defined(AFS_LINUX24_ENV)
391#if defined(HAVE_DCACHE_LOCK)
392 spin_lock(&dcache_lock);
393#else
394 spin_lock(&AFSTOV(vcp)((vcp)->v)->i_lock);
395#endif
396#if defined(AFS_LINUX26_ENV)
397 spin_lock(&dp->d_lock);
398#endif
399#endif
400 list_del_init(&dp->d_alias);
401 list_add(&dp->d_alias, &(AFSTOV(vcp)((vcp)->v)->i_dentry));
402 dp->d_inode = AFSTOV(vcp)((vcp)->v);
403#if defined(AFS_LINUX24_ENV)
404#if defined(AFS_LINUX26_ENV)
405 spin_unlock(&dp->d_lock);
406#endif
407#if defined(HAVE_DCACHE_LOCK)
408 spin_unlock(&dcache_lock);
409#else
410 spin_unlock(&AFSTOV(vcp)((vcp)->v)->i_lock);
411#endif
412#endif
413 dput(dp);
414
415 AFS_FAST_RELE(afs_globalVp)do { do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)),
(0), "/home/wollman/openafs/src/afs/afs_daemons.c", 415); } while
(0); do { vrele(((afs_globalVp)->v)); } while(0);; do { (
void)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 415); (void)0; } while (0); } while (0);
416 afs_globalVp = vcp;
417 out:
418 crfree(credp);
419 }
420#else
421#ifdef AFS_DARWIN80_ENV
422 afs_PutVCache(afs_globalVp);
423#else
424 AFS_FAST_RELE(afs_globalVp)do { do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)),
(0), "/home/wollman/openafs/src/afs/afs_daemons.c", 424); } while
(0); do { vrele(((afs_globalVp)->v)); } while(0);; do { (
void)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 424); (void)0; } while (0); } while (0);
425#endif
426 afs_globalVp = 0;
427#endif
428 }
429 afs_rootFid.Fid.Volume = volid;
430 afs_rootFid.Fid.Vnode = 1;
431 afs_rootFid.Fid.Unique = 1;
432 }
433 }
434 if (tvp) {
435 afs_initState = 300; /* won */
436 afs_osi_Wakeup(&afs_initState);
437 afs_PutVolume(tvp, READ_LOCK)((tvp)->refCount--);
438 }
439 if (afs_rootFid.Fid.Volume)
440 return 0;
441 else
442 return ENOENT2;
443}
444
445/* ptr_parm 0 is the pathname, size_parm 0 to the fetch is the chunk number */
446static void
447BPath(struct brequest *ab)
448{
449 struct dcache *tdc = NULL((void *)0);
450 struct vcache *tvc = NULL((void *)0);
451 struct vnode *tvn = NULL((void *)0);
452#ifdef AFS_LINUX22_ENV
453 struct dentry *dp = NULL((void *)0);
454#endif
455 afs_size_t offset, len;
456 struct vrequest treq;
457 afs_int32 code;
458
459 AFS_STATCNT(BPath)((afs_cmstats.callInfo.C_BPath)++);
460 if ((code = afs_InitReq(&treq, ab->cred)))
461 return;
462 AFS_GUNLOCK()do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)), (0),
"/home/wollman/openafs/src/afs/afs_daemons.c", 462); } while
(0);
463#ifdef AFS_LINUX22_ENV
464 code = gop_lookupnameosi_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYSUIO_SYSSPACE, 1, &dp);
465 if (dp)
466 tvn = (struct vnode *)dp->d_inode;
467#else
468 code = gop_lookupnameosi_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYSUIO_SYSSPACE, 1, &tvn);
469#endif
470 AFS_GLOCK()do { (void)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 470); (void)0; } while (0);
471 osi_FreeLargeSpace((char *)ab->ptr_parm[0]); /* free path name buffer here */
472 if (code)
473 return;
474 /* now path may not have been in afs, so check that before calling our cache manager */
475 if (!tvn || !IsAfsVnode(tvn)((tvn)->v_op == &afs_vnodeops)) {
476 /* release it and give up */
477 if (tvn) {
478#ifdef AFS_LINUX22_ENV
479 dput(dp);
480#else
481 AFS_RELE(tvn)do { do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)),
(0), "/home/wollman/openafs/src/afs/afs_daemons.c", 481); } while
(0); do { vrele(tvn); } while(0);; do { (void)0; _mtx_lock_flags
(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 481); (void)0; } while (0); } while (0);
482#endif
483 }
484 return;
485 }
486 tvc = VTOAFS(tvn)((struct vcache *)(tvn)->v_data);
487 /* here we know its an afs vnode, so we can get the data for the chunk */
488 tdc = afs_GetDCache(tvc, ab->size_parm[0], &treq, &offset, &len, 1);
489 if (tdc) {
490 afs_PutDCache(tdc);
491 }
492#ifdef AFS_LINUX22_ENV
493 dput(dp);
494#else
495 AFS_RELE(tvn)do { do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)),
(0), "/home/wollman/openafs/src/afs/afs_daemons.c", 495); } while
(0); do { vrele(tvn); } while(0);; do { (void)0; _mtx_lock_flags
(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 495); (void)0; } while (0); } while (0);
496#endif
497}
498
499/* size_parm 0 to the fetch is the chunk number,
500 * ptr_parm 0 is the dcache entry to wakeup,
501 * size_parm 1 is true iff we should release the dcache entry here.
502 */
503static void
504BPrefetch(struct brequest *ab)
505{
506 struct dcache *tdc;
507 struct vcache *tvc;
508 afs_size_t offset, len, abyte, totallen = 0;
509 struct vrequest treq;
510
511 AFS_STATCNT(BPrefetch)((afs_cmstats.callInfo.C_BPrefetch)++);
512 if ((len = afs_InitReq(&treq, ab->cred)))
513 return;
514 abyte = ab->size_parm[0];
515 tvc = ab->vc;
516 do {
517 tdc = afs_GetDCache(tvc, abyte, &treq, &offset, &len, 1);
518 if (tdc) {
519 afs_PutDCache(tdc);
520 }
521 abyte+=len;
522 totallen += len;
523 } while ((totallen < afs_preCache) && tdc && (len > 0));
524 /* now, dude may be waiting for us to clear DFFetchReq bit; do so. Can't
525 * use tdc from GetDCache since afs_GetDCache may fail, but someone may
526 * be waiting for our wakeup anyway.
527 */
528 tdc = (struct dcache *)(ab->ptr_parm[0]);
529 ObtainSharedLock(&tdc->lock, 640)do { ; if (!(&tdc->lock)->excl_locked) (&tdc->
lock) -> excl_locked = 4; else Afs_Lock_Obtain(&tdc->
lock, 4); (&tdc->lock)->pid_writer = (((__curthread
())->td_proc)->p_pid ); (&tdc->lock)->src_indicator
= 640; } while (0);
530 if (tdc->mflags & DFFetchReq0x10) {
531 UpgradeSToWLock(&tdc->lock, 641)do { ; if (!(&tdc->lock)->readers_reading) (&tdc
->lock)->excl_locked = 2; else Afs_Lock_Obtain(&tdc
->lock, 6); (&tdc->lock)->pid_writer = (((__curthread
())->td_proc)->p_pid ); (&tdc->lock)->src_indicator
= 641; } while (0);
532 tdc->mflags &= ~DFFetchReq0x10;
533 ReleaseWriteLock(&tdc->lock)do { ; (&tdc->lock)->excl_locked &= ~2; if ((&
tdc->lock)->wait_states) Afs_Lock_ReleaseR(&tdc->
lock); (&tdc->lock)->pid_writer=0; } while (0);
534 } else {
535 ReleaseSharedLock(&tdc->lock)do { ; (&tdc->lock)->excl_locked &= ~(4 | 2); if
((&tdc->lock)->wait_states) Afs_Lock_ReleaseR(&
tdc->lock); (&tdc->lock)->pid_writer=0; } while (
0);
536 }
537 afs_osi_Wakeup(&tdc->validPos);
538 if (ab->size_parm[1]) {
539 afs_PutDCache(tdc); /* put this one back, too */
540 }
541}
542
543#if defined(AFS_CACHE_BYPASS)
544static void
545BPrefetchNoCache(struct brequest *ab)
546{
547 struct vrequest treq;
548 afs_size_t len;
549
550 if ((len = afs_InitReq(&treq, ab->cred)))
551 return;
552
553#ifndef UKERNEL
554 /* OS-specific prefetch routine */
555 afs_PrefetchNoCache(ab->vc, ab->cred, (struct nocache_read_request *) ab->ptr_parm[0]);
556#endif
557}
558#endif
559
560static void
561BStore(struct brequest *ab)
562{
563 struct vcache *tvc;
564 afs_int32 code;
565 struct vrequest treq;
566#if defined(AFS_SGI_ENV)
567 struct cred *tmpcred;
568#endif
569
570 AFS_STATCNT(BStore)((afs_cmstats.callInfo.C_BStore)++);
571 if ((code = afs_InitReq(&treq, ab->cred)))
572 return;
573 code = 0;
574 tvc = ab->vc;
575#if defined(AFS_SGI_ENV)
576 /*
577 * Since StoreOnLastReference can end up calling osi_SyncVM which
578 * calls into VM code that assumes that u.u_cred has the
579 * correct credentials, we set our to theirs for this xaction
580 */
581 tmpcred = OSI_GET_CURRENT_CRED();
582 OSI_SET_CURRENT_CRED(ab->cred);
583
584 /*
585 * To avoid recursion since the WriteLock may be released during VM
586 * operations, we hold the VOP_RWLOCK across this transaction as
587 * do the other callers of StoreOnLastReference
588 */
589 AFS_RWLOCK((vnode_tstruct vnode *) tvc, 1);
590#endif
591 ObtainWriteLock(&tvc->lock, 209)do { ; if (!(&tvc->lock)->excl_locked && !(
&tvc->lock)->readers_reading) (&tvc->lock) ->
excl_locked = 2; else Afs_Lock_Obtain(&tvc->lock, 2);
(&tvc->lock)->pid_writer = (((__curthread())->td_proc
)->p_pid ); (&tvc->lock)->src_indicator = 209; }
while (0);
592 code = afs_StoreOnLastReference(tvc, &treq);
593 ReleaseWriteLock(&tvc->lock)do { ; (&tvc->lock)->excl_locked &= ~2; if ((&
tvc->lock)->wait_states) Afs_Lock_ReleaseR(&tvc->
lock); (&tvc->lock)->pid_writer=0; } while (0);
594#if defined(AFS_SGI_ENV)
595 OSI_SET_CURRENT_CRED(tmpcred);
596 AFS_RWUNLOCK((vnode_tstruct vnode *) tvc, 1);
597#endif
598 /* now set final return code, and wakeup anyone waiting */
599 if ((ab->flags & BUVALID2) == 0) {
600 ab->code = afs_CheckCode(code, &treq, 43); /* set final code, since treq doesn't go across processes */
601 ab->flags |= BUVALID2;
602 if (ab->flags & BUWAIT4) {
603 ab->flags &= ~BUWAIT4;
604 afs_osi_Wakeup(ab);
605 }
606 }
607}
608
609/* release a held request buffer */
610void
611afs_BRelease(struct brequest *ab)
612{
613
614 AFS_STATCNT(afs_BRelease)((afs_cmstats.callInfo.C_afs_BRelease)++);
615 ObtainWriteLock(&afs_xbrs, 294)do { ; if (!(&afs_xbrs)->excl_locked && !(&
afs_xbrs)->readers_reading) (&afs_xbrs) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xbrs, 2); (&afs_xbrs)
->pid_writer = (((__curthread())->td_proc)->p_pid );
(&afs_xbrs)->src_indicator = 294; } while (0);
616 if (--ab->refCount <= 0) {
617 ab->flags = 0;
618 }
619 if (afs_brsWaiters)
620 afs_osi_Wakeup(&afs_brsWaiters);
621 ReleaseWriteLock(&afs_xbrs)do { ; (&afs_xbrs)->excl_locked &= ~2; if ((&afs_xbrs
)->wait_states) Afs_Lock_ReleaseR(&afs_xbrs); (&afs_xbrs
)->pid_writer=0; } while (0);
622}
623
624/* return true if bkg fetch daemons are all busy */
625int
626afs_BBusy(void)
627{
628 AFS_STATCNT(afs_BBusy)((afs_cmstats.callInfo.C_afs_BBusy)++);
629 if (afs_brsDaemons > 0)
630 return 0;
631 return 1;
632}
633
634struct brequest *
635afs_BQueue(short aopcode, struct vcache *avc,
636 afs_int32 dontwait, afs_int32 ause, afs_ucred_t *acred,
637 afs_size_t asparm0, afs_size_t asparm1, void *apparm0,
638 void *apparm1, void *apparm2)
639{
640 int i;
641 struct brequest *tb;
642
643 AFS_STATCNT(afs_BQueue)((afs_cmstats.callInfo.C_afs_BQueue)++);
644 ObtainWriteLock(&afs_xbrs, 296)do { ; if (!(&afs_xbrs)->excl_locked && !(&
afs_xbrs)->readers_reading) (&afs_xbrs) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xbrs, 2); (&afs_xbrs)
->pid_writer = (((__curthread())->td_proc)->p_pid );
(&afs_xbrs)->src_indicator = 296; } while (0);
645 while (1) {
646 tb = afs_brs;
647 for (i = 0; i < NBRS15; i++, tb++) {
648 if (tb->refCount == 0)
649 break;
650 }
651 if (i < NBRS15) {
652 /* found a buffer */
653 tb->opcode = aopcode;
654 tb->vc = avc;
655 tb->cred = acred;
656 crhold(tb->cred);
657 if (avc) {
658 AFS_FAST_HOLD(avc)vref((((avc))->v));
659 }
660 tb->refCount = ause + 1;
661 tb->size_parm[0] = asparm0;
662 tb->size_parm[1] = asparm1;
663 tb->ptr_parm[0] = apparm0;
664 tb->ptr_parm[1] = apparm1;
665 tb->ptr_parm[2] = apparm2;
666 tb->flags = 0;
667 tb->code = 0;
668 tb->ts = afs_brs_count++;
669 /* if daemons are waiting for work, wake them up */
670 if (afs_brsDaemons > 0) {
671 afs_osi_Wakeup(&afs_brsDaemons);
672 }
673 ReleaseWriteLock(&afs_xbrs)do { ; (&afs_xbrs)->excl_locked &= ~2; if ((&afs_xbrs
)->wait_states) Afs_Lock_ReleaseR(&afs_xbrs); (&afs_xbrs
)->pid_writer=0; } while (0);
674 return tb;
675 }
676 if (dontwait) {
677 ReleaseWriteLock(&afs_xbrs)do { ; (&afs_xbrs)->excl_locked &= ~2; if ((&afs_xbrs
)->wait_states) Afs_Lock_ReleaseR(&afs_xbrs); (&afs_xbrs
)->pid_writer=0; } while (0);
678 return NULL((void *)0);
679 }
680 /* no free buffers, sleep a while */
681 afs_brsWaiters++;
682 ReleaseWriteLock(&afs_xbrs)do { ; (&afs_xbrs)->excl_locked &= ~2; if ((&afs_xbrs
)->wait_states) Afs_Lock_ReleaseR(&afs_xbrs); (&afs_xbrs
)->pid_writer=0; } while (0);
683 afs_osi_Sleep(&afs_brsWaiters);
684 ObtainWriteLock(&afs_xbrs, 301)do { ; if (!(&afs_xbrs)->excl_locked && !(&
afs_xbrs)->readers_reading) (&afs_xbrs) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xbrs, 2); (&afs_xbrs)
->pid_writer = (((__curthread())->td_proc)->p_pid );
(&afs_xbrs)->src_indicator = 301; } while (0);
685 afs_brsWaiters--;
686 }
687}
688
689#ifdef AFS_AIX41_ENV
690/* AIX 4.1 has a much different sleep/wakeup mechanism available for use.
691 * The modifications here will work for either a UP or MP machine.
692 */
693struct buf *afs_asyncbuf = (struct buf *)0;
694tid_t afs_asyncbuf_cv = EVENT_NULL;
695afs_int32 afs_biodcnt = 0;
696
697/* in implementing this, I assumed that all external linked lists were
698 * null-terminated.
699 *
700 * Several places in this code traverse a linked list. The algorithm
701 * used here is probably unfamiliar to most people. Careful examination
702 * will show that it eliminates an assignment inside the loop, as compared
703 * to the standard algorithm, at the cost of occasionally using an extra
704 * variable.
705 */
706
707/* get_bioreq()
708 *
709 * This function obtains, and returns, a pointer to a buffer for
710 * processing by a daemon. It sleeps until such a buffer is available.
711 * The source of buffers for it is the list afs_asyncbuf (see also
712 * afs_gn_strategy). This function may be invoked concurrently by
713 * several processes, that is, several instances of the same daemon.
714 * afs_gn_strategy, which adds buffers to the list, runs at interrupt
715 * level, while get_bioreq runs at process level.
716 *
717 * Since AIX 4.1 can wake just one process at a time, the separate sleep
718 * addresses have been removed.
719 * Note that the kernel_lock is held until the e_sleep_thread() occurs.
720 * The afs_asyncbuf_lock is primarily used to serialize access between
721 * process and interrupts.
722 */
723Simple_lock afs_asyncbuf_lock;
724struct buf *
725afs_get_bioreq()
726{
727 struct buf *bp = NULL((void *)0);
728 struct buf *bestbp;
729 struct buf **bestlbpP, **lbpP;
730 long bestage, stop;
731 struct buf *t1P, *t2P; /* temp pointers for list manipulation */
732 int oldPriority;
733 afs_uint32 wait_ret;
734 struct afs_bioqueue *s;
735
736 /* ??? Does the forward pointer of the returned buffer need to be NULL?
737 */
738
739 /* Disable interrupts from the strategy function, and save the
740 * prior priority level and lock access to the afs_asyncbuf.
741 */
742 AFS_GUNLOCK()do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)), (0),
"/home/wollman/openafs/src/afs/afs_daemons.c", 742); } while
(0);
743 oldPriority = disable_lock(INTMAX, &afs_asyncbuf_lock);
744
745 while (1) {
746 if (afs_asyncbuf) {
747 /* look for oldest buffer */
748 bp = bestbp = afs_asyncbuf;
749 bestage = (long)bestbp->av_back;
750 bestlbpP = &afs_asyncbuf;
751 while (1) {
752 lbpP = &bp->av_forw;
753 bp = *lbpP;
754 if (!bp)
755 break;
756 if ((long)bp->av_back - bestage < 0) {
757 bestbp = bp;
758 bestlbpP = lbpP;
759 bestage = (long)bp->av_back;
760 }
761 }
762 bp = bestbp;
763 *bestlbpP = bp->av_forw;
764 break;
765 } else {
766 /* If afs_asyncbuf is null, it is necessary to go to sleep.
767 * e_wakeup_one() ensures that only one thread wakes.
768 */
769 int interrupted;
770 /* The LOCK_HANDLER indicates to e_sleep_thread to only drop the
771 * lock on an MP machine.
772 */
773 interrupted =
774 e_sleep_thread(&afs_asyncbuf_cv, &afs_asyncbuf_lock,
775 LOCK_HANDLER | INTERRUPTIBLE);
776 if (interrupted == THREAD_INTERRUPTED) {
777 /* re-enable interrupts from strategy */
778 unlock_enable(oldPriority, &afs_asyncbuf_lock);
779 AFS_GLOCK()do { (void)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 779); (void)0; } while (0);
780 return (NULL((void *)0));
781 }
782 } /* end of "else asyncbuf is empty" */
783 } /* end of "inner loop" */
784
785 /*assert (bp); */
786
787 unlock_enable(oldPriority, &afs_asyncbuf_lock);
788 AFS_GLOCK()do { (void)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 788); (void)0; } while (0);
789
790 /* For the convenience of other code, replace the gnodes in
791 * the b_vp field of bp and the other buffers on the b_work
792 * chain with the corresponding vnodes.
793 *
794 * ??? what happens to the gnodes? They're not just cut loose,
795 * are they?
796 */
797 for (t1P = bp;;) {
798 t2P = (struct buf *)t1P->b_work;
799 t1P->b_vp = ((struct gnode *)t1P->b_vp)->gn_vnode;
800 if (!t2P)
801 break;
802
803 t1P = (struct buf *)t2P->b_work;
804 t2P->b_vp = ((struct gnode *)t2P->b_vp)->gn_vnode;
805 if (!t1P)
806 break;
807 }
808
809 /* If the buffer does not specify I/O, it may immediately
810 * be returned to the caller. This condition is detected
811 * by examining the buffer's flags (the b_flags field). If
812 * the B_PFPROT bit is set, the buffer represents a protection
813 * violation, rather than a request for I/O. The remainder
814 * of the outer loop handles the case where the B_PFPROT bit is clear.
815 */
816 if (bp->b_flags & B_PFPROT) {
817 return (bp);
818 }
819 return (bp);
820
821} /* end of function get_bioreq() */
822
823
824/* afs_BioDaemon
825 *
826 * This function is the daemon. It is called from the syscall
827 * interface. Ordinarily, a script or an administrator will run a
828 * daemon startup utility, specifying the number of I/O daemons to
829 * run. The utility will fork off that number of processes,
830 * each making the appropriate syscall, which will cause this
831 * function to be invoked.
832 */
833static int afs_initbiod = 0; /* this is self-initializing code */
834int DOvmlock = 0;
835int
836afs_BioDaemon(afs_int32 nbiods)
837{
838 afs_int32 code, s, pflg = 0;
839 label_t jmpbuf;
840 struct buf *bp, *bp1, *tbp1, *tbp2; /* temp pointers only */
841 caddr_t tmpaddr;
842 struct vnode *vp;
843 struct vcache *vcp;
844 char tmperr;
845 if (!afs_initbiod) {
846 /* XXX ###1 XXX */
847 afs_initbiod = 1;
848 /* pin lock, since we'll be using it in an interrupt. */
849 lock_alloc(&afs_asyncbuf_lock, LOCK_ALLOC_PIN, 2, 1);
850 simple_lock_init(&afs_asyncbuf_lock);
851 pin(&afs_asyncbuf, sizeof(struct buf *));
852 pin(&afs_asyncbuf_cv, sizeof(afs_int32));
853 }
854
855 /* Ignore HUP signals... */
856 {
857 sigset_t sigbits, osigbits;
858 /*
859 * add SIGHUP to the set of already masked signals
860 */
861 SIGFILLSET(sigbits)do { int __i; for (__i = 0; __i < 4; __i++) (sigbits).__bits
[__i] = ~0U; } while (0); /* allow all signals */
862 SIGDELSET(sigbits, SIGHUP)((sigbits).__bits[(((1) - 1) >> 5)] &= ~(1 <<
(((1) - 1) & 31))); /* except SIGHUP */
863 limit_sigs(&sigbits, &osigbits); /* and already masked */
864 }
865 /* Main body starts here -- this is an intentional infinite loop, and
866 * should NEVER exit
867 *
868 * Now, the loop will exit if get_bioreq() returns NULL, indicating
869 * that we've been interrupted.
870 */
871 while (1) {
872 bp = afs_get_bioreq();
873 if (!bp)
874 break; /* we were interrupted */
875 if (code = setjmpx(&jmpbuf)) {
876 /* This should not have happend, maybe a lack of resources */
877 AFS_GUNLOCK()do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)), (0),
"/home/wollman/openafs/src/afs/afs_daemons.c", 877); } while
(0);
878 s = disable_lock(INTMAX, &afs_asyncbuf_lock);
879 for (bp1 = bp; bp; bp = bp1) {
880 if (bp1)
881 bp1 = (struct buf *)bp1->b_work;
882 bp->b_actf = 0;
883 bp->b_error = code;
884 bp->b_flags |= B_ERROR;
885 iodonebiodone(bp);
886 }
887 unlock_enable(s, &afs_asyncbuf_lock);
888 AFS_GLOCK()do { (void)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 888); (void)0; } while (0);
889 continue;
890 }
891 vcp = VTOAFS(bp->b_vp)((struct vcache *)(bp->b_vp)->v_data);
892 if (bp->b_flags & B_PFSTORE) { /* XXXX */
893 ObtainWriteLock(&vcp->lock, 404)do { ; if (!(&vcp->lock)->excl_locked && !(
&vcp->lock)->readers_reading) (&vcp->lock) ->
excl_locked = 2; else Afs_Lock_Obtain(&vcp->lock, 2);
(&vcp->lock)->pid_writer = (((__curthread())->td_proc
)->p_pid ); (&vcp->lock)->src_indicator = 404; }
while (0);
894 if (vcp->v.v_gnode->gn_mwrcnt) {
895 afs_offs_t newlength =
896 (afs_offs_t) dbtob(bp->b_blkno)((off_t)(bp->b_blkno) << 9) + bp->b_bcount;
897 if (vcp->f.m.Length < newlength) {
898 afs_Trace4(afs_iclSetp, CM_TRACE_SETLENGTH,(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event4(afs_iclSetp, (701087886L), (1<<24)+((4)
<<18)+((1)<<12)+((8)<<6)+(8), (long)("/home/wollman/openafs/src/afs/afs_daemons.c"
), (long)(900), (long)((&vcp->f.m.Length)), (long)((&
newlength))) : 0)
899 ICL_TYPE_STRING, __FILE__, ICL_TYPE_LONG,(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event4(afs_iclSetp, (701087886L), (1<<24)+((4)
<<18)+((1)<<12)+((8)<<6)+(8), (long)("/home/wollman/openafs/src/afs/afs_daemons.c"
), (long)(900), (long)((&vcp->f.m.Length)), (long)((&
newlength))) : 0)
900 __LINE__, ICL_TYPE_OFFSET,(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event4(afs_iclSetp, (701087886L), (1<<24)+((4)
<<18)+((1)<<12)+((8)<<6)+(8), (long)("/home/wollman/openafs/src/afs/afs_daemons.c"
), (long)(900), (long)((&vcp->f.m.Length)), (long)((&
newlength))) : 0)
901 ICL_HANDLE_OFFSET(vcp->f.m.Length),(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event4(afs_iclSetp, (701087886L), (1<<24)+((4)
<<18)+((1)<<12)+((8)<<6)+(8), (long)("/home/wollman/openafs/src/afs/afs_daemons.c"
), (long)(900), (long)((&vcp->f.m.Length)), (long)((&
newlength))) : 0)
902 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(newlength))(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event4(afs_iclSetp, (701087886L), (1<<24)+((4)
<<18)+((1)<<12)+((8)<<6)+(8), (long)("/home/wollman/openafs/src/afs/afs_daemons.c"
), (long)(900), (long)((&vcp->f.m.Length)), (long)((&
newlength))) : 0);
903 vcp->f.m.Length = newlength;
904 }
905 }
906 ReleaseWriteLock(&vcp->lock)do { ; (&vcp->lock)->excl_locked &= ~2; if ((&
vcp->lock)->wait_states) Afs_Lock_ReleaseR(&vcp->
lock); (&vcp->lock)->pid_writer=0; } while (0);
907 }
908 /* If the buffer represents a protection violation, rather than
909 * an actual request for I/O, no special action need be taken.
910 */
911 if (bp->b_flags & B_PFPROT) {
912 iodonebiodone(bp); /* Notify all users of the buffer that we're done */
913 clrjmpx(&jmpbuf);
914 continue;
915 }
916 if (DOvmlock)
917 ObtainWriteLock(&vcp->pvmlock, 211)do { ; if (!(&vcp->pvmlock)->excl_locked &&
!(&vcp->pvmlock)->readers_reading) (&vcp->pvmlock
) -> excl_locked = 2; else Afs_Lock_Obtain(&vcp->pvmlock
, 2); (&vcp->pvmlock)->pid_writer = (((__curthread(
))->td_proc)->p_pid ); (&vcp->pvmlock)->src_indicator
= 211; } while (0);
918 /*
919 * First map its data area to a region in the current address space
920 * by calling vm_att with the subspace identifier, and a pointer to
921 * the data area. vm_att returns a new data area pointer, but we
922 * also want to hang onto the old one.
923 */
924 tmpaddr = bp->b_baddr;
925 bp->b_baddr = (caddr_t) vm_att(bp->b_xmemd.subspace_id, tmpaddr);
926 tmperr = afs_ustrategy(bp); /* temp variable saves offset calculation */
927 if (tmperr) { /* in non-error case */
928 bp->b_flags |= B_ERROR; /* should other flags remain set ??? */
929 bp->b_error = tmperr;
930 }
931
932 /* Unmap the buffer's data area by calling vm_det. Reset data area
933 * to the value that we saved above.
934 */
935 vm_det(bp->b_baddr);
936 bp->b_baddr = tmpaddr;
937
938 /*
939 * buffer may be linked with other buffers via the b_work field.
940 * See also afs_gn_strategy. For each buffer in the chain (including
941 * bp) notify all users of the buffer that the daemon is finished
942 * using it by calling iodone.
943 * assumes iodone can modify the b_work field.
944 */
945 for (tbp1 = bp;;) {
946 tbp2 = (struct buf *)tbp1->b_work;
947 iodonebiodone(tbp1);
948 if (!tbp2)
949 break;
950
951 tbp1 = (struct buf *)tbp2->b_work;
952 iodonebiodone(tbp2);
953 if (!tbp1)
954 break;
955 }
956 if (DOvmlock)
957 ReleaseWriteLock(&vcp->pvmlock)do { ; (&vcp->pvmlock)->excl_locked &= ~2; if (
(&vcp->pvmlock)->wait_states) Afs_Lock_ReleaseR(&
vcp->pvmlock); (&vcp->pvmlock)->pid_writer=0; } while
(0); /* Unlock the vnode. */
958 clrjmpx(&jmpbuf);
959 } /* infinite loop (unless we're interrupted) */
960} /* end of afs_BioDaemon() */
961
962#endif /* AFS_AIX41_ENV */
963
964
965int afs_nbrs = 0;
966static_inlinestatic inline void
967afs_BackgroundDaemon_once(void)
968{
969 LOCK_INIT(&afs_xbrs, "afs_xbrs")Lock_Init(&afs_xbrs);
970 memset(afs_brs, 0, sizeof(afs_brs));
971 brsInit = 1;
972#if defined (AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
973 /*
974 * steal the first daemon for doing delayed DSlot flushing
975 * (see afs_GetDownDSlot)
976 */
977 AFS_GUNLOCK()do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)), (0),
"/home/wollman/openafs/src/afs/afs_daemons.c", 977); } while
(0);
978 afs_sgidaemon();
979 exit(CLD_EXITED1, 0);
980#endif
981}
982
983static_inlinestatic inline void
984brequest_release(struct brequest *tb)
985{
986 if (tb->vc) {
987 AFS_RELE(AFSTOV(tb->vc))do { do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)),
(0), "/home/wollman/openafs/src/afs/afs_daemons.c", 987); } while
(0); do { vrele(((tb->vc)->v)); } while(0);; do { (void
)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 987); (void)0; } while (0); } while (0); /* MUST call vnode layer or could lose vnodes */
988 tb->vc = NULL((void *)0);
989 }
990 if (tb->cred) {
991 crfree(tb->cred);
992 tb->cred = (afs_ucred_t *)0;
993 }
994 afs_BRelease(tb); /* this grabs and releases afs_xbrs lock */
995}
996
997#ifdef AFS_DARWIN80_ENV
998int
999afs_BackgroundDaemon(struct afs_uspc_param *uspc, void *param1, void *param2)
1000#else
1001void
1002afs_BackgroundDaemon(void)
1003#endif
1004{
1005 struct brequest *tb;
1006 int i, foundAny;
1007
1008 AFS_STATCNT(afs_BackgroundDaemon)((afs_cmstats.callInfo.C_afs_BackgroundDaemon)++);
1009 /* initialize subsystem */
1010 if (brsInit == 0)
1011 /* Irix with "short stack" exits */
1012 afs_BackgroundDaemon_once();
1013
1014#ifdef AFS_DARWIN80_ENV
1015 /* If it's a re-entering syscall, complete the request and release */
1016 if (uspc->ts > -1) {
1017 tb = afs_brs;
1018 for (i = 0; i < NBRS15; i++, tb++) {
1019 if (tb->ts == uspc->ts) {
1020 /* copy the userspace status back in */
1021 ((struct afs_uspc_param *) tb->ptr_parm[0])->retval =
1022 uspc->retval;
1023 /* mark it valid and notify our caller */
1024 tb->flags |= BUVALID2;
1025 if (tb->flags & BUWAIT4) {
1026 tb->flags &= ~BUWAIT4;
1027 afs_osi_Wakeup(tb);
1028 }
1029 brequest_release(tb);
1030 break;
1031 }
1032 }
1033 } else {
1034 afs_osi_MaskUserLoop();
1035#endif
1036 /* Otherwise it's a new one */
1037 afs_nbrs++;
1038#ifdef AFS_DARWIN80_ENV
1039 }
1040#endif
1041
1042 ObtainWriteLock(&afs_xbrs, 302)do { ; if (!(&afs_xbrs)->excl_locked && !(&
afs_xbrs)->readers_reading) (&afs_xbrs) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xbrs, 2); (&afs_xbrs)
->pid_writer = (((__curthread())->td_proc)->p_pid );
(&afs_xbrs)->src_indicator = 302; } while (0);
1043 while (1) {
1044 int min_ts = 0;
1045 struct brequest *min_tb = NULL((void *)0);
1046
1047 if (afs_termState == AFSOP_STOP_BKG212) {
1048 if (--afs_nbrs <= 0)
1049 afs_termState = AFSOP_STOP_TRUNCDAEMON213;
1050 ReleaseWriteLock(&afs_xbrs)do { ; (&afs_xbrs)->excl_locked &= ~2; if ((&afs_xbrs
)->wait_states) Afs_Lock_ReleaseR(&afs_xbrs); (&afs_xbrs
)->pid_writer=0; } while (0);
1051 afs_osi_Wakeup(&afs_termState);
1052#ifdef AFS_DARWIN80_ENV
1053 return -2;
1054#else
1055 return;
1056#endif
1057 }
1058
1059 /* find a request */
1060 tb = afs_brs;
1061 foundAny = 0;
1062 for (i = 0; i < NBRS15; i++, tb++) {
1063 /* look for request with smallest ts */
1064 if ((tb->refCount > 0) && !(tb->flags & BSTARTED1)) {
1065 /* new request, not yet picked up */
1066 if ((min_tb && (min_ts - tb->ts > 0)) || !min_tb) {
1067 min_tb = tb;
1068 min_ts = tb->ts;
1069 }
1070 }
1071 }
1072 if ((tb = min_tb)) {
1073 /* claim and process this request */
1074 tb->flags |= BSTARTED1;
1075 ReleaseWriteLock(&afs_xbrs)do { ; (&afs_xbrs)->excl_locked &= ~2; if ((&afs_xbrs
)->wait_states) Afs_Lock_ReleaseR(&afs_xbrs); (&afs_xbrs
)->pid_writer=0; } while (0);
1076 foundAny = 1;
1077 afs_Trace1(afs_iclSetp, CM_TRACE_BKG1, ICL_TYPE_INT32,(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event1(afs_iclSetp, (701087799L), (1<<24)+((7)
<<18), (long)(tb->opcode)) : 0)
1078 tb->opcode)(((afs_iclSetp) && (afs_iclSetp->states & 2)) ?
afs_icl_Event1(afs_iclSetp, (701087799L), (1<<24)+((7)
<<18), (long)(tb->opcode)) : 0);
1079 if (tb->opcode == BOP_FETCH1)
1080 BPrefetch(tb);
1081#if defined(AFS_CACHE_BYPASS)
1082 else if (tb->opcode == BOP_FETCH_NOCACHE)
1083 BPrefetchNoCache(tb);
1084#endif
1085 else if (tb->opcode == BOP_STORE2)
1086 BStore(tb);
1087 else if (tb->opcode == BOP_PATH3)
1088 BPath(tb);
1089#ifdef AFS_DARWIN80_ENV
1090 else if (tb->opcode == BOP_MOVE) {
1091 memcpy(uspc, (struct afs_uspc_param *) tb->ptr_parm[0],
1092 sizeof(struct afs_uspc_param));
1093 uspc->ts = tb->ts;
1094 /* string lengths capped in move vop; copy NUL tho */
1095 memcpy(param1, (char *)tb->ptr_parm[1],
1096 strlen(tb->ptr_parm[1])+1);
1097 memcpy(param2, (char *)tb->ptr_parm[2],
1098 strlen(tb->ptr_parm[2])+1);
1099 return 0;
1100 }
1101#endif
1102 else
1103 panic("background bop");
1104 brequest_release(tb);
1105 ObtainWriteLock(&afs_xbrs, 305)do { ; if (!(&afs_xbrs)->excl_locked && !(&
afs_xbrs)->readers_reading) (&afs_xbrs) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xbrs, 2); (&afs_xbrs)
->pid_writer = (((__curthread())->td_proc)->p_pid );
(&afs_xbrs)->src_indicator = 305; } while (0);
1106 }
1107 if (!foundAny) {
1108 /* wait for new request */
1109 afs_brsDaemons++;
1110 ReleaseWriteLock(&afs_xbrs)do { ; (&afs_xbrs)->excl_locked &= ~2; if ((&afs_xbrs
)->wait_states) Afs_Lock_ReleaseR(&afs_xbrs); (&afs_xbrs
)->pid_writer=0; } while (0);
1111 afs_osi_Sleep(&afs_brsDaemons);
1112 ObtainWriteLock(&afs_xbrs, 307)do { ; if (!(&afs_xbrs)->excl_locked && !(&
afs_xbrs)->readers_reading) (&afs_xbrs) -> excl_locked
= 2; else Afs_Lock_Obtain(&afs_xbrs, 2); (&afs_xbrs)
->pid_writer = (((__curthread())->td_proc)->p_pid );
(&afs_xbrs)->src_indicator = 307; } while (0);
1113 afs_brsDaemons--;
1114 }
1115 }
1116#ifdef AFS_DARWIN80_ENV
1117 return -2;
1118#endif
1119}
1120
1121
1122void
1123shutdown_daemons(void)
1124{
1125 AFS_STATCNT(shutdown_daemons)((afs_cmstats.callInfo.C_shutdown_daemons)++);
1126 if (afs_cold_shutdown) {
1127 afs_brsDaemons = brsInit = 0;
1128 rxepoch_checked = afs_nbrs = 0;
1129 memset(afs_brs, 0, sizeof(afs_brs));
1130 memset(&afs_xbrs, 0, sizeof(afs_lock_t));
1131 afs_brsWaiters = 0;
1132#ifdef AFS_AIX41_ENV
1133 lock_free(&afs_asyncbuf_lock);
1134 unpin(&afs_asyncbuf, sizeof(struct buf *));
1135 unpin(&afs_asyncbuf_cv, sizeof(afs_int32));
1136 afs_initbiod = 0;
1137#endif
1138 }
1139}
1140
1141#if defined(AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
1142/*
1143 * sgi - daemon - handles certain operations that otherwise
1144 * would use up too much kernel stack space
1145 *
1146 * This all assumes that since the caller must have the xdcache lock
1147 * exclusively that the list will never be more than one long
1148 * and noone else can attempt to add anything until we're done.
1149 */
1150SV_TYPE afs_sgibksync;
1151SV_TYPE afs_sgibkwait;
1152lock_t afs_sgibklock;
1153struct dcache *afs_sgibklist;
1154
1155int
1156afs_sgidaemon(void)
1157{
1158 int s;
1159 struct dcache *tdc;
1160
1161 if (afs_sgibklock == NULL((void *)0)) {
1162 SV_INIT(&afs_sgibksync, "bksync", 0, 0);
1163 SV_INIT(&afs_sgibkwait, "bkwait", 0, 0);
1164 SPINLOCK_INIT(&afs_sgibklock, "bklock");
1165 }
1166 s = SPLOCK(afs_sgibklock);
1167 for (;;) {
1168 /* wait for something to do */
1169 SP_WAIT(afs_sgibklock, s, &afs_sgibksync, PINOD((80) + 8));
1170 osi_Assert(afs_sgibklist)(void)((afs_sgibklist) || (osi_AssertFailK( "afs_sgibklist" ,
"/home/wollman/openafs/src/afs/afs_daemons.c", 1170), 0));
1171
1172 /* XX will probably need to generalize to real list someday */
1173 s = SPLOCK(afs_sgibklock);
1174 while (afs_sgibklist) {
1175 tdc = afs_sgibklist;
1176 afs_sgibklist = NULL((void *)0);
1177 SPUNLOCK(afs_sgibklock, s);
1178 AFS_GLOCK()do { (void)0; _mtx_lock_flags(((&afs_global_mtx)), (0), "/home/wollman/openafs/src/afs/afs_daemons.c"
, 1178); (void)0; } while (0);
1179 tdc->dflags &= ~DFEntryMod0x02;
1180 afs_WriteDCache(tdc, 1);
1181 AFS_GUNLOCK()do { (void)0; _mtx_unlock_flags(((&afs_global_mtx)), (0),
"/home/wollman/openafs/src/afs/afs_daemons.c", 1181); } while
(0);
1182 s = SPLOCK(afs_sgibklock);
1183 }
1184
1185 /* done all the work - wake everyone up */
1186 while (SV_SIGNAL(&afs_sgibkwait));
1187 }
1188}
1189#endif