2 * Copyright 2000, International Business Machines Corporation and others.
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
10 #include <afsconfig.h>
11 #include "afs/param.h"
18 #include <sys/sleep.h>
21 #include "afs/sysincludes.h" /* Standard vendor system headers */
22 #include "afsincludes.h" /* Afs-based standard headers */
23 #include "afs/afs_stats.h" /* statistics gathering code */
24 #include "afs/afs_cbqueue.h"
26 #include <sys/adspace.h> /* for vm_att(), vm_det() */
29 #if defined(AFS_CACHE_BYPASS)
30 #include "afs/afs_bypasscache.h"
31 #endif// defined(AFS_CACHE_BYPASS)
32 /* background request queue size */
33 afs_lock_t afs_xbrs; /* lock for brs */
34 static int brsInit = 0;
35 short afs_brsWaiters = 0; /* number of users waiting for brs buffers */
36 short afs_brsDaemons = 0; /* number of daemons waiting for brs requests */
37 struct brequest afs_brs[NBRS]; /* request structures */
38 struct afs_osi_WaitHandle AFS_WaitHandler, AFS_CSWaitHandler;
39 static int afs_brs_count = 0; /* request counter, to service reqs in order */
41 static int rxepoch_checked = 0;
42 #define afs_CheckRXEpoch() {if (rxepoch_checked == 0 && rxkad_EpochWasSet) { \
43 rxepoch_checked = 1; afs_GCUserData(/* force flag */ 1); } }
45 /* PAG garbage collection */
46 /* We induce a compile error if param.h does not define AFS_GCPAGS */
47 afs_int32 afs_gcpags = AFS_GCPAGS;
48 afs_int32 afs_gcpags_procsize = 0;
50 afs_int32 afs_CheckServerDaemonStarted = 0;
51 #ifndef DEFAULT_PROBE_INTERVAL
52 #define DEFAULT_PROBE_INTERVAL 30 /* default to 3 min */
54 afs_int32 afs_probe_interval = DEFAULT_PROBE_INTERVAL;
55 afs_int32 afs_probe_all_interval = 600;
56 afs_int32 afs_nat_probe_interval = 60;
57 afs_int32 afs_preCache = 0;
59 #define PROBE_WAIT() (1000 * (afs_probe_interval - ((afs_random() & 0x7fffffff) \
60 % (afs_probe_interval/2))))
63 afs_SetCheckServerNATmode(int isnat)
65 static afs_int32 old_intvl, old_all_intvl;
68 if (isnat && !wasnat) {
69 old_intvl = afs_probe_interval;
70 old_all_intvl = afs_probe_all_interval;
71 afs_probe_interval = afs_nat_probe_interval;
72 afs_probe_all_interval = afs_nat_probe_interval;
73 afs_osi_CancelWait(&AFS_CSWaitHandler);
74 } else if (!isnat && wasnat) {
75 afs_probe_interval = old_intvl;
76 afs_probe_all_interval = old_all_intvl;
82 afs_CheckServerDaemon(void)
84 afs_int32 now, delay, lastCheck, last10MinCheck;
86 afs_CheckServerDaemonStarted = 1;
88 while (afs_initState < 101)
89 afs_osi_Sleep(&afs_initState);
90 afs_osi_Wait(PROBE_WAIT(), &AFS_CSWaitHandler, 0);
92 last10MinCheck = lastCheck = osi_Time();
94 if (afs_termState == AFSOP_STOP_CS) {
95 afs_termState = AFSOP_STOP_BKG;
96 afs_osi_Wakeup(&afs_termState);
101 if (afs_probe_interval + lastCheck <= now) {
102 afs_CheckServers(1, NULL); /* check down servers */
103 lastCheck = now = osi_Time();
106 if (afs_probe_all_interval + last10MinCheck <= now) {
107 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, afs_probe_all_interval);
108 afs_CheckServers(0, NULL);
109 last10MinCheck = now = osi_Time();
111 /* shutdown check. */
112 if (afs_termState == AFSOP_STOP_CS) {
113 afs_termState = AFSOP_STOP_BKG;
114 afs_osi_Wakeup(&afs_termState);
118 /* Compute time to next probe. */
119 delay = afs_probe_interval + lastCheck;
120 if (delay > afs_probe_all_interval + last10MinCheck)
121 delay = afs_probe_all_interval + last10MinCheck;
125 afs_osi_Wait(delay * 1000, &AFS_CSWaitHandler, 0);
127 afs_CheckServerDaemonStarted = 0;
130 extern int vfs_context_ref;
136 struct afs_exporter *exporter;
138 afs_int32 last3MinCheck, last10MinCheck, last60MinCheck, lastNMinCheck;
139 afs_int32 last1MinCheck;
140 afs_uint32 lastCBSlotBump;
143 AFS_STATCNT(afs_Daemon);
144 last1MinCheck = last3MinCheck = last60MinCheck = last10MinCheck =
147 afs_rootFid.Fid.Volume = 0;
148 while (afs_initState < 101)
149 afs_osi_Sleep(&afs_initState);
151 #ifdef AFS_DARWIN80_ENV
152 if (afs_osi_ctxtp_initialized)
153 osi_Panic("vfs context already initialized");
154 while (afs_osi_ctxtp && vfs_context_ref)
155 afs_osi_Sleep(&afs_osi_ctxtp);
156 if (afs_osi_ctxtp && !vfs_context_ref)
157 vfs_context_rele(afs_osi_ctxtp);
158 afs_osi_ctxtp = vfs_context_create(NULL);
159 afs_osi_ctxtp_initialized = 1;
162 lastCBSlotBump = now;
164 /* when a lot of clients are booted simultaneously, they develop
165 * annoying synchronous VL server bashing behaviors. So we stagger them.
167 last1MinCheck = now + ((afs_random() & 0x7fffffff) % 60); /* an extra 30 */
168 last3MinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
169 last60MinCheck = now - 1800 + ((afs_random() & 0x7fffffff) % 3600);
170 last10MinCheck = now - 300 + ((afs_random() & 0x7fffffff) % 600);
171 lastNMinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
173 /* start off with afs_initState >= 101 (basic init done) */
175 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
177 /* things to do every 20 seconds or less - required by protocol spec */
179 afs_FlushActiveVcaches(0); /* flush NFS writes */
180 afs_FlushVCBs(1); /* flush queued callbacks */
181 afs_MaybeWakeupTruncateDaemon(); /* free cache space if have too */
182 rx_CheckPackets(); /* Does RX need more packets? */
185 if (lastCBSlotBump + CBHTSLOTLEN < now) { /* pretty time-dependant */
186 lastCBSlotBump = now;
187 if (afs_BumpBase()) {
188 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
192 if (last1MinCheck + 60 < now) {
193 /* things to do every minute */
194 DFlush(); /* write out dir buffers */
195 afs_WriteThroughDSlots(); /* write through cacheinfo entries */
196 ObtainWriteLock(&afs_xvcache, 736);
197 afs_FlushReclaimedVcaches();
198 ReleaseWriteLock(&afs_xvcache);
199 afs_FlushActiveVcaches(1); /* keep flocks held & flush nfs writes */
201 #ifdef AFS_DISCON_ENV
202 afs_StoreDirtyVcaches();
209 if (last3MinCheck + 180 < now) {
210 afs_CheckTokenCache(); /* check for access cache resets due to expired
214 if (!afs_CheckServerDaemonStarted) {
215 /* Do the check here if the correct afsd is not installed. */
218 printf("Please install afsd with check server daemon.\n");
220 if (lastNMinCheck + afs_probe_interval < now) {
221 /* only check down servers */
222 afs_CheckServers(1, NULL);
226 if (last10MinCheck + 600 < now) {
227 #ifdef AFS_USERSPACE_IP_ADDR
228 extern int rxi_GetcbiInfo(void);
230 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, 600);
231 #ifdef AFS_USERSPACE_IP_ADDR
232 if (rxi_GetcbiInfo()) { /* addresses changed from last time */
235 #else /* AFS_USERSPACE_IP_ADDR */
236 if (rxi_GetIFInfo()) { /* addresses changed from last time */
239 #endif /* else AFS_USERSPACE_IP_ADDR */
240 if (!afs_CheckServerDaemonStarted)
241 afs_CheckServers(0, NULL);
242 afs_GCUserData(0); /* gc old conns */
243 /* This is probably the wrong way of doing GC for the various exporters but it will suffice for a while */
244 for (exporter = root_exported; exporter;
245 exporter = exporter->exp_next) {
246 (void)EXP_GC(exporter, 0); /* Generalize params */
251 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED |
255 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED |
260 last10MinCheck = now;
262 if (last60MinCheck + 3600 < now) {
263 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEVOLUME, ICL_TYPE_INT32,
265 afs_CheckRootVolume();
267 if (afs_gcpags == AFS_GCPAGS_OK) {
272 last60MinCheck = now;
274 if (afs_initState < 300) { /* while things ain't rosy */
275 code = afs_CheckRootVolume();
277 afs_initState = 300; /* succeeded */
278 if (afs_initState < 200)
279 afs_initState = 200; /* tried once */
280 afs_osi_Wakeup(&afs_initState);
283 /* 18285 is because we're trying to divide evenly into 128, that is,
284 * CBSlotLen, while staying just under 20 seconds. If CBSlotLen
285 * changes, should probably change this interval, too.
286 * Some of the preceding actions may take quite some time, so we
287 * might not want to wait the entire interval */
288 now = 18285 - (osi_Time() - now);
290 afs_osi_Wait(now, &AFS_WaitHandler, 0);
293 if (afs_termState == AFSOP_STOP_AFS) {
294 if (afs_CheckServerDaemonStarted)
295 afs_termState = AFSOP_STOP_CS;
297 afs_termState = AFSOP_STOP_BKG;
298 afs_osi_Wakeup(&afs_termState);
305 afs_CheckRootVolume(void)
307 char rootVolName[32];
308 struct volume *tvp = NULL;
309 int usingDynroot = afs_GetDynrootEnable();
312 AFS_STATCNT(afs_CheckRootVolume);
313 if (*afs_rootVolumeName == 0) {
314 strcpy(rootVolName, "root.afs");
316 strcpy(rootVolName, afs_rootVolumeName);
320 afs_GetDynrootFid(&afs_rootFid);
321 tvp = afs_GetVolume(&afs_rootFid, NULL, READ_LOCK);
323 struct cell *lc = afs_GetPrimaryCell(READ_LOCK);
327 localcell = lc->cellNum;
328 afs_PutCell(lc, READ_LOCK);
329 tvp = afs_GetVolumeByName(rootVolName, localcell, 1, NULL, READ_LOCK);
332 int len = strlen(rootVolName);
334 if ((len < 9) || strcmp(&rootVolName[len - 9], ".readonly")) {
335 strcpy(buf, rootVolName);
336 afs_strcat(buf, ".readonly");
337 tvp = afs_GetVolumeByName(buf, localcell, 1, NULL, READ_LOCK);
341 int volid = (tvp->roVol ? tvp->roVol : tvp->volume);
342 afs_rootFid.Cell = localcell;
343 if (afs_rootFid.Fid.Volume && afs_rootFid.Fid.Volume != volid
345 /* If we had a root fid before and it changed location we reset
346 * the afs_globalVp so that it will be reevaluated.
347 * Just decrement the reference count. This only occurs during
348 * initial cell setup and can panic the machine if we set the
349 * count to zero and fs checkv is executed when the current
352 #ifdef AFS_LINUX20_ENV
354 struct vrequest treq;
360 afs_rootFid.Fid.Volume = volid;
361 afs_rootFid.Fid.Vnode = 1;
362 afs_rootFid.Fid.Unique = 1;
365 if (afs_InitReq(&treq, credp))
367 vcp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
370 afs_getattr(vcp, &vattr, credp);
371 afs_fill_inode(AFSTOV(vcp), &vattr);
373 dp = d_find_alias(AFSTOV(afs_globalVp));
375 #if defined(AFS_LINUX24_ENV)
376 spin_lock(&dcache_lock);
377 #if defined(AFS_LINUX26_ENV)
378 spin_lock(&dp->d_lock);
381 list_del_init(&dp->d_alias);
382 list_add(&dp->d_alias, &(AFSTOV(vcp)->i_dentry));
383 dp->d_inode = AFSTOV(vcp);
384 #if defined(AFS_LINUX24_ENV)
385 #if defined(AFS_LINUX26_ENV)
386 spin_unlock(&dp->d_lock);
388 spin_unlock(&dcache_lock);
392 AFS_FAST_RELE(afs_globalVp);
398 #ifdef AFS_DARWIN80_ENV
399 afs_PutVCache(afs_globalVp);
401 AFS_FAST_RELE(afs_globalVp);
406 afs_rootFid.Fid.Volume = volid;
407 afs_rootFid.Fid.Vnode = 1;
408 afs_rootFid.Fid.Unique = 1;
412 afs_initState = 300; /* won */
413 afs_osi_Wakeup(&afs_initState);
414 afs_PutVolume(tvp, READ_LOCK);
416 if (afs_rootFid.Fid.Volume)
422 /* ptr_parm 0 is the pathname, size_parm 0 to the fetch is the chunk number */
424 BPath(register struct brequest *ab)
426 register struct dcache *tdc = NULL;
427 struct vcache *tvc = NULL;
428 struct vnode *tvn = NULL;
429 #ifdef AFS_LINUX22_ENV
430 struct dentry *dp = NULL;
432 afs_size_t offset, len;
433 struct vrequest treq;
437 if ((code = afs_InitReq(&treq, ab->cred)))
440 #ifdef AFS_LINUX22_ENV
441 code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &dp);
443 tvn = (struct vnode *)dp->d_inode;
445 code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &tvn);
448 osi_FreeLargeSpace((char *)ab->ptr_parm[0]); /* free path name buffer here */
451 /* now path may not have been in afs, so check that before calling our cache manager */
452 if (!tvn || !IsAfsVnode(tvn)) {
453 /* release it and give up */
455 #ifdef AFS_LINUX22_ENV
464 /* here we know its an afs vnode, so we can get the data for the chunk */
465 tdc = afs_GetDCache(tvc, ab->size_parm[0], &treq, &offset, &len, 1);
469 #ifdef AFS_LINUX22_ENV
476 /* size_parm 0 to the fetch is the chunk number,
477 * ptr_parm 0 is the dcache entry to wakeup,
478 * size_parm 1 is true iff we should release the dcache entry here.
481 BPrefetch(register struct brequest *ab)
483 register struct dcache *tdc;
484 register struct vcache *tvc;
485 afs_size_t offset, len, abyte, totallen = 0;
486 struct vrequest treq;
488 AFS_STATCNT(BPrefetch);
489 if ((len = afs_InitReq(&treq, ab->cred)))
491 abyte = ab->size_parm[0];
494 tdc = afs_GetDCache(tvc, abyte, &treq, &offset, &len, 1);
500 } while ((totallen < afs_preCache) && tdc && (len > 0));
501 /* now, dude may be waiting for us to clear DFFetchReq bit; do so. Can't
502 * use tdc from GetDCache since afs_GetDCache may fail, but someone may
503 * be waiting for our wakeup anyway.
505 tdc = (struct dcache *)(ab->ptr_parm[0]);
506 ObtainSharedLock(&tdc->lock, 640);
507 if (tdc->mflags & DFFetchReq) {
508 UpgradeSToWLock(&tdc->lock, 641);
509 tdc->mflags &= ~DFFetchReq;
510 ReleaseWriteLock(&tdc->lock);
512 ReleaseSharedLock(&tdc->lock);
514 afs_osi_Wakeup(&tdc->validPos);
515 if (ab->size_parm[1]) {
516 afs_PutDCache(tdc); /* put this one back, too */
520 #if defined(AFS_CACHE_BYPASS)
521 #if 1 /* XXX Matt debugging */
525 BPrefetchNoCache(register struct brequest *ab)
527 struct vrequest treq;
530 if ((len = afs_InitReq(&treq, ab->cred)))
534 /* OS-specific prefetch routine */
535 afs_PrefetchNoCache(ab->vc, ab->cred, (struct nocache_read_request *) ab->ptr_parm[0]);
537 #warning Cache-bypass code path not implemented in UKERNEL
543 BStore(register struct brequest *ab)
545 register struct vcache *tvc;
546 register afs_int32 code;
547 struct vrequest treq;
548 #if defined(AFS_SGI_ENV)
549 struct cred *tmpcred;
553 if ((code = afs_InitReq(&treq, ab->cred)))
557 #if defined(AFS_SGI_ENV)
559 * Since StoreOnLastReference can end up calling osi_SyncVM which
560 * calls into VM code that assumes that u.u_cred has the
561 * correct credentials, we set our to theirs for this xaction
563 tmpcred = OSI_GET_CURRENT_CRED();
564 OSI_SET_CURRENT_CRED(ab->cred);
567 * To avoid recursion since the WriteLock may be released during VM
568 * operations, we hold the VOP_RWLOCK across this transaction as
569 * do the other callers of StoreOnLastReference
571 AFS_RWLOCK((vnode_t *) tvc, 1);
573 ObtainWriteLock(&tvc->lock, 209);
574 code = afs_StoreOnLastReference(tvc, &treq);
575 ReleaseWriteLock(&tvc->lock);
576 #if defined(AFS_SGI_ENV)
577 OSI_SET_CURRENT_CRED(tmpcred);
578 AFS_RWUNLOCK((vnode_t *) tvc, 1);
580 /* now set final return code, and wakeup anyone waiting */
581 if ((ab->flags & BUVALID) == 0) {
582 ab->code = afs_CheckCode(code, &treq, 43); /* set final code, since treq doesn't go across processes */
583 ab->flags |= BUVALID;
584 if (ab->flags & BUWAIT) {
585 ab->flags &= ~BUWAIT;
591 /* release a held request buffer */
593 afs_BRelease(register struct brequest *ab)
596 AFS_STATCNT(afs_BRelease);
597 MObtainWriteLock(&afs_xbrs, 294);
598 if (--ab->refCount <= 0) {
602 afs_osi_Wakeup(&afs_brsWaiters);
603 MReleaseWriteLock(&afs_xbrs);
606 /* return true if bkg fetch daemons are all busy */
610 AFS_STATCNT(afs_BBusy);
611 if (afs_brsDaemons > 0)
617 afs_BQueue(register short aopcode, register struct vcache *avc,
618 afs_int32 dontwait, afs_int32 ause, struct AFS_UCRED *acred,
619 afs_size_t asparm0, afs_size_t asparm1, void *apparm0)
622 register struct brequest *tb;
624 AFS_STATCNT(afs_BQueue);
625 MObtainWriteLock(&afs_xbrs, 296);
628 for (i = 0; i < NBRS; i++, tb++) {
629 if (tb->refCount == 0)
634 tb->opcode = aopcode;
639 VN_HOLD(AFSTOV(avc));
641 tb->refCount = ause + 1;
642 tb->size_parm[0] = asparm0;
643 tb->size_parm[1] = asparm1;
644 tb->ptr_parm[0] = apparm0;
647 tb->ts = afs_brs_count++;
648 /* if daemons are waiting for work, wake them up */
649 if (afs_brsDaemons > 0) {
650 afs_osi_Wakeup(&afs_brsDaemons);
652 MReleaseWriteLock(&afs_xbrs);
656 MReleaseWriteLock(&afs_xbrs);
659 /* no free buffers, sleep a while */
661 MReleaseWriteLock(&afs_xbrs);
662 afs_osi_Sleep(&afs_brsWaiters);
663 MObtainWriteLock(&afs_xbrs, 301);
669 /* AIX 4.1 has a much different sleep/wakeup mechanism available for use.
670 * The modifications here will work for either a UP or MP machine.
672 struct buf *afs_asyncbuf = (struct buf *)0;
673 tid_t afs_asyncbuf_cv = EVENT_NULL;
674 afs_int32 afs_biodcnt = 0;
676 /* in implementing this, I assumed that all external linked lists were
679 * Several places in this code traverse a linked list. The algorithm
680 * used here is probably unfamiliar to most people. Careful examination
681 * will show that it eliminates an assignment inside the loop, as compared
682 * to the standard algorithm, at the cost of occasionally using an extra
688 * This function obtains, and returns, a pointer to a buffer for
689 * processing by a daemon. It sleeps until such a buffer is available.
690 * The source of buffers for it is the list afs_asyncbuf (see also
691 * afs_gn_strategy). This function may be invoked concurrently by
692 * several processes, that is, several instances of the same daemon.
693 * afs_gn_strategy, which adds buffers to the list, runs at interrupt
694 * level, while get_bioreq runs at process level.
696 * Since AIX 4.1 can wake just one process at a time, the separate sleep
697 * addresses have been removed.
698 * Note that the kernel_lock is held until the e_sleep_thread() occurs.
699 * The afs_asyncbuf_lock is primarily used to serialize access between
700 * process and interrupts.
702 Simple_lock afs_asyncbuf_lock;
706 struct buf *bp = NULL;
708 struct buf **bestlbpP, **lbpP;
710 struct buf *t1P, *t2P; /* temp pointers for list manipulation */
713 struct afs_bioqueue *s;
715 /* ??? Does the forward pointer of the returned buffer need to be NULL?
718 /* Disable interrupts from the strategy function, and save the
719 * prior priority level and lock access to the afs_asyncbuf.
722 oldPriority = disable_lock(INTMAX, &afs_asyncbuf_lock);
726 /* look for oldest buffer */
727 bp = bestbp = afs_asyncbuf;
728 bestage = (long)bestbp->av_back;
729 bestlbpP = &afs_asyncbuf;
735 if ((long)bp->av_back - bestage < 0) {
738 bestage = (long)bp->av_back;
742 *bestlbpP = bp->av_forw;
745 /* If afs_asyncbuf is null, it is necessary to go to sleep.
746 * e_wakeup_one() ensures that only one thread wakes.
749 /* The LOCK_HANDLER indicates to e_sleep_thread to only drop the
750 * lock on an MP machine.
753 e_sleep_thread(&afs_asyncbuf_cv, &afs_asyncbuf_lock,
754 LOCK_HANDLER | INTERRUPTIBLE);
755 if (interrupted == THREAD_INTERRUPTED) {
756 /* re-enable interrupts from strategy */
757 unlock_enable(oldPriority, &afs_asyncbuf_lock);
761 } /* end of "else asyncbuf is empty" */
762 } /* end of "inner loop" */
766 unlock_enable(oldPriority, &afs_asyncbuf_lock);
769 /* For the convenience of other code, replace the gnodes in
770 * the b_vp field of bp and the other buffers on the b_work
771 * chain with the corresponding vnodes.
773 * ??? what happens to the gnodes? They're not just cut loose,
777 t2P = (struct buf *)t1P->b_work;
778 t1P->b_vp = ((struct gnode *)t1P->b_vp)->gn_vnode;
782 t1P = (struct buf *)t2P->b_work;
783 t2P->b_vp = ((struct gnode *)t2P->b_vp)->gn_vnode;
788 /* If the buffer does not specify I/O, it may immediately
789 * be returned to the caller. This condition is detected
790 * by examining the buffer's flags (the b_flags field). If
791 * the B_PFPROT bit is set, the buffer represents a protection
792 * violation, rather than a request for I/O. The remainder
793 * of the outer loop handles the case where the B_PFPROT bit is clear.
795 if (bp->b_flags & B_PFPROT) {
800 } /* end of function get_bioreq() */
805 * This function is the daemon. It is called from the syscall
806 * interface. Ordinarily, a script or an administrator will run a
807 * daemon startup utility, specifying the number of I/O daemons to
808 * run. The utility will fork off that number of processes,
809 * each making the appropriate syscall, which will cause this
810 * function to be invoked.
812 static int afs_initbiod = 0; /* this is self-initializing code */
815 afs_BioDaemon(afs_int32 nbiods)
817 afs_int32 code, s, pflg = 0;
819 struct buf *bp, *bp1, *tbp1, *tbp2; /* temp pointers only */
827 /* pin lock, since we'll be using it in an interrupt. */
828 lock_alloc(&afs_asyncbuf_lock, LOCK_ALLOC_PIN, 2, 1);
829 simple_lock_init(&afs_asyncbuf_lock);
830 pin(&afs_asyncbuf, sizeof(struct buf *));
831 pin(&afs_asyncbuf_cv, sizeof(afs_int32));
834 /* Ignore HUP signals... */
836 sigset_t sigbits, osigbits;
838 * add SIGHUP to the set of already masked signals
840 SIGFILLSET(sigbits); /* allow all signals */
841 SIGDELSET(sigbits, SIGHUP); /* except SIGHUP */
842 limit_sigs(&sigbits, &osigbits); /* and already masked */
844 /* Main body starts here -- this is an intentional infinite loop, and
847 * Now, the loop will exit if get_bioreq() returns NULL, indicating
848 * that we've been interrupted.
851 bp = afs_get_bioreq();
853 break; /* we were interrupted */
854 if (code = setjmpx(&jmpbuf)) {
855 /* This should not have happend, maybe a lack of resources */
857 s = disable_lock(INTMAX, &afs_asyncbuf_lock);
858 for (bp1 = bp; bp; bp = bp1) {
860 bp1 = (struct buf *)bp1->b_work;
863 bp->b_flags |= B_ERROR;
866 unlock_enable(s, &afs_asyncbuf_lock);
870 vcp = VTOAFS(bp->b_vp);
871 if (bp->b_flags & B_PFSTORE) { /* XXXX */
872 ObtainWriteLock(&vcp->lock, 404);
873 if (vcp->v.v_gnode->gn_mwrcnt) {
874 afs_offs_t newlength =
875 (afs_offs_t) dbtob(bp->b_blkno) + bp->b_bcount;
876 if (vcp->f.m.Length < newlength) {
877 afs_Trace4(afs_iclSetp, CM_TRACE_SETLENGTH,
878 ICL_TYPE_STRING, __FILE__, ICL_TYPE_LONG,
879 __LINE__, ICL_TYPE_OFFSET,
880 ICL_HANDLE_OFFSET(vcp->f.m.Length),
881 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(newlength));
882 vcp->f.m.Length = newlength;
885 ReleaseWriteLock(&vcp->lock);
887 /* If the buffer represents a protection violation, rather than
888 * an actual request for I/O, no special action need be taken.
890 if (bp->b_flags & B_PFPROT) {
891 iodone(bp); /* Notify all users of the buffer that we're done */
896 ObtainWriteLock(&vcp->pvmlock, 211);
898 * First map its data area to a region in the current address space
899 * by calling vm_att with the subspace identifier, and a pointer to
900 * the data area. vm_att returns a new data area pointer, but we
901 * also want to hang onto the old one.
903 tmpaddr = bp->b_baddr;
904 bp->b_baddr = (caddr_t) vm_att(bp->b_xmemd.subspace_id, tmpaddr);
905 tmperr = afs_ustrategy(bp); /* temp variable saves offset calculation */
906 if (tmperr) { /* in non-error case */
907 bp->b_flags |= B_ERROR; /* should other flags remain set ??? */
908 bp->b_error = tmperr;
911 /* Unmap the buffer's data area by calling vm_det. Reset data area
912 * to the value that we saved above.
915 bp->b_baddr = tmpaddr;
918 * buffer may be linked with other buffers via the b_work field.
919 * See also afs_gn_strategy. For each buffer in the chain (including
920 * bp) notify all users of the buffer that the daemon is finished
921 * using it by calling iodone.
922 * assumes iodone can modify the b_work field.
925 tbp2 = (struct buf *)tbp1->b_work;
930 tbp1 = (struct buf *)tbp2->b_work;
936 ReleaseWriteLock(&vcp->pvmlock); /* Unlock the vnode. */
938 } /* infinite loop (unless we're interrupted) */
939 } /* end of afs_BioDaemon() */
941 #endif /* AFS_AIX41_ENV */
946 afs_BackgroundDaemon(void)
951 AFS_STATCNT(afs_BackgroundDaemon);
952 /* initialize subsystem */
954 LOCK_INIT(&afs_xbrs, "afs_xbrs");
955 memset((char *)afs_brs, 0, sizeof(afs_brs));
957 #if defined (AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
959 * steal the first daemon for doing delayed DSlot flushing
960 * (see afs_GetDownDSlot)
969 MObtainWriteLock(&afs_xbrs, 302);
972 struct brequest *min_tb = NULL;
974 if (afs_termState == AFSOP_STOP_BKG) {
976 afs_termState = AFSOP_STOP_TRUNCDAEMON;
977 MReleaseWriteLock(&afs_xbrs);
978 afs_osi_Wakeup(&afs_termState);
985 for (i = 0; i < NBRS; i++, tb++) {
986 /* look for request with smallest ts */
987 if ((tb->refCount > 0) && !(tb->flags & BSTARTED)) {
988 /* new request, not yet picked up */
989 if ((min_tb && (min_ts - tb->ts > 0)) || !min_tb) {
996 /* claim and process this request */
997 tb->flags |= BSTARTED;
998 MReleaseWriteLock(&afs_xbrs);
1000 afs_Trace1(afs_iclSetp, CM_TRACE_BKG1, ICL_TYPE_INT32,
1002 if (tb->opcode == BOP_FETCH)
1004 #if defined(AFS_CACHE_BYPASS)
1005 else if (tb->opcode == BOP_FETCH_NOCACHE)
1006 BPrefetchNoCache(tb);
1008 else if (tb->opcode == BOP_STORE)
1010 else if (tb->opcode == BOP_PATH)
1013 panic("background bop");
1015 AFS_RELE(AFSTOV(tb->vc)); /* MUST call vnode layer or could lose vnodes */
1020 tb->cred = (struct AFS_UCRED *)0;
1022 afs_BRelease(tb); /* this grabs and releases afs_xbrs lock */
1023 MObtainWriteLock(&afs_xbrs, 305);
1026 /* wait for new request */
1028 MReleaseWriteLock(&afs_xbrs);
1029 afs_osi_Sleep(&afs_brsDaemons);
1030 MObtainWriteLock(&afs_xbrs, 307);
1038 shutdown_daemons(void)
1040 AFS_STATCNT(shutdown_daemons);
1041 if (afs_cold_shutdown) {
1042 afs_brsDaemons = brsInit = 0;
1043 rxepoch_checked = afs_nbrs = 0;
1044 memset((char *)afs_brs, 0, sizeof(afs_brs));
1045 memset((char *)&afs_xbrs, 0, sizeof(afs_lock_t));
1047 #ifdef AFS_AIX41_ENV
1048 lock_free(&afs_asyncbuf_lock);
1049 unpin(&afs_asyncbuf, sizeof(struct buf *));
1050 unpin(&afs_asyncbuf_cv, sizeof(afs_int32));
1056 #if defined(AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
1058 * sgi - daemon - handles certain operations that otherwise
1059 * would use up too much kernel stack space
1061 * This all assumes that since the caller must have the xdcache lock
1062 * exclusively that the list will never be more than one long
1063 * and noone else can attempt to add anything until we're done.
1065 SV_TYPE afs_sgibksync;
1066 SV_TYPE afs_sgibkwait;
1067 lock_t afs_sgibklock;
1068 struct dcache *afs_sgibklist;
1076 if (afs_sgibklock == NULL) {
1077 SV_INIT(&afs_sgibksync, "bksync", 0, 0);
1078 SV_INIT(&afs_sgibkwait, "bkwait", 0, 0);
1079 SPINLOCK_INIT(&afs_sgibklock, "bklock");
1081 s = SPLOCK(afs_sgibklock);
1083 /* wait for something to do */
1084 SP_WAIT(afs_sgibklock, s, &afs_sgibksync, PINOD);
1085 osi_Assert(afs_sgibklist);
1087 /* XX will probably need to generalize to real list someday */
1088 s = SPLOCK(afs_sgibklock);
1089 while (afs_sgibklist) {
1090 tdc = afs_sgibklist;
1091 afs_sgibklist = NULL;
1092 SPUNLOCK(afs_sgibklock, s);
1094 tdc->dflags &= ~DFEntryMod;
1095 afs_WriteDCache(tdc, 1);
1097 s = SPLOCK(afs_sgibklock);
1100 /* done all the work - wake everyone up */
1101 while (SV_SIGNAL(&afs_sgibkwait));