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() */
30 /* background request queue size */
31 afs_lock_t afs_xbrs; /* lock for brs */
32 static int brsInit = 0;
33 short afs_brsWaiters = 0; /* number of users waiting for brs buffers */
34 short afs_brsDaemons = 0; /* number of daemons waiting for brs requests */
35 struct brequest afs_brs[NBRS]; /* request structures */
36 struct afs_osi_WaitHandle AFS_WaitHandler, AFS_CSWaitHandler;
37 static int afs_brs_count = 0; /* request counter, to service reqs in order */
39 static int rxepoch_checked = 0;
40 #define afs_CheckRXEpoch() {if (rxepoch_checked == 0 && rxkad_EpochWasSet) { \
41 rxepoch_checked = 1; afs_GCUserData(/* force flag */ 1); } }
43 /* PAG garbage collection */
44 /* We induce a compile error if param.h does not define AFS_GCPAGS */
45 afs_int32 afs_gcpags = AFS_GCPAGS;
46 afs_int32 afs_gcpags_procsize = 0;
48 afs_int32 afs_CheckServerDaemonStarted = 0;
49 #ifndef DEFAULT_PROBE_INTERVAL
50 #define DEFAULT_PROBE_INTERVAL 180 /* default to 3 min */
52 afs_int32 afs_probe_interval = DEFAULT_PROBE_INTERVAL;
53 afs_int32 afs_probe_all_interval = 600;
55 #define PROBE_WAIT() (1000 * (afs_probe_interval - ((afs_random() & 0x7fffffff) \
56 % (afs_probe_interval/2))))
59 afs_CheckServerDaemon(void)
61 afs_int32 now, delay, lastCheck, last10MinCheck;
63 afs_CheckServerDaemonStarted = 1;
65 while (afs_initState < 101)
66 afs_osi_Sleep(&afs_initState);
67 afs_osi_Wait(PROBE_WAIT(), &AFS_CSWaitHandler, 0);
69 last10MinCheck = lastCheck = osi_Time();
71 if (afs_termState == AFSOP_STOP_CS) {
72 afs_termState = AFSOP_STOP_BKG;
73 afs_osi_Wakeup(&afs_termState);
78 if (afs_probe_interval + lastCheck <= now) {
79 afs_CheckServers(1, NULL); /* check down servers */
80 lastCheck = now = osi_Time();
83 if (afs_probe_all_interval + last10MinCheck <= now) {
84 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, afs_probe_all_interval);
85 afs_CheckServers(0, NULL);
86 last10MinCheck = now = osi_Time();
89 if (afs_termState == AFSOP_STOP_CS) {
90 afs_termState = AFSOP_STOP_BKG;
91 afs_osi_Wakeup(&afs_termState);
95 /* Compute time to next probe. */
96 delay = afs_probe_interval + lastCheck;
97 if (delay > afs_probe_all_interval + last10MinCheck)
98 delay = afs_probe_all_interval + last10MinCheck;
102 afs_osi_Wait(delay * 1000, &AFS_CSWaitHandler, 0);
104 afs_CheckServerDaemonStarted = 0;
106 #define RECURSIVE_VFS_CONTEXT 1
107 #if RECURSIVE_VFS_CONTEXT
108 extern int vfs_context_ref;
110 #define vfs_context_ref 1
116 struct afs_exporter *exporter;
118 afs_int32 last3MinCheck, last10MinCheck, last60MinCheck, lastNMinCheck;
119 afs_int32 last1MinCheck;
120 afs_uint32 lastCBSlotBump;
123 AFS_STATCNT(afs_Daemon);
124 last1MinCheck = last3MinCheck = last60MinCheck = last10MinCheck =
127 afs_rootFid.Fid.Volume = 0;
128 while (afs_initState < 101)
129 afs_osi_Sleep(&afs_initState);
131 #ifdef AFS_DARWIN80_ENV
132 if (afs_osi_ctxtp_initialized)
133 osi_Panic("vfs context already initialized");
134 while (afs_osi_ctxtp && vfs_context_ref)
135 afs_osi_Sleep(&afs_osi_ctxtp);
136 #if RECURSIVE_VFS_CONTEXT
137 if (afs_osi_ctxtp && !vfs_context_ref)
138 vfs_context_rele(afs_osi_ctxtp);
140 afs_osi_ctxtp = vfs_context_create(NULL);
141 afs_osi_ctxtp_initialized = 1;
144 lastCBSlotBump = now;
146 /* when a lot of clients are booted simultaneously, they develop
147 * annoying synchronous VL server bashing behaviors. So we stagger them.
149 last1MinCheck = now + ((afs_random() & 0x7fffffff) % 60); /* an extra 30 */
150 last3MinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
151 last60MinCheck = now - 1800 + ((afs_random() & 0x7fffffff) % 3600);
152 last10MinCheck = now - 300 + ((afs_random() & 0x7fffffff) % 600);
153 lastNMinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
155 /* start off with afs_initState >= 101 (basic init done) */
157 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
159 /* things to do every 20 seconds or less - required by protocol spec */
161 afs_FlushActiveVcaches(0); /* flush NFS writes */
162 afs_FlushVCBs(1); /* flush queued callbacks */
163 afs_MaybeWakeupTruncateDaemon(); /* free cache space if have too */
164 rx_CheckPackets(); /* Does RX need more packets? */
167 if (lastCBSlotBump + CBHTSLOTLEN < now) { /* pretty time-dependant */
168 lastCBSlotBump = now;
169 if (afs_BumpBase()) {
170 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
174 if (last1MinCheck + 60 < now) {
175 /* things to do every minute */
176 DFlush(); /* write out dir buffers */
177 afs_WriteThroughDSlots(); /* write through cacheinfo entries */
178 ObtainWriteLock(&afs_xvcache, 736);
179 afs_FlushReclaimedVcaches();
180 ReleaseWriteLock(&afs_xvcache);
181 afs_FlushActiveVcaches(1); /* keep flocks held & flush nfs writes */
182 #ifdef AFS_DISCON_ENV
183 afs_StoreDirtyVcaches();
189 if (last3MinCheck + 180 < now) {
190 afs_CheckTokenCache(); /* check for access cache resets due to expired
194 if (!afs_CheckServerDaemonStarted) {
195 /* Do the check here if the correct afsd is not installed. */
198 printf("Please install afsd with check server daemon.\n");
200 if (lastNMinCheck + afs_probe_interval < now) {
201 /* only check down servers */
202 afs_CheckServers(1, NULL);
206 if (last10MinCheck + 600 < now) {
207 #ifdef AFS_USERSPACE_IP_ADDR
208 extern int rxi_GetcbiInfo(void);
210 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, 600);
211 #ifdef AFS_USERSPACE_IP_ADDR
212 if (rxi_GetcbiInfo()) { /* addresses changed from last time */
215 #else /* AFS_USERSPACE_IP_ADDR */
216 if (rxi_GetIFInfo()) { /* addresses changed from last time */
219 #endif /* else AFS_USERSPACE_IP_ADDR */
220 if (!afs_CheckServerDaemonStarted)
221 afs_CheckServers(0, NULL);
222 afs_GCUserData(0); /* gc old conns */
223 /* This is probably the wrong way of doing GC for the various exporters but it will suffice for a while */
224 for (exporter = root_exported; exporter;
225 exporter = exporter->exp_next) {
226 (void)EXP_GC(exporter, 0); /* Generalize params */
231 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED |
235 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED |
240 last10MinCheck = now;
242 if (last60MinCheck + 3600 < now) {
243 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEVOLUME, ICL_TYPE_INT32,
245 afs_CheckRootVolume();
247 if (afs_gcpags == AFS_GCPAGS_OK) {
252 last60MinCheck = now;
254 if (afs_initState < 300) { /* while things ain't rosy */
255 code = afs_CheckRootVolume();
257 afs_initState = 300; /* succeeded */
258 if (afs_initState < 200)
259 afs_initState = 200; /* tried once */
260 afs_osi_Wakeup(&afs_initState);
263 /* 18285 is because we're trying to divide evenly into 128, that is,
264 * CBSlotLen, while staying just under 20 seconds. If CBSlotLen
265 * changes, should probably change this interval, too.
266 * Some of the preceding actions may take quite some time, so we
267 * might not want to wait the entire interval */
268 now = 18285 - (osi_Time() - now);
270 afs_osi_Wait(now, &AFS_WaitHandler, 0);
273 if (afs_termState == AFSOP_STOP_AFS) {
274 if (afs_CheckServerDaemonStarted)
275 afs_termState = AFSOP_STOP_CS;
277 afs_termState = AFSOP_STOP_BKG;
278 afs_osi_Wakeup(&afs_termState);
285 afs_CheckRootVolume(void)
287 char rootVolName[32];
288 struct volume *tvp = NULL;
289 int usingDynroot = afs_GetDynrootEnable();
292 AFS_STATCNT(afs_CheckRootVolume);
293 if (*afs_rootVolumeName == 0) {
294 strcpy(rootVolName, "root.afs");
296 strcpy(rootVolName, afs_rootVolumeName);
300 afs_GetDynrootFid(&afs_rootFid);
301 tvp = afs_GetVolume(&afs_rootFid, NULL, READ_LOCK);
303 struct cell *lc = afs_GetPrimaryCell(READ_LOCK);
307 localcell = lc->cellNum;
308 afs_PutCell(lc, READ_LOCK);
309 tvp = afs_GetVolumeByName(rootVolName, localcell, 1, NULL, READ_LOCK);
312 int len = strlen(rootVolName);
314 if ((len < 9) || strcmp(&rootVolName[len - 9], ".readonly")) {
315 strcpy(buf, rootVolName);
316 afs_strcat(buf, ".readonly");
317 tvp = afs_GetVolumeByName(buf, localcell, 1, NULL, READ_LOCK);
321 int volid = (tvp->roVol ? tvp->roVol : tvp->volume);
322 afs_rootFid.Cell = localcell;
323 if (afs_rootFid.Fid.Volume && afs_rootFid.Fid.Volume != volid
325 struct vcache *tvc = afs_globalVp;
326 /* If we had a root fid before and it changed location we reset
327 * the afs_globalVp so that it will be reevaluated.
328 * Just decrement the reference count. This only occurs during
329 * initial cell setup and can panic the machine if we set the
330 * count to zero and fs checkv is executed when the current
333 #ifdef AFS_LINUX20_ENV
335 struct vrequest treq;
341 afs_rootFid.Fid.Volume = volid;
342 afs_rootFid.Fid.Vnode = 1;
343 afs_rootFid.Fid.Unique = 1;
346 if (afs_InitReq(&treq, credp))
348 vcp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
351 afs_getattr(vcp, &vattr, credp);
352 afs_fill_inode(AFSTOV(vcp), &vattr);
354 dp = d_find_alias(AFSTOV(afs_globalVp));
356 #if defined(AFS_LINUX24_ENV)
357 spin_lock(&dcache_lock);
358 #if defined(AFS_LINUX26_ENV)
359 spin_lock(&dp->d_lock);
362 list_del_init(&dp->d_alias);
363 list_add(&dp->d_alias, &(AFSTOV(vcp)->i_dentry));
364 dp->d_inode = AFSTOV(vcp);
365 #if defined(AFS_LINUX24_ENV)
366 #if defined(AFS_LINUX26_ENV)
367 spin_unlock(&dp->d_lock);
369 spin_unlock(&dcache_lock);
373 AFS_FAST_RELE(afs_globalVp);
379 #ifdef AFS_DARWIN80_ENV
380 afs_PutVCache(afs_globalVp);
382 AFS_FAST_RELE(afs_globalVp);
387 afs_rootFid.Fid.Volume = volid;
388 afs_rootFid.Fid.Vnode = 1;
389 afs_rootFid.Fid.Unique = 1;
393 afs_initState = 300; /* won */
394 afs_osi_Wakeup(&afs_initState);
395 afs_PutVolume(tvp, READ_LOCK);
397 if (afs_rootFid.Fid.Volume)
403 /* ptr_parm 0 is the pathname, size_parm 0 to the fetch is the chunk number */
405 BPath(register struct brequest *ab)
407 register struct dcache *tdc = NULL;
408 struct vcache *tvc = NULL;
409 struct vnode *tvn = NULL;
410 #ifdef AFS_LINUX22_ENV
411 struct dentry *dp = NULL;
413 afs_size_t offset, len;
414 struct vrequest treq;
418 if ((code = afs_InitReq(&treq, ab->cred)))
421 #ifdef AFS_LINUX22_ENV
422 code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &dp);
424 tvn = (struct vnode *)dp->d_inode;
426 code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &tvn);
429 osi_FreeLargeSpace((char *)ab->ptr_parm[0]); /* free path name buffer here */
432 /* now path may not have been in afs, so check that before calling our cache manager */
433 if (!tvn || !IsAfsVnode(tvn)) {
434 /* release it and give up */
436 #ifdef AFS_LINUX22_ENV
445 /* here we know its an afs vnode, so we can get the data for the chunk */
446 tdc = afs_GetDCache(tvc, ab->size_parm[0], &treq, &offset, &len, 1);
450 #ifdef AFS_LINUX22_ENV
457 /* size_parm 0 to the fetch is the chunk number,
458 * ptr_parm 0 is the dcache entry to wakeup,
459 * size_parm 1 is true iff we should release the dcache entry here.
462 BPrefetch(register struct brequest *ab)
464 register struct dcache *tdc;
465 register struct vcache *tvc;
466 afs_size_t offset, len;
467 struct vrequest treq;
469 AFS_STATCNT(BPrefetch);
470 if ((len = afs_InitReq(&treq, ab->cred)))
473 tdc = afs_GetDCache(tvc, ab->size_parm[0], &treq, &offset, &len, 1);
477 /* now, dude may be waiting for us to clear DFFetchReq bit; do so. Can't
478 * use tdc from GetDCache since afs_GetDCache may fail, but someone may
479 * be waiting for our wakeup anyway.
481 tdc = (struct dcache *)(ab->ptr_parm[0]);
482 ObtainSharedLock(&tdc->lock, 640);
483 if (tdc->mflags & DFFetchReq) {
484 UpgradeSToWLock(&tdc->lock, 641);
485 tdc->mflags &= ~DFFetchReq;
486 ReleaseWriteLock(&tdc->lock);
488 ReleaseSharedLock(&tdc->lock);
490 afs_osi_Wakeup(&tdc->validPos);
491 if (ab->size_parm[1]) {
492 afs_PutDCache(tdc); /* put this one back, too */
498 BStore(register struct brequest *ab)
500 register struct vcache *tvc;
501 register afs_int32 code;
502 struct vrequest treq;
503 #if defined(AFS_SGI_ENV)
504 struct cred *tmpcred;
508 if ((code = afs_InitReq(&treq, ab->cred)))
512 #if defined(AFS_SGI_ENV)
514 * Since StoreOnLastReference can end up calling osi_SyncVM which
515 * calls into VM code that assumes that u.u_cred has the
516 * correct credentials, we set our to theirs for this xaction
518 tmpcred = OSI_GET_CURRENT_CRED();
519 OSI_SET_CURRENT_CRED(ab->cred);
522 * To avoid recursion since the WriteLock may be released during VM
523 * operations, we hold the VOP_RWLOCK across this transaction as
524 * do the other callers of StoreOnLastReference
526 AFS_RWLOCK((vnode_t *) tvc, 1);
528 ObtainWriteLock(&tvc->lock, 209);
529 code = afs_StoreOnLastReference(tvc, &treq);
530 ReleaseWriteLock(&tvc->lock);
531 #if defined(AFS_SGI_ENV)
532 OSI_SET_CURRENT_CRED(tmpcred);
533 AFS_RWUNLOCK((vnode_t *) tvc, 1);
535 /* now set final return code, and wakeup anyone waiting */
536 if ((ab->flags & BUVALID) == 0) {
537 ab->code = afs_CheckCode(code, &treq, 43); /* set final code, since treq doesn't go across processes */
538 ab->flags |= BUVALID;
539 if (ab->flags & BUWAIT) {
540 ab->flags &= ~BUWAIT;
546 /* release a held request buffer */
548 afs_BRelease(register struct brequest *ab)
551 AFS_STATCNT(afs_BRelease);
552 MObtainWriteLock(&afs_xbrs, 294);
553 if (--ab->refCount <= 0) {
557 afs_osi_Wakeup(&afs_brsWaiters);
558 MReleaseWriteLock(&afs_xbrs);
561 /* return true if bkg fetch daemons are all busy */
565 AFS_STATCNT(afs_BBusy);
566 if (afs_brsDaemons > 0)
572 afs_BQueue(register short aopcode, register struct vcache *avc,
573 afs_int32 dontwait, afs_int32 ause, struct AFS_UCRED *acred,
574 afs_size_t asparm0, afs_size_t asparm1, void *apparm0)
577 register struct brequest *tb;
579 AFS_STATCNT(afs_BQueue);
580 MObtainWriteLock(&afs_xbrs, 296);
583 for (i = 0; i < NBRS; i++, tb++) {
584 if (tb->refCount == 0)
589 tb->opcode = aopcode;
594 VN_HOLD(AFSTOV(avc));
596 tb->refCount = ause + 1;
597 tb->size_parm[0] = asparm0;
598 tb->size_parm[1] = asparm1;
599 tb->ptr_parm[0] = apparm0;
602 tb->ts = afs_brs_count++;
603 /* if daemons are waiting for work, wake them up */
604 if (afs_brsDaemons > 0) {
605 afs_osi_Wakeup(&afs_brsDaemons);
607 MReleaseWriteLock(&afs_xbrs);
611 MReleaseWriteLock(&afs_xbrs);
614 /* no free buffers, sleep a while */
616 MReleaseWriteLock(&afs_xbrs);
617 afs_osi_Sleep(&afs_brsWaiters);
618 MObtainWriteLock(&afs_xbrs, 301);
624 /* AIX 4.1 has a much different sleep/wakeup mechanism available for use.
625 * The modifications here will work for either a UP or MP machine.
627 struct buf *afs_asyncbuf = (struct buf *)0;
628 tid_t afs_asyncbuf_cv = EVENT_NULL;
629 afs_int32 afs_biodcnt = 0;
631 /* in implementing this, I assumed that all external linked lists were
634 * Several places in this code traverse a linked list. The algorithm
635 * used here is probably unfamiliar to most people. Careful examination
636 * will show that it eliminates an assignment inside the loop, as compared
637 * to the standard algorithm, at the cost of occasionally using an extra
643 * This function obtains, and returns, a pointer to a buffer for
644 * processing by a daemon. It sleeps until such a buffer is available.
645 * The source of buffers for it is the list afs_asyncbuf (see also
646 * afs_gn_strategy). This function may be invoked concurrently by
647 * several processes, that is, several instances of the same daemon.
648 * afs_gn_strategy, which adds buffers to the list, runs at interrupt
649 * level, while get_bioreq runs at process level.
651 * Since AIX 4.1 can wake just one process at a time, the separate sleep
652 * addresses have been removed.
653 * Note that the kernel_lock is held until the e_sleep_thread() occurs.
654 * The afs_asyncbuf_lock is primarily used to serialize access between
655 * process and interrupts.
657 Simple_lock afs_asyncbuf_lock;
661 struct buf *bp = NULL;
663 struct buf **bestlbpP, **lbpP;
665 struct buf *t1P, *t2P; /* temp pointers for list manipulation */
668 struct afs_bioqueue *s;
670 /* ??? Does the forward pointer of the returned buffer need to be NULL?
673 /* Disable interrupts from the strategy function, and save the
674 * prior priority level and lock access to the afs_asyncbuf.
677 oldPriority = disable_lock(INTMAX, &afs_asyncbuf_lock);
681 /* look for oldest buffer */
682 bp = bestbp = afs_asyncbuf;
683 bestage = (long)bestbp->av_back;
684 bestlbpP = &afs_asyncbuf;
690 if ((long)bp->av_back - bestage < 0) {
693 bestage = (long)bp->av_back;
697 *bestlbpP = bp->av_forw;
700 /* If afs_asyncbuf is null, it is necessary to go to sleep.
701 * e_wakeup_one() ensures that only one thread wakes.
704 /* The LOCK_HANDLER indicates to e_sleep_thread to only drop the
705 * lock on an MP machine.
708 e_sleep_thread(&afs_asyncbuf_cv, &afs_asyncbuf_lock,
709 LOCK_HANDLER | INTERRUPTIBLE);
710 if (interrupted == THREAD_INTERRUPTED) {
711 /* re-enable interrupts from strategy */
712 unlock_enable(oldPriority, &afs_asyncbuf_lock);
716 } /* end of "else asyncbuf is empty" */
717 } /* end of "inner loop" */
721 unlock_enable(oldPriority, &afs_asyncbuf_lock);
724 /* For the convenience of other code, replace the gnodes in
725 * the b_vp field of bp and the other buffers on the b_work
726 * chain with the corresponding vnodes.
728 * ??? what happens to the gnodes? They're not just cut loose,
732 t2P = (struct buf *)t1P->b_work;
733 t1P->b_vp = ((struct gnode *)t1P->b_vp)->gn_vnode;
737 t1P = (struct buf *)t2P->b_work;
738 t2P->b_vp = ((struct gnode *)t2P->b_vp)->gn_vnode;
743 /* If the buffer does not specify I/O, it may immediately
744 * be returned to the caller. This condition is detected
745 * by examining the buffer's flags (the b_flags field). If
746 * the B_PFPROT bit is set, the buffer represents a protection
747 * violation, rather than a request for I/O. The remainder
748 * of the outer loop handles the case where the B_PFPROT bit is clear.
750 if (bp->b_flags & B_PFPROT) {
755 } /* end of function get_bioreq() */
760 * This function is the daemon. It is called from the syscall
761 * interface. Ordinarily, a script or an administrator will run a
762 * daemon startup utility, specifying the number of I/O daemons to
763 * run. The utility will fork off that number of processes,
764 * each making the appropriate syscall, which will cause this
765 * function to be invoked.
767 static int afs_initbiod = 0; /* this is self-initializing code */
770 afs_BioDaemon(afs_int32 nbiods)
772 afs_int32 code, s, pflg = 0;
774 struct buf *bp, *bp1, *tbp1, *tbp2; /* temp pointers only */
782 /* pin lock, since we'll be using it in an interrupt. */
783 lock_alloc(&afs_asyncbuf_lock, LOCK_ALLOC_PIN, 2, 1);
784 simple_lock_init(&afs_asyncbuf_lock);
785 pin(&afs_asyncbuf, sizeof(struct buf *));
786 pin(&afs_asyncbuf_cv, sizeof(afs_int32));
789 /* Ignore HUP signals... */
791 sigset_t sigbits, osigbits;
793 * add SIGHUP to the set of already masked signals
795 SIGFILLSET(sigbits); /* allow all signals */
796 SIGDELSET(sigbits, SIGHUP); /* except SIGHUP */
797 limit_sigs(&sigbits, &osigbits); /* and already masked */
799 /* Main body starts here -- this is an intentional infinite loop, and
802 * Now, the loop will exit if get_bioreq() returns NULL, indicating
803 * that we've been interrupted.
806 bp = afs_get_bioreq();
808 break; /* we were interrupted */
809 if (code = setjmpx(&jmpbuf)) {
810 /* This should not have happend, maybe a lack of resources */
812 s = disable_lock(INTMAX, &afs_asyncbuf_lock);
813 for (bp1 = bp; bp; bp = bp1) {
815 bp1 = (struct buf *)bp1->b_work;
818 bp->b_flags |= B_ERROR;
821 unlock_enable(s, &afs_asyncbuf_lock);
825 vcp = VTOAFS(bp->b_vp);
826 if (bp->b_flags & B_PFSTORE) { /* XXXX */
827 ObtainWriteLock(&vcp->lock, 404);
828 if (vcp->v.v_gnode->gn_mwrcnt) {
829 afs_offs_t newlength =
830 (afs_offs_t) dbtob(bp->b_blkno) + bp->b_bcount;
831 if (vcp->m.Length < newlength) {
832 afs_Trace4(afs_iclSetp, CM_TRACE_SETLENGTH,
833 ICL_TYPE_STRING, __FILE__, ICL_TYPE_LONG,
834 __LINE__, ICL_TYPE_OFFSET,
835 ICL_HANDLE_OFFSET(vcp->m.Length),
836 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(newlength));
837 vcp->m.Length = newlength;
840 ReleaseWriteLock(&vcp->lock);
842 /* If the buffer represents a protection violation, rather than
843 * an actual request for I/O, no special action need be taken.
845 if (bp->b_flags & B_PFPROT) {
846 iodone(bp); /* Notify all users of the buffer that we're done */
851 ObtainWriteLock(&vcp->pvmlock, 211);
853 * First map its data area to a region in the current address space
854 * by calling vm_att with the subspace identifier, and a pointer to
855 * the data area. vm_att returns a new data area pointer, but we
856 * also want to hang onto the old one.
858 tmpaddr = bp->b_baddr;
859 bp->b_baddr = (caddr_t) vm_att(bp->b_xmemd.subspace_id, tmpaddr);
860 tmperr = afs_ustrategy(bp); /* temp variable saves offset calculation */
861 if (tmperr) { /* in non-error case */
862 bp->b_flags |= B_ERROR; /* should other flags remain set ??? */
863 bp->b_error = tmperr;
866 /* Unmap the buffer's data area by calling vm_det. Reset data area
867 * to the value that we saved above.
870 bp->b_baddr = tmpaddr;
873 * buffer may be linked with other buffers via the b_work field.
874 * See also afs_gn_strategy. For each buffer in the chain (including
875 * bp) notify all users of the buffer that the daemon is finished
876 * using it by calling iodone.
877 * assumes iodone can modify the b_work field.
880 tbp2 = (struct buf *)tbp1->b_work;
885 tbp1 = (struct buf *)tbp2->b_work;
891 ReleaseWriteLock(&vcp->pvmlock); /* Unlock the vnode. */
893 } /* infinite loop (unless we're interrupted) */
894 } /* end of afs_BioDaemon() */
896 #endif /* AFS_AIX41_ENV */
901 afs_BackgroundDaemon(void)
906 AFS_STATCNT(afs_BackgroundDaemon);
907 /* initialize subsystem */
909 LOCK_INIT(&afs_xbrs, "afs_xbrs");
910 memset((char *)afs_brs, 0, sizeof(afs_brs));
912 #if defined (AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
914 * steal the first daemon for doing delayed DSlot flushing
915 * (see afs_GetDownDSlot)
924 MObtainWriteLock(&afs_xbrs, 302);
927 struct brequest *min_tb = NULL;
929 if (afs_termState == AFSOP_STOP_BKG) {
931 afs_termState = AFSOP_STOP_TRUNCDAEMON;
932 MReleaseWriteLock(&afs_xbrs);
933 afs_osi_Wakeup(&afs_termState);
940 for (i = 0; i < NBRS; i++, tb++) {
941 /* look for request with smallest ts */
942 if ((tb->refCount > 0) && !(tb->flags & BSTARTED)) {
943 /* new request, not yet picked up */
944 if ((min_tb && (min_ts - tb->ts > 0)) || !min_tb) {
951 /* claim and process this request */
952 tb->flags |= BSTARTED;
953 MReleaseWriteLock(&afs_xbrs);
955 afs_Trace1(afs_iclSetp, CM_TRACE_BKG1, ICL_TYPE_INT32,
957 if (tb->opcode == BOP_FETCH)
959 else if (tb->opcode == BOP_STORE)
961 else if (tb->opcode == BOP_PATH)
964 panic("background bop");
966 AFS_RELE(AFSTOV(tb->vc)); /* MUST call vnode layer or could lose vnodes */
971 tb->cred = (struct AFS_UCRED *)0;
973 afs_BRelease(tb); /* this grabs and releases afs_xbrs lock */
974 MObtainWriteLock(&afs_xbrs, 305);
977 /* wait for new request */
979 MReleaseWriteLock(&afs_xbrs);
980 afs_osi_Sleep(&afs_brsDaemons);
981 MObtainWriteLock(&afs_xbrs, 307);
989 shutdown_daemons(void)
991 AFS_STATCNT(shutdown_daemons);
992 if (afs_cold_shutdown) {
993 afs_brsDaemons = brsInit = 0;
994 rxepoch_checked = afs_nbrs = 0;
995 memset((char *)afs_brs, 0, sizeof(afs_brs));
996 memset((char *)&afs_xbrs, 0, sizeof(afs_lock_t));
999 lock_free(&afs_asyncbuf_lock);
1000 unpin(&afs_asyncbuf, sizeof(struct buf *));
1001 unpin(&afs_asyncbuf_cv, sizeof(afs_int32));
1007 #if defined(AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
1009 * sgi - daemon - handles certain operations that otherwise
1010 * would use up too much kernel stack space
1012 * This all assumes that since the caller must have the xdcache lock
1013 * exclusively that the list will never be more than one long
1014 * and noone else can attempt to add anything until we're done.
1016 SV_TYPE afs_sgibksync;
1017 SV_TYPE afs_sgibkwait;
1018 lock_t afs_sgibklock;
1019 struct dcache *afs_sgibklist;
1027 if (afs_sgibklock == NULL) {
1028 SV_INIT(&afs_sgibksync, "bksync", 0, 0);
1029 SV_INIT(&afs_sgibkwait, "bkwait", 0, 0);
1030 SPINLOCK_INIT(&afs_sgibklock, "bklock");
1032 s = SPLOCK(afs_sgibklock);
1034 /* wait for something to do */
1035 SP_WAIT(afs_sgibklock, s, &afs_sgibksync, PINOD);
1036 osi_Assert(afs_sgibklist);
1038 /* XX will probably need to generalize to real list someday */
1039 s = SPLOCK(afs_sgibklock);
1040 while (afs_sgibklist) {
1041 tdc = afs_sgibklist;
1042 afs_sgibklist = NULL;
1043 SPUNLOCK(afs_sgibklock, s);
1045 tdc->dflags &= ~DFEntryMod;
1046 afs_WriteDCache(tdc, 1);
1048 s = SPLOCK(afs_sgibklock);
1051 /* done all the work - wake everyone up */
1052 while (SV_SIGNAL(&afs_sgibkwait));