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 30 /* default to 3 min */
52 afs_int32 afs_probe_interval = DEFAULT_PROBE_INTERVAL;
53 afs_int32 afs_probe_all_interval = 600;
54 afs_int32 afs_nat_probe_interval = 60;
55 afs_int32 afs_preCache = 0;
57 #define PROBE_WAIT() (1000 * (afs_probe_interval - ((afs_random() & 0x7fffffff) \
58 % (afs_probe_interval/2))))
61 afs_SetCheckServerNATmode(int isnat)
63 static afs_int32 old_intvl, old_all_intvl;
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;
80 afs_CheckServerDaemon(void)
82 afs_int32 now, delay, lastCheck, last10MinCheck;
84 afs_CheckServerDaemonStarted = 1;
86 while (afs_initState < 101)
87 afs_osi_Sleep(&afs_initState);
88 afs_osi_Wait(PROBE_WAIT(), &AFS_CSWaitHandler, 0);
90 last10MinCheck = lastCheck = osi_Time();
92 if (afs_termState == AFSOP_STOP_CS) {
93 afs_termState = AFSOP_STOP_BKG;
94 afs_osi_Wakeup(&afs_termState);
99 if (afs_probe_interval + lastCheck <= now) {
100 afs_CheckServers(1, NULL); /* check down servers */
101 lastCheck = now = osi_Time();
104 if (afs_probe_all_interval + last10MinCheck <= now) {
105 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, afs_probe_all_interval);
106 afs_CheckServers(0, NULL);
107 last10MinCheck = now = osi_Time();
109 /* shutdown check. */
110 if (afs_termState == AFSOP_STOP_CS) {
111 afs_termState = AFSOP_STOP_BKG;
112 afs_osi_Wakeup(&afs_termState);
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;
123 afs_osi_Wait(delay * 1000, &AFS_CSWaitHandler, 0);
125 afs_CheckServerDaemonStarted = 0;
128 extern int vfs_context_ref;
134 struct afs_exporter *exporter;
136 afs_int32 last3MinCheck, last10MinCheck, last60MinCheck, lastNMinCheck;
137 afs_int32 last1MinCheck;
138 afs_uint32 lastCBSlotBump;
141 AFS_STATCNT(afs_Daemon);
142 last1MinCheck = last3MinCheck = last60MinCheck = last10MinCheck =
145 afs_rootFid.Fid.Volume = 0;
146 while (afs_initState < 101)
147 afs_osi_Sleep(&afs_initState);
149 #ifdef AFS_DARWIN80_ENV
150 if (afs_osi_ctxtp_initialized)
151 osi_Panic("vfs context already initialized");
152 while (afs_osi_ctxtp && vfs_context_ref)
153 afs_osi_Sleep(&afs_osi_ctxtp);
154 if (afs_osi_ctxtp && !vfs_context_ref)
155 vfs_context_rele(afs_osi_ctxtp);
156 afs_osi_ctxtp = vfs_context_create(NULL);
157 afs_osi_ctxtp_initialized = 1;
160 lastCBSlotBump = now;
162 /* when a lot of clients are booted simultaneously, they develop
163 * annoying synchronous VL server bashing behaviors. So we stagger them.
165 last1MinCheck = now + ((afs_random() & 0x7fffffff) % 60); /* an extra 30 */
166 last3MinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
167 last60MinCheck = now - 1800 + ((afs_random() & 0x7fffffff) % 3600);
168 last10MinCheck = now - 300 + ((afs_random() & 0x7fffffff) % 600);
169 lastNMinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
171 /* start off with afs_initState >= 101 (basic init done) */
173 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
175 /* things to do every 20 seconds or less - required by protocol spec */
177 afs_FlushActiveVcaches(0); /* flush NFS writes */
178 afs_FlushVCBs(1); /* flush queued callbacks */
179 afs_MaybeWakeupTruncateDaemon(); /* free cache space if have too */
180 rx_CheckPackets(); /* Does RX need more packets? */
183 if (lastCBSlotBump + CBHTSLOTLEN < now) { /* pretty time-dependant */
184 lastCBSlotBump = now;
185 if (afs_BumpBase()) {
186 afs_CheckCallbacks(20); /* unstat anything which will expire soon */
190 if (last1MinCheck + 60 < now) {
191 /* things to do every minute */
192 DFlush(); /* write out dir buffers */
193 afs_WriteThroughDSlots(); /* write through cacheinfo entries */
194 ObtainWriteLock(&afs_xvcache, 736);
195 afs_FlushReclaimedVcaches();
196 ReleaseWriteLock(&afs_xvcache);
197 afs_FlushActiveVcaches(1); /* keep flocks held & flush nfs writes */
199 #ifdef AFS_DISCON_ENV
200 afs_StoreDirtyVcaches();
207 if (last3MinCheck + 180 < now) {
208 afs_CheckTokenCache(); /* check for access cache resets due to expired
212 if (!afs_CheckServerDaemonStarted) {
213 /* Do the check here if the correct afsd is not installed. */
216 printf("Please install afsd with check server daemon.\n");
218 if (lastNMinCheck + afs_probe_interval < now) {
219 /* only check down servers */
220 afs_CheckServers(1, NULL);
224 if (last10MinCheck + 600 < now) {
225 #ifdef AFS_USERSPACE_IP_ADDR
226 extern int rxi_GetcbiInfo(void);
228 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, 600);
229 #ifdef AFS_USERSPACE_IP_ADDR
230 if (rxi_GetcbiInfo()) { /* addresses changed from last time */
233 #else /* AFS_USERSPACE_IP_ADDR */
234 if (rxi_GetIFInfo()) { /* addresses changed from last time */
237 #endif /* else AFS_USERSPACE_IP_ADDR */
238 if (!afs_CheckServerDaemonStarted)
239 afs_CheckServers(0, NULL);
240 afs_GCUserData(0); /* gc old conns */
241 /* This is probably the wrong way of doing GC for the various exporters but it will suffice for a while */
242 for (exporter = root_exported; exporter;
243 exporter = exporter->exp_next) {
244 (void)EXP_GC(exporter, 0); /* Generalize params */
249 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED |
253 afs_CheckVolumeNames(AFS_VOLCHECK_EXPIRED |
258 last10MinCheck = now;
260 if (last60MinCheck + 3600 < now) {
261 afs_Trace1(afs_iclSetp, CM_TRACE_PROBEVOLUME, ICL_TYPE_INT32,
263 afs_CheckRootVolume();
265 if (afs_gcpags == AFS_GCPAGS_OK) {
270 last60MinCheck = now;
272 if (afs_initState < 300) { /* while things ain't rosy */
273 code = afs_CheckRootVolume();
275 afs_initState = 300; /* succeeded */
276 if (afs_initState < 200)
277 afs_initState = 200; /* tried once */
278 afs_osi_Wakeup(&afs_initState);
281 /* 18285 is because we're trying to divide evenly into 128, that is,
282 * CBSlotLen, while staying just under 20 seconds. If CBSlotLen
283 * changes, should probably change this interval, too.
284 * Some of the preceding actions may take quite some time, so we
285 * might not want to wait the entire interval */
286 now = 18285 - (osi_Time() - now);
288 afs_osi_Wait(now, &AFS_WaitHandler, 0);
291 if (afs_termState == AFSOP_STOP_AFS) {
292 if (afs_CheckServerDaemonStarted)
293 afs_termState = AFSOP_STOP_CS;
295 afs_termState = AFSOP_STOP_BKG;
296 afs_osi_Wakeup(&afs_termState);
303 afs_CheckRootVolume(void)
305 char rootVolName[32];
306 struct volume *tvp = NULL;
307 int usingDynroot = afs_GetDynrootEnable();
310 AFS_STATCNT(afs_CheckRootVolume);
311 if (*afs_rootVolumeName == 0) {
312 strcpy(rootVolName, "root.afs");
314 strcpy(rootVolName, afs_rootVolumeName);
318 afs_GetDynrootFid(&afs_rootFid);
319 tvp = afs_GetVolume(&afs_rootFid, NULL, READ_LOCK);
321 struct cell *lc = afs_GetPrimaryCell(READ_LOCK);
325 localcell = lc->cellNum;
326 afs_PutCell(lc, READ_LOCK);
327 tvp = afs_GetVolumeByName(rootVolName, localcell, 1, NULL, READ_LOCK);
330 int len = strlen(rootVolName);
332 if ((len < 9) || strcmp(&rootVolName[len - 9], ".readonly")) {
333 strcpy(buf, rootVolName);
334 afs_strcat(buf, ".readonly");
335 tvp = afs_GetVolumeByName(buf, localcell, 1, NULL, READ_LOCK);
339 int volid = (tvp->roVol ? tvp->roVol : tvp->volume);
340 afs_rootFid.Cell = localcell;
341 if (afs_rootFid.Fid.Volume && afs_rootFid.Fid.Volume != volid
343 struct vcache *tvc = afs_globalVp;
344 /* If we had a root fid before and it changed location we reset
345 * the afs_globalVp so that it will be reevaluated.
346 * Just decrement the reference count. This only occurs during
347 * initial cell setup and can panic the machine if we set the
348 * count to zero and fs checkv is executed when the current
351 #ifdef AFS_LINUX20_ENV
353 struct vrequest treq;
359 afs_rootFid.Fid.Volume = volid;
360 afs_rootFid.Fid.Vnode = 1;
361 afs_rootFid.Fid.Unique = 1;
364 if (afs_InitReq(&treq, credp))
366 vcp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
369 afs_getattr(vcp, &vattr, credp);
370 afs_fill_inode(AFSTOV(vcp), &vattr);
372 dp = d_find_alias(AFSTOV(afs_globalVp));
374 #if defined(AFS_LINUX24_ENV)
375 spin_lock(&dcache_lock);
376 #if defined(AFS_LINUX26_ENV)
377 spin_lock(&dp->d_lock);
380 list_del_init(&dp->d_alias);
381 list_add(&dp->d_alias, &(AFSTOV(vcp)->i_dentry));
382 dp->d_inode = AFSTOV(vcp);
383 #if defined(AFS_LINUX24_ENV)
384 #if defined(AFS_LINUX26_ENV)
385 spin_unlock(&dp->d_lock);
387 spin_unlock(&dcache_lock);
391 AFS_FAST_RELE(afs_globalVp);
397 #ifdef AFS_DARWIN80_ENV
398 afs_PutVCache(afs_globalVp);
400 AFS_FAST_RELE(afs_globalVp);
405 afs_rootFid.Fid.Volume = volid;
406 afs_rootFid.Fid.Vnode = 1;
407 afs_rootFid.Fid.Unique = 1;
411 afs_initState = 300; /* won */
412 afs_osi_Wakeup(&afs_initState);
413 afs_PutVolume(tvp, READ_LOCK);
415 if (afs_rootFid.Fid.Volume)
421 /* ptr_parm 0 is the pathname, size_parm 0 to the fetch is the chunk number */
423 BPath(register struct brequest *ab)
425 register struct dcache *tdc = NULL;
426 struct vcache *tvc = NULL;
427 struct vnode *tvn = NULL;
428 #ifdef AFS_LINUX22_ENV
429 struct dentry *dp = NULL;
431 afs_size_t offset, len;
432 struct vrequest treq;
436 if ((code = afs_InitReq(&treq, ab->cred)))
439 #ifdef AFS_LINUX22_ENV
440 code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &dp);
442 tvn = (struct vnode *)dp->d_inode;
444 code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &tvn);
447 osi_FreeLargeSpace((char *)ab->ptr_parm[0]); /* free path name buffer here */
450 /* now path may not have been in afs, so check that before calling our cache manager */
451 if (!tvn || !IsAfsVnode(tvn)) {
452 /* release it and give up */
454 #ifdef AFS_LINUX22_ENV
463 /* here we know its an afs vnode, so we can get the data for the chunk */
464 tdc = afs_GetDCache(tvc, ab->size_parm[0], &treq, &offset, &len, 1);
468 #ifdef AFS_LINUX22_ENV
475 /* size_parm 0 to the fetch is the chunk number,
476 * ptr_parm 0 is the dcache entry to wakeup,
477 * size_parm 1 is true iff we should release the dcache entry here.
480 BPrefetch(register struct brequest *ab)
482 register struct dcache *tdc;
483 register struct vcache *tvc;
484 afs_size_t offset, len, abyte, totallen = 0;
485 struct vrequest treq;
487 AFS_STATCNT(BPrefetch);
488 if ((len = afs_InitReq(&treq, ab->cred)))
490 abyte = ab->size_parm[0];
493 tdc = afs_GetDCache(tvc, abyte, &treq, &offset, &len, 1);
499 } while ((totallen < afs_preCache) && tdc && (len > 0));
500 /* now, dude may be waiting for us to clear DFFetchReq bit; do so. Can't
501 * use tdc from GetDCache since afs_GetDCache may fail, but someone may
502 * be waiting for our wakeup anyway.
504 tdc = (struct dcache *)(ab->ptr_parm[0]);
505 ObtainSharedLock(&tdc->lock, 640);
506 if (tdc->mflags & DFFetchReq) {
507 UpgradeSToWLock(&tdc->lock, 641);
508 tdc->mflags &= ~DFFetchReq;
509 ReleaseWriteLock(&tdc->lock);
511 ReleaseSharedLock(&tdc->lock);
513 afs_osi_Wakeup(&tdc->validPos);
514 if (ab->size_parm[1]) {
515 afs_PutDCache(tdc); /* put this one back, too */
521 BStore(register struct brequest *ab)
523 register struct vcache *tvc;
524 register afs_int32 code;
525 struct vrequest treq;
526 #if defined(AFS_SGI_ENV)
527 struct cred *tmpcred;
531 if ((code = afs_InitReq(&treq, ab->cred)))
535 #if defined(AFS_SGI_ENV)
537 * Since StoreOnLastReference can end up calling osi_SyncVM which
538 * calls into VM code that assumes that u.u_cred has the
539 * correct credentials, we set our to theirs for this xaction
541 tmpcred = OSI_GET_CURRENT_CRED();
542 OSI_SET_CURRENT_CRED(ab->cred);
545 * To avoid recursion since the WriteLock may be released during VM
546 * operations, we hold the VOP_RWLOCK across this transaction as
547 * do the other callers of StoreOnLastReference
549 AFS_RWLOCK((vnode_t *) tvc, 1);
551 ObtainWriteLock(&tvc->lock, 209);
552 code = afs_StoreOnLastReference(tvc, &treq);
553 ReleaseWriteLock(&tvc->lock);
554 #if defined(AFS_SGI_ENV)
555 OSI_SET_CURRENT_CRED(tmpcred);
556 AFS_RWUNLOCK((vnode_t *) tvc, 1);
558 /* now set final return code, and wakeup anyone waiting */
559 if ((ab->flags & BUVALID) == 0) {
560 ab->code = afs_CheckCode(code, &treq, 43); /* set final code, since treq doesn't go across processes */
561 ab->flags |= BUVALID;
562 if (ab->flags & BUWAIT) {
563 ab->flags &= ~BUWAIT;
569 /* release a held request buffer */
571 afs_BRelease(register struct brequest *ab)
574 AFS_STATCNT(afs_BRelease);
575 MObtainWriteLock(&afs_xbrs, 294);
576 if (--ab->refCount <= 0) {
580 afs_osi_Wakeup(&afs_brsWaiters);
581 MReleaseWriteLock(&afs_xbrs);
584 /* return true if bkg fetch daemons are all busy */
588 AFS_STATCNT(afs_BBusy);
589 if (afs_brsDaemons > 0)
595 afs_BQueue(register short aopcode, register struct vcache *avc,
596 afs_int32 dontwait, afs_int32 ause, struct AFS_UCRED *acred,
597 afs_size_t asparm0, afs_size_t asparm1, void *apparm0)
600 register struct brequest *tb;
602 AFS_STATCNT(afs_BQueue);
603 MObtainWriteLock(&afs_xbrs, 296);
606 for (i = 0; i < NBRS; i++, tb++) {
607 if (tb->refCount == 0)
612 tb->opcode = aopcode;
617 VN_HOLD(AFSTOV(avc));
619 tb->refCount = ause + 1;
620 tb->size_parm[0] = asparm0;
621 tb->size_parm[1] = asparm1;
622 tb->ptr_parm[0] = apparm0;
625 tb->ts = afs_brs_count++;
626 /* if daemons are waiting for work, wake them up */
627 if (afs_brsDaemons > 0) {
628 afs_osi_Wakeup(&afs_brsDaemons);
630 MReleaseWriteLock(&afs_xbrs);
634 MReleaseWriteLock(&afs_xbrs);
637 /* no free buffers, sleep a while */
639 MReleaseWriteLock(&afs_xbrs);
640 afs_osi_Sleep(&afs_brsWaiters);
641 MObtainWriteLock(&afs_xbrs, 301);
647 /* AIX 4.1 has a much different sleep/wakeup mechanism available for use.
648 * The modifications here will work for either a UP or MP machine.
650 struct buf *afs_asyncbuf = (struct buf *)0;
651 tid_t afs_asyncbuf_cv = EVENT_NULL;
652 afs_int32 afs_biodcnt = 0;
654 /* in implementing this, I assumed that all external linked lists were
657 * Several places in this code traverse a linked list. The algorithm
658 * used here is probably unfamiliar to most people. Careful examination
659 * will show that it eliminates an assignment inside the loop, as compared
660 * to the standard algorithm, at the cost of occasionally using an extra
666 * This function obtains, and returns, a pointer to a buffer for
667 * processing by a daemon. It sleeps until such a buffer is available.
668 * The source of buffers for it is the list afs_asyncbuf (see also
669 * afs_gn_strategy). This function may be invoked concurrently by
670 * several processes, that is, several instances of the same daemon.
671 * afs_gn_strategy, which adds buffers to the list, runs at interrupt
672 * level, while get_bioreq runs at process level.
674 * Since AIX 4.1 can wake just one process at a time, the separate sleep
675 * addresses have been removed.
676 * Note that the kernel_lock is held until the e_sleep_thread() occurs.
677 * The afs_asyncbuf_lock is primarily used to serialize access between
678 * process and interrupts.
680 Simple_lock afs_asyncbuf_lock;
684 struct buf *bp = NULL;
686 struct buf **bestlbpP, **lbpP;
688 struct buf *t1P, *t2P; /* temp pointers for list manipulation */
691 struct afs_bioqueue *s;
693 /* ??? Does the forward pointer of the returned buffer need to be NULL?
696 /* Disable interrupts from the strategy function, and save the
697 * prior priority level and lock access to the afs_asyncbuf.
700 oldPriority = disable_lock(INTMAX, &afs_asyncbuf_lock);
704 /* look for oldest buffer */
705 bp = bestbp = afs_asyncbuf;
706 bestage = (long)bestbp->av_back;
707 bestlbpP = &afs_asyncbuf;
713 if ((long)bp->av_back - bestage < 0) {
716 bestage = (long)bp->av_back;
720 *bestlbpP = bp->av_forw;
723 /* If afs_asyncbuf is null, it is necessary to go to sleep.
724 * e_wakeup_one() ensures that only one thread wakes.
727 /* The LOCK_HANDLER indicates to e_sleep_thread to only drop the
728 * lock on an MP machine.
731 e_sleep_thread(&afs_asyncbuf_cv, &afs_asyncbuf_lock,
732 LOCK_HANDLER | INTERRUPTIBLE);
733 if (interrupted == THREAD_INTERRUPTED) {
734 /* re-enable interrupts from strategy */
735 unlock_enable(oldPriority, &afs_asyncbuf_lock);
739 } /* end of "else asyncbuf is empty" */
740 } /* end of "inner loop" */
744 unlock_enable(oldPriority, &afs_asyncbuf_lock);
747 /* For the convenience of other code, replace the gnodes in
748 * the b_vp field of bp and the other buffers on the b_work
749 * chain with the corresponding vnodes.
751 * ??? what happens to the gnodes? They're not just cut loose,
755 t2P = (struct buf *)t1P->b_work;
756 t1P->b_vp = ((struct gnode *)t1P->b_vp)->gn_vnode;
760 t1P = (struct buf *)t2P->b_work;
761 t2P->b_vp = ((struct gnode *)t2P->b_vp)->gn_vnode;
766 /* If the buffer does not specify I/O, it may immediately
767 * be returned to the caller. This condition is detected
768 * by examining the buffer's flags (the b_flags field). If
769 * the B_PFPROT bit is set, the buffer represents a protection
770 * violation, rather than a request for I/O. The remainder
771 * of the outer loop handles the case where the B_PFPROT bit is clear.
773 if (bp->b_flags & B_PFPROT) {
778 } /* end of function get_bioreq() */
783 * This function is the daemon. It is called from the syscall
784 * interface. Ordinarily, a script or an administrator will run a
785 * daemon startup utility, specifying the number of I/O daemons to
786 * run. The utility will fork off that number of processes,
787 * each making the appropriate syscall, which will cause this
788 * function to be invoked.
790 static int afs_initbiod = 0; /* this is self-initializing code */
793 afs_BioDaemon(afs_int32 nbiods)
795 afs_int32 code, s, pflg = 0;
797 struct buf *bp, *bp1, *tbp1, *tbp2; /* temp pointers only */
805 /* pin lock, since we'll be using it in an interrupt. */
806 lock_alloc(&afs_asyncbuf_lock, LOCK_ALLOC_PIN, 2, 1);
807 simple_lock_init(&afs_asyncbuf_lock);
808 pin(&afs_asyncbuf, sizeof(struct buf *));
809 pin(&afs_asyncbuf_cv, sizeof(afs_int32));
812 /* Ignore HUP signals... */
814 sigset_t sigbits, osigbits;
816 * add SIGHUP to the set of already masked signals
818 SIGFILLSET(sigbits); /* allow all signals */
819 SIGDELSET(sigbits, SIGHUP); /* except SIGHUP */
820 limit_sigs(&sigbits, &osigbits); /* and already masked */
822 /* Main body starts here -- this is an intentional infinite loop, and
825 * Now, the loop will exit if get_bioreq() returns NULL, indicating
826 * that we've been interrupted.
829 bp = afs_get_bioreq();
831 break; /* we were interrupted */
832 if (code = setjmpx(&jmpbuf)) {
833 /* This should not have happend, maybe a lack of resources */
835 s = disable_lock(INTMAX, &afs_asyncbuf_lock);
836 for (bp1 = bp; bp; bp = bp1) {
838 bp1 = (struct buf *)bp1->b_work;
841 bp->b_flags |= B_ERROR;
844 unlock_enable(s, &afs_asyncbuf_lock);
848 vcp = VTOAFS(bp->b_vp);
849 if (bp->b_flags & B_PFSTORE) { /* XXXX */
850 ObtainWriteLock(&vcp->lock, 404);
851 if (vcp->v.v_gnode->gn_mwrcnt) {
852 afs_offs_t newlength =
853 (afs_offs_t) dbtob(bp->b_blkno) + bp->b_bcount;
854 if (vcp->m.Length < newlength) {
855 afs_Trace4(afs_iclSetp, CM_TRACE_SETLENGTH,
856 ICL_TYPE_STRING, __FILE__, ICL_TYPE_LONG,
857 __LINE__, ICL_TYPE_OFFSET,
858 ICL_HANDLE_OFFSET(vcp->m.Length),
859 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(newlength));
860 vcp->m.Length = newlength;
863 ReleaseWriteLock(&vcp->lock);
865 /* If the buffer represents a protection violation, rather than
866 * an actual request for I/O, no special action need be taken.
868 if (bp->b_flags & B_PFPROT) {
869 iodone(bp); /* Notify all users of the buffer that we're done */
874 ObtainWriteLock(&vcp->pvmlock, 211);
876 * First map its data area to a region in the current address space
877 * by calling vm_att with the subspace identifier, and a pointer to
878 * the data area. vm_att returns a new data area pointer, but we
879 * also want to hang onto the old one.
881 tmpaddr = bp->b_baddr;
882 bp->b_baddr = (caddr_t) vm_att(bp->b_xmemd.subspace_id, tmpaddr);
883 tmperr = afs_ustrategy(bp); /* temp variable saves offset calculation */
884 if (tmperr) { /* in non-error case */
885 bp->b_flags |= B_ERROR; /* should other flags remain set ??? */
886 bp->b_error = tmperr;
889 /* Unmap the buffer's data area by calling vm_det. Reset data area
890 * to the value that we saved above.
893 bp->b_baddr = tmpaddr;
896 * buffer may be linked with other buffers via the b_work field.
897 * See also afs_gn_strategy. For each buffer in the chain (including
898 * bp) notify all users of the buffer that the daemon is finished
899 * using it by calling iodone.
900 * assumes iodone can modify the b_work field.
903 tbp2 = (struct buf *)tbp1->b_work;
908 tbp1 = (struct buf *)tbp2->b_work;
914 ReleaseWriteLock(&vcp->pvmlock); /* Unlock the vnode. */
916 } /* infinite loop (unless we're interrupted) */
917 } /* end of afs_BioDaemon() */
919 #endif /* AFS_AIX41_ENV */
924 afs_BackgroundDaemon(void)
929 AFS_STATCNT(afs_BackgroundDaemon);
930 /* initialize subsystem */
932 LOCK_INIT(&afs_xbrs, "afs_xbrs");
933 memset((char *)afs_brs, 0, sizeof(afs_brs));
935 #if defined (AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
937 * steal the first daemon for doing delayed DSlot flushing
938 * (see afs_GetDownDSlot)
947 MObtainWriteLock(&afs_xbrs, 302);
950 struct brequest *min_tb = NULL;
952 if (afs_termState == AFSOP_STOP_BKG) {
954 afs_termState = AFSOP_STOP_TRUNCDAEMON;
955 MReleaseWriteLock(&afs_xbrs);
956 afs_osi_Wakeup(&afs_termState);
963 for (i = 0; i < NBRS; i++, tb++) {
964 /* look for request with smallest ts */
965 if ((tb->refCount > 0) && !(tb->flags & BSTARTED)) {
966 /* new request, not yet picked up */
967 if ((min_tb && (min_ts - tb->ts > 0)) || !min_tb) {
974 /* claim and process this request */
975 tb->flags |= BSTARTED;
976 MReleaseWriteLock(&afs_xbrs);
978 afs_Trace1(afs_iclSetp, CM_TRACE_BKG1, ICL_TYPE_INT32,
980 if (tb->opcode == BOP_FETCH)
982 else if (tb->opcode == BOP_STORE)
984 else if (tb->opcode == BOP_PATH)
987 panic("background bop");
989 AFS_RELE(AFSTOV(tb->vc)); /* MUST call vnode layer or could lose vnodes */
994 tb->cred = (struct AFS_UCRED *)0;
996 afs_BRelease(tb); /* this grabs and releases afs_xbrs lock */
997 MObtainWriteLock(&afs_xbrs, 305);
1000 /* wait for new request */
1002 MReleaseWriteLock(&afs_xbrs);
1003 afs_osi_Sleep(&afs_brsDaemons);
1004 MObtainWriteLock(&afs_xbrs, 307);
1012 shutdown_daemons(void)
1014 AFS_STATCNT(shutdown_daemons);
1015 if (afs_cold_shutdown) {
1016 afs_brsDaemons = brsInit = 0;
1017 rxepoch_checked = afs_nbrs = 0;
1018 memset((char *)afs_brs, 0, sizeof(afs_brs));
1019 memset((char *)&afs_xbrs, 0, sizeof(afs_lock_t));
1021 #ifdef AFS_AIX41_ENV
1022 lock_free(&afs_asyncbuf_lock);
1023 unpin(&afs_asyncbuf, sizeof(struct buf *));
1024 unpin(&afs_asyncbuf_cv, sizeof(afs_int32));
1030 #if defined(AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
1032 * sgi - daemon - handles certain operations that otherwise
1033 * would use up too much kernel stack space
1035 * This all assumes that since the caller must have the xdcache lock
1036 * exclusively that the list will never be more than one long
1037 * and noone else can attempt to add anything until we're done.
1039 SV_TYPE afs_sgibksync;
1040 SV_TYPE afs_sgibkwait;
1041 lock_t afs_sgibklock;
1042 struct dcache *afs_sgibklist;
1050 if (afs_sgibklock == NULL) {
1051 SV_INIT(&afs_sgibksync, "bksync", 0, 0);
1052 SV_INIT(&afs_sgibkwait, "bkwait", 0, 0);
1053 SPINLOCK_INIT(&afs_sgibklock, "bklock");
1055 s = SPLOCK(afs_sgibklock);
1057 /* wait for something to do */
1058 SP_WAIT(afs_sgibklock, s, &afs_sgibksync, PINOD);
1059 osi_Assert(afs_sgibklist);
1061 /* XX will probably need to generalize to real list someday */
1062 s = SPLOCK(afs_sgibklock);
1063 while (afs_sgibklist) {
1064 tdc = afs_sgibklist;
1065 afs_sgibklist = NULL;
1066 SPUNLOCK(afs_sgibklock, s);
1068 tdc->dflags &= ~DFEntryMod;
1069 afs_WriteDCache(tdc, 1);
1071 s = SPLOCK(afs_sgibklock);
1074 /* done all the work - wake everyone up */
1075 while (SV_SIGNAL(&afs_sgibkwait));