/*
* Copyright 2000, International Business Machines Corporation and others.
* All Rights Reserved.
- *
+ *
* This software has been released under the terms of the IBM Public
* License. For details, see the LICENSE file in the top-level source
* directory or online at http://www.openafs.org/dl/license10.html
#include <afsconfig.h>
#include "afs/param.h"
-RCSID
- ("$Header$");
#ifdef AFS_AIX51_ENV
#define __FULL_PROTO
#include <sys/adspace.h> /* for vm_att(), vm_det() */
#endif
-
+#if defined(AFS_CACHE_BYPASS)
+#include "afs/afs_bypasscache.h"
+#endif /* AFS_CACHE_BYPASS */
/* background request queue size */
afs_lock_t afs_xbrs; /* lock for brs */
static int brsInit = 0;
struct afs_osi_WaitHandle AFS_WaitHandler, AFS_CSWaitHandler;
static int afs_brs_count = 0; /* request counter, to service reqs in order */
-static int rxepoch_checked = 0;
-#define afs_CheckRXEpoch() {if (rxepoch_checked == 0 && rxkad_EpochWasSet) { \
- rxepoch_checked = 1; afs_GCUserData(/* force flag */ 1); } }
-
/* PAG garbage collection */
/* We induce a compile error if param.h does not define AFS_GCPAGS */
afs_int32 afs_gcpags = AFS_GCPAGS;
afs_int32 afs_gcpags_procsize = 0;
afs_int32 afs_CheckServerDaemonStarted = 0;
-#ifdef DEFAULT_PROBE_INTERVAL
-afs_int32 PROBE_INTERVAL = DEFAULT_PROBE_INTERVAL; /* overridding during compile */
-#else
-afs_int32 PROBE_INTERVAL = 180; /* default to 3 min */
+#ifndef DEFAULT_PROBE_INTERVAL
+#define DEFAULT_PROBE_INTERVAL 30 /* default to 3 min */
#endif
+afs_int32 afs_probe_interval = DEFAULT_PROBE_INTERVAL;
+afs_int32 afs_probe_all_interval = 600;
+afs_int32 afs_nat_probe_interval = 60;
+afs_int32 afs_preCache = 0;
+
+#define PROBE_WAIT() (1000 * (afs_probe_interval - ((afs_random() & 0x7fffffff) \
+ % (afs_probe_interval/2))))
-#define PROBE_WAIT() (1000 * (PROBE_INTERVAL - ((afs_random() & 0x7fffffff) \
- % (PROBE_INTERVAL/2))))
+void
+afs_SetCheckServerNATmode(int isnat)
+{
+ static afs_int32 old_intvl, old_all_intvl;
+ static int wasnat;
+
+ if (isnat && !wasnat) {
+ old_intvl = afs_probe_interval;
+ old_all_intvl = afs_probe_all_interval;
+ afs_probe_interval = afs_nat_probe_interval;
+ afs_probe_all_interval = afs_nat_probe_interval;
+ afs_osi_CancelWait(&AFS_CSWaitHandler);
+ } else if (!isnat && wasnat) {
+ afs_probe_interval = old_intvl;
+ afs_probe_all_interval = old_all_intvl;
+ }
+ wasnat = isnat;
+}
void
afs_CheckServerDaemon(void)
last10MinCheck = lastCheck = osi_Time();
while (1) {
if (afs_termState == AFSOP_STOP_CS) {
- afs_termState = AFSOP_STOP_BKG;
+ afs_termState = AFSOP_STOP_TRUNCDAEMON;
afs_osi_Wakeup(&afs_termState);
break;
}
now = osi_Time();
- if (PROBE_INTERVAL + lastCheck <= now) {
+ if (afs_probe_interval + lastCheck <= now) {
afs_CheckServers(1, NULL); /* check down servers */
lastCheck = now = osi_Time();
}
- if (600 + last10MinCheck <= now) {
- afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, 600);
+ if (afs_probe_all_interval + last10MinCheck <= now) {
+ afs_Trace1(afs_iclSetp, CM_TRACE_PROBEUP, ICL_TYPE_INT32, afs_probe_all_interval);
afs_CheckServers(0, NULL);
last10MinCheck = now = osi_Time();
}
/* shutdown check. */
if (afs_termState == AFSOP_STOP_CS) {
- afs_termState = AFSOP_STOP_BKG;
+ afs_termState = AFSOP_STOP_TRUNCDAEMON;
afs_osi_Wakeup(&afs_termState);
break;
}
/* Compute time to next probe. */
- delay = PROBE_INTERVAL + lastCheck;
- if (delay > 600 + last10MinCheck)
- delay = 600 + last10MinCheck;
+ delay = afs_probe_interval + lastCheck;
+ if (delay > afs_probe_all_interval + last10MinCheck)
+ delay = afs_probe_all_interval + last10MinCheck;
delay -= now;
if (delay < 1)
delay = 1;
afs_CheckServerDaemonStarted = 0;
}
+extern int vfs_context_ref;
+
+/* This function always holds the GLOCK whilst it is running. The caller
+ * gets the GLOCK before invoking it, and afs_osi_Sleep drops the GLOCK
+ * whilst we are sleeping, and regains it when we're woken up.
+ */
void
afs_Daemon(void)
{
struct afs_exporter *exporter;
afs_int32 now;
afs_int32 last3MinCheck, last10MinCheck, last60MinCheck, lastNMinCheck;
- afs_int32 last1MinCheck;
+ afs_int32 last1MinCheck, last5MinCheck;
afs_uint32 lastCBSlotBump;
- char cs_warned = 0;
AFS_STATCNT(afs_Daemon);
- last1MinCheck = last3MinCheck = last60MinCheck = last10MinCheck =
- lastNMinCheck = 0;
afs_rootFid.Fid.Volume = 0;
while (afs_initState < 101)
afs_osi_Sleep(&afs_initState);
+#ifdef AFS_DARWIN80_ENV
+ if (afs_osi_ctxtp_initialized)
+ osi_Panic("vfs context already initialized");
+ while (afs_osi_ctxtp && vfs_context_ref)
+ afs_osi_Sleep(&afs_osi_ctxtp);
+ if (afs_osi_ctxtp && !vfs_context_ref)
+ vfs_context_rele(afs_osi_ctxtp);
+ afs_osi_ctxtp = vfs_context_create(NULL);
+ afs_osi_ctxtp_initialized = 1;
+#endif
now = osi_Time();
lastCBSlotBump = now;
last3MinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
last60MinCheck = now - 1800 + ((afs_random() & 0x7fffffff) % 3600);
last10MinCheck = now - 300 + ((afs_random() & 0x7fffffff) % 600);
+ last5MinCheck = now - 150 + ((afs_random() & 0x7fffffff) % 300);
lastNMinCheck = now - 90 + ((afs_random() & 0x7fffffff) % 180);
/* start off with afs_initState >= 101 (basic init done) */
if (afs_nfsexporter)
afs_FlushActiveVcaches(0); /* flush NFS writes */
afs_FlushVCBs(1); /* flush queued callbacks */
+
afs_MaybeWakeupTruncateDaemon(); /* free cache space if have too */
rx_CheckPackets(); /* Does RX need more packets? */
-#if defined(AFS_AIX32_ENV) || defined(AFS_HPUX_ENV)
- /*
- * Hack: We always want to make sure there are plenty free
- * entries in the small free pool so that we don't have to
- * worry about rx (with disabled interrupts) to have to call
- * malloc). So we do the dummy call below...
- */
- if (((afs_stats_cmperf.SmallBlocksAlloced -
- afs_stats_cmperf.SmallBlocksActive)
- <= AFS_SALLOC_LOW_WATER))
- osi_FreeSmallSpace(osi_AllocSmallSpace(AFS_SMALLOCSIZ));
- if (((afs_stats_cmperf.MediumBlocksAlloced -
- afs_stats_cmperf.MediumBlocksActive)
- <= AFS_MALLOC_LOW_WATER + 50))
- osi_AllocMoreMSpace(AFS_MALLOC_LOW_WATER * 2);
-#endif
now = osi_Time();
if (lastCBSlotBump + CBHTSLOTLEN < now) { /* pretty time-dependant */
/* things to do every minute */
DFlush(); /* write out dir buffers */
afs_WriteThroughDSlots(); /* write through cacheinfo entries */
+ ObtainWriteLock(&afs_xvcache, 736);
+ afs_FlushReclaimedVcaches();
+ ReleaseWriteLock(&afs_xvcache);
afs_FlushActiveVcaches(1); /* keep flocks held & flush nfs writes */
-#ifdef AFS_DISCON_ENV
+#if 0
afs_StoreDirtyVcaches();
#endif
- afs_CheckRXEpoch();
last1MinCheck = now;
}
* tickets */
last3MinCheck = now;
}
- if (!afs_CheckServerDaemonStarted) {
- /* Do the check here if the correct afsd is not installed. */
- if (!cs_warned) {
- cs_warned = 1;
- printf("Please install afsd with check server daemon.\n");
+
+ if (afsd_dynamic_vcaches && (last5MinCheck + 300 < now)) {
+ /* start with trying to drop us back to our base usage */
+ int anumber = VCACHE_FREE + (afs_vcount - afs_cacheStats);
+
+ if (anumber > 0) {
+ ObtainWriteLock(&afs_xvcache, 734);
+ afs_ShakeLooseVCaches(anumber);
+ ReleaseWriteLock(&afs_xvcache);
}
- if (lastNMinCheck + PROBE_INTERVAL < now) {
+ last5MinCheck = now;
+ }
+
+ if (!afs_CheckServerDaemonStarted) {
+ if (lastNMinCheck + afs_probe_interval < now) {
/* only check down servers */
afs_CheckServers(1, NULL);
lastNMinCheck = now;
#endif /* else AFS_USERSPACE_IP_ADDR */
if (!afs_CheckServerDaemonStarted)
afs_CheckServers(0, NULL);
- afs_GCUserData(0); /* gc old conns */
+ afs_GCUserData(); /* gc old conns */
/* This is probably the wrong way of doing GC for the various exporters but it will suffice for a while */
for (exporter = root_exported; exporter;
exporter = exporter->exp_next) {
/* 18285 is because we're trying to divide evenly into 128, that is,
* CBSlotLen, while staying just under 20 seconds. If CBSlotLen
- * changes, should probably change this interval, too.
+ * changes, should probably change this interval, too.
* Some of the preceding actions may take quite some time, so we
* might not want to wait the entire interval */
now = 18285 - (osi_Time() - now);
if (afs_CheckServerDaemonStarted)
afs_termState = AFSOP_STOP_CS;
else
- afs_termState = AFSOP_STOP_BKG;
+ afs_termState = AFSOP_STOP_TRUNCDAEMON;
afs_osi_Wakeup(&afs_termState);
return;
}
int
afs_CheckRootVolume(void)
{
- char rootVolName[32];
+ char rootVolName[MAXROOTVOLNAMELEN];
struct volume *tvp = NULL;
int usingDynroot = afs_GetDynrootEnable();
int localcell;
* count to zero and fs checkv is executed when the current
* directory is /afs.
*/
+#ifdef AFS_LINUX22_ENV
+ osi_ResetRootVCache(volid);
+#else
+# ifdef AFS_DARWIN80_ENV
+ afs_PutVCache(afs_globalVp);
+# else
AFS_FAST_RELE(afs_globalVp);
+# endif
afs_globalVp = 0;
+#endif
}
afs_rootFid.Fid.Volume = volid;
afs_rootFid.Fid.Vnode = 1;
afs_osi_Wakeup(&afs_initState);
afs_PutVolume(tvp, READ_LOCK);
}
-#ifdef AFS_DEC_ENV
-/* This is to make sure that we update the root gnode */
-/* every time root volume gets released */
- {
- struct gnode *rootgp;
- struct mount *mp;
- int code;
-
- /* Only do this if afs_globalVFS is properly set due to race conditions
- * this routine could be called before the gfs_mount is performed!
- * Furthermore, afs_root (called below) *waits* until
- * initState >= 200, so we don't try this until we've gotten
- * at least that far */
- if (afs_globalVFS && afs_initState >= 200) {
- if (code = afs_root(afs_globalVFS, &rootgp))
- return code;
- mp = (struct mount *)afs_globalVFS->vfs_data;
- mp->m_rootgp = gget(mp, 0, 0, (char *)rootgp);
- afs_unlock(mp->m_rootgp); /* unlock basic gnode */
- afs_vrele(VTOAFS(rootgp)); /* zap afs_root's vnode hold */
- }
- }
-#endif
if (afs_rootFid.Fid.Volume)
return 0;
else
/* ptr_parm 0 is the pathname, size_parm 0 to the fetch is the chunk number */
static void
-BPath(register struct brequest *ab)
+BPath(struct brequest *ab)
{
- register struct dcache *tdc = NULL;
+ struct dcache *tdc = NULL;
struct vcache *tvc = NULL;
struct vnode *tvn = NULL;
#ifdef AFS_LINUX22_ENV
struct dentry *dp = NULL;
#endif
afs_size_t offset, len;
- struct vrequest treq;
+ struct vrequest *treq = NULL;
afs_int32 code;
AFS_STATCNT(BPath);
- if ((code = afs_InitReq(&treq, ab->cred)))
+ if ((code = afs_CreateReq(&treq, ab->cred))) {
return;
+ }
AFS_GUNLOCK();
#ifdef AFS_LINUX22_ENV
- code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, NULL, &dp);
+ code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &dp);
if (dp)
tvn = (struct vnode *)dp->d_inode;
#else
- code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, NULL, &tvn);
+ code = gop_lookupname((char *)ab->ptr_parm[0], AFS_UIOSYS, 1, &tvn);
#endif
AFS_GLOCK();
osi_FreeLargeSpace((char *)ab->ptr_parm[0]); /* free path name buffer here */
- if (code)
+ if (code) {
+ afs_DestroyReq(treq);
return;
+ }
/* now path may not have been in afs, so check that before calling our cache manager */
if (!tvn || !IsAfsVnode(tvn)) {
/* release it and give up */
if (tvn) {
-#ifdef AFS_DEC_ENV
- grele(tvn);
-#else
#ifdef AFS_LINUX22_ENV
dput(dp);
#else
AFS_RELE(tvn);
#endif
-#endif
}
+ afs_DestroyReq(treq);
return;
}
-#ifdef AFS_DEC_ENV
- tvc = VTOAFS(afs_gntovn(tvn));
-#else
tvc = VTOAFS(tvn);
-#endif
/* here we know its an afs vnode, so we can get the data for the chunk */
- tdc = afs_GetDCache(tvc, ab->size_parm[0], &treq, &offset, &len, 1);
+ tdc = afs_GetDCache(tvc, ab->size_parm[0], treq, &offset, &len, 1);
if (tdc) {
afs_PutDCache(tdc);
}
-#ifdef AFS_DEC_ENV
- grele(tvn);
-#else
#ifdef AFS_LINUX22_ENV
dput(dp);
#else
AFS_RELE(tvn);
#endif
-#endif
+ afs_DestroyReq(treq);
}
/* size_parm 0 to the fetch is the chunk number,
* size_parm 1 is true iff we should release the dcache entry here.
*/
static void
-BPrefetch(register struct brequest *ab)
+BPrefetch(struct brequest *ab)
{
- register struct dcache *tdc;
- register struct vcache *tvc;
- afs_size_t offset, len;
- struct vrequest treq;
+ struct dcache *tdc;
+ struct vcache *tvc;
+ afs_size_t offset, len, abyte, totallen = 0;
+ struct vrequest *treq = NULL;
+ int code;
AFS_STATCNT(BPrefetch);
- if ((len = afs_InitReq(&treq, ab->cred)))
+ if ((code = afs_CreateReq(&treq, ab->cred)))
return;
+ abyte = ab->size_parm[0];
tvc = ab->vc;
- tdc = afs_GetDCache(tvc, ab->size_parm[0], &treq, &offset, &len, 1);
- if (tdc) {
- afs_PutDCache(tdc);
- }
+ do {
+ tdc = afs_GetDCache(tvc, abyte, treq, &offset, &len, 1);
+ if (tdc) {
+ afs_PutDCache(tdc);
+ }
+ abyte+=len;
+ totallen += len;
+ } while ((totallen < afs_preCache) && tdc && (len > 0));
/* now, dude may be waiting for us to clear DFFetchReq bit; do so. Can't
* use tdc from GetDCache since afs_GetDCache may fail, but someone may
* be waiting for our wakeup anyway.
if (ab->size_parm[1]) {
afs_PutDCache(tdc); /* put this one back, too */
}
+ afs_DestroyReq(treq);
}
+#if defined(AFS_CACHE_BYPASS)
+static void
+BPrefetchNoCache(struct brequest *ab)
+{
+ struct vrequest *treq = NULL;
+ int code;
+
+ if ((code = afs_CreateReq(&treq, ab->cred)))
+ return;
+
+#ifndef UKERNEL
+ /* OS-specific prefetch routine */
+ afs_PrefetchNoCache(ab->vc, ab->cred, (struct nocache_read_request *) ab->ptr_parm[0]);
+#endif
+ afs_DestroyReq(treq);
+}
+#endif
static void
-BStore(register struct brequest *ab)
+BStore(struct brequest *ab)
{
- register struct vcache *tvc;
- register afs_int32 code;
- struct vrequest treq;
+ struct vcache *tvc;
+ afs_int32 code;
+ struct vrequest *treq = NULL;
#if defined(AFS_SGI_ENV)
struct cred *tmpcred;
#endif
AFS_STATCNT(BStore);
- if ((code = afs_InitReq(&treq, ab->cred)))
+ if ((code = afs_CreateReq(&treq, ab->cred)))
return;
- code = 0;
tvc = ab->vc;
#if defined(AFS_SGI_ENV)
/*
AFS_RWLOCK((vnode_t *) tvc, 1);
#endif
ObtainWriteLock(&tvc->lock, 209);
- code = afs_StoreOnLastReference(tvc, &treq);
+ code = afs_StoreOnLastReference(tvc, treq);
ReleaseWriteLock(&tvc->lock);
#if defined(AFS_SGI_ENV)
OSI_SET_CURRENT_CRED(tmpcred);
#endif
/* now set final return code, and wakeup anyone waiting */
if ((ab->flags & BUVALID) == 0) {
- ab->code = afs_CheckCode(code, &treq, 43); /* set final code, since treq doesn't go across processes */
+
+ /* To explain code_raw/code_checkcode:
+ * Anyone that's waiting won't have our treq, so they won't be able to
+ * call afs_CheckCode themselves on the return code we provide here.
+ * But if we give back only the afs_CheckCode value, they won't know
+ * what the "raw" value was. So give back both values, so the waiter
+ * can know the "raw" value for interpreting the value internally, as
+ * well as the afs_CheckCode value to give to the OS. */
+ ab->code_raw = code;
+ ab->code_checkcode = afs_CheckCode(code, treq, 430);
+
ab->flags |= BUVALID;
if (ab->flags & BUWAIT) {
ab->flags &= ~BUWAIT;
afs_osi_Wakeup(ab);
}
}
+ afs_DestroyReq(treq);
+}
+
+static void
+BPartialStore(struct brequest *ab)
+{
+ struct vcache *tvc;
+ afs_int32 code;
+ struct vrequest *treq = NULL;
+ int locked, shared_locked = 0;
+
+ AFS_STATCNT(BStore);
+ if ((code = afs_CreateReq(&treq, ab->cred)))
+ return;
+ tvc = ab->vc;
+ locked = tvc->lock.excl_locked? 1:0;
+ if (!locked)
+ ObtainWriteLock(&tvc->lock, 1209);
+ else if (!(tvc->lock.excl_locked & WRITE_LOCK)) {
+ shared_locked = 1;
+ ConvertSToRLock(&tvc->lock);
+ }
+ code = afs_StoreAllSegments(tvc, treq, AFS_ASYNC);
+ if (!locked)
+ ReleaseWriteLock(&tvc->lock);
+ else if (shared_locked)
+ ConvertSToRLock(&tvc->lock);
+ /* now set final return code, and wakeup anyone waiting */
+ if ((ab->flags & BUVALID) == 0) {
+ /* set final code, since treq doesn't go across processes */
+ ab->code_raw = code;
+ ab->code_checkcode = afs_CheckCode(code, treq, 43);
+ ab->flags |= BUVALID;
+ if (ab->flags & BUWAIT) {
+ ab->flags &= ~BUWAIT;
+ afs_osi_Wakeup(ab);
+ }
+ }
+ afs_DestroyReq(treq);
}
/* release a held request buffer */
void
-afs_BRelease(register struct brequest *ab)
+afs_BRelease(struct brequest *ab)
{
AFS_STATCNT(afs_BRelease);
- MObtainWriteLock(&afs_xbrs, 294);
+ ObtainWriteLock(&afs_xbrs, 294);
if (--ab->refCount <= 0) {
ab->flags = 0;
}
if (afs_brsWaiters)
afs_osi_Wakeup(&afs_brsWaiters);
- MReleaseWriteLock(&afs_xbrs);
+ ReleaseWriteLock(&afs_xbrs);
}
/* return true if bkg fetch daemons are all busy */
}
struct brequest *
-afs_BQueue(register short aopcode, register struct vcache *avc,
- afs_int32 dontwait, afs_int32 ause, struct AFS_UCRED *acred,
- afs_size_t asparm0, afs_size_t asparm1, void *apparm0)
+afs_BQueue(short aopcode, struct vcache *avc,
+ afs_int32 dontwait, afs_int32 ause, afs_ucred_t *acred,
+ afs_size_t asparm0, afs_size_t asparm1, void *apparm0,
+ void *apparm1, void *apparm2)
{
- register int i;
- register struct brequest *tb;
+ int i;
+ struct brequest *tb;
AFS_STATCNT(afs_BQueue);
- MObtainWriteLock(&afs_xbrs, 296);
+ ObtainWriteLock(&afs_xbrs, 296);
while (1) {
tb = afs_brs;
for (i = 0; i < NBRS; i++, tb++) {
tb->opcode = aopcode;
tb->vc = avc;
tb->cred = acred;
- crhold(tb->cred);
+ if (tb->cred) {
+ crhold(tb->cred);
+ }
if (avc) {
-#ifdef AFS_DEC_ENV
- avc->vrefCount++;
-#else
- VN_HOLD(AFSTOV(avc));
-#endif
+ AFS_FAST_HOLD(avc);
}
tb->refCount = ause + 1;
tb->size_parm[0] = asparm0;
tb->size_parm[1] = asparm1;
tb->ptr_parm[0] = apparm0;
+ tb->ptr_parm[1] = apparm1;
+ tb->ptr_parm[2] = apparm2;
tb->flags = 0;
- tb->code = 0;
+ tb->code_raw = tb->code_checkcode = 0;
tb->ts = afs_brs_count++;
/* if daemons are waiting for work, wake them up */
if (afs_brsDaemons > 0) {
afs_osi_Wakeup(&afs_brsDaemons);
}
- MReleaseWriteLock(&afs_xbrs);
+ ReleaseWriteLock(&afs_xbrs);
return tb;
}
if (dontwait) {
- MReleaseWriteLock(&afs_xbrs);
+ ReleaseWriteLock(&afs_xbrs);
return NULL;
}
/* no free buffers, sleep a while */
afs_brsWaiters++;
- MReleaseWriteLock(&afs_xbrs);
+ ReleaseWriteLock(&afs_xbrs);
afs_osi_Sleep(&afs_brsWaiters);
- MObtainWriteLock(&afs_xbrs, 301);
+ ObtainWriteLock(&afs_xbrs, 301);
afs_brsWaiters--;
}
}
-#ifdef AFS_AIX32_ENV
#ifdef AFS_AIX41_ENV
-/* AIX 4.1 has a much different sleep/wakeup mechanism available for use.
+/* AIX 4.1 has a much different sleep/wakeup mechanism available for use.
* The modifications here will work for either a UP or MP machine.
*/
struct buf *afs_asyncbuf = (struct buf *)0;
afs_int32 afs_biodcnt = 0;
/* in implementing this, I assumed that all external linked lists were
- * null-terminated.
+ * null-terminated.
*
* Several places in this code traverse a linked list. The algorithm
* used here is probably unfamiliar to most people. Careful examination
*
* This function obtains, and returns, a pointer to a buffer for
* processing by a daemon. It sleeps until such a buffer is available.
- * The source of buffers for it is the list afs_asyncbuf (see also
- * naix_vm_strategy). This function may be invoked concurrently by
+ * The source of buffers for it is the list afs_asyncbuf (see also
+ * afs_gn_strategy). This function may be invoked concurrently by
* several processes, that is, several instances of the same daemon.
- * naix_vm_strategy, which adds buffers to the list, runs at interrupt
+ * afs_gn_strategy, which adds buffers to the list, runs at interrupt
* level, while get_bioreq runs at process level.
*
* Since AIX 4.1 can wake just one process at a time, the separate sleep
* addresses have been removed.
- * Note that the kernel_lock is held until the e_sleep_thread() occurs.
+ * Note that the kernel_lock is held until the e_sleep_thread() occurs.
* The afs_asyncbuf_lock is primarily used to serialize access between
* process and interrupts.
*/
Simple_lock afs_asyncbuf_lock;
-/*static*/ struct buf *
+struct buf *
afs_get_bioreq()
{
struct buf *bp = NULL;
/* ??? Does the forward pointer of the returned buffer need to be NULL?
*/
- /* Disable interrupts from the strategy function, and save the
+ /* Disable interrupts from the strategy function, and save the
* prior priority level and lock access to the afs_asyncbuf.
*/
AFS_GUNLOCK();
/* For the convenience of other code, replace the gnodes in
* the b_vp field of bp and the other buffers on the b_work
- * chain with the corresponding vnodes.
+ * chain with the corresponding vnodes.
*
* ??? what happens to the gnodes? They're not just cut loose,
* are they?
limit_sigs(&sigbits, &osigbits); /* and already masked */
}
/* Main body starts here -- this is an intentional infinite loop, and
- * should NEVER exit
+ * should NEVER exit
*
- * Now, the loop will exit if get_bioreq() returns NULL, indicating
+ * Now, the loop will exit if get_bioreq() returns NULL, indicating
* that we've been interrupted.
*/
while (1) {
if (vcp->v.v_gnode->gn_mwrcnt) {
afs_offs_t newlength =
(afs_offs_t) dbtob(bp->b_blkno) + bp->b_bcount;
- if (vcp->m.Length < newlength) {
+ if (vcp->f.m.Length < newlength) {
afs_Trace4(afs_iclSetp, CM_TRACE_SETLENGTH,
ICL_TYPE_STRING, __FILE__, ICL_TYPE_LONG,
__LINE__, ICL_TYPE_OFFSET,
- ICL_HANDLE_OFFSET(vcp->m.Length),
+ ICL_HANDLE_OFFSET(vcp->f.m.Length),
ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(newlength));
- vcp->m.Length = newlength;
+ vcp->f.m.Length = newlength;
}
}
ReleaseWriteLock(&vcp->lock);
}
/* If the buffer represents a protection violation, rather than
- * an actual request for I/O, no special action need be taken.
+ * an actual request for I/O, no special action need be taken.
*/
if (bp->b_flags & B_PFPROT) {
iodone(bp); /* Notify all users of the buffer that we're done */
/*
* buffer may be linked with other buffers via the b_work field.
- * See also naix_vm_strategy. For each buffer in the chain (including
+ * See also afs_gn_strategy. For each buffer in the chain (including
* bp) notify all users of the buffer that the daemon is finished
- * using it by calling iodone.
+ * using it by calling iodone.
* assumes iodone can modify the b_work field.
*/
for (tbp1 = bp;;) {
} /* infinite loop (unless we're interrupted) */
} /* end of afs_BioDaemon() */
-#else /* AFS_AIX41_ENV */
-
-
-#define squeue afs_q
-struct afs_bioqueue {
- struct squeue lruq;
- int sleeper;
- int cnt;
-};
-struct afs_bioqueue afs_bioqueue;
-struct buf *afs_busyq = NULL;
-struct buf *afs_asyncbuf;
-afs_int32 afs_biodcnt = 0;
-
-/* in implementing this, I assumed that all external linked lists were
- * null-terminated.
- *
- * Several places in this code traverse a linked list. The algorithm
- * used here is probably unfamiliar to most people. Careful examination
- * will show that it eliminates an assignment inside the loop, as compared
- * to the standard algorithm, at the cost of occasionally using an extra
- * variable.
- */
+#endif /* AFS_AIX41_ENV */
-/* get_bioreq()
- *
- * This function obtains, and returns, a pointer to a buffer for
- * processing by a daemon. It sleeps until such a buffer is available.
- * The source of buffers for it is the list afs_asyncbuf (see also
- * naix_vm_strategy). This function may be invoked concurrently by
- * several processes, that is, several instances of the same daemon.
- * naix_vm_strategy, which adds buffers to the list, runs at interrupt
- * level, while get_bioreq runs at process level.
- *
- * The common kernel paradigm of sleeping and waking up, in which all the
- * competing processes sleep waiting for wakeups on one address, is not
- * followed here. Instead, the following paradigm is used: when a daemon
- * goes to sleep, it checks for other sleeping daemons. If there aren't any,
- * it sleeps on the address of variable afs_asyncbuf. But if there is
- * already a daemon sleeping on that address, it threads its own unique
- * address onto a list, and sleeps on that address. This way, every
- * sleeper is sleeping on a different address, and every wakeup wakes up
- * exactly one daemon. This prevents a whole bunch of daemons from waking
- * up and then immediately having to go back to sleep. This provides a
- * performance gain and makes the I/O scheduling a bit more deterministic.
- * The list of sleepers is variable afs_bioqueue. The unique address
- * on which to sleep is passed to get_bioreq as its parameter.
- */
-/*static*/ struct buf *
-afs_get_bioreq(self)
- struct afs_bioqueue *self; /* address on which to sleep */
+int afs_nbrs = 0;
+static_inline void
+afs_BackgroundDaemon_once(void)
{
- struct buf *bp = NULL;
- struct buf *bestbp;
- struct buf **bestlbpP, **lbpP;
- int bestage, stop;
- struct buf *t1P, *t2P; /* temp pointers for list manipulation */
- int oldPriority;
- afs_uint32 wait_ret;
- struct afs_bioqueue *s;
-
- /* ??? Does the forward pointer of the returned buffer need to be NULL?
- */
-
- /* Disable interrupts from the strategy function, and save the
- * prior priority level
- */
- oldPriority = i_disable(INTMAX);
-
- /* Each iteration of following loop either pulls
- * a buffer off afs_asyncbuf, or sleeps.
+ LOCK_INIT(&afs_xbrs, "afs_xbrs");
+ memset(afs_brs, 0, sizeof(afs_brs));
+ brsInit = 1;
+#if defined (AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
+ /*
+ * steal the first daemon for doing delayed DSlot flushing
+ * (see afs_GetDownDSlot)
*/
- while (1) { /* inner loop */
- if (afs_asyncbuf) {
- /* look for oldest buffer */
- bp = bestbp = afs_asyncbuf;
- bestage = (int)bestbp->av_back;
- bestlbpP = &afs_asyncbuf;
- while (1) {
- lbpP = &bp->av_forw;
- bp = *lbpP;
- if (!bp)
- break;
- if ((int)bp->av_back - bestage < 0) {
- bestbp = bp;
- bestlbpP = lbpP;
- bestage = (int)bp->av_back;
- }
- }
- bp = bestbp;
- *bestlbpP = bp->av_forw;
- break;
- } else {
- int interrupted;
-
- /* If afs_asyncbuf is null, it is necessary to go to sleep.
- * There are two possibilities: either there is already a
- * daemon that is sleeping on the address of afs_asyncbuf,
- * or there isn't.
- */
- if (afs_bioqueue.sleeper) {
- /* enqueue */
- QAdd(&(afs_bioqueue.lruq), &(self->lruq));
- interrupted = sleep((caddr_t) self, PCATCH | (PZERO + 1));
- if (self->lruq.next != &self->lruq) { /* XXX ##3 XXX */
- QRemove(&(self->lruq)); /* dequeue */
- }
- self->cnt++;
- afs_bioqueue.sleeper = FALSE;
- if (interrupted) {
- /* re-enable interrupts from strategy */
- i_enable(oldPriority);
- return (NULL);
- }
- continue;
- } else {
- afs_bioqueue.sleeper = TRUE;
- interrupted =
- sleep((caddr_t) & afs_asyncbuf, PCATCH | (PZERO + 1));
- afs_bioqueue.sleeper = FALSE;
- if (interrupted) {
- /*
- * We need to wakeup another daemon if present
- * since we were waiting on afs_asyncbuf.
- */
-#ifdef notdef /* The following doesn't work as advertised */
- if (afs_bioqueue.lruq.next != &afs_bioqueue.lruq) {
- struct squeue *bq = afs_bioqueue.lruq.next;
- QRemove(bq);
- wakeup(bq);
- }
+ AFS_GUNLOCK();
+ afs_sgidaemon();
+ exit(CLD_EXITED, 0);
#endif
- /* re-enable interrupts from strategy */
- i_enable(oldPriority);
- return (NULL);
- }
- continue;
- }
-
- } /* end of "else asyncbuf is empty" */
- } /* end of "inner loop" */
-
- /*assert (bp); */
-
- i_enable(oldPriority); /* re-enable interrupts from strategy */
-
- /* For the convenience of other code, replace the gnodes in
- * the b_vp field of bp and the other buffers on the b_work
- * chain with the corresponding vnodes.
- *
- * ??? what happens to the gnodes? They're not just cut loose,
- * are they?
- */
- for (t1P = bp;;) {
- t2P = (struct buf *)t1P->b_work;
- t1P->b_vp = ((struct gnode *)t1P->b_vp)->gn_vnode;
- if (!t2P)
- break;
-
- t1P = (struct buf *)t2P->b_work;
- t2P->b_vp = ((struct gnode *)t2P->b_vp)->gn_vnode;
- if (!t1P)
- break;
- }
-
- /* If the buffer does not specify I/O, it may immediately
- * be returned to the caller. This condition is detected
- * by examining the buffer's flags (the b_flags field). If
- * the B_PFPROT bit is set, the buffer represents a protection
- * violation, rather than a request for I/O. The remainder
- * of the outer loop handles the case where the B_PFPROT bit is clear.
- */
- if (bp->b_flags & B_PFPROT) {
- return (bp);
- }
-
- /* wake up another process to handle the next buffer, and return
- * bp to the caller.
- */
- oldPriority = i_disable(INTMAX);
-
- /* determine where to find the sleeping process.
- * There are two cases: either it is sleeping on
- * afs_asyncbuf, or it is sleeping on its own unique
- * address. These cases are distinguished by examining
- * the sleeper field of afs_bioqueue.
- */
- if (afs_bioqueue.sleeper) {
- wakeup(&afs_asyncbuf);
- } else {
- if (afs_bioqueue.lruq.next == &afs_bioqueue.lruq) {
- /* queue is empty, what now? ??? */
- /* Should this be impossible, or does */
- /* it just mean that nobody is sleeping? */ ;
- } else {
- struct squeue *bq = afs_bioqueue.lruq.next;
- QRemove(bq);
- QInit(bq);
- wakeup(bq);
- afs_bioqueue.sleeper = TRUE;
- }
- }
- i_enable(oldPriority); /* re-enable interrupts from strategy */
- return (bp);
-
-} /* end of function get_bioreq() */
-
+}
-/* afs_BioDaemon
- *
- * This function is the daemon. It is called from the syscall
- * interface. Ordinarily, a script or an administrator will run a
- * daemon startup utility, specifying the number of I/O daemons to
- * run. The utility will fork off that number of processes,
- * each making the appropriate syscall, which will cause this
- * function to be invoked.
- */
-static int afs_initbiod = 0; /* this is self-initializing code */
-int DOvmlock = 0;
-afs_BioDaemon(nbiods)
- afs_int32 nbiods;
+static_inline void
+brequest_release(struct brequest *tb)
{
- struct afs_bioqueue *self;
- afs_int32 code, s, pflg = 0;
- label_t jmpbuf;
- struct buf *bp, *bp1, *tbp1, *tbp2; /* temp pointers only */
- caddr_t tmpaddr;
- struct vnode *vp;
- struct vcache *vcp;
- char tmperr;
- if (!afs_initbiod) {
- /* XXX ###1 XXX */
- afs_initbiod = 1;
- /* Initialize the queue of waiting processes, afs_bioqueue. */
- QInit(&(afs_bioqueue.lruq));
+ if (tb->vc) {
+ AFS_RELE(AFSTOV(tb->vc)); /* MUST call vnode layer or could lose vnodes */
+ tb->vc = NULL;
}
+ if (tb->cred) {
+ crfree(tb->cred);
+ tb->cred = (afs_ucred_t *)0;
+ }
+ afs_BRelease(tb); /* this grabs and releases afs_xbrs lock */
+}
- /* establish ourself as a kernel process so shutdown won't kill us */
-/* u.u_procp->p_flag |= SKPROC;*/
-
- /* Initialize a token (self) to use in the queue of sleeping processes. */
- self = (struct afs_bioqueue *)afs_osi_Alloc(sizeof(struct afs_bioqueue));
- pin(self, sizeof(struct afs_bioqueue)); /* fix in memory */
- memset(self, 0, sizeof(*self));
- QInit(&(self->lruq)); /* initialize queue entry pointers */
-
-
- /* Ignore HUP signals... */
- SIGDELSET(u.u_procp->p_sig, SIGHUP);
- SIGADDSET(u.u_procp->p_sigignore, SIGHUP);
- SIGDELSET(u.u_procp->p_sigcatch, SIGHUP);
- /* Main body starts here -- this is an intentional infinite loop, and
- * should NEVER exit
- *
- * Now, the loop will exit if get_bioreq() returns NULL, indicating
- * that we've been interrupted.
- */
- while (1) {
- bp = afs_get_bioreq(self);
- if (!bp)
- break; /* we were interrupted */
- if (code = setjmpx(&jmpbuf)) {
- /* This should not have happend, maybe a lack of resources */
- s = splimp();
- for (bp1 = bp; bp; bp = bp1) {
- if (bp1)
- bp1 = bp1->b_work;
- bp->b_actf = 0;
- bp->b_error = code;
- bp->b_flags |= B_ERROR;
- iodone(bp);
- }
- splx(s);
- continue;
- }
- vcp = VTOAFS(bp->b_vp);
- if (bp->b_flags & B_PFSTORE) {
- ObtainWriteLock(&vcp->lock, 210);
- if (vcp->v.v_gnode->gn_mwrcnt) {
- afs_offs_t newlength =
- (afs_offs_t) dbtob(bp->b_blkno) + bp->b_bcount;
- if (vcp->m.Length < newlength) {
- afs_Trace4(afs_iclSetp, CM_TRACE_SETLENGTH,
- ICL_TYPE_STRING, __FILE__, ICL_TYPE_LONG,
- __LINE__, ICL_TYPE_OFFSET,
- ICL_HANDLE_OFFSET(vcp->m.Length),
- ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(newlength));
- vcp->m.Length = newlength;
- }
- }
- ReleaseWriteLock(&vcp->lock);
- }
- /* If the buffer represents a protection violation, rather than
- * an actual request for I/O, no special action need be taken.
- */
- if (bp->b_flags & B_PFPROT) {
- iodone(bp); /* Notify all users of the buffer that we're done */
- continue;
- }
- if (DOvmlock)
- ObtainWriteLock(&vcp->pvmlock, 558);
- /*
- * First map its data area to a region in the current address space
- * by calling vm_att with the subspace identifier, and a pointer to
- * the data area. vm_att returns a new data area pointer, but we
- * also want to hang onto the old one.
- */
- tmpaddr = bp->b_baddr;
- bp->b_baddr = vm_att(bp->b_xmemd.subspace_id, tmpaddr);
- tmperr = afs_ustrategy(bp); /* temp variable saves offset calculation */
- if (tmperr) { /* in non-error case */
- bp->b_flags |= B_ERROR; /* should other flags remain set ??? */
- bp->b_error = tmperr;
- }
-
- /* Unmap the buffer's data area by calling vm_det. Reset data area
- * to the value that we saved above.
- */
- vm_det(bp->b_un.b_addr);
- bp->b_baddr = tmpaddr;
-
- /*
- * buffer may be linked with other buffers via the b_work field.
- * See also naix_vm_strategy. For each buffer in the chain (including
- * bp) notify all users of the buffer that the daemon is finished
- * using it by calling iodone.
- * assumes iodone can modify the b_work field.
- */
- for (tbp1 = bp;;) {
- tbp2 = (struct buf *)tbp1->b_work;
- iodone(tbp1);
- if (!tbp2)
- break;
-
- tbp1 = (struct buf *)tbp2->b_work;
- iodone(tbp2);
- if (!tbp1)
- break;
- }
- if (DOvmlock)
- ReleaseWriteLock(&vcp->pvmlock); /* Unlock the vnode. */
- clrjmpx(&jmpbuf);
- } /* infinite loop (unless we're interrupted) */
- unpin(self, sizeof(struct afs_bioqueue));
- afs_osi_Free(self, sizeof(struct afs_bioqueue));
-} /* end of afs_BioDaemon() */
-#endif /* AFS_AIX41_ENV */
-#endif /* AFS_AIX32_ENV */
-
-
-int afs_nbrs = 0;
+#ifdef AFS_NEW_BKG
+int
+afs_BackgroundDaemon(struct afs_uspc_param *uspc, void *param1, void *param2)
+#else
void
afs_BackgroundDaemon(void)
+#endif
{
struct brequest *tb;
int i, foundAny;
AFS_STATCNT(afs_BackgroundDaemon);
/* initialize subsystem */
- if (brsInit == 0) {
- LOCK_INIT(&afs_xbrs, "afs_xbrs");
- memset((char *)afs_brs, 0, sizeof(afs_brs));
- brsInit = 1;
-#if defined (AFS_SGI_ENV) && defined(AFS_SGI_SHORTSTACK)
- /*
- * steal the first daemon for doing delayed DSlot flushing
- * (see afs_GetDownDSlot)
- */
- AFS_GUNLOCK();
- afs_sgidaemon();
- return;
+ if (brsInit == 0)
+ /* Irix with "short stack" exits */
+ afs_BackgroundDaemon_once();
+
+#ifdef AFS_NEW_BKG
+ /* If it's a re-entering syscall, complete the request and release */
+ if (uspc->ts > -1) {
+ tb = afs_brs;
+ for (i = 0; i < NBRS; i++, tb++) {
+ if (tb->ts == uspc->ts) {
+ /* copy the userspace status back in */
+ ((struct afs_uspc_param *) tb->ptr_parm[0])->retval =
+ uspc->retval;
+ /* mark it valid and notify our caller */
+ tb->flags |= BUVALID;
+ if (tb->flags & BUWAIT) {
+ tb->flags &= ~BUWAIT;
+ afs_osi_Wakeup(tb);
+ }
+ brequest_release(tb);
+ break;
+ }
+ }
+ } else {
+ afs_osi_MaskUserLoop();
#endif
+ /* Otherwise it's a new one */
+ afs_nbrs++;
+#ifdef AFS_NEW_BKG
}
- afs_nbrs++;
+#endif
- MObtainWriteLock(&afs_xbrs, 302);
+ ObtainWriteLock(&afs_xbrs, 302);
while (1) {
int min_ts = 0;
struct brequest *min_tb = NULL;
if (afs_termState == AFSOP_STOP_BKG) {
if (--afs_nbrs <= 0)
- afs_termState = AFSOP_STOP_TRUNCDAEMON;
- MReleaseWriteLock(&afs_xbrs);
+ afs_termState = AFSOP_STOP_RXCALLBACK;
+ ReleaseWriteLock(&afs_xbrs);
afs_osi_Wakeup(&afs_termState);
+#ifdef AFS_NEW_BKG
+ return -2;
+#else
return;
+#endif
}
/* find a request */
if ((tb = min_tb)) {
/* claim and process this request */
tb->flags |= BSTARTED;
- MReleaseWriteLock(&afs_xbrs);
+ ReleaseWriteLock(&afs_xbrs);
foundAny = 1;
afs_Trace1(afs_iclSetp, CM_TRACE_BKG1, ICL_TYPE_INT32,
tb->opcode);
if (tb->opcode == BOP_FETCH)
BPrefetch(tb);
+#if defined(AFS_CACHE_BYPASS)
+ else if (tb->opcode == BOP_FETCH_NOCACHE)
+ BPrefetchNoCache(tb);
+#endif
else if (tb->opcode == BOP_STORE)
BStore(tb);
else if (tb->opcode == BOP_PATH)
BPath(tb);
+#ifdef AFS_DARWIN80_ENV
+ else if (tb->opcode == BOP_MOVE) {
+ memcpy(uspc, (struct afs_uspc_param *) tb->ptr_parm[0],
+ sizeof(struct afs_uspc_param));
+ uspc->ts = tb->ts;
+ /* string lengths capped in move vop; copy NUL tho */
+ memcpy(param1, (char *)tb->ptr_parm[1],
+ strlen(tb->ptr_parm[1])+1);
+ memcpy(param2, (char *)tb->ptr_parm[2],
+ strlen(tb->ptr_parm[2])+1);
+ return 0;
+ }
+#endif
+ else if (tb->opcode == BOP_PARTIAL_STORE)
+ BPartialStore(tb);
else
panic("background bop");
- if (tb->vc) {
-#ifdef AFS_DEC_ENV
- tb->vc->vrefCount--; /* fix up reference count */
-#else
- AFS_RELE(AFSTOV(tb->vc)); /* MUST call vnode layer or could lose vnodes */
-#endif
- tb->vc = NULL;
- }
- if (tb->cred) {
- crfree(tb->cred);
- tb->cred = (struct AFS_UCRED *)0;
- }
- afs_BRelease(tb); /* this grabs and releases afs_xbrs lock */
- MObtainWriteLock(&afs_xbrs, 305);
+ brequest_release(tb);
+ ObtainWriteLock(&afs_xbrs, 305);
}
if (!foundAny) {
/* wait for new request */
afs_brsDaemons++;
- MReleaseWriteLock(&afs_xbrs);
+ ReleaseWriteLock(&afs_xbrs);
afs_osi_Sleep(&afs_brsDaemons);
- MObtainWriteLock(&afs_xbrs, 307);
+ ObtainWriteLock(&afs_xbrs, 307);
afs_brsDaemons--;
}
}
+#ifdef AFS_NEW_BKG
+ return -2;
+#endif
}
AFS_STATCNT(shutdown_daemons);
if (afs_cold_shutdown) {
afs_brsDaemons = brsInit = 0;
- rxepoch_checked = afs_nbrs = 0;
- memset((char *)afs_brs, 0, sizeof(afs_brs));
- memset((char *)&afs_xbrs, 0, sizeof(afs_lock_t));
+ afs_nbrs = 0;
+ memset(afs_brs, 0, sizeof(afs_brs));
+ memset(&afs_xbrs, 0, sizeof(afs_lock_t));
afs_brsWaiters = 0;
-#ifdef AFS_AIX32_ENV
#ifdef AFS_AIX41_ENV
lock_free(&afs_asyncbuf_lock);
unpin(&afs_asyncbuf, sizeof(struct buf *));
unpin(&afs_asyncbuf_cv, sizeof(afs_int32));
-#else /* AFS_AIX41_ENV */
- afs_busyq = NULL;
- afs_biodcnt = 0;
- memset((char *)&afs_bioqueue, 0, sizeof(struct afs_bioqueue));
-#endif
afs_initbiod = 0;
#endif
}
SPUNLOCK(afs_sgibklock, s);
AFS_GLOCK();
tdc->dflags &= ~DFEntryMod;
- afs_WriteDCache(tdc, 1);
+ osi_Assert(afs_WriteDCache(tdc, 1) == 0);
AFS_GUNLOCK();
s = SPLOCK(afs_sgibklock);
}
git://git.openafs.org / openafs.git / blobdiff