/*
* 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
/* Copyright (C) 1994 Cazamar Systems, Inc. */
+#include <afsconfig.h>
#include <afs/param.h>
+#include <roken.h>
+
#include <afs/stds.h>
#include <windows.h>
#include <osi.h>
#include <stdio.h>
-#include <assert.h>
#include <strsafe.h>
#include <math.h>
+#include <hcrypto\md5.h>
#include "afsd.h"
#include "cm_memmap.h"
*
* The mutexes in the buffer structures protect the remaining fields in the
* buffers, as well the data itself.
- *
+ *
* The locking hierarchy here is this:
- *
+ *
* - resv multiple simul. buffers reservation
* - lock buffer I/O flags
* - lock buffer's mutex
/* Global lock protecting hash tables and free lists */
osi_rwlock_t buf_globalLock;
+/* Global lock used to limit the number of RDR Release
+ * Extents requests to one. */
+osi_mutex_t buf_rdrReleaseExtentsLock;
+
/* ptr to head of the free list (most recently used) and the
* tail (the guy to remove first). We use osi_Q* functions
* to put stuff in buf_freeListp, and maintain the end
/* set this to 1 when we are terminating to prevent access attempts */
static int buf_ShutdownFlag = 0;
+#ifdef DEBUG_REFCOUNT
+void buf_HoldLockedDbg(cm_buf_t *bp, char *file, long line)
+#else
void buf_HoldLocked(cm_buf_t *bp)
+#endif
{
- osi_assert(bp->magic == CM_BUF_MAGIC);
- bp->refCount++;
+ afs_int32 refCount;
+
+ osi_assertx(bp->magic == CM_BUF_MAGIC,"incorrect cm_buf_t magic");
+ refCount = InterlockedIncrement(&bp->refCount);
+#ifdef DEBUG_REFCOUNT
+ osi_Log2(afsd_logp,"buf_HoldLocked bp 0x%p ref %d",bp, refCount);
+ afsi_log("%s:%d buf_HoldLocked bp 0x%p, ref %d", file, line, bp, refCount);
+#endif
}
/* hold a reference to an already held buffer */
+#ifdef DEBUG_REFCOUNT
+void buf_HoldDbg(cm_buf_t *bp, char *file, long line)
+#else
void buf_Hold(cm_buf_t *bp)
+#endif
{
- lock_ObtainWrite(&buf_globalLock);
- buf_HoldLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
+ afs_int32 refCount;
+
+ lock_ObtainRead(&buf_globalLock);
+ osi_assertx(bp->magic == CM_BUF_MAGIC,"incorrect cm_buf_t magic");
+ refCount = InterlockedIncrement(&bp->refCount);
+#ifdef DEBUG_REFCOUNT
+ osi_Log2(afsd_logp,"buf_Hold bp 0x%p ref %d",bp, refCount);
+ afsi_log("%s:%d buf_Hold bp 0x%p, ref %d", file, line, bp, refCount);
+#endif
+ lock_ReleaseRead(&buf_globalLock);
}
/* code to drop reference count while holding buf_globalLock */
-void buf_ReleaseLocked(cm_buf_t *bp)
+#ifdef DEBUG_REFCOUNT
+void buf_ReleaseLockedDbg(cm_buf_t *bp, afs_uint32 writeLocked, char *file, long line)
+#else
+void buf_ReleaseLocked(cm_buf_t *bp, afs_uint32 writeLocked)
+#endif
{
+ afs_int32 refCount;
+
+ if (writeLocked)
+ lock_AssertWrite(&buf_globalLock);
+ else
+ lock_AssertRead(&buf_globalLock);
+
/* ensure that we're in the LRU queue if our ref count is 0 */
- osi_assert(bp->magic == CM_BUF_MAGIC);
+ osi_assertx(bp->magic == CM_BUF_MAGIC,"incorrect cm_buf_t magic");
+
+ refCount = InterlockedDecrement(&bp->refCount);
+#ifdef DEBUG_REFCOUNT
+ osi_Log3(afsd_logp,"buf_ReleaseLocked %s bp 0x%p ref %d",writeLocked?"write":"read", bp, refCount);
+ afsi_log("%s:%d buf_ReleaseLocked %s bp 0x%p, ref %d", file, line, writeLocked?"write":"read", bp, refCount);
+#endif
#ifdef DEBUG
- if (bp->refCount == 0)
+ if (refCount < 0)
osi_panic("buf refcount 0",__FILE__,__LINE__);;
#else
- osi_assert(bp->refCount > 0);
+ osi_assertx(refCount >= 0, "cm_buf_t refCount == 0");
#endif
- if (--bp->refCount == 0) {
- if (!(bp->flags & CM_BUF_INLRU)) {
- osi_QAdd((osi_queue_t **) &cm_data.buf_freeListp, &bp->q);
-
- /* watch for transition from empty to one element */
- if (!cm_data.buf_freeListEndp)
- cm_data.buf_freeListEndp = cm_data.buf_freeListp;
- bp->flags |= CM_BUF_INLRU;
+ if (refCount == 0) {
+ /*
+ * If we are read locked there could be a race condition
+ * with buf_Find() so we must obtain a write lock and
+ * double check that the refCount is actually zero
+ * before we remove the buffer from the LRU queue.
+ */
+ if (!writeLocked)
+ lock_ConvertRToW(&buf_globalLock);
+
+ if (bp->refCount == 0 &&
+ !(bp->qFlags & (CM_BUF_QINLRU|CM_BUF_QREDIR))) {
+ osi_QAddH( (osi_queue_t **) &cm_data.buf_freeListp,
+ (osi_queue_t **) &cm_data.buf_freeListEndp,
+ &bp->q);
+ _InterlockedOr(&bp->qFlags, CM_BUF_QINLRU);
+ buf_IncrementFreeCount();
}
+
+ if (!writeLocked)
+ lock_ConvertWToR(&buf_globalLock);
}
-}
+}
/* release a buffer. Buffer must be referenced, but unlocked. */
+#ifdef DEBUG_REFCOUNT
+void buf_ReleaseDbg(cm_buf_t *bp, char *file, long line)
+#else
void buf_Release(cm_buf_t *bp)
+#endif
{
- lock_ObtainWrite(&buf_globalLock);
- buf_ReleaseLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
+ afs_int32 refCount;
+
+ /* ensure that we're in the LRU queue if our ref count is 0 */
+ osi_assertx(bp->magic == CM_BUF_MAGIC,"incorrect cm_buf_t magic");
+
+ refCount = InterlockedDecrement(&bp->refCount);
+#ifdef DEBUG_REFCOUNT
+ osi_Log2(afsd_logp,"buf_Release bp 0x%p ref %d", bp, refCount);
+ afsi_log("%s:%d buf_ReleaseLocked bp 0x%p, ref %d", file, line, bp, refCount);
+#endif
+#ifdef DEBUG
+ if (refCount < 0)
+ osi_panic("buf refcount 0",__FILE__,__LINE__);;
+#else
+ osi_assertx(refCount >= 0, "cm_buf_t refCount == 0");
+#endif
+ if (refCount == 0) {
+ lock_ObtainWrite(&buf_globalLock);
+ if (bp->refCount == 0 &&
+ !(bp->qFlags & (CM_BUF_QINLRU|CM_BUF_QREDIR))) {
+ osi_QAddH( (osi_queue_t **) &cm_data.buf_freeListp,
+ (osi_queue_t **) &cm_data.buf_freeListEndp,
+ &bp->q);
+ _InterlockedOr(&bp->qFlags, CM_BUF_QINLRU);
+ buf_IncrementFreeCount();
+ }
+ lock_ReleaseWrite(&buf_globalLock);
+ }
}
-/* incremental sync daemon. Writes all dirty buffers every 5000 ms */
-void buf_IncrSyncer(long parm)
+long
+buf_Sync(int quitOnShutdown)
{
- cm_buf_t **bpp, *bp;
- long i; /* counter */
- long wasDirty = 0;
+ cm_buf_t **bpp, *bp, *prevbp;
+ afs_uint32 wasDirty = 0;
cm_req_t req;
- while (buf_ShutdownFlag == 0) {
- if (!wasDirty) {
- i = SleepEx(5000, 1);
- if (i != 0) continue;
- }
+ /* go through all of the dirty buffers */
+ lock_ObtainRead(&buf_globalLock);
+ for (bpp = &cm_data.buf_dirtyListp, prevbp = NULL; bp = *bpp; ) {
+ if (quitOnShutdown && buf_ShutdownFlag)
+ break;
- wasDirty = 0;
+ /*
+ * If the buffer is held be the redirector we must fetch
+ * it back in order to determine whether or not it is in
+ * fact dirty.
+ */
+ if (bp->qFlags & CM_BUF_QREDIR) {
+ osi_Log1(buf_logp,"buf_Sync buffer held by redirector bp 0x%p", bp);
- /* now go through our percentage of the buffers */
- for (bpp = &cm_data.buf_dirtyListp; bp = *bpp; ) {
+ /* Request single buffer from the redirector */
+ buf_RDRShakeAnExtentFree(bp, &req);
+ }
- /* all dirty buffers are held when they are added to the
- * dirty list. No need for an additional hold.
- */
+ lock_ReleaseRead(&buf_globalLock);
+ /*
+ * all dirty buffers are held when they are added to the
+ * dirty list. No need for an additional hold.
+ */
+ lock_ObtainMutex(&bp->mx);
- if (bp->flags & CM_BUF_DIRTY) {
- /* start cleaning the buffer; don't touch log pages since
- * the log code counts on knowing exactly who is writing
- * a log page at any given instant.
- */
- cm_InitReq(&req);
- req.flags |= CM_REQ_NORETRY;
- wasDirty |= buf_CleanAsync(bp, &req);
- }
+ if ((bp->flags & CM_BUF_DIRTY)) {
+ /* start cleaning the buffer; don't touch log pages since
+ * the log code counts on knowing exactly who is writing
+ * a log page at any given instant.
+ *
+ * only attempt to write the buffer if the volume might
+ * be online.
+ */
+ afs_uint32 dirty;
+ cm_volume_t * volp;
- /* the buffer may or may not have been dirty
- * and if dirty may or may not have been cleaned
- * successfully. check the dirty flag again.
- */
- if (!(bp->flags & CM_BUF_DIRTY)) {
- lock_ObtainMutex(&bp->mx);
- if (!(bp->flags & CM_BUF_DIRTY)) {
- /* remove the buffer from the dirty list */
- lock_ObtainWrite(&buf_globalLock);
- *bpp = bp->dirtyp;
- bp->dirtyp = NULL;
- if (cm_data.buf_dirtyListp == NULL)
- cm_data.buf_dirtyListEndp = NULL;
- buf_ReleaseLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
- } else {
- /* advance the pointer so we don't loop forever */
- bpp = &bp->dirtyp;
- }
- lock_ReleaseMutex(&bp->mx);
- } else {
- /* advance the pointer so we don't loop forever */
- bpp = &bp->dirtyp;
- }
- } /* for loop over a bunch of buffers */
- } /* whole daemon's while loop */
+ volp = cm_GetVolumeByFID(&bp->fid);
+ switch (cm_GetVolumeStatus(volp, bp->fid.volume)) {
+ case vl_online:
+ case vl_unknown:
+ cm_InitReq(&req);
+ req.flags |= CM_REQ_NORETRY;
+ buf_CleanLocked(NULL, bp, &req, 0, &dirty);
+ wasDirty |= dirty;
+ }
+ cm_PutVolume(volp);
+ }
+
+ /* the buffer may or may not have been dirty
+ * and if dirty may or may not have been cleaned
+ * successfully. check the dirty flag again.
+ */
+ if (!(bp->flags & CM_BUF_DIRTY)) {
+ /* remove the buffer from the dirty list */
+ lock_ObtainWrite(&buf_globalLock);
+#ifdef DEBUG_REFCOUNT
+ if (bp->dirtyp == NULL && bp != cm_data.buf_dirtyListEndp) {
+ osi_Log1(afsd_logp,"buf_Sync bp 0x%p list corruption",bp);
+ afsi_log("buf_Sync bp 0x%p list corruption", bp);
+ }
+#endif
+ *bpp = bp->dirtyp;
+ bp->dirtyp = NULL;
+ _InterlockedAnd(&bp->qFlags, ~CM_BUF_QINDL);
+ if (cm_data.buf_dirtyListp == NULL)
+ cm_data.buf_dirtyListEndp = NULL;
+ else if (cm_data.buf_dirtyListEndp == bp)
+ cm_data.buf_dirtyListEndp = prevbp;
+ buf_ReleaseLocked(bp, TRUE);
+ lock_ConvertWToR(&buf_globalLock);
+ } else {
+ if (buf_ShutdownFlag) {
+ cm_cell_t *cellp;
+ cm_volume_t *volp;
+ char volstr[VL_MAXNAMELEN+12]="";
+ char *ext = "";
+
+ volp = cm_GetVolumeByFID(&bp->fid);
+ if (volp) {
+ cellp = volp->cellp;
+ if (bp->fid.volume == volp->vol[RWVOL].ID)
+ ext = "";
+ else if (bp->fid.volume == volp->vol[ROVOL].ID)
+ ext = ".readonly";
+ else if (bp->fid.volume == volp->vol[BACKVOL].ID)
+ ext = ".backup";
+ else
+ ext = ".nomatch";
+ snprintf(volstr, sizeof(volstr), "%s%s", volp->namep, ext);
+ } else {
+ cellp = cm_FindCellByID(bp->fid.cell, CM_FLAG_NOPROBE);
+ snprintf(volstr, sizeof(volstr), "%u", bp->fid.volume);
+ }
+
+ LogEvent(EVENTLOG_INFORMATION_TYPE, MSG_DIRTY_BUFFER_AT_SHUTDOWN,
+ cellp->name, volstr, bp->fid.vnode, bp->fid.unique,
+ bp->offset.QuadPart+bp->dirty_offset, bp->dirty_length);
+ }
+
+ /* advance the pointer so we don't loop forever */
+ lock_ObtainRead(&buf_globalLock);
+ bpp = &bp->dirtyp;
+ prevbp = bp;
+ }
+ lock_ReleaseMutex(&bp->mx);
+ } /* for loop over a bunch of buffers */
+ lock_ReleaseRead(&buf_globalLock);
+
+ return wasDirty;
+}
+
+/* incremental sync daemon. Writes all dirty buffers every 5000 ms */
+static void *
+buf_IncrSyncer(void * parm)
+{
+ long wasDirty = 0;
+ long i;
+
+ while (buf_ShutdownFlag == 0) {
+ if (!wasDirty) {
+ i = SleepEx(5000, 1);
+ if (i != 0)
+ continue;
+ } else {
+ Sleep(50);
+ }
+
+ wasDirty = buf_Sync(1);
+ } /* whole daemon's while loop */
+
+ pthread_exit(NULL);
+ return NULL;
}
long
buf_ValidateBuffers(void)
{
cm_buf_t * bp, *bpf, *bpa, *bpb;
- afs_uint64 countb = 0, countf = 0, counta = 0;
+ afs_uint64 countb = 0, countf = 0, counta = 0, countr = 0;
if (cm_data.buf_freeListp == NULL && cm_data.buf_freeListEndp != NULL ||
cm_data.buf_freeListp != NULL && cm_data.buf_freeListEndp == NULL) {
afsi_log("cm_ValidateBuffers failure: inconsistent free list pointers");
fprintf(stderr, "cm_ValidateBuffers failure: inconsistent free list pointers\n");
- return -9;
+ return -9;
}
- for (bp = cm_data.buf_freeListEndp; bp; bp=(cm_buf_t *) osi_QPrev(&bp->q)) {
+ for (bp = cm_data.buf_freeListEndp; bp; bp=(cm_buf_t *) osi_QPrev(&bp->q)) {
if (bp->magic != CM_BUF_MAGIC) {
afsi_log("cm_ValidateBuffers failure: bp->magic != CM_BUF_MAGIC");
fprintf(stderr, "cm_ValidateBuffers failure: bp->magic != CM_BUF_MAGIC\n");
- return -1;
+ return -1;
}
- countb++;
- bpb = bp;
+ countb++;
+ bpb = bp;
if (countb > cm_data.buf_nbuffers) {
afsi_log("cm_ValidateBuffers failure: countb > cm_data.buf_nbuffers");
fprintf(stderr, "cm_ValidateBuffers failure: countb > cm_data.buf_nbuffers\n");
- return -6;
+ return -6;
}
}
- for (bp = cm_data.buf_freeListp; bp; bp=(cm_buf_t *) osi_QNext(&bp->q)) {
+ for (bp = cm_data.buf_freeListp; bp; bp=(cm_buf_t *) osi_QNext(&bp->q)) {
if (bp->magic != CM_BUF_MAGIC) {
afsi_log("cm_ValidateBuffers failure: bp->magic != CM_BUF_MAGIC");
fprintf(stderr, "cm_ValidateBuffers failure: bp->magic != CM_BUF_MAGIC\n");
- return -2;
+ return -2;
}
- countf++;
- bpf = bp;
+ countf++;
+ bpf = bp;
if (countf > cm_data.buf_nbuffers) {
afsi_log("cm_ValidateBuffers failure: countf > cm_data.buf_nbuffers");
fprintf(stderr, "cm_ValidateBuffers failure: countf > cm_data.buf_nbuffers\n");
return -7;
}
- }
-
- for (bp = cm_data.buf_allp; bp; bp=bp->allp) {
+ }
+
+ for ( bp = cm_data.buf_redirListp; bp; bp = (cm_buf_t *) osi_QNext(&bp->q)) {
+ if (!(bp->qFlags & CM_BUF_QREDIR)) {
+ afsi_log("CM_BUF_QREDIR not set on cm_buf_t in buf_redirListp");
+ fprintf(stderr, "CM_BUF_QREDIR not set on cm_buf_t in buf_redirListp");
+ return -9;
+ }
+ countr++;
+ if (countr > cm_data.buf_nbuffers) {
+ afsi_log("cm_ValidateBuffers failure: countr > cm_data.buf_nbuffers");
+ fprintf(stderr, "cm_ValidateBuffers failure: countr > cm_data.buf_nbuffers\n");
+ return -10;
+ }
+ }
+
+ for (bp = cm_data.buf_allp; bp; bp=bp->allp) {
if (bp->magic != CM_BUF_MAGIC) {
afsi_log("cm_ValidateBuffers failure: bp->magic != CM_BUF_MAGIC");
fprintf(stderr, "cm_ValidateBuffers failure: bp->magic != CM_BUF_MAGIC\n");
- return -3;
+ return -3;
}
- counta++;
- bpa = bp;
+ counta++;
+ bpa = bp;
if (counta > cm_data.buf_nbuffers) {
afsi_log("cm_ValidateBuffers failure: counta > cm_data.buf_nbuffers");
fprintf(stderr, "cm_ValidateBuffers failure: counta > cm_data.buf_nbuffers\n");
- return -8;
+ return -8;
}
- }
-
+ }
+
if (countb != countf) {
afsi_log("cm_ValidateBuffers failure: countb != countf");
fprintf(stderr, "cm_ValidateBuffers failure: countb != countf\n");
- return -4;
+ return -4;
}
-
+
if (counta != cm_data.buf_nbuffers) {
afsi_log("cm_ValidateBuffers failure: counta != cm_data.buf_nbuffers");
fprintf(stderr, "cm_ValidateBuffers failure: counta != cm_data.buf_nbuffers\n");
- return -5;
+ return -5;
}
-
- return 0;
+
+ return 0;
}
-void buf_Shutdown(void)
-{
+void buf_Shutdown(void)
+{
+ /* disable the buf_IncrSyncer() threads */
buf_ShutdownFlag = 1;
-}
+
+ /* then force all dirty buffers to the file servers */
+ buf_Sync(0);
+}
/* initialize the buffer package; called with no locks
* held during the initialization phase.
{
static osi_once_t once;
cm_buf_t *bp;
- thread_t phandle;
+ pthread_t phandle;
+ pthread_attr_t tattr;
+ int pstatus;
long i;
- unsigned long pid;
char *data;
if ( newFile ) {
- if (nbuffers)
+ if (nbuffers)
cm_data.buf_nbuffers = nbuffers;
/* Have to be able to reserve a whole chunk */
if (osi_Once(&once)) {
/* initialize global locks */
- lock_InitializeRWLock(&buf_globalLock, "Global buffer lock");
+ lock_InitializeRWLock(&buf_globalLock, "Global buffer lock", LOCK_HIERARCHY_BUF_GLOBAL);
+ lock_InitializeMutex(&buf_rdrReleaseExtentsLock, "RDR Release Extents lock", LOCK_HIERARCHY_RDR_EXTENTS);
if ( newFile ) {
/* remember this for those who want to reset it */
cm_data.buf_nOrigBuffers = cm_data.buf_nbuffers;
-
+
/* lower hash size to a prime number */
- cm_data.buf_hashSize = osi_PrimeLessThan((afs_uint32)(cm_data.buf_nbuffers/7 + 1));
-
+ cm_data.buf_hashSize = cm_NextHighestPowerOf2((afs_uint32)(cm_data.buf_nbuffers/7));
+
/* create hash table */
memset((void *)cm_data.buf_scacheHashTablepp, 0, cm_data.buf_hashSize * sizeof(cm_buf_t *));
-
+
/* another hash table */
memset((void *)cm_data.buf_fileHashTablepp, 0, cm_data.buf_hashSize * sizeof(cm_buf_t *));
bp = cm_data.bufHeaderBaseAddress;
data = cm_data.bufDataBaseAddress;
cm_data.buf_allp = NULL;
-
+
for (i=0; i<cm_data.buf_nbuffers; i++) {
- osi_assert(bp >= cm_data.bufHeaderBaseAddress && bp < (cm_buf_t *)cm_data.bufDataBaseAddress);
- osi_assert(data >= cm_data.bufDataBaseAddress && data < cm_data.bufEndOfData);
-
+ osi_assertx(bp >= cm_data.bufHeaderBaseAddress && bp < (cm_buf_t *)cm_data.bufDataBaseAddress,
+ "invalid cm_buf_t address");
+ osi_assertx(data >= cm_data.bufDataBaseAddress && data < cm_data.bufEndOfData,
+ "invalid cm_buf_t data address");
+
/* allocate and zero some storage */
memset(bp, 0, sizeof(cm_buf_t));
bp->magic = CM_BUF_MAGIC;
/* thread on list of all buffers */
bp->allp = cm_data.buf_allp;
cm_data.buf_allp = bp;
-
- osi_QAdd((osi_queue_t **)&cm_data.buf_freeListp, &bp->q);
- bp->flags |= CM_BUF_INLRU;
- lock_InitializeMutex(&bp->mx, "Buffer mutex");
-
+
+ osi_QAddH( (osi_queue_t **) &cm_data.buf_freeListp,
+ (osi_queue_t **) &cm_data.buf_freeListEndp,
+ &bp->q);
+ _InterlockedOr(&bp->qFlags, CM_BUF_QINLRU);
+ buf_IncrementFreeCount();
+ lock_InitializeMutex(&bp->mx, "Buffer mutex", LOCK_HIERARCHY_BUFFER);
+
/* grab appropriate number of bytes from aligned zone */
bp->datap = data;
-
- /* setup last buffer pointer */
- if (i == 0)
- cm_data.buf_freeListEndp = bp;
-
+
/* next */
bp++;
data += cm_data.buf_blockSize;
- }
-
+ }
+
/* none reserved at first */
cm_data.buf_reservedBufs = 0;
-
+
/* just for safety's sake */
cm_data.buf_maxReservedBufs = cm_data.buf_nbuffers - 3;
} else {
bp = cm_data.bufHeaderBaseAddress;
data = cm_data.bufDataBaseAddress;
-
+
for (i=0; i<cm_data.buf_nbuffers; i++) {
- lock_InitializeMutex(&bp->mx, "Buffer mutex");
+ lock_InitializeMutex(&bp->mx, "Buffer mutex", LOCK_HIERARCHY_BUFFER);
bp->userp = NULL;
bp->waitCount = 0;
bp->waitRequests = 0;
- bp->flags &= ~CM_BUF_WAITING;
+ _InterlockedAnd(&bp->flags, ~CM_BUF_WAITING);
+ bp->error = 0;
+ if (bp->qFlags & CM_BUF_QREDIR) {
+ /*
+ * extent was not returned by the file system driver.
+ * clean up the mess.
+ */
+ bp->dataVersion = CM_BUF_VERSION_BAD;
+ _InterlockedAnd(&bp->qFlags, ~CM_BUF_QREDIR);
+ osi_QRemoveHT( (osi_queue_t **) &cm_data.buf_redirListp,
+ (osi_queue_t **) &cm_data.buf_redirListEndp,
+ &bp->q);
+ buf_DecrementRedirCount();
+ bp->redirq.nextp = bp->redirq.prevp = NULL;
+ bp->redirLastAccess = 0;
+ bp->redirReleaseRequested = 0;
+ buf_Release(bp);
+ }
bp++;
- }
+ }
+
+ /*
+ * There should be nothing left in cm_data.buf_redirListp
+ * but double check just to be sure.
+ */
+ for ( bp = cm_data.buf_redirListp;
+ bp;
+ bp = cm_data.buf_redirListp)
+ {
+ /*
+ * extent was not returned by the file system driver.
+ * clean up the mess.
+ */
+ bp->dataVersion = CM_BUF_VERSION_BAD;
+ _InterlockedAnd(&bp->qFlags, ~CM_BUF_QREDIR);
+ osi_QRemoveHT( (osi_queue_t **) &cm_data.buf_redirListp,
+ (osi_queue_t **) &cm_data.buf_redirListEndp,
+ &bp->q);
+ buf_DecrementRedirCount();
+ bp->redirq.nextp = bp->redirq.prevp = NULL;
+ bp->redirLastAccess = 0;
+ bp->redirReleaseRequested = 0;
+ buf_Release(bp);
+ }
}
-
+
#ifdef TESTING
buf_ValidateBufQueues();
#endif /* TESTING */
osi_EndOnce(&once);
/* and create the incr-syncer */
- phandle = thrd_Create(0, 0,
- (ThreadFunc) buf_IncrSyncer, 0, 0, &pid,
- "buf_IncrSyncer");
+ pthread_attr_init(&tattr);
+ pthread_attr_setdetachstate(&tattr, PTHREAD_CREATE_DETACHED);
- osi_assertx(phandle != NULL, "buf: can't create incremental sync proc");
- CloseHandle(phandle);
+ pstatus = pthread_create(&phandle, &tattr, buf_IncrSyncer, 0);
+ osi_assertx(pstatus == 0, "buf: can't create incremental sync proc");
+
+ pthread_attr_destroy(&tattr);
}
#ifdef TESTING
{
/* The size of a virtual cache cannot be changed after it has
* been created. Subsequent calls to MapViewofFile() with
- * an existing mapping object name would not allow the
+ * an existing mapping object name would not allow the
* object to be resized. Return failure immediately.
*
* A similar problem now occurs with the persistent cache
nbuffers, cm_data.buf_nbuffers);
return CM_ERROR_INVAL;
-}
+}
/* interface to set the number of buffers to an exact figure.
* Called with no locks held.
*/
long buf_SetNBuffers(afs_uint64 nbuffers)
{
- if (nbuffers < 10)
+ if (nbuffers < 10)
return CM_ERROR_INVAL;
- if (nbuffers == cm_data.buf_nbuffers)
+ if (nbuffers == cm_data.buf_nbuffers)
return 0;
else if (nbuffers > cm_data.buf_nbuffers)
return buf_AddBuffers(nbuffers - cm_data.buf_nbuffers);
- else
+ else
return CM_ERROR_INVAL;
}
int release = 0;
if (scp)
- osi_assert(scp->magic == CM_SCACHE_MAGIC);
- osi_assert(bp->magic == CM_BUF_MAGIC);
+ osi_assertx(scp->magic == CM_SCACHE_MAGIC, "invalid cm_scache_t magic");
+ osi_assertx(bp->magic == CM_BUF_MAGIC, "invalid cm_buf_t magic");
while (1) {
/* if no IO is happening, we're done */
if (!(bp->flags & (CM_BUF_READING | CM_BUF_WRITING)))
break;
-
+
/* otherwise I/O is happening, but some other thread is waiting for
* the I/O already. Wait for that guy to figure out what happened,
* and then check again.
osi_Log1(buf_logp, "buf_WaitIO CM_BUF_WAITING already set for 0x%p", bp);
} else {
osi_Log1(buf_logp, "buf_WaitIO CM_BUF_WAITING set for 0x%p", bp);
- bp->flags |= CM_BUF_WAITING;
+ _InterlockedOr(&bp->flags, CM_BUF_WAITING);
bp->waitCount = bp->waitRequests = 1;
}
osi_SleepM((LONG_PTR)bp, &bp->mx);
- smb_UpdateServerPriority();
+ cm_UpdateServerPriority();
lock_ObtainMutex(&bp->mx);
osi_Log1(buf_logp, "buf_WaitIO conflict wait done for 0x%p", bp);
bp->waitCount--;
if (bp->waitCount == 0) {
osi_Log1(buf_logp, "buf_WaitIO CM_BUF_WAITING reset for 0x%p", bp);
- bp->flags &= ~CM_BUF_WAITING;
+ _InterlockedAnd(&bp->flags, ~CM_BUF_WAITING);
bp->waitRequests = 0;
}
release = 1;
}
if ( scp ) {
- lock_ObtainMutex(&scp->mx);
+ lock_ObtainRead(&scp->rw);
if (scp->flags & CM_SCACHEFLAG_WAITING) {
osi_Log1(buf_logp, "buf_WaitIO waking scp 0x%p", scp);
osi_Wakeup((LONG_PTR)&scp->flags);
}
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseRead(&scp->rw);
}
}
-
+
/* if we get here, the IO is done, but we may have to wakeup people waiting for
* the I/O to complete. Do so.
*/
/* find a buffer, if any, for a particular file ID and offset. Assumes
* that buf_globalLock is write locked when called.
*/
-cm_buf_t *buf_FindLocked(struct cm_scache *scp, osi_hyper_t *offsetp)
+cm_buf_t *buf_FindLocked(struct cm_fid *fidp, osi_hyper_t *offsetp)
{
afs_uint32 i;
cm_buf_t *bp;
- i = BUF_HASH(&scp->fid, offsetp);
+ lock_AssertAny(&buf_globalLock);
+
+ i = BUF_HASH(fidp, offsetp);
for(bp = cm_data.buf_scacheHashTablepp[i]; bp; bp=bp->hashp) {
- if (cm_FidCmp(&scp->fid, &bp->fid) == 0
+ if (cm_FidCmp(fidp, &bp->fid) == 0
&& offsetp->LowPart == bp->offset.LowPart
&& offsetp->HighPart == bp->offset.HighPart) {
buf_HoldLocked(bp);
break;
}
}
-
+
/* return whatever we found, if anything */
return bp;
}
/* find a buffer with offset *offsetp for vnode *scp. Called
* with no locks held.
*/
-cm_buf_t *buf_Find(struct cm_scache *scp, osi_hyper_t *offsetp)
+cm_buf_t *buf_Find(struct cm_fid *fidp, osi_hyper_t *offsetp)
{
cm_buf_t *bp;
- lock_ObtainWrite(&buf_globalLock);
- bp = buf_FindLocked(scp, offsetp);
- lock_ReleaseWrite(&buf_globalLock);
+ lock_ObtainRead(&buf_globalLock);
+ bp = buf_FindLocked(fidp, offsetp);
+ lock_ReleaseRead(&buf_globalLock);
+
+ return bp;
+}
+
+/* find a buffer, if any, for a particular file ID and offset. Assumes
+ * that buf_globalLock is write locked when called. Uses the all buffer
+ * list.
+ */
+cm_buf_t *buf_FindAllLocked(struct cm_fid *fidp, osi_hyper_t *offsetp, afs_uint32 flags)
+{
+ cm_buf_t *bp;
+
+ if (flags == 0) {
+ for(bp = cm_data.buf_allp; bp; bp=bp->allp) {
+ if (cm_FidCmp(fidp, &bp->fid) == 0
+ && offsetp->LowPart == bp->offset.LowPart
+ && offsetp->HighPart == bp->offset.HighPart) {
+ buf_HoldLocked(bp);
+ break;
+ }
+ }
+ } else {
+ for(bp = cm_data.buf_allp; bp; bp=bp->allp) {
+ if (cm_FidCmp(fidp, &bp->fid) == 0) {
+ char * fileOffset;
+
+ fileOffset = offsetp->QuadPart + cm_data.baseAddress;
+ if (fileOffset == bp->datap) {
+ buf_HoldLocked(bp);
+ break;
+ }
+ }
+ }
+ }
+ /* return whatever we found, if anything */
+ return bp;
+}
+
+/* find a buffer with offset *offsetp for vnode *scp. Called
+ * with no locks held. Use the all buffer list.
+ */
+cm_buf_t *buf_FindAll(struct cm_fid *fidp, osi_hyper_t *offsetp, afs_uint32 flags)
+{
+ cm_buf_t *bp;
+
+ lock_ObtainRead(&buf_globalLock);
+ bp = buf_FindAllLocked(fidp, offsetp, flags);
+ lock_ReleaseRead(&buf_globalLock);
return bp;
-}
+}
/* start cleaning I/O on this buffer. Buffer must be write locked, and is returned
* write-locked.
* if this buffer contains logged data.
*
* Returns non-zero if the buffer was dirty.
+ *
+ * 'scp' may or may not be NULL. If it is not NULL, the FID for both cm_scache_t
+ * and cm_buf_t must match.
*/
-long buf_CleanAsyncLocked(cm_buf_t *bp, cm_req_t *reqp)
+afs_uint32 buf_CleanLocked(cm_scache_t *scp, cm_buf_t *bp, cm_req_t *reqp,
+ afs_uint32 flags, afs_uint32 *pisdirty)
{
- long code = 0;
- long isdirty = 0;
- cm_scache_t * scp = NULL;
-
- osi_assert(bp->magic == CM_BUF_MAGIC);
+ afs_uint32 code = 0;
+ afs_uint32 isdirty = 0;
+ osi_hyper_t offset;
+ int release_scp = 0;
+
+ osi_assertx(bp->magic == CM_BUF_MAGIC, "invalid cm_buf_t magic");
+ osi_assertx(scp == NULL || cm_FidCmp(&scp->fid, &bp->fid) == 0, "scp fid != bp fid");
+
+ /*
+ * If the matching cm_scache_t was not provided as a parameter
+ * we must either find one or allocate a new one. It is possible
+ * that the cm_scache_t was recycled out of the cache even though
+ * a cm_buf_t with the same FID is in the cache.
+ */
+ if (scp == NULL) {
+ if ((scp = cm_FindSCache(&bp->fid)) ||
+ (cm_GetSCache(&bp->fid, &scp,
+ bp->userp ? bp->userp : cm_rootUserp,
+ reqp) == 0)) {
+ release_scp = 1;
+ }
+ }
while ((bp->flags & CM_BUF_DIRTY) == CM_BUF_DIRTY) {
- isdirty = 1;
+ isdirty = 1;
lock_ReleaseMutex(&bp->mx);
- scp = cm_FindSCache(&bp->fid);
- if (scp) {
- osi_Log2(buf_logp, "buf_CleanAsyncLocked starts I/O on scp 0x%p buf 0x%p", scp, bp);
- code = (*cm_buf_opsp->Writep)(scp, &bp->offset,
- cm_data.buf_blockSize, 0, bp->userp,
- reqp);
- osi_Log3(buf_logp, "buf_CleanAsyncLocked I/O on scp 0x%p buf 0x%p, done=%d", scp, bp, code);
-
- cm_ReleaseSCache(scp);
- scp = NULL;
- } else {
- osi_Log1(buf_logp, "buf_CleanAsyncLocked unable to start I/O - scp not found buf 0x%p", bp);
- code = CM_ERROR_NOSUCHFILE;
- }
-
- lock_ObtainMutex(&bp->mx);
+ if (!scp) {
+ /*
+ * If we didn't find a cm_scache_t object for bp->fid it means
+ * that we no longer have that FID in the cache. It does not
+ * mean that the object does not exist in the cell. That may
+ * in fact be the case but we don't know that until we attempt
+ * a FetchStatus on the FID.
+ */
+ osi_Log1(buf_logp, "buf_CleanLocked unable to start I/O - scp not found buf 0x%p", bp);
+ code = CM_ERROR_NOSUCHFILE;
+ } else {
+ osi_Log2(buf_logp, "buf_CleanLocked starts I/O on scp 0x%p buf 0x%p", scp, bp);
+
+ offset = bp->offset;
+ LargeIntegerAdd(offset, ConvertLongToLargeInteger(bp->dirty_offset));
+ /*
+ * Only specify the dirty length of the current buffer in the call
+ * to cm_BufWrite(). It is the responsibility of cm_BufWrite()
+ * to determine if it is appropriate to fill a full chunk of data
+ * when storing to the file server.
+ */
+ code = (*cm_buf_opsp->Writep)(scp, &offset,
+ bp->dirty_length,
+ flags, bp->userp, reqp);
+ osi_Log3(buf_logp, "buf_CleanLocked I/O on scp 0x%p buf 0x%p, done=%d", scp, bp, code);
+ }
+ lock_ObtainMutex(&bp->mx);
/* if the Write routine returns No Such File, clear the dirty flag
* because we aren't going to be able to write this data to the file
* server.
*/
- if (code == CM_ERROR_NOSUCHFILE){
- bp->flags &= ~CM_BUF_DIRTY;
- bp->flags |= CM_BUF_ERROR;
- bp->error = CM_ERROR_NOSUCHFILE;
- bp->dataVersion = -1; /* bad */
+ if (code == CM_ERROR_NOSUCHFILE || code == CM_ERROR_BADFD || code == CM_ERROR_NOACCESS ||
+ code == CM_ERROR_QUOTA || code == CM_ERROR_SPACE || code == CM_ERROR_TOOBIG ||
+ code == CM_ERROR_READONLY || code == CM_ERROR_NOSUCHPATH){
+ _InterlockedAnd(&bp->flags, ~CM_BUF_DIRTY);
+ _InterlockedOr(&bp->flags, CM_BUF_ERROR);
+ bp->dirty_offset = 0;
+ bp->dirty_length = 0;
+ bp->error = code;
+ bp->dataVersion = CM_BUF_VERSION_BAD;
bp->dirtyCounter++;
+ break;
}
#ifdef DISKCACHE95
diskcache_Update(bp->dcp, bp->datap, cm_data.buf_blockSize, bp->dataVersion);
#endif /* DISKCACHE95 */
- /* if we get here and retries are not permitted
- * then we need to exit this loop regardless of
+ /* if we get here and retries are not permitted
+ * then we need to exit this loop regardless of
* whether or not we were able to clear the dirty bit
*/
if (reqp->flags & CM_REQ_NORETRY)
break;
- };
-
- if (!(bp->flags & CM_BUF_DIRTY)) {
- /* remove buffer from dirty buffer queue */
+ /* Ditto if the hardDeadTimeout or idleTimeout was reached */
+ if (code == CM_ERROR_TIMEDOUT || code == CM_ERROR_ALLDOWN ||
+ code == CM_ERROR_ALLBUSY || code == CM_ERROR_ALLOFFLINE ||
+ code == CM_ERROR_CLOCKSKEW) {
+ break;
+ }
}
- /* do logging after call to GetLastError, or else */
-
+ if (release_scp)
+ cm_ReleaseSCache(scp);
+
/* if someone was waiting for the I/O that just completed or failed,
* wake them up.
*/
osi_Log1(buf_logp, "buf_WaitIO Waking bp 0x%p", bp);
osi_Wakeup((LONG_PTR) bp);
}
- return isdirty;
+
+ if (pisdirty)
+ *pisdirty = isdirty;
+
+ return code;
}
/* Called with a zero-ref count buffer and with the buf_globalLock write locked.
*/
void buf_Recycle(cm_buf_t *bp)
{
- int i;
+ afs_uint32 i;
cm_buf_t **lbpp;
cm_buf_t *tbp;
cm_buf_t *prevBp, *nextBp;
- osi_assert(bp->magic == CM_BUF_MAGIC);
+ osi_assertx(bp->magic == CM_BUF_MAGIC, "invalid cm_buf_t magic");
+
+ osi_assertx(!(bp->qFlags & CM_BUF_QREDIR), "can't recycle redir held buffers");
/* if we get here, we know that the buffer still has a 0 ref count,
* and that it is clean and has no currently pending I/O. This is
osi_Log3( buf_logp, "buf_Recycle recycles 0x%p, off 0x%x:%08x",
bp, bp->offset.HighPart, bp->offset.LowPart);
- osi_assert(bp->refCount == 0);
- osi_assert(!(bp->flags & (CM_BUF_READING | CM_BUF_WRITING | CM_BUF_DIRTY)));
+ osi_assertx(bp->refCount == 0, "cm_buf_t refcount != 0");
+ osi_assertx(!(bp->flags & (CM_BUF_READING | CM_BUF_WRITING | CM_BUF_DIRTY)),
+ "incorrect cm_buf_t flags");
lock_AssertWrite(&buf_globalLock);
- if (bp->flags & CM_BUF_INHASH) {
+ if (bp->qFlags & CM_BUF_QINHASH) {
/* Remove from hash */
i = BUF_HASH(&bp->fid, &bp->offset);
lbpp = &(cm_data.buf_scacheHashTablepp[i]);
- for(tbp = *lbpp; tbp; lbpp = &tbp->hashp, tbp = *lbpp) {
- if (tbp == bp) break;
+ for(tbp = *lbpp; tbp; lbpp = &tbp->hashp, tbp = tbp->hashp) {
+ if (tbp == bp)
+ break;
}
/* we better find it */
osi_assertx(tbp != NULL, "buf_Recycle: hash table screwup");
*lbpp = bp->hashp; /* hash out */
+ bp->hashp = NULL;
/* Remove from file hash */
i = BUF_FILEHASH(&bp->fid);
prevBp = bp->fileHashBackp;
+ bp->fileHashBackp = NULL;
nextBp = bp->fileHashp;
+ bp->fileHashp = NULL;
if (prevBp)
prevBp->fileHashp = nextBp;
else
if (nextBp)
nextBp->fileHashBackp = prevBp;
- bp->flags &= ~CM_BUF_INHASH;
+ _InterlockedAnd(&bp->qFlags, ~CM_BUF_QINHASH);
}
- /* bump the soft reference counter now, to invalidate softRefs; no
- * wakeup is required since people don't sleep waiting for this
- * counter to change.
- */
- bp->idCounter++;
-
/* make the fid unrecognizable */
memset(&bp->fid, 0, sizeof(cm_fid_t));
-}
+
+ /* clean up junk flags */
+ _InterlockedAnd(&bp->flags, ~(CM_BUF_EOF | CM_BUF_ERROR));
+ bp->dataVersion = CM_BUF_VERSION_BAD; /* unknown so far */
+}
+
+
+/*
+ * buf_RDRShakeAnExtentFree
+ * called with buf_globalLock read locked
+ */
+afs_uint32
+buf_RDRShakeAnExtentFree(cm_buf_t *rbp, cm_req_t *reqp)
+{
+ afs_uint32 code = 0;
+ LARGE_INTEGER heldExtents = {0,0};
+ AFSFileExtentCB extentList[1];
+ DWORD extentCount = 0;
+ BOOL locked = FALSE;
+
+ if (!(rbp->qFlags & CM_BUF_QREDIR))
+ return 0;
+
+ lock_ReleaseRead(&buf_globalLock);
+
+ if (!lock_TryMutex(&buf_rdrReleaseExtentsLock)) {
+ osi_Log0(afsd_logp, "Waiting for prior RDR_RequestExtentRelease request to complete");
+ if (reqp->flags & CM_REQ_NORETRY) {
+ code = CM_ERROR_WOULDBLOCK;
+ goto done;
+ }
+
+ lock_ObtainMutex(&buf_rdrReleaseExtentsLock);
+ }
+
+ extentList[0].Flags = 0;
+ extentList[0].Length = cm_data.blockSize;
+ extentList[0].FileOffset.QuadPart = rbp->offset.QuadPart;
+ extentList[0].CacheOffset.QuadPart = rbp->datap - cm_data.baseAddress;
+ extentCount = 1;
+
+ code = RDR_RequestExtentRelease(&rbp->fid, heldExtents, extentCount, extentList);
+
+ lock_ReleaseMutex(&buf_rdrReleaseExtentsLock);
+
+ done:
+ lock_ObtainRead(&buf_globalLock);
+ return code;
+}
+
+/*
+ * buf_RDRShakeFileExtentsFree
+ * requests all extents held by the redirector to be returned for
+ * the specified cm_scache_t. This function is called with no
+ * locks held.
+ */
+afs_uint32
+buf_RDRShakeFileExtentsFree(cm_scache_t *rscp, cm_req_t *reqp)
+{
+ afs_uint32 code = 0;
+ afs_uint64 n_redir = 0;
+
+ if (!lock_TryMutex(&buf_rdrReleaseExtentsLock)) {
+ osi_Log0(afsd_logp, "Waiting for prior RDR_RequestExtentRelease request to complete");
+ if (reqp->flags & CM_REQ_NORETRY)
+ return CM_ERROR_WOULDBLOCK;
+
+ lock_ObtainMutex(&buf_rdrReleaseExtentsLock);
+ }
+
+ for ( code = CM_ERROR_RETRY; code == CM_ERROR_RETRY; ) {
+ LARGE_INTEGER heldExtents = {0,0};
+ AFSFileExtentCB extentList[1024];
+ DWORD extentCount = 0;
+ cm_buf_t *srbp;
+ time_t now;
+
+ /* only retry if a call to RDR_RequestExtentRelease says to */
+ code = 0;
+ lock_ObtainWrite(&buf_globalLock);
+
+ if (rscp->redirBufCount == 0)
+ {
+ lock_ReleaseWrite(&buf_globalLock);
+ break;
+ }
+
+ time(&now);
+ for ( srbp = redirq_to_cm_buf_t(rscp->redirQueueT);
+ srbp;
+ srbp = ((code == 0 && extentCount == 0) ? redirq_to_cm_buf_t(rscp->redirQueueT) :
+ redirq_to_cm_buf_t(osi_QPrev(&srbp->redirq))))
+ {
+ extentList[extentCount].Flags = 0;
+ extentList[extentCount].Length = cm_data.blockSize;
+ extentList[extentCount].FileOffset.QuadPart = srbp->offset.QuadPart;
+ extentList[extentCount].CacheOffset.QuadPart = srbp->datap - cm_data.baseAddress;
+ srbp->redirReleaseRequested = now;
+ extentCount++;
+
+ if (extentCount == 1024) {
+ lock_ReleaseWrite(&buf_globalLock);
+ heldExtents.QuadPart = cm_data.buf_redirCount;
+ code = RDR_RequestExtentRelease(&rscp->fid, heldExtents, extentCount, extentList);
+ if (code) {
+ if (code == CM_ERROR_RETRY) {
+ /*
+ * The redirector either is not holding the extents or cannot let them
+ * go because they are otherwise in use. At the moment, do nothing.
+ */
+ } else
+ break;
+ }
+ extentCount = 0;
+ lock_ObtainWrite(&buf_globalLock);
+ }
+ }
+ lock_ReleaseWrite(&buf_globalLock);
+
+ if (code == 0 && extentCount > 0) {
+ heldExtents.QuadPart = cm_data.buf_redirCount;
+ code = RDR_RequestExtentRelease(&rscp->fid, heldExtents, extentCount, extentList);
+ }
+
+ if ((code == CM_ERROR_RETRY) && (reqp->flags & CM_REQ_NORETRY)) {
+ code = CM_ERROR_WOULDBLOCK;
+ break;
+ }
+ }
+ lock_ReleaseMutex(&buf_rdrReleaseExtentsLock);
+ return code;
+}
+
+afs_uint32
+buf_RDRShakeSomeExtentsFree(cm_req_t *reqp, afs_uint32 oneFid, afs_uint32 minage)
+{
+ afs_uint32 code = 0;
+
+ if (!lock_TryMutex(&buf_rdrReleaseExtentsLock)) {
+ if (reqp->flags & CM_REQ_NORETRY)
+ return CM_ERROR_WOULDBLOCK;
+
+ osi_Log0(afsd_logp, "Waiting for prior RDR_RequestExtentRelease request to complete");
+ lock_ObtainMutex(&buf_rdrReleaseExtentsLock);
+ }
+
+ for ( code = CM_ERROR_RETRY; code == CM_ERROR_RETRY; ) {
+ LARGE_INTEGER heldExtents;
+ AFSFileExtentCB extentList[1024];
+ DWORD extentCount = 0;
+ cm_buf_t *rbp, *srbp;
+ cm_scache_t *rscp;
+ time_t now;
+ BOOL locked = FALSE;
+
+ /* only retry if a call to RDR_RequestExtentRelease says to */
+ code = 0;
+ lock_ObtainWrite(&buf_globalLock);
+ locked = TRUE;
+
+ for ( rbp = cm_data.buf_redirListEndp;
+ code == 0 && rbp && (!oneFid || extentCount == 0);
+ rbp = (cm_buf_t *) osi_QPrev(&rbp->q))
+ {
+ if (!oneFid)
+ extentCount = 0;
+
+ if (rbp->redirLastAccess >= rbp->redirReleaseRequested) {
+ rscp = cm_FindSCache(&rbp->fid);
+ if (!rscp)
+ continue;
+
+ time(&now);
+ for ( srbp = redirq_to_cm_buf_t(rscp->redirQueueT);
+ srbp && extentCount < 1024;
+ srbp = redirq_to_cm_buf_t(osi_QPrev(&srbp->redirq)))
+ {
+ /*
+ * Do not request a release if we have already done so
+ * or if the extent was delivered to windows less than
+ * 'minage' seconds ago.
+ */
+ if (srbp->redirLastAccess >= srbp->redirReleaseRequested &&
+ srbp->redirLastAccess < now - minage) {
+ extentList[extentCount].Flags = 0;
+ extentList[extentCount].Length = cm_data.blockSize;
+ extentList[extentCount].FileOffset.QuadPart = srbp->offset.QuadPart;
+ extentList[extentCount].CacheOffset.QuadPart = srbp->datap - cm_data.baseAddress;
+ srbp->redirReleaseRequested = now;
+ extentCount++;
+ }
+ }
+ cm_ReleaseSCache(rscp);
+ }
+
+ if ( !oneFid && extentCount > 0) {
+ if (locked) {
+ lock_ReleaseWrite(&buf_globalLock);
+ locked = FALSE;
+ }
+ heldExtents.QuadPart = cm_data.buf_redirCount;
+ code = RDR_RequestExtentRelease(&rbp->fid, heldExtents, extentCount, extentList);
+ }
+ if (!locked) {
+ lock_ObtainWrite(&buf_globalLock);
+ locked = TRUE;
+ }
+ }
+ if (locked)
+ lock_ReleaseWrite(&buf_globalLock);
+ if (code == 0) {
+ if (oneFid) {
+ heldExtents.QuadPart = cm_data.buf_redirCount;
+ if (rbp && extentCount)
+ code = RDR_RequestExtentRelease(&rbp->fid, heldExtents, extentCount, extentList);
+ else
+ code = RDR_RequestExtentRelease(NULL, heldExtents, 1024, NULL);
+ } else {
+ code = 0;
+ }
+ }
+
+ if ((code == CM_ERROR_RETRY) && (reqp->flags & CM_REQ_NORETRY)) {
+ code = CM_ERROR_WOULDBLOCK;
+ break;
+ }
+ }
+ lock_ReleaseMutex(&buf_rdrReleaseExtentsLock);
+ return code;
+}
+
+/* returns 0 if the buffer does not exist, and non-0 if it does */
+static long
+buf_ExistsLocked(struct cm_scache *scp, osi_hyper_t *offsetp)
+{
+ cm_buf_t *bp;
+
+ if (bp = buf_FindLocked(&scp->fid, offsetp)) {
+ /* Do not call buf_ReleaseLocked() because we
+ * do not want to allow the buffer to be added
+ * to the free list.
+ */
+ afs_int32 refCount = InterlockedDecrement(&bp->refCount);
+#ifdef DEBUG_REFCOUNT
+ osi_Log2(afsd_logp,"buf_ExistsLocked bp 0x%p ref %d", bp, refCount);
+ afsi_log("%s:%d buf_ExistsLocked bp 0x%p, ref %d", __FILE__, __LINE__, bp, refCount);
+#endif
+ return CM_BUF_EXISTS;
+ }
+
+ return 0;
+}
/* recycle a buffer, removing it from the free list, hashing in its new identity
* and returning it write-locked so that no one can use it. Called without
- * any locks held, and can return an error if it loses the race condition and
+ * any locks held, and can return an error if it loses the race condition and
* finds that someone else created the desired buffer.
*
* If success is returned, the buffer is returned write-locked.
* space from the buffer pool. In that case, the buffer will be returned
* without being hashed into the hash table.
*/
-long buf_GetNewLocked(struct cm_scache *scp, osi_hyper_t *offsetp, cm_buf_t **bufpp)
+long buf_GetNewLocked(struct cm_scache *scp, osi_hyper_t *offsetp, cm_req_t *reqp, cm_buf_t **bufpp)
{
- cm_buf_t *bp; /* buffer we're dealing with */
+ cm_buf_t *bp; /* buffer we're dealing with */
cm_buf_t *nextBp; /* next buffer in file hash chain */
- long i; /* temp */
- cm_req_t req;
-
- cm_InitReq(&req); /* just in case */
+ afs_uint32 i; /* temp */
+ afs_uint64 n_bufs, n_nonzero, n_busy, n_dirty, n_own;
#ifdef TESTING
buf_ValidateBufQueues();
while(1) {
retry:
+ n_bufs = 0;
+ n_nonzero = 0;
+ n_own = 0;
+ n_busy = 0;
+ n_dirty = 0;
+
+ lock_ObtainRead(&scp->bufCreateLock);
lock_ObtainWrite(&buf_globalLock);
/* check to see if we lost the race */
- if (scp) {
- if (bp = buf_FindLocked(scp, offsetp)) {
- /* Do not call buf_ReleaseLocked() because we
- * do not want to allow the buffer to be added
- * to the free list.
- */
- bp->refCount--;
- lock_ReleaseWrite(&buf_globalLock);
- return CM_BUF_EXISTS;
- }
+ if (buf_ExistsLocked(scp, offsetp)) {
+ lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&scp->bufCreateLock);
+ return CM_BUF_EXISTS;
}
/* does this fix the problem below? it's a simple solution. */
if (!cm_data.buf_freeListEndp)
{
lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&scp->bufCreateLock);
+
+ if ( RDR_Initialized )
+ goto rdr_release;
+
osi_Log0(afsd_logp, "buf_GetNewLocked: Free Buffer List is empty - sleeping 200ms");
Sleep(200);
goto retry;
* starting cleaning I/O for those which are dirty. If we find
* a clean buffer, we rehash it, lock it and return it.
*/
- for(bp = cm_data.buf_freeListEndp; bp; bp=(cm_buf_t *) osi_QPrev(&bp->q)) {
+ for (bp = cm_data.buf_freeListEndp; bp; bp=(cm_buf_t *) osi_QPrev(&bp->q)) {
+ n_bufs++;
+
/* check to see if it really has zero ref count. This
* code can bump refcounts, at least, so it may not be
* zero.
*/
- if (bp->refCount > 0)
+ if (bp->refCount > 0) {
+ n_nonzero++;
continue;
-
+ }
+
/* we don't have to lock buffer itself, since the ref
* count is 0 and we know it will stay zero as long as
* we hold the global lock.
*/
/* don't recycle someone in our own chunk */
- if (!cm_FidCmp(&bp->fid, &scp->fid)
- && (bp->offset.LowPart & (-cm_chunkSize))
- == (offsetp->LowPart & (-cm_chunkSize)))
+ if (!cm_FidCmp(&bp->fid, &scp->fid) &&
+ bp->dataVersion >= scp->bufDataVersionLow &&
+ bp->dataVersion <= scp->dataVersion &&
+ (bp->offset.LowPart & (-cm_chunkSize)) == (offsetp->LowPart & (-cm_chunkSize))) {
+ n_own++;
continue;
+ }
/* if this page is being filled (!) or cleaned, see if
* the I/O has completed. If not, skip it, otherwise
* holding the big lock? Watch for contention
* here.
*/
+ n_busy++;
continue;
}
-
+
if (bp->flags & CM_BUF_DIRTY) {
+ n_dirty++;
+
+ /* leave the buffer alone if held by the redirector */
+ if (bp->qFlags & CM_BUF_QREDIR)
+ continue;
+
/* if the buffer is dirty, start cleaning it and
* move on to the next buffer. We do this with
* just the lock required to minimize contention
*/
buf_HoldLocked(bp);
lock_ReleaseWrite(&buf_globalLock);
-
- /* grab required lock and clean; this only
- * starts the I/O. By the time we're back,
- * it'll still be marked dirty, but it will also
- * have the WRITING flag set, so we won't get
- * back here.
+ lock_ReleaseRead(&scp->bufCreateLock);
+
+ /*
+ * grab required lock and clean.
+ * previously the claim was that the cleaning
+ * operation was async which it is not. It would
+ * be a good idea to use an async mechanism here
+ * but there is none at the moment other than
+ * the buf_IncrSyncer() thread.
*/
- buf_CleanAsync(bp, &req);
+ if (cm_FidCmp(&scp->fid, &bp->fid) == 0)
+ buf_Clean(scp, bp, reqp, 0, NULL);
+ else
+ buf_Clean(NULL, bp, reqp, 0, NULL);
/* now put it back and go around again */
buf_Release(bp);
- goto retry;
+
+ /* but first obtain the locks we gave up
+ * before the buf_CleanAsync() call */
+ lock_ObtainRead(&scp->bufCreateLock);
+ lock_ObtainWrite(&buf_globalLock);
+
+ /*
+ * Since we dropped the locks we need to verify that
+ * another thread has not allocated the buffer for us.
+ */
+ if (buf_ExistsLocked(scp, offsetp)) {
+ lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&scp->bufCreateLock);
+ return CM_BUF_EXISTS;
+ }
+ continue;
}
+ osi_Log3(afsd_logp, "buf_GetNewLocked: scp 0x%p examined %u buffers before recycling bufp 0x%p",
+ scp, n_bufs, bp);
+ osi_Log4(afsd_logp, "... nonzero %u; own %u; busy %u; dirty %u", n_nonzero, n_own, n_busy, n_dirty);
+
/* if we get here, we know that the buffer still has a 0
* ref count, and that it is clean and has no currently
* pending I/O. This is the dude to return.
*/
buf_Recycle(bp);
- /* clean up junk flags */
- bp->flags &= ~(CM_BUF_EOF | CM_BUF_ERROR);
- bp->dataVersion = -1; /* unknown so far */
-
/* now hash in as our new buffer, and give it the
* appropriate label, if requested.
*/
if (scp) {
- bp->flags |= CM_BUF_INHASH;
+ lock_AssertWrite(&buf_globalLock);
+
+ _InterlockedOr(&bp->qFlags, CM_BUF_QINHASH);
bp->fid = scp->fid;
#ifdef DEBUG
bp->scp = scp;
cm_data.buf_fileHashTablepp[i] = bp;
}
- /* we should move it from the lru queue. It better still be there,
+ /* we should remove it from the lru queue. It better still be there,
* since we've held the global (big) lock since we found it there.
*/
- osi_assertx(bp->flags & CM_BUF_INLRU,
+ osi_assertx(bp->qFlags & CM_BUF_QINLRU,
"buf_GetNewLocked: LRU screwup");
- if (cm_data.buf_freeListEndp == bp) {
- /* we're the last guy in this queue, so maintain it */
- cm_data.buf_freeListEndp = (cm_buf_t *) osi_QPrev(&bp->q);
- }
- osi_QRemove((osi_queue_t **) &cm_data.buf_freeListp, &bp->q);
- bp->flags &= ~CM_BUF_INLRU;
+ osi_QRemoveHT( (osi_queue_t **) &cm_data.buf_freeListp,
+ (osi_queue_t **) &cm_data.buf_freeListEndp,
+ &bp->q);
+ _InterlockedAnd(&bp->qFlags, ~CM_BUF_QINLRU);
+ buf_DecrementFreeCount();
+ /* prepare to return it. Give it a refcount */
+ bp->refCount = 1;
+#ifdef DEBUG_REFCOUNT
+ osi_Log2(afsd_logp,"buf_GetNewLocked bp 0x%p ref %d", bp, 1);
+ afsi_log("%s:%d buf_GetNewLocked bp 0x%p, ref %d", __FILE__, __LINE__, bp, 1);
+#endif
/* grab the mutex so that people don't use it
- * before the caller fills it with data. Again, no one
+ * before the caller fills it with data. Again, no one
* should have been able to get to this dude to lock it.
*/
if (!lock_TryMutex(&bp->mx)) {
osi_Log2(afsd_logp, "buf_GetNewLocked bp 0x%p cannot be mutex locked. refCount %d should be 0",
- bp, bp->refCount);
+ bp, bp->refCount);
osi_panic("buf_GetNewLocked: TryMutex failed",__FILE__,__LINE__);
}
- /* prepare to return it. Give it a refcount */
- bp->refCount = 1;
-
lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&scp->bufCreateLock);
+
*bufpp = bp;
#ifdef TESTING
return 0;
} /* for all buffers in lru queue */
lock_ReleaseWrite(&buf_globalLock);
- osi_Log0(afsd_logp, "buf_GetNewLocked: Free Buffer List has no buffers with a zero refcount - sleeping 100ms");
- Sleep(100); /* give some time for a buffer to be freed */
- } /* while loop over everything */
- /* not reached */
-} /* the proc */
-
-/* get a page, returning it held but unlocked. Doesn't fill in the page
- * with I/O, since we're going to write the whole thing new.
- */
-long buf_GetNew(struct cm_scache *scp, osi_hyper_t *offsetp, cm_buf_t **bufpp)
-{
- cm_buf_t *bp;
- long code;
- osi_hyper_t pageOffset;
- int created;
-
- created = 0;
- pageOffset.HighPart = offsetp->HighPart;
- pageOffset.LowPart = offsetp->LowPart & ~(cm_data.buf_blockSize-1);
- while (1) {
- bp = buf_Find(scp, &pageOffset);
- if (bp) {
- /* lock it and break out */
- lock_ObtainMutex(&bp->mx);
- break;
- }
-
- /* otherwise, we have to create a page */
- code = buf_GetNewLocked(scp, &pageOffset, &bp);
-
- /* check if the buffer was created in a race condition branch.
- * If so, go around so we can hold a reference to it.
- */
- if (code == CM_BUF_EXISTS)
- continue;
-
- /* something else went wrong */
- if (code != 0)
- return code;
-
- /* otherwise, we have a locked buffer that we just created */
- created = 1;
- break;
- } /* big while loop */
-
- /* wait for reads */
- if (bp->flags & CM_BUF_READING)
- buf_WaitIO(scp, bp);
+ lock_ReleaseRead(&scp->bufCreateLock);
+
+ osi_Log1(afsd_logp, "buf_GetNewLocked: Free Buffer List has %u buffers none free", n_bufs);
+ osi_Log4(afsd_logp, "... nonzero %u; own %u; busy %u; dirty %u", n_nonzero, n_own, n_busy, n_dirty);
+
+ if (RDR_Initialized) {
+ afs_uint32 code;
+ rdr_release:
+ code = buf_RDRShakeSomeExtentsFree(reqp, TRUE, 2 /* seconds */);
+ switch (code) {
+ case CM_ERROR_RETRY:
+ case 0:
+ goto retry;
+ case CM_ERROR_WOULDBLOCK:
+ return CM_ERROR_WOULDBLOCK;
+ }
+ }
- /* once it has been read once, we can unlock it and return it, still
- * with its refcount held.
- */
- lock_ReleaseMutex(&bp->mx);
- *bufpp = bp;
- osi_Log4(buf_logp, "buf_GetNew returning bp 0x%p for scp 0x%p, offset 0x%x:%08x",
- bp, scp, offsetp->HighPart, offsetp->LowPart);
- return 0;
-}
+ Sleep(100); /* give some time for a buffer to be freed */
+ } /* while loop over everything */
+ /* not reached */
+} /* the proc */
-/* get a page, returning it held but unlocked. Make sure it is complete */
-/* The scp must be unlocked when passed to this function */
-long buf_Get(struct cm_scache *scp, osi_hyper_t *offsetp, cm_buf_t **bufpp)
+/*
+ * get a page, returning it held but unlocked. the page may or may not
+ * contain valid data.
+ *
+ * The scp must be unlocked when passed in unlocked.
+ */
+long buf_Get(struct cm_scache *scp, osi_hyper_t *offsetp, cm_req_t *reqp, cm_buf_t **bufpp)
{
cm_buf_t *bp;
long code;
created = 0;
pageOffset.HighPart = offsetp->HighPart;
pageOffset.LowPart = offsetp->LowPart & ~(cm_data.buf_blockSize-1);
- while (1) {
+ while (!created) {
lcount++;
#ifdef TESTING
buf_ValidateBufQueues();
#endif /* TESTING */
- bp = buf_Find(scp, &pageOffset);
+ bp = buf_Find(&scp->fid, &pageOffset);
if (bp) {
/* lock it and break out */
lock_ObtainMutex(&bp->mx);
}
/* otherwise, we have to create a page */
- code = buf_GetNewLocked(scp, &pageOffset, &bp);
- /* bp->mx is now held */
-
- /* check if the buffer was created in a race condition branch.
- * If so, go around so we can hold a reference to it.
- */
- if (code == CM_BUF_EXISTS)
- continue;
-
- /* something else went wrong */
- if (code != 0) {
+ code = buf_GetNewLocked(scp, &pageOffset, reqp, &bp);
+ switch (code) {
+ case 0:
+ /* the requested buffer was created */
+ created = 1;
+ break;
+ case CM_BUF_EXISTS:
+ /*
+ * the requested buffer existed by the time the
+ * scp->bufCreateLock and buf_globalLock could be obtained.
+ * loop again and permit buf_Find() to obtain a reference.
+ */
+ break;
+ default:
+ /*
+ * the requested buffer could not be created.
+ * return the error to the caller.
+ */
#ifdef TESTING
buf_ValidateBufQueues();
#endif /* TESTING */
return code;
}
-
- /* otherwise, we have a locked buffer that we just created */
- created = 1;
- break;
} /* big while loop */
/* if we get here, we have a locked buffer that may have just been
*/
if (created) {
/* load the page; freshly created pages should be idle */
- osi_assert(!(bp->flags & (CM_BUF_READING | CM_BUF_WRITING)));
-
- /* setup offset, event */
- bp->over.Offset = bp->offset.LowPart;
- bp->over.OffsetHigh = bp->offset.HighPart;
+ osi_assertx(!(bp->flags & (CM_BUF_READING | CM_BUF_WRITING)), "incorrect cm_buf_t flags");
- /* start the I/O; may drop lock */
- bp->flags |= CM_BUF_READING;
+ /*
+ * start the I/O; may drop lock. as of this writing, the only
+ * implementation of Readp is cm_BufRead() which simply sets
+ * tcount to 0 and returns success.
+ */
+ _InterlockedOr(&bp->flags, CM_BUF_READING);
code = (*cm_buf_opsp->Readp)(bp, cm_data.buf_blockSize, &tcount, NULL);
#ifdef DISKCACHE95
if (code != 0) {
/* failure or queued */
+
+ /* unless cm_BufRead() is altered, this path cannot be hit */
if (code != ERROR_IO_PENDING) {
bp->error = code;
- bp->flags |= CM_BUF_ERROR;
- bp->flags &= ~CM_BUF_READING;
+ _InterlockedOr(&bp->flags, CM_BUF_ERROR);
+ _InterlockedAnd(&bp->flags, ~CM_BUF_READING);
if (bp->flags & CM_BUF_WAITING) {
osi_Log1(buf_logp, "buf_Get Waking bp 0x%p", bp);
osi_Wakeup((LONG_PTR) bp);
return code;
}
} else {
- /* otherwise, I/O completed instantly and we're done, except
+ /*
+ * otherwise, I/O completed instantly and we're done, except
* for padding the xfr out with 0s and checking for EOF
*/
if (tcount < (unsigned long) cm_data.buf_blockSize) {
memset(bp->datap+tcount, 0, cm_data.buf_blockSize - tcount);
if (tcount == 0)
- bp->flags |= CM_BUF_EOF;
+ _InterlockedOr(&bp->flags, CM_BUF_EOF);
}
- bp->flags &= ~CM_BUF_READING;
+ _InterlockedAnd(&bp->flags, ~CM_BUF_READING);
if (bp->flags & CM_BUF_WAITING) {
osi_Log1(buf_logp, "buf_Get Waking bp 0x%p", bp);
osi_Wakeup((LONG_PTR) bp);
}
}
-
} /* if created */
/* wait for reads, either that which we started above, or that someone
* being recycled) when we're done in buf_Release.
*/
lock_ObtainWrite(&buf_globalLock);
- if (bp->flags & CM_BUF_INLRU) {
- if (cm_data.buf_freeListEndp == bp)
- cm_data.buf_freeListEndp = (cm_buf_t *) osi_QPrev(&bp->q);
- osi_QRemove((osi_queue_t **) &cm_data.buf_freeListp, &bp->q);
- bp->flags &= ~CM_BUF_INLRU;
+ if (bp->qFlags & CM_BUF_QINLRU) {
+ osi_QRemoveHT( (osi_queue_t **) &cm_data.buf_freeListp,
+ (osi_queue_t **) &cm_data.buf_freeListEndp,
+ &bp->q);
+ _InterlockedAnd(&bp->qFlags, ~CM_BUF_QINLRU);
+ buf_DecrementFreeCount();
}
lock_ReleaseWrite(&buf_globalLock);
return 0;
}
-/* count # of elements in the free list;
- * we don't bother doing the proper locking for accessing dataVersion or flags
- * since it is a pain, and this is really just an advisory call. If you need
- * to do better at some point, rewrite this function.
- */
-long buf_CountFreeList(void)
-{
- long count;
- cm_buf_t *bufp;
-
- count = 0;
- lock_ObtainRead(&buf_globalLock);
- for(bufp = cm_data.buf_freeListp; bufp; bufp = (cm_buf_t *) osi_QNext(&bufp->q)) {
- /* if the buffer doesn't have an identity, or if the buffer
- * has been invalidate (by having its DV stomped upon), then
- * count it as free, since it isn't really being utilized.
- */
- if (!(bufp->flags & CM_BUF_INHASH) || bufp->dataVersion <= 0)
- count++;
- }
- lock_ReleaseRead(&buf_globalLock);
- return count;
-}
-
/* clean a buffer synchronously */
-long buf_CleanAsync(cm_buf_t *bp, cm_req_t *reqp)
+afs_uint32 buf_Clean(cm_scache_t *scp, cm_buf_t *bp, cm_req_t *reqp, afs_uint32 flags, afs_uint32 *pisdirty)
{
long code;
- osi_assert(bp->magic == CM_BUF_MAGIC);
+ osi_assertx(bp->magic == CM_BUF_MAGIC, "invalid cm_buf_t magic");
+ osi_assertx(!(flags & CM_BUF_WRITE_SCP_LOCKED), "scp->rw must not be held when calling buf_CleanAsync");
lock_ObtainMutex(&bp->mx);
- code = buf_CleanAsyncLocked(bp, reqp);
+ code = buf_CleanLocked(scp, bp, reqp, flags, pisdirty);
lock_ReleaseMutex(&bp->mx);
return code;
-}
+}
/* wait for a buffer's cleaning to finish */
-void buf_CleanWait(cm_scache_t * scp, cm_buf_t *bp)
+void buf_CleanWait(cm_scache_t * scp, cm_buf_t *bp, afs_uint32 locked)
{
- osi_assert(bp->magic == CM_BUF_MAGIC);
+ osi_assertx(bp->magic == CM_BUF_MAGIC, "invalid cm_buf_t magic");
- lock_ObtainMutex(&bp->mx);
+ if (!locked)
+ lock_ObtainMutex(&bp->mx);
if (bp->flags & CM_BUF_WRITING) {
buf_WaitIO(scp, bp);
}
- lock_ReleaseMutex(&bp->mx);
-}
+ if (!locked)
+ lock_ReleaseMutex(&bp->mx);
+}
/* set the dirty flag on a buffer, and set associated write-ahead log,
* if there is one. Allow one to be added to a buffer, but not changed.
*
* The buffer must be locked before calling this routine.
*/
-void buf_SetDirty(cm_buf_t *bp)
+void buf_SetDirty(cm_buf_t *bp, cm_req_t *reqp, afs_uint32 offset, afs_uint32 length, cm_user_t *userp)
{
- osi_assert(bp->magic == CM_BUF_MAGIC);
- osi_assert(bp->refCount > 0);
-
+ osi_assertx(bp->magic == CM_BUF_MAGIC, "invalid cm_buf_t magic");
+ osi_assertx(bp->refCount > 0, "cm_buf_t refcount 0");
+
+ if (length == 0)
+ return;
+
if (bp->flags & CM_BUF_DIRTY) {
+
osi_Log1(buf_logp, "buf_SetDirty 0x%p already dirty", bp);
+
+ if (bp->dirty_offset <= offset) {
+ if (bp->dirty_offset + bp->dirty_length >= offset + length) {
+ /* dirty_length remains the same */
+ } else {
+ bp->dirty_length = offset + length - bp->dirty_offset;
+ }
+ } else /* bp->dirty_offset > offset */ {
+ if (bp->dirty_offset + bp->dirty_length >= offset + length) {
+ bp->dirty_length = bp->dirty_offset + bp->dirty_length - offset;
+ } else {
+ bp->dirty_length = length;
+ }
+ bp->dirty_offset = offset;
+ }
} else {
osi_Log1(buf_logp, "buf_SetDirty 0x%p", bp);
- }
- /* set dirty bit */
- bp->flags |= CM_BUF_DIRTY;
- /* and turn off EOF flag, since it has associated data now */
- bp->flags &= ~CM_BUF_EOF;
+ /* set dirty bit */
+ _InterlockedOr(&bp->flags, CM_BUF_DIRTY);
+
+ /* and turn off EOF flag, since it has associated data now */
+ _InterlockedAnd(&bp->flags, ~CM_BUF_EOF);
+
+ bp->dirty_offset = offset;
+ bp->dirty_length = length;
+
+ /*
+ * if the request is not from the afs redirector,
+ * add to the dirty list. The redirector interface ensures
+ * that a background store operation is queued for each and
+ * every dirty extent that is released. Therefore, the
+ * buf_IncrSyncer thread is not required to ensure that
+ * dirty buffers are written to the file server.
+ *
+ * we obtain a hold on the buffer for as long as it remains
+ * in the list. buffers are only removed from the list by
+ * the buf_IncrSyncer function regardless of when else the
+ * dirty flag might be cleared.
+ *
+ * This should never happen but just in case there is a bug
+ * elsewhere, never add to the dirty list if the buffer is
+ * already there.
+ */
+ if (!(reqp->flags & CM_REQ_SOURCE_REDIR)) {
+ lock_ObtainWrite(&buf_globalLock);
+ if (!(bp->qFlags & CM_BUF_QINDL)) {
+ buf_HoldLocked(bp);
+ if (!cm_data.buf_dirtyListp) {
+ cm_data.buf_dirtyListp = cm_data.buf_dirtyListEndp = bp;
+ } else {
+ cm_data.buf_dirtyListEndp->dirtyp = bp;
+ cm_data.buf_dirtyListEndp = bp;
+ }
+ bp->dirtyp = NULL;
+ _InterlockedOr(&bp->qFlags, CM_BUF_QINDL);
+ }
+ lock_ReleaseWrite(&buf_globalLock);
+ }
+ }
- /* and add to the dirty list.
- * we obtain a hold on the buffer for as long as it remains
- * in the list. buffers are only removed from the list by
- * the buf_IncrSyncer function regardless of when else the
- * dirty flag might be cleared.
- *
- * This should never happen but just in case there is a bug
- * elsewhere, never add to the dirty list if the buffer is
- * already there.
- */
- lock_ObtainWrite(&buf_globalLock);
- if (bp->dirtyp == NULL && cm_data.buf_dirtyListEndp != bp) {
- buf_HoldLocked(bp);
- if (!cm_data.buf_dirtyListp) {
- cm_data.buf_dirtyListp = cm_data.buf_dirtyListEndp = bp;
- } else {
- cm_data.buf_dirtyListEndp->dirtyp = bp;
- cm_data.buf_dirtyListEndp = bp;
- }
- bp->dirtyp = NULL;
+ /* and record the last writer */
+ if (bp->userp != userp) {
+ cm_HoldUser(userp);
+ if (bp->userp)
+ cm_ReleaseUser(bp->userp);
+ bp->userp = userp;
}
- lock_ReleaseWrite(&buf_globalLock);
}
/* clean all buffers, reset log pointers and invalidate all buffers.
cm_buf_t *bp;
cm_req_t req;
- lock_ObtainWrite(&buf_globalLock);
+ lock_ObtainRead(&buf_globalLock);
for(i=0; i<cm_data.buf_hashSize; i++) {
for(bp = cm_data.buf_scacheHashTablepp[i]; bp; bp = bp->hashp) {
+ if (bp->qFlags & CM_BUF_QREDIR) {
+ osi_Log1(buf_logp,"buf_CleanAndReset buffer held by redirector bp 0x%p", bp);
+
+ /* Request single extent from the redirector */
+ buf_RDRShakeAnExtentFree(bp, &req);
+ }
+
if ((bp->flags & CM_BUF_DIRTY) == CM_BUF_DIRTY) {
buf_HoldLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&buf_globalLock);
/* now no locks are held; clean buffer and go on */
cm_InitReq(&req);
req.flags |= CM_REQ_NORETRY;
- buf_CleanAsync(bp, &req);
- buf_CleanWait(NULL, bp);
+ buf_Clean(NULL, bp, &req, 0, NULL);
+ buf_CleanWait(NULL, bp, FALSE);
/* relock and release buffer */
- lock_ObtainWrite(&buf_globalLock);
- buf_ReleaseLocked(bp);
+ lock_ObtainRead(&buf_globalLock);
+ buf_ReleaseLocked(bp, FALSE);
} /* dirty */
} /* over one bucket */
} /* for loop over all hash buckets */
/* release locks */
- lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&buf_globalLock);
#ifdef TESTING
buf_ValidateBufQueues();
#endif /* TESTING */
-
+
/* and we're done */
return 0;
-}
+}
/* called without global lock being held, reserves buffers for callers
* that need more than one held (not locked) at once.
}
lock_ReleaseWrite(&buf_globalLock);
return code;
-}
+}
/* called without global lock held, releases reservation held by
* buf_ReserveBuffers.
osi_Wakeup((LONG_PTR) &cm_data.buf_reservedBufs);
}
lock_ReleaseWrite(&buf_globalLock);
-}
+}
/* truncate the buffers past sizep, zeroing out the page, if we don't
* end on a page boundary.
osi_hyper_t bufEnd;
long code;
long bufferPos;
- long i;
+ afs_uint32 i;
+ afs_uint32 invalidate = 0;
/* assert that cm_bufCreateLock is held in write mode */
lock_AssertWrite(&scp->bufCreateLock);
i = BUF_FILEHASH(&scp->fid);
- lock_ObtainWrite(&buf_globalLock);
+ lock_ObtainRead(&buf_globalLock);
bufp = cm_data.buf_fileHashTablepp[i];
if (bufp == NULL) {
- lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&buf_globalLock);
return 0;
}
buf_HoldLocked(bufp);
- lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&buf_globalLock);
+
while (bufp) {
lock_ObtainMutex(&bufp->mx);
LargeIntegerLessThan(*sizep, bufEnd)) {
buf_WaitIO(scp, bufp);
}
- lock_ObtainMutex(&scp->mx);
-
+ lock_ObtainWrite(&scp->rw);
+
/* make sure we have a callback (so we have the right value for
* the length), and wait for it to be safe to do a truncate.
*/
| CM_SCACHESYNC_SETSIZE
| CM_SCACHESYNC_BUFLOCKED);
-
- lock_ObtainWrite(&buf_globalLock);
+
/* if we succeeded in our locking, and this applies to the right
* file, and the truncate request overlaps the buffer either
* totally or partially, then do something.
*/
if (LargeIntegerLessThanOrEqualTo(*sizep, bufp->offset)) {
/* truncating the entire page */
- bufp->flags &= ~CM_BUF_DIRTY;
- bufp->dataVersion = -1; /* known bad */
+ if (reqp->flags & CM_REQ_SOURCE_REDIR) {
+ /*
+ * Implicitly clear the redirector flag
+ * and release the matching hold.
+ */
+ if (bufp->qFlags & CM_BUF_QREDIR) {
+ osi_Log4(buf_logp,"buf_Truncate taking from file system bufp 0x%p vno 0x%x foffset 0x%x:%x",
+ bufp, bufp->fid.vnode, bufp->offset.HighPart, bufp->offset.LowPart);
+ lock_ObtainWrite(&buf_globalLock);
+ if (bufp->qFlags & CM_BUF_QREDIR) {
+ buf_RemoveFromRedirQueue(scp, bufp);
+ buf_ReleaseLocked(bufp, TRUE);
+ }
+ lock_ReleaseWrite(&buf_globalLock);
+ }
+ } else {
+ invalidate = 1;
+ }
+ _InterlockedAnd(&bufp->flags, ~CM_BUF_DIRTY);
+ bufp->error = 0;
+ bufp->dirty_offset = 0;
+ bufp->dirty_length = 0;
+ bufp->dataVersion = CM_BUF_VERSION_BAD; /* known bad */
bufp->dirtyCounter++;
}
else {
* visible again.
*/
bufferPos = sizep->LowPart & (cm_data.buf_blockSize - 1);
- osi_assert(bufferPos != 0);
+ osi_assertx(bufferPos != 0, "non-zero bufferPos");
memset(bufp->datap + bufferPos, 0,
cm_data.buf_blockSize - bufferPos);
}
}
-
- cm_SyncOpDone( scp, bufp,
+
+ cm_SyncOpDone( scp, bufp,
CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS
| CM_SCACHESYNC_SETSIZE | CM_SCACHESYNC_BUFLOCKED);
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
lock_ReleaseMutex(&bufp->mx);
-
+
if (!code) {
nbufp = bufp->fileHashp;
- if (nbufp)
- buf_HoldLocked(nbufp);
+ if (nbufp)
+ buf_Hold(nbufp);
} else {
/* This forces the loop to end and the error code
* to be returned. */
nbufp = NULL;
}
- buf_ReleaseLocked(bufp);
- lock_ReleaseWrite(&buf_globalLock);
+ buf_Release(bufp);
bufp = nbufp;
}
buf_ValidateBufQueues();
#endif /* TESTING */
+ if (invalidate && RDR_Initialized)
+ RDR_InvalidateObject(scp->fid.cell, scp->fid.volume, scp->fid.vnode,
+ scp->fid.unique, scp->fid.hash,
+ scp->fileType, AFS_INVALIDATE_SMB);
+
/* done */
return code;
}
cm_buf_t *bp; /* buffer we're hacking on */
cm_buf_t *nbp;
int didRelease;
- long i;
+ afs_uint32 i;
+ afs_uint32 stable = 0;
i = BUF_FILEHASH(&scp->fid);
code = 0;
- lock_ObtainWrite(&buf_globalLock);
+ lock_ObtainRead(&buf_globalLock);
bp = cm_data.buf_fileHashTablepp[i];
- if (bp)
+ if (bp)
buf_HoldLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
-
+ lock_ReleaseRead(&buf_globalLock);
+
for (; bp; bp = nbp) {
didRelease = 0; /* haven't released this buffer yet */
/* clean buffer synchronously */
if (cm_FidCmp(&bp->fid, &scp->fid) == 0) {
- lock_ObtainMutex(&bp->mx);
- /* start cleaning the buffer, and wait for it to finish */
- buf_CleanAsyncLocked(bp, reqp);
- buf_WaitIO(scp, bp);
- lock_ReleaseMutex(&bp->mx);
+ if (code == 0 && !stable && (bp->flags & CM_BUF_DIRTY)) {
+ /*
+ * we must stabilize the object to ensure that buffer
+ * changes cannot occur while the flush is performed.
+ * However, we do not want to Stabilize if we do not
+ * need to because Stabilize obtains a callback.
+ */
+ code = (*cm_buf_opsp->Stabilizep)(scp, userp, reqp);
+ stable = (code == 0);
+ }
- code = (*cm_buf_opsp->Stabilizep)(scp, userp, reqp);
- if (code)
- goto skip;
+ if (code == CM_ERROR_BADFD) {
+ /* if the scp's FID is bad its because we received VNOVNODE
+ * when attempting to FetchStatus before the write. This
+ * page therefore contains data that can no longer be stored.
+ */
+ lock_ObtainMutex(&bp->mx);
+ _InterlockedAnd(&bp->flags, ~CM_BUF_DIRTY);
+ _InterlockedOr(&bp->flags, CM_BUF_ERROR);
+ bp->error = CM_ERROR_BADFD;
+ bp->dirty_offset = 0;
+ bp->dirty_length = 0;
+ bp->dataVersion = CM_BUF_VERSION_BAD; /* known bad */
+ bp->dirtyCounter++;
+ lock_ReleaseMutex(&bp->mx);
+ } else if (!(scp->flags & CM_SCACHEFLAG_RO)) {
+ if (code) {
+ goto skip;
+ }
+
+ lock_ObtainMutex(&bp->mx);
+
+ /* start cleaning the buffer, and wait for it to finish */
+ buf_CleanLocked(scp, bp, reqp, 0, NULL);
+ buf_WaitIO(scp, bp);
+
+ lock_ReleaseMutex(&bp->mx);
+ }
- lock_ObtainWrite(&buf_globalLock);
/* actually, we only know that buffer is clean if ref
* count is 1, since we don't have buffer itself locked.
*/
- if (!(bp->flags & CM_BUF_DIRTY)) {
- if (bp->refCount == 1) { /* bp is held above */
- nbp = bp->fileHashp;
- if (nbp)
- buf_HoldLocked(nbp);
- buf_ReleaseLocked(bp);
- didRelease = 1;
- buf_Recycle(bp);
+ if (!(bp->flags & CM_BUF_DIRTY) && !(bp->qFlags & CM_BUF_QREDIR)) {
+ lock_ObtainWrite(&buf_globalLock);
+ if (!(bp->flags & CM_BUF_DIRTY) && !(bp->qFlags & CM_BUF_QREDIR)) {
+ if (bp->refCount == 1) { /* bp is held above */
+ nbp = bp->fileHashp;
+ if (nbp)
+ buf_HoldLocked(nbp);
+ buf_ReleaseLocked(bp, TRUE);
+ didRelease = 1;
+ buf_Recycle(bp);
+ }
}
+ lock_ReleaseWrite(&buf_globalLock);
}
- lock_ReleaseWrite(&buf_globalLock);
-
- (*cm_buf_opsp->Unstabilizep)(scp, userp);
}
skip:
if (!didRelease) {
- lock_ObtainWrite(&buf_globalLock);
+ lock_ObtainRead(&buf_globalLock);
nbp = bp->fileHashp;
if (nbp)
buf_HoldLocked(nbp);
- buf_ReleaseLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
+ buf_ReleaseLocked(bp, FALSE);
+ lock_ReleaseRead(&buf_globalLock);
}
} /* for loop over a bunch of buffers */
+ if (stable)
+ (*cm_buf_opsp->Unstabilizep)(scp, userp);
+
#ifdef TESTING
buf_ValidateBufQueues();
#endif /* TESTING */
/* done */
return code;
-}
+}
+
+/* Must be called with scp->rw held */
+long buf_ForceDataVersion(cm_scache_t * scp, afs_uint64 fromVersion, afs_uint64 toVersion)
+{
+ cm_buf_t * bp;
+ afs_uint32 i;
+ int found = 0;
+
+ lock_AssertAny(&scp->rw);
+
+ i = BUF_FILEHASH(&scp->fid);
+
+ lock_ObtainRead(&buf_globalLock);
+
+ for (bp = cm_data.buf_fileHashTablepp[i]; bp; bp = bp->fileHashp) {
+ if (cm_FidCmp(&bp->fid, &scp->fid) == 0) {
+ if (bp->dataVersion == fromVersion) {
+ bp->dataVersion = toVersion;
+ found = 1;
+ }
+ }
+ }
+ lock_ReleaseRead(&buf_globalLock);
+
+ if (found)
+ return 0;
+ else
+ return ENOENT;
+}
long buf_CleanVnode(struct cm_scache *scp, cm_user_t *userp, cm_req_t *reqp)
{
long wasDirty = 0;
cm_buf_t *bp; /* buffer we're hacking on */
cm_buf_t *nbp; /* next one */
- long i;
+ afs_uint32 i;
+
+ if (RDR_Initialized && scp->redirBufCount > 0) {
+ /* Retrieve all extents for this file from the redirector */
+ buf_RDRShakeFileExtentsFree(scp, reqp);
+ }
i = BUF_FILEHASH(&scp->fid);
- lock_ObtainWrite(&buf_globalLock);
+ lock_ObtainRead(&buf_globalLock);
bp = cm_data.buf_fileHashTablepp[i];
- if (bp)
+ if (bp)
buf_HoldLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseRead(&buf_globalLock);
for (; bp; bp = nbp) {
/* clean buffer synchronously */
if (cm_FidCmp(&bp->fid, &scp->fid) == 0) {
- if (userp) {
- cm_HoldUser(userp);
- lock_ObtainMutex(&bp->mx);
- if (bp->userp)
- cm_ReleaseUser(bp->userp);
- bp->userp = userp;
- lock_ReleaseMutex(&bp->mx);
- }
- wasDirty = buf_CleanAsync(bp, reqp);
- buf_CleanWait(scp, bp);
+ /*
+ * If the buffer is held by the redirector we must fetch
+ * it back in order to determine whether or not it is in
+ * fact dirty.
+ */
+ lock_ObtainRead(&buf_globalLock);
+ if (bp->qFlags & CM_BUF_QREDIR) {
+ osi_Log1(buf_logp,"buf_CleanVnode buffer held by redirector bp 0x%p", bp);
+
+ /* Retrieve single extent from the redirector */
+ buf_RDRShakeAnExtentFree(bp, reqp);
+ }
+ lock_ReleaseRead(&buf_globalLock);
+
lock_ObtainMutex(&bp->mx);
- if (bp->flags & CM_BUF_ERROR) {
- code = bp->error;
- if (code == 0)
- code = -1;
+ if ((bp->flags & CM_BUF_DIRTY)) {
+ if (userp && userp != bp->userp) {
+ cm_HoldUser(userp);
+ if (bp->userp)
+ cm_ReleaseUser(bp->userp);
+ bp->userp = userp;
+ }
+
+ switch (code) {
+ case CM_ERROR_NOSUCHFILE:
+ case CM_ERROR_BADFD:
+ case CM_ERROR_NOACCESS:
+ case CM_ERROR_QUOTA:
+ case CM_ERROR_SPACE:
+ case CM_ERROR_TOOBIG:
+ case CM_ERROR_READONLY:
+ case CM_ERROR_NOSUCHPATH:
+ /*
+ * Apply the previous fatal error to this buffer.
+ * Do not waste the time attempting to store to
+ * the file server when we know it will fail.
+ */
+ _InterlockedAnd(&bp->flags, ~CM_BUF_DIRTY);
+ _InterlockedOr(&bp->flags, CM_BUF_ERROR);
+ bp->dirty_offset = 0;
+ bp->dirty_length = 0;
+ bp->error = code;
+ bp->dataVersion = CM_BUF_VERSION_BAD;
+ bp->dirtyCounter++;
+ break;
+ case CM_ERROR_TIMEDOUT:
+ case CM_ERROR_ALLDOWN:
+ case CM_ERROR_ALLBUSY:
+ case CM_ERROR_ALLOFFLINE:
+ case CM_ERROR_CLOCKSKEW:
+ /* do not mark the buffer in error state but do
+ * not attempt to complete the rest either.
+ */
+ break;
+ default:
+ code = buf_CleanLocked(scp, bp, reqp, 0, &wasDirty);
+ if (bp->flags & CM_BUF_ERROR) {
+ code = bp->error;
+ if (code == 0)
+ code = -1;
+ }
+ }
+ buf_CleanWait(scp, bp, TRUE);
}
lock_ReleaseMutex(&bp->mx);
}
- lock_ObtainWrite(&buf_globalLock);
+ lock_ObtainRead(&buf_globalLock);
nbp = bp->fileHashp;
- if (nbp)
+ if (nbp)
buf_HoldLocked(nbp);
- buf_ReleaseLocked(bp);
- lock_ReleaseWrite(&buf_globalLock);
+ buf_ReleaseLocked(bp, FALSE);
+ lock_ReleaseRead(&buf_globalLock);
} /* for loop over a bunch of buffers */
#ifdef TESTING
cm_buf_t *bp;
char output[1024];
afs_uint32 i;
-
+
if (cm_data.buf_scacheHashTablepp == NULL)
return -1;
if (lock)
lock_ObtainRead(&buf_globalLock);
-
- StringCbPrintfA(output, sizeof(output), "%s - dumping buf_HashTable - buf_hashSize=%d\r\n",
+
+ StringCbPrintfA(output, sizeof(output), "%s - dumping buf_HashTable - buf_hashSize=%d\r\n",
cookie, cm_data.buf_hashSize);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
-
+
for (i = 0; i < cm_data.buf_hashSize; i++)
{
- for (bp = cm_data.buf_scacheHashTablepp[i]; bp; bp=bp->hashp)
+ for (bp = cm_data.buf_scacheHashTablepp[i]; bp; bp=bp->hashp)
{
- StringCbPrintfA(output, sizeof(output),
+ StringCbPrintfA(output, sizeof(output),
"%s bp=0x%08X, hash=%d, fid (cell=%d, volume=%d, "
- "vnode=%d, unique=%d), offset=%x:%08x, dv=%d, "
- "flags=0x%x, cmFlags=0x%x, refCount=%d\r\n",
- cookie, (void *)bp, i, bp->fid.cell, bp->fid.volume,
- bp->fid.vnode, bp->fid.unique, bp->offset.HighPart,
- bp->offset.LowPart, bp->dataVersion, bp->flags,
- bp->cmFlags, bp->refCount);
+ "vnode=%d, unique=%d), offset=%x:%08x, dv=%I64d, "
+ "flags=0x%x, qFlags=0x%x cmFlags=0x%x, error=0x%x, refCount=%d\r\n",
+ cookie, (void *)bp, i, bp->fid.cell, bp->fid.volume,
+ bp->fid.vnode, bp->fid.unique, bp->offset.HighPart,
+ bp->offset.LowPart, bp->dataVersion, bp->flags, bp->qFlags,
+ bp->cmFlags, bp->error, bp->refCount);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
}
}
-
+
StringCbPrintfA(output, sizeof(output), "%s - Done dumping buf_HashTable.\r\n", cookie);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
StringCbPrintfA(output, sizeof(output), "%s - dumping buf_freeListEndp\r\n", cookie);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
for(bp = cm_data.buf_freeListEndp; bp; bp=(cm_buf_t *) osi_QPrev(&bp->q)) {
- StringCbPrintfA(output, sizeof(output),
+ StringCbPrintfA(output, sizeof(output),
"%s bp=0x%08X, fid (cell=%d, volume=%d, "
- "vnode=%d, unique=%d), offset=%x:%08x, dv=%d, "
- "flags=0x%x, cmFlags=0x%x, refCount=%d\r\n",
- cookie, (void *)bp, bp->fid.cell, bp->fid.volume,
- bp->fid.vnode, bp->fid.unique, bp->offset.HighPart,
- bp->offset.LowPart, bp->dataVersion, bp->flags,
- bp->cmFlags, bp->refCount);
+ "vnode=%d, unique=%d), offset=%x:%08x, dv=%I64d, "
+ "flags=0x%x, qFlags=0x%x, cmFlags=0x%x, error=0x%x, refCount=%d\r\n",
+ cookie, (void *)bp, bp->fid.cell, bp->fid.volume,
+ bp->fid.vnode, bp->fid.unique, bp->offset.HighPart,
+ bp->offset.LowPart, bp->dataVersion, bp->flags, bp->qFlags,
+ bp->cmFlags, bp->error, bp->refCount);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
}
StringCbPrintfA(output, sizeof(output), "%s - Done dumping buf_FreeListEndp.\r\n", cookie);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
- StringCbPrintfA(output, sizeof(output), "%s - dumping buf_dirtyListEndp\r\n", cookie);
+ StringCbPrintfA(output, sizeof(output), "%s - dumping buf_dirtyListp\r\n", cookie);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
- for(bp = cm_data.buf_dirtyListEndp; bp; bp=(cm_buf_t *) osi_QPrev(&bp->q)) {
- StringCbPrintfA(output, sizeof(output),
+ for(bp = cm_data.buf_dirtyListp; bp; bp=bp->dirtyp) {
+ StringCbPrintfA(output, sizeof(output),
"%s bp=0x%08X, fid (cell=%d, volume=%d, "
- "vnode=%d, unique=%d), offset=%x:%08x, dv=%d, "
- "flags=0x%x, cmFlags=0x%x, refCount=%d\r\n",
- cookie, (void *)bp, bp->fid.cell, bp->fid.volume,
- bp->fid.vnode, bp->fid.unique, bp->offset.HighPart,
- bp->offset.LowPart, bp->dataVersion, bp->flags,
- bp->cmFlags, bp->refCount);
+ "vnode=%d, unique=%d), offset=%x:%08x, dv=%I64d, "
+ "flags=0x%x, qFlags=0x%x, cmFlags=0x%x, error=0x%x, refCount=%d\r\n",
+ cookie, (void *)bp, bp->fid.cell, bp->fid.volume,
+ bp->fid.vnode, bp->fid.unique, bp->offset.HighPart,
+ bp->offset.LowPart, bp->dataVersion, bp->flags, bp->qFlags,
+ bp->cmFlags, bp->error, bp->refCount);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
}
- StringCbPrintfA(output, sizeof(output), "%s - Done dumping buf_dirtyListEndp.\r\n", cookie);
+ StringCbPrintfA(output, sizeof(output), "%s - Done dumping buf_dirtyListp.\r\n", cookie);
WriteFile(outputFile, output, (DWORD)strlen(output), &zilch, NULL);
if (lock)
int len;
char buf[256];
- if (!buf_logp)
+ if (!buf_logp)
return;
len = GetTempPath(sizeof(buf)-10, buf);
{
cm_buf_t *bp;
afs_uint32 bcount = 0;
+ afs_uint32 i;
+ long found = 0;
+
+ i = BUF_FILEHASH(fidp);
+
+ lock_ObtainRead(&buf_globalLock);
+ for (bp = cm_data.buf_fileHashTablepp[i]; bp; bp=bp->fileHashp, bcount++) {
+ if (!cm_FidCmp(fidp, &bp->fid) && (bp->flags & CM_BUF_DIRTY)) {
+ found = 1;
+ break;
+ }
+ }
+ lock_ReleaseRead(&buf_globalLock);
+ return 0;
+}
+
+long buf_RDRBuffersExist(cm_fid_t *fidp)
+{
+ cm_buf_t *bp;
+ afs_uint32 bcount = 0;
+ afs_uint32 i;
+ long found = 0;
+
+ if (!RDR_Initialized)
+ return 0;
+
+ i = BUF_FILEHASH(fidp);
+
+ lock_ObtainRead(&buf_globalLock);
+ for (bp = cm_data.buf_fileHashTablepp[i]; bp; bp=bp->fileHashp, bcount++) {
+ if (!cm_FidCmp(fidp, &bp->fid) && (bp->qFlags & CM_BUF_QREDIR)) {
+ found = 1;
+ break;
+ }
+ }
+ lock_ReleaseRead(&buf_globalLock);
+ return 0;
+}
+
+long buf_ClearRDRFlag(cm_scache_t *scp, char *reason)
+{
+ cm_fid_t *fidp = &scp->fid;
+ cm_buf_t *bp;
+ afs_uint32 bcount = 0;
+ afs_uint32 i;
+
+ i = BUF_FILEHASH(fidp);
+
+ lock_ObtainWrite(&scp->rw);
+ lock_ObtainRead(&buf_globalLock);
+ for (bp = cm_data.buf_fileHashTablepp[i]; bp; bp=bp->fileHashp, bcount++) {
+ if (!cm_FidCmp(fidp, &bp->fid) && (bp->qFlags & CM_BUF_QREDIR)) {
+ lock_ConvertRToW(&buf_globalLock);
+ if (bp->qFlags & CM_BUF_QREDIR) {
+ osi_Log4(buf_logp,"buf_ClearRDRFlag taking from file system bp 0x%p vno 0x%x foffset 0x%x:%x",
+ bp, bp->fid.vnode, bp->offset.HighPart, bp->offset.LowPart);
+ buf_RemoveFromRedirQueue(scp, bp);
+ buf_ReleaseLocked(bp, TRUE);
+ }
+ lock_ConvertWToR(&buf_globalLock);
+ }
+ }
+
+ /* Confirm that there are none left */
+ lock_ConvertRToW(&buf_globalLock);
+ for ( bp = redirq_to_cm_buf_t(scp->redirQueueT);
+ bp;
+ bp = redirq_to_cm_buf_t(scp->redirQueueT))
+ {
+ if (bp->qFlags & CM_BUF_QREDIR) {
+ osi_Log4(buf_logp,"buf_ClearRDRFlag taking from file system bufp 0x%p vno 0x%x foffset 0x%x:%x",
+ bp, bp->fid.vnode, bp->offset.HighPart, bp->offset.LowPart);
+ buf_RemoveFromRedirQueue(scp, bp);
+ buf_ReleaseLocked(bp, TRUE);
+ }
- for (bp = cm_data.buf_allp; bp; bp=bp->allp, bcount++) {
- if (!cm_FidCmp(fidp, &bp->fid) && (bp->flags & CM_BUF_DIRTY))
- return 1;
}
+ lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseWrite(&scp->rw);
return 0;
}
for (bp = cm_data.buf_allp; bp; bp=bp->allp, bcount++) {
if (!cm_FidCmp(fidp, &bp->fid) && (bp->flags & CM_BUF_DIRTY)) {
- buf_Hold(bp);
+ buf_Hold(bp);
lock_ObtainMutex(&bp->mx);
- bp->cmFlags &= ~CM_BUF_CMSTORING;
- bp->flags &= ~CM_BUF_DIRTY;
- bp->flags |= CM_BUF_ERROR;
+ _InterlockedAnd(&bp->cmFlags, ~CM_BUF_CMSTORING);
+ _InterlockedAnd(&bp->flags, ~CM_BUF_DIRTY);
+ bp->dirty_offset = 0;
+ bp->dirty_length = 0;
+ _InterlockedOr(&bp->flags, CM_BUF_ERROR);
bp->error = VNOVNODE;
- bp->dataVersion = -1; /* bad */
+ bp->dataVersion = CM_BUF_VERSION_BAD; /* bad */
bp->dirtyCounter++;
if (bp->flags & CM_BUF_WAITING) {
osi_Log2(buf_logp, "BUF CleanDirtyBuffers Waking [scp 0x%x] bp 0x%x", scp, bp);
return 0;
}
#endif
+
+/*
+ * The following routines will not be used on a
+ * regular basis but are very useful in a variety
+ * of scenarios when debugging data corruption.
+ */
+const char *
+buf_HexCheckSum(cm_buf_t * bp)
+{
+ int i, k;
+ static char buf[33];
+ static char tr[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
+
+ for (i=0;i<16;i++) {
+ k = bp->md5cksum[i];
+
+ buf[i*2] = tr[k / 16];
+ buf[i*2+1] = tr[k % 16];
+ }
+ buf[32] = '\0';
+
+ return buf;
+}
+
+void
+buf_ComputeCheckSum(cm_buf_t * bp)
+{
+ MD5_CTX md5;
+
+ MD5_Init(&md5);
+ MD5_Update(&md5, bp->datap, cm_data.blockSize);
+ MD5_Final(bp->md5cksum, &md5);
+
+ osi_Log4(buf_logp, "CheckSum bp 0x%p md5 %s, dirty: offset %u length %u",
+ bp, osi_LogSaveString(buf_logp, buf_HexCheckSum(bp)),
+ bp->dirty_offset, bp->dirty_length);
+}
+
+int
+buf_ValidateCheckSum(cm_buf_t * bp)
+{
+ MD5_CTX md5;
+ unsigned char tmp[16];
+
+ MD5_Init(&md5);
+ MD5_Update(&md5, bp->datap, cm_data.blockSize);
+ MD5_Final(tmp, &md5);
+
+ if (memcmp(tmp, bp->md5cksum, 16) == 0)
+ return 1;
+ return 0;
+}
+
+void
+buf_InsertToRedirQueue(cm_scache_t *scp, cm_buf_t *bufp)
+{
+ lock_AssertWrite(&buf_globalLock);
+
+ lock_ObtainMutex(&scp->redirMx);
+
+ if (bufp->qFlags & CM_BUF_QINLRU) {
+ _InterlockedAnd(&bufp->qFlags, ~CM_BUF_QINLRU);
+ osi_QRemoveHT( (osi_queue_t **) &cm_data.buf_freeListp,
+ (osi_queue_t **) &cm_data.buf_freeListEndp,
+ &bufp->q);
+ buf_DecrementFreeCount();
+ }
+ _InterlockedOr(&bufp->qFlags, CM_BUF_QREDIR);
+ osi_QAddH( (osi_queue_t **) &cm_data.buf_redirListp,
+ (osi_queue_t **) &cm_data.buf_redirListEndp,
+ &bufp->q);
+ buf_IncrementRedirCount();
+ bufp->redirLastAccess = time(NULL);
+ if (scp) {
+ osi_QAddH( (osi_queue_t **) &scp->redirQueueH,
+ (osi_queue_t **) &scp->redirQueueT,
+ &bufp->redirq);
+ scp->redirLastAccess = bufp->redirLastAccess;
+ InterlockedIncrement(&scp->redirBufCount);
+ }
+
+ lock_ReleaseMutex(&scp->redirMx);
+}
+
+void
+buf_RemoveFromRedirQueue(cm_scache_t *scp, cm_buf_t *bufp)
+{
+ lock_AssertWrite(&buf_globalLock);
+
+ lock_ObtainMutex(&scp->redirMx);
+
+ _InterlockedAnd(&bufp->qFlags, ~CM_BUF_QREDIR);
+ osi_QRemoveHT( (osi_queue_t **) &cm_data.buf_redirListp,
+ (osi_queue_t **) &cm_data.buf_redirListEndp,
+ &bufp->q);
+ buf_DecrementRedirCount();
+ if (scp) {
+ osi_QRemoveHT( (osi_queue_t **) &scp->redirQueueH,
+ (osi_queue_t **) &scp->redirQueueT,
+ &bufp->redirq);
+ InterlockedDecrement(&scp->redirBufCount);
+ }
+
+ lock_ReleaseMutex(&scp->redirMx);
+}
+
+void
+buf_MoveToHeadOfRedirQueue(cm_scache_t *scp, cm_buf_t *bufp)
+{
+ lock_AssertWrite(&buf_globalLock);
+ osi_assertx(bufp->qFlags & CM_BUF_QREDIR,
+ "buf_MoveToHeadOfRedirQueue buffer not held by redirector");
+
+ lock_ObtainMutex(&scp->redirMx);
+
+ osi_QRemoveHT( (osi_queue_t **) &cm_data.buf_redirListp,
+ (osi_queue_t **) &cm_data.buf_redirListEndp,
+ &bufp->q);
+ osi_QAddH( (osi_queue_t **) &cm_data.buf_redirListp,
+ (osi_queue_t **) &cm_data.buf_redirListEndp,
+ &bufp->q);
+ bufp->redirLastAccess = time(NULL);
+ if (scp) {
+ osi_QRemoveHT( (osi_queue_t **) &scp->redirQueueH,
+ (osi_queue_t **) &scp->redirQueueT,
+ &bufp->redirq);
+ osi_QAddH( (osi_queue_t **) &scp->redirQueueH,
+ (osi_queue_t **) &scp->redirQueueT,
+ &bufp->redirq);
+ scp->redirLastAccess = bufp->redirLastAccess;
+ }
+
+ lock_ReleaseMutex(&scp->redirMx);
+}
git://git.openafs.org / openafs.git / blobdiff