#include <stdio.h>
#include <strsafe.h>
#include <math.h>
+#include <hcrypto\md5.h>
#include "afsd.h"
#include "cm_memmap.h"
/* 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
lock_ConvertRToW(&buf_globalLock);
if (bp->refCount == 0 &&
- !(bp->qFlags & CM_BUF_QINLRU)) {
- 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->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)
void buf_Release(cm_buf_t *bp)
#endif
{
- 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)) {
- 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;
- _InterlockedOr(&bp->qFlags, CM_BUF_QINLRU);
- }
- lock_ReleaseWrite(&buf_globalLock);
- }
+ lock_ObtainRead(&buf_globalLock);
+ buf_ReleaseLocked(bp, FALSE);
+ lock_ReleaseRead(&buf_globalLock);
}
long
if (quitOnShutdown && buf_ShutdownFlag)
break;
+ /*
+ * 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);
+
+ /* Request single buffer from the redirector */
+ buf_RDRShakeAnExtentFree(bp, &req);
+ }
+
lock_ReleaseRead(&buf_globalLock);
- /* all dirty buffers are held when they are added to the
- * dirty list. No need for an additional hold.
- */
+ /*
+ * 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 && !(bp->qFlags & CM_BUF_QREDIR)) {
+ 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.
case vl_unknown:
cm_InitReq(&req);
req.flags |= CM_REQ_NORETRY;
- buf_CleanAsyncLocked(NULL, bp, &req, 0, &dirty);
+ buf_CleanLocked(NULL, bp, &req, 0, &dirty);
wasDirty |= dirty;
}
cm_PutVolume(volp);
lock_ObtainWrite(&buf_globalLock);
#ifdef DEBUG_REFCOUNT
if (bp->dirtyp == NULL && bp != cm_data.buf_dirtyListEndp) {
- osi_Log1(afsd_logp,"buf_IncrSyncer bp 0x%p list corruption",bp);
- afsi_log("buf_IncrSyncer bp 0x%p list corruption", bp);
+ 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;
}
/* incremental sync daemon. Writes all dirty buffers every 5000 ms */
-void buf_IncrSyncer(long parm)
+static void *
+buf_IncrSyncer(void * parm)
{
long wasDirty = 0;
long i;
while (buf_ShutdownFlag == 0) {
-
if (!wasDirty) {
i = SleepEx(5000, 1);
if (i != 0)
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) {
}
}
+ 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");
{
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 (osi_Once(&once)) {
/* initialize global locks */
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 *));
bp->allp = cm_data.buf_allp;
cm_data.buf_allp = bp;
- osi_QAdd((osi_queue_t **)&cm_data.buf_freeListp, &bp->q);
+ 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;
bp = cm_data.bufHeaderBaseAddress;
data = cm_data.bufDataBaseAddress;
+ lock_ObtainWrite(&buf_globalLock);
for (i=0; i<cm_data.buf_nbuffers; i++) {
lock_InitializeMutex(&bp->mx, "Buffer mutex", LOCK_HIERARCHY_BUFFER);
bp->userp = NULL;
bp->waitCount = 0;
bp->waitRequests = 0;
_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.
+ */
+ buf_RemoveFromRedirQueue(NULL, bp);
+ bp->dataVersion = CM_BUF_VERSION_BAD;
+ bp->redirq.nextp = bp->redirq.prevp = NULL;
+ bp->redirLastAccess = 0;
+ bp->redirReleaseRequested = 0;
+ buf_ReleaseLocked(bp, TRUE);
+ InterlockedDecrement(&cm_data.buf_usedCount);
+ }
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.
+ */
+ buf_RemoveFromRedirQueue(NULL, bp);
+ bp->dataVersion = CM_BUF_VERSION_BAD;
+ bp->redirq.nextp = bp->redirq.prevp = NULL;
+ bp->redirLastAccess = 0;
+ bp->redirReleaseRequested = 0;
+ buf_ReleaseLocked(bp, TRUE);
+ InterlockedDecrement(&cm_data.buf_usedCount);
+ }
+ lock_ReleaseWrite(&buf_globalLock);
}
#ifdef 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
}
if ( scp ) {
lock_ObtainRead(&scp->rw);
- if (scp->flags & CM_SCACHEFLAG_WAITING) {
+ if (!osi_QIsEmpty(&scp->waitQueueH)) {
osi_Log1(buf_logp, "buf_WaitIO waking scp 0x%p", scp);
osi_Wakeup((LONG_PTR)&scp->flags);
}
* '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.
*/
-afs_uint32 buf_CleanAsyncLocked(cm_scache_t *scp, 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)
{
afs_uint32 code = 0;
* 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;
+ if (scp == NULL &&
+ cm_GetSCache(&bp->fid, NULL, &scp,
+ bp->userp ? bp->userp : cm_rootUserp,
+ reqp) == 0)
+ {
+ release_scp = 1;
+
+ lock_ObtainWrite(&scp->rw);
+ code = cm_SyncOp(scp, NULL, bp->userp ? bp->userp : cm_rootUserp, reqp, 0,
+ CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
+ if (code == 0) {
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
}
+ lock_ReleaseWrite(&scp->rw);
+ }
+
+ if (scp && (scp->flags & CM_SCACHEFLAG_DELETED)) {
+ _InterlockedAnd(&bp->flags, ~CM_BUF_DIRTY);
+ _InterlockedOr(&bp->flags, CM_BUF_ERROR);
+ bp->dirty_length = 0;
+ bp->error = code;
+ bp->dataVersion = CM_BUF_VERSION_BAD;
+ bp->dirtyCounter++;
+ InterlockedDecrement(&cm_data.buf_usedCount);
}
while ((bp->flags & CM_BUF_DIRTY) == CM_BUF_DIRTY) {
* in fact be the case but we don't know that until we attempt
* a FetchStatus on the FID.
*/
- osi_Log1(buf_logp, "buf_CleanAsyncLocked unable to start I/O - scp not found buf 0x%p", bp);
+ 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_CleanAsyncLocked starts I/O on scp 0x%p buf 0x%p", scp, bp);
+ 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));
- code = (*cm_buf_opsp->Writep)(scp, &offset,
-#if 1
- /* we might as well try to write all of the contiguous
- * dirty buffers in one RPC
- */
- cm_chunkSize,
-#else
- bp->dirty_length,
-#endif
- flags, bp->userp, reqp);
- osi_Log3(buf_logp, "buf_CleanAsyncLocked I/O on scp 0x%p buf 0x%p, done=%d", scp, bp, code);
+ /*
+ * 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 ? bp->userp : cm_rootUserp, 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
*/
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){
+ code == CM_ERROR_READONLY || code == CM_ERROR_NOSUCHPATH || code == EIO ||
+ code == CM_ERROR_INVAL || code == CM_ERROR_INVAL_NET_RESP || code == CM_ERROR_UNKNOWN){
_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++;
+ InterlockedDecrement(&cm_data.buf_usedCount);
break;
}
if (reqp->flags & CM_REQ_NORETRY)
break;
- /* Ditto if the hardDeadTimeout or idleTimeout was reached */
+ /*
+ * Ditto if the hardDeadTimeout or idleTimeout was reached
+ * Or a fatal error is received.
+ */
if (code == CM_ERROR_TIMEDOUT || code == CM_ERROR_ALLDOWN ||
code == CM_ERROR_ALLBUSY || code == CM_ERROR_ALLOFFLINE ||
- code == CM_ERROR_CLOCKSKEW) {
+ code == CM_ERROR_CLOCKSKEW || code == CM_ERROR_INVAL_NET_RESP ||
+ code == CM_ERROR_INVAL || code == CM_ERROR_UNKNOWN || code == EIO) {
break;
}
}
}
/* Called with a zero-ref count buffer and with the buf_globalLock write locked.
- * recycles the buffer, and leaves it ready for reuse with a ref count of 1.
+ * recycles the buffer, and leaves it ready for reuse with a ref count of 0.
* The buffer must already be clean, and no I/O should be happening to it.
*/
void buf_Recycle(cm_buf_t *bp)
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
* the dude to return.
i = BUF_HASH(&bp->fid, &bp->offset);
lbpp = &(cm_data.buf_scacheHashTablepp[i]);
- for(tbp = *lbpp; tbp; lbpp = &tbp->hashp, tbp = *lbpp) {
+ for(tbp = *lbpp; tbp; lbpp = &tbp->hashp, tbp = tbp->hashp) {
if (tbp == bp)
break;
}
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
cm_buf_t *bp; /* buffer we're dealing with */
cm_buf_t *nextBp; /* next buffer in file hash chain */
afs_uint32 i; /* temp */
+ afs_uint64 n_bufs, n_nonzero, n_busy, n_dirty, n_own, n_redir;
#ifdef TESTING
buf_ValidateBufQueues();
while(1) {
retry:
+ n_bufs = 0;
+ n_nonzero = 0;
+ n_own = 0;
+ n_busy = 0;
+ n_dirty = 0;
+ n_redir = 0;
+
lock_ObtainRead(&scp->bufCreateLock);
lock_ObtainWrite(&buf_globalLock);
/* check to see if we lost the race */
- if (scp) {
- 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_GetNewLocked bp 0x%p ref %d", bp, refCount);
- afsi_log("%s:%d buf_GetNewLocked bp 0x%p, ref %d", __FILE__, __LINE__, bp, refCount);
-#endif
- lock_ReleaseWrite(&buf_globalLock);
- lock_ReleaseRead(&scp->bufCreateLock);
- 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. */
{
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)) {
+ int cleaned = 0;
+
+ n_bufs++;
+
+ retry_2:
/* 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 a buffer held by the redirector. */
- if (bp->qFlags & CM_BUF_QREDIR)
- continue;
-
/* 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;
+ }
+
+ /* leave the buffer alone if held by the redirector */
+ if (bp->qFlags & CM_BUF_QREDIR) {
+ n_redir++;
continue;
}
if (bp->flags & CM_BUF_DIRTY) {
+ n_dirty++;
+
+ /* protect against cleaning the same buffer more than once. */
+ if (cleaned)
+ 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
lock_ReleaseWrite(&buf_globalLock);
lock_ReleaseRead(&scp->bufCreateLock);
- /* 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.
+ /*
+ * 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.
*/
if (cm_FidCmp(&scp->fid, &bp->fid) == 0)
- buf_CleanAsync(scp, bp, reqp, 0, NULL);
+ buf_Clean(scp, bp, reqp, 0, NULL);
else
- buf_CleanAsync(NULL, bp, reqp, 0, NULL);
+ 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;
+ }
+
+ /*
+ * We just cleaned this buffer so we need to
+ * restart the loop with this buffer so it
+ * can be retested. Set 'cleaned' so we
+ * do not attempt another call to buf_Clean()
+ * if the prior attempt failed.
+ */
+ cleaned = 1;
+ goto retry_2;
}
+ 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.
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->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);
+ 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;
+ InterlockedIncrement(&bp->refCount);
#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);
osi_panic("buf_GetNewLocked: TryMutex failed",__FILE__,__LINE__);
}
+ if ( cm_data.buf_usedCount < cm_data.buf_nbuffers)
+ InterlockedIncrement(&cm_data.buf_usedCount);
+
lock_ReleaseWrite(&buf_globalLock);
lock_ReleaseRead(&scp->bufCreateLock);
} /* for all buffers in lru queue */
lock_ReleaseWrite(&buf_globalLock);
lock_ReleaseRead(&scp->bufCreateLock);
- osi_Log0(afsd_logp, "buf_GetNewLocked: Free Buffer List has no buffers with a zero refcount - sleeping 100ms");
+
+ osi_Log2(afsd_logp, "buf_GetNewLocked: Free Buffer List has %u buffers none free; redir %u", n_bufs, n_redir);
+ 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;
+ }
+ }
+
Sleep(100); /* give some time for a buffer to be freed */
} /* while loop over everything */
/* not reached */
if (code != 0) {
/* failure or queued */
+
+ /* unless cm_BufRead() is altered, this path cannot be hit */
if (code != ERROR_IO_PENDING) {
bp->error = code;
_InterlockedOr(&bp->flags, CM_BUF_ERROR);
*/
lock_ObtainWrite(&buf_globalLock);
if (bp->qFlags & CM_BUF_QINLRU) {
- 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);
+ 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->qFlags & CM_BUF_QINHASH) || bufp->dataVersion == CM_BUF_VERSION_BAD)
- count++;
- }
- lock_ReleaseRead(&buf_globalLock);
- return count;
-}
-
/* clean a buffer synchronously */
-afs_uint32 buf_CleanAsync(cm_scache_t *scp, cm_buf_t *bp, cm_req_t *reqp, afs_uint32 flags, afs_uint32 *pisdirty)
+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_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(scp, bp, reqp, flags, pisdirty);
+ code = buf_CleanLocked(scp, bp, reqp, flags, pisdirty);
lock_ReleaseMutex(&bp->mx);
return code;
*
* The buffer must be locked before calling this routine.
*/
-void buf_SetDirty(cm_buf_t *bp, afs_uint32 offset, afs_uint32 length, cm_user_t *userp)
+void buf_SetDirty(cm_buf_t *bp, cm_req_t *reqp, afs_uint32 offset, afs_uint32 length, cm_user_t *userp)
{
osi_assertx(bp->magic == CM_BUF_MAGIC, "invalid cm_buf_t magic");
osi_assertx(bp->refCount > 0, "cm_buf_t refcount 0");
+ osi_assertx(userp != NULL, "userp is NULL");
+
+ if (length == 0)
+ return;
if (bp->flags & CM_BUF_DIRTY) {
bp->dirty_offset = offset;
bp->dirty_length = length;
- /* and add to the dirty list.
+ /*
+ * 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
* elsewhere, never add to the dirty list if the buffer is
* already there.
*/
- 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;
+ 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);
}
- bp->dirtyp = NULL;
- _InterlockedOr(&bp->qFlags, CM_BUF_QINDL);
+ lock_ReleaseWrite(&buf_globalLock);
}
- lock_ReleaseWrite(&buf_globalLock);
}
/* and record the last writer */
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_ReleaseRead(&buf_globalLock);
cm_InitReq(&req);
req.flags |= CM_REQ_NORETRY;
- buf_CleanAsync(NULL, bp, &req, 0, NULL);
+ buf_Clean(NULL, bp, &req, 0, NULL);
buf_CleanWait(NULL, bp, FALSE);
/* relock and release buffer */
long code;
long bufferPos;
afs_uint32 i;
+ afs_uint32 invalidate = 0;
/* assert that cm_bufCreateLock is held in write mode */
lock_AssertWrite(&scp->bufCreateLock);
buf_HoldLocked(bufp);
lock_ReleaseRead(&buf_globalLock);
+
while (bufp) {
lock_ObtainMutex(&bufp->mx);
*/
if (LargeIntegerLessThanOrEqualTo(*sizep, bufp->offset)) {
/* truncating the entire page */
+ 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->dirty_offset = 0;
+ bufp->error = 0;
bufp->dirty_length = 0;
bufp->dataVersion = CM_BUF_VERSION_BAD; /* known bad */
bufp->dirtyCounter++;
+ InterlockedDecrement(&cm_data.buf_usedCount);
}
else {
/* don't set dirty, since dirty implies
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;
}
_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);
+ InterlockedDecrement(&cm_data.buf_usedCount);
} 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_CleanAsyncLocked(scp, bp, reqp, 0, NULL);
+ buf_CleanLocked(scp, bp, reqp, 0, NULL);
buf_WaitIO(scp, bp);
lock_ReleaseMutex(&bp->mx);
/* 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->flags & CM_BUF_DIRTY) && !(bp->qFlags & CM_BUF_QREDIR)) {
lock_ObtainWrite(&buf_globalLock);
- 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);
+ 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;
+ if (bp->dataVersion != CM_BUF_VERSION_BAD)
+ InterlockedDecrement(&cm_data.buf_usedCount);
+ buf_Recycle(bp);
+ }
}
lock_ReleaseWrite(&buf_globalLock);
}
}
/* Must be called with scp->rw held */
+long buf_InvalidateBuffers(cm_scache_t * scp)
+{
+ 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) {
+ bp->dataVersion = CM_BUF_VERSION_BAD;
+ InterlockedDecrement(&cm_data.buf_usedCount);
+ found = 1;
+ }
+ }
+ lock_ReleaseRead(&buf_globalLock);
+
+ if (found)
+ return 0;
+ else
+ return ENOENT;
+}
+
+/* Must be called with scp->rw held */
long buf_ForceDataVersion(cm_scache_t * scp, afs_uint64 fromVersion, afs_uint64 toVersion)
{
cm_buf_t * bp;
cm_buf_t *nbp; /* next one */
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_ObtainRead(&buf_globalLock);
for (; bp; bp = nbp) {
/* clean buffer synchronously */
if (cm_FidCmp(&bp->fid, &scp->fid) == 0) {
+ /*
+ * 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_DIRTY) {
+ if ((bp->flags & CM_BUF_DIRTY)) {
if (userp && userp != bp->userp) {
cm_HoldUser(userp);
if (bp->userp)
switch (code) {
case CM_ERROR_NOSUCHFILE:
+ case CM_ERROR_INVAL:
case CM_ERROR_BADFD:
case CM_ERROR_NOACCESS:
case CM_ERROR_QUOTA:
case CM_ERROR_TOOBIG:
case CM_ERROR_READONLY:
case CM_ERROR_NOSUCHPATH:
+ case EIO:
+ case CM_ERROR_INVAL_NET_RESP:
+ case CM_ERROR_UNKNOWN:
/*
* Apply the previous fatal error to this buffer.
* Do not waste the time attempting to store to
*/
_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++;
+ InterlockedDecrement(&cm_data.buf_usedCount);
break;
case CM_ERROR_TIMEDOUT:
case CM_ERROR_ALLDOWN:
*/
break;
default:
- code = buf_CleanAsyncLocked(scp, bp, reqp, 0, &wasDirty);
+ code = buf_CleanLocked(scp, bp, reqp, 0, &wasDirty);
if (bp->flags & CM_BUF_ERROR) {
code = bp->error;
if (code == 0)
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 found;
+}
+
+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->flags & CM_BUF_DIRTY))
- return 1;
+ 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);
+ }
+
}
+ lock_ReleaseWrite(&buf_globalLock);
+ lock_ReleaseWrite(&scp->rw);
return 0;
}
lock_ObtainMutex(&bp->mx);
_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;
}
lock_ReleaseMutex(&bp->mx);
buf_Release(bp);
+ InterlockedDecrement(&cm_data.buf_usedCount);
}
}
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);
+
+ if (scp) {
+ 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);
+
+ if (!(bufp->qFlags & CM_BUF_QREDIR))
+ return;
+
+ if (scp) {
+ 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);
+ if (!(bufp->qFlags & CM_BUF_QREDIR))
+ return;
+
+ if (scp) {
+ 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