/*
* Copyright 2000, International Business Machines Corporation and others.
* All Rights Reserved.
- *
+ *
* This software has been released under the terms of the IBM Public
* License. For details, see the LICENSE file in the top-level source
* directory or online at http://www.openafs.org/dl/license10.html
*/
+
+#include <afsconfig.h>
#include <afs/param.h>
+#include <roken.h>
+
#include <afs/stds.h>
-#ifndef DJGPP
#include <windows.h>
#include <winsock2.h>
#include <nb30.h>
-#endif /* !DJGPP */
-#ifdef COMMENT
-#include <malloc.h>
-#endif
#include <string.h>
#include <stdlib.h>
#include <osi.h>
extern void afsi_log(char *pattern, ...);
#endif
-osi_mutex_t cm_bufGetMutex;
#ifdef AFS_FREELANCE_CLIENT
extern osi_mutex_t cm_Freelance_Lock;
#endif
+#define USE_RX_IOVEC 1
+
+/* we can access connp->serverp without holding a lock because that
+ never changes since the connection is made. */
+#define SERVERHAS64BIT(connp) (!((connp)->serverp->flags & CM_SERVERFLAG_NO64BIT))
+#define SET_SERVERHASNO64BIT(connp) (cm_SetServerNo64Bit((connp)->serverp, TRUE))
+
/* functions called back from the buffer package when reading or writing data,
* or when holding or releasing a vnode pointer.
*/
-long cm_BufWrite(void *vfidp, osi_hyper_t *offsetp, long length, long flags,
+long cm_BufWrite(void *vscp, osi_hyper_t *offsetp, long length, long flags,
cm_user_t *userp, cm_req_t *reqp)
{
/* store the data back from this buffer; the buffer is locked and held,
* released by our caller. Thus, we don't have to worry about holding
* bufp->scp.
*/
- long code;
- cm_fid_t *fidp = vfidp;
- cm_scache_t *scp;
- long nbytes;
+ long code, code1;
+ cm_scache_t *scp = vscp;
+ afs_int32 nbytes;
+ afs_int32 save_nbytes;
long temp;
AFSFetchStatus outStatus;
AFSStoreStatus inStatus;
osi_hyper_t thyper;
AFSVolSync volSync;
AFSFid tfid;
- struct rx_call *oldCallp, *callp;
+ struct rx_call *rxcallp;
+ struct rx_connection *rxconnp;
osi_queueData_t *qdp;
cm_buf_t *bufp;
- long wbytes;
+ afs_uint32 wbytes;
char *bufferp;
cm_conn_t *connp;
- long truncPos;
+ osi_hyper_t truncPos;
cm_bulkIO_t biod; /* bulk IO descriptor */
+ int require_64bit_ops = 0;
+ int call_was_64bit = 0;
+ int scp_locked = flags & CM_BUF_WRITE_SCP_LOCKED;
+
+ osi_assertx(userp != NULL, "null cm_user_t");
+ osi_assertx(scp != NULL, "null cm_scache_t");
- osi_assert(userp != NULL);
+ memset(&volSync, 0, sizeof(volSync));
- /* now, the buffer may or may not be filled with good data (buf_GetNew
+ /* now, the buffer may or may not be filled with good data (buf_GetNewLocked
* drops lots of locks, and may indeed return a properly initialized
* buffer, although more likely it will just return a new, empty, buffer.
*/
- scp = cm_FindSCache(fidp);
- if (scp == NULL)
- return CM_ERROR_NOSUCHFILE; /* shouldn't happen */
+ if (!scp_locked)
+ lock_ObtainWrite(&scp->rw);
+ if (scp->flags & CM_SCACHEFLAG_DELETED) {
+ if (!scp_locked)
+ lock_ReleaseWrite(&scp->rw);
+ return CM_ERROR_NOSUCHFILE;
+ }
- cm_AFSFidFromFid(&tfid, fidp);
+ cm_AFSFidFromFid(&tfid, &scp->fid);
+
+ /* Serialize StoreData RPC's; for rationale see cm_scache.c */
+ (void) cm_SyncOp(scp, NULL, userp, reqp, 0, CM_SCACHESYNC_STOREDATA_EXCL);
- lock_ObtainMutex(&scp->mx);
-
code = cm_SetupStoreBIOD(scp, offsetp, length, &biod, userp, reqp);
if (code) {
osi_Log1(afsd_logp, "cm_SetupStoreBIOD code %x", code);
- lock_ReleaseMutex(&scp->mx);
- cm_ReleaseSCache(scp);
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
+ if (!scp_locked)
+ lock_ReleaseWrite(&scp->rw);
return code;
}
if (biod.length == 0) {
osi_Log0(afsd_logp, "cm_SetupStoreBIOD length 0");
- lock_ReleaseMutex(&scp->mx);
- cm_ReleaseBIOD(&biod, 1); /* should be a NOOP */
- cm_ReleaseSCache(scp);
+ cm_ReleaseBIOD(&biod, 1, 0, 1); /* should be a NOOP */
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
+ if (!scp_locked)
+ lock_ReleaseWrite(&scp->rw);
return 0;
- }
-
- /* Serialize StoreData RPC's; for rationale see cm_scache.c */
- (void) cm_SyncOp(scp, NULL, userp, reqp, 0, CM_SCACHESYNC_STOREDATA_EXCL);
+ }
/* prepare the output status for the store */
scp->mask |= CM_SCACHEMASK_CLIENTMODTIME;
cm_StatusFromAttr(&inStatus, scp, NULL);
- truncPos = scp->length.LowPart;
+ truncPos = scp->length;
if ((scp->mask & CM_SCACHEMASK_TRUNCPOS)
- && scp->truncPos.LowPart < (unsigned long) truncPos)
- truncPos = scp->truncPos.LowPart;
+ && LargeIntegerLessThan(scp->truncPos, truncPos))
+ truncPos = scp->truncPos;
scp->mask &= ~CM_SCACHEMASK_TRUNCPOS;
-
+
/* compute how many bytes to write from this buffer */
thyper = LargeIntegerSubtract(scp->length, biod.offset);
if (LargeIntegerLessThanZero(thyper)) {
/* otherwise write out part of buffer before EOF, but not
* more than bufferSize bytes.
*/
- nbytes = thyper.LowPart;
- if (nbytes > biod.length)
+ if (LargeIntegerGreaterThan(thyper,
+ ConvertLongToLargeInteger(biod.length))) {
nbytes = biod.length;
+ } else {
+ /* if thyper is less than or equal to biod.length, then we
+ can safely assume that the value fits in a long. */
+ nbytes = thyper.LowPart;
+ }
}
- lock_ReleaseMutex(&scp->mx);
-
+ if (LargeIntegerGreaterThan(LargeIntegerAdd(biod.offset,
+ ConvertLongToLargeInteger(nbytes)),
+ ConvertLongToLargeInteger(LONG_MAX)) ||
+ LargeIntegerGreaterThan(truncPos,
+ ConvertLongToLargeInteger(LONG_MAX))) {
+ require_64bit_ops = 1;
+ }
+
+ lock_ReleaseWrite(&scp->rw);
+
/* now we're ready to do the store operation */
+ save_nbytes = nbytes;
do {
- code = cm_Conn(&scp->fid, userp, reqp, &connp);
- if (code)
+ code = cm_ConnFromFID(&scp->fid, userp, reqp, &connp);
+ if (code)
continue;
-
- oldCallp = cm_GetRxConn(connp);
- callp = rx_NewCall(oldCallp);
- rx_PutConnection(oldCallp);
- osi_Log3(afsd_logp, "CALL StoreData scp 0x%x, off 0x%x, size 0x%x",
- (long) scp, biod.offset.LowPart, nbytes);
-
- code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
- biod.offset.LowPart, nbytes, truncPos);
+ retry:
+ rxconnp = cm_GetRxConn(connp);
+ rxcallp = rx_NewCall(rxconnp);
+ rx_PutConnection(rxconnp);
+
+ if (SERVERHAS64BIT(connp)) {
+ call_was_64bit = 1;
+
+ osi_Log4(afsd_logp, "CALL StartRXAFS_StoreData64 scp 0x%p, offset 0x%x:%08x, length 0x%x",
+ scp, biod.offset.HighPart, biod.offset.LowPart, nbytes);
+
+ code = StartRXAFS_StoreData64(rxcallp, &tfid, &inStatus,
+ biod.offset.QuadPart,
+ nbytes,
+ truncPos.QuadPart);
+ if (code)
+ osi_Log1(afsd_logp, "CALL StartRXAFS_StoreData64 FAILURE, code 0x%x", code);
+ else
+ osi_Log0(afsd_logp, "CALL StartRXAFS_StoreData64 SUCCESS");
+ } else {
+ call_was_64bit = 0;
+
+ if (require_64bit_ops) {
+ osi_Log0(afsd_logp, "Skipping StartRXAFS_StoreData. The operation requires large file support in the server.");
+ code = CM_ERROR_TOOBIG;
+ } else {
+ osi_Log4(afsd_logp, "CALL StartRXAFS_StoreData scp 0x%p, offset 0x%x:%08x, length 0x%x",
+ scp, biod.offset.HighPart, biod.offset.LowPart, nbytes);
+
+ code = StartRXAFS_StoreData(rxcallp, &tfid, &inStatus,
+ biod.offset.LowPart, nbytes, truncPos.LowPart);
+ if (code)
+ osi_Log1(afsd_logp, "CALL StartRXAFS_StoreData FAILURE, code 0x%x", code);
+ else
+ osi_Log0(afsd_logp, "CALL StartRXAFS_StoreData SUCCESS");
+ }
+ }
if (code == 0) {
+ afs_uint32 buf_offset = 0, bytes_copied = 0;
+
/* write the data from the the list of buffers */
qdp = NULL;
while(nbytes > 0) {
- if (qdp == NULL)
+#ifdef USE_RX_IOVEC
+ struct iovec tiov[RX_MAXIOVECS];
+ afs_int32 tnio, vlen, vbytes, iov, voffset;
+ afs_uint32 vleft;
+
+ vbytes = rx_WritevAlloc(rxcallp, tiov, &tnio, RX_MAXIOVECS, nbytes);
+ if (vbytes <= 0) {
+ code = RX_PROTOCOL_ERROR;
+ break;
+ }
+
+ for ( iov = voffset = vlen = 0;
+ vlen < vbytes && iov < tnio; vlen += wbytes) {
+ if (qdp == NULL) {
+ qdp = biod.bufListEndp;
+ buf_offset = offsetp->LowPart % cm_data.buf_blockSize;
+ } else if (buf_offset == cm_data.buf_blockSize) {
+ qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
+ buf_offset = 0;
+ }
+
+ osi_assertx(qdp != NULL, "null osi_queueData_t");
+ bufp = osi_GetQData(qdp);
+ bufferp = bufp->datap + buf_offset;
+ wbytes = vbytes - vlen;
+ if (wbytes > cm_data.buf_blockSize - buf_offset)
+ wbytes = cm_data.buf_blockSize - buf_offset;
+
+ vleft = tiov[iov].iov_len - voffset;
+ while (wbytes > vleft && iov < tnio) {
+ memcpy(tiov[iov].iov_base + voffset, bufferp, vleft);
+ bytes_copied += vleft;
+ vlen += vleft;
+ wbytes -= vleft;
+ bufferp += vleft;
+ buf_offset += vleft;
+
+ iov++;
+ voffset = 0;
+ vleft = tiov[iov].iov_len;
+ }
+
+ if (iov < tnio) {
+ memcpy(tiov[iov].iov_base + voffset, bufferp, wbytes);
+ bytes_copied += wbytes;
+ if (tiov[iov].iov_len == voffset + wbytes) {
+ iov++;
+ voffset = 0;
+ vleft = (iov < tnio) ? tiov[iov].iov_len : 0;
+ } else {
+ voffset += wbytes;
+ vleft -= wbytes;
+ }
+ bufferp += wbytes;
+ buf_offset += wbytes;
+ } else {
+ voffset = vleft = 0;
+ }
+ }
+
+ osi_assertx(iov == tnio, "incorrect iov count");
+ osi_assertx(vlen == vbytes, "bytes_copied != vbytes");
+ osi_assertx(bufp->offset.QuadPart + buf_offset == biod.offset.QuadPart + bytes_copied,
+ "begin and end offsets don't match");
+
+ temp = rx_Writev(rxcallp, tiov, tnio, vbytes);
+ if (temp != vbytes) {
+ osi_Log3(afsd_logp, "rx_Writev failed bp 0x%p, %d != %d", bufp, temp, vbytes);
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
+ break;
+ }
+
+ osi_Log3(afsd_logp, "rx_Writev succeeded bp 0x%p offset 0x%x, wrote %u",
+ bufp, buf_offset, vbytes);
+ nbytes -= vbytes;
+#else /* USE_RX_IOVEC */
+ if (qdp == NULL) {
qdp = biod.bufListEndp;
- else
+ buf_offset = offsetp->LowPart % cm_data.buf_blockSize;
+ } else {
qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
- osi_assert(qdp != NULL);
+ buf_offset = 0;
+ }
+
+ osi_assertx(qdp != NULL, "null osi_queueData_t");
bufp = osi_GetQData(qdp);
- bufferp = bufp->datap;
+ bufferp = bufp->datap + buf_offset;
wbytes = nbytes;
- if (wbytes > cm_data.buf_blockSize)
- wbytes = cm_data.buf_blockSize;
+ if (wbytes > cm_data.buf_blockSize - buf_offset)
+ wbytes = cm_data.buf_blockSize - buf_offset;
/* write out wbytes of data from bufferp */
- temp = rx_Write(callp, bufferp, wbytes);
+ temp = rx_Write(rxcallp, bufferp, wbytes);
if (temp != wbytes) {
- osi_Log2(afsd_logp, "rx_Write failed %d != %d",temp,wbytes);
- code = -1;
+ osi_Log3(afsd_logp, "rx_Write failed bp 0x%p, %d != %d",bufp,temp,wbytes);
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
break;
} else {
- osi_Log1(afsd_logp, "rx_Write succeeded %d",temp);
- }
+ osi_Log2(afsd_logp, "rx_Write succeeded bp 0x%p, %d",bufp,temp);
+ }
nbytes -= wbytes;
+#endif /* USE_RX_IOVEC */
} /* while more bytes to write */
- } /* if RPC started successfully */
- else {
- osi_Log1(afsd_logp, "StartRXAFS_StoreData failed (%lX)",code);
- }
+ } /* if RPC started successfully */
+
if (code == 0) {
- code = EndRXAFS_StoreData(callp, &outStatus, &volSync);
- if (code)
- osi_Log1(afsd_logp, "EndRXAFS_StoreData failed (%lX)",code);
+ if (call_was_64bit) {
+ code = EndRXAFS_StoreData64(rxcallp, &outStatus, &volSync);
+ if (code)
+ osi_Log2(afsd_logp, "EndRXAFS_StoreData64 FAILURE scp 0x%p code %lX", scp, code);
+ else
+ osi_Log0(afsd_logp, "EndRXAFS_StoreData64 SUCCESS");
+ } else {
+ code = EndRXAFS_StoreData(rxcallp, &outStatus, &volSync);
+ if (code)
+ osi_Log2(afsd_logp, "EndRXAFS_StoreData FAILURE scp 0x%p code %lX",scp,code);
+ else
+ osi_Log0(afsd_logp, "EndRXAFS_StoreData SUCCESS");
+ }
+ }
+
+ code1 = rx_EndCall(rxcallp, code);
+
+ if ((code == RXGEN_OPCODE || code1 == RXGEN_OPCODE) && SERVERHAS64BIT(connp)) {
+ SET_SERVERHASNO64BIT(connp);
+ qdp = NULL;
+ nbytes = save_nbytes;
+ goto retry;
}
- code = rx_EndCall(callp, code);
-
+
+ /* Prefer StoreData error over rx_EndCall error */
+ if (code1 != 0)
+ code = code1;
} while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
+
code = cm_MapRPCError(code, reqp);
-
+
if (code)
- osi_Log1(afsd_logp, "CALL StoreData FAILURE, code 0x%x", code);
+ osi_Log2(afsd_logp, "CALL StoreData FAILURE scp 0x%p, code 0x%x", scp, code);
else
- osi_Log0(afsd_logp, "CALL StoreData SUCCESS");
+ osi_Log1(afsd_logp, "CALL StoreData SUCCESS scp 0x%p", scp);
/* now, clean up our state */
- lock_ObtainMutex(&scp->mx);
+ lock_ObtainWrite(&scp->rw);
- cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
+ cm_ReleaseBIOD(&biod, 1, code, 1);
if (code == 0) {
+ osi_hyper_t t;
/* now, here's something a little tricky: in AFS 3, a dirty
* length can't be directly stored, instead, a dirty chunk is
* stored that sets the file's size (by writing and by using
* We have to turn off the length dirty bit as soon as we can,
* so that we see updates made by other machines.
*/
- if (outStatus.Length >= scp->length.LowPart)
+
+ if (call_was_64bit) {
+ t.LowPart = outStatus.Length;
+ t.HighPart = outStatus.Length_hi;
+ } else {
+ t = ConvertLongToLargeInteger(outStatus.Length);
+ }
+
+ if (LargeIntegerGreaterThanOrEqualTo(t, scp->length))
scp->mask &= ~CM_SCACHEMASK_LENGTH;
- cm_MergeStatus(scp, &outStatus, &volSync, userp, 0);
+
+ cm_MergeStatus(NULL, scp, &outStatus, &volSync, userp, reqp, CM_MERGEFLAG_STOREDATA);
} else {
if (code == CM_ERROR_SPACE)
scp->flags |= CM_SCACHEFLAG_OUTOFSPACE;
else if (code == CM_ERROR_QUOTA)
scp->flags |= CM_SCACHEFLAG_OVERQUOTA;
}
- lock_ReleaseMutex(&scp->mx);
- cm_ReleaseBIOD(&biod, 1);
- cm_ReleaseSCache(scp);
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
+
+ if (!scp_locked)
+ lock_ReleaseWrite(&scp->rw);
return code;
}
AFSStoreStatus inStatus;
AFSVolSync volSync;
AFSFid tfid;
- long code;
- long truncPos;
+ long code, code1;
+ osi_hyper_t truncPos;
cm_conn_t *connp;
- struct rx_call *oldCallp, *callp;
+ struct rx_call *rxcallp;
+ struct rx_connection *rxconnp;
+ int require_64bit_ops = 0;
+ int call_was_64bit = 0;
+
+ memset(&volSync, 0, sizeof(volSync));
/* Serialize StoreData RPC's; for rationale see cm_scache.c */
(void) cm_SyncOp(scp, NULL, userp, reqp, 0,
scp->mask &= ~CM_SCACHEMASK_CLIENTMODTIME;
/* calculate truncation position */
- truncPos = scp->length.LowPart;
+ truncPos = scp->length;
if ((scp->mask & CM_SCACHEMASK_TRUNCPOS)
- && scp->truncPos.LowPart < (unsigned long) truncPos)
- truncPos = scp->truncPos.LowPart;
+ && LargeIntegerLessThan(scp->truncPos, truncPos))
+ truncPos = scp->truncPos;
scp->mask &= ~CM_SCACHEMASK_TRUNCPOS;
- lock_ReleaseMutex(&scp->mx);
+ if (LargeIntegerGreaterThan(truncPos,
+ ConvertLongToLargeInteger(LONG_MAX))) {
+
+ require_64bit_ops = 1;
+ }
+
+ lock_ReleaseWrite(&scp->rw);
cm_AFSFidFromFid(&tfid, &scp->fid);
/* now we're ready to do the store operation */
do {
- code = cm_Conn(&scp->fid, userp, reqp, &connp);
- if (code)
+ code = cm_ConnFromFID(&scp->fid, userp, reqp, &connp);
+ if (code)
continue;
-
- oldCallp = cm_GetRxConn(connp);
- callp = rx_NewCall(oldCallp);
- rx_PutConnection(oldCallp);
- code = StartRXAFS_StoreData(callp, &tfid, &inStatus,
- 0, 0, truncPos);
+ retry:
+ rxconnp = cm_GetRxConn(connp);
+ rxcallp = rx_NewCall(rxconnp);
+ rx_PutConnection(rxconnp);
- if (code == 0)
- code = EndRXAFS_StoreData(callp, &outStatus, &volSync);
- code = rx_EndCall(callp, code);
+ if (SERVERHAS64BIT(connp)) {
+ call_was_64bit = 1;
+ code = StartRXAFS_StoreData64(rxcallp, &tfid, &inStatus,
+ 0, 0, truncPos.QuadPart);
+ } else {
+ call_was_64bit = 0;
+
+ if (require_64bit_ops) {
+ code = CM_ERROR_TOOBIG;
+ } else {
+ code = StartRXAFS_StoreData(rxcallp, &tfid, &inStatus,
+ 0, 0, truncPos.LowPart);
+ }
+ }
+
+ if (code == 0) {
+ if (call_was_64bit)
+ code = EndRXAFS_StoreData64(rxcallp, &outStatus, &volSync);
+ else
+ code = EndRXAFS_StoreData(rxcallp, &outStatus, &volSync);
+ }
+ code1 = rx_EndCall(rxcallp, code);
+
+ if ((code == RXGEN_OPCODE || code1 == RXGEN_OPCODE) && SERVERHAS64BIT(connp)) {
+ SET_SERVERHASNO64BIT(connp);
+ goto retry;
+ }
+
+ /* prefer StoreData error over rx_EndCall error */
+ if (code == 0 && code1 != 0)
+ code = code1;
} while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
code = cm_MapRPCError(code, reqp);
-
- /* now, clean up our state */
- lock_ObtainMutex(&scp->mx);
- cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
+ /* now, clean up our state */
+ lock_ObtainWrite(&scp->rw);
if (code == 0) {
+ osi_hyper_t t;
/*
* For explanation of handling of CM_SCACHEMASK_LENGTH,
* see cm_BufWrite().
*/
- if (outStatus.Length >= scp->length.LowPart)
+ if (call_was_64bit) {
+ t.HighPart = outStatus.Length_hi;
+ t.LowPart = outStatus.Length;
+ } else {
+ t = ConvertLongToLargeInteger(outStatus.Length);
+ }
+
+ if (LargeIntegerGreaterThanOrEqualTo(t, scp->length))
scp->mask &= ~CM_SCACHEMASK_LENGTH;
- cm_MergeStatus(scp, &outStatus, &volSync, userp, 0);
+ cm_MergeStatus(NULL, scp, &outStatus, &volSync, userp, reqp, CM_MERGEFLAG_STOREDATA);
}
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_STOREDATA_EXCL);
return code;
}
long cm_BufRead(cm_buf_t *bufp, long nbytes, long *bytesReadp, cm_user_t *userp)
{
- *bytesReadp = cm_data.buf_blockSize;
+ *bytesReadp = 0;
/* now return a code that means that I/O is done */
return 0;
}
-/* stabilize scache entry, and return with it locked so
- * it stays stable.
+/*
+ * stabilize scache entry with CM_SCACHESYNC_SETSIZE. This prevents any new
+ * data buffers to be allocated, new data to be fetched from the file server,
+ * and writes to be accepted from the application but permits dirty buffers
+ * to be written to the file server.
+ *
+ * Stabilize uses cm_SyncOp to maintain the cm_scache_t in this stable state
+ * instead of holding the rwlock exclusively. This permits background stores
+ * to be performed in parallel and in particular allow FlushFile to be
+ * implemented without violating the locking hierarchy.
*/
-long cm_BufStabilize(void *parmp, cm_user_t *userp, cm_req_t *reqp)
+long cm_BufStabilize(void *vscp, cm_user_t *userp, cm_req_t *reqp)
{
- cm_scache_t *scp;
+ cm_scache_t *scp = vscp;
long code;
- scp = parmp;
-
- lock_ObtainMutex(&scp->mx);
- code = cm_SyncOp(scp, NULL, userp, reqp, 0,
+ lock_ObtainWrite(&scp->rw);
+ code = cm_SyncOp(scp, NULL, userp, reqp, 0,
CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_SETSIZE);
- if (code) {
- lock_ReleaseMutex(&scp->mx);
- return code;
- }
-
- return 0;
+ lock_ReleaseWrite(&scp->rw);
+
+ return code;
}
/* undoes the work that cm_BufStabilize does: releases lock so things can change again */
-long cm_BufUnstabilize(void *parmp, cm_user_t *userp)
+long cm_BufUnstabilize(void *vscp, cm_user_t *userp)
{
- cm_scache_t *scp;
-
- scp = parmp;
-
- lock_ReleaseMutex(&scp->mx);
-
+ cm_scache_t *scp = vscp;
+
+ lock_ObtainWrite(&scp->rw);
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_SETSIZE);
+
+ lock_ReleaseWrite(&scp->rw);
+
/* always succeeds */
return 0;
}
return 0;
}
-int cm_InitDCache(int newFile, long chunkSize, long nbuffers)
+int cm_InitDCache(int newFile, long chunkSize, afs_uint64 nbuffers)
{
- lock_InitializeMutex(&cm_bufGetMutex, "buf_Get mutex");
return buf_Init(newFile, &cm_bufOps, nbuffers);
}
int code;
if (!cm_HaveCallback(scp))
return 0;
- if ((bufp->cmFlags
- & (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED))
- == (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED))
+ if ((bufp->cmFlags & (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED)) == (CM_BUF_CMFETCHING | CM_BUF_CMFULLYFETCHED))
+ return 1;
+ if (bufp->dataVersion <= scp->dataVersion && bufp->dataVersion >= scp->bufDataVersionLow)
return 1;
- if (bufp->dataVersion == scp->dataVersion)
+ if (bufp->offset.QuadPart >= scp->serverLength.QuadPart)
return 1;
if (!isBufLocked) {
code = lock_TryMutex(&bufp->mx);
code = bufp->flags & CM_BUF_DIRTY;
/* release lock if we obtained it here */
- if (!isBufLocked)
+ if (!isBufLocked)
lock_ReleaseMutex(&bufp->mx);
/* if buffer was dirty, buffer is acceptable for use */
- if (code)
+ if (code)
return 1;
- else
+ else
return 0;
}
-/* used when deciding whether to do a prefetch or not */
-long cm_CheckFetchRange(cm_scache_t *scp, osi_hyper_t *startBasep, long length,
- cm_user_t *up, cm_req_t *reqp, osi_hyper_t *realBasep)
+/*
+ * used when deciding whether to do a background fetch or not.
+ * call with scp->rw write-locked.
+ */
+afs_int32
+cm_CheckFetchRange(cm_scache_t *scp, osi_hyper_t *startBasep, osi_hyper_t *length,
+ cm_user_t *userp, cm_req_t *reqp, osi_hyper_t *realBasep)
{
- osi_hyper_t toffset;
osi_hyper_t tbase;
+ osi_hyper_t tlength;
+ osi_hyper_t tblocksize;
long code;
cm_buf_t *bp;
int stop;
-
+
/* now scan all buffers in the range, looking for any that look like
* they need work.
*/
tbase = *startBasep;
+ tlength = *length;
+ tblocksize = ConvertLongToLargeInteger(cm_data.buf_blockSize);
stop = 0;
- lock_ObtainMutex(&scp->mx);
- while(length > 0) {
+ while (LargeIntegerGreaterThanZero(tlength)) {
/* get callback so we can do a meaningful dataVersion comparison */
- code = cm_SyncOp(scp, NULL, up, reqp, 0,
+ code = cm_SyncOp(scp, NULL, userp, reqp, 0,
CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
- if (code) {
- scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
- lock_ReleaseMutex(&scp->mx);
+ if (code)
return code;
- }
-
+
if (LargeIntegerGreaterThanOrEqualTo(tbase, scp->length)) {
/* we're past the end of file */
break;
bp = buf_Find(scp, &tbase);
/* We cheat slightly by not locking the bp mutex. */
if (bp) {
- if ((bp->cmFlags
- & (CM_BUF_CMFETCHING | CM_BUF_CMSTORING)) == 0
- && bp->dataVersion != scp->dataVersion)
+ if ((bp->cmFlags & (CM_BUF_CMFETCHING | CM_BUF_CMSTORING | CM_BUF_CMBKGFETCH)) == 0
+ && (bp->dataVersion < scp->bufDataVersionLow || bp->dataVersion > scp->dataVersion))
stop = 1;
buf_Release(bp);
+ bp = NULL;
}
- else
+ else
stop = 1;
/* if this buffer is essentially guaranteed to require a fetch,
* break out here and return this position.
*/
- if (stop)
+ if (stop)
break;
-
- toffset.LowPart = cm_data.buf_blockSize;
- toffset.HighPart = 0;
- tbase = LargeIntegerAdd(toffset, tbase);
- length -= cm_data.buf_blockSize;
+
+ tbase = LargeIntegerAdd(tbase, tblocksize);
+ tlength = LargeIntegerSubtract(tlength, tblocksize);
}
-
- /* if we get here, either everything is fine or stop stopped us at a
+
+ /* if we get here, either everything is fine or 'stop' stopped us at a
* particular buffer in the range that definitely needs to be fetched.
*/
if (stop == 0) {
/* return non-zero code since realBasep won't be valid */
- scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
code = -1;
- }
+ }
else {
/* successfully found a page that will need fetching */
*realBasep = tbase;
code = 0;
}
- lock_ReleaseMutex(&scp->mx);
return code;
}
-void cm_BkgStore(cm_scache_t *scp, long p1, long p2, long p3, long p4,
- cm_user_t *userp)
+afs_int32
+cm_BkgStore(cm_scache_t *scp, afs_uint32 p1, afs_uint32 p2, afs_uint32 p3, afs_uint32 p4,
+ cm_user_t *userp)
{
osi_hyper_t toffset;
long length;
cm_req_t req;
+ long code = 0;
- cm_InitReq(&req);
- req.flags |= CM_REQ_NORETRY;
+ if (scp->flags & CM_SCACHEFLAG_DELETED) {
+ osi_Log4(afsd_logp, "Skipping BKG store - Deleted scp 0x%p, offset 0x%x:%08x, length 0x%x", scp, p2, p1, p3);
+ } else {
+ cm_InitReq(&req);
- toffset.LowPart = p1;
- toffset.HighPart = p2;
- length = p3;
+ /* Retries will be performed by the BkgDaemon thread if appropriate */
+ req.flags |= CM_REQ_NORETRY;
- osi_Log2(afsd_logp, "Starting BKG store vp 0x%x, base 0x%x", scp, p1);
+ toffset.LowPart = p1;
+ toffset.HighPart = p2;
+ length = p3;
- cm_BufWrite(&scp->fid, &toffset, length, /* flags */ 0, userp, &req);
+ osi_Log4(afsd_logp, "Starting BKG store scp 0x%p, offset 0x%x:%08x, length 0x%x", scp, p2, p1, p3);
- lock_ObtainMutex(&scp->mx);
- cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_ASYNCSTORE);
- lock_ReleaseMutex(&scp->mx);
+ code = cm_BufWrite(scp, &toffset, length, /* flags */ 0, userp, &req);
+
+ osi_Log4(afsd_logp, "Finished BKG store scp 0x%p, offset 0x%x:%08x, code 0x%x", scp, p2, p1, code);
+ }
+
+ /*
+ * Keep the following list synchronized with the
+ * error code list in cm_BkgDaemon
+ */
+ switch ( code ) {
+ case CM_ERROR_TIMEDOUT: /* or server restarting */
+ case CM_ERROR_RETRY:
+ case CM_ERROR_WOULDBLOCK:
+ case CM_ERROR_ALLBUSY:
+ case CM_ERROR_ALLDOWN:
+ case CM_ERROR_ALLOFFLINE:
+ case CM_ERROR_PARTIALWRITE:
+ break; /* cm_BkgDaemon will re-insert the request in the queue */
+ case 0:
+ default:
+ lock_ObtainWrite(&scp->rw);
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_ASYNCSTORE);
+ lock_ReleaseWrite(&scp->rw);
+ }
+ return code;
}
-void cm_ClearPrefetchFlag(long code, cm_scache_t *scp, osi_hyper_t *base)
+/* Called with scp locked */
+void cm_ClearPrefetchFlag(long code, cm_scache_t *scp, osi_hyper_t *base, osi_hyper_t *length)
{
- osi_hyper_t thyper;
+ osi_hyper_t end;
if (code == 0) {
- thyper.LowPart = cm_chunkSize;
- thyper.HighPart = 0;
- thyper = LargeIntegerAdd(*base, thyper);
- thyper.LowPart &= (-cm_chunkSize);
+ end = LargeIntegerAdd(*base, *length);
if (LargeIntegerGreaterThan(*base, scp->prefetch.base))
scp->prefetch.base = *base;
- if (LargeIntegerGreaterThan(thyper, scp->prefetch.end))
- scp->prefetch.end = thyper;
+ if (LargeIntegerGreaterThan(end, scp->prefetch.end))
+ scp->prefetch.end = end;
}
scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
}
-/* do the prefetch */
-void cm_BkgPrefetch(cm_scache_t *scp, long p1, long p2, long p3, long p4,
- cm_user_t *userp)
+/* do the prefetch. if the prefetch fails, return 0 (success)
+ * because there is no harm done. */
+afs_int32
+cm_BkgPrefetch(cm_scache_t *scp, afs_uint32 p1, afs_uint32 p2, afs_uint32 p3, afs_uint32 p4,
+ cm_user_t *userp)
{
- long length;
+ osi_hyper_t length;
osi_hyper_t base;
- long code;
- cm_buf_t *bp;
- int cpff = 0; /* cleared prefetch flag */
+ osi_hyper_t offset;
+ osi_hyper_t end;
+ osi_hyper_t fetched;
+ osi_hyper_t tblocksize;
+ afs_int32 code;
+ int rxheld = 0;
+ cm_buf_t *bp = NULL;
cm_req_t req;
cm_InitReq(&req);
+
+ /* Retries will be performed by the BkgDaemon thread if appropriate */
req.flags |= CM_REQ_NORETRY;
-
+
+ fetched.LowPart = 0;
+ fetched.HighPart = 0;
+ tblocksize = ConvertLongToLargeInteger(cm_data.buf_blockSize);
base.LowPart = p1;
base.HighPart = p2;
- length = p3;
-
- osi_Log2(afsd_logp, "Starting BKG prefetch vp 0x%x, base 0x%x", scp, p1);
+ length.LowPart = p3;
+ length.HighPart = p4;
- code = buf_Get(scp, &base, &bp);
+ end = LargeIntegerAdd(base, length);
- lock_ObtainMutex(&scp->mx);
+ osi_Log5(afsd_logp, "Starting BKG prefetch scp 0x%p offset 0x%x:%x length 0x%x:%x",
+ scp, p2, p1, p4, p3);
- if (code || (bp->cmFlags & CM_BUF_CMFETCHING)) {
- scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
- lock_ReleaseMutex(&scp->mx);
- return;
+ for ( code = 0, offset = base;
+ code == 0 && LargeIntegerLessThan(offset, end);
+ offset = LargeIntegerAdd(offset, tblocksize) )
+ {
+ if (rxheld) {
+ lock_ReleaseWrite(&scp->rw);
+ rxheld = 0;
+ }
+
+ code = buf_Get(scp, &offset, &req, &bp);
+ if (code)
+ break;
+
+ if (bp->cmFlags & CM_BUF_CMFETCHING) {
+ /* skip this buffer as another thread is already fetching it */
+ if (!rxheld) {
+ lock_ObtainWrite(&scp->rw);
+ rxheld = 1;
+ }
+ bp->cmFlags &= ~CM_BUF_CMBKGFETCH;
+ buf_Release(bp);
+ bp = NULL;
+ continue;
+ }
+
+ if (!rxheld) {
+ lock_ObtainWrite(&scp->rw);
+ rxheld = 1;
+ }
+
+ code = cm_GetBuffer(scp, bp, NULL, userp, &req);
+ if (code == 0)
+ fetched = LargeIntegerAdd(fetched, tblocksize);
+ buf_Release(bp);
+ bp->cmFlags &= ~CM_BUF_CMBKGFETCH;
+ }
+
+ if (!rxheld) {
+ lock_ObtainWrite(&scp->rw);
+ rxheld = 1;
}
- code = cm_GetBuffer(scp, bp, &cpff, userp, &req);
- if (!cpff)
- cm_ClearPrefetchFlag(code, scp, &base);
- lock_ReleaseMutex(&scp->mx);
- buf_Release(bp);
- return;
+ /* Clear flag from any remaining buffers */
+ for ( ;
+ LargeIntegerLessThan(offset, end);
+ offset = LargeIntegerAdd(offset, tblocksize) )
+ {
+ bp = buf_Find(scp, &offset);
+ if (bp) {
+ bp->cmFlags &= ~CM_BUF_CMBKGFETCH;
+ buf_Release(bp);
+ }
+ }
+ cm_ClearPrefetchFlag(LargeIntegerGreaterThanZero(fetched) ? 0 : code,
+ scp, &base, &fetched);
+
+ /* wakeup anyone who is waiting */
+ if (scp->flags & CM_SCACHEFLAG_WAITING) {
+ osi_Log1(afsd_logp, "CM BkgPrefetch Waking scp 0x%p", scp);
+ osi_Wakeup((LONG_PTR) &scp->flags);
+ }
+ lock_ReleaseWrite(&scp->rw);
+
+ osi_Log4(afsd_logp, "Ending BKG prefetch scp 0x%p code 0x%x fetched 0x%x:%x",
+ scp, code, fetched.HighPart, fetched.LowPart);
+ return code;
}
/* a read was issued to offsetp, and we have to determine whether we should
- * do a prefetch.
+ * do a prefetch of the next chunk.
*/
-void cm_ConsiderPrefetch(cm_scache_t *scp, osi_hyper_t *offsetp,
+void cm_ConsiderPrefetch(cm_scache_t *scp, osi_hyper_t *offsetp, afs_uint32 count,
cm_user_t *userp, cm_req_t *reqp)
{
long code;
+ int rwheld = 0;
osi_hyper_t realBase;
osi_hyper_t readBase;
-
+ osi_hyper_t readLength;
+ osi_hyper_t readEnd;
+ osi_hyper_t offset;
+ osi_hyper_t tblocksize; /* a long long temp variable */
+ cm_buf_t *bp;
+
+ tblocksize = ConvertLongToLargeInteger(cm_data.buf_blockSize);
+
readBase = *offsetp;
/* round up to chunk boundary */
readBase.LowPart += (cm_chunkSize-1);
readBase.LowPart &= (-cm_chunkSize);
- lock_ObtainMutex(&scp->mx);
+ readLength = ConvertLongToLargeInteger(count);
+
+ lock_ObtainWrite(&scp->rw);
+ rwheld = 1;
if ((scp->flags & CM_SCACHEFLAG_PREFETCHING)
|| LargeIntegerLessThanOrEqualTo(readBase, scp->prefetch.base)) {
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
return;
}
scp->flags |= CM_SCACHEFLAG_PREFETCHING;
if (LargeIntegerGreaterThan(scp->prefetch.end, readBase))
readBase = scp->prefetch.end;
- lock_ReleaseMutex(&scp->mx);
-
- code = cm_CheckFetchRange(scp, &readBase, cm_chunkSize, userp, reqp,
+ code = cm_CheckFetchRange(scp, &readBase, &readLength, userp, reqp,
&realBase);
- if (code)
+ if (code) {
+ scp->flags &= ~CM_SCACHEFLAG_PREFETCHING;
+ lock_ReleaseWrite(&scp->rw);
return; /* can't find something to prefetch */
+ }
+
+ readEnd = LargeIntegerAdd(realBase, readLength);
+
+ /*
+ * Mark each buffer in the range as queued for a
+ * background fetch
+ */
+ for ( offset = realBase;
+ LargeIntegerLessThan(offset, readEnd);
+ offset = LargeIntegerAdd(offset, tblocksize) )
+ {
+ if (rwheld) {
+ lock_ReleaseWrite(&scp->rw);
+ rwheld = 0;
+ }
+
+ bp = buf_Find(scp, &offset);
+ if (!bp)
+ continue;
+
+ if (!rwheld) {
+ lock_ObtainWrite(&scp->rw);
+ rwheld = 1;
+ }
- osi_Log2(afsd_logp, "BKG Prefetch request vp 0x%x, base 0x%x",
+ bp->cmFlags |= CM_BUF_CMBKGFETCH;
+ buf_Release(bp);
+ }
+
+ if (rwheld)
+ lock_ReleaseWrite(&scp->rw);
+
+ osi_Log2(afsd_logp, "BKG Prefetch request scp 0x%p, base 0x%x",
scp, realBase.LowPart);
- cm_QueueBKGRequest(scp, cm_BkgPrefetch, realBase.LowPart,
- realBase.HighPart, cm_chunkSize, 0, userp);
+ cm_QueueBKGRequest(scp, cm_BkgPrefetch,
+ realBase.LowPart, realBase.HighPart,
+ readLength.LowPart, readLength.HighPart,
+ userp);
}
/* scp must be locked; temporarily unlocked during processing.
long temp;
long code;
long flags; /* flags to cm_SyncOp */
-
+
/* clear things out */
- biop->scp = scp; /* don't hold */
+ biop->scp = scp; /* do not hold; held by caller */
biop->offset = *inOffsetp;
biop->length = 0;
biop->bufListp = NULL;
biop->reserved = 0;
/* reserve a chunk's worth of buffers */
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
buf_ReserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
- lock_ObtainMutex(&scp->mx);
+ lock_ObtainWrite(&scp->rw);
bufp = NULL;
- for (temp = 0; temp < inSize; temp += cm_data.buf_blockSize, bufp = NULL) {
- thyper.HighPart = 0;
- thyper.LowPart = temp;
+ for (temp = 0; temp < inSize; temp += cm_data.buf_blockSize) {
+ thyper = ConvertLongToLargeInteger(temp);
tbase = LargeIntegerAdd(*inOffsetp, thyper);
bufp = buf_Find(scp, &tbase);
if (bufp) {
/* get buffer mutex and scp mutex safely */
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
lock_ObtainMutex(&bufp->mx);
- lock_ObtainMutex(&scp->mx);
- flags = CM_SCACHESYNC_NEEDCALLBACK
- | CM_SCACHESYNC_GETSTATUS
- | CM_SCACHESYNC_STOREDATA
- | CM_SCACHESYNC_BUFLOCKED;
- code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
+ /*
+ * if the buffer is actively involved in I/O
+ * we wait for the I/O to complete.
+ */
+ if (bufp->flags & (CM_BUF_WRITING|CM_BUF_READING))
+ buf_WaitIO(scp, bufp);
+
+ lock_ObtainWrite(&scp->rw);
+ flags = CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_STOREDATA | CM_SCACHESYNC_BUFLOCKED;
+ code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
if (code) {
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
+ bufp = NULL;
buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
return code;
- }
-
+ }
+
/* if the buffer is dirty, we're done */
if (bufp->flags & CM_BUF_DIRTY) {
osi_assertx(!(bufp->flags & CM_BUF_WRITING),
cm_SyncOpDone(scp, bufp, flags);
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
- }
+ bufp = NULL;
+ }
}
biop->reserved = 1;
-
+
/* if we get here, if bufp is null, we didn't find any dirty buffers
* that weren't already being stored back, so we just quit now.
*/
/* don't need buffer mutex any more */
lock_ReleaseMutex(&bufp->mx);
-
+
/* put this element in the list */
qdp = osi_QDAlloc();
osi_SetQData(qdp, bufp);
biop->length = cm_data.buf_blockSize;
firstModOffset = bufp->offset;
biop->offset = firstModOffset;
+ bufp = NULL; /* this buffer and reference added to the queue */
/* compute the window surrounding *inOffsetp of size cm_chunkSize */
scanStart = *inOffsetp;
scanStart.LowPart &= (-cm_chunkSize);
- thyper.LowPart = cm_chunkSize;
- thyper.HighPart = 0;
+ thyper = ConvertLongToLargeInteger(cm_chunkSize);
scanEnd = LargeIntegerAdd(scanStart, thyper);
- flags = CM_SCACHESYNC_NEEDCALLBACK
- | CM_SCACHESYNC_GETSTATUS
+ flags = CM_SCACHESYNC_GETSTATUS
| CM_SCACHESYNC_STOREDATA
| CM_SCACHESYNC_BUFLOCKED
| CM_SCACHESYNC_NOWAIT;
/* start by looking backwards until scanStart */
- thyper.HighPart = 0; /* hyper version of cm_data.buf_blockSize */
- thyper.LowPart = cm_data.buf_blockSize;
+ /* hyper version of cm_data.buf_blockSize */
+ thyper = ConvertLongToLargeInteger(cm_data.buf_blockSize);
tbase = LargeIntegerSubtract(firstModOffset, thyper);
while(LargeIntegerGreaterThanOrEqualTo(tbase, scanStart)) {
/* see if we can find the buffer */
bufp = buf_Find(scp, &tbase);
- if (!bufp)
+ if (!bufp)
break;
/* try to lock it, and quit if we can't (simplifies locking) */
+ lock_ReleaseWrite(&scp->rw);
code = lock_TryMutex(&bufp->mx);
+ lock_ObtainWrite(&scp->rw);
if (code == 0) {
buf_Release(bufp);
+ bufp = NULL;
break;
}
-
+
code = cm_SyncOp(scp, bufp, userp, reqp, 0, flags);
if (code) {
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
+ bufp = NULL;
break;
}
-
+
if (!(bufp->flags & CM_BUF_DIRTY)) {
/* buffer is clean, so we shouldn't add it */
cm_SyncOpDone(scp, bufp, flags);
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
+ bufp = NULL;
break;
}
osi_QAddT((osi_queue_t **) &biop->bufListp,
(osi_queue_t **) &biop->bufListEndp,
&qdp->q);
+ bufp = NULL; /* added to the queue */
/* update biod info describing the transfer */
biop->offset = LargeIntegerSubtract(biop->offset, thyper);
} /* while loop looking for pages preceding the one we found */
/* now, find later dirty, contiguous pages, and add them to the list */
- thyper.HighPart = 0; /* hyper version of cm_data.buf_blockSize */
- thyper.LowPart = cm_data.buf_blockSize;
+ /* hyper version of cm_data.buf_blockSize */
+ thyper = ConvertLongToLargeInteger(cm_data.buf_blockSize);
tbase = LargeIntegerAdd(firstModOffset, thyper);
while(LargeIntegerLessThan(tbase, scanEnd)) {
/* see if we can find the buffer */
bufp = buf_Find(scp, &tbase);
- if (!bufp)
+ if (!bufp)
break;
/* try to lock it, and quit if we can't (simplifies locking) */
+ lock_ReleaseWrite(&scp->rw);
code = lock_TryMutex(&bufp->mx);
+ lock_ObtainWrite(&scp->rw);
if (code == 0) {
buf_Release(bufp);
+ bufp = NULL;
break;
}
if (code) {
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
+ bufp = NULL;
break;
}
-
+
if (!(bufp->flags & CM_BUF_DIRTY)) {
/* buffer is clean, so we shouldn't add it */
cm_SyncOpDone(scp, bufp, flags);
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
+ bufp = NULL;
break;
}
osi_QAddH((osi_queue_t **) &biop->bufListp,
(osi_queue_t **) &biop->bufListEndp,
&qdp->q);
+ bufp = NULL;
/* update biod info describing the transfer */
biop->length += cm_data.buf_blockSize;
-
+
/* update loop pointer */
tbase = LargeIntegerAdd(tbase, thyper);
} /* while loop looking for pages following the first page we found */
-
+
/* finally, we're done */
return 0;
}
* If an error is returned, we don't return any buffers.
*/
long cm_SetupFetchBIOD(cm_scache_t *scp, osi_hyper_t *offsetp,
- cm_bulkIO_t *biop, cm_user_t *up, cm_req_t *reqp)
+ cm_bulkIO_t *biop, cm_user_t *userp, cm_req_t *reqp)
{
long code;
cm_buf_t *tbp;
- osi_hyper_t toffset; /* a long long temp variable */
+ osi_hyper_t tblocksize; /* a long long temp variable */
osi_hyper_t pageBase; /* base offset we're looking at */
osi_queueData_t *qdp; /* one temp queue structure */
osi_queueData_t *tqdp; /* another temp queue structure */
osi_queueData_t *heldBufListEndp; /* first one */
int reserving;
- biop->scp = scp;
+ tblocksize = ConvertLongToLargeInteger(cm_data.buf_blockSize);
+
+ biop->scp = scp; /* do not hold; held by caller */
biop->offset = *offsetp;
/* null out the list of buffers */
biop->bufListp = biop->bufListEndp = NULL;
biop->reserved = 0;
/* first lookup the file's length, so we know when to stop */
- code = cm_SyncOp(scp, NULL, up, reqp, 0,
+ code = cm_SyncOp(scp, NULL, userp, reqp, 0,
CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
- if (code)
+ if (code)
return code;
-
+
/* copy out size, since it may change */
fileSize = scp->serverLength;
-
- lock_ReleaseMutex(&scp->mx);
+
+ lock_ReleaseWrite(&scp->rw);
pageBase = *offsetp;
collected = pageBase.LowPart & (cm_chunkSize - 1);
/* first hold all buffers, since we can't hold any locks in buf_Get */
while (1) {
/* stop at chunk boundary */
- if (collected >= cm_chunkSize) break;
-
- /* see if the next page would be past EOF */
- if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize)) break;
+ if (collected >= cm_chunkSize)
+ break;
- lock_ObtainMutex(&cm_bufGetMutex);
+ /* see if the next page would be past EOF */
+ if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize))
+ break;
- code = buf_Get(scp, &pageBase, &tbp);
+ code = buf_Get(scp, &pageBase, reqp, &tbp);
if (code) {
- lock_ReleaseMutex(&cm_bufGetMutex);
- lock_ObtainMutex(&scp->mx);
+ lock_ObtainWrite(&scp->rw);
+ cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
return code;
}
-
- buf_Release(tbp);
- lock_ReleaseMutex(&cm_bufGetMutex);
+ buf_Release(tbp);
+ tbp = NULL;
- toffset.HighPart = 0;
- toffset.LowPart = cm_data.buf_blockSize;
- pageBase = LargeIntegerAdd(toffset, pageBase);
+ pageBase = LargeIntegerAdd(tblocksize, pageBase);
collected += cm_data.buf_blockSize;
}
/* now hold all buffers, if they are still there */
while (1) {
/* stop at chunk boundary */
- if (collected >= cm_chunkSize)
+ if (collected >= cm_chunkSize)
break;
-
+
/* see if the next page would be past EOF */
- if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize))
+ if (LargeIntegerGreaterThanOrEqualTo(pageBase, fileSize))
break;
tbp = buf_Find(scp, &pageBase);
- if (!tbp)
+ if (!tbp)
break;
/* add the buffer to the list */
qdp = osi_QDAlloc();
osi_SetQData(qdp, tbp);
- osi_QAdd((osi_queue_t **)&heldBufListp, &qdp->q);
- if (!heldBufListEndp) heldBufListEndp = qdp;
+ osi_QAddH((osi_queue_t **)&heldBufListp,
+ (osi_queue_t **)&heldBufListEndp,
+ &qdp->q);
/* leave tbp held (from buf_Get) */
- if (!reserving)
+ if (!reserving)
break;
collected += cm_data.buf_blockSize;
- toffset.HighPart = 0;
- toffset.LowPart = cm_data.buf_blockSize;
- pageBase = LargeIntegerAdd(toffset, pageBase);
+ pageBase = LargeIntegerAdd(tblocksize, pageBase);
}
/* look at each buffer, adding it into the list if it looks idle and
/* now lock the buffer lock */
lock_ObtainMutex(&tbp->mx);
- lock_ObtainMutex(&scp->mx);
+ lock_ObtainWrite(&scp->rw);
/* don't bother fetching over data that is already current */
- if (tbp->dataVersion == scp->dataVersion) {
+ if (tbp->dataVersion <= scp->dataVersion && tbp->dataVersion >= scp->bufDataVersionLow) {
/* we don't need this buffer, since it is current */
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
lock_ReleaseMutex(&tbp->mx);
break;
}
- flags = CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_FETCHDATA
- | CM_SCACHESYNC_BUFLOCKED;
- if (!isFirst)
+ flags = CM_SCACHESYNC_FETCHDATA | CM_SCACHESYNC_BUFLOCKED;
+ if (!isFirst)
flags |= CM_SCACHESYNC_NOWAIT;
/* wait for the buffer to serialize, if required. Doesn't
* release the scp or buffer lock(s) if NOWAIT is specified.
*/
- code = cm_SyncOp(scp, tbp, up, reqp, 0, flags);
+ code = cm_SyncOp(scp, tbp, userp, reqp, 0, flags);
if (code) {
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
lock_ReleaseMutex(&tbp->mx);
break;
}
-
+
/* don't fetch over dirty buffers */
if (tbp->flags & CM_BUF_DIRTY) {
cm_SyncOpDone(scp, tbp, flags);
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
lock_ReleaseMutex(&tbp->mx);
break;
}
/* Release locks */
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
lock_ReleaseMutex(&tbp->mx);
/* add the buffer to the list */
qdp = osi_QDAlloc();
osi_SetQData(qdp, tbp);
- osi_QAdd((osi_queue_t **)&biop->bufListp, &qdp->q);
- if (!biop->bufListEndp)
- biop->bufListEndp = qdp;
+ osi_QAddH((osi_queue_t **)&biop->bufListp,
+ (osi_queue_t **)&biop->bufListEndp,
+ &qdp->q);
buf_Hold(tbp);
/* from now on, a failure just stops our collection process, but
isFirst = 0;
collected += cm_data.buf_blockSize;
}
-
+
/* now, we've held in biop->bufListp all the buffer's we're really
* interested in. We also have holds left from heldBufListp, and we
* now release those holds on the buffers.
for (qdp = heldBufListp; qdp; qdp = tqdp) {
tqdp = (osi_queueData_t *) osi_QNext(&qdp->q);
tbp = osi_GetQData(qdp);
+ osi_QRemoveHT((osi_queue_t **) &heldBufListp,
+ (osi_queue_t **) &heldBufListEndp,
+ &qdp->q);
osi_QDFree(qdp);
buf_Release(tbp);
+ tbp = NULL;
}
/* Caller expects this */
- lock_ObtainMutex(&scp->mx);
-
+ lock_ObtainWrite(&scp->rw);
+
/* if we got a failure setting up the first buffer, then we don't have
* any side effects yet, and we also have failed an operation that the
* caller requires to make any progress. Give up now.
buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
return code;
}
-
+
/* otherwise, we're still OK, and should just return the I/O setup we've
* got.
*/
/* release a bulk I/O structure that was setup by cm_SetupFetchBIOD or by
* cm_SetupStoreBIOD
*/
-void cm_ReleaseBIOD(cm_bulkIO_t *biop, int isStore)
+void cm_ReleaseBIOD(cm_bulkIO_t *biop, int isStore, long code, int scp_locked)
{
- cm_scache_t *scp;
+ cm_scache_t *scp; /* do not release; not held in biop */
cm_buf_t *bufp;
osi_queueData_t *qdp;
osi_queueData_t *nqdp;
/* Give back reserved buffers */
if (biop->reserved)
buf_UnreserveBuffers(cm_chunkSize / cm_data.buf_blockSize);
-
- flags = CM_SCACHESYNC_NEEDCALLBACK;
+
if (isStore)
- flags |= CM_SCACHESYNC_STOREDATA;
+ flags = CM_SCACHESYNC_STOREDATA;
else
- flags |= CM_SCACHESYNC_FETCHDATA;
+ flags = CM_SCACHESYNC_FETCHDATA;
scp = biop->scp;
- for(qdp = biop->bufListp; qdp; qdp = nqdp) {
- /* lookup next guy first, since we're going to free this one */
- nqdp = (osi_queueData_t *) osi_QNext(&qdp->q);
-
- /* extract buffer and free queue data */
- bufp = osi_GetQData(qdp);
- osi_QDFree(qdp);
-
- /* now, mark I/O as done, unlock the buffer and release it */
- lock_ObtainMutex(&bufp->mx);
- lock_ObtainMutex(&scp->mx);
- cm_SyncOpDone(scp, bufp, flags);
- lock_ReleaseMutex(&scp->mx);
-
- /* turn off writing and wakeup users */
- if (isStore) {
- if (bufp->flags & CM_BUF_WAITING) {
- osi_Wakeup((long) bufp);
- }
- bufp->flags &= ~(CM_BUF_WAITING | CM_BUF_WRITING | CM_BUF_DIRTY);
- }
-
- lock_ReleaseMutex(&bufp->mx);
- buf_Release(bufp);
+ if (biop->bufListp) {
+ for(qdp = biop->bufListp; qdp; qdp = nqdp) {
+ /* lookup next guy first, since we're going to free this one */
+ nqdp = (osi_queueData_t *) osi_QNext(&qdp->q);
+
+ /* extract buffer and free queue data */
+ bufp = osi_GetQData(qdp);
+ osi_QRemoveHT((osi_queue_t **) &biop->bufListp,
+ (osi_queue_t **) &biop->bufListEndp,
+ &qdp->q);
+ osi_QDFree(qdp);
+
+ /* now, mark I/O as done, unlock the buffer and release it */
+ if (scp_locked)
+ lock_ReleaseWrite(&scp->rw);
+ lock_ObtainMutex(&bufp->mx);
+ lock_ObtainWrite(&scp->rw);
+ cm_SyncOpDone(scp, bufp, flags);
+
+ /* turn off writing and wakeup users */
+ if (isStore) {
+ if (bufp->flags & CM_BUF_WAITING) {
+ osi_Log2(afsd_logp, "cm_ReleaseBIOD Waking [scp 0x%p] bp 0x%p", scp, bufp);
+ osi_Wakeup((LONG_PTR) bufp);
+ }
+ if (code) {
+ bufp->flags &= ~CM_BUF_WRITING;
+ 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 fatal error to this buffer.
+ */
+ bufp->flags &= ~CM_BUF_DIRTY;
+ bufp->flags |= CM_BUF_ERROR;
+ bufp->dirty_offset = 0;
+ bufp->dirty_length = 0;
+ bufp->error = code;
+ bufp->dataVersion = CM_BUF_VERSION_BAD;
+ bufp->dirtyCounter++;
+ break;
+ case CM_ERROR_TIMEDOUT:
+ case CM_ERROR_ALLDOWN:
+ case CM_ERROR_ALLBUSY:
+ case CM_ERROR_ALLOFFLINE:
+ case CM_ERROR_CLOCKSKEW:
+ default:
+ /* do not mark the buffer in error state but do
+ * not attempt to complete the rest either.
+ */
+ break;
+ }
+ } else {
+ bufp->flags &= ~(CM_BUF_WRITING | CM_BUF_DIRTY);
+ bufp->dirty_offset = bufp->dirty_length = 0;
+ }
+ }
+
+ if (!scp_locked)
+ lock_ReleaseWrite(&scp->rw);
+ lock_ReleaseMutex(&bufp->mx);
+ buf_Release(bufp);
+ bufp = NULL;
+ }
+ } else {
+ if (!scp_locked)
+ lock_ObtainWrite(&scp->rw);
+ cm_SyncOpDone(scp, NULL, flags);
+ if (!scp_locked)
+ lock_ReleaseWrite(&scp->rw);
}
/* clean things out */
biop->bufListp = NULL;
biop->bufListEndp = NULL;
-}
+}
+
+static int
+cm_CloneStatus(cm_scache_t *scp, cm_user_t *userp, int scp_locked,
+ AFSFetchStatus *afsStatusp, AFSVolSync *volSyncp)
+{
+ // setup the status based upon the scp data
+ afsStatusp->InterfaceVersion = 0x1;
+ switch (scp->fileType) {
+ case CM_SCACHETYPE_FILE:
+ afsStatusp->FileType = File;
+ break;
+ case CM_SCACHETYPE_DIRECTORY:
+ afsStatusp->FileType = Directory;
+ break;
+ case CM_SCACHETYPE_MOUNTPOINT:
+ afsStatusp->FileType = SymbolicLink;
+ break;
+ case CM_SCACHETYPE_SYMLINK:
+ case CM_SCACHETYPE_DFSLINK:
+ afsStatusp->FileType = SymbolicLink;
+ break;
+ default:
+ afsStatusp->FileType = -1; /* an invalid value */
+ }
+ afsStatusp->LinkCount = scp->linkCount;
+ afsStatusp->Length = scp->length.LowPart;
+ afsStatusp->DataVersion = (afs_uint32)(scp->dataVersion & MAX_AFS_UINT32);
+ afsStatusp->Author = 0x1;
+ afsStatusp->Owner = scp->owner;
+ if (!scp_locked) {
+ lock_ObtainWrite(&scp->rw);
+ scp_locked = 1;
+ }
+ if (cm_FindACLCache(scp, userp, &afsStatusp->CallerAccess))
+ afsStatusp->CallerAccess = scp->anyAccess;
+ afsStatusp->AnonymousAccess = scp->anyAccess;
+ afsStatusp->UnixModeBits = scp->unixModeBits;
+ afsStatusp->ParentVnode = scp->parentVnode;
+ afsStatusp->ParentUnique = scp->parentUnique;
+ afsStatusp->ResidencyMask = 0;
+ afsStatusp->ClientModTime = scp->clientModTime;
+ afsStatusp->ServerModTime = scp->serverModTime;
+ afsStatusp->Group = scp->group;
+ afsStatusp->SyncCounter = 0;
+ afsStatusp->dataVersionHigh = (afs_uint32)(scp->dataVersion >> 32);
+ afsStatusp->lockCount = 0;
+ afsStatusp->Length_hi = scp->length.HighPart;
+ afsStatusp->errorCode = 0;
+
+ volSyncp->spare1 = scp->volumeCreationDate;
+
+ return scp_locked;
+}
/* Fetch a buffer. Called with scp locked.
* The scp is locked on return.
*/
-long cm_GetBuffer(cm_scache_t *scp, cm_buf_t *bufp, int *cpffp, cm_user_t *up,
+long cm_GetBuffer(cm_scache_t *scp, cm_buf_t *bufp, int *cpffp, cm_user_t *userp,
cm_req_t *reqp)
{
- long code;
- long nbytes; /* bytes in transfer */
+ long code=0, code1=0;
+ afs_uint32 nbytes; /* bytes in transfer */
+ afs_uint32 nbytes_hi = 0; /* high-order 32 bits of bytes in transfer */
+ afs_uint64 length_found = 0;
long rbytes; /* bytes in rx_Read call */
long temp;
AFSFetchStatus afsStatus;
AFSCallBack callback;
AFSVolSync volSync;
char *bufferp;
- cm_buf_t *tbufp; /* buf we're filling */
+ afs_uint32 buffer_offset;
+ cm_buf_t *tbufp; /* buf we're filling */
osi_queueData_t *qdp; /* q element we're scanning */
AFSFid tfid;
- struct rx_call *oldCallp, *callp;
+ struct rx_call *rxcallp;
+ struct rx_connection *rxconnp;
cm_bulkIO_t biod; /* bulk IO descriptor */
cm_conn_t *connp;
int getroot;
- long t1, t2;
+ afs_int32 t1,t2;
+ int require_64bit_ops = 0;
+ int call_was_64bit = 0;
+ int fs_fetchdata_offset_bug = 0;
+ int first_read = 1;
+ int scp_locked = 1;
+
+ memset(&volSync, 0, sizeof(volSync));
- /* now, the buffer may or may not be filled with good data (buf_GetNew
+ /* now, the buffer may or may not be filled with good data (buf_GetNewLocked
* drops lots of locks, and may indeed return a properly initialized
* buffer, although more likely it will just return a new, empty, buffer.
*/
osi_Log1(afsd_logp,"GetBuffer returns cm_data.rootSCachep=%x",cm_data.rootSCachep);
#endif
+ if (cm_HaveCallback(scp) && bufp->dataVersion <= scp->dataVersion && bufp->dataVersion >= scp->bufDataVersionLow) {
+ /* We already have this buffer don't do extra work */
+ return 0;
+ }
+
cm_AFSFidFromFid(&tfid, &scp->fid);
- code = cm_SetupFetchBIOD(scp, &bufp->offset, &biod, up, reqp);
+ code = cm_SetupFetchBIOD(scp, &bufp->offset, &biod, userp, reqp);
if (code) {
/* couldn't even get the first page setup properly */
- osi_Log1(afsd_logp, "SetupFetchBIOD failure code %d", code);
+ osi_Log1(afsd_logp, "GetBuffer: SetupFetchBIOD failure code %d", code);
return code;
}
* We can lose a race condition and end up with biod.length zero, in
* which case we just retry.
*/
- if (bufp->dataVersion == scp->dataVersion || biod.length == 0) {
- osi_Log3(afsd_logp, "Bad DVs %d, %d or length 0x%x",
- bufp->dataVersion, scp->dataVersion, biod.length);
- if ((bufp->dataVersion == -1
- || bufp->dataVersion < scp->dataVersion)
- && LargeIntegerGreaterThanOrEqualTo(bufp->offset,
- scp->serverLength)) {
- if (bufp->dataVersion == -1)
+ if (bufp->dataVersion <= scp->dataVersion && bufp->dataVersion >= scp->bufDataVersionLow || biod.length == 0) {
+ if ((bufp->dataVersion == CM_BUF_VERSION_BAD || bufp->dataVersion < scp->bufDataVersionLow) &&
+ LargeIntegerGreaterThanOrEqualTo(bufp->offset, scp->serverLength))
+ {
+ osi_Log4(afsd_logp, "Bad DVs 0x%x != (0x%x -> 0x%x) or length 0x%x",
+ bufp->dataVersion, scp->bufDataVersionLow, scp->dataVersion, biod.length);
+
+ if (bufp->dataVersion == CM_BUF_VERSION_BAD)
memset(bufp->datap, 0, cm_data.buf_blockSize);
bufp->dataVersion = scp->dataVersion;
}
- lock_ReleaseMutex(&scp->mx);
- cm_ReleaseBIOD(&biod, 0);
- lock_ObtainMutex(&scp->mx);
+ cm_ReleaseBIOD(&biod, 0, 0, 1);
+ return 0;
+ } else if ((bufp->dataVersion == CM_BUF_VERSION_BAD || bufp->dataVersion < scp->bufDataVersionLow)
+ && (scp->mask & CM_SCACHEMASK_TRUNCPOS) &&
+ LargeIntegerGreaterThanOrEqualTo(bufp->offset, scp->truncPos)) {
+ memset(bufp->datap, 0, cm_data.buf_blockSize);
+ bufp->dataVersion = scp->dataVersion;
+ cm_ReleaseBIOD(&biod, 0, 0, 1);
return 0;
}
-
- lock_ReleaseMutex(&scp->mx);
-#ifdef DISKCACHE95
- DPRINTF("cm_GetBuffer: fetching data scpDV=%d bufDV=%d scp=%x bp=%x dcp=%x\n",
- scp->dataVersion, bufp->dataVersion, scp, bufp, bufp->dcp);
-#endif /* DISKCACHE95 */
+ lock_ReleaseWrite(&scp->rw);
+ scp_locked = 0;
+
+ if (LargeIntegerGreaterThan(LargeIntegerAdd(biod.offset,
+ ConvertLongToLargeInteger(biod.length)),
+ ConvertLongToLargeInteger(LONG_MAX))) {
+ require_64bit_ops = 1;
+ }
+
+ osi_Log2(afsd_logp, "cm_GetBuffer: fetching data scp %p bufp %p", scp, bufp);
+ osi_Log3(afsd_logp, "cm_GetBuffer: fetching data scpDV 0x%x scpDVLow 0x%x bufDV 0x%x",
+ scp->dataVersion, scp->bufDataVersionLow, bufp->dataVersion);
#ifdef AFS_FREELANCE_CLIENT
// yj code
// if getroot then we don't need to make any calls
// just return fake data
-
+
if (cm_freelanceEnabled && getroot) {
- // setup the fake status
+ // setup the fake status
afsStatus.InterfaceVersion = 0x1;
afsStatus.FileType = 0x2;
afsStatus.LinkCount = scp->linkCount;
afsStatus.Length = cm_fakeDirSize;
- afsStatus.DataVersion = cm_data.fakeDirVersion;
+ afsStatus.DataVersion = (afs_uint32)(cm_data.fakeDirVersion & 0xFFFFFFFF);
afsStatus.Author = 0x1;
afsStatus.Owner = 0x0;
afsStatus.CallerAccess = 0x9;
afsStatus.ServerModTime = (afs_uint32)FakeFreelanceModTime;
afsStatus.Group = 0;
afsStatus.SyncCounter = 0;
- afsStatus.dataVersionHigh = 0;
+ afsStatus.dataVersionHigh = (afs_uint32)(cm_data.fakeDirVersion >> 32);
afsStatus.lockCount = 0;
afsStatus.Length_hi = 0;
afsStatus.errorCode = 0;
-
+ memset(&volSync, 0, sizeof(volSync));
+
// once we're done setting up the status info,
// we just fill the buffer pages with fakedata
// from cm_FakeRootDir. Extra pages are set to
- // 0.
-
+ // 0.
+
lock_ObtainMutex(&cm_Freelance_Lock);
t1 = bufp->offset.LowPart;
qdp = biod.bufListEndp;
bufferp=tbufp->datap;
memset(bufferp, 0, cm_data.buf_blockSize);
t2 = cm_fakeDirSize - t1;
- if (t2>cm_data.buf_blockSize) t2=cm_data.buf_blockSize;
+ if (t2> (afs_int32)cm_data.buf_blockSize)
+ t2=cm_data.buf_blockSize;
if (t2 > 0) {
memcpy(bufferp, cm_FakeRootDir+t1, t2);
} else {
}
lock_ReleaseMutex(&cm_Freelance_Lock);
-
+
// once we're done, we skip over the part of the
// code that does the ACTUAL fetching of data for
// real files
#endif /* AFS_FREELANCE_CLIENT */
- /* now make the call */
+ /*
+ * if the requested offset is greater than the file length,
+ * the file server will return zero bytes of data and the
+ * current status for the file which we already have since
+ * we have just obtained a callback. Instead, we can avoid
+ * the network round trip by allocating zeroed buffers and
+ * faking the status info.
+ */
+ if (biod.offset.QuadPart >= scp->length.QuadPart) {
+ osi_Log5(afsd_logp, "SKIP FetchData64 scp 0x%p, off 0x%x:%08x > length 0x%x:%08x",
+ scp, biod.offset.HighPart, biod.offset.LowPart,
+ scp->length.HighPart, scp->length.LowPart);
+
+ /* Clone the current status info */
+ scp_locked = cm_CloneStatus(scp, userp, scp_locked, &afsStatus, &volSync);
+
+ /* status info complete, fill pages with zeros */
+ for (qdp = biod.bufListEndp;
+ qdp;
+ qdp = (osi_queueData_t *) osi_QPrev(&qdp->q)) {
+ tbufp = osi_GetQData(qdp);
+ bufferp=tbufp->datap;
+ memset(bufferp, 0, cm_data.buf_blockSize);
+ }
+
+ /* no need to contact the file server */
+ goto fetchingcompleted;
+ }
+
+ if (scp_locked) {
+ lock_ReleaseWrite(&scp->rw);
+ scp_locked = 0;
+ }
+
+ /* now make the call */
do {
- code = cm_Conn(&scp->fid, up, reqp, &connp);
- if (code)
+ code = cm_ConnFromFID(&scp->fid, userp, reqp, &connp);
+ if (code)
continue;
-
- oldCallp = cm_GetRxConn(connp);
- callp = rx_NewCall(oldCallp);
- rx_PutConnection(oldCallp);
-
- osi_Log3(afsd_logp, "CALL FetchData vp %x, off 0x%x, size 0x%x",
- (long) scp, biod.offset.LowPart, biod.length);
-
- code = StartRXAFS_FetchData(callp, &tfid, biod.offset.LowPart,
- biod.length);
-
- /* now copy the data out of the pipe and put it in the buffer */
- temp = rx_Read(callp, (char *)&nbytes, 4);
- if (temp == 4) {
- nbytes = ntohl(nbytes);
- if (nbytes > biod.length)
- code = (callp->error < 0) ? callp->error : -1;
+
+ rxconnp = cm_GetRxConn(connp);
+ rxcallp = rx_NewCall(rxconnp);
+ rx_PutConnection(rxconnp);
+
+ nbytes = nbytes_hi = 0;
+
+ if (SERVERHAS64BIT(connp)) {
+ call_was_64bit = 1;
+
+ osi_Log4(afsd_logp, "CALL FetchData64 scp 0x%p, off 0x%x:%08x, size 0x%x",
+ scp, biod.offset.HighPart, biod.offset.LowPart, biod.length);
+
+ code = StartRXAFS_FetchData64(rxcallp, &tfid, biod.offset.QuadPart, biod.length);
+
+ if (code == 0) {
+ temp = rx_Read32(rxcallp, &nbytes_hi);
+ if (temp == sizeof(afs_int32)) {
+ nbytes_hi = ntohl(nbytes_hi);
+ } else {
+ nbytes_hi = 0;
+ code = rxcallp->error;
+ code1 = rx_EndCall(rxcallp, code);
+ rxcallp = NULL;
+ }
+ }
+ } else {
+ call_was_64bit = 0;
+ }
+
+ if (code == RXGEN_OPCODE || !SERVERHAS64BIT(connp)) {
+ if (require_64bit_ops) {
+ osi_Log0(afsd_logp, "Skipping FetchData. Operation requires FetchData64");
+ code = CM_ERROR_TOOBIG;
+ } else {
+ if (!rxcallp) {
+ rxconnp = cm_GetRxConn(connp);
+ rxcallp = rx_NewCall(rxconnp);
+ rx_PutConnection(rxconnp);
+ }
+
+ osi_Log3(afsd_logp, "CALL FetchData scp 0x%p, off 0x%x, size 0x%x",
+ scp, biod.offset.LowPart, biod.length);
+
+ code = StartRXAFS_FetchData(rxcallp, &tfid, biod.offset.LowPart,
+ biod.length);
+
+ SET_SERVERHASNO64BIT(connp);
+ }
}
- else
- code = (callp->error < 0) ? callp->error : -1;
+
+ if (code == 0) {
+ temp = rx_Read32(rxcallp, &nbytes);
+ if (temp == sizeof(afs_int32)) {
+ nbytes = ntohl(nbytes);
+ FillInt64(length_found, nbytes_hi, nbytes);
+ if (length_found > biod.length) {
+ /*
+ * prior to 1.4.12 and 1.5.65 the file server would return
+ * (filesize - offset) if the requested offset was greater than
+ * the filesize. The correct return value would have been zero.
+ * Force a retry by returning an RX_PROTOCOL_ERROR. If the cause
+ * is a race between two RPCs issues by this cache manager, the
+ * correct thing will happen the second time.
+ */
+ osi_Log0(afsd_logp, "cm_GetBuffer length_found > biod.length");
+ fs_fetchdata_offset_bug = 1;
+ }
+ } else {
+ osi_Log1(afsd_logp, "cm_GetBuffer rx_Read32 returns %d != 4", temp);
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
+ }
+ }
+ /* for the moment, nbytes_hi will always be 0 if code == 0
+ because biod.length is a 32-bit quantity. */
if (code == 0) {
qdp = biod.bufListEndp;
if (qdp) {
tbufp = osi_GetQData(qdp);
bufferp = tbufp->datap;
+ buffer_offset = 0;
}
- else
+ else
bufferp = NULL;
- /* fill nbytes of data from the pipe into the pages.
+
+ /* fill length_found of data from the pipe into the pages.
* When we stop, qdp will point at the last page we're
* dealing with, and bufferp will tell us where we
* stopped. We'll need this info below when we clear
* the remainder of the last page out (and potentially
* clear later pages out, if we fetch past EOF).
*/
- while (nbytes > 0) {
+ while (length_found > 0) {
+#ifdef USE_RX_IOVEC
+ struct iovec tiov[RX_MAXIOVECS];
+ afs_int32 tnio, iov, iov_offset;
+
+ temp = rx_Readv(rxcallp, tiov, &tnio, RX_MAXIOVECS, length_found);
+ osi_Log1(afsd_logp, "cm_GetBuffer rx_Readv returns %d", temp);
+ if (temp != length_found && temp < cm_data.buf_blockSize) {
+ /*
+ * If the file server returned (filesize - offset),
+ * then the first rx_Read will return zero octets of data.
+ * If it does, do not treat it as an error. Correct the
+ * length_found and continue as if the file server said
+ * it was sending us zero octets of data.
+ */
+ if (fs_fetchdata_offset_bug && first_read)
+ length_found = 0;
+ else
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
+ break;
+ }
+
+ iov = 0;
+ iov_offset = 0;
+ rbytes = temp;
+
+ while (rbytes > 0) {
+ afs_int32 len;
+
+ osi_assertx(bufferp != NULL, "null cm_buf_t");
+
+ len = MIN(tiov[iov].iov_len - iov_offset, cm_data.buf_blockSize - buffer_offset);
+ memcpy(bufferp + buffer_offset, tiov[iov].iov_base + iov_offset, len);
+ iov_offset += len;
+ buffer_offset += len;
+ rbytes -= len;
+
+ if (iov_offset == tiov[iov].iov_len) {
+ iov++;
+ iov_offset = 0;
+ }
+
+ if (buffer_offset == cm_data.buf_blockSize) {
+ /* allow read-while-fetching.
+ * if this is the last buffer, clear the
+ * PREFETCHING flag, so the reader waiting for
+ * this buffer will start a prefetch.
+ */
+ tbufp->cmFlags |= CM_BUF_CMFULLYFETCHED;
+ lock_ObtainWrite(&scp->rw);
+ if (scp->flags & CM_SCACHEFLAG_WAITING) {
+ osi_Log1(afsd_logp, "CM GetBuffer Waking scp 0x%p", scp);
+ osi_Wakeup((LONG_PTR) &scp->flags);
+ }
+ if (cpffp && !*cpffp && !osi_QPrev(&qdp->q)) {
+ osi_hyper_t tlength = ConvertLongToLargeInteger(biod.length);
+ *cpffp = 1;
+ cm_ClearPrefetchFlag(0, scp, &biod.offset, &tlength);
+ }
+ lock_ReleaseWrite(&scp->rw);
+
+ /* Advance the buffer */
+ qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
+ if (qdp) {
+ tbufp = osi_GetQData(qdp);
+ bufferp = tbufp->datap;
+ buffer_offset = 0;
+ }
+ else
+ bufferp = NULL;
+ }
+ }
+
+ length_found -= temp;
+#else /* USE_RX_IOVEC */
/* assert that there are still more buffers;
- * our check above for nbytes being less than
+ * our check above for length_found being less than
* biod.length should ensure this.
*/
- osi_assert(bufferp != NULL);
+ osi_assertx(bufferp != NULL, "null cm_buf_t");
/* read rbytes of data */
- rbytes = (nbytes > cm_data.buf_blockSize? cm_data.buf_blockSize : nbytes);
- temp = rx_Read(callp, bufferp, rbytes);
+ rbytes = (afs_uint32)(length_found > cm_data.buf_blockSize ? cm_data.buf_blockSize : length_found);
+ temp = rx_Read(rxcallp, bufferp, rbytes);
if (temp < rbytes) {
- code = (callp->error < 0) ? callp->error : -1;
+ /*
+ * If the file server returned (filesize - offset),
+ * then the first rx_Read will return zero octets of data.
+ * If it does, do not treat it as an error. Correct the
+ * length_found and continue as if the file server said
+ * it was sending us zero octets of data.
+ */
+ if (fs_fetchdata_offset_bug && first_read)
+ length_found = 0;
+ else
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
break;
}
+ first_read = 0;
/* allow read-while-fetching.
* if this is the last buffer, clear the
* this buffer will start a prefetch.
*/
tbufp->cmFlags |= CM_BUF_CMFULLYFETCHED;
- lock_ObtainMutex(&scp->mx);
+ lock_ObtainWrite(&scp->rw);
if (scp->flags & CM_SCACHEFLAG_WAITING) {
- scp->flags &= ~CM_SCACHEFLAG_WAITING;
- osi_Wakeup((long) &scp->flags);
+ osi_Log1(afsd_logp, "CM GetBuffer Waking scp 0x%p", scp);
+ osi_Wakeup((LONG_PTR) &scp->flags);
}
if (cpffp && !*cpffp && !osi_QPrev(&qdp->q)) {
+ osi_hyper_t tlength = ConvertLongToLargeInteger(biod.length);
*cpffp = 1;
- cm_ClearPrefetchFlag(0, scp, &biod.offset);
+ cm_ClearPrefetchFlag(0, scp, &biod.offset, &tlength);
}
- lock_ReleaseMutex(&scp->mx);
+ lock_ReleaseWrite(&scp->rw);
/* and adjust counters */
- nbytes -= temp;
+ length_found -= temp;
/* and move to the next buffer */
- if (nbytes != 0) {
+ if (length_found != 0) {
qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
if (qdp) {
tbufp = osi_GetQData(qdp);
bufferp = tbufp->datap;
}
- else
+ else
bufferp = NULL;
- } else
+ } else
bufferp += temp;
+#endif /* USE_RX_IOVEC */
}
/* zero out remainder of last pages, in case we are
* a page. Zero the remainder of that page, and then
* all of the rest of the pages.
*/
+#ifdef USE_RX_IOVEC
+ rbytes = cm_data.buf_blockSize - buffer_offset;
+ bufferp = tbufp->datap + buffer_offset;
+#else /* USE_RX_IOVEC */
/* bytes fetched */
- rbytes = bufferp - tbufp->datap;
+ osi_assertx((bufferp - tbufp->datap) < LONG_MAX, "data >= LONG_MAX");
+ rbytes = (long) (bufferp - tbufp->datap);
+
/* bytes left to zero */
rbytes = cm_data.buf_blockSize - rbytes;
+#endif /* USE_RX_IOVEC */
while(qdp) {
if (rbytes != 0)
memset(bufferp, 0, rbytes);
qdp = (osi_queueData_t *) osi_QPrev(&qdp->q);
- if (qdp == NULL)
+ if (qdp == NULL)
break;
tbufp = osi_GetQData(qdp);
bufferp = tbufp->datap;
/* bytes to clear in this page */
rbytes = cm_data.buf_blockSize;
- }
+ }
}
- if (code == 0)
- code = EndRXAFS_FetchData(callp, &afsStatus, &callback, &volSync);
- else
- osi_Log0(afsd_logp, "CALL EndRXAFS_FetchData skipped due to error");
- code = rx_EndCall(callp, code);
- if (code == RXKADUNKNOWNKEY)
+ if (code == 0) {
+ if (call_was_64bit)
+ code = EndRXAFS_FetchData64(rxcallp, &afsStatus, &callback, &volSync);
+ else
+ code = EndRXAFS_FetchData(rxcallp, &afsStatus, &callback, &volSync);
+ } else {
+ if (call_was_64bit)
+ osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData64 skipped due to error %d", code);
+ else
+ osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData skipped due to error %d", code);
+ }
+
+ if (rxcallp)
+ code1 = rx_EndCall(rxcallp, code);
+
+ if (code1 == RXKADUNKNOWNKEY)
osi_Log0(afsd_logp, "CALL EndCall returns RXKADUNKNOWNKEY");
+
+ /* If we are avoiding a file server bug, ignore the error state */
+ if (fs_fetchdata_offset_bug && first_read && length_found == 0 && code == -451) {
+ /* Clone the current status info and clear the error state */
+ scp_locked = cm_CloneStatus(scp, userp, scp_locked, &afsStatus, &volSync);
+ if (scp_locked) {
+ lock_ReleaseWrite(&scp->rw);
+ scp_locked = 0;
+ }
+ code = 0;
+ /* Prefer the error value from FetchData over rx_EndCall */
+ } else if (code == 0 && code1 != 0)
+ code = code1;
osi_Log0(afsd_logp, "CALL FetchData DONE");
- } while (cm_Analyze(connp, up, reqp, &scp->fid, &volSync, NULL, NULL, code));
+ } while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
fetchingcompleted:
code = cm_MapRPCError(code, reqp);
- lock_ObtainMutex(&scp->mx);
+ if (!scp_locked)
+ lock_ObtainWrite(&scp->rw);
+
/* we know that no one else has changed the buffer, since we still have
* the fetching flag on the buffers, and we have the scp locked again.
* Copy in the version # into the buffer if we got code 0 back from the
qdp;
qdp = (osi_queueData_t *) osi_QNext(&qdp->q)) {
tbufp = osi_GetQData(qdp);
- tbufp->dataVersion = afsStatus.DataVersion;
+ tbufp->dataVersion = afsStatus.dataVersionHigh;
+ tbufp->dataVersion <<= 32;
+ tbufp->dataVersion |= afsStatus.DataVersion;
#ifdef DISKCACHE95
/* write buffer out to disk cache */
}
/* release scatter/gather I/O structure (buffers, locks) */
- lock_ReleaseMutex(&scp->mx);
- cm_ReleaseBIOD(&biod, 0);
- lock_ObtainMutex(&scp->mx);
+ cm_ReleaseBIOD(&biod, 0, code, 1);
+
+ if (code == 0)
+ cm_MergeStatus(NULL, scp, &afsStatus, &volSync, userp, reqp, CM_MERGEFLAG_FETCHDATA);
+
+ return code;
+}
+
+/*
+ * Similar to cm_GetBuffer but doesn't use an allocated cm_buf_t object.
+ * Instead the data is read from the file server and copied directly into
+ * a provided buffer. Called with scp locked. The scp is locked on return.
+ */
+long cm_GetData(cm_scache_t *scp, osi_hyper_t *offsetp, char *datap, int data_length,
+ cm_user_t *userp, cm_req_t *reqp)
+{
+ long code=0, code1=0;
+ afs_uint32 nbytes; /* bytes in transfer */
+ afs_uint32 nbytes_hi = 0; /* high-order 32 bits of bytes in transfer */
+ afs_uint64 length_found = 0;
+ char *bufferp = datap;
+ afs_uint32 buffer_offset = 0;
+ long rbytes; /* bytes in rx_Read call */
+ long temp;
+ AFSFetchStatus afsStatus;
+ AFSCallBack callback;
+ AFSVolSync volSync;
+ AFSFid tfid;
+ struct rx_call *rxcallp;
+ struct rx_connection *rxconnp;
+ cm_conn_t *connp;
+ int getroot;
+ afs_int32 t1,t2;
+ int require_64bit_ops = 0;
+ int call_was_64bit = 0;
+ int fs_fetchdata_offset_bug = 0;
+ int first_read = 1;
+ int scp_locked = 1;
+
+ memset(&volSync, 0, sizeof(volSync));
+
+ /* now, the buffer may or may not be filled with good data (buf_GetNewLocked
+ * drops lots of locks, and may indeed return a properly initialized
+ * buffer, although more likely it will just return a new, empty, buffer.
+ */
+
+#ifdef AFS_FREELANCE_CLIENT
+
+ // yj: if they're trying to get the /afs directory, we need to
+ // handle it differently, since it's local rather than on any
+ // server
+
+ getroot = (scp==cm_data.rootSCachep);
+ if (getroot)
+ osi_Log1(afsd_logp,"GetBuffer returns cm_data.rootSCachep=%x",cm_data.rootSCachep);
+#endif
+
+ cm_AFSFidFromFid(&tfid, &scp->fid);
+
+ if (LargeIntegerGreaterThan(LargeIntegerAdd(*offsetp,
+ ConvertLongToLargeInteger(data_length)),
+ ConvertLongToLargeInteger(LONG_MAX))) {
+ require_64bit_ops = 1;
+ }
+
+ osi_Log2(afsd_logp, "cm_GetData: fetching data scp %p DV 0x%x", scp, scp->dataVersion);
+
+#ifdef AFS_FREELANCE_CLIENT
+
+ // yj code
+ // if getroot then we don't need to make any calls
+ // just return fake data
+
+ if (cm_freelanceEnabled && getroot) {
+ // setup the fake status
+ afsStatus.InterfaceVersion = 0x1;
+ afsStatus.FileType = 0x2;
+ afsStatus.LinkCount = scp->linkCount;
+ afsStatus.Length = cm_fakeDirSize;
+ afsStatus.DataVersion = (afs_uint32)(cm_data.fakeDirVersion & 0xFFFFFFFF);
+ afsStatus.Author = 0x1;
+ afsStatus.Owner = 0x0;
+ afsStatus.CallerAccess = 0x9;
+ afsStatus.AnonymousAccess = 0x9;
+ afsStatus.UnixModeBits = 0x1ff;
+ afsStatus.ParentVnode = 0x1;
+ afsStatus.ParentUnique = 0x1;
+ afsStatus.ResidencyMask = 0;
+ afsStatus.ClientModTime = (afs_uint32)FakeFreelanceModTime;
+ afsStatus.ServerModTime = (afs_uint32)FakeFreelanceModTime;
+ afsStatus.Group = 0;
+ afsStatus.SyncCounter = 0;
+ afsStatus.dataVersionHigh = (afs_uint32)(cm_data.fakeDirVersion >> 32);
+ afsStatus.lockCount = 0;
+ afsStatus.Length_hi = 0;
+ afsStatus.errorCode = 0;
+ memset(&volSync, 0, sizeof(volSync));
+
+ // once we're done setting up the status info,
+ // we just fill the buffer pages with fakedata
+ // from cm_FakeRootDir. Extra pages are set to
+ // 0.
+
+ lock_ObtainMutex(&cm_Freelance_Lock);
+ t1 = offsetp->LowPart;
+ memset(datap, 0, data_length);
+ t2 = cm_fakeDirSize - t1;
+ if (t2 > data_length)
+ t2 = data_length;
+ if (t2 > 0)
+ memcpy(datap, cm_FakeRootDir+t1, t2);
+ lock_ReleaseMutex(&cm_Freelance_Lock);
+
+ // once we're done, we skip over the part of the
+ // code that does the ACTUAL fetching of data for
+ // real files
+
+ goto fetchingcompleted;
+ }
+
+#endif /* AFS_FREELANCE_CLIENT */
+
+ if (scp_locked) {
+ lock_ReleaseWrite(&scp->rw);
+ scp_locked = 0;
+ }
+
+ /* now make the call */
+ do {
+ code = cm_ConnFromFID(&scp->fid, userp, reqp, &connp);
+ if (code)
+ continue;
+
+ rxconnp = cm_GetRxConn(connp);
+ rxcallp = rx_NewCall(rxconnp);
+ rx_PutConnection(rxconnp);
+
+ nbytes = nbytes_hi = 0;
+
+ if (SERVERHAS64BIT(connp)) {
+ call_was_64bit = 1;
+
+ osi_Log4(afsd_logp, "CALL FetchData64 scp 0x%p, off 0x%x:%08x, size 0x%x",
+ scp, offsetp->HighPart, offsetp->LowPart, data_length);
+
+ code = StartRXAFS_FetchData64(rxcallp, &tfid, offsetp->QuadPart, data_length);
+
+ if (code == 0) {
+ temp = rx_Read32(rxcallp, &nbytes_hi);
+ if (temp == sizeof(afs_int32)) {
+ nbytes_hi = ntohl(nbytes_hi);
+ } else {
+ nbytes_hi = 0;
+ code = rxcallp->error;
+ code1 = rx_EndCall(rxcallp, code);
+ rxcallp = NULL;
+ }
+ }
+ } else {
+ call_was_64bit = 0;
+ }
+
+ if (code == RXGEN_OPCODE || !SERVERHAS64BIT(connp)) {
+ if (require_64bit_ops) {
+ osi_Log0(afsd_logp, "Skipping FetchData. Operation requires FetchData64");
+ code = CM_ERROR_TOOBIG;
+ } else {
+ if (!rxcallp) {
+ rxconnp = cm_GetRxConn(connp);
+ rxcallp = rx_NewCall(rxconnp);
+ rx_PutConnection(rxconnp);
+ }
+
+ osi_Log3(afsd_logp, "CALL FetchData scp 0x%p, off 0x%x, size 0x%x",
+ scp, offsetp->LowPart, data_length);
+
+ code = StartRXAFS_FetchData(rxcallp, &tfid, offsetp->LowPart, data_length);
+
+ SET_SERVERHASNO64BIT(connp);
+ }
+ }
+
+ if (code == 0) {
+ temp = rx_Read32(rxcallp, &nbytes);
+ if (temp == sizeof(afs_int32)) {
+ nbytes = ntohl(nbytes);
+ FillInt64(length_found, nbytes_hi, nbytes);
+ if (length_found > data_length) {
+ /*
+ * prior to 1.4.12 and 1.5.65 the file server would return
+ * (filesize - offset) if the requested offset was greater than
+ * the filesize. The correct return value would have been zero.
+ * Force a retry by returning an RX_PROTOCOL_ERROR. If the cause
+ * is a race between two RPCs issues by this cache manager, the
+ * correct thing will happen the second time.
+ */
+ osi_Log0(afsd_logp, "cm_GetData length_found > data_length");
+ fs_fetchdata_offset_bug = 1;
+ }
+ } else {
+ osi_Log1(afsd_logp, "cm_GetData rx_Read32 returns %d != 4", temp);
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
+ }
+ }
+ /* for the moment, nbytes_hi will always be 0 if code == 0
+ because data_length is a 32-bit quantity. */
+
+ if (code == 0) {
+ /* fill length_found of data from the pipe into the pages.
+ * When we stop, qdp will point at the last page we're
+ * dealing with, and bufferp will tell us where we
+ * stopped. We'll need this info below when we clear
+ * the remainder of the last page out (and potentially
+ * clear later pages out, if we fetch past EOF).
+ */
+ while (length_found > 0) {
+#ifdef USE_RX_IOVEC
+ struct iovec tiov[RX_MAXIOVECS];
+ afs_int32 tnio, iov, iov_offset;
+
+ temp = rx_Readv(rxcallp, tiov, &tnio, RX_MAXIOVECS, length_found);
+ osi_Log1(afsd_logp, "cm_GetData rx_Readv returns %d", temp);
+ if (temp != length_found && temp < data_length) {
+ /*
+ * If the file server returned (filesize - offset),
+ * then the first rx_Read will return zero octets of data.
+ * If it does, do not treat it as an error. Correct the
+ * length_found and continue as if the file server said
+ * it was sending us zero octets of data.
+ */
+ if (fs_fetchdata_offset_bug && first_read)
+ length_found = 0;
+ else
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
+ break;
+ }
+
+ iov = 0;
+ iov_offset = 0;
+ rbytes = temp;
+
+ while (rbytes > 0) {
+ afs_int32 len;
+
+ osi_assertx(bufferp != NULL, "null cm_buf_t");
+
+ len = MIN(tiov[iov].iov_len - iov_offset, data_length - buffer_offset);
+ memcpy(bufferp + buffer_offset, tiov[iov].iov_base + iov_offset, len);
+ iov_offset += len;
+ buffer_offset += len;
+ rbytes -= len;
+
+ if (iov_offset == tiov[iov].iov_len) {
+ iov++;
+ iov_offset = 0;
+ }
+ }
+
+ length_found -= temp;
+#else /* USE_RX_IOVEC */
+ /* assert that there are still more buffers;
+ * our check above for length_found being less than
+ * data_length should ensure this.
+ */
+ osi_assertx(bufferp != NULL, "null cm_buf_t");
+
+ /* read rbytes of data */
+ rbytes = (afs_uint32)(length_found > data_length ? data_length : length_found);
+ temp = rx_Read(rxcallp, bufferp, rbytes);
+ if (temp < rbytes) {
+ /*
+ * If the file server returned (filesize - offset),
+ * then the first rx_Read will return zero octets of data.
+ * If it does, do not treat it as an error. Correct the
+ * length_found and continue as if the file server said
+ * it was sending us zero octets of data.
+ */
+ if (fs_fetchdata_offset_bug && first_read)
+ length_found = 0;
+ else
+ code = (rxcallp->error < 0) ? rxcallp->error : RX_PROTOCOL_ERROR;
+ break;
+ }
+ first_read = 0;
+
+ /* and adjust counters */
+ length_found -= temp;
+#endif /* USE_RX_IOVEC */
+ }
+
+ /* zero out remainder of last pages, in case we are
+ * fetching past EOF. We were fetching an integral #
+ * of pages, but stopped, potentially in the middle of
+ * a page. Zero the remainder of that page, and then
+ * all of the rest of the pages.
+ */
+#ifdef USE_RX_IOVEC
+ rbytes = data_length - buffer_offset;
+ bufferp = datap + buffer_offset;
+#else /* USE_RX_IOVEC */
+ /* bytes fetched */
+ osi_assertx((bufferp - datap) < LONG_MAX, "data >= LONG_MAX");
+ rbytes = (long) (bufferp - datap);
+
+ /* bytes left to zero */
+ rbytes = data_length - rbytes;
+#endif /* USE_RX_IOVEC */
+ if (rbytes != 0)
+ memset(bufferp, 0, rbytes);
+ }
+
+ if (code == 0) {
+ if (call_was_64bit)
+ code = EndRXAFS_FetchData64(rxcallp, &afsStatus, &callback, &volSync);
+ else
+ code = EndRXAFS_FetchData(rxcallp, &afsStatus, &callback, &volSync);
+ } else {
+ if (call_was_64bit)
+ osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData64 skipped due to error %d", code);
+ else
+ osi_Log1(afsd_logp, "CALL EndRXAFS_FetchData skipped due to error %d", code);
+ }
+
+ if (rxcallp)
+ code1 = rx_EndCall(rxcallp, code);
+
+ if (code1 == RXKADUNKNOWNKEY)
+ osi_Log0(afsd_logp, "CALL EndCall returns RXKADUNKNOWNKEY");
+
+ /* If we are avoiding a file server bug, ignore the error state */
+ if (fs_fetchdata_offset_bug && first_read && length_found == 0 && code == -451) {
+ /* Clone the current status info and clear the error state */
+ scp_locked = cm_CloneStatus(scp, userp, scp_locked, &afsStatus, &volSync);
+ if (scp_locked) {
+ lock_ReleaseWrite(&scp->rw);
+ scp_locked = 0;
+ }
+ code = 0;
+ /* Prefer the error value from FetchData over rx_EndCall */
+ } else if (code == 0 && code1 != 0)
+ code = code1;
+ osi_Log0(afsd_logp, "CALL FetchData DONE");
+
+ } while (cm_Analyze(connp, userp, reqp, &scp->fid, &volSync, NULL, NULL, code));
+
+ fetchingcompleted:
+ code = cm_MapRPCError(code, reqp);
+
+ if (!scp_locked)
+ lock_ObtainWrite(&scp->rw);
+
+ if (code == 0)
+ cm_MergeStatus(NULL, scp, &afsStatus, &volSync, userp, reqp, CM_MERGEFLAG_FETCHDATA);
- if (code == 0)
- cm_MergeStatus(scp, &afsStatus, &volSync, up, 0);
return code;
}
git://git.openafs.org / openafs.git / blobdiff