cm_ReleaseBIOD(&biod, 0, code, 1);
if (code == 0)
- cm_MergeStatus(NULL, scp, &afsStatus, &volSync, userp, reqp, 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);
+
+ return code;
+}
long cm_ReadMountPoint(cm_scache_t *scp, cm_user_t *userp, cm_req_t *reqp)
{
long code;
- cm_buf_t *bufp = NULL;
osi_hyper_t thyper;
- int tlen;
if (scp->mountPointStringp[0])
return 0;
#endif /* AFS_FREELANCE_CLIENT */
{
/* otherwise, we have to read it in */
- lock_ReleaseWrite(&scp->rw);
-
thyper.LowPart = thyper.HighPart = 0;
- code = buf_Get(scp, &thyper, reqp, &bufp);
-
- lock_ObtainWrite(&scp->rw);
+ code = cm_GetData(scp, &thyper, scp->mountPointStringp, MOUNTPOINTLEN, userp, reqp);
if (code)
return code;
- while (1) {
- code = cm_SyncOp(scp, bufp, userp, reqp, 0,
- CM_SCACHESYNC_READ | CM_SCACHESYNC_NEEDCALLBACK);
- if (code)
- goto done;
-
- cm_SyncOpDone(scp, bufp, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_READ);
-
- if (cm_HaveBuffer(scp, bufp, 0))
- break;
+ scp->mountPointStringp[MOUNTPOINTLEN-1] = 0; /* nul terminate */
- /* otherwise load buffer */
- code = cm_GetBuffer(scp, bufp, NULL, userp, reqp);
- if (code)
- goto done;
- }
- /* locked, has callback, has valid data in buffer */
- if ((tlen = scp->length.LowPart) > MOUNTPOINTLEN - 1)
+ if (scp->length.LowPart > MOUNTPOINTLEN - 1)
return CM_ERROR_TOOBIG;
- if (tlen <= 0) {
- code = CM_ERROR_INVAL;
- goto done;
- }
+ if (scp->length.LowPart == 0)
+ return CM_ERROR_INVAL;
- /* someone else did the work while we were out */
- if (scp->mountPointStringp[0]) {
- code = 0;
- goto done;
- }
-
- /* otherwise, copy out the link */
- memcpy(scp->mountPointStringp, bufp->datap, tlen);
-
- /* now make it null-terminated. Note that the original contents of a
- * link that is a mount point is "#volname." where "." is there just to
- * be turned into a null. That is, we can trash the last char of the
- * link without damaging the vol name. This is a stupid convention,
- * but that's the protocol.
- */
- scp->mountPointStringp[tlen-1] = 0;
- code = 0;
-
- done:
- if (bufp)
- buf_Release(bufp);
+ /* convert the terminating dot to a NUL */
+ scp->mountPointStringp[scp->length.LowPart - 1] = 0;
}
+
return code;
}
/* tscp is now held */
lock_ObtainWrite(&tscp->rw);
- code = cm_SyncOp(tscp, NULL, userp, reqp, 0,
- CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_NEEDCALLBACK);
- if (code) {
- lock_ReleaseWrite(&tscp->rw);
- cm_ReleaseSCache(tscp);
- goto done;
+
+ /*
+ * Do not get status if we do not already have a callback.
+ * The process of reading the mount point string will obtain status information
+ * in a single RPC. No reason to add a second round trip.
+ *
+ * If we do have a callback, use cm_SyncOp to get status in case the
+ * current cm_user_t is not the same as the one that obtained the
+ * mount point string contents.
+ */
+ if (cm_HaveCallback(tscp)) {
+ code = cm_SyncOp(tscp, NULL, userp, reqp, 0,
+ CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_NEEDCALLBACK);
+ if (code) {
+ lock_ReleaseWrite(&tscp->rw);
+ cm_ReleaseSCache(tscp);
+ goto done;
+ }
+ cm_SyncOpDone(tscp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
}
- cm_SyncOpDone(tscp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
/* tscp is now locked */
if (!(flags & CM_FLAG_NOMOUNTCHASE)
*/
long cm_HandleLink(cm_scache_t *linkScp, cm_user_t *userp, cm_req_t *reqp)
{
- long code;
- cm_buf_t *bufp;
- long temp;
+ long code = 0;
osi_hyper_t thyper;
lock_AssertWrite(&linkScp->rw);
} else
#endif /* AFS_FREELANCE_CLIENT */
{
- /* read the link data from the file server*/
- lock_ReleaseWrite(&linkScp->rw);
+ /* read the link data from the file server */
thyper.LowPart = thyper.HighPart = 0;
- code = buf_Get(linkScp, &thyper, reqp, &bufp);
- lock_ObtainWrite(&linkScp->rw);
- if (code)
+ code = cm_GetData(linkScp, &thyper, linkScp->mountPointStringp, MOUNTPOINTLEN, userp, reqp);
+ if (code)
return code;
- while (1) {
- code = cm_SyncOp(linkScp, bufp, userp, reqp, 0,
- CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_READ);
- if (code) {
- buf_Release(bufp);
- return code;
- }
- cm_SyncOpDone(linkScp, bufp, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_READ);
-
- if (cm_HaveBuffer(linkScp, bufp, 0))
- break;
- code = cm_GetBuffer(linkScp, bufp, NULL, userp, reqp);
- if (code) {
- buf_Release(bufp);
- return code;
- }
- } /* while loop to get the data */
+ linkScp->mountPointStringp[MOUNTPOINTLEN-1] = 0; /* null terminate */
- /* now if we still have no link read in,
- * copy the data from the buffer */
- if ((temp = linkScp->length.LowPart) >= MOUNTPOINTLEN) {
- buf_Release(bufp);
+ if (linkScp->length.LowPart > MOUNTPOINTLEN - 1)
return CM_ERROR_TOOBIG;
- }
-
- /* otherwise, it fits; make sure it is still null (could have
- * lost race with someone else referencing this link above),
- * and if so, copy in the data.
- */
- if (!linkScp->mountPointStringp[0]) {
- strncpy(linkScp->mountPointStringp, bufp->datap, temp);
- linkScp->mountPointStringp[temp] = 0; /* null terminate */
- }
- buf_Release(bufp);
+ if (linkScp->length.LowPart == 0)
+ return CM_ERROR_INVAL;
}
if ( !strnicmp(linkScp->mountPointStringp, "msdfs:", strlen("msdfs:")) )
linkScp->fileType = CM_SCACHETYPE_DFSLINK;
- } /* don't have sym link contents cached */
+ } /* don't have symlink contents cached */
- return 0;
+ return code;
}
/* called with a held vnode and a path suffix, with the held vnode being a
*newSpaceBufferp = NULL;
lock_ObtainWrite(&linkScp->rw);
+ /*
+ * Do not get status if we do not already have a callback.
+ * The process of reading the symlink string will obtain status information
+ * in a single RPC. No reason to add a second round trip.
+ *
+ * If we do have a callback, use cm_SyncOp to get status in case the
+ * current cm_user_t is not the same as the one that obtained the
+ * symlink string contents.
+ */
+ if (cm_HaveCallback(linkScp)) {
+ code = cm_SyncOp(linkScp, NULL, userp, reqp, 0,
+ CM_SCACHESYNC_GETSTATUS | CM_SCACHESYNC_NEEDCALLBACK);
+ if (code) {
+ lock_ReleaseWrite(&linkScp->rw);
+ cm_ReleaseSCache(linkScp);
+ goto done;
+ }
+ cm_SyncOpDone(linkScp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_GETSTATUS);
+ }
code = cm_HandleLink(linkScp, userp, reqp);
if (code)
goto done;
git://git.openafs.org / openafs.git / commitdiff