afs_uint32
raw_WriteData( cm_scache_t *scp, osi_hyper_t *offsetp, afs_uint32 length, char *bufferp,
cm_user_t *userp, cm_req_t *reqp, afs_uint32 *writtenp)
{
long code = 0;
long written = 0;
osi_hyper_t fileLength; /* file's length at start of write */
osi_hyper_t minLength; /* don't read past this */
afs_uint32 nbytes; /* # of bytes to transfer this iteration */
cm_buf_t *bufp = NULL;
osi_hyper_t thyper; /* hyper tmp variable */
osi_hyper_t bufferOffset;
afs_uint32 bufIndex; /* index in buffer where our data is */
int doWriteBack = 0;
osi_hyper_t writeBackOffset;/* offset of region to write back when I/O is done */
afs_uint32 writeBackLength;
DWORD filter = 0;
/* start by looking up the file's end */
code = cm_SyncOp(scp, NULL, userp, reqp, 0,
CM_SCACHESYNC_NEEDCALLBACK
| CM_SCACHESYNC_SETSTATUS
| CM_SCACHESYNC_GETSTATUS);
if (code)
goto done;
cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_SETSTATUS | CM_SCACHESYNC_GETSTATUS);
/* now we have the entry locked, look up the length */
fileLength = scp->length;
minLength = fileLength;
if (LargeIntegerGreaterThan(minLength, scp->serverLength))
minLength = scp->serverLength;
/* adjust file length if we extend past EOF */
thyper.LowPart = length;
thyper.HighPart = 0;
thyper = LargeIntegerAdd(*offsetp, thyper); /* where write should end */
if (LargeIntegerGreaterThan(thyper, fileLength)) {
/* we'd write past EOF, so extend the file */
scp->mask |= CM_SCACHEMASK_LENGTH;
scp->length = thyper;
filter |= (FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_SIZE);
} else
filter |= FILE_NOTIFY_CHANGE_LAST_WRITE;
doWriteBack = 1;
writeBackOffset = *offsetp;
writeBackLength = length;
/* now, copy the data one buffer at a time, until we've filled the
* request packet */
while (1) {
/* if we've copied all the data requested, we're done */
if (length <= 0) break;
/* otherwise, load up a buffer of data */
thyper.HighPart = offsetp->HighPart;
thyper.LowPart = offsetp->LowPart & ~(cm_data.blockSize-1);
if (!bufp || !LargeIntegerEqualTo(thyper, bufferOffset)) {
/* wrong buffer */
if (bufp) {
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
bufp = NULL;
}
lock_ReleaseWrite(&scp->rw);
code = buf_Get(scp, &thyper, reqp, 0, &bufp);
if (bufp)
lock_ObtainMutex(&bufp->mx);
lock_ObtainWrite(&scp->rw);
if (code)
goto done;
bufferOffset = thyper;
/* now get the data in the cache */
while (1) {
code = cm_SyncOp(scp, bufp, userp, reqp, 0,
CM_SCACHESYNC_NEEDCALLBACK
| CM_SCACHESYNC_WRITE
| CM_SCACHESYNC_BUFLOCKED);
if (code)
goto done;
cm_SyncOpDone(scp, bufp,
CM_SCACHESYNC_NEEDCALLBACK
| CM_SCACHESYNC_WRITE
| CM_SCACHESYNC_BUFLOCKED);
/* If we're overwriting the entire buffer, or
* if we're writing at or past EOF, mark the
* buffer as current so we don't call
* cm_GetBuffer. This skips the fetch from the
* server in those cases where we're going to
* obliterate all the data in the buffer anyway,
* or in those cases where there is no useful
* data at the server to start with.
*
* Use minLength instead of scp->length, since
* the latter has already been updated by this
* call.
*/
if (LargeIntegerGreaterThanOrEqualTo(bufp->offset, minLength) ||
LargeIntegerEqualTo(*offsetp, bufp->offset) &&
(length >= cm_data.blockSize ||
LargeIntegerGreaterThanOrEqualTo(LargeIntegerAdd(*offsetp, ConvertLongToLargeInteger(length)), minLength))) {
if (length < cm_data.blockSize
&& bufp->dataVersion == CM_BUF_VERSION_BAD)
memset(bufp->datap, 0,
cm_data.blockSize);
bufp->dataVersion = scp->dataVersion;
}
if (cm_HaveBuffer(scp, bufp, 1)) break;
/* otherwise, load the buffer and try again */
lock_ReleaseMutex(&bufp->mx);
code = cm_GetBuffer(scp, bufp, NULL, userp, reqp);
lock_ReleaseWrite(&scp->rw);
lock_ObtainMutex(&bufp->mx);
lock_ObtainWrite(&scp->rw);
if (code)
break;
}
if (code) {
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
bufp = NULL;
goto done;
}
} /* if (wrong buffer) ... */
/* now we have the right buffer loaded. Copy out the
* data from here to the user's buffer.
*/
bufIndex = offsetp->LowPart & (cm_data.blockSize - 1);
/* and figure out how many bytes we want from this buffer */
nbytes = cm_data.blockSize - bufIndex; /* what remains in buffer */
if (nbytes > length)
nbytes = length; /* don't go past end of request */
/* now copy the data */
memcpy(bufp->datap + bufIndex, bufferp, nbytes);
buf_SetDirty(bufp, reqp, bufIndex, nbytes, userp);
/* adjust lengthers, pointers, etc. */
bufferp += nbytes;
length -= nbytes;
written += nbytes;
thyper.LowPart = nbytes;
thyper.HighPart = 0;
*offsetp = LargeIntegerAdd(thyper, *offsetp);
} /* while 1 */
done:
if (writtenp)
*writtenp = written;
if (bufp) {
lock_ReleaseMutex(&bufp->mx);
buf_Release(bufp);
}
if (code == 0 && doWriteBack) {
rock_BkgStore_t *rockp = malloc(sizeof(*rockp));
if (rockp) {
code = cm_SyncOp(scp, NULL, userp, reqp, 0, CM_SCACHESYNC_ASYNCSTORE);
if (code == 0) {
rockp->length = writeBackLength;
rockp->offset = writeBackOffset;
lock_ReleaseWrite(&scp->rw);
cm_QueueBKGRequest(scp, cm_BkgStore, rockp, userp, reqp);
lock_ObtainWrite(&scp->rw);
/* rock is freed by cm_BkgDaemon */
} else {
free(rockp);
}
}
}
/* cm_SyncOpDone is called when cm_BkgStore completes */
return code;
}
long WriteData(cm_scache_t *scp, osi_hyper_t offset, long count, char *op,
cm_user_t *userp, long *writtenp)
{
long code = 0;
long written = 0;
osi_hyper_t fileLength; /* file's length at start of write */
osi_hyper_t minLength; /* don't read past this */
afs_uint32 nbytes; /* # of bytes to transfer this iteration */
cm_buf_t *bufferp;
osi_hyper_t thyper; /* hyper tmp variable */
osi_hyper_t bufferOffset;
afs_uint32 bufIndex; /* index in buffer where our data is */
int doWriteBack;
osi_hyper_t writeBackOffset;/* offset of region to write back when
* I/O is done */
DWORD filter = 0;
cm_req_t req;
cm_InitReq(&req);
bufferp = NULL;
doWriteBack = 0;
lock_ObtainWrite(&scp->rw);
/* start by looking up the file's end */
code = cm_SyncOp(scp, NULL, userp, &req, 0,
CM_SCACHESYNC_NEEDCALLBACK
| CM_SCACHESYNC_SETSTATUS
| CM_SCACHESYNC_GETSTATUS);
if (code)
goto done;
cm_SyncOpDone(scp, NULL, CM_SCACHESYNC_NEEDCALLBACK | CM_SCACHESYNC_SETSTATUS | CM_SCACHESYNC_GETSTATUS);
#if 0
/* make sure we have a writable FD */
if (!(fidp->flags & SMB_FID_OPENWRITE)) {
code = CM_ERROR_BADFDOP;
goto done;
}
#endif
/* now we have the entry locked, look up the length */
fileLength = scp->length;
minLength = fileLength;
if (LargeIntegerGreaterThan(minLength, scp->serverLength))
minLength = scp->serverLength;
/* adjust file length if we extend past EOF */
thyper.LowPart = count;
thyper.HighPart = 0;
thyper = LargeIntegerAdd(offset, thyper); /* where write should end */
if (LargeIntegerGreaterThan(thyper, fileLength)) {
/* we'd write past EOF, so extend the file */
scp->mask |= CM_SCACHEMASK_LENGTH;
scp->length = thyper;
filter |= (FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_SIZE);
} else
filter |= FILE_NOTIFY_CHANGE_LAST_WRITE;
/* now, if the new position (thyper) and the old (offset) are in
* different storeback windows, remember to store back the previous
* storeback window when we're done with the write.
*/
if ((thyper.LowPart & (-cm_chunkSize)) !=
(offset.LowPart & (-cm_chunkSize))) {
/* they're different */
doWriteBack = 1;
writeBackOffset.HighPart = offset.HighPart;
writeBackOffset.LowPart = offset.LowPart & (-cm_chunkSize);
}
*writtenp = count;
/* now, copy the data one buffer at a time, until we've filled the
* request packet */
while (1) {
/* if we've copied all the data requested, we're done */
if (count <= 0) break;
/* handle over quota or out of space */
if (scp->flags & (CM_SCACHEFLAG_OVERQUOTA | CM_SCACHEFLAG_OUTOFSPACE)) {
*writtenp = written;
break;
}
/* otherwise, load up a buffer of data */
thyper.HighPart = offset.HighPart;
thyper.LowPart = offset.LowPart & ~(buf_bufferSize-1);
if (!bufferp || !LargeIntegerEqualTo(thyper, bufferOffset)) {
/* wrong buffer */
if (bufferp) {
lock_ReleaseMutex(&bufferp->mx);
buf_Release(bufferp);
bufferp = NULL;
}
lock_ReleaseWrite(&scp->rw);
code = buf_Get(scp, &thyper, &bufferp);
lock_ObtainMutex(&bufferp->mx);
lock_ObtainWrite(&scp->rw);
if (code)
goto done;
bufferOffset = thyper;
/* now get the data in the cache */
while (1) {
code = cm_SyncOp(scp, bufferp, userp, &req, 0,
CM_SCACHESYNC_NEEDCALLBACK
| CM_SCACHESYNC_WRITE
| CM_SCACHESYNC_BUFLOCKED);
if (code)
goto done;
cm_SyncOpDone(scp, bufferp,
CM_SCACHESYNC_NEEDCALLBACK
| CM_SCACHESYNC_WRITE
| CM_SCACHESYNC_BUFLOCKED);
/* If we're overwriting the entire buffer, or
* if we're writing at or past EOF, mark the
* buffer as current so we don't call
* cm_GetBuffer. This skips the fetch from the
* server in those cases where we're going to
* obliterate all the data in the buffer anyway,
* or in those cases where there is no useful
* data at the server to start with.
*
* Use minLength instead of scp->length, since
* the latter has already been updated by this
* call.
*/
if (LargeIntegerGreaterThanOrEqualTo(bufferp->offset, minLength) ||
LargeIntegerEqualTo(offset, bufferp->offset) &&
(count >= buf_bufferSize ||
LargeIntegerGreaterThanOrEqualTo(LargeIntegerAdd(offset, ConvertLongToLargeInteger(count)), minLength))) {
if (count < buf_bufferSize
&& bufferp->dataVersion == -1)
memset(bufferp->datap, 0,
buf_bufferSize);
bufferp->dataVersion = scp->dataVersion;
}
if (cm_HaveBuffer(scp, bufferp, 1)) break;
/* otherwise, load the buffer and try again */
lock_ReleaseMutex(&bufferp->mx);
code = cm_GetBuffer(scp, bufferp, NULL, userp,
&req);
lock_ReleaseWrite(&scp->rw);
lock_ObtainMutex(&bufferp->mx);
lock_ObtainWrite(&scp->rw);
if (code)
break;
}
if (code) {
lock_ReleaseMutex(&bufferp->mx);
buf_Release(bufferp);
bufferp = NULL;
goto done;
}
} /* if (wrong buffer) ... */
/* now we have the right buffer loaded. Copy out the
* data from here to the user's buffer.
*/
bufIndex = offset.LowPart & (buf_bufferSize - 1);
/* and figure out how many bytes we want from this buffer */
nbytes = buf_bufferSize - bufIndex; /* what remains in buffer */
if (nbytes > count)
nbytes = count; /* don't go past end of request */
/* now copy the data */
memcpy(bufferp->datap + bufIndex, op, nbytes);
buf_SetDirty(bufferp, bufIndex, nbytes, userp);
/* adjust counters, pointers, etc. */
op += nbytes;
count -= nbytes;
written += nbytes;
thyper.LowPart = nbytes;
thyper.HighPart = 0;
offset = LargeIntegerAdd(thyper, offset);
} /* while 1 */
done:
lock_ReleaseWrite(&scp->rw);
if (bufferp) {
lock_ReleaseMutex(&bufferp->mx);
buf_Release(bufferp);
}
if (code == 0 && doWriteBack) {
lock_ObtainWrite(&scp->rw);
code = cm_SyncOp(scp, NULL, userp, &req, 0, CM_SCACHESYNC_ASYNCSTORE);
lock_ReleaseWrite(&scp->rw);
if (code == 0)
cm_QueueBKGRequest(scp, cm_BkgStore, writeBackOffset.LowPart,
writeBackOffset.HighPart, cm_chunkSize, 0, userp);
}
/* cm_SyncOpDone is called when cm_BkgStore completes */
return code;
}