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Windows: wait for I/O on buffers to complete in cm_SetupStoreBIOD

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cm_SetupStoreBIOD constructs a list of dirty buffers for a file
that are to be written to the file server.  When constructing
the list, if when determining the first dirty buffer we come across
a buffer that is already actively involved in an I/O operation,
call buf_WaitIO() to wait until the buffer is no longer busy before
continuing.  This reduces lock contention and synchronization
conflicts.

LICENSE MIT

Change-Id: Icd79b9578b7411b138f14257bcb885249960eab0
Reviewed-on: http://gerrit.openafs.org/1760
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
This commit is contained in:
Jeffrey Altman 2010-04-16 00:09:25 -04:00 committed by Jeffrey Altman
parent 349f533351
commit 5a253b1911
1 changed files with 8 additions and 1 deletions
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9
src/WINNT/afsd/cm_dcache.c
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@ -936,8 +936,15 @@ long cm_SetupStoreBIOD(cm_scache_t *scp, osi_hyper_t *inOffsetp, long inSize,
/* get buffer mutex and scp mutex safely */
lock_ReleaseWrite(&scp->rw);
lock_ObtainMutex(&bufp->mx);
lock_ObtainWrite(&scp->rw);
/*
* 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) {