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NFS: don't use FLUSH_SYNC on WB_SYNC_NONE COMMIT calls (try #2) 

WB_SYNC_NONE is supposed to mean "don't wait on anything". That should
also include not waiting for COMMIT calls to complete.

WB_SYNC_NONE is also implied when wbc->nonblocking and
wbc->for_background are set, so we can replace those checks in
nfs_commit_unstable_pages with a check for WB_SYNC_NONE.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Jeff Layton 2010-09-28 09:14:01 -04:00 committed by Trond Myklebust
parent 5c78f58e2d
commit a00dd6c03d
1 changed files with 9 additions and 7 deletions
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16
fs/nfs/write.c
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@ -1431,15 +1431,17 @@ static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_contr
int flags = FLUSH_SYNC;
int ret = 0;
/* Don't commit yet if this is a non-blocking flush and there are
* lots of outstanding writes for this mapping.
*/
if (wbc->sync_mode == WB_SYNC_NONE &&
nfsi->ncommit <= (nfsi->npages >> 1))
goto out_mark_dirty;
if (wbc->sync_mode == WB_SYNC_NONE) {
/* Don't commit yet if this is a non-blocking flush and there
* are a lot of outstanding writes for this mapping.
*/
if (nfsi->ncommit <= (nfsi->npages >> 1))
goto out_mark_dirty;
if (wbc->nonblocking || wbc->for_background)
/* don't wait for the COMMIT response */
flags = 0;
}
ret = nfs_commit_inode(inode, flags);
if (ret >= 0) {
if (wbc->sync_mode == WB_SYNC_NONE) {