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NFS: Fix a write performance regression

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commit 8fa4592a14 upstream.

If all other conditions in nfs_can_extend_write() are met, and there
are no locks, then we should be able to assume close-to-open semantics
and the ability to extend our write to cover the whole page.

With this patch, the xfstests generic/074 test completes in 242s instead
of >1400s on my test rig.

Fixes: bd61e0a9c8 ("locks: convert posix locks to file_lock_context")
Cc: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust
2015-10-01 18:38:27 -04:00
committed by Greg Kroah-Hartman
parent 0fe83960ec
commit 896f0858ce
1 changed files with 1 additions and 1 deletions
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fs/nfs/write.c
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@@ -1203,7 +1203,7 @@ static int nfs_can_extend_write(struct file *file, struct page *page, struct ino
return 1;
if (!flctx || (list_empty_careful(&flctx->flc_flock) &&
list_empty_careful(&flctx->flc_posix)))
return 0;
return 1;
/* Check to see if there are whole file write locks */
ret = 0;