From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Thu, 1 Oct 2015 22:38:27 +0000 (-0400)
Subject: NFS: Fix a write performance regression
X-Git-Tag: omap-for-v4.3/fixes-rc5~34^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8fa4592a14ebb3c22a21d846d1e4f65dab7d1a7c;p=pandora-kernel.git

NFS: Fix a write performance regression

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: bd61e0a9c852 ("locks: convert posix locks to file_lock_context")
Cc: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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