From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Thu, 22 Apr 2010 19:35:57 +0000 (-0400)
Subject: NFS: Fix an unstable write data integrity race
X-Git-Tag: v2.6.34-rc6~6^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=71d0a6112a363e703e383ae5b12c492485c39701;p=pandora-kernel.git

NFS: Fix an unstable write data integrity race

Commit 2c61be0a9478258f77b66208a0c4b1f5f8161c3c (NFS: Ensure that the WRITE
and COMMIT RPC calls are always uninterruptible) exposed a race on file
close. In order to ensure correct close-to-open behaviour, we want to wait
for all outstanding background commit operations to complete.

This patch adds an inode flag that indicates if a commit operation is under
way, and provides a mechanism to allow ->write_inode() to wait for its
completion if this is a data integrity flush.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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