From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Wed, 20 Mar 2013 16:34:32 +0000 (-0400)
Subject: NFSv4.1: Fix a race in pNFS layoutcommit
X-Git-Tag: v3.9-rc5~29^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a073dbff359f4741013ae4b8395f5364c5e00b48;p=pandora-kernel.git

NFSv4.1: Fix a race in pNFS layoutcommit

We need to clear the NFS_LSEG_LAYOUTCOMMIT bits atomically with the
NFS_INO_LAYOUTCOMMIT bit, otherwise we may end up with situations
where the two are out of sync.
The first half of the problem is to ensure that pnfs_layoutcommit_inode
clears the NFS_LSEG_LAYOUTCOMMIT bit through pnfs_list_write_lseg.
We still need to keep the reference to those segments until the RPC call
is finished, so in order to make it clear _where_ those references come
from, we add a helper pnfs_list_write_lseg_done() that cleans up after
pnfs_list_write_lseg.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Benny Halevy <bhalevy@tonian.com>
Cc: stable@vger.kernel.org
---

Reading git-diff-tree failed