From: Jinshan Xiong <jinshan.xiong@intel.com>
Date: Sun, 27 Apr 2014 17:06:50 +0000 (-0400)
Subject: staging/lustre/llite: access layout version under a lock
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~36^2~1139
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09aed8a59cb659f6cbdf5b1f5c3174e7e3d306aa;p=pandora-kernel.git

staging/lustre/llite: access layout version under a lock

We used to access layout version under the protection of ldlm
lock, this introduces extra overhead for dlm lock matching.

In this patch, lli_layout_lock is introduced to access the layout
version. Also, when a layout lock is losing, we should tear down
mmap of the correspoding inode to avoid stale data accessing in the
future.

This is part of technical verification of replication.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-on: http://review.whamcloud.com/8689
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3254
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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