From: Tejun Heo <tj@kernel.org>
Date: Sat, 15 May 2010 18:09:27 +0000 (+0200)
Subject: buffer: make invalidate_bdev() drain all percpu LRU add caches
X-Git-Tag: v2.6.35-rc1~442^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fa4b9074cd8428958c2adf9dc0c831f46e27c193;p=pandora-kernel.git

buffer: make invalidate_bdev() drain all percpu LRU add caches

invalidate_bdev() should release all page cache pages which are clean
and not being used; however, if some pages are still in the percpu LRU
add caches on other cpus, those pages are considered in used and don't
get released.  Fix it by calling lru_add_drain_all() before trying to
invalidate pages.

This problem was discovered while testing block automatic native
capacity unlocking.  Null pages which were read before automatic
unlocking didn't get released by invalidate_bdev() and ended up
interfering with partition scan after unlocking.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

Reading git-diff-tree failed