From: Wu Fengguang <fengguang.wu@intel.com>
Date: Mon, 8 Aug 2011 21:19:47 +0000 (-0600)
Subject: btrfs: fix dirtied pages accounting on sub-page writes
X-Git-Tag: v3.3-rc1~112^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=32c7f202a4801252a0f3578807b75a961f792870;p=pandora-kernel.git

btrfs: fix dirtied pages accounting on sub-page writes

When doing 1KB sequential writes to the same page,
balance_dirty_pages_ratelimited_nr() should be called once instead of 4
times, the latter makes the dirtier tasks be throttled much too heavy.

Fix it with proper de-accounting on clear_page_dirty_for_io().

CC: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
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