From: Arne Jansen <sensille@gmx.net>
Date: Wed, 6 Apr 2011 10:02:20 +0000 (+0000)
Subject: btrfs: using cached extent_state in set/unlock combinations
X-Git-Tag: v2.6.39-rc4~5^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=507903b81840a70cc6a179d4eb03584ad50e8c5b;p=pandora-kernel.git

btrfs: using cached extent_state in set/unlock combinations

In several places the sequence (set_extent_uptodate, unlock_extent) is used.
This leads to a duplicate lookup of the extent state. This patch lets
set_extent_uptodate return a cached extent_state which can be passed to
unlock_extent_cached.
The occurences of the above sequences are updated to use the cache. Only
end_bio_extent_readpage is updated that it first gets a cached state to
pass it to the readpage_end_io_hook as the prototype requested and is later
on being used for set/unlock.

Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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