From: Arne Jansen <sensille@gmx.net>
Date: Tue, 13 Sep 2011 08:55:48 +0000 (+0200)
Subject: Btrfs: add nested locking mode for paths
X-Git-Tag: v3.3-rc1~26^2~10^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b25f70f4200766355cdabda604e131d2fb6010d;p=pandora-kernel.git

Btrfs: add nested locking mode for paths

This patch adds the possibilty to read-lock an extent even if it is already
write-locked from the same thread. btrfs_find_all_roots() needs this
capability.

Signed-off-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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