From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Fri, 27 Apr 2012 16:41:46 +0000 (-0400)
Subject: Btrfs: fix block_rsv and space_info lock ordering
X-Git-Tag: v3.4-rc5~6^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f699d38b6556c393ac80f1c23c2053502a51631;p=pandora-kernel.git

Btrfs: fix block_rsv and space_info lock ordering

may_commit_transaction() calls
        spin_lock(&space_info->lock);
        spin_lock(&delayed_rsv->lock);
and update_global_block_rsv() calls
        spin_lock(&block_rsv->lock);
        spin_lock(&sinfo->lock);

Lockdep complains about this at run time.
Everywhere except in update_global_block_rsv(), the space_info lock is
the outer lock, therefore the locking order in update_global_block_rsv()
is changed.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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