From: Jeff Mahoney <jeffm@suse.com>
Date: Tue, 9 Jul 2013 20:37:21 +0000 (-0400)
Subject: btrfs: fall back to global reservation when removing subvolumes
X-Git-Tag: v3.12-rc1~40^2~112
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ee3441b49092000402748f5345ee0a3d4c8ac04e;p=pandora-kernel.git

btrfs: fall back to global reservation when removing subvolumes

I recently did some ENOSPC testing that involved filling the disk
while create and removing snapshots in a loop. During the test cycle,
I ran into an ENOSPC when trying to remove a snapshot, leaving the fs
stuck in ENOSPC even after a umount/mount cycle.

This patch allow subvolume removal to fall back onto the global
block reservation in order to succeed when it would have failed
otherwise.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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