From: Josef Bacik <jbacik@fusionio.com>
Date: Fri, 14 Sep 2012 15:22:38 +0000 (-0400)
Subject: Btrfs: fix race with freeze and free space inodes
X-Git-Tag: v3.7-rc1~71^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98114659e0d467e2c0ee6f24f2429329328fc312;p=pandora-kernel.git

Btrfs: fix race with freeze and free space inodes

So we start our freeze, somebody comes in and does an fsync() on a file
where we have to commit a transaction for whatever reason, and we will
deadlock because the freeze is waiting on FS_FREEZE people to stop writing
to the file system, but the transaction is waiting for its free space inodes
to be written out, which are in turn waiting on sb_start_intwrite while
trying to write the file extents.  To fix this we'll just skip the
sb_start_intwrite() if we TRANS_JOIN_NOLOCK since we're being waited on by a
transaction commit so we're safe wrt to freeze and this will keep us from
deadlocking.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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