tree df4e2531b11c7a3ea309c9ee991d43090f2be4b5
parent 8e138e0d92c6c9d3d481674fb14e3439b495be37
author Josef Bacik <jbacik@fb.com> 1510780852 -0500
committer David Sterba <dsterba@suse.com> 1511794207 +0100

btrfs: fix deadlock when writing out space cache

If we fail to prepare our pages for whatever reason (out of memory in
our case) we need to make sure to drop the block_group->data_rwsem,
otherwise hilarity ensues.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add label and use existing unlocking code ]
Signed-off-by: David Sterba <dsterba@suse.com>