btrfs: fix get set label blocking against balance
authorAnand Jain <Anand.Jain@oracle.com>
Fri, 19 Jul 2013 09:39:32 +0000 (17:39 +0800)
committerChris Mason <chris.mason@fusionio.com>
Sun, 1 Sep 2013 12:04:15 +0000 (08:04 -0400)
commita1b83ac52d23c85581b87836c346fb5cb90f6bfd
tree2c4a8512cc3c6e8f464082b3c98c20fc98fd08ba
parentd4c34f6bffe246bcf05a1471873667d678a47a54
btrfs: fix get set label blocking against balance

btrfs_ioctl_get_fslabel() and btrfs_ioctl_set_fslabel()
used root->fs_info->volume_mutex mutex which caused operations
like balance to block set/get label operation until its
completion and generally balance operation takes a long
time to complete, so it will be annoying to the user when
cli appears hung

also this patch will add a bit of optimization within
the btrfs_ioctl_get_falabel() function.

v1->v2:
   use fs_info->super_lock instead of uuid_mutex

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
fs/btrfs/ioctl.c