On Sat, Mar 28, 2015 at 04:02:06AM -0700, Omar Sandoval wrote:
> Whenever the check for a send in progress introduced in commit
> 521e0546c970 (btrfs: protect snapshots from deleting during send) is
> hit, we return without unlocking inode->i_mutex. This is easy to see
> with lockdep enabled:
>
> [ +0.000059] ================================================
> [ +0.000028] [ BUG: lock held when returning to user space! ]
> [ +0.000029] 4.0.0-rc5-00096-g3c435c1 #93 Not tainted
> [ +0.000026] ------------------------------------------------
> [ +0.000029] btrfs/211 is leaving the kernel with locks still held!
> [ +0.000029] 1 lock held by btrfs/211:
> [ +0.000023] #0: (&type->i_mutex_dir_key){+.+.+.}, at:
> [<ffffffff8135b8df>] btrfs_ioctl_snap_destroy+0x2df/0x7a0
>
> Make sure we unlock it in the error path.
>
> Signed-off-by: Omar Sandoval <osan...@osandov.com>
Reviewed-by: David Sterba <dste...@suse.cz>
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