btrfs: unlock i_mutex after attempting to delete subvolume during send

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.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Cc: stable@vger.kernel.org
Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ca5d968f4c37..cdcd98ceddea 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2410,7 +2410,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
                         "Attempt to delete subvolume %llu during send",
                         dest->root_key.objectid);
                 err = -EPERM;
-                goto out_dput;
+                goto out_unlock_inode;
         }
 
         d_invalidate(dentry);
@@ -2505,6 +2505,7 @@ out_up_write:
                                 root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
                 spin_unlock(&dest->root_item_lock);
         }
+out_unlock_inode:
         mutex_unlock(&inode->i_mutex);
         if (!err) {
                 shrink_dcache_sb(root->fs_info->sb);