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authorDavid Sterba <dsterba@suse.cz>2013-12-06 17:51:32 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-12-20 07:45:10 -0800
commit89ec75229a591cd7a3f57c330dc0791b8646b112 (patch)
tree0074b91e06f2f95ca4f1763e86a3ce8ceafd37a7
parent6b047827d4cdd57ac7c4f9da2d779d811649566f (diff)
downloadlinaro-lsk-89ec75229a591cd7a3f57c330dc0791b8646b112.tar.gz
btrfs: call mnt_drop_write after interrupted subvol deletion
commit e43f998e47bae27e37e159915625e8d4b130153b upstream. If btrfs_ioctl_snap_destroy blocks on the mutex and the process is killed, mnt_write count is unbalanced and leads to unmountable filesystem. Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Chris Mason <clm@fb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/btrfs/ioctl.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8dedf401967..145b2c75ab8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2093,7 +2093,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
if (err == -EINTR)
- goto out;
+ goto out_drop_write;
dentry = lookup_one_len(vol_args->name, parent, namelen);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
@@ -2235,6 +2235,7 @@ out_dput:
dput(dentry);
out_unlock_dir:
mutex_unlock(&dir->i_mutex);
+out_drop_write:
mnt_drop_write_file(file);
out:
kfree(vol_args);