btrfs: error out if btrfs_attach_transaction() fails

btrfs_init_new_device() calls btrfs_attach_transaction() to
commit sys chunks, and it should error out if it fails.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Qu Wenruo <quwenruo.btrfs@gmx.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 911bee9..9f26c57 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2318,6 +2318,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
        u64 tmp;
        int seeding_dev = 0;
        int ret = 0;
+       bool unlocked = false;
 
        if (sb_rdonly(sb) && !fs_info->fs_devices->seeding)
                return -EROFS;
@@ -2477,6 +2478,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
        if (seeding_dev) {
                mutex_unlock(&uuid_mutex);
                up_write(&sb->s_umount);
+               unlocked = true;
 
                if (ret) /* transaction commit */
                        return ret;
@@ -2489,7 +2491,9 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
                if (IS_ERR(trans)) {
                        if (PTR_ERR(trans) == -ENOENT)
                                return 0;
-                       return PTR_ERR(trans);
+                       ret = PTR_ERR(trans);
+                       trans = NULL;
+                       goto error_sysfs;
                }
                ret = btrfs_commit_transaction(trans);
        }
@@ -2503,12 +2507,13 @@ error_sysfs:
 error_trans:
        if (seeding_dev)
                sb->s_flags |= MS_RDONLY;
-       btrfs_end_transaction(trans);
+       if (trans)
+               btrfs_end_transaction(trans);
        rcu_string_free(device->name);
        kfree(device);
 error:
        blkdev_put(bdev, FMODE_EXCL);
-       if (seeding_dev) {
+       if (seeding_dev && !unlocked) {
                mutex_unlock(&uuid_mutex);
                up_write(&sb->s_umount);
        }