btrfs: simplify the send_in_progress check in btrfs_delete_subvolume

Only when send_in_progress, we have to do something different such as
btrfs_warn() and return -EPERM. Therefore, we could check
send_in_progress first and process error handling, after the
root_item_lock has been got.

Just for better readability. No functional change.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3ea5339..8b3d719 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4270,18 +4270,17 @@ int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
         * again is not run concurrently.
         */
        spin_lock(&dest->root_item_lock);
-       root_flags = btrfs_root_flags(&dest->root_item);
-       if (dest->send_in_progress == 0) {
-               btrfs_set_root_flags(&dest->root_item,
-                               root_flags | BTRFS_ROOT_SUBVOL_DEAD);
-               spin_unlock(&dest->root_item_lock);
-       } else {
+       if (dest->send_in_progress) {
                spin_unlock(&dest->root_item_lock);
                btrfs_warn(fs_info,
                           "attempt to delete subvolume %llu during send",
                           dest->root_key.objectid);
                return -EPERM;
        }
+       root_flags = btrfs_root_flags(&dest->root_item);
+       btrfs_set_root_flags(&dest->root_item,
+                            root_flags | BTRFS_ROOT_SUBVOL_DEAD);
+       spin_unlock(&dest->root_item_lock);
 
        down_write(&fs_info->subvol_sem);