Btrfs: leave critical region in btrfs_find_all_roots as soon as possible

When delayed refs exist, btrfs_find_all_roots used to hold the delayed ref
mutex way longer than actually required. We ought to drop it immediately
after we're done collecting all the delayed refs.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

parent c3e06965

fs/btrfs/backref.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -839,6 +839,7 @@ again:
		}
		ret = __add_delayed_refs(head, delayed_ref_seq,
		&prefs_delayed);
		mutex_unlock(&head->mutex);
		if (ret) {
		spin_unlock(&delayed_refs->lock);
		goto out;
		@@ -932,8 +933,6 @@ again:
		}

		out:
		if (head)
		mutex_unlock(&head->mutex);
		btrfs_free_path(path);
		while (!list_empty(&prefs)) {
		ref = list_first_entry(&prefs, struct __prelim_ref, list);