FAILED: patch "[PATCH] btrfs: don't clear ret in btrfs_start_dirty_block_groups" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 34d1eb0e599875064955a74712f08ff14c8e3d5f Mon Sep 17 00:00:00 2001
From: Josef Bacik <[email protected]>
Date: Wed, 16 Dec 2020 11:22:17 -0500
Subject: [PATCH] btrfs: don't clear ret in btrfs_start_dirty_block_groups

If we fail to update a block group item in the loop we'll break, however we'll do btrfs_run_delayed_refs and lose our error value in ret, and thus not clean up properly. Fix this by only running the delayed refs if there was no failure.

index 52f2198d44c9..0886e81e5540 100644
@@ -2669,7 +2669,8 @@ int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans)
 	 * Go through delayed refs for all the stuff we've just kicked off
 	 * and then loop back (just once)
 	 */
-	ret = btrfs_run_delayed_refs(trans, 0);
+	if (!ret)
+		ret = btrfs_run_delayed_refs(trans, 0);
 	if (!ret && loops == 0) {
 		loops++;
 		spin_lock(&cur_trans->dirty_bgs_lock);