Patch "btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
btrfs-handle-btrfs_set_extent_delalloc-failure-in-fixup-worker.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nikolay Borisov <[email protected]>
Date: Tue, 5 Dec 2017 09:29:19 +0200
Subject: btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker

From: Nikolay Borisov <[email protected]>

commit f3038ee3a3f1017a1cbe9907e31fa12d366c5dcb upstream.

This function was introduced by 247e743cbe6e ("Btrfs: Use async helpers to deal with pages that have been improperly dirtied") and it didn't do any error handling then. This function might very well fail in ENOMEM situation, yet it's not handled, this could lead to inconsistent state. So let's handle the failure by setting the mapping error bit.

---
 fs/btrfs/inode.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

@@ -2101,8 +2101,15 @@ again:
 		goto out;
 	 }
 
-	btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state,
-				  0);
+	ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
+					&cached_state, 0);
+	if (ret) {
+		mapping_set_error(page->mapping, ret);
+		end_extent_writepage(page, ret, page_start, page_end);
+		ClearPageChecked(page);
+		goto out;
+	}
+
 	ClearPageChecked(page);
 	set_page_dirty(page);
 out:

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/btrfs-handle-btrfs_set_extent_delalloc-failure-in-fixup-worker.patch