Patch "btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker" has been added to the 4.15-stable tree

Patch "btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker" has been added to the 4.15-stable tree

[gregkh]

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 4.15-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-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From f3038ee3a3f1017a1cbe9907e31fa12d366c5dcb Mon Sep 17 00:00:00 2001
From: Nikolay Borisov <nborisov@suse.com>
Date: Tue, 5 Dec 2017 09:29:19 +0200
Subject: btrfs: Handle btrfs_set_extent_delalloc failure in fixup worker

From: Nikolay Borisov <nborisov@suse.com>

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.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2098,8 +2098,15 @@ again:
 		goto out;
 	 }
 
-	btrfs_set_extent_delalloc(inode, page_start, page_end, 0, &cached_state,
-				  0);
+	ret = btrfs_set_extent_delalloc(inode, page_start, page_end, 0,
+					&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);
 	btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);


Patches currently in stable-queue which might be from nborisov@suse.com are

queue-4.15/btrfs-handle-btrfs_set_extent_delalloc-failure-in-fixup-worker.patch