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%3Ba=su...

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