btrfs: free qgroup reserve when ORDERED_IOERR is set
authorBoris Burkov <boris@bur.io>
Fri, 1 Dec 2023 21:00:09 +0000 (13:00 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 20 Dec 2023 16:02:03 +0000 (17:02 +0100)
commit14570dfa170ede01eacedc60f717df121d8b9bbd
treeb40e06fb268e48e5b7ff51c0c7ddd08070202141
parent37b561d55936d0fcebd199d22180e595bb72b784
btrfs: free qgroup reserve when ORDERED_IOERR is set

commit f63e1164b90b385cd832ff0fdfcfa76c3cc15436 upstream.

An ordered extent completing is a critical moment in qgroup reserve
handling, as the ownership of the reservation is handed off from the
ordered extent to the delayed ref. In the happy path we release (unlock)
but do not free (decrement counter) the reservation, and the delayed ref
drives the free. However, on an error, we don't create a delayed ref,
since there is no ref to add. Therefore, free on the error path.

CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/btrfs/ordered-data.c