xfs: snapshot old AGFL before rewriting it

LOLLM complains that we can't undo an attempt at fixing the AGFL if
anything goes wrong during the rewrite, so take a snapshot of the whole
buffer so that we can restore it.  Move the xrep_agfl_update_agf call so
that we only update the AGF if the AGFL update is 100% successful.

While we're at it, fix leaking the used_extents bitmap if the disunion
operation fails.

Cc: stable@vger.kernel.org # v4.19
Fixes: 0e93d3f43ec7d3 ("xfs: repair the AGFL")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Assisted-by: LOLLM # finding obvious bugs
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

0 files changed, 0 insertions, 0 deletions