dm: add presuspend_undo hook to target_type
The DM thin-pool target now must undo the changes performed during
pool_presuspend() so introduce presuspend_undo hook in target_type.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f8cdd97..f84de32 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2756,7 +2756,10 @@
if (noflush)
set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
- /* This does not get reverted if there's an error later. */
+ /*
+ * This gets reverted if there's an error later and the targets
+ * provide the .presuspend_undo hook.
+ */
dm_table_presuspend_targets(map);
/*
@@ -2767,8 +2770,10 @@
*/
if (!noflush && do_lockfs) {
r = lock_fs(md);
- if (r)
+ if (r) {
+ dm_table_presuspend_undo_targets(map);
goto out_unlock;
+ }
}
/*
@@ -2816,6 +2821,7 @@
start_queue(md->queue);
unlock_fs(md);
+ dm_table_presuspend_undo_targets(map);
goto out_unlock; /* pushback list is already flushed, so skip flush */
}