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dm: add presuspend_undo hook to target_type

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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>
This commit is contained in:
Mike Snitzer
2014-10-28 20:13:31 -04:00
parent 4d341d8216
commit d67ee213fa
5 changed files with 42 additions and 11 deletions
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10
drivers/md/dm.c
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@@ -2756,7 +2756,10 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
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 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
*/
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 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
start_queue(md->queue);
unlock_fs(md);
dm_table_presuspend_undo_targets(map);
goto out_unlock; /* pushback list is already flushed, so skip flush */
}