[PATCH 3.12 091/118] dm thin: re-establish read-only state when switching to fail mode

Greg Kroah-Hartman
2013-12-18T21:24:56Z

From: Joe Thornber <ejt@redhat.com>

commit 5383ef3a929a1366e2ced45cd6d74be7aa2a2281 upstream.

If the thin-pool transitioned to fail mode and the thin-pool's table
were reloaded for some reason: the new table's default pool mode would
be read-write, though it will transition to fail mode during resume.

When the pool mode transitions directly from PM_WRITE to PM_FAIL we need
to re-establish the intermediate read-only state in both the metadata
and persistent-data block manager (as is usually done with the normal
pool mode transition sequence: PM_WRITE -> PM_READ_ONLY -> PM_FAIL).

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/dm-thin.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1400,6 +1400,7 @@ static void set_pool_mode(struct pool *p
case PM_FAIL:
DMERR("%s: switching pool to failure mode",
dm_device_name(pool->pool_md));
+ dm_pool_metadata_read_only(pool->pmd);
pool->process_bio = process_bio_fail;
pool->process_discard = process_bio_fail;
pool->process_prepared_mapping = process_prepared_mapping_fail;