[PATCH 3.8 038/166] dm thin: re-establish read-only state when switching to fail mode

Kamal Mostafa
2014-01-15T21:50:52Z

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: Kamal Mostafa <kamal@canonical.com>
---
drivers/md/dm-thin.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 7ac3dd4..bc7d4a3 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -1312,6 +1312,7 @@ static void set_pool_mode(struct pool *pool, enum pool_mode mode)
switch (mode) {
case PM_FAIL:
DMERR("switching pool to failure mode");
+ 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;
--
1.8.3.2