[PATCH 3.14 054/228] dm cache: fix writethrough mode quiescing in cache_map

Greg Kroah-Hartman
2014-06-05T00:39:47Z

From: Mike Snitzer <snitzer@redhat.com>

commit 131cd131a9ff63d4b84f3fe15073a2984ac30066 upstream.

Commit 2ee57d58735 ("dm cache: add passthrough mode") inadvertently
removed the deferred set reference that was taken in cache_map()'s
writethrough mode support. Restore taking this reference.

This issue was found with code inspection.

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

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

--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2506,6 +2506,7 @@ static int cache_map(struct dm_target *t

} else {
inc_hit_counter(cache, bio);
+ pb->all_io_entry = dm_deferred_entry_inc(cache->all_io_ds);

if (bio_data_dir(bio) == WRITE && writethrough_mode(&cache->features) &&
!is_dirty(cache, lookup_result.cblock))