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dm cache: fix writethrough mode quiescing in cache_map 

Commit 2ee57d5873 ("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>
Cc: stable@vger.kernel.org # 3.13+
This commit is contained in:
Mike Snitzer 2014-05-01 16:14:24 -04:00
parent fbcde3d8b9
commit 131cd131a9
1 changed files with 1 additions and 0 deletions
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1
drivers/md/dm-cache-target.c
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@ -2488,6 +2488,7 @@ static int cache_map(struct dm_target *ti, struct bio *bio)
} 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))