[dm-devel] [PATCH 1/2] dmcache: flush superblock stats when retrieving status info

[Darrick J. Wong]

When userspace queries dmcache for stats info, we should ensure that all the
metadata gets flushed out of memory to disk.  The current code neglects to
update the disk copy of the hit/miss counters.

Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
---
 drivers/md/dm-cache-target.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1074409..4fb7b4c 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2451,6 +2451,7 @@ static void cache_status(struct dm_target *ti, status_type_t type,
 	case STATUSTYPE_INFO:
 		/* Commit to ensure statistics aren't out-of-date */
 		if (!(status_flags & DM_STATUS_NOFLUSH_FLAG) && !dm_suspended(ti)) {
+			save_stats(cache);
 			r = dm_cache_commit(cache->cmd, false);
 			if (r)
 				DMERR("could not commit metadata for accurate status");