dm cache: optimize commit_if_needed

Check commit_requested flag _before_ calling
dm_cache_changed_this_transaction() superfluously.

Also, be sure to set last_commit_jiffies _after_ dm_cache_commit()
completes.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 05a10c0..4b56406 100644 (file)
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1234,15 +1234,17 @@ static int need_commit_due_to_time(struct cache *cache)
 
 static int commit_if_needed(struct cache *cache)
 {
-       if (dm_cache_changed_this_transaction(cache->cmd) &&
-           (cache->commit_requested || need_commit_due_to_time(cache))) {
+       int r = 0;
+
+       if ((cache->commit_requested || need_commit_due_to_time(cache)) &&
+           dm_cache_changed_this_transaction(cache->cmd)) {
                atomic_inc(&cache->stats.commit_count);
-               cache->last_commit_jiffies = jiffies;
                cache->commit_requested = false;
-               return dm_cache_commit(cache->cmd, false);
+               r = dm_cache_commit(cache->cmd, false);
+               cache->last_commit_jiffies = jiffies;
        }
 
-       return 0;
+       return r;
 }
 
 static void process_deferred_bios(struct cache *cache)