md-cache.c: minor reduction of work under lock.

Take the time before taking the lock, not under lock.

Compile-tested only!
updates: bz#1193929
Signed-off-by: Yaniv Kaul <ykaul@redhat.com>

Change-Id: I6cd05d8556a9bcc015e1be53f6ba46854e52a380

1 files changed, 3 insertions, 4 deletions

diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c
index 186b352fba5..779e78656c0 100644
--- a/xlators/performance/md-cache/src/md-cache.c
+++ b/xlators/performance/md-cache/src/md-cache.c
@@ -1079,18 +1079,17 @@ mdc_load_statfs_info_from_cache(xlator_t *this, struct statvfs **buf)
         goto err;
     }
 
+    *buf = NULL;
+    timespec_now(&now);
+
     pthread_mutex_lock(&conf->statfs_cache.lock);
     {
-        *buf = NULL;
-
         /* Skip if the cache is not initialized */
         if (!conf->statfs_cache.initialized) {
             ret = -1;
             goto unlock;
         }
 
-        timespec_now(&now);
-
         cache_age = (now.tv_sec - conf->statfs_cache.last_refreshed.tv_sec);
 
         gf_log(this->name, GF_LOG_DEBUG, "STATFS cache age = %lf", cache_age);