libglusterfs: use rwlock for fdtable

To resolve a fd from client requests, need to take a mutex lock for the
fdtable to do the lookup. When a client is busy doing read and write,
the mutex lock could introduce contention. Therefore, use rwlock instead
of mutex to reduce the contention.

Change-Id: Ic833aed738a178a7ea1abafed7eb13814989d28c
BUG: 1518582
Signed-off-by: Zhang Huan <zhanghuan@open-fs.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libglusterfs/src/fd.h b/libglusterfs/src/fd.h
index 31f494a7e8f..3b4acf762ae 100644
--- a/libglusterfs/src/fd.h
+++ b/libglusterfs/src/fd.h
@@ -65,7 +65,7 @@ typedef struct fd_table_entry fdentry_t;
 struct _fdtable {
         int             refcount;
         uint32_t        max_fds;
-        pthread_mutex_t lock;
+        pthread_rwlock_t lock;
         fdentry_t       *fdentries;
         int             first_free;
 };