staging: lustre: mdc: don't take rpc lock for readdir case

If the operation is IT_READDIR don't need to handle the
mdc RPC lock.
Signed-off-by: wang di <di.wang@intel.com>
Reviewed-on: http://review.whamcloud.com/10761
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4906Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lustre_mdc.h

@@ -96,7 +96,7 @@ static inline void mdc_get_rpc_lock(struct mdc_rpc_lock *lck,
 				    struct lookup_intent *it)
 {
 	if (it && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
-		   it->it_op == IT_LAYOUT))
+		   it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
 		return;
 
 	/* This would normally block until the existing request finishes.
@@ -136,7 +136,7 @@ static inline void mdc_put_rpc_lock(struct mdc_rpc_lock *lck,
 				    struct lookup_intent *it)
 {
 	if (it && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
-		   it->it_op == IT_LAYOUT))
+		   it->it_op == IT_LAYOUT || it->it_op == IT_READDIR))
 		return;
 
 	if (lck->rpcl_it == MDC_FAKE_RPCL_IT) { /* OBD_FAIL_MDC_RPCS_SEM */