From: jcl <jacques-charles.lafoucriere@cea.fr>
Date: Mon, 22 Jul 2013 16:06:33 +0000 (+0800)
Subject: staging/lustre/mdc: layout lock rpc must not take rpc_lock
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=bdf43213f9e7faf980025f44ec82b80caf453e8d;p=deliverable%2Flinux.git

staging/lustre/mdc: layout lock rpc must not take rpc_lock

When a client issue an RPC to get a layout lock, it
must not hold rpc_lock because in case of a restore
the rpc can be blocking for a long time

Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3200
Lustre-change: http://review.whamcloud.com/6115
Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/lustre/lustre/include/lustre_mdc.h b/drivers/staging/lustre/lustre/include/lustre_mdc.h
index fb1561a809b9..82d1f2f13031 100644
--- a/drivers/staging/lustre/lustre/include/lustre_mdc.h
+++ b/drivers/staging/lustre/lustre/include/lustre_mdc.h
@@ -86,7 +86,8 @@ static inline void mdc_get_rpc_lock(struct mdc_rpc_lock *lck,
 {
 	ENTRY;
 
-	if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP))
+	if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
+			   it->it_op == IT_LAYOUT))
 		return;
 
 	/* This would normally block until the existing request finishes.
@@ -123,7 +124,8 @@ static inline void mdc_get_rpc_lock(struct mdc_rpc_lock *lck,
 static inline void mdc_put_rpc_lock(struct mdc_rpc_lock *lck,
 				    struct lookup_intent *it)
 {
-	if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP))
+	if (it != NULL && (it->it_op == IT_GETATTR || it->it_op == IT_LOOKUP ||
+			   it->it_op == IT_LAYOUT))
 		goto out;
 
 	if (lck->rpcl_it == MDC_FAKE_RPCL_IT) { /* OBD_FAIL_MDC_RPCS_SEM */
diff --git a/drivers/staging/lustre/lustre/mdc/mdc_locks.c b/drivers/staging/lustre/lustre/mdc/mdc_locks.c
index bae2d67e7fa4..9532134e16c6 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_locks.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_locks.c
@@ -884,7 +884,7 @@ static int mdc_finish_intent_lock(struct obd_export *exp,
 	struct mdt_body *mdt_body;
 	struct ldlm_lock *lock;
 	int rc;
-
+	ENTRY;
 
 	LASSERT(request != NULL);
 	LASSERT(request != LP_POISON);