linux-kernel - [PATCH 12/48] staging/lustre/mdc: layout lock rpc must not take rpc

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Date:	Tue, 23 Jul 2013 00:06:33 +0800
From:	Peng Tao <bergwolf@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org,
	jcl <jacques-charles.lafoucriere@....fr>,
	Peng Tao <tao.peng@....com>,
	Andreas Dilger <andreas.dilger@...el.com>
Subject: [PATCH 12/48] staging/lustre/mdc: layout lock rpc must not take rpc_lock

From: jcl <jacques-charles.lafoucriere@....fr>

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@....fr>
Reviewed-by: Jinshan Xiong <jinshan.xiong@...el.com>
Reviewed-by: Johann Lombardi <johann.lombardi@...el.com>
Signed-off-by: Peng Tao <tao.peng@....com>
Signed-off-by: Andreas Dilger <andreas.dilger@...el.com>
---
 drivers/staging/lustre/lustre/include/lustre_mdc.h |    6 ++++--
 drivers/staging/lustre/lustre/mdc/mdc_locks.c      |    2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/lustre/lustre/include/lustre_mdc.h b/drivers/staging/lustre/lustre/include/lustre_mdc.h
index fb1561a..82d1f2f 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 bae2d67..9532134 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);
-- 
1.7.9.5

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