linux-kernel - [PATCH 3.16.y-ckt 127/185] rbd: use GFP_NOIO in rbd_obj_request

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Message-Id: <1436951580-15977-128-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 15 Jul 2015 10:12:02 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ilya Dryomov <idryomov@...il.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 127/185] rbd: use GFP_NOIO in rbd_obj_request_create()

3.16.7-ckt15 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilya Dryomov <idryomov@...il.com>

commit 5a60e87603c4c533492c515b7f62578189b03c9c upstream.

rbd_obj_request_create() is called on the main I/O path, so we need to
use GFP_NOIO to make sure allocation doesn't blow back on us.  Not all
callers need this, but I'm still hardcoding the flag inside rather than
making it a parameter because a) this is going to stable, and b) those
callers shouldn't really use rbd_obj_request_create() and will be fixed
in the future.

More memory allocation fixes will follow.

Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Alex Elder <elder@...aro.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/block/rbd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index f017d1964eb6..b3fdc1b7ea76 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1909,11 +1909,11 @@ static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
 	rbd_assert(obj_request_type_valid(type));
 
 	size = strlen(object_name) + 1;
-	name = kmalloc(size, GFP_KERNEL);
+	name = kmalloc(size, GFP_NOIO);
 	if (!name)
 		return NULL;
 
-	obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL);
+	obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO);
 	if (!obj_request) {
 		kfree(name);
 		return NULL;
--
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