This is a note to let you know that I've just added the patch titled
rbd: use GFP_NOIO for parent stat and data requests
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rbd-use-gfp_noio-for-parent-stat-and-data-requests.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1e37f2f84680fa7f8394fd444b6928e334495ccc Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@xxxxxxxxx>
Date: Mon, 6 Nov 2017 11:33:36 +0100
Subject: rbd: use GFP_NOIO for parent stat and data requests
From: Ilya Dryomov <idryomov@xxxxxxxxx>
commit 1e37f2f84680fa7f8394fd444b6928e334495ccc upstream.
rbd_img_obj_exists_submit() and rbd_img_obj_parent_read_full() are on
the writeback path for cloned images -- we attempt a stat on the parent
object to see if it exists and potentially read it in to call copyup.
GFP_NOIO should be used instead of GFP_KERNEL here.
Link: http://tracker.ceph.com/issues/22014
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Reviewed-by: David Disseldorp <ddiss@xxxxxxx>
[idryomov@xxxxxxxxx: backport to < 4.9: context]
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/rbd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2736,7 +2736,7 @@ static int rbd_img_obj_parent_read_full(
* from the parent.
*/
page_count = (u32)calc_pages_for(0, length);
- pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
+ pages = ceph_alloc_page_vector(page_count, GFP_NOIO);
if (IS_ERR(pages)) {
result = PTR_ERR(pages);
pages = NULL;
@@ -2863,7 +2863,7 @@ static int rbd_img_obj_exists_submit(str
*/
size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32);
page_count = (u32)calc_pages_for(0, size);
- pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
+ pages = ceph_alloc_page_vector(page_count, GFP_NOIO);
if (IS_ERR(pages))
return PTR_ERR(pages);
Patches currently in stable-queue which might be from idryomov@xxxxxxxxx are
queue-4.4/rbd-use-gfp_noio-for-parent-stat-and-data-requests.patch