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 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
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-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 1e37f2f84680fa7f8394fd444b6928e334495ccc Mon Sep 17 00:00:00 2001
From: Ilya Dryomov idryomov@gmail.com Date: Mon, 6 Nov 2017 11:33:36 +0100 Subject: rbd: use GFP_NOIO for parent stat and data requests
From: Ilya Dryomov idryomov@gmail.com
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@gmail.com Reviewed-by: David Disseldorp ddiss@suse.de [idryomov@gmail.com: backport to < 4.9: context] Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/block/rbd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -2700,7 +2700,7 @@ 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; @@ -2827,7 +2827,7 @@ 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@gmail.com are
queue-3.18/rbd-use-gfp_noio-for-parent-stat-and-data-requests.patch