This is a note to let you know that I've just added the patch titled
rbd: fix buffer size for writes to images with snapshots
to the 3.10-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-fix-buffer-size-for-writes-to-images-with-snapshots.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 03507db631c94a48e316c7f638ffb2991544d617 Mon Sep 17 00:00:00 2001
From: Josh Durgin <josh.durgin@xxxxxxxxxxx>
Date: Tue, 27 Aug 2013 14:45:46 -0700
Subject: rbd: fix buffer size for writes to images with snapshots
From: Josh Durgin <josh.durgin@xxxxxxxxxxx>
commit 03507db631c94a48e316c7f638ffb2991544d617 upstream.
rbd_osd_req_create() needs to know the snapshot context size to create
a buffer large enough to send it with the message front. It gets this
from the img_request, which was not set for the obj_request yet. This
resulted in trying to write past the end of the front payload, hitting
this BUG:
libceph: BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
Fix this by associating the obj_request with its img_request
immediately after it's created, before the osd request is created.
Fixes: http://tracker.ceph.com/issues/5760
Suggested-by: Alex Elder <alex.elder@xxxxxxxxxx>
Signed-off-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
Reviewed-by: Alex Elder <alex.elder@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/rbd.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2213,6 +2213,11 @@ static int rbd_img_request_fill(struct r
rbd_segment_name_free(object_name);
if (!obj_request)
goto out_unwind;
+ /*
+ * set obj_request->img_request before creating the
+ * osd_request so that it gets the right snapc
+ */
+ rbd_img_obj_request_add(img_request, obj_request);
if (type == OBJ_REQUEST_BIO) {
unsigned int clone_size;
@@ -2254,11 +2259,6 @@ static int rbd_img_request_fill(struct r
obj_request->pages, length,
offset & ~PAGE_MASK, false, false);
- /*
- * set obj_request->img_request before formatting
- * the osd_request so that it gets the right snapc
- */
- rbd_img_obj_request_add(img_request, obj_request);
if (write_request)
rbd_osd_req_format_write(obj_request);
else
Patches currently in stable-queue which might be from josh.durgin@xxxxxxxxxxx are
queue-3.10/rbd-make-rbd_obj_notify_ack-synchronous.patch
queue-3.10/libceph-add-function-to-ensure-notifies-are-complete.patch
queue-3.10/rbd-fix-buffer-size-for-writes-to-images-with-snapshots.patch
queue-3.10/rbd-fix-use-after-free-of-rbd_dev-disk.patch
queue-3.10/rbd-complete-notifies-before-cleaning-up-osd_client-and-rbd_dev.patch
queue-3.10/libceph-add-lingering-request-reference-when-registered.patch
queue-3.10/rbd-fix-null-dereference-in-dout.patch
queue-3.10/rbd-ignore-unmapped-snapshots-that-no-longer-exist.patch
queue-3.10/rbd-set-removing-flag-while-holding-list-lock.patch
queue-3.10/rbd-flush-dcache-after-zeroing-page-data.patch
queue-3.10/rbd-fix-error-handling-from-rbd_snap_name.patch
queue-3.10/rbd-protect-against-concurrent-unmaps.patch
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