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authorJosh Durgin <josh.durgin@inktank.com>2013-08-27 14:45:46 -0700
committerSage Weil <sage@inktank.com>2013-09-03 22:08:46 -0700
commit03507db631c94a48e316c7f638ffb2991544d617 (patch)
treeb2035f4289b911bb4172804b2a7b46958a749d0c /drivers/block
parent9542cf0bf9b1a3adcc2ef271edbcbdba03abf345 (diff)
downloadlinux-03507db631c94a48e316c7f638ffb2991544d617.tar.bz2
rbd: fix buffer size for writes to images with snapshots
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@linaro.org> Signed-off-by: Josh Durgin <josh.durgin@inktank.com> Reviewed-by: Alex Elder <alex.elder@linaro.org>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/rbd.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index f8fd7d3c13ba..80f787b6226e 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2203,6 +2203,11 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
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;
@@ -2244,11 +2249,6 @@ static int rbd_img_request_fill(struct rbd_img_request *img_request,
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