On 08/27/2013 05:06 PM, Josh Durgin wrote: > 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> I must have suggested it in e-mail... I guess I should have updated the bug. This looks good. Reviewed-by: Alex Elder <elder@xxxxxxxxxx> > Signed-off-by: Josh Durgin <josh.durgin@xxxxxxxxxxx> > --- > drivers/block/rbd.c | 10 +++++----- > 1 files changed, 5 insertions(+), 5 deletions(-) > > diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c > index f8fd7d3..80f787b 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 > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
