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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client

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Pull Ceph fix from Sage Weil:
 "This fixes a corner case for cloned RBD images"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  rbd: handle parent_overlap on writes correctly
This commit is contained in:
Linus Torvalds 2014-06-25 10:34:17 -07:00
commit 15e52d9a81
1 changed files with 9 additions and 1 deletions
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10
drivers/block/rbd.c
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@ -1431,6 +1431,14 @@ static bool obj_request_exists_test(struct rbd_obj_request *obj_request)
return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0;
}
static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request)
{
struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev;
return obj_request->img_offset <
round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header));
}
static void rbd_obj_request_get(struct rbd_obj_request *obj_request)
{
dout("%s: obj %p (was %d)\n", __func__, obj_request,
@ -2748,7 +2756,7 @@ static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)
*/
if (!img_request_write_test(img_request) ||
!img_request_layered_test(img_request) ||
rbd_dev->parent_overlap <= obj_request->img_offset ||
!obj_request_overlaps_parent(obj_request) ||
((known = obj_request_known_test(obj_request)) &&
obj_request_exists_test(obj_request))) {