3.4-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Sage Weil <[email protected]>

This shouldn't actually be possible because the layout struct is
constructed from the RBD header and validated then.

[[email protected]: converted BUG() call to equivalent rbd_assert()]

Signed-off-by: Sage Weil <[email protected]>
Reviewed-by: Alex Elder <[email protected]>
(based on commit 6cae3717cddaf8e5e96e304733dca66e40d56f89)
---
 drivers/block/rbd.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -930,8 +930,9 @@ static int rbd_do_request(struct request
        layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
        layout->fl_pg_preferred = cpu_to_le32(-1);
        layout->fl_pg_pool = cpu_to_le32(dev->poolid);
-       ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno,
-                               req, ops);
+       ret = ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno,
+                                  req, ops);
+       BUG_ON(ret != 0);
 
        ceph_osdc_build_request(req, ofs, &len,
                                ops,


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