An rbd clone image that has an overlap with its parent of 0 is
effectively not a layered image at all. Detect this case and treat
such an image as non-layered. Issue a warning to be sure the user
knows what's going on.
This resolves:
http://tracker.ceph.com/issues/5028
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
---
drivers/block/rbd.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index b9221a0..3a8135f 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3655,9 +3655,13 @@ static int rbd_dev_v2_parent_info(struct
rbd_device *rbd_dev)
ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err);
ceph_decode_64_safe(&p, end, overlap, out_err);
- rbd_dev->parent_overlap = overlap;
- rbd_dev->parent_spec = parent_spec;
- parent_spec = NULL; /* rbd_dev now owns this */
+ if (overlap) {
+ rbd_dev->parent_spec = parent_spec;
+ parent_spec = NULL; /* rbd_dev now owns this */
+ rbd_dev->parent_overlap = overlap;
+ } else {
+ rbd_warn(rbd_dev, "ignoring parent of clone with overlap 0\n");
+ }
out:
ret = 0;
out_err:
--
1.7.9.5
--
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