1 files changed, 69 insertions, 0 deletions
diff --git a/qa/rbd/krbd_parent_overlap.t b/qa/rbd/krbd_parent_overlap.t
new file mode 100644
index 000000000..3489d83db
--- /dev/null
+++ b/qa/rbd/krbd_parent_overlap.t
@@ -0,0 +1,69 @@
+
+For reads, only the object extent needs to be reverse mapped:
+
+  $ rbd create --size 5M img
+  $ DEV=$(sudo rbd map img)
+  $ xfs_io -c 'pwrite 0 5M' $DEV >/dev/null
+  $ sudo rbd unmap $DEV
+  $ rbd snap create --no-progress img@snap
+  $ rbd snap protect img@snap
+  $ rbd clone img@snap cloneimg
+  $ rbd resize --no-progress --size 12M cloneimg
+  $ DEV=$(sudo rbd map cloneimg)
+  $ hexdump $DEV
+  0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+  *
+  0500000 0000 0000 0000 0000 0000 0000 0000 0000
+  *
+  0c00000
+  $ dd if=$DEV iflag=direct bs=4M status=none | hexdump
+  0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+  *
+  0500000 0000 0000 0000 0000 0000 0000 0000 0000
+  *
+  0c00000
+  $ sudo rbd unmap $DEV
+  $ rbd rm --no-progress cloneimg
+  $ rbd snap unprotect img@snap
+  $ rbd snap rm --no-progress img@snap
+  $ rbd rm --no-progress img
+
+For writes, the entire object needs to be reverse mapped:
+
+  $ rbd create --size 2M img
+  $ DEV=$(sudo rbd map img)
+  $ xfs_io -c 'pwrite 0 1M' $DEV >/dev/null
+  $ sudo rbd unmap $DEV
+  $ rbd snap create --no-progress img@snap
+  $ rbd snap protect img@snap
+  $ rbd clone img@snap cloneimg
+  $ rbd resize --no-progress --size 8M cloneimg
+  $ DEV=$(sudo rbd map cloneimg)
+  $ xfs_io -c 'pwrite -S 0xef 3M 1M' $DEV >/dev/null
+  $ hexdump $DEV
+  0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+  *
+  0100000 0000 0000 0000 0000 0000 0000 0000 0000
+  *
+  0300000 efef efef efef efef efef efef efef efef
+  *
+  0400000 0000 0000 0000 0000 0000 0000 0000 0000
+  *
+  0800000
+  $ sudo rbd unmap $DEV
+  $ DEV=$(sudo rbd map cloneimg)
+  $ hexdump $DEV
+  0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+  *
+  0100000 0000 0000 0000 0000 0000 0000 0000 0000
+  *
+  0300000 efef efef efef efef efef efef efef efef
+  *
+  0400000 0000 0000 0000 0000 0000 0000 0000 0000
+  *
+  0800000
+  $ sudo rbd unmap $DEV
+  $ rbd rm --no-progress cloneimg
+  $ rbd snap unprotect img@snap
+  $ rbd snap rm --no-progress img@snap
+  $ rbd rm --no-progress img