tree 065ca7fbb792935029bc5c94875ead92cca81b9e
parent 81c5a1487e52a316e5e7d79e9911376648a79e85
author Yan, Zheng <zyan@redhat.com> 1513235469 +0800
committer Ilya Dryomov <idryomov@gmail.com> 1551808516 +0100

ceph: map snapid to anonymous bdev ID

ceph_getattr() return zero dev ID for head inodes and set dev ID to
snapid directly for snaphost inodes. This is not good because userspace
utilities may consider device ID of 0 as invalid, snapid may conflict
with other device's ID.

This patch introduces "snapids to anonymous bdev IDs" map. we create a
new mapping when we see a snapid for the first time. we trim unused
mapping after it is ilde for 5 minutes.

Link: http://tracker.ceph.com/issues/22353
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>