libceph: follow redirect replies from osds

Follow redirect replies from osds, for details see ceph.git commit
fbbe3ad1220799b7bb00ea30fce581c5eadaf034.

v1 (current) version of redirect reply consists of oloc and oid, which
expands to pool, key, nspace, hash and oid.  However, server-side code
that would populate anything other than pool doesn't exist yet, and
hence this commit adds support for pool redirects only.  To make sure
that future server-side updates don't break us, we decode all fields
and, if any of key, nspace, hash or oid have a non-default value, error
out with "corrupt osd_op_reply ..." message.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index 3170ca6d98b2..fd47e872ebcc 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -155,6 +155,8 @@ struct ceph_osd_request {
 
         struct ceph_object_locator r_base_oloc;
         struct ceph_object_id r_base_oid;
+        struct ceph_object_locator r_target_oloc;
+        struct ceph_object_id r_target_oid;
 
         u64               r_snapid;
         unsigned long     r_stamp;            /* send OR check time */
@@ -162,6 +164,10 @@ struct ceph_osd_request {
         struct ceph_snap_context *r_snapc;    /* snap context for writes */
 };
 
+struct ceph_request_redirect {
+        struct ceph_object_locator oloc;
+};
+
 struct ceph_osd_event {
         u64 cookie;
         int one_shot;