libceph: support for checking on status of watch

Implement ceph_osdc_watch_check() to be able to check on status of
watch.  Note that the time it takes for a watch/notify event to get
delivered through the notify_wq is taken into account.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index 63054fae4f15..2ae7cfd82ec9 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -213,6 +213,8 @@ struct ceph_osd_linger_request {
         struct ceph_osd_request *reg_req;
         struct ceph_osd_request *ping_req;
         unsigned long ping_sent;
+        unsigned long watch_valid_thru;
+        struct list_head pending_lworks;
 
         struct ceph_osd_request_target t;
         u32 last_force_resend;
@@ -417,5 +419,7 @@ int ceph_osdc_notify(struct ceph_osd_client *osdc,
                      u32 timeout,
                      struct page ***preply_pages,
                      size_t *preply_len);
+int ceph_osdc_watch_check(struct ceph_osd_client *osdc,
+                          struct ceph_osd_linger_request *lreq);
 #endif