ceph: try to send partial cap release on cap message on missing inode

If we have enough memory to allocate a new cap release message, do so, so
that we can send a partial release message immediately.  This keeps us from
making the MDS wait when the cap release it needs is in a partially full
release message.

If we fail because of ENOMEM, oh well, they'll just have to wait a bit
longer.

Signed-off-by: Sage Weil <sage@newdream.net>

3 files changed, 9 insertions, 5 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 7c692e746237..619b61655ee5 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2708,6 +2708,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
                  * along for the mds (who clearly thinks we still have this
                  * cap).
                  */
+                ceph_add_cap_releases(mdsc, session, -1);
                 ceph_send_cap_releases(mdsc, session);
                 goto done;
         }
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index d28b6a9c0f96..1766947fc07a 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1066,9 +1066,9 @@ static int trim_caps(struct ceph_mds_client *mdsc,
  *
  * Called under s_mutex.
  */
-static int add_cap_releases(struct ceph_mds_client *mdsc,
-                            struct ceph_mds_session *session,
-                            int extra)
+int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
+                          struct ceph_mds_session *session,
+                          int extra)
 {
         struct ceph_msg *msg;
         struct ceph_mds_cap_release *head;
@@ -1980,7 +1980,7 @@ out_err:
         }
         mutex_unlock(&mdsc->mutex);
 
-        add_cap_releases(mdsc, req->r_session, -1);
+        ceph_add_cap_releases(mdsc, req->r_session, -1);
         mutex_unlock(&session->s_mutex);
 
         /* kick calling process */
@@ -2690,7 +2690,7 @@ static void delayed_work(struct work_struct *work)
                         send_renew_caps(mdsc, s);
                 else
                         ceph_con_keepalive(&s->s_con);
-                add_cap_releases(mdsc, s, -1);
+                ceph_add_cap_releases(mdsc, s, -1);
                 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
                     s->s_state == CEPH_MDS_SESSION_HUNG)
                         ceph_send_cap_releases(mdsc, s);
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index e43752b52635..b292fa42a66d 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -322,6 +322,9 @@ static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
         kref_put(&req->r_kref, ceph_mdsc_release_request);
 }
 
+extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
+                                 struct ceph_mds_session *session,
+                                 int extra);
 extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
                                    struct ceph_mds_session *session);