ceph: connect to export targets on cap export

When we get a cap EXPORT message, make sure we are connected to all export
targets to ensure we can handle the matching IMPORT.

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

3 files changed, 23 insertions, 2 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 47068b10baf8..52befa65fbf7 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2573,7 +2573,8 @@ static void handle_cap_trunc(struct inode *inode,
  * caller holds s_mutex
  */
 static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
-                              struct ceph_mds_session *session)
+                              struct ceph_mds_session *session,
+                              int *open_target_sessions)
 {
         struct ceph_inode_info *ci = ceph_inode(inode);
         int mds = session->s_mds;
@@ -2605,6 +2606,12 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
                         ci->i_cap_exporting_mds = mds;
                         ci->i_cap_exporting_mseq = mseq;
                         ci->i_cap_exporting_issued = cap->issued;
+
+                        /*
+                         * make sure we have open sessions with all possible
+                         * export targets, so that we get the matching IMPORT
+                         */
+                        *open_target_sessions = 1;
                 }
                 __ceph_remove_cap(cap);
         }
@@ -2680,6 +2687,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
         u64 size, max_size;
         u64 tid;
         void *snaptrace;
+        int open_target_sessions = 0;
 
         dout("handle_caps from mds%d\n", mds);
 
@@ -2731,7 +2739,7 @@ void ceph_handle_caps(struct ceph_mds_session *session,
                 goto done;
 
         case CEPH_CAP_OP_EXPORT:
-                handle_cap_export(inode, h, session);
+                handle_cap_export(inode, h, session, &open_target_sessions);
                 goto done;
 
         case CEPH_CAP_OP_IMPORT:
@@ -2778,6 +2786,8 @@ done:
 done_unlocked:
         if (inode)
                 iput(inode);
+        if (open_target_sessions)
+                ceph_mdsc_open_export_target_sessions(mdsc, session);
         return;
 
 bad:
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 552b934c9cd0..a546e0ddb8e3 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -741,6 +741,14 @@ static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
         }
 }
 
+void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
+                                           struct ceph_mds_session *session)
+{
+        mutex_lock(&mdsc->mutex);
+        __open_export_target_sessions(mdsc, session);
+        mutex_unlock(&mdsc->mutex);
+}
+
 /*
  * session caps
  */
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 8f2126321f2d..c86be30e8707 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -364,4 +364,7 @@ extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
 extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
                                  struct ceph_msg *msg);
 
+extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
+                                          struct ceph_mds_session *session);
+
 #endif