ocfs2: add DLM recovery callbacks

These are the callbacks called by the fs/dlm code in case the membership
changes.  If there is a failure while/during calling any of these, the
DLM creates a new membership and relays to the rest of the nodes.

 - recover_prep() is called when DLM understands a node is down.
 - recover_slot() is called once all nodes have acknowledged
   recover_prep and recovery can begin.
 - recover_done() is called once the recovery is complete.  It returns
   the new membership.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/fs/ocfs2/stack_user.c b/fs/ocfs2/stack_user.c
index 286edf1e231f..4111855a4def 100644
--- a/fs/ocfs2/stack_user.c
+++ b/fs/ocfs2/stack_user.c
@@ -110,6 +110,8 @@
 struct ocfs2_live_connection {
         struct list_head                oc_list;
         struct ocfs2_cluster_connection *oc_conn;
+        atomic_t                        oc_this_node;
+        int                             oc_our_slot;
 };
 
 struct ocfs2_control_private {
@@ -799,6 +801,42 @@ static int fs_protocol_compare(struct ocfs2_protocol_version *existing,
         return 0;
 }
 
+static void user_recover_prep(void *arg)
+{
+}
+
+static void user_recover_slot(void *arg, struct dlm_slot *slot)
+{
+        struct ocfs2_cluster_connection *conn = arg;
+        printk(KERN_INFO "ocfs2: Node %d/%d down. Initiating recovery.\n",
+                        slot->nodeid, slot->slot);
+        conn->cc_recovery_handler(slot->nodeid, conn->cc_recovery_data);
+
+}
+
+static void user_recover_done(void *arg, struct dlm_slot *slots,
+                int num_slots, int our_slot,
+                uint32_t generation)
+{
+        struct ocfs2_cluster_connection *conn = arg;
+        struct ocfs2_live_connection *lc = conn->cc_private;
+        int i;
+
+        for (i = 0; i < num_slots; i++)
+                if (slots[i].slot == our_slot) {
+                        atomic_set(&lc->oc_this_node, slots[i].nodeid);
+                        break;
+                }
+
+        lc->oc_our_slot = our_slot;
+}
+
+const struct dlm_lockspace_ops ocfs2_ls_ops = {
+        .recover_prep = user_recover_prep,
+        .recover_slot = user_recover_slot,
+        .recover_done = user_recover_done,
+};
+
 static int user_cluster_connect(struct ocfs2_cluster_connection *conn)
 {
         dlm_lockspace_t *fsdlm;