metadata_update sends message to other nodes

   - request to send a message
   - make changes to superblock
   - send messages telling everyone that the superblock has changed
   - other nodes all read the superblock
   - other nodes all ack the messages
   - updating node release the "I'm sending a message" resource.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 9a4abe1..5db4910 100644 (file)
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -621,11 +621,39 @@ static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
        dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
 }
 
+static int metadata_update_start(struct mddev *mddev)
+{
+       return lock_comm(mddev->cluster_info);
+}
+
+static int metadata_update_finish(struct mddev *mddev)
+{
+       struct md_cluster_info *cinfo = mddev->cluster_info;
+       struct cluster_msg cmsg;
+       int ret;
+
+       memset(&cmsg, 0, sizeof(cmsg));
+       cmsg.type = cpu_to_le32(METADATA_UPDATED);
+       ret = __sendmsg(cinfo, &cmsg);
+       unlock_comm(cinfo);
+       return ret;
+}
+
+static int metadata_update_cancel(struct mddev *mddev)
+{
+       struct md_cluster_info *cinfo = mddev->cluster_info;
+
+       return dlm_unlock_sync(cinfo->token_lockres);
+}
+
 static struct md_cluster_operations cluster_ops = {
        .join   = join,
        .leave  = leave,
        .slot_number = slot_number,
        .resync_info_update = resync_info_update,
+       .metadata_update_start = metadata_update_start,
+       .metadata_update_finish = metadata_update_finish,
+       .metadata_update_cancel = metadata_update_cancel,
 };
 
 static int __init cluster_init(void)

diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h
index 51a24df..658982a 100644 (file)
--- a/drivers/md/md-cluster.h
+++ b/drivers/md/md-cluster.h
@@ -12,6 +12,9 @@ struct md_cluster_operations {
        int (*leave)(struct mddev *mddev);
        int (*slot_number)(struct mddev *mddev);
        void (*resync_info_update)(struct mddev *mddev, sector_t lo, sector_t hi);
+       int (*metadata_update_start)(struct mddev *mddev);
+       int (*metadata_update_finish)(struct mddev *mddev);
+       int (*metadata_update_cancel)(struct mddev *mddev);
 };
 
 #endif /* _MD_CLUSTER_H */

diff --cc drivers/md/md.c
Simple merge