Send RESYNCING while performing resync start/stop

When a resync is initiated, RESYNCING message is sent to all active
nodes with the range (lo,hi). When the resync is over, a RESYNCING
message is sent with (0,0). A high sector value of zero indicates
that the resync is over.

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

3 files changed, 36 insertions, 2 deletions

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 7e419f05b568..6428cc3ce38d 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -647,11 +647,43 @@ static int metadata_update_cancel(struct mddev *mddev)
         return dlm_unlock_sync(cinfo->token_lockres);
 }
 
+static int resync_send(struct mddev *mddev, enum msg_type type,
+                sector_t lo, sector_t hi)
+{
+        struct md_cluster_info *cinfo = mddev->cluster_info;
+        struct cluster_msg cmsg;
+        int slot = cinfo->slot_number - 1;
+
+        pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__,
+                        (unsigned long long)lo,
+                        (unsigned long long)hi);
+        resync_info_update(mddev, lo, hi);
+        cmsg.type = cpu_to_le32(type);
+        cmsg.slot = cpu_to_le32(slot);
+        cmsg.low = cpu_to_le64(lo);
+        cmsg.high = cpu_to_le64(hi);
+        return sendmsg(cinfo, &cmsg);
+}
+
+static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi)
+{
+        pr_info("%s:%d\n", __func__, __LINE__);
+        return resync_send(mddev, RESYNCING, lo, hi);
+}
+
+static void resync_finish(struct mddev *mddev)
+{
+        pr_info("%s:%d\n", __func__, __LINE__);
+        resync_send(mddev, RESYNCING, 0, 0);
+}
+
 static struct md_cluster_operations cluster_ops = {
         .join   = join,
         .leave  = leave,
         .slot_number = slot_number,
         .resync_info_update = resync_info_update,
+        .resync_start = resync_start,
+        .resync_finish = resync_finish,
         .metadata_update_start = metadata_update_start,
         .metadata_update_finish = metadata_update_finish,
         .metadata_update_cancel = metadata_update_cancel,
diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h
index 658982afcf9b..054f9eafa065 100644
--- a/drivers/md/md-cluster.h
+++ b/drivers/md/md-cluster.h
@@ -12,6 +12,8 @@ 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 (*resync_start)(struct mddev *mddev, sector_t lo, sector_t hi);
+        void (*resync_finish)(struct mddev *mddev);
         int (*metadata_update_start)(struct mddev *mddev);
         int (*metadata_update_finish)(struct mddev *mddev);
         int (*metadata_update_cancel)(struct mddev *mddev);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3eb45dc0537f..a1af24d369fc 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7692,7 +7692,7 @@ void md_do_sync(struct md_thread *thread)
         update_time = jiffies;
 
         if (mddev_is_clustered(mddev))
-                md_cluster_ops->resync_info_update(mddev, j, max_sectors);
+                md_cluster_ops->resync_start(mddev, j, max_sectors);
 
         blk_start_plug(&plug);
         while (j < max_sectors) {
@@ -7817,7 +7817,7 @@ void md_do_sync(struct md_thread *thread)
         mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
 
         if (mddev_is_clustered(mddev))
-                md_cluster_ops->resync_info_update(mddev, 0, 0);
+                md_cluster_ops->resync_finish(mddev);
 
         if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
             mddev->curr_resync > 2) {