md-cluster: transfer the resync ownership to another node
When node A stops an array while the array is doing a resync, we need
to let another node B take over the resync task.
To achieve the goal, we need the A send an explicit BITMAP_NEEDS_SYNC
message to the cluster. And the node B which received that message will
invoke __recover_slot to do resync.
Reviewed-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 24caabe..47199ad 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -75,6 +75,7 @@
NEWDISK,
REMOVE,
RE_ADD,
+ BITMAP_NEEDS_SYNC,
};
struct cluster_msg {
@@ -454,6 +455,11 @@
__func__, __LINE__, msg->slot);
process_readd_disk(mddev, msg);
break;
+ case BITMAP_NEEDS_SYNC:
+ pr_info("%s: %d Received BITMAP_NEEDS_SYNC from %d\n",
+ __func__, __LINE__, msg->slot);
+ __recover_slot(mddev, msg->slot);
+ break;
default:
pr_warn("%s:%d Received unknown message from %d\n",
__func__, __LINE__, msg->slot);
@@ -814,8 +820,17 @@
static void resync_finish(struct mddev *mddev)
{
+ struct md_cluster_info *cinfo = mddev->cluster_info;
+ struct cluster_msg cmsg;
+ int slot = cinfo->slot_number - 1;
+
pr_info("%s:%d\n", __func__, __LINE__);
resync_send(mddev, RESYNCING, 0, 0);
+ if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
+ cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
+ cmsg.slot = cpu_to_le32(slot);
+ sendmsg(cinfo, &cmsg);
+ }
}
static int area_resyncing(struct mddev *mddev, int direction,