Commit dc737d7c authored by Guoqing Jiang's avatar Guoqing Jiang Committed by NeilBrown
Browse files

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: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: default avatarGuoqing Jiang <gqjiang@suse.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
parent 05cd0e51

drivers/md/md-cluster.c

+15 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ enum msg_type { 
	NEWDISK,

	REMOVE,

	RE_ADD,

	BITMAP_NEEDS_SYNC,

};



struct cluster_msg {
@@ -454,6 +455,11 @@ static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) 
			__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 int resync_start(struct mddev *mddev, sector_t lo, sector_t hi) 


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,

drivers/md/md.c

+3 −3
Original line number Diff line number Diff line
@@ -7959,9 +7959,6 @@ void md_do_sync(struct md_thread *thread) 
	/* tell personality that we are finished */

	mddev->pers->sync_request(mddev, max_sectors, &skipped);



	if (mddev_is_clustered(mddev))

		md_cluster_ops->resync_finish(mddev);



	if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&

	    mddev->curr_resync > 2) {

		if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
@@ -7995,6 +7992,9 @@ void md_do_sync(struct md_thread *thread) 
		}

	}

 skip:

	if (mddev_is_clustered(mddev))

		md_cluster_ops->resync_finish(mddev);



	set_bit(MD_CHANGE_DEVS, &mddev->flags);



	spin_lock(&mddev->lock);

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