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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>
This commit is contained in:
Guoqing Jiang 2015-07-10 16:54:04 +08:00 committed by NeilBrown
parent 05cd0e5176
commit dc737d7c3d
2 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/md/md-cluster.c
View File

@ -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,

6
drivers/md/md.c
View File

@ -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);