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md-cluster: send BITMAP_NEEDS_SYNC when node is leaving cluster 

Previously, BITMAP_NEEDS_SYNC message is sent when the resyc
aborts, but it could abort for different reasons, and not all
of reasons require another node to take over the resync ownship.

It is better make BITMAP_NEEDS_SYNC message only be sent when
the node is leaving cluster with dirty bitmap. And we also need
to ensure dlm connection is ok.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Guoqing Jiang 2015-10-01 00:09:18 +08:00 committed by Goldwyn Rodrigues
parent c40f341f1e
commit 099954119d
1 changed files with 20 additions and 0 deletions
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20
drivers/md/md-cluster.c
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@ -774,12 +774,32 @@ static int join(struct mddev *mddev, int nodes)
return ret;
}
static void resync_bitmap(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
struct cluster_msg cmsg = {0};
int err;
cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
err = sendmsg(cinfo, &cmsg);
if (err)
pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
__func__, __LINE__, err);
}
static int leave(struct mddev *mddev)
{
struct md_cluster_info *cinfo = mddev->cluster_info;
if (!cinfo)
return 0;
/* BITMAP_NEEDS_SYNC message should be sent when node
* is leaving the cluster with dirty bitmap, also we
* can only deliver it when dlm connection is available */
if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector)
resync_bitmap(mddev);
md_unregister_thread(&cinfo->recovery_thread);
md_unregister_thread(&cinfo->recv_thread);
lockres_free(cinfo->message_lockres);