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md-cluster: Perform resync/recovery under a DLM lock

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Resync or recovery must be performed by only one node at a time.
A DLM lock resource, resync_lockres provides the mutual exclusion
so that only one node performs the recovery/resync at a time.

If a node is unable to get the resync_lockres, because recovery is
being performed by another node, it set MD_RECOVER_NEEDED so as
to schedule recovery in the future.

Remove the debug message in resync_info_update()
used during development.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
This commit is contained in:
Goldwyn Rodrigues
2015-09-30 13:20:35 -05:00
parent 2aa82191ac
commit c186b128cd
4 changed files with 53 additions and 9 deletions
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2
drivers/md/raid1.c
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@@ -2503,8 +2503,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipp
if (mddev_is_clustered(mddev)) {
conf->cluster_sync_low = 0;
conf->cluster_sync_high = 0;
/* Send zeros to mark end of resync */
md_cluster_ops->resync_info_update(mddev, 0, 0);
}
return 0;
}