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md-cluster: Use a small window for resync

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Suspending the entire device for resync could take too long. Resync
in small chunks.

cluster's resync window (32M) is maintained in r1conf as
cluster_sync_low and cluster_sync_high and processed in
raid1's sync_request(). If the current resync is outside the cluster
resync window:

1. Set the cluster_sync_low to curr_resync_completed.
2. Check if the sync will fit in the new window, if not issue a
   wait_barrier() and set cluster_sync_low to sector_nr.
3. Set cluster_sync_high to cluster_sync_low + resync_window.
4. Send a message to all nodes so they may add it in their suspension
   list.

bitmap_cond_end_sync is modified to allow to force a sync inorder
to get the curr_resync_completed uptodate with the sector passed.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Goldwyn Rodrigues
2015-08-19 08:14:42 +10:00
parent 3c462c880b
commit c40f341f1e
9 changed files with 43 additions and 53 deletions
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2
drivers/md/raid10.c
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@@ -3137,7 +3137,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
/* resync. Schedule a read for every block at this virt offset */
int count = 0;
bitmap_cond_end_sync(mddev->bitmap, sector_nr);
bitmap_cond_end_sync(mddev->bitmap, sector_nr, 0);
if (!bitmap_start_sync(mddev->bitmap, sector_nr,
&sync_blocks, mddev->degraded) &&