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    c40f341f
    md-cluster: Use a small window for resync · c40f341f
    Goldwyn Rodrigues authored
    
    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: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
    Signed-off-by: default avatarNeilBrown <neilb@suse.de>
    c40f341f
    History
    md-cluster: Use a small window for resync
    Goldwyn Rodrigues authored
    
    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: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
    Signed-off-by: default avatarNeilBrown <neilb@suse.de>
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