Suspend writes in RAID1 if within range

If there is a resync going on, all nodes must suspend writes to the
range. This is recorded in the suspend_info/suspend_list.

If there is an I/O within the ranges of any of the suspend_info,
should_suspend will return 1.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 6b0dffe..d85a6ca 100644 (file)
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -723,6 +723,25 @@ static void resync_finish(struct mddev *mddev)
        resync_send(mddev, RESYNCING, 0, 0);
 }
 
+static int area_resyncing(struct mddev *mddev, sector_t lo, sector_t hi)
+{
+       struct md_cluster_info *cinfo = mddev->cluster_info;
+       int ret = 0;
+       struct suspend_info *s;
+
+       spin_lock_irq(&cinfo->suspend_lock);
+       if (list_empty(&cinfo->suspend_list))
+               goto out;
+       list_for_each_entry(s, &cinfo->suspend_list, list)
+               if (hi > s->lo && lo < s->hi) {
+                       ret = 1;
+                       break;
+               }
+out:
+       spin_unlock_irq(&cinfo->suspend_lock);
+       return ret;
+}
+
 static struct md_cluster_operations cluster_ops = {
        .join   = join,
        .leave  = leave,
@@ -733,6 +752,7 @@ static struct md_cluster_operations cluster_ops = {
        .metadata_update_start = metadata_update_start,
        .metadata_update_finish = metadata_update_finish,
        .metadata_update_cancel = metadata_update_cancel,
+       .area_resyncing = area_resyncing,
 };
 
 static int __init cluster_init(void)

diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h
index 054f9ea..0378540 100644 (file)
--- a/drivers/md/md-cluster.h
+++ b/drivers/md/md-cluster.h
@@ -17,6 +17,7 @@ struct md_cluster_operations {
        int (*metadata_update_start)(struct mddev *mddev);
        int (*metadata_update_finish)(struct mddev *mddev);
        int (*metadata_update_cancel)(struct mddev *mddev);
+       int (*area_resyncing)(struct mddev *mddev, sector_t lo, sector_t hi);
 };
 
 #endif /* _MD_CLUSTER_H */

diff --cc drivers/md/md.c
Simple merge

diff --cc drivers/md/raid1.c
Simple merge