From: Goldwyn Rodrigues <rgoldwyn@suse.com>
Date: Sat, 7 Jun 2014 07:39:37 +0000 (-0500)
Subject: Suspend writes in RAID1 if within range
X-Git-Tag: omap-for-v4.1/fixes-rc1~34^2~21^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=589a1c491621ab81a1955d17d634636522c1b4c1;p=pandora-kernel.git

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 6b0dffebc90f..d85a6ca4443e 100644
--- 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 054f9eafa065..03785402afaa 100644
--- 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 */
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