From: Goldwyn Rodrigues <rgoldwyn@suse.com>
Date: Sat, 7 Jun 2014 06:44:51 +0000 (-0500)
Subject: metadata_update sends message to other nodes
X-Git-Tag: omap-for-v4.1/fixes-rc1~34^2~21^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=293467aa1f161cd50920ccf7fc1efa3946a4d50c;p=pandora-kernel.git

metadata_update sends message to other nodes

   - request to send a message
   - make changes to superblock
   - send messages telling everyone that the superblock has changed
   - other nodes all read the superblock
   - other nodes all ack the messages
   - updating node release the "I'm sending a message" resource.

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

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 9a4abe1b4aa4..5db491010835 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -621,11 +621,39 @@ static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
 	dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
 }
 
+static int metadata_update_start(struct mddev *mddev)
+{
+	return lock_comm(mddev->cluster_info);
+}
+
+static int metadata_update_finish(struct mddev *mddev)
+{
+	struct md_cluster_info *cinfo = mddev->cluster_info;
+	struct cluster_msg cmsg;
+	int ret;
+
+	memset(&cmsg, 0, sizeof(cmsg));
+	cmsg.type = cpu_to_le32(METADATA_UPDATED);
+	ret = __sendmsg(cinfo, &cmsg);
+	unlock_comm(cinfo);
+	return ret;
+}
+
+static int metadata_update_cancel(struct mddev *mddev)
+{
+	struct md_cluster_info *cinfo = mddev->cluster_info;
+
+	return dlm_unlock_sync(cinfo->token_lockres);
+}
+
 static struct md_cluster_operations cluster_ops = {
 	.join   = join,
 	.leave  = leave,
 	.slot_number = slot_number,
 	.resync_info_update = resync_info_update,
+	.metadata_update_start = metadata_update_start,
+	.metadata_update_finish = metadata_update_finish,
+	.metadata_update_cancel = metadata_update_cancel,
 };
 
 static int __init cluster_init(void)
diff --git a/drivers/md/md-cluster.h b/drivers/md/md-cluster.h
index 51a24df15b64..658982afcf9b 100644
--- a/drivers/md/md-cluster.h
+++ b/drivers/md/md-cluster.h
@@ -12,6 +12,9 @@ struct md_cluster_operations {
 	int (*leave)(struct mddev *mddev);
 	int (*slot_number)(struct mddev *mddev);
 	void (*resync_info_update)(struct mddev *mddev, sector_t lo, sector_t hi);
+	int (*metadata_update_start)(struct mddev *mddev);
+	int (*metadata_update_finish)(struct mddev *mddev);
+	int (*metadata_update_cancel)(struct mddev *mddev);
 };
 
 #endif /* _MD_CLUSTER_H */
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