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[dm-devel] mirroring: [patch 6 of 6] device failure tolerance



This patch changes how suspend works in dm.c (dm_suspend). As a result, it breaks multipath. It is necessary for cluster mirroring to ensure that a suspend happens before other nodes have a chance at getting an inconsistent read.

 brassow

diff -urN linux-2.6.12-00005/drivers/md/dm.c linux-2.6.12-00006/drivers/md/dm.c
--- linux-2.6.12-00005/drivers/md/dm.c 2005-06-17 14:48:29.000000000 -0500
+++ linux-2.6.12-00006/drivers/md/dm.c 2005-06-30 01:06:36.146154215 -0500
@@ -1055,14 +1055,14 @@
if (test_bit(DMF_BLOCK_IO, &md->flags))
goto out_read_unlock;


-	error = __lock_fs(md);
-	if (error)
-		goto out_read_unlock;
-
 	map = dm_get_table(md);
 	if (map)
 		dm_table_presuspend_targets(map);

+	error = __lock_fs(md);
+	if (error)
+		goto out_read_unlock;
+
 	up_read(&md->lock);

 	/*


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