[PATCH] md: expose md metadata format in sysfs
Allow it to be set to a particular version, or 'none'.
Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/Documentation/md.txt b/Documentation/md.txt
index 0a2e10a..c5512af 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -183,6 +183,12 @@
the array if the personality supports it (raid1, raid5, raid6),
and if the component drives are large enough.
+ metadata_version
+ This indicates the format that is being used to record metadata
+ about the array. It can be 0.90 (traditional format), 1.0, 1.1,
+ 1.2 (newer format in varying locations) or "none" indicating that
+ the kernel isn't managing metadata at all.
+
As component devices are added to an md array, they appear in the 'md'
directory as new directories named
dev-XXX