md: always update level / chunk_size / layout when writing v1.x metadata.
authorNeilBrown <neilb@suse.de>
Mon, 25 May 2009 23:40:59 +0000 (09:40 +1000)
committerNeilBrown <neilb@suse.de>
Mon, 25 May 2009 23:40:59 +0000 (09:40 +1000)
We previously didn't update these fields when writing the metadata
because they could never change.  They can now, so we better write
them.
v0.90 metadata always updated these fields.

Signed-off-by: NeilBrown <neilb@suse.de>

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