From: NeilBrown <neilb@suse.de>
Date: Mon, 13 Oct 2008 00:55:12 +0000 (+1100)
Subject: md: Relax minimum size restrictions on chunk_size.
X-Git-Tag: v2.6.28-rc1~288^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4bbf3771ca40d0aaec8316d0e7476b16010288e5;p=pandora-kernel.git

md: Relax minimum size restrictions on chunk_size.

Currently, the 'chunk_size' of an array must be at-least PAGE_SIZE.

This makes moving an array to a machine with a larger PAGE_SIZE, or
changing the kernel to use a larger PAGE_SIZE, can stop an array from
working.

For RAID10 and RAID4/5/6, this is non-trivial to fix as the resync
process works on whole pages at a time, and assumes them to be wholly
within a stripe.  For other raid personalities, this restriction is
not needed at all and can be dropped.

So remove the test on chunk_size from common can, and add it in just
the places where it is needed: raid10 and raid4/5/6.

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