From: NeilBrown <neilb@suse.de>
Date: Tue, 1 Jun 2010 09:37:34 +0000 (+1000)
Subject: md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.
X-Git-Tag: v2.6.36-rc1~280^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e384e58549a2e9a83071ad80280c1a9053cfd84c;p=pandora-kernel.git

md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.

This allows md/raid5 to fully work as a dm target.

Normally md uses a 'filemap' which contains a list of pages of bits
each of which may be written separately.
dm-log uses and all-or-nothing approach to writing the log, so
when using a dm-log, ->filemap is NULL and the flags normally stored
in filemap_attr are stored in ->logattrs instead.



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