From: NeilBrown Date: Tue, 31 Mar 2009 04:19:07 +0000 (+1100) Subject: md/raid5: prepare for allowing reshape to change chunksize. X-Git-Tag: v2.6.30-rc1~241^2~8 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=784052ecc6ade6b6acf4f67e4ada8e5f2e6df446;p=pandora-kernel.git md/raid5: prepare for allowing reshape to change chunksize. Add "prev_chunk" to raid5_conf_t, similar to "previous_raid_disks", to remember what the chunk size was before the reshape that is currently underway. This seems like duplication with "chunk_size" and "new_chunk" in mddev_t, and to some extent it is, but there are differences. The values in mddev_t are always defined and often the same. The prev* values are only defined if a reshape is underway. Also (and more significantly) the raid5_conf_t values will be changed at the same time (inside an appropriate lock) that the reshape is started by setting reshape_position. In contrast, the new_chunk value is set when the sysfs file is written which could be well before the reshape starts. Signed-off-by: NeilBrown --- Reading git-diff-tree failed