From 784052ecc6ade6b6acf4f67e4ada8e5f2e6df446 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 31 Mar 2009 15:19:07 +1100 Subject: 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 --- drivers/md/raid5.h | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/md/raid5.h') diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index a081fb40a5a..b9c93280fc1 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -350,6 +350,7 @@ struct raid5_private_data { */ sector_t reshape_safe; int previous_raid_disks; + int prev_chunk; short generation; /* increments with every reshape */ struct list_head handle_list; /* stripes needing handling */ -- cgit v1.2.3