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authorNeilBrown <neilb@suse.de>2009-03-31 15:19:07 +1100
committerNeilBrown <neilb@suse.de>2009-03-31 15:19:07 +1100
commit784052ecc6ade6b6acf4f67e4ada8e5f2e6df446 (patch)
treef0b1060215922ba30a4d676a00dbdad8ddb724c9 /drivers/md/raid5.h
parent86b42c713be3e5f6807aa14b4cbdb005d35c64d5 (diff)
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 <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid5.h')
-rw-r--r--drivers/md/raid5.h1
1 files changed, 1 insertions, 0 deletions
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 */