bcache/md: Use raid stripe size
Now that we've got code for raid5/6 stripe awareness, bcache just needs
to know about the stripes and when writing partial stripes is expensive
- we probably don't want to enable this optimization for raid1 or 10,
even though they have stripes. So add a flag to queue_limits.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 63ebef7..e363efc 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1134,6 +1134,12 @@
hlist_add_head(&io->hash, dc->io_hash + RECENT_IO);
}
+ dc->disk.stripe_size = q->limits.io_opt >> 9;
+
+ if (dc->disk.stripe_size)
+ dc->partial_stripes_expensive =
+ q->limits.raid_partial_stripes_expensive;
+
ret = bcache_device_init(&dc->disk, block_size,
dc->bdev->bd_part->nr_sects - dc->sb.data_offset);
if (ret)