From: NeilBrown Add .iterate_devices function which should be implemented for all DM targets. Add an .io_hints function too because the provided topology information is particularly important for a raid device. Cc: linux-raid@vger.kernel.org Signed-off-by: NeilBrown Signed-off-by: Jonathan Brassow Signed-off-by: Mike Snitzer --- drivers/md/dm-raid.c | 33 +++++++++++++++++++++++++++++++++ drivers/md/dm-raid.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) Index: linux-2.6.37/drivers/md/dm-raid.c =================================================================== --- linux-2.6.37.orig/drivers/md/dm-raid.c +++ linux-2.6.37/drivers/md/dm-raid.c @@ -575,6 +575,37 @@ static int raid_status(struct dm_target return 0; } +static int raid_iterate_devices(struct dm_target *ti, + iterate_devices_callout_fn fn, + void *data) +{ + struct raid_set *rs = ti->private; + int ret = 0; + unsigned i = 0; + + for (i = 0; !ret && i < rs->md.raid_disks; i++) + if (rs->dev[i].data_dev) + ret = fn(ti, + rs->dev[i].data_dev, + 0, /* No offset on data devs */ + rs->md.dev_sectors, + data); + + return ret; +} + +static void raid_io_hints(struct dm_target *ti, + struct queue_limits *limits) +{ + struct raid_set *rs = ti->private; + unsigned chunk_size = rs->md.chunk_sectors << 9; + raid5_conf_t *conf = rs->md.private; + + blk_limits_io_min(limits, chunk_size); + blk_limits_io_opt(limits, chunk_size * + (conf->raid_disks - conf->max_degraded)); +} + static struct target_type raid_target = { .name = "raid", .version = {1, 0, 0}, @@ -583,6 +614,8 @@ static struct target_type raid_target = .dtr = raid_dtr, .map = raid_map, .status = raid_status, + .iterate_devices = raid_iterate_devices, + .io_hints = raid_io_hints, }; static int __init dm_raid_init(void)