From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: [PATCH 4/8] dm-raid456: add support for setting IO hints. Date: Mon, 26 Jul 2010 13:24:35 +1000 Message-ID: <20100726032435.29687.50704.stgit@localhost.localdomain> References: <20100726032230.29687.5366.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20100726032230.29687.5366.stgit@localhost.localdomain> Sender: linux-raid-owner@vger.kernel.org To: Heinz Mauelshagen , Alasdair G Kergon Cc: linux-raid@vger.kernel.org, dm-devel@redhat.com List-Id: linux-raid.ids Signed-off-by: NeilBrown --- drivers/md/dm-raid456.c | 33 +++++++++++++++++++++++++++++++++ 1 files changed, 33 insertions(+), 0 deletions(-) diff --git a/drivers/md/dm-raid456.c b/drivers/md/dm-raid456.c index 47db9d4..4ffd654 100644 --- a/drivers/md/dm-raid456.c +++ b/drivers/md/dm-raid456.c @@ -435,6 +435,37 @@ static int raid_status(struct dm_target *ti, status_type_t type, 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].dev) + ret = fn(ti, + rs->dev[i].dev, + rs->dev[i].rdev.data_offset, + 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 = "raid45", .version = {1, 0, 0}, @@ -443,6 +474,8 @@ 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)