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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 04-15-2010, 06:43 AM
NeilBrown
 
Default dm-raid456: add support for setting IO hints.

Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/md/dm-raid456.c | 33 +++++++++++++++++++++++++++++++++
drivers/md/raid5.c | 19 ++++++++++---------
2 files changed, 43 insertions(+), 9 deletions(-)

diff --git a/drivers/md/dm-raid456.c b/drivers/md/dm-raid456.c
index d0e44f2..071a8ae 100644
--- a/drivers/md/dm-raid456.c
+++ b/drivers/md/dm-raid456.c
@@ -434,6 +434,37 @@ 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},
@@ -442,6 +473,8 @@ 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)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 41a905b..138f65f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4906,7 +4906,7 @@ static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded
static int run(mddev_t *mddev)
{
raid5_conf_t *conf;
- int working_disks = 0, chunk_size;
+ int working_disks = 0;
int dirty_parity_disks = 0;
mdk_rdev_t *rdev;
sector_t reshape_offset = 0;
@@ -5113,6 +5113,7 @@ static int run(mddev_t *mddev)
plugger_init(&conf->plug, raid5_unplug);
mddev->plug = &conf->plug;
if (mddev->queue) {
+ int chunk_size;
/* read-ahead size must cover two whole stripes, which
* is 2 * (datadisks) * chunksize where 'n' is the
* number of raid devices
@@ -5130,16 +5131,16 @@ static int run(mddev_t *mddev)

mddev->queue->queue_lock = &conf->device_lock;
mddev->queue->unplug_fn = raid5_unplug_queue;
- }

- chunk_size = mddev->chunk_sectors << 9;
- blk_queue_io_min(mddev->queue, chunk_size);
- blk_queue_io_opt(mddev->queue, chunk_size *
- (conf->raid_disks - conf->max_degraded));
+ chunk_size = mddev->chunk_sectors << 9;
+ blk_queue_io_min(mddev->queue, chunk_size);
+ blk_queue_io_opt(mddev->queue, chunk_size *
+ (conf->raid_disks - conf->max_degraded));

- list_for_each_entry(rdev, &mddev->disks, same_set)
- disk_stack_limits(mddev->gendisk, rdev->bdev,
- rdev->data_offset << 9);
+ list_for_each_entry(rdev, &mddev->disks, same_set)
+ disk_stack_limits(mddev->gendisk, rdev->bdev,
+ rdev->data_offset << 9);
+ }

return 0;
abort:


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Old 06-01-2010, 09:56 AM
NeilBrown
 
Default dm-raid456: add support for setting IO hints.

Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/md/dm-raid456.c | 33 +++++++++++++++++++++++++++++++++
drivers/md/raid5.c | 19 ++++++++++---------
2 files changed, 43 insertions(+), 9 deletions(-)

diff --git a/drivers/md/dm-raid456.c b/drivers/md/dm-raid456.c
index 46a5e29..0b72fa4 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)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index efcea17..be5cab8 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4904,7 +4904,7 @@ static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded
static int run(mddev_t *mddev)
{
raid5_conf_t *conf;
- int working_disks = 0, chunk_size;
+ int working_disks = 0;
int dirty_parity_disks = 0;
mdk_rdev_t *rdev;
sector_t reshape_offset = 0;
@@ -5102,6 +5102,7 @@ static int run(mddev_t *mddev)
plugger_init(&conf->plug, raid5_unplug);
mddev->plug = &conf->plug;
if (mddev->queue) {
+ int chunk_size;
/* read-ahead size must cover two whole stripes, which
* is 2 * (datadisks) * chunksize where 'n' is the
* number of raid devices
@@ -5119,16 +5120,16 @@ static int run(mddev_t *mddev)

mddev->queue->queue_lock = &conf->device_lock;
mddev->queue->unplug_fn = raid5_unplug_queue;
- }

- chunk_size = mddev->chunk_sectors << 9;
- blk_queue_io_min(mddev->queue, chunk_size);
- blk_queue_io_opt(mddev->queue, chunk_size *
- (conf->raid_disks - conf->max_degraded));
+ chunk_size = mddev->chunk_sectors << 9;
+ blk_queue_io_min(mddev->queue, chunk_size);
+ blk_queue_io_opt(mddev->queue, chunk_size *
+ (conf->raid_disks - conf->max_degraded));

- list_for_each_entry(rdev, &mddev->disks, same_set)
- disk_stack_limits(mddev->gendisk, rdev->bdev,
- rdev->data_offset << 9);
+ list_for_each_entry(rdev, &mddev->disks, same_set)
+ disk_stack_limits(mddev->gendisk, rdev->bdev,
+ rdev->data_offset << 9);
+ }

return 0;
abort:


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