dm zoned: add 'status' callback (bc3d5717) · Commits · 戴 / test

Documentation/admin-guide/device-mapper/dm-zoned.rst

+16 −0

Original line number	Diff line number	Diff line
		@@ -144,3 +144,19 @@ underlying zoned block device name. Ex::

		echo "0 `blockdev --getsize ${dev}` zoned ${dev}" \| \
		dmsetup create dmz-`basename ${dev}`

		Information about the internal layout and current usage of the zones can
		be obtained with the 'status' callback from dmsetup:

		Ex::

		dmsetup status /dev/dm-X

		will return a line

		0 <size> zoned <nr_zones> zones <nr_unmap_rnd>/<nr_rnd> random <nr_unmap_seq>/<nr_seq> sequential

		where <nr_zones> is the total number of zones, <nr_unmap_rnd> is the number
		of unmapped (ie free) random zones, <nr_rnd> the total number of zones,
		<nr_unmap_seq> the number of unmapped sequential zones, and <nr_seq> the
		total number of sequential zones.

+15 −0

Original line number	Diff line number	Diff line
		@@ -202,6 +202,11 @@ sector_t dmz_start_block(struct dmz_metadata zmd, struct dm_zone zone)
		return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift;
		}

		unsigned int dmz_nr_zones(struct dmz_metadata *zmd)
		{
		return zmd->dev->nr_zones;
		}

		unsigned int dmz_nr_chunks(struct dmz_metadata *zmd)
		{
		return zmd->nr_chunks;
		@@ -217,6 +222,16 @@ unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd)
		return atomic_read(&zmd->unmap_nr_rnd);
		}

		unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd)
		{
		return zmd->nr_seq;
		}

		unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd)
		{
		return atomic_read(&zmd->unmap_nr_seq);
		}

		/*
		* Lock/unlock mapping table.
		* The map lock also protects all the zone lists.

+26 −0

Original line number	Diff line number	Diff line
		@@ -965,6 +965,31 @@ static int dmz_iterate_devices(struct dm_target *ti,
		return fn(ti, dmz->ddev, 0, capacity, data);
		}

		static void dmz_status(struct dm_target *ti, status_type_t type,
		unsigned int status_flags, char *result,
		unsigned int maxlen)
		{
		struct dmz_target *dmz = ti->private;
		ssize_t sz = 0;
		char buf[BDEVNAME_SIZE];

		switch (type) {
		case STATUSTYPE_INFO:
		DMEMIT("%u zones %u/%u random %u/%u sequential",
		dmz_nr_zones(dmz->metadata),
		dmz_nr_unmap_rnd_zones(dmz->metadata),
		dmz_nr_rnd_zones(dmz->metadata),
		dmz_nr_unmap_seq_zones(dmz->metadata),
		dmz_nr_seq_zones(dmz->metadata));
		break;
		case STATUSTYPE_TABLE:
		format_dev_t(buf, dmz->dev->bdev->bd_dev);
		DMEMIT("%s", buf);
		break;
		}
		return;
		}

		static struct target_type dmz_type = {
		.name = "zoned",
		.version = {1, 1, 0},
		@@ -978,6 +1003,7 @@ static struct target_type dmz_type = {
		.postsuspend = dmz_suspend,
		.resume = dmz_resume,
		.iterate_devices = dmz_iterate_devices,
		.status = dmz_status,
		};

		static int __init dmz_init(void)

+3 −0

Original line number	Diff line number	Diff line
		@@ -190,8 +190,11 @@ void dmz_free_zone(struct dmz_metadata zmd, struct dm_zone zone);
		void dmz_map_zone(struct dmz_metadata zmd, struct dm_zone zone,
		unsigned int chunk);
		void dmz_unmap_zone(struct dmz_metadata zmd, struct dm_zone zone);
		unsigned int dmz_nr_zones(struct dmz_metadata *zmd);
		unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd);
		unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd);
		unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd);
		unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd);

		/*
		* Activate a zone (increment its reference count).