Add callback to supply information for 'dmsetup status'
and 'dmsetup table'. The output for 'dmsetup status' is
0 <size> zoned <nr_zones> zones <nr_unmap_rnd>/<nr_rnd> random <nr_unmap_seq>/<nr_seq> sequential
where <nr_unmap_rnd> is the number of unmapped (ie free) random zones,
<nr_rnd> the total number of random zones, <nr_unmap_seq> the number
of unmapped sequential zones, and <nr_seq> the total number of
sequential zones.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Bob Liu <bob.liu@xxxxxxxxxx>
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxx>
---
.../admin-guide/device-mapper/dm-zoned.rst | 16 +++++++++++++
drivers/md/dm-zoned-metadata.c | 15 +++++++++++++
drivers/md/dm-zoned-target.c | 26 ++++++++++++++++++++++
drivers/md/dm-zoned.h | 3 +++
4 files changed, 60 insertions(+)
diff --git a/Documentation/admin-guide/device-mapper/dm-zoned.rst b/Documentation/admin-guide/device-mapper/dm-zoned.rst
index 07f56ebc1730..4165fbf1aeb6 100644
--- a/Documentation/admin-guide/device-mapper/dm-zoned.rst
+++ b/Documentation/admin-guide/device-mapper/dm-zoned.rst
@@ -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.
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 369de15c4e80..c8787560fa9f 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -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.
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index f4f83d39b3dc..0b4b27d280fb 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -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)
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index 5b5e493d479c..884c0e586082 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -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).
--
2.16.4
--
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