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dm zoned: add 'status' callback

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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@suse.de>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Hannes Reinecke 2020-05-11 10:24:16 +02:00 committed by Mike Snitzer
parent 2613eab119
commit bc3d5717d2
4 changed files with 60 additions and 0 deletions
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16
Documentation/admin-guide/device-mapper/dm-zoned.rst
View file

@ -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
drivers/md/dm-zoned-metadata.c
View file

@ -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
drivers/md/dm-zoned-target.c
View file

@ -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
drivers/md/dm-zoned.h
View file

@ -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).