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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
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@@ -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.