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authorHannes Reinecke <hare@suse.de>2020-05-11 10:24:16 +0200
committerMike Snitzer <snitzer@redhat.com>2020-05-15 16:29:36 +0200
commitbc3d5717d242a37d2e9ea85d7e7b2e3569324d24 (patch)
tree8f03f96efab1336662a15ab9a777543b6f46c8cb /Documentation/admin-guide
parentdm mpath: add Historical Service Time Path Selector (diff)
downloadlinux-bc3d5717d242a37d2e9ea85d7e7b2e3569324d24.tar.xz
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dm zoned: add 'status' callback
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>
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/device-mapper/dm-zoned.rst16
1 files changed, 16 insertions, 0 deletions
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.