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authorMatias Bjørling <matias.bjorling@wdc.com>2018-07-06 19:38:39 +0200
committerJens Axboe <axboe@kernel.dk>2018-07-09 09:07:55 -0600
commitca4b2a011948fae4e4d31490107db4926385a983 (patch)
tree4fb64aaae7642ec180fae7d9afd16ccd2c09b881 /Documentation/block
parent6dad38d38f20c0c8a84b5ae4f23c62b2c8758ec5 (diff)
null_blk: add zone support
Adds support for exposing a null_blk device through the zone device interface. The interface is managed with the parameters zoned and zone_size. If zoned is set, the null_blk instance registers as a zoned block device. The zone_size parameter defines how big each zone will be. Signed-off-by: Matias Bjørling <matias.bjorling@wdc.com> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/block')
-rw-r--r--Documentation/block/null_blk.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt
index 07f147381f32..ea2dafe49ae8 100644
--- a/Documentation/block/null_blk.txt
+++ b/Documentation/block/null_blk.txt
@@ -85,3 +85,10 @@ shared_tags=[0/1]: Default: 0
0: Tag set is not shared.
1: Tag set shared between devices for blk-mq. Only makes sense with
nr_devices > 1, otherwise there's no tag set to share.
+
+zoned=[0/1]: Default: 0
+ 0: Block device is exposed as a random-access block device.
+ 1: Block device is exposed as a host-managed zoned block device.
+
+zone_size=[MB]: Default: 256
+ Per zone size when exposed as a zoned block device. Must be a power of two.