ublk_drv: add device parameter UBLK_PARAM_TYPE_DEVT

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Userspace side only knows device ID, but the associated path of ublkc* and
ublkb* could be changed by udev, and that depends on userspace's policy, so
add parameter of UBLK_PARAM_TYPE_DEVT for retrieving major/minor of the
ublkc* and ublkb*, then user may figure out major/minor of the ublk disks
he/she owns. With major/minor, it is easy to find the device node path.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230106041711.914434-5-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Ming Lei 2023-01-06 12:17:09 +08:00 • committed by Jens Axboe

parent bfbcef0363

commit abb864d380

2 changed files with 36 additions and 1 deletions

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24

drivers/block/ublk_drv.c

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13

include/uapi/linux/ublk_cmd.h

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