diff options
| author | Ming Lei <ming.lei@redhat.com> | 2023-01-06 12:17:09 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-01-29 15:18:34 -0700 |
| commit | abb864d380854b5427b6b070beb2ebc291ce4d1e (patch) | |
| tree | a044138fccf58aebdb0b0b04814f27878dd742f1 /include/uapi/linux/ublk_cmd.h | |
| parent | bfbcef036396a73fbf4b3fee385cc670159df5ad (diff) | |
ublk_drv: add device parameter UBLK_PARAM_TYPE_DEVT
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>
Diffstat (limited to 'include/uapi/linux/ublk_cmd.h')
| -rw-r--r-- | include/uapi/linux/ublk_cmd.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h index 8f88e3a29998..4e38b9aa0293 100644 --- a/include/uapi/linux/ublk_cmd.h +++ b/include/uapi/linux/ublk_cmd.h @@ -214,6 +214,17 @@ struct ublk_param_discard { __u16 reserved0; }; +/* + * read-only, can't set via UBLK_CMD_SET_PARAMS, disk_devt is available + * after device is started + */ +struct ublk_param_devt { + __u32 char_major; + __u32 char_minor; + __u32 disk_major; + __u32 disk_minor; +}; + struct ublk_params { /* * Total length of parameters, userspace has to set 'len' for both @@ -224,10 +235,12 @@ struct ublk_params { __u32 len; #define UBLK_PARAM_TYPE_BASIC (1 << 0) #define UBLK_PARAM_TYPE_DISCARD (1 << 1) +#define UBLK_PARAM_TYPE_DEVT (1 << 2) __u32 types; /* types of parameter included */ struct ublk_param_basic basic; struct ublk_param_discard discard; + struct ublk_param_devt devt; }; #endif |