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ublk_cmd.h: add one new ublk command: UBLK_IO_NEED_GET_DATA

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Add one new ublk command: UBLK_IO_NEED_GET_DATA. It is prepared for a new
feature designed for a user application who wants to allocate IO buffer
and set IO buffer address only after it receives an IO request from
ublksrv.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: ZiyangZhang <ZiyangZhang@linux.alibaba.com>
Link: https://lore.kernel.org/r/c8a64b6b51c78340da7daa9e1054608695e79619.1659011443.git.ZiyangZhang@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
ZiyangZhang 2022-07-28 20:39:15 +08:00 committed by Jens Axboe
parent 4bf9cbf3e9
commit 4e18403d94
1 changed files with 18 additions and 0 deletions
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18
include/uapi/linux/ublk_cmd.h
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@ -30,12 +30,21 @@
* this IO request, request's handling result is committed to ublk
* driver, meantime FETCH_REQ is piggyback, and FETCH_REQ has to be
* handled before completing io request.
*
* NEED_GET_DATA: only used for write requests to set io addr and copy data
* When NEED_GET_DATA is set, ublksrv has to issue UBLK_IO_NEED_GET_DATA
* command after ublk driver returns UBLK_IO_RES_NEED_GET_DATA.
*
* It is only used if ublksrv set UBLK_F_NEED_GET_DATA flag
* while starting a ublk device.
*/
#define UBLK_IO_FETCH_REQ 0x20
#define UBLK_IO_COMMIT_AND_FETCH_REQ 0x21
#define UBLK_IO_NEED_GET_DATA 0x22
/* only ABORT means that no re-fetch */
#define UBLK_IO_RES_OK 0
#define UBLK_IO_RES_NEED_GET_DATA 1
#define UBLK_IO_RES_ABORT (-ENODEV)
#define UBLKSRV_CMD_BUF_OFFSET 0
@ -56,6 +65,15 @@
*/
#define UBLK_F_URING_CMD_COMP_IN_TASK (1ULL << 1)
/*
* User should issue io cmd again for write requests to
* set io buffer address and copy data from bio vectors
* to the userspace io buffer.
*
* In this mode, task_work is not used.
*/
#define UBLK_F_NEED_GET_DATA (1UL << 2)
/* device state */
#define UBLK_S_DEV_DEAD 0
#define UBLK_S_DEV_LIVE 1