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io_uring: add IORING_SETUP_SINGLE_ISSUER

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Add a new IORING_SETUP_SINGLE_ISSUER flag and the userspace visible part
of it, i.e. put limitations of submitters. Also, don't allow it together
with IOPOLL as we're not going to put it to good use.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4bcc41ee467fdf04c8aab8baf6ce3ba21858c3d4.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2022-06-16 10:22:08 +01:00
committed by Jens Axboe
parent 0ec6dca223
commit 97bbdc06a4
5 changed files with 36 additions and 8 deletions
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5
include/uapi/linux/io_uring.h
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@@ -140,9 +140,12 @@ enum {
* IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
*/
#define IORING_SETUP_TASKRUN_FLAG (1U << 9)
#define IORING_SETUP_SQE128 (1U << 10) /* SQEs are 128 byte */
#define IORING_SETUP_CQE32 (1U << 11) /* CQEs are 32 byte */
/*
* Only one task is allowed to submit requests
*/
#define IORING_SETUP_SINGLE_ISSUER (1U << 12)
enum io_uring_op {
IORING_OP_NOP,