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io_uring: mark us with IORING_FEAT_SUBMIT_STABLE

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If this flag is set, applications can be certain that any data for
async offload has been consumed when the kernel has consumed the
SQE.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-12-02 18:51:26 -07:00
parent f499a021ea
commit da8c969069
2 changed files with 3 additions and 1 deletions
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3
fs/io_uring.c
View File

@ -5077,7 +5077,8 @@ static int io_uring_create(unsigned entries, struct io_uring_params *p)
if (ret < 0)
goto err;
p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP;
p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP |
IORING_FEAT_SUBMIT_STABLE;
trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags);
return ret;
err:

1
include/uapi/linux/io_uring.h
View File

@ -157,6 +157,7 @@ struct io_uring_params {
*/
#define IORING_FEAT_SINGLE_MMAP (1U << 0)
#define IORING_FEAT_NODROP (1U << 1)
#define IORING_FEAT_SUBMIT_STABLE (1U << 2)
/*
* io_uring_register(2) opcodes and arguments