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io_uring: add support for absolute timeouts 

This is a pretty trivial addition on top of the relative timeouts
we have now, but it's handy for ensuring tighter timing for those
that are building scheduling primitives on top of io_uring.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-10-15 16:48:15 -06:00
parent ba5290ccb6
commit a41525ab2e
2 changed files with 17 additions and 5 deletions
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17
fs/io_uring.c
View File

@ -1978,13 +1978,17 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe)
unsigned count;
struct io_ring_ctx *ctx = req->ctx;
struct list_head *entry;
enum hrtimer_mode mode;
struct timespec64 ts;
unsigned span = 0;
unsigned flags;
if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->timeout_flags ||
sqe->len != 1)
if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len != 1)
return -EINVAL;
flags = READ_ONCE(sqe->timeout_flags);
if (flags & ~IORING_TIMEOUT_ABS)
return -EINVAL;
if (get_timespec64(&ts, u64_to_user_ptr(sqe->addr)))
@ -2042,10 +2046,13 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe)
list_add(&req->list, entry);
spin_unlock_irq(&ctx->completion_lock);
hrtimer_init(&req->timeout.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
if (flags & IORING_TIMEOUT_ABS)
mode = HRTIMER_MODE_ABS;
else
mode = HRTIMER_MODE_REL;
hrtimer_init(&req->timeout.timer, CLOCK_MONOTONIC, mode);
req->timeout.timer.function = io_timeout_fn;
hrtimer_start(&req->timeout.timer, timespec64_to_ktime(ts),
HRTIMER_MODE_REL);
hrtimer_start(&req->timeout.timer, timespec64_to_ktime(ts), mode);
return 0;
}

5
include/uapi/linux/io_uring.h
View File

@ -70,6 +70,11 @@ struct io_uring_sqe {
*/
#define IORING_FSYNC_DATASYNC (1U << 0)
/*
* sqe->timeout_flags
*/
#define IORING_TIMEOUT_ABS (1U << 0)
/*
* IO completion data structure (Completion Queue Entry)
*/