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io_uring: trigger eventfd for IOPOLL

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Make sure io_iopoll_complete() tries to wake up eventfd, which currently
is skipped together with io_cqring_ev_posted() for non-SQPOLL IOPOLL.

Add an iopoll version of io_cqring_ev_posted(), duplicates a bit of
code, but they actually use different sets of wait queues may be for
better.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-01-07 03:15:41 +00:00 committed by Jens Axboe
parent 3e2224c586
commit 80c18e4ac2
1 changed files with 11 additions and 2 deletions
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13
fs/io_uring.c
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@ -1713,6 +1713,16 @@ static void io_cqring_ev_posted(struct io_ring_ctx *ctx)
eventfd_signal(ctx->cq_ev_fd, 1);
}
static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx)
{
if (ctx->flags & IORING_SETUP_SQPOLL) {
if (waitqueue_active(&ctx->wait))
wake_up(&ctx->wait);
}
if (io_should_trigger_evfd(ctx))
eventfd_signal(ctx->cq_ev_fd, 1);
}
/* Returns true if there are no backlogged entries after the flush */
static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force,
struct task_struct *tsk,
@ -2428,8 +2438,7 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
}
io_commit_cqring(ctx);
if (ctx->flags & IORING_SETUP_SQPOLL)
io_cqring_ev_posted(ctx);
io_cqring_ev_posted_iopoll(ctx);
io_req_free_batch_finish(ctx, &rb);
if (!list_empty(&again))