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io_uring: add IORING_CQ_EVENTFD_DISABLED to the CQ ring flags 

This new flag should be set/clear from the application to
disable/enable eventfd notifications when a request is completed
and queued to the CQ ring.

Before this patch, notifications were always sent if an eventfd is
registered, so IORING_CQ_EVENTFD_DISABLED is not set during the
initialization.

It will be up to the application to set the flag after initialization
if no notifications are required at the beginning.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefano Garzarella 2020-05-15 18:38:05 +02:00 committed by Jens Axboe
parent 0d9b5b3af1
commit 7e55a19cf6
2 changed files with 9 additions and 0 deletions
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2
fs/io_uring.c
View File

@ -1153,6 +1153,8 @@ static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx)
{
if (!ctx->cq_ev_fd)
return false;
if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
return false;
if (!ctx->eventfd_async)
return true;
return io_wq_current_is_worker();

7
include/uapi/linux/io_uring.h
View File

@ -209,6 +209,13 @@ struct io_cqring_offsets {
__u64 resv2;
};
/*
* cq_ring->flags
*/
/* disable eventfd notifications */
#define IORING_CQ_EVENTFD_DISABLED (1U << 0)
/*
* io_uring_enter(2) flags
*/