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io_uring: add support for level triggered poll

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By default, the POLL_ADD command does edge triggered poll - if we get
a non-zero mask on the initial poll attempt, we complete the request
successfully.

Support level triggered by always waiting for a notification, regardless
of whether or not the initial mask matches the file state.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-05-27 10:55:07 -06:00
parent d9b57aa3cf
commit b9ba8a4463
2 changed files with 13 additions and 5 deletions
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3
include/uapi/linux/io_uring.h
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@ -229,10 +229,13 @@ enum io_uring_op {
*
* IORING_POLL_UPDATE Update existing poll request, matching
* sqe->addr as the old user_data field.
*
* IORING_POLL_LEVEL Level triggered poll.
*/
#define IORING_POLL_ADD_MULTI (1U << 0)
#define IORING_POLL_UPDATE_EVENTS (1U << 1)
#define IORING_POLL_UPDATE_USER_DATA (1U << 2)
#define IORING_POLL_ADD_LEVEL (1U << 3)
/*
* ASYNC_CANCEL flags.