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io_uring: add notification slot registration

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Let the userspace to register and unregister notification slots.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a0aa8161fe3ebb2a4cc6e5dbd0cffb96e6881cf5.1657643355.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2022-07-12 21:52:42 +01:00
committed by Jens Axboe
parent 68ef5578ef
commit bc24d6bd32
4 changed files with 72 additions and 0 deletions
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17
include/uapi/linux/io_uring.h
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@@ -457,6 +457,10 @@ enum {
/* register a range of fixed file slots for automatic slot allocation */
IORING_REGISTER_FILE_ALLOC_RANGE = 25,
/* zerocopy notification API */
IORING_REGISTER_NOTIFIERS = 26,
IORING_UNREGISTER_NOTIFIERS = 27,
/* this goes last */
IORING_REGISTER_LAST
};
@@ -503,6 +507,19 @@ struct io_uring_rsrc_update2 {
__u32 resv2;
};
struct io_uring_notification_slot {
__u64 tag;
__u64 resv[3];
};
struct io_uring_notification_register {
__u32 nr_slots;
__u32 resv;
__u64 resv2;
__u64 data;
__u64 resv3;
};
/* Skip updating fd indexes set to this value in the fd table */
#define IORING_REGISTER_FILES_SKIP (-2)