linux-stable/io_uring/cancel.h
Jens Axboe 521223d7c2 io_uring/cancel: don't default to setting req->work.cancel_seq
Just leave it unset by default, avoiding dipping into the last
cacheline (which is otherwise untouched) for the fast path of using
poll to drive networked traffic. Add a flag that tells us if the
sequence is valid or not, and then we can defer actually assigning
the flag and sequence until someone runs cancelations.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2024-02-08 13:27:06 -07:00

38 lines
978 B
C

// SPDX-License-Identifier: GPL-2.0
#ifndef IORING_CANCEL_H
#define IORING_CANCEL_H
#include <linux/io_uring_types.h>
struct io_cancel_data {
struct io_ring_ctx *ctx;
union {
u64 data;
struct file *file;
};
u8 opcode;
u32 flags;
int seq;
};
int io_async_cancel_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags);
int io_try_cancel(struct io_uring_task *tctx, struct io_cancel_data *cd,
unsigned int issue_flags);
void init_hash_table(struct io_hash_table *table, unsigned size);
int io_sync_cancel(struct io_ring_ctx *ctx, void __user *arg);
bool io_cancel_req_match(struct io_kiocb *req, struct io_cancel_data *cd);
static inline bool io_cancel_match_sequence(struct io_kiocb *req, int sequence)
{
if ((req->flags & REQ_F_CANCEL_SEQ) && sequence == req->work.cancel_seq)
return true;
req->flags |= REQ_F_CANCEL_SEQ;
req->work.cancel_seq = sequence;
return false;
}
#endif