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io_uring/cancel: support opcode based lookup and cancelation 

Add IORING_ASYNC_CANCEL_OP flag for cancelation, which allows the
application to target cancelation based on the opcode of the original
request.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-06-23 10:36:43 -06:00
parent 8165b56604
commit d7b8b079a8
4 changed files with 19 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/uapi/linux/io_uring.h
View File

@ -300,12 +300,14 @@ enum io_uring_op {
* IORING_ASYNC_CANCEL_ANY Match any request
* IORING_ASYNC_CANCEL_FD_FIXED 'fd' passed in is a fixed descriptor
* IORING_ASYNC_CANCEL_USERDATA Match on user_data, default for no other key
* IORING_ASYNC_CANCEL_OP Match request based on opcode
*/
#define IORING_ASYNC_CANCEL_ALL (1U << 0)
#define IORING_ASYNC_CANCEL_FD (1U << 1)
#define IORING_ASYNC_CANCEL_ANY (1U << 2)
#define IORING_ASYNC_CANCEL_FD_FIXED (1U << 3)
#define IORING_ASYNC_CANCEL_USERDATA (1U << 4)
#define IORING_ASYNC_CANCEL_OP (1U << 5)
/*
* send/sendmsg and recv/recvmsg flags (sqe->ioprio)

17
io_uring/cancel.c
View File

@ -22,11 +22,12 @@ struct io_cancel {
u64 addr;
u32 flags;
s32 fd;
u8 opcode;
};
#define CANCEL_FLAGS (IORING_ASYNC_CANCEL_ALL | IORING_ASYNC_CANCEL_FD | \
IORING_ASYNC_CANCEL_ANY | IORING_ASYNC_CANCEL_FD_FIXED | \
IORING_ASYNC_CANCEL_USERDATA)
IORING_ASYNC_CANCEL_USERDATA | IORING_ASYNC_CANCEL_OP)
/*
* Returns true if the request matches the criteria outlined by 'cd'.
@ -38,7 +39,7 @@ bool io_cancel_req_match(struct io_kiocb *req, struct io_cancel_data *cd)
if (req->ctx != cd->ctx)
return false;
if (!(cd->flags & (IORING_ASYNC_CANCEL_FD)))
if (!(cd->flags & (IORING_ASYNC_CANCEL_FD | IORING_ASYNC_CANCEL_OP)))
match_user_data = true;
if (cd->flags & IORING_ASYNC_CANCEL_ANY)
@ -47,6 +48,10 @@ bool io_cancel_req_match(struct io_kiocb *req, struct io_cancel_data *cd)
if (req->file != cd->file)
return false;
}
if (cd->flags & IORING_ASYNC_CANCEL_OP) {
if (req->opcode != cd->opcode)
return false;
}
if (match_user_data && req->cqe.user_data != cd->data)
return false;
if (cd->flags & IORING_ASYNC_CANCEL_ALL) {
@ -127,7 +132,7 @@ int io_async_cancel_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (unlikely(req->flags & REQ_F_BUFFER_SELECT))
return -EINVAL;
if (sqe->off || sqe->len || sqe->splice_fd_in)
if (sqe->off || sqe->splice_fd_in)
return -EINVAL;
cancel->addr = READ_ONCE(sqe->addr);
@ -139,6 +144,11 @@ int io_async_cancel_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return -EINVAL;
cancel->fd = READ_ONCE(sqe->fd);
}
if (cancel->flags & IORING_ASYNC_CANCEL_OP) {
if (cancel->flags & IORING_ASYNC_CANCEL_ANY)
return -EINVAL;
cancel->opcode = READ_ONCE(sqe->len);
}
return 0;
}
@ -185,6 +195,7 @@ int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
.ctx = req->ctx,
.data = cancel->addr,
.flags = cancel->flags,
.opcode = cancel->opcode,
.seq = atomic_inc_return(&req->ctx->cancel_seq),
};
struct io_uring_task *tctx = req->task->io_uring;

2
io_uring/cancel.h
View File

@ -8,11 +8,11 @@ struct io_cancel_data {
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);

3
io_uring/poll.c
View File

@ -851,7 +851,8 @@ static int __io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
struct io_hash_bucket *bucket;
struct io_kiocb *req;
if (cd->flags & (IORING_ASYNC_CANCEL_FD|IORING_ASYNC_CANCEL_ANY))
if (cd->flags & (IORING_ASYNC_CANCEL_FD | IORING_ASYNC_CANCEL_OP |
IORING_ASYNC_CANCEL_ANY))
req = io_poll_file_find(ctx, cd, table, &bucket);
else
req = io_poll_find(ctx, false, cd, table, &bucket);