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io_uring: support to inject result for NOP

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Support to inject result for NOP so that we can inject failure from
userspace. It is very helpful for covering failure handling code in
io_uring core change.

With nop flags, it becomes possible to add more test features on NOP in
future.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240510035031.78874-3-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2024-05-10 11:50:28 +08:00 committed by Jens Axboe
parent 3d8f874bd6
commit deb1e496a8
2 changed files with 29 additions and 5 deletions
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8
include/uapi/linux/io_uring.h
View File

@ -72,6 +72,7 @@ struct io_uring_sqe {
__u32 waitid_flags;
__u32 futex_flags;
__u32 install_fd_flags;
__u32 nop_flags;
};
__u64 user_data; /* data to be passed back at completion time */
/* pack this to avoid bogus arm OABI complaints */
@ -407,6 +408,13 @@ enum io_uring_msg_ring_flags {
*/
#define IORING_FIXED_FD_NO_CLOEXEC (1U << 0)
/*
* IORING_OP_NOP flags (sqe->nop_flags)
*
* IORING_NOP_INJECT_RESULT Inject result from sqe->result
*/
#define IORING_NOP_INJECT_RESULT (1U << 0)
/*
* IO completion data structure (Completion Queue Entry)
*/

26
io_uring/nop.c
View File

@ -10,18 +10,34 @@
#include "io_uring.h"
#include "nop.h"
struct io_nop {
/* NOTE: kiocb has the file as the first member, so don't do it here */
struct file *file;
int result;
};
int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
if (READ_ONCE(sqe->rw_flags))
unsigned int flags;
struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
flags = READ_ONCE(sqe->nop_flags);
if (flags & ~IORING_NOP_INJECT_RESULT)
return -EINVAL;
if (flags & IORING_NOP_INJECT_RESULT)
nop->result = READ_ONCE(sqe->len);
else
nop->result = 0;
return 0;
}
/*
* IORING_OP_NOP just posts a completion event, nothing else.
*/
int io_nop(struct io_kiocb *req, unsigned int issue_flags)
{
io_req_set_res(req, 0, 0);
struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
if (nop->result < 0)
req_set_fail(req);
io_req_set_res(req, nop->result, 0);
return IOU_OK;
}