OpenSDV
/
original_kernel
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

io_uring: support to inject result for NOP 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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;
}