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Code

io_uring/mock: allow to choose FMODE_NOWAIT

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Add an option to choose whether the file supports FMODE_NOWAIT, that
changes the execution path io_uring request takes.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1e532565b05a05b23589d237c24ee1a3d90c2fd9.1750599274.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2025-06-30 19:16:54 +01:00 committed by Jens Axboe
parent d1aa034657
commit 2f71d2386f
2 changed files with 12 additions and 1 deletions
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5
include/uapi/linux/io_uring/mock_file.h
View File

@ -6,6 +6,7 @@
enum {
IORING_MOCK_FEAT_CMD_COPY,
IORING_MOCK_FEAT_RW_ZERO,
IORING_MOCK_FEAT_RW_NOWAIT,
IORING_MOCK_FEAT_END,
};
@ -15,6 +16,10 @@ struct io_uring_mock_probe {
__u64 __resv[9];
};
enum {
IORING_MOCK_CREATE_F_SUPPORT_NOWAIT = 1,
};
struct io_uring_mock_create {
__u32 out_fd;
__u32 flags;

8
io_uring/mock_file.c
View File

@ -131,6 +131,8 @@ static const struct file_operations io_mock_fops = {
.llseek = io_mock_llseek,
};
#define IO_VALID_CREATE_FLAGS (IORING_MOCK_CREATE_F_SUPPORT_NOWAIT)
static int io_create_mock_file(struct io_uring_cmd *cmd, unsigned int issue_flags)
{
const struct io_uring_sqe *sqe = cmd->sqe;
@ -157,7 +159,9 @@ static int io_create_mock_file(struct io_uring_cmd *cmd, unsigned int issue_flag
memset(&mc, 0, sizeof(mc));
if (copy_from_user(&mc, uarg, uarg_size))
return -EFAULT;
if (!mem_is_zero(mc.__resv, sizeof(mc.__resv)) || mc.flags)
if (!mem_is_zero(mc.__resv, sizeof(mc.__resv)))
return -EINVAL;
if (mc.flags & ~IO_VALID_CREATE_FLAGS)
return -EINVAL;
if (mc.file_size > SZ_1G)
return -EINVAL;
@ -180,6 +184,8 @@ static int io_create_mock_file(struct io_uring_cmd *cmd, unsigned int issue_flag
file->f_mode |= FMODE_READ | FMODE_CAN_READ |
FMODE_WRITE | FMODE_CAN_WRITE |
FMODE_LSEEK;
if (mc.flags & IORING_MOCK_CREATE_F_SUPPORT_NOWAIT)
file->f_mode |= FMODE_NOWAIT;
mc.out_fd = fd;
if (copy_to_user(uarg, &mc, uarg_size)) {