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io_uring: retain top 8bits of uring_cmd flags for kernel internal use

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Retain top 8bits of uring_cmd flags for kernel internal use, so that we
can move IORING_URING_CMD_POLLED out of uapi header.

Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Reviewed-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2023-09-28 20:43:24 +08:00 committed by Jens Axboe
parent f31ecf671d
commit 528ce67817
4 changed files with 9 additions and 4 deletions
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3
include/linux/io_uring.h
View file

@ -22,6 +22,9 @@ enum io_uring_cmd_flags {
IO_URING_F_IOPOLL = (1 << 10),
};
/* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */
#define IORING_URING_CMD_POLLED (1U << 31)
struct io_uring_cmd {
struct file *file;
const struct io_uring_sqe *sqe;

5
include/uapi/linux/io_uring.h
View file

@ -249,13 +249,12 @@ enum io_uring_op {
};
/*
* sqe->uring_cmd_flags
* sqe->uring_cmd_flags top 8bits aren't available for userspace
* IORING_URING_CMD_FIXED use registered buffer; pass this flag
* along with setting sqe->buf_index.
* IORING_URING_CMD_POLLED driver use only
*/
#define IORING_URING_CMD_FIXED (1U << 0)
#define IORING_URING_CMD_POLLED (1U << 31)
#define IORING_URING_CMD_MASK IORING_URING_CMD_FIXED
/*

3
io_uring/io_uring.c
View file

@ -4669,6 +4669,9 @@ static int __init io_uring_init(void)
BUILD_BUG_ON(sizeof(atomic_t) != sizeof(u32));
/* top 8bits are for internal use */
BUILD_BUG_ON((IORING_URING_CMD_MASK & 0xff000000) != 0);
io_uring_optable_init();
/*

2
io_uring/uring_cmd.c
View file

@ -91,7 +91,7 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return -EINVAL;
ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
if (ioucmd->flags & ~IORING_URING_CMD_FIXED)
if (ioucmd->flags & ~IORING_URING_CMD_MASK)
return -EINVAL;
if (ioucmd->flags & IORING_URING_CMD_FIXED) {