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io_uring: introduce fixed buffer support for io_uring_cmd

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Add IORING_URING_CMD_FIXED flag that is to be used for sending io_uring
command with previously registered buffers. User-space passes the buffer
index in sqe->buf_index, same as done in read/write variants that uses
fixed buffers.

Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20220930062749.152261-3-anuj20.g@samsung.com
[axboe: shuffle valid flags check before acting on it]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Anuj Gupta 2022-09-30 11:57:39 +05:30 • committed by Jens Axboe
parent a9216fac3e
commit 9cda70f622
3 changed files with 28 additions and 2 deletions
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9
include/uapi/linux/io_uring.h
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@ -56,6 +56,7 @@ struct io_uring_sqe {
__u32 hardlink_flags;
__u32 xattr_flags;
__u32 msg_ring_flags;
__u32 uring_cmd_flags;
};
__u64 user_data; /* data to be passed back at completion time */
/* pack this to avoid bogus arm OABI complaints */
@ -219,6 +220,14 @@ enum io_uring_op {
IORING_OP_LAST,
};
/*
* sqe->uring_cmd_flags
* IORING_URING_CMD_FIXED use registered buffer; pass thig flag
* along with setting sqe->buf_index.
*/
#define IORING_URING_CMD_FIXED (1U << 0)
/*
* sqe->fsync_flags
*/