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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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2
include/linux/io_uring.h
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@ -28,7 +28,7 @@ struct io_uring_cmd {
void *cookie;
};
u32 cmd_op;
u32 pad;
u32 flags;
u8 pdu[32]; /* available inline for free use */
};