linux-kernel - Re: [PATCH liburing 1/2] splice: add splice(2) helpers

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Date:   Sun, 16 Feb 2020 04:34:59 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH liburing 1/2] splice: add splice(2) helpers

On 16/02/2020 01:16, Pavel Begunkov wrote:
> Add splice helpers and update io_uring.h
> 
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
> ---
> 
> Quick update for extra newline and the fixed fd comment
> 
>  src/include/liburing.h          | 11 +++++++++++
>  src/include/liburing/io_uring.h | 14 +++++++++++++-
>  2 files changed, 24 insertions(+), 1 deletion(-)
> 
> diff --git a/src/include/liburing.h b/src/include/liburing.h
> index 8ca6cd9..0628255 100644
> --- a/src/include/liburing.h
> +++ b/src/include/liburing.h
> @@ -191,6 +191,17 @@ static inline void io_uring_prep_rw(int op, struct io_uring_sqe *sqe, int fd,
>  	sqe->__pad2[0] = sqe->__pad2[1] = sqe->__pad2[2] = 0;
>  }
>  
> +static void io_uring_prep_splice(struct io_uring_sqe *sqe,

And it still misses inline... My bad, I'll resend tomorrow.



> +				 int fd_in, loff_t off_in,
> +				 int fd_out, loff_t off_out,
> +				 unsigned int nbytes, int splice_flags)
> +{
> +	io_uring_prep_rw(IORING_OP_SPLICE, sqe, fd_out, (void *)off_in,
> +			 nbytes, off_out);
> +	sqe->splice_fd_in = fd_in;
> +	sqe->splice_flags = splice_flags;
> +}
> +
>  static inline void io_uring_prep_readv(struct io_uring_sqe *sqe, int fd,
>  				       const struct iovec *iovecs,
>  				       unsigned nr_vecs, off_t offset)
> diff --git a/src/include/liburing/io_uring.h b/src/include/liburing/io_uring.h
> index 424fb4b..dc78697 100644
> --- a/src/include/liburing/io_uring.h
> +++ b/src/include/liburing/io_uring.h
> @@ -23,7 +23,10 @@ struct io_uring_sqe {
>  		__u64	off;	/* offset into file */
>  		__u64	addr2;
>  	};
> -	__u64	addr;		/* pointer to buffer or iovecs */
> +	union {
> +		__u64	addr;	/* pointer to buffer or iovecs */
> +		__u64	off_in;
> +	};
>  	__u32	len;		/* buffer size or number of iovecs */
>  	union {
>  		__kernel_rwf_t	rw_flags;
> @@ -37,6 +40,7 @@ struct io_uring_sqe {
>  		__u32		open_flags;
>  		__u32		statx_flags;
>  		__u32		fadvise_advice;
> +		__u32		splice_flags;
>  	};
>  	__u64	user_data;	/* data to be passed back at completion time */
>  	union {
> @@ -45,6 +49,7 @@ struct io_uring_sqe {
>  			__u16	buf_index;
>  			/* personality to use, if used */
>  			__u16	personality;
> +			__u32	splice_fd_in;
>  		};
>  		__u64	__pad2[3];
>  	};
> @@ -113,6 +118,7 @@ enum {
>  	IORING_OP_RECV,
>  	IORING_OP_OPENAT2,
>  	IORING_OP_EPOLL_CTL,
> +	IORING_OP_SPLICE,
>  
>  	/* this goes last, obviously */
>  	IORING_OP_LAST,
> @@ -128,6 +134,12 @@ enum {
>   */
>  #define IORING_TIMEOUT_ABS	(1U << 0)
>  
> +/*
> + * sqe->splice_flags
> + * extends splice(2) flags
> + */
> +#define SPLICE_F_FD_IN_FIXED	(1U << 31) /* the last bit of __u32 */
> +
>  /*
>   * IO completion data structure (Completion Queue Entry)
>   */
> 

-- 
Pavel Begunkov



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