linux-kernel - Re: [PATCH] f2fs_io: support move

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Date:   Fri, 5 May 2023 20:32:58 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yangtao Li <frank.li@...o.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs_io: support move_range command

On 2023/5/4 22:44, Yangtao Li wrote:
> This patch supports a new sub-command 'move_range' in f2fs_io
> to move a range of data blocks from source file to destination
> file via F2FS_IOC_MOVE_RANGE ioctl.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>   man/f2fs_io.8           |  4 ++++
>   tools/f2fs_io/f2fs_io.c | 35 +++++++++++++++++++++++++++++++++++
>   2 files changed, 39 insertions(+)
> 
> diff --git a/man/f2fs_io.8 b/man/f2fs_io.8
> index 13d4bf3..b25f807 100644
> --- a/man/f2fs_io.8
> +++ b/man/f2fs_io.8
> @@ -138,8 +138,12 @@ Trigger filesystem GC
>   .TP
>   \fBcheckpoint\fR \fI[file]\fR
>   Trigger filesystem checkpoint
> +.TP
>   \fBprecache_extents\fR \fI[file]\fR
>   Trigger precache extents
> +.TP
> +\fBmove_range\fR \fI[src_path] [dst_path] [src_start] [dst_start] [length]\fR
> +Move a range of data blocks from source file to destination file
>   .SH AUTHOR
>   This version of
>   .B f2fs_io
> diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
> index ac7b588..d545d8e 100644
> --- a/tools/f2fs_io/f2fs_io.c
> +++ b/tools/f2fs_io/f2fs_io.c
> @@ -1357,6 +1357,40 @@ static void do_precache_extents(int argc, char **argv, const struct cmd_desc *cm
>   	exit(0);
>   }
>   
> +#define move_range_desc "moving a range of data blocks from source file to destination file"
> +#define move_range_help						\
> +"f2fs_io move_range [src_path] [dst_path] [src_start] [dst_start] [length]\n\n"		\

It's better to wrap the long line as below?

#define move_range_help							\
"f2fs_io move_range [src_path] [dst_path] [src_start] [dst_start] "	\
"[length]\n\n"								\

Thanks,

> +"  src_path  : path to source file\n"					\
> +"  dst_path  : path to destination file\n"				\
> +"  src_start : start offset of src file move region, unit: bytes\n"	\
> +"  dst_start : start offset of dst file move region, unit: bytes\n"	\
> +"  length    : size to move\n"						\
> +
> +static void do_move_range(int argc, char **argv, const struct cmd_desc *cmd)
> +{
> +	struct f2fs_move_range range;
> +	int ret, fd;
> +
> +	if (argc != 6) {
> +		fputs("Excess arguments\n\n", stderr);
> +		fputs(cmd->cmd_help, stderr);
> +		exit(1);
> +	}
> +
> +	fd = xopen(argv[1], O_RDWR, 0);
> +	range.dst_fd = xopen(argv[2], O_RDWR | O_CREAT, 0644);
> +	range.pos_in = atoi(argv[3]);
> +	range.pos_out = atoi(argv[4]);
> +	range.len = atoi(argv[5]);
> +
> +	ret = ioctl(fd, F2FS_IOC_MOVE_RANGE, &range);
> +	if (ret < 0)
> +		die_errno("F2FS_IOC_MOVE_RANGE failed");
> +
> +	printf("move range ret=%d\n", ret);
> +	exit(0);
> +}
> +
>   #define CMD_HIDDEN 	0x0001
>   #define CMD(name) { #name, do_##name, name##_desc, name##_help, 0 }
>   #define _CMD(name) { #name, do_##name, NULL, NULL, CMD_HIDDEN }
> @@ -1391,6 +1425,7 @@ const struct cmd_desc cmd_list[] = {
>   	CMD(gc),
>   	CMD(checkpoint),
>   	CMD(precache_extents),
> +	CMD(move_range),
>   	{ NULL, NULL, NULL, NULL, 0 }
>   };
>