linux-kernel - Re: [PATCH] f2fs_io: add lseek command to execute lseek()

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Date: Thu, 15 Feb 2024 12:39:06 -0800
From: Daeho Jeong <daeho43@...il.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, 
	kernel-team@...roid.com, Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [PATCH] f2fs_io: add lseek command to execute lseek()

On Thu, Feb 15, 2024 at 12:36 PM Jaegeuk Kim <jaegeuk@...nel.org> wrote:
>
> On 02/15, Daeho Jeong wrote:
> > From: Daeho Jeong <daehojeong@...gle.com>
> >
> > Added lseek command to support lseek() for SEEK_DATA and SEEK_HOLE.
> >
> > Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> > ---
> >  tools/f2fs_io/f2fs_io.c | 38 ++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 38 insertions(+)
> >
> > diff --git a/tools/f2fs_io/f2fs_io.c b/tools/f2fs_io/f2fs_io.c
> > index e7d286a..b5c5b97 100644
> > --- a/tools/f2fs_io/f2fs_io.c
> > +++ b/tools/f2fs_io/f2fs_io.c
> > @@ -1630,6 +1630,43 @@ static void do_removexattr(int argc, char **argv, const struct cmd_desc *cmd)
> >       exit(0);
> >  }
> >
> > +#define lseek_desc "do lseek for SEEK_DATA or SEEK_HOLE for a file"
> > +#define lseek_help                                   \
> > +"f2fs_io lseek [whence] [offset] [file_path]\n\n"    \
> > +"Do lseek file data in file_path\n"                  \
> > +"whence can be\n"                                    \
>
> Can we also have all the other options as well?

Sounds good.

>
> > +"  data     : SEEK_DATA, return the file offset to the next data location from offset\n"\
> > +"  hole     : SEEK_HOLE, return the file offset to the next hole from offset\n"
> > +
> > +static void do_lseek(int argc, char **argv, const struct cmd_desc *cmd)
> > +{
> > +     int fd, whence;
> > +     off_t offset, ret;
> > +
> > +     if (argc != 4) {
> > +             fputs("Excess arguments\n\n", stderr);
> > +             fputs(cmd->cmd_help, stderr);
> > +             exit(1);
> > +     }
> > +
> > +     offset = atoi(argv[2]);
> > +
> > +     if (!strcmp(argv[1], "data"))
> > +             whence = SEEK_DATA;
> > +     else if (!strcmp(argv[1], "hole"))
> > +             whence = SEEK_HOLE;
> > +     else
> > +             die("Wrong whence type");
> > +
> > +     fd = xopen(argv[3], O_RDONLY, 0);
> > +
> > +     ret = lseek(fd, offset, whence);
> > +     if (ret < 0)
> > +             die_errno("lseek failed");
> > +     printf("returned offset=%ld\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 }
> > @@ -1671,6 +1708,7 @@ const struct cmd_desc cmd_list[] = {
> >       CMD(listxattr),
> >       CMD(setxattr),
> >       CMD(removexattr),
> > +     CMD(lseek),
> >       { NULL, NULL, NULL, NULL, 0 }
> >  };
> >
> > --
> > 2.43.0.687.g38aa6559b0-goog
> >