----- 原始邮件 -----
> 发件人: "Zorro Lang" <zlang@xxxxxxxxxx>
> 收件人: "Jianhong.Yin" <yin-jianhong@xxxxxxx>
> 抄送: linux-xfs@xxxxxxxxxxxxxxx, jiyin@xxxxxxxxxx
> 发送时间: 星期四, 2019年 9 月 05日 下午 2:01:32
> 主题: Re: [PATCH 2/2] xfsprogs: copy_range: let = (src_size - src_offset) if len omitted
>
> On Thu, Sep 05, 2019 at 01:31:52PM +0800, Jianhong.Yin wrote:
> > add update man page.
> >
> > Signed-off-by: Jianhong Yin <yin-jianhong@xxxxxxx>
> > ---
>
> I think these can be in one patch, but anyway...
>
> > io/copy_file_range.c | 7 +++++--
> > man/man8/xfs_io.8 | 9 +++------
> > 2 files changed, 8 insertions(+), 8 deletions(-)
> >
> > diff --git a/io/copy_file_range.c b/io/copy_file_range.c
> > index 283f5094..02d50e53 100644
> > --- a/io/copy_file_range.c
> > +++ b/io/copy_file_range.c
> > @@ -72,6 +72,7 @@ copy_range_f(int argc, char **argv)
> > long long src = 0;
> > long long dst = 0;
> > size_t len = 0;
> > + int len_ommited = 1;
> > int opt;
> > int ret;
> > int fd;
> > @@ -103,6 +104,7 @@ copy_range_f(int argc, char **argv)
> > printf(_("invalid length -- %s\n"), optarg);
> > return 0;
> > }
> > + len_ommited = 0;
> > break;
> > case 'f':
> > src_file_nr = atoi(argv[1]);
> > @@ -128,7 +130,7 @@ copy_range_f(int argc, char **argv)
> > fd = filetable[src_file_nr].fd;
> > }
> >
> > - if (src == 0 && dst == 0 && len == 0) {
> > + if (len_ommited) {
> > off64_t sz;
> >
> > sz = copy_src_filesize(fd);
> > @@ -136,7 +138,8 @@ copy_range_f(int argc, char **argv)
> > ret = 1;
> > goto out;
> > }
> > - len = sz;
> > + if (sz > src)
> > + len = sz - src;
>
> What about file size < offset?
just keep the default value 0,
because QE/tester might want to see what happen
when give an offset(> fsize) to copy_file_range()
#note: This tool was made for test/debug copy_file_range()
Jianhong
>
> Maybe we can do like this?:
>
> sz = copy_src_filesize(fd);
> if (sz < 0 || (unsigned long long)sz > SIZE_MAX || sz < src) {
> ret = 1;
> goto out;
> }
> len = sz - src;
>
> Thanks,
> Zorro
>
> > }
> >
> > ret = copy_file_range_cmd(fd, &src, &dst, len);
> > diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
> > index 6e064bdd..f5f1c4fc 100644
> > --- a/man/man8/xfs_io.8
> > +++ b/man/man8/xfs_io.8
> > @@ -669,13 +669,10 @@ The source must be specified either by path
> > or as another open file
> > .RB ( \-f ).
> > If
> > -.I src_file
> > -.IR src_offset ,
> > -.IR dst_offset ,
> > -and
> > .I length
> > -are omitted the contents of src_file will be copied to the beginning of
> > the
> > -open file, overwriting any data already there.
> > +is omitted will use
> > +.I src_file
> > +(file size - src_offset) instead.
> > .RS 1.0i
> > .PD 0
> > .TP 0.4i
> > --
> > 2.21.0
> >
>
