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SubjectRe: [PATCH 00/13] cross rename v4
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On Thu, Feb 13, 2014 at 7:29 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Thu, Feb 13, 2014 at 9:28 AM, Miklos Szeredi <miklos@szeredi.hu> wrote:
>>>
>>> I would suggest that whiteouts appear as otherwise negative dentries and that
>>> they don't appear in getdents().
>>
>> I'd argue that this is an administration nightmare. E.g. what if the
>> a backup needs to be made of the rw layer?
>
> The major issue is user space support.
>
> So what do others that support this do? Looking at the gitweb for
> ls.c in coreutils, we find:
>
> http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=blob;f=src/ls.c
>
> # ifdef DT_WHT
> case DT_WHT: type = whiteout; break;
> # endif
>
> so that's presumably what we should use.

Fair enough, that allows the thing to be listed, at least.

What about creation? A new syscall?

Removal? unlink(2)?

Should stat(2) succeed with a new filetype?

Thanks,
Miklos


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