Re: [PATCH 00/13] cross rename v4

[Miklos Szeredi]

On Thu, Feb 13, 2014 at 7:29 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, Feb 13, 2014 at 9:28 AM, Miklos Szeredi <miklos@xxxxxxxxxx> 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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