linux-kernel - Re: [PATCH 00/13] cross rename v4

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Date:	Thu, 13 Feb 2014 19:56:23 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Howells <dhowells@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Bruce Fields <bfields@...ldses.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Zach Brown <zab@...hat.com>, Jan Kara <jack@...e.cz>,
	Andy Lutomirski <luto@...capital.net>,
	"mszeredi@...e.cz" <mszeredi@...e.cz>
Subject: Re: [PATCH 00/13] cross rename v4

On Thu, Feb 13, 2014 at 7:29 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Feb 13, 2014 at 9:28 AM, Miklos Szeredi <miklos@...redi.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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