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

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Message-ID: <CA+55aFxE+v-RpHd1zNdw4COrkXmdT5btuE6Xei4oyeWSzeGHLw@mail.gmail.com>
Date:	Thu, 13 Feb 2014 10:29:19 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
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 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.

                     Linus
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