linux-kernel - Re: [RFC] st_nlink after rmdir() and rename()

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Date:	Thu, 3 Mar 2011 23:12:34 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] st_nlink after rmdir() and rename()

On Fri, Mar 04, 2011 at 07:26:14AM +0900, OGAWA Hirofumi wrote:
> Linus Torvalds <torvalds@...ux-foundation.org> writes:
> 
> > On Thu, Mar 3, 2011 at 1:37 PM, OGAWA Hirofumi
> > <hirofumi@...l.parknet.co.jp> wrote:
> >>
> >> And I can't only see is why you refuse to make consistent behavior (if
> >> you are saying it). It's why I said if it's _really easy_.
> >
> > The thing is, it really isn't really easy. As mentioned, it's actually
> > impossible on NFS, and it's possibly impossible on other filesystems
> > too.
> 
> I don't know much about NFS though, I imaged the NFS just fill the
> stat.st_nlink to return to userland by 0 if sillyrenamed dentry? (of
> course, I'm not saying let's emulate "i_nlink >= 1" on all
> filesystems. just about i_nlink == 0) I was thinking Al is working for
> it...

No.  I don't really care much about what NFS does with st_nlink.  It might
be possible to fake for directories, but you'll have a hell of a time doing
that accurately for regular files.  Not worth doing.
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