linux-kernel - Re: [patch 1/2] VFS: new fgetattr() file operation

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Message-Id: <E1IZndW-0003uI-00@dorka.pomaz.szeredi.hu>
Date:	Mon, 24 Sep 2007 15:06:06 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	matthew@....cx
CC:	miklos@...redi.hu, hch@...radead.org, trond.myklebust@....uio.no,
	adilger@...sterfs.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [patch 1/2] VFS: new fgetattr() file operation

> > > and if that means adding silly rename support so be it.
> > 
> > That's what is done currently.
> > 
> > But it's has various dawbacks, like rmdir doesn't work if there are
> > open files within an otherwise empty directory.
> > 
> > I'd happily accept suggestions on how to deal with this differenty.
> 
> Only sillyrename files with nlink > 1?  I don't see how attributes can
> change anything for a deleted file.

I don't quite understand your suggestion.

A file isn't deleted while there are still links or open files
refering to it.  So getting the attributes for a file with nlink==0 is
perfectly valid while the file is still open.

If a network filesystem protocol can't handle operations (be it data
or metadata) on an unlinked file, we must do sillirenaming, so that
the file is not actually unlinked.

Miklos
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