linux-kernel - openat(..., AT_UNLINKED) was Re: New copyfile system call

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Message-ID: <20130331183238.GA25751@amd.pavel.ucw.cz>
Date:	Sun, 31 Mar 2013 20:32:38 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
Cc:	Andreas Dilger <adilger@...ger.ca>,
	Jörn Engel <joern@...fs.org>,
	Andy Lutomirski <luto@...capital.net>,
	Zach Brown <zab@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Ric Wheeler <rwheeler@...hat.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chris L. Mason" <clmason@...ionio.com>,
	Christoph Hellwig <hch@...radead.org>,
	Alexander Viro <aviro@...hat.com>,
	"Martin K. Petersen" <mkp@....net>, Hannes Reinecke <hare@...e.de>,
	Joel Becker <jlbec@...lplan.org>
Subject: openat(..., AT_UNLINKED) was Re: New copyfile system call -
 discuss before LSF?


> > > > Hmm. open_deleted_file() will still need to get a directory... so it
> > > > will still need a path. Perhaps open("/foo/bar/mnt", O_DELETED) would
> > > > be acceptable interface?
> > > 
> > > ...and what's the big plan to make this work on anything other than ext4 and btrfs?
> > 
> > Deleted but open files are from original unix, so it should work on
> > anything unixy (minix, ext, ext2, ...).
> 
> minix, ext, ext2... are not under active development and haven't been
> for more than a decade.
> 
> Take a look at how many actively used filesystems out there that have
> some variant of sillyrename(), and explain what you want to do in those
> cases.

Well. Yes, there are non-unix filesystems around. You have to deal
with silly files on them, and this will not be different.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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