linux-kernel - Re: [RFC] killing boilerplate checks in ->link/->mkdir/->rename

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Message-ID: <1328297704.2107.3.camel@koala>
Date:	Fri, 03 Feb 2012 21:34:53 +0200
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC] killing boilerplate checks in ->link/->mkdir/->rename

On Fri, 2012-02-03 at 17:08 +0000, Al Viro wrote:
> On Fri, Feb 03, 2012 at 01:16:12AM +0000, Al Viro wrote:
> 
> > 	* ubifs, hfsplus, jffs2 - definitely broken if you create enough
> > links.  i_nlink wraparound to zero, confused inode eviction logics.
> 
> BTW, ubifs plays funny games with i_nlink - decrements it early in
> unlink/rmdir/rename and then increments it back on failure.  *If*
> we really want it that way, we need to use set_nlink() there.  Frankly,
> I'd rather deal with drop_nlink() after the last possible failure
> exit...  Unless there are serious reasons why that wouldn't work, that is.

There was a good reason for those games. I cannot provide a good
explanation right now because I need to refresh my memory (but I am sure
there must be a big comment in the code about this) and my daughter is
getting upset already because I am typing something instead of playing
with her. Will try to answer on Monday. Have a nice weekend!

-- 
Best Regards,
Artem Bityutskiy

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