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

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Message-ID: <20120206224941.GA20305@dastard>
Date:	Tue, 7 Feb 2012 09:49:41 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Joel Becker <jlbec@...lplan.org>,
	Chris Mason <chris.mason@...cle.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC] killing boilerplate checks in ->link/->mkdir/->rename

On Fri, Feb 03, 2012 at 01:16:12AM +0000, Al Viro wrote:
> On Thu, Feb 02, 2012 at 03:46:06PM -0800, Linus Torvalds wrote:
> > On Thu, Feb 2, 2012 at 1:24 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> 	* WTF is XFS doing with these checks?

It is validating nlink against the maximum supported by the XFS
on-disk format. It was originally limited by what could be reported
to pathconf() on Irix - a signed int.  We have that same problem on
Linux, too, because on 32 bit systems the maximum number of links
that can be reported via pathconf is 2^31....

> 	Note that we have them
> done _twice_ on all paths - explictly from xfs_create(), xfs_link(),
> xfs_rename() and then from xfs_bumplink() called by exactly the same
> set of functions.

Well, that's a bit stupid, isn't it? Trivial to fix, though...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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