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

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Message-ID: <20120203014533.GT23916@ZenIV.linux.org.uk>
Date:	Fri, 3 Feb 2012 01:45:33 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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:

> After looking a bit more: nlink_t is a f*cking mess.  Almost any code
> using that type kernel-side is broken.  Crap galore:
> 	* sometimes it's 32 bits, sometimes 16, sometimes 64.  Essentially
> at random.
> 	* almost all have it unsigned, except for sparc32, where it's
> signed short [inherited from v7 via SunOS?  BTW, in v6 it used to be even
> funnier - char, which is where ridiculous LINK_MAX == 127 comes from]
> 
> IOW, nlink_t is an attractive nuisance - it's nearly impossible to use in
> a portable way and we are lucky that almost nobody tries to.

Incidentally, why the hell do we have
	typedef __kernel_nlink_t        nlink_t;
anyway?  It's *not* exposed to userland and it's different from the
userland nlink_t (which is unsigned int on 32bit and unsigned long on 64bit).
Why not use __kernel_nlink_t (or explicitly-sized __uNN) in
arch/*/include/asm/stat.h and declare nlink_t kernel-side as __u32?

Why do we have daddr_t, while we are at it?  There is exactly one user -
fs/freevxfs and there we definitely want a fixed-sized type.
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