linux-kernel - Re: [RFC PATCH] vfs: add permute operation

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Date:	Wed, 29 May 2013 16:01:49 -0700
From:	Zach Brown <zab@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [RFC PATCH] vfs: add permute operation

> >> +static void sort_parents3(struct dentry **p)
> >> +void sort_parents(struct dentry **p, unsigned *nump)
> >
> > Yikes, that's a bunch of fiddly code.  Is it *really* worth all that to
> > avoid calling the generic sort helpers?
> 
> AFAICS, I cannot make the compare function transitive, e.g.:  A is
> descendant of C but B is unrelated.  Then what should cmp(A, B) and
> cmp(B, C) return?

Ah, of course.  I wasn't reading closely enough.

- z
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