linux-kernel - Re: [RFC][PATCHSET v3] non-recursive pathname resolution & RCU symlinks

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Message-ID: <20150516002003.GM7232@ZenIV.linux.org.uk>
Date:	Sat, 16 May 2015 01:20:03 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Dave Chinner <david@...morbit.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: [RFC][PATCHSET v3] non-recursive pathname resolution & RCU
 symlinks

On Sat, May 16, 2015 at 01:10:27AM +0100, Al Viro wrote:

> Er...  Remember the clusterfuck around the ->i_size and alignment
> checks on XFS DIO writes?  Just this cycle.  Correctness of XFS
> locking is nothing to boast about - it *is* convoluted as hell and you
> guys are not superhuman enough to reliably spot the problems in that nest
> of horrors.  Nobody is.
> 
> PS: I've no idea whether I'm being insulting or not and frankly, I don't give
> a damn; unlike Linus I hadn't signed off on the "code of conflict" nonsense.
> Anyone who feels like complaining is quite welcome to it.

PPS: everyone is also quite welcome to coming up with a sane locking scheme,
and unlike complaints about insulting tone, _that_ won't be ignored.  Folks,
I'm absolutely serious - if anyone has a good candidate (hell, any candidate),
post it on fsdevel and let's discuss it.  I'll do my best to poke holes in
such and if we end up with something working, I'll be bloody happy.
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