linux-kernel - Re: [PATCH 5/6] vfs: reorganize do

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Message-ID: <87hax1s069.fsf@tucsk.pomaz.szeredi.hu>
Date:	Tue, 03 Apr 2012 10:13:18 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@...radead.org
Subject: Re: [PATCH 5/6] vfs: reorganize do_lookup

Al Viro <viro@...IV.linux.org.uk> writes:

> On Mon, Mar 26, 2012 at 12:54:23PM +0200, Miklos Szeredi wrote:
>> This also eliminates the weird retry loop, that could, in theory, retry the
>> cached lookup any number of times (very unlikely scenario: needs two parallel
>> do_lookups and d_revalidate always returning zero).
>
> That really needs to be carved into much smaller pieces - the sucker is
> convoluted as hell and there's a lot of codepaths in there with nearly
> zero test coverage.  I've split it up into provably equivalent
> transformations, leading more or less to the state where yours ends up.
> I _think_ I've reconstructed the sequence of changes more or less
> close to what you were doing there, but the next time you have to do
> something of that kind, do not collapse that into a single patch.  It's
> really easier to review step by step...

Okay, but actually what I was doing there is looking at what the code
actually does and realizing that it's equivalent to __lookup_hash(), so
for me it was a single (albeit complex) single step.

But I'll try to keep reviewability in mind.

The do_last() reorganization in the atomic-open series needs to be split
up, I realize.  Do you have any other high level comments about that
series?

Thanks,
Miklos
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