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Message-ID: <20101017004515.GB1614@infradead.org>
Date: Sat, 16 Oct 2010 20:45:15 -0400
From: Christoph Hellwig <hch@...radead.org>
To: Nick Piggin <npiggin@...nel.dk>
Cc: Christoph Hellwig <hch@...radead.org>,
Dave Chinner <david@...morbit.com>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/18] fs: Introduce per-bucket inode hash locks
On Sun, Oct 17, 2010 at 04:12:13AM +1100, Nick Piggin wrote:
> > With the changes Dave implemented based on my suggestions we now have
> > an abstract locked hash list data type. It has the normal hash list
> > operations plus lock/unlock operations.
>
> That's ugly. It just hides the locking. If a bit of casting bothers
> you then put it in a function where it is used like I did.
Exposing the implementation details of which bit of a pointer can
be used as lock when cast to an unsigned long to every user of an
abstract type is what I would consider ugly, and on similar issues
I've certainly not been the only one.
> > So if e.g. the -rt folks need
> > real locks in there there is one single place they need to touch
> > instead of every user. Similarly if we want to add lockdep support
> > there is just one place to touch.
>
> It's unnecessary.
What, lockdep support?
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