linux-kernel - Re: [PATCH 11/18] fs: Introduce per-bucket inode hash locks

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Message-ID: <87iq0za32l.fsf@basil.nowhere.org>
Date:	Mon, 18 Oct 2010 18:16:50 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/18] fs: Introduce per-bucket inode hash locks

Nick Piggin <npiggin@...nel.dk> writes:
>
>> Providing
>> locking wrappers that are exactly what users need so they don't have
>> to care about it is, IMO, the right thing to do.
>
> Hiding the type of lock, and hiding the fact that it sets the low bit?
> I don't agree. We don't have synchronization in our data structures,
> where possible, because it is just restrictive or goes wrong when people
> don't think enough about the locking.

I fully agree. The old skb lists in networking made this mistake
long ago and it was a big problem, until people essentially stopped 
using it (always using __ variants) and it was eventually removed.

Magic locking in data structures is usually a bad idea.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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