linux-kernel - Re: [PATCH 09/17] fs: Make last_ino, iunique independent of inode

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Message-ID: <20101001060827.GI32349@infradead.org>
Date:	Fri, 1 Oct 2010 02:08:27 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/17] fs: Make last_ino, iunique independent of
 inode_lock

On Wed, Sep 29, 2010 at 10:18:41PM +1000, Dave Chinner wrote:
> From: Nick Piggin <npiggin@...e.de>
> 
> Before removing the inode_lock, we need to make the last_ino  and iunique
> counters independent of the inode_lock. last_ino can be trivially converted to
> an atomic variable, while the iunique counter needs a new lock nested inside
> the inode_lock to provide the same protection that the inode_lock previously
> provided.

Given that last_ino becomes a per-cpu construct only a few patches later
I think there's no point to make it an atomic_t here - just reorder the
per-cpu patch before the inode_lock removal.

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