linux-kernel - Re: [PATCH 4/4] fs: remove inode_lock from iput_final and prune

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Message-ID: <20101027044038.GE19804@ZenIV.linux.org.uk>
Date:	Wed, 27 Oct 2010 05:40:38 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] fs: remove inode_lock from iput_final and
 prune_icache

On Wed, Oct 27, 2010 at 03:23:04PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@...hat.com>
> 
> Now that inode state changes are protected by the inode->i_lock and
> the inode LRU manipulations by the inode_lru_lock, we can remove the
> inode_lock from prune_icache and the initial part of iput_final().
> 
> instead of using the inode_lock to protect the inode during
> iput_final, use the inode->i_lock instead. This protects the inode
> against new references being taken while we change the inode state
> to I_FREEING, as well as preventing prune_icache from grabbing the
> inode while we are manipulating it. Hence we no longer need the
> i???ode_lock in iput_final prior to setting I_FREEING on the inode.
  ^^^^^^^^^^^^

... the hell?  There's more such damage elsewhere in the thread; what's
going on?
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