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

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Message-ID: <20101027091252.GE32255@dastard>
Date:	Wed, 27 Oct 2010 20:12:52 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Al Viro <viro@...IV.linux.org.uk>
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 05:40:38AM +0100, Al Viro wrote:
> 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?

vim utf-8 multibyte support that is causing these characters to be
created. e.g.  e<backspace>' results in é. sometimes the resultant
character looks almost identical and so I didn't notice. I haven't
found the magic recipe to turn this off (maxcombine=0 doesn't seem
to stop it) or change the special compose sequence, so I'll keep
looking.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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