linux-ext4 - Re: [PATCH 07/11] ext4: serialize unlocked dio reads with truncate

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Message-ID: <87626xawaz.fsf@openvz.org>
Date:	Sat, 29 Sep 2012 15:43:48 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, jack@...e.cz, lczerner@...hat.com
Subject: Re: [PATCH 07/11] ext4: serialize unlocked dio reads with truncate

On Sat, 29 Sep 2012 00:49:04 -0400, "Theodore Ts'o" <tytso@....edu> wrote:
> On Fri, Sep 28, 2012 at 07:44:07PM +0400, Dmitry Monakhov wrote:
> >  	if (attr->ia_valid & ATTR_SIZE) {
> > -		if (attr->ia_size != i_size_read(inode))
> > +		if (attr->ia_size != inode->i_size) {
> 
> Why this change?   Why are you not using i_size_read() here?
Since we hold i_mutex no one is able to change i_size, and it
is safe to access it directly.
> 
>     	 	       	       	   - Ted
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