linux-kernel - Re: [PATCH 1/2 v2] fs: add SEEK_HOLE and SEEK

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Date:	Thu, 05 May 2011 15:01:20 -0400
From:	Josef Bacik <josef@...hat.com>
To:	Marco Stornelli <marco.stornelli@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 1/2 v2] fs: add SEEK_HOLE and SEEK_DATA flags

On 05/05/2011 02:54 PM, Marco Stornelli wrote:
> Il 04/05/2011 19:58, Josef Bacik ha scritto:
>> + if (offset>= i_size_read(inode)) {
>> + mutex_unlock(&inode->i_mutex);
>> + return -ENXIO;
>> + }
>> + offset = i_size_read(inode);
>> + break;
>
> Here maybe it's possible to use offset bigger than i_size, because
> i_size_read is "atomic" but something can happen between two calls,
> isn't it?
>

We're holding the i_mutex so we are safe, i_size_read is used just for 
consistency sake.  Thanks,

Josef
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