linux-kernel - Re: [PATCH 1/7] BTRFS: Fix lseek return value for error

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Date:	Sun, 18 Sep 2011 10:42:37 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	jeff.liu@...cle.com
CC:	Andi Kleen <ak@...ux.intel.com>,
	Andreas Dilger <adilger@...ger.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>
Subject: Re: [PATCH 1/7] BTRFS: Fix lseek return value for error

Il 18/09/2011 09:29, Jeff Liu ha scritto:
> Hi Andreas and Andi,
>
> Thanks for your comments.
>
> On 09/18/2011 09:46 AM, Andi Kleen wrote:
>
>>>> with an additional improvement if the offset is larger or equal to the
>>>> file size, return -ENXIO in directly:
>>>>
>>>>                 if (offset>= inode->i_size) {
>>>>                         mutex_unlock(&inode->i_mutex);
>>>>                         return -ENXIO;
>>>>                 }
>>>
>>> Except that is wrong, because it would then be impossible to write sparse files.
>
> Per my tryout, except that, if the offset>= source file size, call
> lseek(fd, offset, SEEK_DATA/SEEK_HOLE) against Btrfs will always return
> the total file size rather than -ENXIO.  however, our desired result it
> -ENXIO in this case, Am I right?
>

Yes, ENXIO should be the operation result.
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