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

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Message-Id: <1316357705-sup-2667@shiny>
Date:	Sun, 18 Sep 2011 10:55:49 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Jeff liu <jeff.liu@...cle.com>
Cc:	Marco Stornelli <marco.stornelli@...il.com>,
	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

Excerpts from Jeff liu's message of 2011-09-18 06:33:38 -0400:
> 
> 在 2011-9-18，下午4:42， Marco Stornelli 写道：
> 
> > 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.
> 
> Thanks for your kind confirmation.

Thanks everyone, I've put Jeff's last version of this in my queue.

-chris
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