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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