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.
-Jeff
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