[PATCH] xfs: don't return 0 if generic_segment_checks() find nothing to write

[Jeff Liu]

Hi Ben,

On 04/17/2013 02:26 AM, Ben Myers wrote:
> Hey Jeff,
> 
> On Fri, Apr 12, 2013 at 11:48:28PM +0800, Jeff Liu wrote:
>> From: Jie Liu <jeff.liu at oracle.com>
>>
>> At xfs_file_aio_write(), we just return 0 which means a successfully operation if the ocount
>> is evaluated to 0 at generic_segment_checks().  Generally, it'll occurred if the specified
>> write count is 0 from the user space.  However, for example, if the given offset is over the
>> maximum file size limitation although nothing would be written into the file, in this case,
>> the underlying file system should detect this issue and return a proper errno instead.
>> Hence, the beginning pre-checking up against ocount would conceal some real cause and confuse
>> the user space program maybe.
>>
>> To fix it, we can delay the write count verification until xfs_file_aio_write_checks() is done.
> 
> Could you wrap these around 72 columns or so in the future?  Don't worry
> about reposting this one unless something technical comes up.
Sure, I'll take care of the patch format in the future.

Thanks,
-Jeff