Re: [PATCH v6 3/3] xfs: add support for FALLOC_FL_WRITE_ZEROES

On 6/25/2026 2:12 PM, Christoph Hellwig wrote:
> On Thu, Jun 25, 2026 at 07:16:47PM +0800, Zhang Yi wrote:
>> I've thought about this more and feel that we need to add one more
>> scenario here:
>>
>> 3) If the blocks at the boundaries are in dirty unwritten or in delay
>>     allocated state, it should be handled the same way as scenario 2.
>>     Additionally, before returning, we need to flush these two boundary
>>     blocks that have been partially zeroed, to ensure that after
>>     FALLOC_FL_WRITE_ZEROES, all ranges are in the written state.
>>
>> What do you think?
> 
> Yes.  Can you send an xfstest addition the exercises these corner
> cases?
> 

I have already created one that does a subset of these cases. I will add more
and send it to the list soon!

--
Pankaj