Re: [PATCH v2] fuse: fix premature writetrhough request for large folio

[Jingbo Xu]

Hi Joanne,

On 1/15/26 9:56 AM, Jingbo Xu wrote:
> 
> 
> On 1/15/26 2:41 AM, Joanne Koong wrote:
>> On Wed, Jan 14, 2026 at 4:45 AM Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx> wrote:
>>>
>>> When large folio is enabled and the initial folio offset exceeds
>>> PAGE_SIZE, e.g. the position resides in the second page of a large
>>> folio, after the folio copying the offset (in the page) won't be updated
>>> to 0 even though the expected range is successfully copied until the end
>>> of the folio.  In this case fuse_fill_write_pages() exits prematurelly
>>> before the request has reached the max_write/max_pages limit.
>>>
>>> Fix this by eliminating page offset entirely and use folio offset
>>> instead.
>>>
>>> Fixes: d60a6015e1a2 ("fuse: support large folios for writethrough writes")
>>> Cc: stable@xxxxxxxxxxxxxxx
>>
>> This should not need the stable tag or any backports. The bug cannot
>> trigger until the future patch for turning on large folios lands.
> 
> I think 6.18 stable also needs this fix?
> 

Sorry I got it mixed up.  I remembered that the patch enabling large
folio is along with the whole patch series supporting large folio, but I
missed the fact that it was not merged to mainline.

So the stable tree indeed doesn't need the fix.  Sorry for the noise.  I
will drop the stable CC tag later.

-- 
Thanks,
Jingbo