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

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Message-ID: <a9fa2da0-91e7-4671-95a6-a0a44c83a92d@linux.alibaba.com>
Date: Thu, 15 Jan 2026 09:56:18 +0800
From: Jingbo Xu <jefflexu@...ux.alibaba.com>
To: Joanne Koong <joannelkoong@...il.com>
Cc: miklos@...redi.hu, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, horst@...thelmer.de,
 joseph.qi@...ux.alibaba.com
Subject: Re: [PATCH v2] fuse: fix premature writetrhough request for large
 folio



On 1/15/26 2:41 AM, Joanne Koong wrote:
> On Wed, Jan 14, 2026 at 4:45 AM Jingbo Xu <jefflexu@...ux.alibaba.com> 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@...r.kernel.org
> 
> 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?

-- 
Thanks,
Jingbo