[PATCH] erofs: apply proper VMA alignment for memory mapped files on THP

[Gao Xiang]

On 2024/3/7 09:07, Chao Yu wrote:
> On 2024/3/6 14:51, Gao Xiang wrote:
>>
>>
>> On 2024/3/6 13:31, Gao Xiang wrote:
>>> There are mainly two reasons that thp_get_unmapped_area() should be
>>> used for EROFS as other filesystems:
>>>
>>>   - It's needed to enable PMD mappings as a FSDAX filesystem, see
>>>     commit 74d2fad1334d ("thp, dax: add thp_get_unmapped_area for pmd
>>>     mappings");
>>>
>>>   - It's useful together with CONFIG_READ_ONLY_THP_FOR_FS which enables
>>>     THPs for read-only mmapped files (e.g. shared libraries) even without
>>>     FSDAX.  See commit 1854bc6e2420 ("mm/readahead: Align file mappings
>>>     for non-DAX").
>>
>> Refine this part as
>>
>>   - It's useful together with large folios and CONFIG_READ_ONLY_THP_FOR_FS
>>     which enable THPs for mmapped files (e.g. shared libraries) even without
>>     ...
>>
>>>
>>> Fixes: 06252e9ce05b ("erofs: dax support for non-tailpacking regular file")
>>
>> Fixes: ce529cc25b18 ("erofs: enable large folios for iomap mode")
>> Fixes: be62c5198861 ("erofs: enable large folios for fscache mode")
>>
>>> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
> 
> Reviewed-by: Chao Yu <chao at kernel.org>

Thanks, added!

Thanks,
Gao Xiang

> 
> Thanks,