Re: [PATCH 1/5] btrfs: prepare subpage.c for larger folios support

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

在 2025/2/21 22:36, Johannes Thumshirn 写道:
> On 20.02.25 10:24, Qu Wenruo wrote:
>> For the future of larger folio support, even if block size == page size,
>> we may still hit a larger folio and need to attach a subpage structure to
>> that larger folio.
>>
>> In that case we can no longer assume we need to go subpage routine only
>> when block size < page size, but take folio size into the consideration.
>>
>> Prepare for such future by:
>>
>> - Use folio_size() instead of PAGE_SIZE
>> - Make btrfs_alloc_subpage() to handle different folio sizes
>> - Make btrfs_is_subpage() to do the check based on the folio
>
> I personally would split this patch in 3 doing the above. Or at least
> split out the brtfs_is_subpage() part in another patch.
>

Sure, and the next update will only be sent after all the dependency got
merged into for-next branch.

Thanks,
Qu