Re: [PATCH v3 0/4] allow partial folio write with iomap_folio_state

[Christoph Hellwig]

On Tue, Aug 12, 2025 at 05:15:34PM +0800, alexjlzheng@xxxxxxxxx wrote:
> From: Jinliang Zheng <alexjlzheng@xxxxxxxxxxx>
> 
> With iomap_folio_state, we can identify uptodate states at the block
> level, and a read_folio reading can correctly handle partially
> uptodate folios.
> 
> Therefore, when a partial write occurs, accept the block-aligned
> partial write instead of rejecting the entire write.
> 
> For example, suppose a folio is 2MB, blocksize is 4kB, and the copied
> bytes are 2MB-3kB.

I'd still love to see some explanation of why you are doing this.
Do you have a workload that actually hits this regularly, and where
it makes a difference.  Can you provide numbers to quantify them?