Re: [PATCH v10 01/10] iomap: stash iomap read ctx in the private field of iomap_iter

[Gao Xiang]

On 2025/12/23 09:56, Hongbo Li wrote:
> It's useful to get filesystem-specific information using the
> existing private field in the @iomap_iter passed to iomap_{begin,end}
> for advanced usage for iomap buffered reads, which is much like the
> current iomap DIO.
>
> For example, EROFS needs it to:
>
>   - implement an efficient page cache sharing feature, since iomap
>     needs to apply to anon inode page cache but we'd like to get the
>     backing inode/fs instead, so filesystem-specific private data is
>     needed to keep such information;
>
>   - pass in both struct page * and void * for inline data to avoid
>     kmap_to_page() usage (which is bogus).
>
> Signed-off-by: Hongbo Li <lihongbo22@xxxxxxxxxx>

Reviewed-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>

Thanks,
Gao Xiang