[PATCHv3 1/2] block: accumulate segment page gaps per bio

[Christoph Hellwig]

On Tue, Aug 26, 2025 at 07:47:46AM -0600, Keith Busch wrote:
> Currently, the virtual boundary is always compared to bv_offset, which
> is a page offset. If the virtual boundary is larger than a page, then we
> need something like "page_to_phys(bv.bv_page) + bv.bv_offset" every
> place we need to check against the virt boundary.

bv_offset is only guaranteed to be a page offset if your use
bio_for_each_segment(_all) or the low-level helpers implementing
it and not bio_for_each_bvec(_all) where it can be much larger
than PAGE_SIZE.