[PATCH v2] iomap: Support inline data with block size < page size

[Matthew Wilcox]

On Thu, Jul 29, 2021 at 05:54:56AM +0200, Andreas Gruenbacher wrote:
> > -       /* inline data must start page aligned in the file */
> > -       if (WARN_ON_ONCE(offset_in_page(iomap->offset)))
> > -               return -EIO;
> 
> Maybe add a WARN_ON_ONCE(size > PAGE_SIZE - poff) here?

Sure!

> >         if (WARN_ON_ONCE(size > PAGE_SIZE -
> >                          offset_in_page(iomap->inline_data)))
> >                 return -EIO;
> >         if (WARN_ON_ONCE(size > iomap->length))
> >                 return -EIO;
> > -       if (WARN_ON_ONCE(page_has_private(page)))
> > -               return -EIO;
> > +       if (poff > 0)
> > +               iomap_page_create(inode, page);
> >
> > -       addr = kmap_atomic(page);
> > +       addr = kmap_atomic(page) + poff;
> 
> Maybe kmap_local_page?

Heh, I do that later when I convert to folios (there is no
kmap_atomic_folio(), only kmap_local_folio()).  But I can throw that
in here too.