btrfs: refresh add_ra_bio_pages() to indicate it's using folios

The function add_ra_bio_folios() has been utilizing folio interfaces
since c808c1dcb1b2 ("btrfs: convert add_ra_bio_pages() to use only
folios"), but we are still referring to "pages" inside the function name
and all comments.

Furthermore, such folio/page mixing can even be confusing, e.g. the
variable @page_end is very confusing as we're not really referring to
the end of the page, but the end of the folio, especially when we
already have large folio support.

Enhance that function by:

- Rename "page" to "folio" to avoid confusion

- Skip to the folio end if there is already a folio in the page cache
  The existing skip is:

  	cur += folio_size(folio);

  This is incorrect if @cur is not folio size aligned, and can be
  common with large folio support.

  Thankfully this is not going to cause any real bugs, but at most will
  skip some blocks that can be added to readahead.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

0 files changed, 0 insertions, 0 deletions