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btrfs: migrate to use folio private instead of page private

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As a cleanup and preparation for future folio migration, this patch
would replace all page->private to folio version.  This includes:

- PagePrivate()
  -> folio_test_private()

- page->private
  -> folio_get_private()

- attach_page_private()
  -> folio_attach_private()

- detach_page_private()
  -> folio_detach_private()

Since we're here, also remove the forced cast on page->private, since
it's (void *) already, we don't really need to do the cast.

For now even if we missed some call sites, it won't cause any problem
yet, as we're only using order 0 folio (single page), thus all those
folio/page flags should be synced.

But for the future conversion to utilize higher order folio, the page
<-> folio flag sync is no longer guaranteed, thus we have to migrate to
utilize folio flags.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2023-11-17 14:24:14 +10:30 • committed by David Sterba
commit cfbf07e278
5 changed files with 124 additions and 89 deletions
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