btrfs: tests: convert test_find_delalloc() to use folios

This removes the last btrfs callers of find_or_create_page(),
find_lock_page(), SetPageDirty(), ClearPageDirty(), and get_page(), and
15 calls to compound_head(). The folio lookups return an ERR_PTR instead
of NULL, so adjust the error handling.

Update the comments and test messages accordingly.

The test still works in PAGE_SIZE units, which relies on the test inode
never getting large folios, so assert that the folios are order-0 where
that matters.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Tal Zussman <tz2294@columbia.edu>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

0 files changed, 0 insertions, 0 deletions