btrfs: migrate extent_buffer::pages[] to folio

For now extent_buffer::pages[] are still only accepting single page
pointer, thus we can migrate to folios pretty easily.

As for single page, page and folio are 1:1 mapped, including their page
flags.

This patch would just do the conversion from struct page to struct
folio, providing the first step to higher order folio in the future.

This conversion is pretty simple:

- extent_buffer::pages[] -> extent_buffer::folios[]

- page_address(eb->pages[i]) -> folio_address(eb->pages[i])

- eb->pages[i] -> folio_page(eb->folios[i], 0)

There would be more specific cleanups preparing for the incoming higher
order folio support.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 137c4eb24c28..e6c535cf3749 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -832,7 +832,7 @@ int btrfs_bin_search(struct extent_buffer *eb, int first_slot,
 
 		if (oip + key_size <= PAGE_SIZE) {
 			const unsigned long idx = get_eb_page_index(offset);
-			char *kaddr = page_address(eb->pages[idx]);
+			char *kaddr = folio_address(eb->folios[idx]);
 
 			oip = get_eb_offset_in_page(eb, offset);
 			tmp = (struct btrfs_disk_key *)(kaddr + oip);