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, 2 insertions, 2 deletions

diff --git a/fs/btrfs/tests/extent-io-tests.c b/fs/btrfs/tests/extent-io-tests.c
index 1cc86af97dc6..25b3349595e0 100644
--- a/fs/btrfs/tests/extent-io-tests.c
+++ b/fs/btrfs/tests/extent-io-tests.c
@@ -652,7 +652,7 @@ static void dump_eb_and_memory_contents(struct extent_buffer *eb, void *memory,
 					const char *test_name)
 {
 	for (int i = 0; i < eb->len; i++) {
-		struct page *page = eb->pages[i >> PAGE_SHIFT];
+		struct page *page = folio_page(eb->folios[i >> PAGE_SHIFT], 0);
 		void *addr = page_address(page) + offset_in_page(i);
 
 		if (memcmp(addr, memory + i, 1) != 0) {
@@ -668,7 +668,7 @@ static int verify_eb_and_memory(struct extent_buffer *eb, void *memory,
 				const char *test_name)
 {
 	for (int i = 0; i < (eb->len >> PAGE_SHIFT); i++) {
-		void *eb_addr = page_address(eb->pages[i]);
+		void *eb_addr = folio_address(eb->folios[i]);
 
 		if (memcmp(memory + (i << PAGE_SHIFT), eb_addr, PAGE_SIZE) != 0) {
 			dump_eb_and_memory_contents(eb, memory, test_name);