btrfs: convert try_release_extent_buffer() to take a folio

The old page API is being gradually replaced and converted to use folio
to improve code readability and avoid repeated conversion between page
and folio.
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -525,7 +525,7 @@ static bool btree_release_folio(struct folio *folio, gfp_t gfp_flags)
 	if (folio_test_writeback(folio) || folio_test_dirty(folio))
 		return false;
 
-	return try_release_extent_buffer(&folio->page);
+	return try_release_extent_buffer(folio);
 }
 
 static void btree_invalidate_folio(struct folio *folio, size_t offset,

fs/btrfs/extent_io.c

@@ -4147,21 +4147,20 @@ static int try_release_subpage_extent_buffer(struct folio *folio)
 
 }
 
-int try_release_extent_buffer(struct page *page)
+int try_release_extent_buffer(struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
 	struct extent_buffer *eb;
 
-	if (page_to_fs_info(page)->nodesize < PAGE_SIZE)
-		return try_release_subpage_extent_buffer(page_folio(page));
+	if (folio_to_fs_info(folio)->nodesize < PAGE_SIZE)
+		return try_release_subpage_extent_buffer(folio);
 
 	/*
 	 * We need to make sure nobody is changing folio private, as we rely on
 	 * folio private as the pointer to extent buffer.
 	 */
-	spin_lock(&page->mapping->i_private_lock);
+	spin_lock(&folio->mapping->i_private_lock);
 	if (!folio_test_private(folio)) {
-		spin_unlock(&page->mapping->i_private_lock);
+		spin_unlock(&folio->mapping->i_private_lock);
 		return 1;
 	}
 
@@ -4176,10 +4175,10 @@ int try_release_extent_buffer(struct page *page)
 	spin_lock(&eb->refs_lock);
 	if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) {
 		spin_unlock(&eb->refs_lock);
-		spin_unlock(&page->mapping->i_private_lock);
+		spin_unlock(&folio->mapping->i_private_lock);
 		return 0;
 	}
-	spin_unlock(&page->mapping->i_private_lock);
+	spin_unlock(&folio->mapping->i_private_lock);
 
 	/*
 	 * If tree ref isn't set then we know the ref on this eb is a real ref,

fs/btrfs/extent_io.h

@@ -237,7 +237,7 @@ static inline void extent_changeset_free(struct extent_changeset *changeset)
 }
 
 bool try_release_extent_mapping(struct page *page, gfp_t mask);
-int try_release_extent_buffer(struct page *page);
+int try_release_extent_buffer(struct folio *folio);
 
 int btrfs_read_folio(struct file *file, struct folio *folio);
 void extent_write_locked_range(struct inode *inode, const struct folio *locked_folio,