btrfs: convert insert_inline_extent() to use a folio

We only use a page to copy in the data for the inline extent.  Use a
folio for this instead.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -495,7 +495,6 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
 {
 	struct btrfs_root *root = inode->root;
 	struct extent_buffer *leaf;
-	struct page *page = NULL;
 	const u32 sectorsize = trans->fs_info->sectorsize;
 	char *kaddr;
 	unsigned long ptr;
@@ -555,12 +554,16 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
 		btrfs_set_file_extent_compression(leaf, ei,
 						  compress_type);
 	} else {
-		page = find_get_page(inode->vfs_inode.i_mapping, 0);
+		struct folio *folio;
+
+		folio = __filemap_get_folio(inode->vfs_inode.i_mapping,
+					    0, 0, 0);
+		ASSERT(!IS_ERR(folio));
 		btrfs_set_file_extent_compression(leaf, ei, 0);
-		kaddr = kmap_local_page(page);
+		kaddr = kmap_local_folio(folio, 0);
 		write_extent_buffer(leaf, kaddr, ptr, size);
 		kunmap_local(kaddr);
-		put_page(page);
+		folio_put(folio);
 	}
 	btrfs_mark_buffer_dirty(trans, leaf);
 	btrfs_release_path(path);