squashfs: pass a folio to squashfs_readpage_fragment()

Remove an access to page->mapping.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>
Cc: Phillip Lougher <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

fs/squashfs/file.c

···
 }
 
 /* Read datablock stored packed inside a fragment (tail-end packed block) */
-static int squashfs_readpage_fragment(struct page *page, int expected)
+static int squashfs_readpage_fragment(struct folio *folio, int expected)
 {
-	struct inode *inode = page->mapping->host;
+	struct inode *inode = folio->mapping->host;
 	struct squashfs_cache_entry *buffer = squashfs_get_fragment(inode->i_sb,
 		squashfs_i(inode)->fragment_block,
 		squashfs_i(inode)->fragment_size);
···
 			squashfs_i(inode)->fragment_block,
 			squashfs_i(inode)->fragment_size);
 	else
-		squashfs_copy_cache(page, buffer, expected,
+		squashfs_copy_cache(&folio->page, buffer, expected,
 			squashfs_i(inode)->fragment_offset);
 
 	squashfs_cache_put(buffer);
···
 		else
 			res = squashfs_readpage_block(&folio->page, block, res, expected);
 	} else
-		res = squashfs_readpage_fragment(&folio->page, expected);
+		res = squashfs_readpage_fragment(folio, expected);
 
 	if (!res)
 		return 0;