erofs: remove the mapping parameter from erofs_try_to_free_cached_page()

The mapping is not used at all, remove it and update related code.

Link: https://lore.kernel.org/r/20210810072416.1392-1-zbestahu@gmail.comReviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

fs/erofs/internal.h

@@ -445,8 +445,7 @@ int __init z_erofs_init_zip_subsystem(void);
 void z_erofs_exit_zip_subsystem(void);
 int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
 				       struct erofs_workgroup *egrp);
-int erofs_try_to_free_cached_page(struct address_space *mapping,
-				  struct page *page);
+int erofs_try_to_free_cached_page(struct page *page);
 int z_erofs_load_lz4_config(struct super_block *sb,
 			    struct erofs_super_block *dsb,
 			    struct z_erofs_lz4_cfgs *lz4, int len);

fs/erofs/super.c

@@ -474,7 +474,7 @@ static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask)
 	DBG_BUGON(mapping->a_ops != &managed_cache_aops);
 
 	if (PagePrivate(page))
-		ret = erofs_try_to_free_cached_page(mapping, page);
+		ret = erofs_try_to_free_cached_page(page);
 
 	return ret;
 }

fs/erofs/zdata.c

@@ -336,8 +336,7 @@ int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
 	return 0;
 }
 
-int erofs_try_to_free_cached_page(struct address_space *mapping,
-				  struct page *page)
+int erofs_try_to_free_cached_page(struct page *page)
 {
 	struct z_erofs_pcluster *const pcl = (void *)page_private(page);
 	int ret = 0;	/* 0 - busy */