erofs: adapt folios for z_erofs_read_folio()

It's a straight-forward conversion and no logic changes (except that
it renames the corresponding tracepoint.)
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230817083942.103303-1-hsiangkao@linux.alibaba.com

fs/erofs/zdata.c

@@ -1822,17 +1822,16 @@ static void z_erofs_pcluster_readmore(struct z_erofs_decompress_frontend *f,
 
 static int z_erofs_read_folio(struct file *file, struct folio *folio)
 {
-	struct page *page = &folio->page;
-	struct inode *const inode = page->mapping->host;
+	struct inode *const inode = folio->mapping->host;
 	struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
 	struct z_erofs_decompress_frontend f = DECOMPRESS_FRONTEND_INIT(inode);
 	int err;
 
-	trace_erofs_readpage(page, false);
-	f.headoffset = (erofs_off_t)page->index << PAGE_SHIFT;
+	trace_erofs_read_folio(folio, false);
+	f.headoffset = (erofs_off_t)folio->index << PAGE_SHIFT;
 
 	z_erofs_pcluster_readmore(&f, NULL, true);
-	err = z_erofs_do_read_page(&f, page);
+	err = z_erofs_do_read_page(&f, &folio->page);
 	z_erofs_pcluster_readmore(&f, NULL, false);
 	z_erofs_pcluster_end(&f);
 

include/trace/events/erofs.h

@@ -80,11 +80,11 @@ TRACE_EVENT(erofs_fill_inode,
 		  __entry->blkaddr, __entry->ofs)
 );
 
-TRACE_EVENT(erofs_readpage,
+TRACE_EVENT(erofs_read_folio,
 
-	TP_PROTO(struct page *page, bool raw),
+	TP_PROTO(struct folio *folio, bool raw),
 
-	TP_ARGS(page, raw),
+	TP_ARGS(folio, raw),
 
 	TP_STRUCT__entry(
 		__field(dev_t,		dev	)
@@ -96,11 +96,11 @@ TRACE_EVENT(erofs_readpage,
 	),
 
 	TP_fast_assign(
-		__entry->dev	= page->mapping->host->i_sb->s_dev;
-		__entry->nid	= EROFS_I(page->mapping->host)->nid;
-		__entry->dir	= S_ISDIR(page->mapping->host->i_mode);
-		__entry->index	= page->index;
-		__entry->uptodate = PageUptodate(page);
+		__entry->dev	= folio->mapping->host->i_sb->s_dev;
+		__entry->nid	= EROFS_I(folio->mapping->host)->nid;
+		__entry->dir	= S_ISDIR(folio->mapping->host->i_mode);
+		__entry->index	= folio->index;
+		__entry->uptodate = folio_test_uptodate(folio);
 		__entry->raw = raw;
 	),