[PATCH 20/30] romfs: Convert romfs_read_folio() to use a folio

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

Remove the conversion back to struct page and use the folio APIs instead
of the page APIs.  It's probably more trouble than it's worth to support
large folios in romfs, so there are still PAGE_SIZE assumptions in
this function.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 fs/romfs/super.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index 2cbb92462074..68758b6fed94 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -101,19 +101,15 @@ static struct inode *romfs_iget(struct super_block *sb, unsigned long pos);
  */
 static int romfs_read_folio(struct file *file, struct folio *folio)
 {
-	struct page *page = &folio->page;
-	struct inode *inode = page->mapping->host;
+	struct inode *inode = folio->mapping->host;
 	loff_t offset, size;
 	unsigned long fillsize, pos;
 	void *buf;
 	int ret;
 
-	buf = kmap(page);
-	if (!buf)
-		return -ENOMEM;
+	buf = kmap_local_folio(folio, 0);
 
-	/* 32 bit warning -- but not for us :) */
-	offset = page_offset(page);
+	offset = folio_pos(folio);
 	size = i_size_read(inode);
 	fillsize = 0;
 	ret = 0;
@@ -125,20 +121,14 @@ static int romfs_read_folio(struct file *file, struct folio *folio)
 
 		ret = romfs_dev_read(inode->i_sb, pos, buf, fillsize);
 		if (ret < 0) {
-			SetPageError(page);
 			fillsize = 0;
 			ret = -EIO;
 		}
 	}
 
-	if (fillsize < PAGE_SIZE)
-		memset(buf + fillsize, 0, PAGE_SIZE - fillsize);
-	if (ret == 0)
-		SetPageUptodate(page);
-
-	flush_dcache_page(page);
-	kunmap(page);
-	unlock_page(page);
+	buf = folio_zero_tail(folio, fillsize, buf);
+	kunmap_local(buf);
+	folio_end_read(folio, ret == 0);
 	return ret;
 }
 
-- 
2.43.0