freevxfs: Convert vxfs_immed to read_folio

This is a "weak" conversion which converts straight back to using pages.
A full conversion should be performed at some point, hopefully by
someone familiar with the filesystem.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

fs/freevxfs/vxfs_immed.c

@@ -38,33 +38,34 @@
 #include "vxfs_inode.h"
 
 
-static int	vxfs_immed_readpage(struct file *, struct page *);
+static int	vxfs_immed_read_folio(struct file *, struct folio *);
 
 /*
  * Address space operations for immed files and directories.
  */
 const struct address_space_operations vxfs_immed_aops = {
-	.readpage =		vxfs_immed_readpage,
+	.read_folio =		vxfs_immed_read_folio,
 };
 
 /**
- * vxfs_immed_readpage - read part of an immed inode into pagecache
+ * vxfs_immed_read_folio - read part of an immed inode into pagecache
  * @file:	file context (unused)
- * @page:	page frame to fill in.
+ * @folio:	folio to fill in.
  *
  * Description:
- *   vxfs_immed_readpage reads a part of the immed area of the
+ *   vxfs_immed_read_folio reads a part of the immed area of the
  *   file that hosts @pp into the pagecache.
  *
  * Returns:
  *   Zero on success, else a negative error code.
  *
  * Locking status:
- *   @page is locked and will be unlocked.
+ *   @folio is locked and will be unlocked.
  */
 static int
-vxfs_immed_readpage(struct file *fp, struct page *pp)
+vxfs_immed_read_folio(struct file *fp, struct folio *folio)
 {
+	struct page *pp = &folio->page;
 	struct vxfs_inode_info	*vip = VXFS_INO(pp->mapping->host);
 	u_int64_t	offset = (u_int64_t)pp->index << PAGE_SHIFT;
 	caddr_t		kaddr;