ocfs2: Convert ocfs2 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/ocfs2/alloc.c

@@ -7427,7 +7427,7 @@ int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
 	/*
 	 * No need to worry about the data page here - it's been
 	 * truncated already and inline data doesn't need it for
-	 * pushing zero's to disk, so we'll let readpage pick it up
+	 * pushing zero's to disk, so we'll let read_folio pick it up
 	 * later.
 	 */
 	if (trunc) {

fs/ocfs2/aops.c

@@ -275,8 +275,9 @@ static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
 	return ret;
 }
 
-static int ocfs2_readpage(struct file *file, struct page *page)
+static int ocfs2_read_folio(struct file *file, struct folio *folio)
 {
+	struct page *page = &folio->page;
 	struct inode *inode = page->mapping->host;
 	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 	loff_t start = (loff_t)page->index << PAGE_SHIFT;
@@ -2454,7 +2455,7 @@ static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 
 const struct address_space_operations ocfs2_aops = {
 	.dirty_folio		= block_dirty_folio,
-	.readpage		= ocfs2_readpage,
+	.read_folio		= ocfs2_read_folio,
 	.readahead		= ocfs2_readahead,
 	.writepage		= ocfs2_writepage,
 	.write_begin		= ocfs2_write_begin,

fs/ocfs2/file.c

@@ -2526,7 +2526,7 @@ static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
 		return -EOPNOTSUPP;
 
 	/*
-	 * buffered reads protect themselves in ->readpage().  O_DIRECT reads
+	 * buffered reads protect themselves in ->read_folio().  O_DIRECT reads
 	 * need locks to protect pending reads from racing with truncate.
 	 */
 	if (direct_io) {

fs/ocfs2/symlink.c

@@ -52,8 +52,9 @@
 #include "buffer_head_io.h"
 
 
-static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
+static int ocfs2_fast_symlink_read_folio(struct file *f, struct folio *folio)
 {
+	struct page *page = &folio->page;
 	struct inode *inode = page->mapping->host;
 	struct buffer_head *bh = NULL;
 	int status = ocfs2_read_inode_block(inode, &bh);
@@ -81,7 +82,7 @@ static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
 }
 
 const struct address_space_operations ocfs2_fast_symlink_aops = {
-	.readpage		= ocfs2_fast_symlink_readpage,
+	.read_folio		= ocfs2_fast_symlink_read_folio,
 };
 
 const struct inode_operations ocfs2_symlink_inode_operations = {