fuse: convert fuse_retrieve to use folios

We're just looking for pages in a mapping, use a folio and the folio
lookup function directly instead of using the page helper.

Reviewed-by: Joanne Koong <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>

Author: josefbacik

fs/fuse/dev.c

@@ -1756,15 +1756,15 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
 	index = outarg->offset >> PAGE_SHIFT;
 
 	while (num && ap->num_pages < num_pages) {
-		struct page *page;
+		struct folio *folio;
 		unsigned int this_num;
 
-		page = find_get_page(mapping, index);
-		if (!page)
+		folio = filemap_get_folio(mapping, index);
+		if (IS_ERR(folio))
 			break;
 
 		this_num = min_t(unsigned, num, PAGE_SIZE - offset);
-		ap->pages[ap->num_pages] = page;
+		ap->pages[ap->num_pages] = &folio->page;
 		ap->descs[ap->num_pages].offset = offset;
 		ap->descs[ap->num_pages].length = this_num;
 		ap->num_pages++;