fix ufs_get_locked_folio() breakage

Al Viro · Al Viro · commit 485053bb81c8 · 2023-12-13T11:14:09.000-05:00
filemap_lock_folio() returns ERR_PTR(-ENOENT) if the thing is not in cache - not NULL like find_lock_page() used to. Fixes: 5fb7bd5 "ufs: add ufs_get_locked_folio and ufs_put_locked_folio" Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ufs/util.c b/fs/ufs/util.c
@@ -245,7 +245,7 @@ struct folio *ufs_get_locked_folio(struct address_space *mapping,
 {
 	struct inode *inode = mapping->host;
 	struct folio *folio = filemap_lock_folio(mapping, index);
-	if (!folio) {
+	if (IS_ERR(folio)) {
 		folio = read_mapping_folio(mapping, index, NULL);
 
 		if (IS_ERR(folio)) {

Original file line number	Diff line number	Diff line change
`@@ -245,7 +245,7 @@ struct folio ufs_get_locked_folio(struct address_space mapping,`
`245`	`245`	`{`
`246`	`246`	`struct inode *inode = mapping->host;`
`247`	`247`	`struct folio *folio = filemap_lock_folio(mapping, index);`
`248`		`- if (!folio) {`
	`248`	`+ if (IS_ERR(folio)) {`
`249`	`249`	`folio = read_mapping_folio(mapping, index, NULL);`
`250`	`250`
`251`	`251`	`if (IS_ERR(folio)) {`