f2fs: return error of f2fs_lookup

Now we can report an error to f2fs_lookup given by f2fs_find_entry.
Suggested-by: NHe YunLei <heyunlei@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/dir.c

@@ -230,7 +230,7 @@ struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
 
 	err = fscrypt_setup_filename(dir, child, 1, &fname);
 	if (err) {
-		*res_page = ERR_PTR(-ENOMEM);
+		*res_page = ERR_PTR(err);
 		return NULL;
 	}
 

fs/f2fs/namei.c

@@ -287,8 +287,11 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 		return ERR_PTR(-ENAMETOOLONG);
 
 	de = f2fs_find_entry(dir, &dentry->d_name, &page);
-	if (!de)
+	if (!de) {
+		if (IS_ERR(page))
+			return (struct dentry *)page;
 		return d_splice_alias(inode, dentry);
+	}
 
 	ino = le32_to_cpu(de->ino);
 	f2fs_dentry_kunmap(dir, page);