fs: warn in case userspace lied about modprobe return

[mirror_ubuntu-bionic-kernel.git] / fs / filesystems.c

diff --git a/fs/filesystems.c b/fs/filesystems.c
index cac75547d35ccb163a6ce0e94c786c1fd150e5db..8b99955e3504e2e8725ff4f4394b84898e88d155 100644 (file)
--- a/fs/filesystems.c
+++ b/fs/filesystems.c
@@ -275,8 +275,10 @@ struct file_system_type *get_fs_type(const char *name)
        int len = dot ? dot - name : strlen(name);
 
        fs = __get_fs_type(name, len);
-       if (!fs && (request_module("fs-%.*s", len, name) == 0))
+       if (!fs && (request_module("fs-%.*s", len, name) == 0)) {
                fs = __get_fs_type(name, len);
+               WARN_ONCE(!fs, "request_module fs-%.*s succeeded, but still no fs?\n", len, name);
+       }
 
        if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) {
                put_filesystem(fs);