diff options
| -rw-r--r-- | fs/overlayfs/super.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index ed4b35c9d647..c14c52560fd6 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -499,13 +499,24 @@ static int ovl_parse_param(struct fs_context *fc, struct fs_parameter *param) struct ovl_fs_context *ctx = fc->fs_private; int opt; - /* - * On remount overlayfs has always ignored all mount options no - * matter if malformed or not so for backwards compatibility we - * do the same here. - */ - if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) - return 0; + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { + /* + * On remount overlayfs has always ignored all mount + * options no matter if malformed or not so for + * backwards compatibility we do the same here. + */ + if (fc->oldapi) + return 0; + + /* + * Give us the freedom to allow changing mount options + * with the new mount api in the future. So instead of + * silently ignoring everything we report a proper + * error. This is only visible for users of the new + * mount api. + */ + return invalfc(fc, "No changes allowed in reconfigure"); + } opt = fs_parse(fc, ovl_parameter_spec, param, &result); if (opt < 0) |