Re: [RFC PATCH] vfs: add MNT_NOFOLLOW flag to umount(2)

[Bodo Eggert]

Miklos Szeredi <miklos@xxxxxxxxxx> wrote:

> Additionally, return -EINVAL if an unknown flag is encountered.  This
> makes it possible for the caller to determine if a flag is supported
> or not (at least on kernels with this patch).

There should be a guaranteed-to-be-invalid flag or flag-combination in
order to safely detect this feature.

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