On Sun, 22 Apr 2001, Bruce Evans wrote:
> In FreeBSD, mount privilege is controlled by the vfs.usermount
> sysctl (default: off), so df must still be setgid operator to work
> on devices.
>
> The mount() method is better because can work on work on all types
> of filesystems that the kernel understands, while ufs_df() only
> works for ufs.
>
> [patch]
Although I like the idea of being able to df unmounted, non-ufs
filesystems, I think the tradeoff might be too harsh.
Non-root users aren't allowed to mount(2) at all if vfs.usermount=0,
operator or no operator -- that is, in this case, df would fail for
non-root users.
-Paul.
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