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out instead of returning an error. (1) This makes the behavior consistent with mount(2). (2) This makes update mounts on the root file system work properly. (3) The explicit checks for MNT_ROOTFS in src/sbin/fsck_ffs/main.c and src/usr.sbin/mountd/mountd.c which were put in to eliminate errors during update mounts on the root file system can be removed. The only place were MNT_ROOTFS can be validly set is inside the kernel, i.e. with vfs_mountroot_try(). Reviewed by: phk MFC after: 3 days