> Why doesn't newfs simply use lseek(2) to find the size of the device/file?

How?  SEEK_END on special devices doesn't work, does it?  Sure doesn't
look as though it ought to:

[kern/vfs_syscalls.c]
        case SEEK_END:
                error = VOP_GETATTR(vp, &vattr, cred, p);
                if (error)
                        goto out;

[miscfs/specfs/spec_vnops.c]
	{ &vop_getattr_desc, spec_getattr },		/* getattr */

[miscfs/specfs/specdev.h]
#define	spec_getattr	genfs_ebadf

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