No MFS in -current

[Geoff Wing <gcw%pobox.com@localhost>]

# mount_mfs mfs /tmp
...
vu_specnode is NULL.
...
(gdb) bt
#0  0xc036bdcd in cpu_reboot (howto=256, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:952
#1  0xc02dee57 in panic (fmt=0xc051c1eb "trap")
    at ../../../../kern/subr_prf.c:230
#2  0xc036fc8f in trap (frame=0xcdca5a74)
    at ../../../../arch/i386/i386/trap.c:372
#3  0xc010ce7f in calltrap ()
#4  0xc0229923 in ffs_mountfs (devvp=0xcdc9e8a4, mp=0xc3030000, l=0xcdc9cc00)
    at ../../../../ufs/ffs/ffs_vfsops.c:734
#5  0xc024ca28 in mfs_mount (mp=0xc3030000, 
    path=0xbfbfff56 <Address 0xbfbfff56 out of bounds>, data=0xc2f9e400, 
    data_len=0xcdca5cd0) at ../../../../ufs/mfs/mfs_vfsops.c:325
#6  0xc031781b in VFS_MOUNT (mp=0xc3030000, 
    a=0xbfbfff56 <Address 0xbfbfff56 out of bounds>, b=0xc2f9e400, 
    c=0xcdca5cd0) at ../../../../kern/vfs_subr2.c:1003
#7  0xc031e7e4 in do_sys_mount (l=0xcdc9cc00, vfsops=0xc055bec0, 
    type=0x8051122 <Address 0x8051122 out of bounds>, 
    path=0xbfbfff56 <Address 0xbfbfff56 out of bounds>, flags=64, 
    data=0xbfbfecd0, data_seg=UIO_USERSPACE, data_len=120, retval=0xcdca5d28)
    at ../../../../kern/vfs_syscalls.c:329
#8  0xc031e997 in sys___mount50 (l=0xcdc9cc00, uap=0xcdca5d00, 
    retval=0xcdca5d28) at ../../../../kern/vfs_syscalls.c:426
#9  0xc036f6ab in syscall (frame=0xcdca5d48)
    at ../../../../arch/i386/i386/syscall.c:117
#10 0xc010054d in syscall1 ()
(gdb) up 4
#4  0xc0229923 in ffs_mountfs (devvp=0xcdc9e8a4, mp=0xc3030000, l=0xcdc9cc00)
    at ../../../../ufs/ffs/ffs_vfsops.c:734
734             dev = devvp->v_rdev;
(gdb) p *devvp
$1 = {v_uobj = {vmobjlock = {u = {mtxa_owner = 0}}, pgops = 0xc04709c0, 
    memq = {tqh_first = 0x0, tqh_last = 0xcdc9e8ac}, uo_npages = 0, 
    uo_refs = 1}, v_cv = {cv_wmesg = 0xc0513c92 "vnode", cv_waiters = 0}, 
  v_size = -1, v_writesize = -1, v_iflag = 0, v_vflag = 0, v_uflag = 0, 
  v_numoutput = 0, v_writecount = 0, v_holdcnt = 0, v_synclist_slot = 0, 
  v_mount = 0x0, v_op = 0xc2c9d000, v_freelist = {tqe_next = 0x0, 
    tqe_prev = 0x0}, v_freelisthd = 0x0, v_mntvnodes = {tqe_next = 0x0, 
    tqe_prev = 0x0}, v_cleanblkhd = {lh_first = 0x0}, v_dirtyblkhd = {
    lh_first = 0x0}, v_synclist = {tqe_next = 0x0, tqe_prev = 0x0}, 
  v_dnclist = {lh_first = 0x0}, v_nclist = {lh_first = 0x0}, v_un = {
    vu_mountedhere = 0x0, vu_socket = 0x0, vu_specnode = 0x0, 
    vu_fifoinfo = 0x0, vu_ractx = 0x0}, v_type = VBLK, v_tag = VT_MFS, 
  v_lock = {lk_flags = 0, lk_sharecount = 0, lk_interlock = {u = {
        mtxa_owner = 0}}, lk_exclusivecount = 0, lk_recurselevel = 0, 
    lk_waitcount = 0, lk_wmesg = 0xc0512e33 "vnlock", lk_lockholder = -1, 
    lk_locklwp = 0, lk_prio = 20, lk_timo = 0, lk_lock_addr = 0, 
    lk_unlock_addr = 0}, v_vnlock = 0xcdc9e930, v_data = 0xc2e8cca0, 
  v_klist = {slh_first = 0x0}}
(gdb)