Re: About a probable 32 bit ino_t bottleneck in cd9660_fhtovp()

["Thomas Schmitt" <scdbackup%gmx.net@localhost>]

Hi,

me:
> >  Is there a tutorial "Localhost NFS for Dummies" ?

Taylor R Campbell:
> Just set up /etc/exports (see `man exports') and get rpcbind, mountd,
> and nfsd running:

I edited /etc/exports and did without final success:

  netbsd# cat /etc/exports
  /mnt/iso -ro localhost
  netbsd# mkdir /mnt/iso
  netbsd# mkdir /mnt/nfs
  netbsd# /etc/rc.d/rpcbind onestart
  Starting rpcbind.
  netbsd# /etc/rc.d/mountd onestart
  Starting mountd.
  netbsd# /etc/rc.d/nfsd onestart
  /etc/rc.d/nfsd: WARNING: $mountd is not enabled.
  netbsd# # mount_nfs localhost
  netbsd# mount_cd9660 /dev/cd0a /mnt/iso
  netbsd# mount_nfs localhost:/mnt/iso /mnt/nfs
  mount_nfs: rpcbind to nfs on server: RPC: Program not registered

  ^C
  netbsd# mount
  /dev/wd0a on / type ffs (local)
  kernfs on /kern type kernfs (local)
  ptyfs on /dev/pts type ptyfs (local)
  procfs on /proc type procfs (local)
  /dev/cd0a on /mnt/iso type cd9660 (read-only, NFS exported, local)

Seems to be known as PR bin/45679.

So it is about "mountd being enabled" ?
  http://www.netbsd.org/docs/guide/en/chap-net-services.html
In /etc/rc.conf
  mountd=YES
Progress
  /etc/rc.d/nfsd: WARNING: $rpcbind is not enabled.
In /etc/rc.conf
  rpcbind=YES
And ...
  netbsd# /etc/rc.d/nfsd onestart
  Starting nfsd.
  netbsd# ps -ax | grep nfs
  12681 ?     Ssl  0:00.00 /usr/sbin/nfsd -6tun 4 
  netbsd# mount_nfs localhost:/mnt/iso /mnt/nfs
  netbsd# mount
  ...
  localhost:/mnt/iso on /mnt/nfs type nfs
  netbsd# tail -5 /var/log/messages
  May 10 20:32:38 netbsd thomas: /etc/rc.d/nfsd: WARNING: $rpcbind is not 
enabled.
  May 10 20:35:05 netbsd /netbsd: cd9660_fhtovp: ifh.ifid_ino = 34445312
  May 10 20:35:05 netbsd /netbsd: RRIP without PX field?
  May 10 20:35:05 netbsd /netbsd: cd9660_fhtovp: ifh.ifid_ino = 34445312
  May 10 20:35:05 netbsd /netbsd: cd9660_fhtovp: ifh.ifid_ino = 34445312

This matches the inode rollover of /bin/ls of 6.1.3:
  netbsd# ls -lid /mnt/iso
  34445312 drwxr-xr-x  1 root  wheel  2048 Feb  4 18:09 /mnt/iso

Whereas with fix for bin/48798:
  netbsd# /usr/src/bin/ls/ls  -lid /mnt/iso
  4329412608 drwxr-xr-x  1 root  wheel  2048 Feb  4 18:09 /mnt/iso

The NFS mountpoint is unusable
  netbsd# ls -l /mnt/nfs
  -r-xr-xr-x  1 root  wheel  0 Jan  1  1970 /mnt/nfs
But it can be unmouted, at least.

Note: This is a more populated ISO image than the published test ISO.
      Thus the inode numbers might slightly differ.

Now it is worth a PR.
kern/48799:
  32 bit ino_t bottleneck in interface of cd9660 to vfsops sabotages NFS

------------------------------------------------------------

Strange forth and back after reboot with enabled rpcbind
and mountd:

  netbsd# /etc/rc.d/nfsd onestart
  Starting nfsd.
  netbsd# mount
  /dev/wd0a on / type ffs (NFS exported, local)
  ...
  /dev/cd0a on /mnt/iso type cd9660 (read-only, local)

The wrong filesystem is exported.

  netbsd# cat /etc/exports
  /mnt/iso -ro localhost
  netbsd# /etc/rc.d/nfsd onestop
  Stopping nfsd.
  netbsd# /etc/rc.d/mountd stop
  Stopping mountd.
  ...
  netbsd# /etc/rc.d/rpcbind stop
  Stopping rpcbind.
  ...
  netbsd# /etc/rc.d/rpcbind onestart
  Starting rpcbind.
  netbsd# mount
  /dev/wd0a on / type ffs (NFS exported, local)

Still wrong.

  netbsd# /etc/rc.d/mountd onestart
  Starting mountd.
  netbsd# mount
  /dev/wd0a on / type ffs (local)
  ...
  /dev/cd0a on /mnt/iso type cd9660 (read-only, NFS exported, local)

Now it is right. Why ?  

Theory:
If the exported directory is empty, then it prefers to export root.
The trouble ends when i mount /mnt/iso, stop the demons, and restart
them.

Is my /etc/exports so weird ?


Have a nice day :)

Thomas