Auto-mounter

[John Gilmour]

In article <1991Mar29.210846.21818 at jarvis.csri.toronto.edu>, cks at hawkwind.utcs.toronto.edu (Chris Siebenmann) writes:
> jag at cs.mu.oz.au (John Gilmour) writes:
> [...]
> | If you run it on a MIPS machine you'll need to rebuild your kernel 
> | with a fixed nfs_subr.o module. 4.0 and 4.1 versions are available
> | from dip.cs.wisc.edu.
> 
>  Does anyone know what the fix consists of? We're source licensed, and
> I'd much rather patch the source rather than run with a binary object
> file I can't regenerate or modify further if I need to.
> 



>From owner-amd-workers%acl%LANL.GOV at munnari.cs.mu.oz Thu Oct 25 07:25:19 1990
From: cole%cs.wisc.edu at munnari.oz (Bruce Cole)
Received: by dip.cs.wisc.edu; Wed, 24 Oct 90 15:33:15 -0500
To: amd-workers%acl at LANL.GOV
Subject: The reason why amd has problems on Ultrix MIPS processors
Status: O

     In /usr/include/fs/nfs/nfs.h, the structure declaration for NFS file
handles (fhandle_t) is incorrect.  This causes sizeof(struct fhandle_t) to
yield 36 instead of the proper size (32).  The Ultrix kernel code that handles
the caching of NFS file handles depends upon this size and because of the
mis-declaration, it breaks when amd is used.
     Fixing this problem fixes the mount point traversing behavior under 
Ultrix.

Workarounds:

     For Ultrix 3.1, change the rfind() routine in sys/fs/nfs/nfs_subr.c to
use the proper file handle size.

*** /tmp/,RCSt1a09412   Wed Oct 24 15:14:09 1990
--- /tmp/,RCSt2a09412   Wed Oct 24 15:14:14 1990
***************
*** 748,754 ****
--- 748,760 ----
        for (gp = ih->gh_chain[0]; gp != (struct gnode *)ih; gp = gp->g_forw) {
                if (gno == gp->g_number && fsid == gp->g_dev) {

+ #ifdef UW
+                       /* For the MIPS architecture, sizeof(*fh) = 36,
+                          instead of the expected 32. */
+                       if (bcmp(vtofh((struct vnode *)gp), fh, NFS_FHSIZE)) {
+ #else
                        if (bcmp(vtofh((struct vnode *)gp), fh, sizeof(*fh))) {
+ #endif UW
  if (cachedebug) printf("rfind: rejected stale gnode, #%d, 0x%x\n",
  gp->g_number, gp);
                                continue;

For Ultrix 4.0, make the equivalent change to the nfs_match() routine in
sys/fs/nfs/nfs_subr.c:

*** /tmp/,RCSt1a09579   Wed Oct 24 15:27:21 1990
--- nfs_subr.c  Wed Oct 24 15:25:25 1990
***************
*** 607,613 ****
--- 607,619 ----
        struct rnode_data *rdp;
  {
        return(!bcmp(vtofh((struct vnode *)gp), rdp->rn_fh,
+ #ifdef UW
+                    /* For the MIPS architecture, sizeof(*fh) = 36,
+                       instead of the expected 32. */
+                    NFS_FHSIZE));
+ #else
                sizeof(fhandle_t)));
+ #endif UW
  }