Patch Name:  PHKL_3682

Patch Description: s700 9.0[357] rcp(1) to named pipe across NFS causes panic

This patch fixes the panic caused by doing rcp to a named pipe file across
NFS.

This has been ported from 9.01 release (PHKL_3652).

The panic is caused while trying to access the corrupted mutiple fifo buffer
list. Previously, the code tried to implement and maintain mutiple fifo buffer
list, in an incorrect way. This caused corruption of data pointers and the
system panicked while trying to follow the links in this corrupt fifo buffer
list.

This patch modified the fifo_rdwr procedure in nfs/fifo_vnops.c to support
only a single fifo buffer (like in 800s) to perform read/write operations
(e.g., on a named pipe) across NFS. Also, the patch removed fifo_buffree and
fifo_bufalloc procedures. It now initializes the fifo structure in fifosp
procedure and frees it in fifo_inactive (both in nfs/fifo_vnops.c).

File modified: nfs/fifo_vnops.c

Path Name:  /hp-ux_patches/s700/9.X/PHKL_3682

Effective Date:  940126

Repost: 94/05/24
        The patch was modified to allow installation on HP-UX 9.05.

Repost: 95/07/20
        The patch was modified to allow installation on HP-UX 9.07.

OS Release:  9.03 9.05 9.07

Reboot Required:  Yes

Patch Files:  
/system/PHKL_3682/new/fifo_vnops.o

SR#:  None

"what" string/timestamp:  
fifo_vnops.o:
         fifo_vnops.c: $Revision: 1.6.61.4 $Date: 1/24/94 $ PATCH_9.03
(PHKL_3682)


"sum" output:  
21217 13 fifo_vnops.o


Dependencies:  None

Supersedes:  None

Patch Package Size:  60 Kbytes

Installation Instructions:  

     Please review all instructions and the Hewlett-Packard
     SupportLine User Guide or your Hewlett-Packard support terms
     and conditions for precautions, scope of license,
     restrictions, and, limitation of liability and warranties,
     before installing this patch.

     Note: Please back up your system before you patch.

---------------------------------------------------------------------------
After getting the patch onto your machine, unshar the patch (sh PHKL_3682).

To install this patch do the following:
1) Run /etc/update (Note: you must be logged in as root to update
   a system).
2) Once in the update "Main Menu" move the highlighted line to "Change
   Source or Destination ->" and press "Return" or "Select Item".
3) Make sure the highlighted item in the "Change Source or Destination"
   window is "From Tape Device to Local System ...", then press "Return" or
   "Select Item".
4) You should now be in the "From Tape Device to Local System" window.
   Change the "Source:  /dev/rmt/0m" to "Source: /tmp/PHKL_3682.updt"
   (this assumes that you are in the /tmp directory where PHKL_3682.updt
   has been placed).  Note: You must enter the complete path name.
5) Press "Done".
6) From here on follow the standard directions for update.

The customized script that update runs will move the original software
to /system/PHKL_3682/orig.  HP recommends keeping this software there in
order to recover from any potential problems.  It is also recommended that
you move the PHKL_3682.text file to /system/PHKL_3682 to be retained for
future reference.

If you wish to put this patch on a magnetic tape and update from the tape
drive, dd a copy of the patch to the tape drive.  As an example the
following will create a copy of the patch that update can read:
dd if=PHKL_3682.updt of=/dev/rmt/0m bs=2048