Sharing ISO images over NFS Post: 90149

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Special Forums Hardware Filesystems, Disks and Memory Sharing ISO images over NFS Post 90149 by deckard on Saturday 19th of November 2005 02:41:39 AM

11-19-2005

Registered User

Sharing ISO images over NFS

I've got a bunch of application CDs that I use here at home under Wine. They are Windows applications and as such, some of them want to see the volume label in order for the application to run. So... just copying the CD-ROM contents to a directory doesn't work. With that in mind, what I've done in the past is make ISO images of the CD-ROMs on my hard drives and mount them locally. The mounted device is then mapped to "Drive D:" in Wine. This has always worked well. But I wanted to prevent wasting HD space on my clients, so I centralized the ISOs on a server. Until now, I've been using Samba to share those ISOs but seeing that I no longer have any Windows boxes, I've been moving away from Samba and onto NFS. However, I now have a problem. If I mount 'server:/mnt/data/cdserv' on /mnt/data/cdserv on the client, I can see my ISO images. No problem. But when I try to mount one of those ISO images to /mnt/cdrom1. I get a "permission denied" error.

While testing, I tried to manually associate /dev/loop0 with /mnt/data/cdserv/abh12.iso and I got the same "permission denied" error. So it sounds like the process fails when setting up a loop device. What is odd is that iso9660 is a read only file system. I have the NFS server exporting 'ro' and the export is mounted 'ro'. So my guess is that the "permission denied" error is being caused by the loop set up and nothing else. Any ideas why? Do I need to use a special option with losetup if I set the loop device up manually? Or is it an NFS export or mount issue? Is there some aspect of the ISO image that's not getting carried over NFS? This worked very well for me under Samba, but I really don't need Samba anymore and would hate to keep it around for just this one application.

One more thing I just discovered. I created a looped ext2 filesystem image and put it in the same location that my ISOs are. I tried to mount it via nfs as a loop device and got the same "permission denied" error. So it definitely seems that losetup/loop devs don't like to be exported via NFS. I'm still not sure why though since NFS seems to act like a normal filesystem in every other regard. Still searching for an answer...

Last edited by deckard; 11-19-2005 at 04:08 AM..

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LEARN ABOUT OSF1

dxfileshare

dxfileshare(8)						      System Manager's Manual						    dxfileshare(8)

NAME

       dxfileshare - Exports local directories and mounts directories from the network

SYNOPSIS

       /usr/bin/X11/dxfileshare

DESCRIPTION

       Use the File Sharing application, dxfileshare, to: Export (or share) local UNIX directories to the network Stop exporting UNIX local direc-
       tories to the network Specify which directories mounted from the network are to be remounted every time the system is  rebooted,  that  is,
       add  an entry to the /etc/fstab file Add, change, or delete NFS entries from the /etc/exports file Share local UNIX directories with a per-
       sonal computer (PC) when Advanced Server for UNIX is installed on your system Display local directories that are shared (exported) with the
       network Display network mounts (directories that can be mounted from the network)

       The File Sharing application can also be invoked from the CDE Application Manager from the following categories:

       Application Group:	System_Admin
       System Admin Subgroup:	Daily Admin

       Online help is available for the File Sharing application by clicking on any Help button or using the Help pull-down menu.

RESTRICTIONS

       You  must  have root privileges to use certain features of File Sharing.  Namely, the ability to export (or share) a directory or to modify
       the properties of a directory that is already being exported.

       You must have Advanced Server for UNIX installed on your system to share local directories with PCs.

FILES

       Defaults that are shared by the graphical and command line user interface. File Sharing uses the same file as the Host Manager application.
       File  Sharing  application File Sharing help volume Directory containing File Sharing application icons Application defaults file that sets
       the default values for the X resources File Sharing message catalog Message catalog containing File Sharing location IDs for  on-item  help
       i18n_motif_shared_text.cat

	      Message catalog containing application-independent messages i18n_motif_shared_text_LocIds.cat

	      Message catalog containing application-independent location IDs for on-item help

SEE ALSO

       Commands: X(1X), automount(8), bcheckrc(8), mount(8), mountd(8), showmount(8), umount(8)

       Functions: getfsstat(2), getmntinfo(3), getmntinfo_r(3), mount(2), mount(2sv), umount(2), umount(2sv), umount(3)

       Files: exports(4), fstab(4), mountdtab(4)

       Tru64 UNIX System Administration

       ASU Installation and Administration Guide

       ASU Concepts and Planning Guide

																    dxfileshare(8)