stale nfs file handle with exported loopback mounts

DISCUSSION [email protected] 2 participants 2 messages Oct 27, 2007 – Oct 30, 2007

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lore

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lore

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author

2007-10-27 16:13 UTC #0 lore raw

Hello !

with 2.6.22 i`m trying to export loopback mounted iso-images.

this is /etc/exports:

/export *(ro,crossmnt,subtree_check)

in /export, i have loopback mounted iso-images

after mounting on the client side under /mnt (tried one older and one recent system) , i`m getting:

vmhost:/mnt # ls -la
/bin/ls: iso1: Input/output error
/bin/ls: iso2 Input/output error
/bin/ls: iso3: Input/output error
total 10128
drwxrwxrwt 18 root root 270336 Oct 26 08:45 .

drwxrwxrwt  186 root root   20760 Oct 27 17:45 ..
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso1
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso2
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso3

vmhost:/mnt/iso1 # ls
/bin/ls: .: Stale NFS file handle
vmhost:/mnt/iso1 # ls -la
/bin/ls: .: Input/output error

im unsure if i should blame suse here (its an opensuse 10.3 box which seems to have nfs-utils 1.1.0)

does somebody have such setup up and running and can tell his distro / kernel and nfs-utils version ? maybe i change distro then.

any clues what`s going wrong here and how to resolve ?

regards
roland

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Neil Brown

2007-10-30 05:14 UTC #1 lore raw

Quoted 7 lines · On Saturday October 27, [email protected] wrote:

Hello !
with 2.6.22 i`m trying to export loopback mounted iso-images.
this is /etc/exports:
/export *(ro,crossmnt,subtree_check)

I recommend replacing subtree_check with no_subtree_check, but it shouldn't make an important difference in this case.

This should work with nfs-utils 1.1.0 or later. With earlier releases you need to explicitly export the subordinate filesystems too.

Quoted 16 lines

in /export, i have loopback mounted iso-images
after mounting on the client side under /mnt (tried one older and one recent system) , i`m getting:
vmhost:/mnt # ls -la
/bin/ls: iso1: Input/output error
/bin/ls: iso2 Input/output error
/bin/ls: iso3: Input/output error
total 10128
drwxrwxrwt 18 root root 270336 Oct 26 08:45 .
drwxrwxrwt  186 root root   20760 Oct 27 17:45 ..
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso1
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso2
drwxr-xr-x    2 root root   16384 Jan  1  1970 iso3

Quoted 4 lines

vmhost:/mnt/iso1 # ls
/bin/ls: .: Stale NFS file handle
vmhost:/mnt/iso1 # ls -la
/bin/ls: .: Input/output error

It is a little odd that the errors are inconsistent.

Can you find any log messages from mountd in syslog? What do they say?
Also what does
cat /proc/fs/nfsd/exports

on the server show.

Finally, a tcpdump:

tcpdump -s 0 -w /tmp/tcpdump port 2049

while you run the experiment might help.

Quoted 5 lines

im unsure if i should blame suse here (its an opensuse 10.3 box which seems to have nfs-utils 1.1.0)
does somebody have such setup up and running and can tell his distro / kernel and nfs-utils version ? maybe i change distro then.

I doubt that it is a distro-specific thing. As long as you have nfs-utils-1.1.0 it should work. I don't have a 10.3 box set up yet, but it works fine on Debian/unstable for me.

Maybe try adding the "no_root_squash" export option. What does "ls -l /export" on the server show?

NeilBrown