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I've got a self-written FUSE file system I mount on my NFS server on mountpoint /export/example/mount. Then I export a parent directory of the FUSE via NFS. The /etc/exports contains the options nohide,crossmnt,subtree_check,ro,no_root_squash and allows free access to everyone:

/export/example *(nohide,crossmnt,subtree_check,ro,no_root_squash)

I can mount this export on my NFS client and access it. As soon as I access the FUSE within the NFS my client hangs until I umount the NFS (and I need to use option -f to accomplish that).

I've tried mounting the FUSE as my working user and as root. The results are the same.

The server is running a Ubuntu 12.04, the client a SuSE 9.3. The FUSE is written in Python and works locally without any trouble. Only the export via NFS fails. I have no security restrictions as all this is on a private network with only trusted users.

Does anybody have an idea what could cause my trouble or (even better) how to solve the issue?

I've thought about replacing the NFS with SSHFS to work around the problem, but that does not work as the client system is too old to support SSHFS (as it is based on FUSE, and FUSE isn't supported).

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migrated from superuser.com Nov 26 '13 at 11:12

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Did you try the allow_other option to sshfs mount? –  skara Apr 12 at 16:37
Yes, I did. To no avail, unfortunately. But in the meantime we switched off the old hardware with the old system, so this question isn't interesting anymore. I should maybe close it ... ;-) –  Alfe Apr 14 at 9:27

1 Answer 1

by default exporting submounts over nfs is turned off. The recommended course of action is to also export the submount and have the client mount it as well.

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Yes, I know, but as I wrote I tried various combinations of the mount options which should allow exporting the contents of submounts. In fact, with plain mounted ISO images this works flawlessly. Only with my FUSE it fails. And I cannot mount that FUSE on the client because that host is so old it does not support FUSE. The whole idea of that FUSE-via-NFS is just to allow the client to access the features of that FUSE it cannot run itself. –  Alfe Dec 2 '13 at 8:50
You need to export /exports/example/mount and mount it from the client. –  hildred Dec 2 '13 at 8:55

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