[Bug 1392806] [NEW] NFS server fails to export XFS volume directory

[Naoyuki Tai]

Public bug reported:

Xubuntu 14.04.01 LTS, x86-64.
Linux akhenaten 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

On this machine, "/var" volume is formatted with XFS. XFS is formatted
during the installation of Xubuntu.

/etc/exports has an entry to export "/var/www":
/var/www 192.168.10.0/24(rw,sync,no_root_squash,no_subtree_check,insecure)

The Linux NFS client can mount the NFS export but trying to access it returns an error. (And incorrect message of it.)
mount akhenaten:/var/www /mnt/www
ls /mnt/www

This does not work. I have tried a few variations, and this is what I know.
(1) If you export the root of XFS volume ("/var" this case), it works.
(2) If you create a direcotry such as /exports/www, use "mount -o bind" to bind /var/www with /exports/www and export it, the client times out.
(3) If the file system is EXT4, the NFS export works. (I copied the XFS /var to another disk with EXT4 formatted volume, changed /etc/fstab and rebooted, without any other changes.)

Here is the nfs-kernel-server

Package: nfs-kernel-server               
State: installed
Automatically installed: no
Version: 1:1.2.8-6ubuntu1.1
Priority: optional
Section: net
Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
Architecture: amd64
Uncompressed Size: 524 k
Depends: libblkid1 (>= 2.16), libc6 (>= 2.15), libcap2 (>= 2.10), libsqlite3-0 (>= 3.5.9), libtirpc1, libwrap0
         (>= 7.6-4~), nfs-common (= 1:1.2.8-6ubuntu1.1), ucf, lsb-base (>= 1.3-9ubuntu3)
Conflicts: knfs, knfs, nfs-server, nfs-server, nfs-kernel-server
Replaces: knfs, knfs, nfs-server, nfs-server
Provides: knfs, nfs-server
Description: support for NFS kernel server

ntai at akhenaten:~$ aptitude show xfsprogs
Package: xfsprogs                        
State: installed
Automatically installed: no
Version: 3.1.9ubuntu2
Priority: optional
Section: admin
Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
Architecture: amd64
Uncompressed Size: 2,691 k
Depends: libblkid1 (>= 2.17.2), libc6 (>= 2.14), libreadline5 (>= 5.2), libuuid1 (>= 2.16)
Suggests: xfsdump, acl, attr, quota
Conflicts: xfsprogs
Breaks: xfsdump (< 3.0.0), xfsdump (< 3.0.0)
Replaces: xfsdump (< 3.0.0), xfsdump (< 3.0.0)
Provides: fsck-backend
Description: Utilities for managing the XFS filesystem
 A set of commands to use the XFS filesystem, including mkfs.xfs.

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: nfs xfs

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https://bugs.launchpad.net/bugs/1392806

Title:
  NFS server fails to export XFS volume directory

Status in “nfs-utils” package in Ubuntu:
  New

Bug description:
  Xubuntu 14.04.01 LTS, x86-64.
  Linux akhenaten 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  On this machine, "/var" volume is formatted with XFS. XFS is formatted
  during the installation of Xubuntu.

  /etc/exports has an entry to export "/var/www":
  /var/www 192.168.10.0/24(rw,sync,no_root_squash,no_subtree_check,insecure)

  The Linux NFS client can mount the NFS export but trying to access it returns an error. (And incorrect message of it.)
  mount akhenaten:/var/www /mnt/www
  ls /mnt/www

  This does not work. I have tried a few variations, and this is what I know.
  (1) If you export the root of XFS volume ("/var" this case), it works.
  (2) If you create a direcotry such as /exports/www, use "mount -o bind" to bind /var/www with /exports/www and export it, the client times out.
  (3) If the file system is EXT4, the NFS export works. (I copied the XFS /var to another disk with EXT4 formatted volume, changed /etc/fstab and rebooted, without any other changes.)

  Here is the nfs-kernel-server

  Package: nfs-kernel-server               
  State: installed
  Automatically installed: no
  Version: 1:1.2.8-6ubuntu1.1
  Priority: optional
  Section: net
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: amd64
  Uncompressed Size: 524 k
  Depends: libblkid1 (>= 2.16), libc6 (>= 2.15), libcap2 (>= 2.10), libsqlite3-0 (>= 3.5.9), libtirpc1, libwrap0
           (>= 7.6-4~), nfs-common (= 1:1.2.8-6ubuntu1.1), ucf, lsb-base (>= 1.3-9ubuntu3)
  Conflicts: knfs, knfs, nfs-server, nfs-server, nfs-kernel-server
  Replaces: knfs, knfs, nfs-server, nfs-server
  Provides: knfs, nfs-server
  Description: support for NFS kernel server

  ntai at akhenaten:~$ aptitude show xfsprogs
  Package: xfsprogs                        
  State: installed
  Automatically installed: no
  Version: 3.1.9ubuntu2
  Priority: optional
  Section: admin
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: amd64
  Uncompressed Size: 2,691 k
  Depends: libblkid1 (>= 2.17.2), libc6 (>= 2.14), libreadline5 (>= 5.2), libuuid1 (>= 2.16)
  Suggests: xfsdump, acl, attr, quota
  Conflicts: xfsprogs
  Breaks: xfsdump (< 3.0.0), xfsdump (< 3.0.0)
  Replaces: xfsdump (< 3.0.0), xfsdump (< 3.0.0)
  Provides: fsck-backend
  Description: Utilities for managing the XFS filesystem
   A set of commands to use the XFS filesystem, including mkfs.xfs.

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