[Bug 1280633] Re: Unable to export aufs mountpoint - qword_eol: fflush failed: errno 22 (Invalid argument)

[Omega Weapon]

Sigh, took me all day to work out that this is due to aufs not providing
a filesystem ID - add any old fsid to the export options, e.g:

/mnt/omegafw_aufs_backup/
omega1(rw,sync,no_root_squash,no_subtree_check,fsid=1337)

and suddenly it works!

This is also mentioned in aufs' documentation:

http://aufs.sourceforge.net/aufs3/man.html#Exporting%20Aufs%20via%20NFS

Hopefully now when someone gets the 'qword_eol: fflush failed' useless
error message they'll know what to do.

** Changed in: nfs-utils (Ubuntu)
       Status: New => Invalid

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Title:
  Unable to export aufs mountpoint - qword_eol: fflush failed: errno 22
  (Invalid argument)

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

Bug description:
  Exporting the following aufs mountpoint (which is mounted):

  ==============================================================================

  /mnt/omegafw_aufs_backup
  omega1(rw,sync,mountpoint,no_root_squash,no_subtree_check)

  ==============================================================================

  and then mounting on a client machine results in the following error
  on the server:

  =========================================

  qword_eol: fflush failed: errno 22 (Invalid argument)

  =========================================

  I have enabled debugging, the following is output:

  ========================================================================================

  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_fh: inbuf 'omega1.omeganet 1 \x00000000'
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_fh: found 0x95592e8 path /
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_export: inbuf 'omega1.omeganet /mnt'
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_export: found 0x9559778 path /mnt
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_fh: inbuf 'omega1.omeganet 7 \x016008000000000057ab3e2836bf4055a6bd4a8399a01c5a'
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_fh: found 0x9559780 path /mnt
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_export: inbuf 'omega1.omeganet /mnt/omegafw_aufs_backup'
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: qword_eol: fprintf failed: errno 22 (Invalid argument)
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: Cannot export /mnt/omegafw_aufs_backup, possibly unsupported filesystem or fsid= required
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: nfsd_export: found 0x9558e48 path /mnt/omegafw_aufs_backup
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: from_local: updating local if addr list
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: from_local: checked 11 local if addrs; incoming address not found
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: check_default: access by 10.1.0.2 ALLOWED
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: Received NULL request from 10.1.0.2
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: check_default: access by 10.1.0.2 ALLOWED (cached)
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: Received NULL request from 10.1.0.2
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: check_default: access by 10.1.0.2 ALLOWED (cached)
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: Received MNT3(/mnt/omegafw_aufs_backup) request from 10.1.0.2
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: authenticated mount request from 10.1.0.2:787 for /mnt/omegafw_aufs_backup (/mnt/omegafw_aufs_backup)
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: qword_eol: fflush failed: errno 22 (Invalid argument)
  Feb 15 16:25:16 OmegaFW rpc.mountd[4896]: Cannot export /mnt/omegafw_aufs_backup, possibly unsupported filesystem or fsid= required

  ========================================================================================

  A normal trivial nfs export worked (a disk with a few directories on
  it).

  The aufs filesystem bridges 4 disks which maintain 1780822
  files/directories, so is pretty large. Its possible that rpc.mountd
  can't cope, which is suggested in this Red Hat bug which appears to be
  semi-ignored:

  https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=812364

  I'll be trying to do the same thing in Samba now.

  --------------------------------------------------

  uname -a: Linux OmegaFW 3.11.0-15-generic #25-Ubuntu SMP Thu Jan 30 17:25:07 UTC 2014 i686 i686 i686 GNU/Linux
  Ubuntu 13.10
  nfs-kernel-server version: 1:1.2.8-2ubuntu2

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