writev() fails when using AUFS on top of ZFS

[Raul E Rangel]

Using the writev() syscall on an AUFS filesystem on top of ZFS fails. You can view the original bug report here https://github.com/dotcloud/docker/issues/1472#issuecomment-22413801.

Simple steps to reporoduce:

$ zfs create rpool/aufs
$ cd /rpool/aufs
$ mkdir ro rw mnt
$ mount -t aufs -o br=rw:ro none mnt
$ cd mnt
$ wvtest

Where wvtest is compiled from https://gist.github.com/jpetazzo/6160048.

Raul

System Info:
Description: Ubuntu 12.04.2 LTS
Release: 12.04

me@slagathor:~$ apt-cache policy linux-image-generic-lts-raring
linux-image-generic-lts-raring:
  Installed: 3.8.0.27.27
  Candidate: 3.8.0.27.27
  Version table:
 *** 3.8.0.27.27 0
        500 http://archive.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Karl Stenerud (kstenerud)]

Still a problem on 14.04