Public bug reported:
---------- Configuration
# echo -e $(grep VERSION= /etc/os-release)\\nSIGNATURE=\"$(cat
/proc/version_signature)\"
VERSION="16.04.3 LTS (Xenial Xerus)"
SIGNATURE="Ubuntu 4.10.0-35.39~16.04.1-generic 4.10.17"
# dpkg --list | grep zfs
ii libzfs2linux 0.6.5.6-0ubuntu18
ii zfs-doc 0.6.5.6-0ubuntu18
ii zfs-initramfs 0.6.5.6-0ubuntu18
ii zfs-zed 0.6.5.6-0ubuntu18
ii zfsutils-linux 0.6.5.6-0ubuntu18
---------- Fault: Creating an overlay of multiple directories on a ZFS volume
does not work
# df /var/tmp
Filesystem Type 1K-blocks Used Available Use% Mounted on
tank07/var/tmp zfs 129916288 128 129916160 1% /var/tmp
# mkdir /var/tmp/{lower,middle,upper,workdir,overlay}
# mount -t overlay overlay
-olowerdir=/var/tmp/middle:/var/tmp/lower,upperdir=/var/tmp/upper,workdir=/var/tmp/workdir
/var/tmp/overlay
mount: wrong fs type, bad option, bad superblock on overlay,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
# dmesg|tail -1
[276328.438284] overlayfs: filesystem on '/var/tmp/upper' not supported as
upperdir
---------- Control test 1: Creating an overlay of multiple directories on
another filesystem works
# df /tmp
Filesystem Type 1K-blocks Used Available Use% Mounted on
tmpfs tmpfs 1048576 133492 915084 13% /tmp
# mkdir /tmp/{lower,middle,upper,workdir,overlay}
# mount -t overlay overlay
-olowerdir=/tmp/middle:/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/workdir
/tmp/overlay
# mount | grep overlay
overlay on /tmp/overlay type overlay
(rw,relatime,lowerdir=/tmp/middle:/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/workdir)
---------- Control test 2: Creating an overlay using AuFS works on ZFS volume
and elsewhere
# mount -t aufs -obr=/tmp/lower:/tmp/middle:/tmp/upper:/tmp/workdir none
/tmp/overlay
# mount -t aufs
-obr=/var/tmp/lower:/var/tmp/middle:/var/tmp/upper:/var/tmp/workdir none
/var/tmp/overlay
# mount | grep aufs
none on /var/tmp/overlay type aufs (rw,relatime,si=9ead1ecae778b250)
none on /tmp/overlay type aufs (rw,relatime,si=9ead1ec9257d1250)
---------- Remark
While the use of AuFS can be used as a workaround in the above scenario, AuFS
in turn will not work with [fuse.]glusterfs mounts (this has been documented
elsewhere). Given that OverlayFS is part of the (upstream) kernel and Ubuntu
now officially supports ZFS, the above should be fixed.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1718761
Title:
It's not possible to use OverlayFS (mount -t overlay) to stack
directories on a ZFS volume
Status in linux package in Ubuntu:
New
Bug description:
---------- Configuration
# echo -e $(grep VERSION= /etc/os-release)\\nSIGNATURE=\"$(cat
/proc/version_signature)\"
VERSION="16.04.3 LTS (Xenial Xerus)"
SIGNATURE="Ubuntu 4.10.0-35.39~16.04.1-generic 4.10.17"
# dpkg --list | grep zfs
ii libzfs2linux 0.6.5.6-0ubuntu18
ii zfs-doc 0.6.5.6-0ubuntu18
ii zfs-initramfs 0.6.5.6-0ubuntu18
ii zfs-zed 0.6.5.6-0ubuntu18
ii zfsutils-linux 0.6.5.6-0ubuntu18
---------- Fault: Creating an overlay of multiple directories on a ZFS volume
does not work
# df /var/tmp
Filesystem Type 1K-blocks Used Available Use% Mounted on
tank07/var/tmp zfs 129916288 128 129916160 1% /var/tmp
# mkdir /var/tmp/{lower,middle,upper,workdir,overlay}
# mount -t overlay overlay
-olowerdir=/var/tmp/middle:/var/tmp/lower,upperdir=/var/tmp/upper,workdir=/var/tmp/workdir
/var/tmp/overlay
mount: wrong fs type, bad option, bad superblock on overlay,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
# dmesg|tail -1
[276328.438284] overlayfs: filesystem on '/var/tmp/upper' not supported as
upperdir
---------- Control test 1: Creating an overlay of multiple directories on
another filesystem works
# df /tmp
Filesystem Type 1K-blocks Used Available Use% Mounted on
tmpfs tmpfs 1048576 133492 915084 13% /tmp
# mkdir /tmp/{lower,middle,upper,workdir,overlay}
# mount -t overlay overlay
-olowerdir=/tmp/middle:/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/workdir
/tmp/overlay
# mount | grep overlay
overlay on /tmp/overlay type overlay
(rw,relatime,lowerdir=/tmp/middle:/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/workdir)
---------- Control test 2: Creating an overlay using AuFS works on ZFS volume
and elsewhere
# mount -t aufs -obr=/tmp/lower:/tmp/middle:/tmp/upper:/tmp/workdir none
/tmp/overlay
# mount -t aufs
-obr=/var/tmp/lower:/var/tmp/middle:/var/tmp/upper:/var/tmp/workdir none
/var/tmp/overlay
# mount | grep aufs
none on /var/tmp/overlay type aufs (rw,relatime,si=9ead1ecae778b250)
none on /tmp/overlay type aufs (rw,relatime,si=9ead1ec9257d1250)
---------- Remark
While the use of AuFS can be used as a workaround in the above scenario, AuFS
in turn will not work with [fuse.]glusterfs mounts (this has been documented
elsewhere). Given that OverlayFS is part of the (upstream) kernel and Ubuntu
now officially supports ZFS, the above should be fixed.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1718761/+subscriptions
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