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Didier Roche 5f67022bf7 Workaround to avoid a race when /var/lib is a persistent dataset 
If /var/lib is a dataset not under <pool>/ROOT/<root_dataset>, as
proposed in the ubuntu root on zfs upstream guide
(https://github.com/zfsonlinux/zfs/wiki/Ubuntu-18.04-Root-on-ZFS),
we end up with a race where some services, like systemd-random-seed
are writing under /var/lib, while zfs-mount is called. zfs mount will
then potentially fail because of /var/lib isn't empty and so, can't be
mounted.
Order those 2 units for now (more may be needed) as we can't declare
virtually a provide mount point to match
"RequiresMountsFor=/var/lib/systemd/random-seed" from
systemd-random-seed.service.
The optional generator for zfs 0.8 fixes it, but it's not enabled
by default nor necessarily required.

Example:
- rpool/ROOT/ubuntu (mountpoint = /)
- rpool/var/ (mountpoint = /var)
- rpool/var/lib  (mountpoint = /var/lib)

Both zfs-mount.service and systemd-random-seed.service are starting
After=systemd-remount-fs.service. zfs-mount.service should be done
before local-fs.target while systemd-random-seed.service should finish
before sysinit.target (which is a later target).
Ideally, we would have a way for zfs mount -a unit to declare all paths
or move systemd-random-seed after local-fs.target.

Reviewed-by: Antonio Russo <antonio.e.russo@gmail.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Didier Roche <didrocks@ubuntu.com>
Closes #9360
2020-01-22 13:49:02 -08:00
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cmd Linux 5.0 compat: SIMD compatibility 2020-01-22 13:49:01 -08:00
config Perform KABI checks in parallel 2020-01-22 13:49:01 -08:00
contrib Fix for zfs-dracut regression 2020-01-22 13:49:01 -08:00
etc Workaround to avoid a race when /var/lib is a persistent dataset 2020-01-22 13:49:02 -08:00
include SIMD: Use alloc_pages_node to force alignment 2020-01-22 13:49:01 -08:00
lib Refactor libzfs_error_init newlines 2020-01-22 13:49:01 -08:00
man Add warning for zfs_vdev_elevator option removal 2020-01-22 13:49:01 -08:00
module Linux 5.0 compat: SIMD compatibility 2020-01-22 13:49:01 -08:00
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README.md

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ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.

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Official Resources

Installation

Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.

Contribute & Develop

We have a separate document with contribution guidelines.

Release

ZFS on Linux is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported kernel versions.