New service that waits on zvol links to be created

The zfs-volume-wait.service scans existing zvols and waits for their
links under /dev to be created. Any service that depends on zvol
links to be there should add a dependency on zfs-volumes.target.
By default, this target is not enabled.

Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Reviewed-by: Antonio Russo <antonio.e.russo@gmail.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Reviewed-by: John Gallagher <john.gallagher@delphix.com>
Reviewed-by: George Wilson <gwilson@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pavel Zakharov <pzakharov@delphix.com>
Closes #8975
This commit is contained in:
Pavel Zakharov
2019-07-17 18:33:05 -04:00
committed by Tony Hutter
parent beb21db3c6
commit 38528476bf
11 changed files with 145 additions and 3 deletions
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dist_man_MANS = zhack.1 ztest.1 raidz_test.1
dist_man_MANS = zhack.1 ztest.1 raidz_test.1 zvol_wait.1
EXTRA_DIST = cstyle.1
install-data-local:
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.Dd July 5, 2019
.Dt ZVOL_WAIT 1 SMM
.Os Linux
.Sh NAME
.Nm zvol_wait
.Nd Wait for ZFS volume links in
.Em /dev
to be created.
.Sh SYNOPSIS
.Nm
.Sh DESCRIPTION
When a ZFS pool is imported, ZFS will register each ZFS volume
(zvol) as a disk device with the system. As the disks are registered,
.Xr \fBudev 7\fR
will asynchronously create symlinks under
.Em /dev/zvol
using the zvol's name.
.Nm
will wait for all those symlinks to be created before returning.
.Sh SEE ALSO
.Xr \fBudev 7\fR