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Add option for forcible unmounting dataset while receiving snapshot.

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Currently when the dataset is in use we can't receive snapshots.

    zfs send test/1@asd | zfs recv -FM test/2
    cannot unmount '/test/2': Device busy

This commits add option 'M' which attempts to forcibly unmount the
dataset.  Thanks to this we can enforce receiving snapshots in a
single step.

Note that this functionality is not supported on Linux because the
VFS will prevent active mounted filesystems from being unmounted,
even with the force option.  This is the intended VFS behavior.

Test cases were added to verify the expected behavior based on
the platform.

Discussed-with: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Allan Jude <allanjude@freebsd.org>
External-issue: https://reviews.freebsd.org/D22306
Closes #9904
This commit is contained in:
Mariusz Zaborski
2020-03-17 18:08:32 +01:00
committed by GitHub
parent 80d98a8f3a
commit a57d3d45d6
7 changed files with 113 additions and 14 deletions
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man/man8/zfs-receive.8
+8 -5
View File
@@ -30,7 +30,7 @@
.\" Copyright 2018 Nexenta Systems, Inc.
.\" Copyright 2019 Joyent, Inc.
.\"
.Dd June 30, 2019
.Dd February 16, 2020
.Dt ZFS-RECEIVE 8
.Os Linux
.Sh NAME
@@ -39,14 +39,14 @@
.Sh SYNOPSIS
.Nm
.Cm receive
.Op Fl Fhnsuv
.Op Fl FhMnsuv
.Op Fl o Sy origin Ns = Ns Ar snapshot
.Op Fl o Ar property Ns = Ns Ar value
.Op Fl x Ar property
.Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot
.Nm
.Cm receive
.Op Fl Fhnsuv
.Op Fl FhMnsuv
.Op Fl d Ns | Ns Fl e
.Op Fl o Sy origin Ns = Ns Ar snapshot
.Op Fl o Ar property Ns = Ns Ar value
@@ -61,7 +61,7 @@
.It Xo
.Nm
.Cm receive
.Op Fl Fhnsuv
.Op Fl FhMnsuv
.Op Fl o Sy origin Ns = Ns Ar snapshot
.Op Fl o Ar property Ns = Ns Ar value
.Op Fl x Ar property
@@ -70,7 +70,7 @@
.It Xo
.Nm
.Cm receive
.Op Fl Fhnsuv
.Op Fl FhMnsuv
.Op Fl d Ns | Ns Fl e
.Op Fl o Sy origin Ns = Ns Ar snapshot
.Op Fl o Ar property Ns = Ns Ar value
@@ -229,6 +229,9 @@ that element to determine the name of the target file system for the new
snapshot as described in the paragraph above.
.It Fl h
Skip the receive of holds. There is no effect if holds are not sent.
.It Fl M
Force an unmount of the file system while receiving a snapshot.
This option is not supported on Linux.
.It Fl n
Do not actually receive the stream.
This can be useful in conjunction with the