Add more refquota tests

It used to be possible for zfs receive (and other operations related
to clone swap) to bypass refquotas. This can cause a number of issues,
and there should be an automated test for it.

Added tests for rollback and receive not overriding refquota.

Reviewed-by: Pavel Zakharov <[email protected]>
Reviewed-by: John Kennedy <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Paul Dagnelie <[email protected]>
Closes openzfs#9139

tests/runfiles/linux.run

@@ -750,7 +750,8 @@ tags = ['functional', 'redundancy']
 
 [tests/functional/refquota]
 tests = ['refquota_001_pos', 'refquota_002_pos', 'refquota_003_pos',
-    'refquota_004_pos', 'refquota_005_pos', 'refquota_006_neg']
+    'refquota_004_pos', 'refquota_005_pos', 'refquota_006_neg',
+    'refquota_007_neg', 'refquota_008_neg']
 tags = ['functional', 'refquota']
 
 [tests/functional/refreserv]

tests/zfs-tests/tests/functional/refquota/Makefile.am

@@ -7,4 +7,6 @@ dist_pkgdata_SCRIPTS = \
 	refquota_003_pos.ksh \
 	refquota_004_pos.ksh \
 	refquota_005_pos.ksh \
-	refquota_006_neg.ksh
+	refquota_006_neg.ksh \
+	refquota_007_neg.ksh \
+	refquota_008_neg.ksh

tests/zfs-tests/tests/functional/refquota/refquota_007_neg.ksh

@@ -0,0 +1,61 @@
+#!/bin/ksh
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2013 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+#       refquota limits the amount of space a dataset can consume,
+#       snapshot rollback should be limited by refquota.
+#
+# STRATEGY:
+#       1. Create a file in a filesystem
+#       2. Create a snapshot of the filesystem
+#       3. Remove the file
+#       4. Set a refquota of size half of the file
+#       5. Rollback the filesystem from the snapshot
+#       6. Rollback should fail
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	log_must $ZFS destroy -rf $TESTPOOL/$TESTFS
+	log_must $ZFS create $TESTPOOL/$TESTFS
+	log_must $ZFS set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
+}
+
+log_onexit cleanup
+
+TESTFILE='testfile'
+FS=$TESTPOOL/$TESTFS
+
+mntpnt=$(get_prop mountpoint $FS)
+log_must mkfile 20M $mntpnt/$TESTFILE
+log_must zfs snapshot $FS@snap20M
+log_must rm $mntpnt/$TESTFILE
+
+log_must sync
+
+log_must zfs set refquota=10M $FS
+log_mustnot zfs rollback $FS@snap20M
+
+log_pass "The rollback to the snapshot was restricted by refquota."

tests/zfs-tests/tests/functional/refquota/refquota_008_neg.ksh

@@ -0,0 +1,71 @@
+#!/bin/ksh
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2013 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+#       refquota limits the amount of space a dataset can consume,
+#       This test verifies that zfs receive does not override
+#       refquota.
+#
+# STRATEGY:
+#       1. Create a sub-filesystem $TESTSUBFS1
+#       2. Create a file in the sub-filesystem $TESTSUBFS1
+#       3. Create a snapshot of the sub-filesystem $TESTSUBFS1
+#       4. Create another sub-filesystem $TESTSUBFS2
+#       5. Apply a refquota value to $TESTSUBFS2,
+#		half the sub-filesystem $TESTSUBFS1 file size
+#       6. Verify that zfs receive of the snapshot of $TESTSUBFS1
+#		fails due to refquota
+#
+
+verify_runnable "both"
+
+oldvalue=$(get_tunable spa_asize_inflation)
+function cleanup
+{
+	set_tunable32 spa_asize_inflation $oldvalue
+        log_must zfs destroy -rf $TESTPOOL/$TESTFS
+        log_must zfs create $TESTPOOL/$TESTFS
+        log_must zfs set mountpoint=$TESTDIR $TESTPOOL/$TESTFS
+}
+
+log_onexit cleanup
+
+set_tunable32 spa_asize_inflation 2
+
+TESTFILE='testfile'
+FS=$TESTPOOL/$TESTFS
+log_must zfs create $FS/$TESTSUBFS1
+log_must zfs create $FS/$TESTSUBFS2
+
+mntpnt1=$(get_prop mountpoint $FS/$TESTSUBFS1)
+mntpnt2=$(get_prop mountpoint $FS/$TESTSUBFS2)
+
+log_must mkfile 200M $mntpnt1/$TESTFILE
+log_must zfs snapshot $FS/$TESTSUBFS1@snap200m
+
+log_must zfs set refquota=10M $FS/$TESTSUBFS2
+log_mustnot eval "zfs send $FS/$TESTSUBFS1@snap200m |" \
+        "zfs receive -F $FS/$TESTSUBFS2"
+
+log_pass "ZFS receive does not override refquota"
+