Activate filesystem features only in syncing context

When activating filesystem features after receiving a snapshot, do 
so only in syncing context.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #14304 
Closes #14252

tests/zfs-tests/tests/Makefile.am

@@ -1806,6 +1806,7 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
 	functional/rsend/send-c_zstreamdump.ksh \
 	functional/rsend/send-cpL_varied_recsize.ksh \
 	functional/rsend/send_doall.ksh \
+	functional/rsend/send_encrypted_incremental.ksh \
 	functional/rsend/send_encrypted_files.ksh \
 	functional/rsend/send_encrypted_hierarchy.ksh \
 	functional/rsend/send_encrypted_props.ksh \

tests/zfs-tests/tests/functional/rsend/send_encrypted_incremental.ksh

@@ -0,0 +1,93 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or https://opensource.org/licenses/CDDL-1.0.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/rsend/rsend.kshlib
+
+#
+# Description:
+# Incrementally receiving a snapshot to an encrypted filesystem succeeds.
+#
+# Strategy:
+# 1) Create a pool and an encrypted fs
+# 2) Create some files and snapshots
+# 3) Send the first snapshot to a second encrypted as well as an
+#	unencrypted fs.
+# 4) Incrementally send the second snapshot to the unencrypted fs.
+# 5) Rollback the second encrypted fs to the first snapshot.
+# 6) Incrementally send the second snapshot from the unencrypted to the
+#	second encrypted fs.
+# 7) Incrementally send the third snapshot from the first encrypted to the
+#	unencrypted fs.
+# 8) Incrementally send the third snapshot from the unencrypted to the second
+#	encrypted fs.
+#
+
+verify_runnable "both"
+
+log_assert "Incrementally receiving a snapshot to an encrypted filesystem succeeds"
+
+function cleanup
+{
+	destroy_pool pool_lb
+	log_must rm -f $TESTDIR/vdev_a
+}
+
+log_onexit cleanup
+
+typeset passphrase="password"
+typeset passphrase2="password2"
+
+typeset file="/pool_lb/encryptme/$TESTFILE0"
+typeset file1="/pool_lb/encryptme/$TESTFILE1"
+typeset file2="/pool_lb/encryptme/$TESTFILE2"
+
+# Create pool
+truncate -s $MINVDEVSIZE $TESTDIR/vdev_a
+log_must zpool create -f pool_lb $TESTDIR/vdev_a
+log_must eval "echo $passphrase > /pool_lb/pwd"
+log_must eval "echo $passphrase2 > /pool_lb/pwd2"
+
+log_must zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=file:///pool_lb/pwd pool_lb/encryptme
+log_must dd if=/dev/urandom of=$file bs=1024 count=1024
+log_must zfs snapshot pool_lb/encryptme@snap1
+log_must dd if=/dev/urandom of=$file1 bs=1024 count=1024
+log_must zfs snapshot pool_lb/encryptme@snap2
+log_must dd if=/dev/urandom of=$file2 bs=1024 count=1024
+log_must zfs snapshot pool_lb/encryptme@snap3
+log_must eval "zfs send -Lc pool_lb/encryptme@snap1 | zfs recv \
+	-o encryption=on -o keyformat=passphrase -o keylocation=file:///pool_lb/pwd2 \
+	pool_lb/encrypttwo"
+log_must eval "zfs send -Lc pool_lb/encryptme@snap1 | zfs recv \
+	pool_lb/unencryptme"
+log_must eval "zfs send -Lc -i pool_lb/encryptme@{snap1,snap2} | zfs recv \
+	pool_lb/unencryptme"
+log_must zfs rollback pool_lb/encrypttwo@snap1
+log_must eval "zfs send -Lc -i pool_lb/unencryptme@{snap1,snap2} | zfs recv \
+	pool_lb/encrypttwo"
+log_must eval "zfs send -Lc -i pool_lb/encryptme@{snap2,snap3} | zfs recv \
+	pool_lb/unencryptme"
+log_must eval "zfs send -Lc -i pool_lb/unencryptme@{snap2,snap3} | zfs recv \
+	-F pool_lb/encrypttwo"
+
+log_pass "Incrementally receiving a snapshot to an encrypted filesystem succeeds"

tests/zfs-tests/tests/functional/rsend/send_raw_large_blocks.ksh

@@ -49,7 +49,7 @@ raw_backup=$TEST_BASE_DIR/raw_backup
 function cleanup
 {
 	log_must rm -f $backup $raw_backup $ibackup $unc_backup
-	destroy_pool pool_lb/fs
+	destroy_pool pool_lb
 	log_must rm -f $TESTDIR/vdev_a
 }