diff --git a/tests/runfiles/linux.run b/tests/runfiles/linux.run
index 618eeb934017..b68202d84924 100644
--- a/tests/runfiles/linux.run
+++ b/tests/runfiles/linux.run
@@ -34,6 +34,15 @@ tags = ['functional', 'acl', 'posix-sa']
 tests = ['atime_003_pos', 'root_relatime_on']
 tags = ['functional', 'atime']
 
+[tests/functional/block_cloning:Linux]
+tests = ['block_cloning_copyfilerange', 'block_cloning_copyfilerange_partial',
+    'block_cloning_ficlone', 'block_cloning_ficlonerange',
+    'block_cloning_ficlonerange_partial',
+    'block_cloning_disabled_copyfilerange', 'block_cloning_disabled_ficlone',
+    'block_cloning_disabled_ficlonerange',
+    'block_cloning_copyfilerange_cross_dataset']
+tags = ['functional', 'block_cloning']
+
 [tests/functional/chattr:Linux]
 tests = ['chattr_001_pos', 'chattr_002_neg']
 tags = ['functional', 'chattr']
diff --git a/tests/test-runner/bin/zts-report.py.in b/tests/test-runner/bin/zts-report.py.in
index cf438e0e6495..c9a2b4179aec 100755
--- a/tests/test-runner/bin/zts-report.py.in
+++ b/tests/test-runner/bin/zts-report.py.in
@@ -134,6 +134,12 @@ ci_reason = 'CI runner doesn\'t have all requirements'
 #
 idmap_reason = 'Idmapped mount needs kernel 5.12+'
 
+#
+# copy_file_range() is not supported by all kernels
+#
+cfr_reason = 'Kernel copy_file_range support required'
+cfr_cross_reason = 'copy_file_range(2) cross-filesystem needs kernel 5.3+'
+
 #
 # These tests are known to fail, thus we use this list to prevent these
 # failures from failing the job as a whole; only unexpected failures
@@ -288,6 +294,14 @@ elif sys.platform.startswith('linux'):
         'idmap_mount/idmap_mount_003': ['SKIP', idmap_reason],
         'idmap_mount/idmap_mount_004': ['SKIP', idmap_reason],
         'idmap_mount/idmap_mount_005': ['SKIP', idmap_reason],
+        'block_cloning/block_cloning_disabled_copyfilerange':
+            ['SKIP', cfr_reason],
+        'block_cloning/block_cloning_copyfilerange':
+            ['SKIP', cfr_reason],
+        'block_cloning/block_cloning_copyfilerange_partial':
+            ['SKIP', cfr_reason],
+        'block_cloning/block_cloning_copyfilerange_cross_dataset':
+            ['SKIP', cfr_cross_reason],
     })
 
 
diff --git a/tests/zfs-tests/cmd/.gitignore b/tests/zfs-tests/cmd/.gitignore
index f68f58072818..5f53b687191a 100644
--- a/tests/zfs-tests/cmd/.gitignore
+++ b/tests/zfs-tests/cmd/.gitignore
@@ -1,6 +1,7 @@
 /badsend
 /btree_test
 /chg_usr_exec
+/clonefile
 /devname2devid
 /dir_rd_update
 /draid
diff --git a/tests/zfs-tests/cmd/Makefile.am b/tests/zfs-tests/cmd/Makefile.am
index 066abb6ce3b5..9bdb3c209756 100644
--- a/tests/zfs-tests/cmd/Makefile.am
+++ b/tests/zfs-tests/cmd/Makefile.am
@@ -119,6 +119,7 @@ scripts_zfs_tests_bin_PROGRAMS += %D%/renameat2
 scripts_zfs_tests_bin_PROGRAMS += %D%/xattrtest
 scripts_zfs_tests_bin_PROGRAMS += %D%/zed_fd_spill-zedlet
 scripts_zfs_tests_bin_PROGRAMS += %D%/idmap_util
+scripts_zfs_tests_bin_PROGRAMS += %D%/clonefile
 
 %C%_idmap_util_LDADD = libspl.la
 
diff --git a/tests/zfs-tests/cmd/clonefile.c b/tests/zfs-tests/cmd/clonefile.c
new file mode 100644
index 000000000000..a7e7277ae411
--- /dev/null
+++ b/tests/zfs-tests/cmd/clonefile.c
@@ -0,0 +1,333 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (c) 2023, Rob Norris <robn@despairlabs.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/*
+ * This program is to test the availability and behaviour of copy_file_range,
+ * FICLONE, FICLONERANGE and FIDEDUPERANGE in the Linux kernel. It should
+ * compile and run even if these features aren't exposed through the libc.
+ */
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#ifndef __NR_copy_file_range
+#if defined(__x86_64__)
+#define	__NR_copy_file_range (326)
+#elif defined(__i386__)
+#define	__NR_copy_file_range (377)
+#elif defined(__s390__)
+#define	__NR_copy_file_range (375)
+#elif defined(__arm__)
+#define	__NR_copy_file_range (391)
+#elif defined(__aarch64__)
+#define	__NR_copy_file_range (285)
+#elif defined(__powerpc__)
+#define	__NR_copy_file_range (379)
+#else
+#error "no definition of __NR_copy_file_range for this platform"
+#endif
+#endif /* __NR_copy_file_range */
+
+ssize_t
+copy_file_range(int, loff_t *, int, loff_t *, size_t, unsigned int)
+    __attribute__((weak));
+
+static inline ssize_t
+cf_copy_file_range(int sfd, loff_t *soff, int dfd, loff_t *doff,
+    size_t len, unsigned int flags)
+{
+	if (copy_file_range)
+		return (copy_file_range(sfd, soff, dfd, doff, len, flags));
+	return (
+	    syscall(__NR_copy_file_range, sfd, soff, dfd, doff, len, flags));
+}
+
+/* Define missing FICLONE */
+#ifdef FICLONE
+#define	CF_FICLONE	FICLONE
+#else
+#define	CF_FICLONE	_IOW(0x94, 9, int)
+#endif
+
+/* Define missing FICLONERANGE and support structs */
+#ifdef FICLONERANGE
+#define	CF_FICLONERANGE	FICLONERANGE
+typedef struct file_clone_range cf_file_clone_range_t;
+#else
+typedef struct {
+	int64_t		src_fd;
+	uint64_t	src_offset;
+	uint64_t	src_length;
+	uint64_t	dest_offset;
+} cf_file_clone_range_t;
+#define	CF_FICLONERANGE	_IOW(0x94, 13, cf_file_clone_range_t)
+#endif
+
+/* Define missing FIDEDUPERANGE and support structs */
+#ifdef FIDEDUPERANGE
+#define	CF_FIDEDUPERANGE		FIDEDUPERANGE
+#define	CF_FILE_DEDUPE_RANGE_SAME	FILE_DEDUPE_RANGE_SAME
+#define	CF_FILE_DEDUPE_RANGE_DIFFERS	FILE_DEDUPE_RANGE_DIFFERS
+typedef struct file_dedupe_range_info	cf_file_dedupe_range_info_t;
+typedef struct file_dedupe_range	cf_file_dedupe_range_t;
+#else
+typedef struct {
+	int64_t dest_fd;
+	uint64_t dest_offset;
+	uint64_t bytes_deduped;
+	int32_t status;
+	uint32_t reserved;
+} cf_file_dedupe_range_info_t;
+typedef struct {
+	uint64_t src_offset;
+	uint64_t src_length;
+	uint16_t dest_count;
+	uint16_t reserved1;
+	uint32_t reserved2;
+	cf_file_dedupe_range_info_t info[0];
+} cf_file_dedupe_range_t;
+#define	CF_FIDEDUPERANGE		_IOWR(0x94, 54, cf_file_dedupe_range_t)
+#define	CF_FILE_DEDUPE_RANGE_SAME	(0)
+#define	CF_FILE_DEDUPE_RANGE_DIFFERS	(1)
+#endif
+
+typedef enum {
+	CF_MODE_NONE,
+	CF_MODE_CLONE,
+	CF_MODE_CLONERANGE,
+	CF_MODE_COPYFILERANGE,
+	CF_MODE_DEDUPERANGE,
+} cf_mode_t;
+
+static int
+usage(void)
+{
+	printf(
+	    "usage:\n"
+	    "  FICLONE:\n"
+	    "    clonefile -c <src> <dst>\n"
+	    "  FICLONERANGE:\n"
+	    "    clonefile -r <src> <dst> <soff> <doff> <len>\n"
+	    "  copy_file_range:\n"
+	    "    clonefile -f <src> <dst> <soff> <doff> <len>\n"
+	    "  FIDEDUPERANGE:\n"
+	    "    clonefile -d <src> <dst> <soff> <doff> <len>\n");
+	return (1);
+}
+
+int do_clone(int sfd, int dfd);
+int do_clonerange(int sfd, int dfd, loff_t soff, loff_t doff, size_t len);
+int do_copyfilerange(int sfd, int dfd, loff_t soff, loff_t doff, size_t len);
+int do_deduperange(int sfd, int dfd, loff_t soff, loff_t doff, size_t len);
+
+int quiet = 0;
+
+int
+main(int argc, char **argv)
+{
+	cf_mode_t mode = CF_MODE_NONE;
+
+	char c;
+	while ((c = getopt(argc, argv, "crfdq")) != -1) {
+		switch (c) {
+			case 'c':
+				mode = CF_MODE_CLONE;
+				break;
+			case 'r':
+				mode = CF_MODE_CLONERANGE;
+				break;
+			case 'f':
+				mode = CF_MODE_COPYFILERANGE;
+				break;
+			case 'd':
+				mode = CF_MODE_DEDUPERANGE;
+				break;
+			case 'q':
+				quiet = 1;
+				break;
+		}
+	}
+
+	if (mode == CF_MODE_NONE || (argc-optind) < 2 ||
+	    (mode != CF_MODE_CLONE && (argc-optind) < 5))
+		return (usage());
+
+	loff_t soff = 0, doff = 0;
+	size_t len = 0;
+	if (mode != CF_MODE_CLONE) {
+		soff = strtoull(argv[optind+2], NULL, 10);
+		if (soff == ULLONG_MAX) {
+			fprintf(stderr, "invalid source offset");
+			return (1);
+		}
+		doff = strtoull(argv[optind+3], NULL, 10);
+		if (doff == ULLONG_MAX) {
+			fprintf(stderr, "invalid dest offset");
+			return (1);
+		}
+		len = strtoull(argv[optind+4], NULL, 10);
+		if (len == ULLONG_MAX) {
+			fprintf(stderr, "invalid length");
+			return (1);
+		}
+	}
+
+	int sfd = open(argv[optind], O_RDONLY);
+	if (sfd < 0) {
+		fprintf(stderr, "open: %s: %s\n",
+		    argv[optind], strerror(errno));
+		return (1);
+	}
+
+	int dfd = open(argv[optind+1], O_WRONLY|O_CREAT,
+	    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+	if (sfd < 0) {
+		fprintf(stderr, "open: %s: %s\n",
+		    argv[optind+1], strerror(errno));
+		close(sfd);
+		return (1);
+	}
+
+	int err;
+	switch (mode) {
+		case CF_MODE_CLONE:
+			err = do_clone(sfd, dfd);
+			break;
+		case CF_MODE_CLONERANGE:
+			err = do_clonerange(sfd, dfd, soff, doff, len);
+			break;
+		case CF_MODE_COPYFILERANGE:
+			err = do_copyfilerange(sfd, dfd, soff, doff, len);
+			break;
+		case CF_MODE_DEDUPERANGE:
+			err = do_deduperange(sfd, dfd, soff, doff, len);
+			break;
+		default:
+			abort();
+	}
+
+	off_t spos = lseek(sfd, 0, SEEK_CUR);
+	off_t slen = lseek(sfd, 0, SEEK_END);
+	off_t dpos = lseek(dfd, 0, SEEK_CUR);
+	off_t dlen = lseek(dfd, 0, SEEK_END);
+
+	fprintf(stderr, "file offsets: src=%lu/%lu; dst=%lu/%lu\n", spos, slen,
+	    dpos, dlen);
+
+	close(dfd);
+	close(sfd);
+
+	return (err == 0 ? 0 : 1);
+}
+
+int
+do_clone(int sfd, int dfd)
+{
+	fprintf(stderr, "using FICLONE\n");
+	int err = ioctl(dfd, CF_FICLONE, sfd);
+	if (err < 0) {
+		fprintf(stderr, "ioctl(FICLONE): %s\n", strerror(errno));
+		return (err);
+	}
+	return (0);
+}
+
+int
+do_clonerange(int sfd, int dfd, loff_t soff, loff_t doff, size_t len)
+{
+	fprintf(stderr, "using FICLONERANGE\n");
+	cf_file_clone_range_t fcr = {
+		.src_fd = sfd,
+		.src_offset = soff,
+		.src_length = len,
+		.dest_offset = doff,
+	};
+	int err = ioctl(dfd, CF_FICLONERANGE, &fcr);
+	if (err < 0) {
+		fprintf(stderr, "ioctl(FICLONERANGE): %s\n", strerror(errno));
+		return (err);
+	}
+	return (0);
+}
+
+int
+do_copyfilerange(int sfd, int dfd, loff_t soff, loff_t doff, size_t len)
+{
+	fprintf(stderr, "using copy_file_range\n");
+	ssize_t copied = cf_copy_file_range(sfd, &soff, dfd, &doff, len, 0);
+	if (copied < 0) {
+		fprintf(stderr, "copy_file_range: %s\n", strerror(errno));
+		return (1);
+	}
+	if (copied != len) {
+		fprintf(stderr, "copy_file_range: copied less than requested: "
+		    "requested=%lu; copied=%lu\n", len, copied);
+		return (1);
+	}
+	return (0);
+}
+
+int
+do_deduperange(int sfd, int dfd, loff_t soff, loff_t doff, size_t len)
+{
+	fprintf(stderr, "using FIDEDUPERANGE\n");
+
+	char buf[sizeof (cf_file_dedupe_range_t)+
+	    sizeof (cf_file_dedupe_range_info_t)] = {0};
+	cf_file_dedupe_range_t *fdr = (cf_file_dedupe_range_t *)&buf[0];
+	cf_file_dedupe_range_info_t *fdri =
+	    (cf_file_dedupe_range_info_t *)
+	    &buf[sizeof (cf_file_dedupe_range_t)];
+
+	fdr->src_offset = soff;
+	fdr->src_length = len;
+	fdr->dest_count = 1;
+
+	fdri->dest_fd = dfd;
+	fdri->dest_offset = doff;
+
+	int err = ioctl(sfd, CF_FIDEDUPERANGE, fdr);
+	if (err != 0)
+		fprintf(stderr, "ioctl(FIDEDUPERANGE): %s\n", strerror(errno));
+
+	if (fdri->status < 0) {
+		fprintf(stderr, "dedup failed: %s\n", strerror(-fdri->status));
+		err = -1;
+	} else if (fdri->status == CF_FILE_DEDUPE_RANGE_DIFFERS) {
+		fprintf(stderr, "dedup failed: range differs\n");
+		err = -1;
+	}
+
+	return (err);
+}
diff --git a/tests/zfs-tests/include/commands.cfg b/tests/zfs-tests/include/commands.cfg
index b3cfe149ffa7..fa545e06bbf3 100644
--- a/tests/zfs-tests/include/commands.cfg
+++ b/tests/zfs-tests/include/commands.cfg
@@ -182,6 +182,7 @@ export ZFS_FILES='zdb
 export ZFSTEST_FILES='badsend
     btree_test
     chg_usr_exec
+    clonefile
     devname2devid
     dir_rd_update
     draid
diff --git a/tests/zfs-tests/tests/Makefile.am b/tests/zfs-tests/tests/Makefile.am
index ff65dc1ac2b0..0819cb6b576e 100644
--- a/tests/zfs-tests/tests/Makefile.am
+++ b/tests/zfs-tests/tests/Makefile.am
@@ -90,6 +90,7 @@ nobase_dist_datadir_zfs_tests_tests_DATA += \
 	functional/alloc_class/alloc_class.kshlib \
 	functional/atime/atime.cfg \
 	functional/atime/atime_common.kshlib \
+	functional/block_cloning/block_cloning.kshlib \
 	functional/cache/cache.cfg \
 	functional/cache/cache.kshlib \
 	functional/cachefile/cachefile.cfg \
@@ -437,6 +438,17 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
 	functional/atime/root_atime_on.ksh \
 	functional/atime/root_relatime_on.ksh \
 	functional/atime/setup.ksh \
+	functional/block_cloning/cleanup.ksh \
+	functional/block_cloning/setup.ksh \
+	functional/block_cloning/block_cloning_copyfilerange_cross_dataset.ksh \
+	functional/block_cloning/block_cloning_copyfilerange.ksh \
+	functional/block_cloning/block_cloning_copyfilerange_partial.ksh \
+	functional/block_cloning/block_cloning_disabled_copyfilerange.ksh \
+	functional/block_cloning/block_cloning_disabled_ficlone.ksh \
+	functional/block_cloning/block_cloning_disabled_ficlonerange.ksh \
+	functional/block_cloning/block_cloning_ficlone.ksh \
+	functional/block_cloning/block_cloning_ficlonerange.ksh \
+	functional/block_cloning/block_cloning_ficlonerange_partial.ksh \
 	functional/bootfs/bootfs_001_pos.ksh \
 	functional/bootfs/bootfs_002_neg.ksh \
 	functional/bootfs/bootfs_003_pos.ksh \
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning.kshlib b/tests/zfs-tests/tests/functional/block_cloning/block_cloning.kshlib
new file mode 100644
index 000000000000..9998e5a87bfe
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning.kshlib
@@ -0,0 +1,46 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+function have_same_content
+{
+	typeset hash1=$(cat $1 | md5sum)
+	typeset hash2=$(cat $2 | md5sum)
+
+	log_must [ "$hash1" = "$hash2" ]
+}
+
+function unique_blocks
+{
+	typeset zdbout=${TMPDIR:-$TEST_BASE_DIR}/zdbout.$$
+	zdb -vvvvv $1 -O $2 | \
+	    awk '/ L0 / { print ++l " " $3 " " $7 }' > $zdbout.a
+	zdb -vvvvv $3 -O $4 | \
+	    awk '/ L0 / { print ++l " " $3 " " $7 }' > $zdbout.b
+	echo $(sort $zdbout.a $zdbout.b | uniq -d | cut -f1 -d' ')
+}
+
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange.ksh
new file mode 100755
index 000000000000..9adcbfcd88a1
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange.ksh
@@ -0,0 +1,60 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+if [[ $(linux_version) -lt $(linux_version "4.5") ]]; then
+  log_unsupported "copy_file_range not available before Linux 4.5"
+fi
+
+claim="The copy_file_range syscall can clone whole files."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=enabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must clonefile -f /$TESTPOOL/file1 /$TESTPOOL/file2 0 0 524288
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "1 2 3 4" ]
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange_cross_dataset.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange_cross_dataset.ksh
new file mode 100755
index 000000000000..07e089e89ceb
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange_cross_dataset.ksh
@@ -0,0 +1,65 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+if [[ $(linux_version) -lt $(linux_version "5.3") ]]; then
+  log_unsupported "copy_file_range can't copy cross-filesystem before Linux 5.3"
+fi
+
+claim="The copy_file_range syscall can clone across datasets."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=enabled $TESTPOOL $DISKS
+
+log_must zfs create $TESTPOOL/$TESTFS1
+log_must zfs create $TESTPOOL/$TESTFS2
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/$TESTFS1/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must \
+    clonefile -f /$TESTPOOL/$TESTFS1/file1 /$TESTPOOL/$TESTFS2/file2 0 0 524288
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/$TESTFS1/file1 /$TESTPOOL/$TESTFS2/file2
+
+typeset blocks=$(unique_blocks \
+  $TESTPOOL/$TESTFS1 file1 $TESTPOOL/$TESTFS2 file2)
+log_must [ "$blocks" = "1 2 3 4" ]
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange_partial.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange_partial.ksh
new file mode 100755
index 000000000000..ecac62b20350
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_copyfilerange_partial.ksh
@@ -0,0 +1,68 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+if [[ $(linux_version) -lt $(linux_version "4.5") ]]; then
+  log_unsupported "copy_file_range not available before Linux 4.5"
+fi
+
+claim="The copy_file_range syscall can clone parts of a file."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=enabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must dd if=/$TESTPOOL/file1 of=/$TESTPOOL/file2 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "" ]
+
+log_must clonefile -f /$TESTPOOL/file1 /$TESTPOOL/file2 131072 131072 262144
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "2 3" ]
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_copyfilerange.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_copyfilerange.ksh
new file mode 100755
index 000000000000..30b155a140c4
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_copyfilerange.ksh
@@ -0,0 +1,60 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+if [[ $(linux_version) -lt $(linux_version "4.5") ]]; then
+  log_unsupported "copy_file_range not available before Linux 4.5"
+fi
+
+claim="The copy_file_range syscall copies files when block cloning is disabled."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=disabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must clonefile -f /$TESTPOOL/file1 /$TESTPOOL/file2 0 0 524288
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "" ]
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_ficlone.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_ficlone.ksh
new file mode 100755
index 000000000000..10a2715ea253
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_ficlone.ksh
@@ -0,0 +1,50 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+claim="The FICLONE ioctl fails when block cloning is disabled."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=disabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_mustnot clonefile -c /$TESTPOOL/file1 /$TESTPOOL/file2
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_ficlonerange.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_ficlonerange.ksh
new file mode 100755
index 000000000000..e8461e6d3c38
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_disabled_ficlonerange.ksh
@@ -0,0 +1,50 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+claim="The FICLONERANGE ioctl fails when block cloning is disabled."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=disabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_mustnot clonefile -r /$TESTPOOL/file1 /$TESTPOOL/file2 0 0 524288
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlone.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlone.ksh
new file mode 100755
index 000000000000..d13a39229870
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlone.ksh
@@ -0,0 +1,56 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+claim="The FICLONE ioctl can clone files."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=enabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must clonefile -c /$TESTPOOL/file1 /$TESTPOOL/file2
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "1 2 3 4" ]
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlonerange.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlonerange.ksh
new file mode 100755
index 000000000000..6556050c4352
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlonerange.ksh
@@ -0,0 +1,56 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+claim="The FICLONERANGE ioctl can clone whole files."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=enabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must clonefile -r /$TESTPOOL/file1 /$TESTPOOL/file2 0 0 524288
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "1 2 3 4" ]
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlonerange_partial.ksh b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlonerange_partial.ksh
new file mode 100755
index 000000000000..37a3511a26d5
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning_ficlonerange_partial.ksh
@@ -0,0 +1,64 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+claim="The FICLONERANGE ioctl can clone parts of a file."
+
+log_assert $claim
+
+function cleanup
+{
+	datasetexists $TESTPOOL && destroy_pool $TESTPOOL
+}
+
+log_onexit cleanup
+
+log_must zpool create -o feature@block_cloning=enabled $TESTPOOL $DISKS
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/file1 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must dd if=/$TESTPOOL/file1 of=/$TESTPOOL/file2 bs=128K count=4
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "" ]
+
+log_must clonefile -r /$TESTPOOL/file1 /$TESTPOOL/file2 131072 131072 262144
+log_must sync_pool $TESTPOOL
+
+log_must have_same_content /$TESTPOOL/file1 /$TESTPOOL/file2
+
+typeset blocks=$(unique_blocks $TESTPOOL file1 $TESTPOOL file2)
+log_must [ "$blocks" = "2 3" ]
+
+log_pass $claim
diff --git a/tests/zfs-tests/tests/functional/block_cloning/cleanup.ksh b/tests/zfs-tests/tests/functional/block_cloning/cleanup.ksh
new file mode 100755
index 000000000000..7ac13adb6325
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/cleanup.ksh
@@ -0,0 +1,34 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+verify_runnable "global"
+
+default_cleanup_noexit
+
+log_pass
diff --git a/tests/zfs-tests/tests/functional/block_cloning/setup.ksh b/tests/zfs-tests/tests/functional/block_cloning/setup.ksh
new file mode 100755
index 000000000000..512f5a0644df
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/block_cloning/setup.ksh
@@ -0,0 +1,36 @@
+#!/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
+#
+
+#
+# Copyright (c) 2023, Klara Inc.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/block_cloning/block_cloning.kshlib
+
+if ! command -v clonefile > /dev/null ; then
+  log_unsupported "clonefile program required to test block cloning"
+fi
+
+verify_runnable "global"
+
+log_pass