diff --git a/META b/META
index f17be8f36e..456ee81229 100644
--- a/META
+++ b/META
@@ -6,5 +6,5 @@ Release:       rc2
 Release-Tags:  relext
 License:       CDDL
 Author:        OpenZFS
-Linux-Maximum: 6.3
+Linux-Maximum: 6.4
 Linux-Minimum: 3.10
diff --git a/cmd/zed/agents/zfs_mod.c b/cmd/zed/agents/zfs_mod.c
index ab7dfbdeb7..ecba2d4a56 100644
--- a/cmd/zed/agents/zfs_mod.c
+++ b/cmd/zed/agents/zfs_mod.c
@@ -609,8 +609,6 @@ zfs_iter_vdev(zpool_handle_t *zhp, nvlist_t *nvl, void *data)
 		 */
 		if (nvlist_lookup_string(nvl, dp->dd_prop, &path) != 0 ||
 		    strcmp(dp->dd_compare, path) != 0) {
-			zed_log_msg(LOG_INFO, "  %s: no match (%s != vdev %s)",
-			    __func__, dp->dd_compare, path);
 			return;
 		}
 		if (dp->dd_new_vdev_guid != 0 && dp->dd_new_vdev_guid != guid) {
diff --git a/config/kernel-vfs-extended-file_range.m4 b/config/kernel-vfs-extended-file_range.m4
new file mode 100644
index 0000000000..a262231312
--- /dev/null
+++ b/config/kernel-vfs-extended-file_range.m4
@@ -0,0 +1,50 @@
+dnl #
+dnl # EL7 have backported copy_file_range and clone_file_range and
+dnl # added them to an "extended" file_operations struct.
+dnl #
+dnl # We're testing for both functions in one here, because they will only
+dnl # ever appear together and we don't want to match a similar method in
+dnl # some future vendor kernel.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_FILE_OPERATIONS_EXTEND], [
+	ZFS_LINUX_TEST_SRC([vfs_file_operations_extend], [
+		#include <linux/fs.h>
+
+		static ssize_t test_copy_file_range(struct file *src_file,
+		    loff_t src_off, struct file *dst_file, loff_t dst_off,
+		    size_t len, unsigned int flags) {
+			(void) src_file; (void) src_off;
+			(void) dst_file; (void) dst_off;
+			(void) len; (void) flags;
+			return (0);
+		}
+
+		static int test_clone_file_range(struct file *src_file,
+		    loff_t src_off, struct file *dst_file, loff_t dst_off,
+		    u64 len) {
+			(void) src_file; (void) src_off;
+			(void) dst_file; (void) dst_off;
+			(void) len;
+			return (0);
+		}
+
+		static const struct file_operations_extend
+		    fops __attribute__ ((unused)) = {
+			.kabi_fops = {},
+			.copy_file_range = test_copy_file_range,
+			.clone_file_range = test_clone_file_range,
+		};
+	],[])
+])
+AC_DEFUN([ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND], [
+	AC_MSG_CHECKING([whether file_operations_extend takes \
+.copy_file_range() and .clone_file_range()])
+	ZFS_LINUX_TEST_RESULT([vfs_file_operations_extend], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_VFS_FILE_OPERATIONS_EXTEND, 1,
+		    [file_operations_extend takes .copy_file_range()
+		    and .clone_file_range()])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
diff --git a/config/kernel-vfs-file_range.m4 b/config/kernel-vfs-file_range.m4
new file mode 100644
index 0000000000..cc96404d8b
--- /dev/null
+++ b/config/kernel-vfs-file_range.m4
@@ -0,0 +1,164 @@
+dnl #
+dnl # The *_file_range APIs have a long history:
+dnl #
+dnl # 2.6.29: BTRFS_IOC_CLONE and BTRFS_IOC_CLONE_RANGE ioctl introduced
+dnl # 3.12: BTRFS_IOC_FILE_EXTENT_SAME ioctl introduced
+dnl #
+dnl # 4.5: copy_file_range() syscall introduced, added to VFS
+dnl # 4.5: BTRFS_IOC_CLONE and BTRFS_IOC_CLONE_RANGE renamed to FICLONE ands
+dnl #      FICLONERANGE, added to VFS as clone_file_range()
+dnl # 4.5: BTRFS_IOC_FILE_EXTENT_SAME renamed to FIDEDUPERANGE, added to VFS
+dnl #      as dedupe_file_range()
+dnl #
+dnl # 4.20: VFS clone_file_range() and dedupe_file_range() replaced by
+dnl #       remap_file_range()
+dnl #
+dnl # 5.3: VFS copy_file_range() expected to do its own fallback,
+dnl #      generic_copy_file_range() added to support it
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_COPY_FILE_RANGE], [
+	ZFS_LINUX_TEST_SRC([vfs_copy_file_range], [
+		#include <linux/fs.h>
+
+		static ssize_t test_copy_file_range(struct file *src_file,
+		    loff_t src_off, struct file *dst_file, loff_t dst_off,
+		    size_t len, unsigned int flags) {
+			(void) src_file; (void) src_off;
+			(void) dst_file; (void) dst_off;
+			(void) len; (void) flags;
+			return (0);
+		}
+
+		static const struct file_operations
+		    fops __attribute__ ((unused)) = {
+			.copy_file_range	= test_copy_file_range,
+		};
+	],[])
+])
+AC_DEFUN([ZFS_AC_KERNEL_VFS_COPY_FILE_RANGE], [
+	AC_MSG_CHECKING([whether fops->copy_file_range() is available])
+	ZFS_LINUX_TEST_RESULT([vfs_copy_file_range], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_VFS_COPY_FILE_RANGE, 1,
+		    [fops->copy_file_range() is available])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_GENERIC_COPY_FILE_RANGE], [
+	ZFS_LINUX_TEST_SRC([generic_copy_file_range], [
+		#include <linux/fs.h>
+	], [
+		struct file *src_file __attribute__ ((unused)) = NULL;
+		loff_t src_off __attribute__ ((unused)) = 0;
+		struct file *dst_file __attribute__ ((unused)) = NULL;
+		loff_t dst_off __attribute__ ((unused)) = 0;
+		size_t len __attribute__ ((unused)) = 0;
+		unsigned int flags __attribute__ ((unused)) = 0;
+		generic_copy_file_range(src_file, src_off, dst_file, dst_off,
+		    len, flags);
+	])
+])
+AC_DEFUN([ZFS_AC_KERNEL_VFS_GENERIC_COPY_FILE_RANGE], [
+	AC_MSG_CHECKING([whether generic_copy_file_range() is available])
+	ZFS_LINUX_TEST_RESULT_SYMBOL([generic_copy_file_range],
+	[generic_copy_file_range], [fs/read_write.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_VFS_GENERIC_COPY_FILE_RANGE, 1,
+		    [generic_copy_file_range() is available])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_CLONE_FILE_RANGE], [
+	ZFS_LINUX_TEST_SRC([vfs_clone_file_range], [
+		#include <linux/fs.h>
+
+		static int test_clone_file_range(struct file *src_file,
+		    loff_t src_off, struct file *dst_file, loff_t dst_off,
+		    u64 len) {
+			(void) src_file; (void) src_off;
+			(void) dst_file; (void) dst_off;
+			(void) len;
+			return (0);
+		}
+
+		static const struct file_operations
+		    fops __attribute__ ((unused)) = {
+			.clone_file_range	= test_clone_file_range,
+		};
+	],[])
+])
+AC_DEFUN([ZFS_AC_KERNEL_VFS_CLONE_FILE_RANGE], [
+	AC_MSG_CHECKING([whether fops->clone_file_range() is available])
+	ZFS_LINUX_TEST_RESULT([vfs_clone_file_range], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_VFS_CLONE_FILE_RANGE, 1,
+		    [fops->clone_file_range() is available])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_DEDUPE_FILE_RANGE], [
+	ZFS_LINUX_TEST_SRC([vfs_dedupe_file_range], [
+		#include <linux/fs.h>
+
+		static int test_dedupe_file_range(struct file *src_file,
+		    loff_t src_off, struct file *dst_file, loff_t dst_off,
+		    u64 len) {
+			(void) src_file; (void) src_off;
+			(void) dst_file; (void) dst_off;
+			(void) len;
+			return (0);
+		}
+
+		static const struct file_operations
+		    fops __attribute__ ((unused)) = {
+                .dedupe_file_range	= test_dedupe_file_range,
+		};
+	],[])
+])
+AC_DEFUN([ZFS_AC_KERNEL_VFS_DEDUPE_FILE_RANGE], [
+	AC_MSG_CHECKING([whether fops->dedupe_file_range() is available])
+	ZFS_LINUX_TEST_RESULT([vfs_dedupe_file_range], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_VFS_DEDUPE_FILE_RANGE, 1,
+		    [fops->dedupe_file_range() is available])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_REMAP_FILE_RANGE], [
+	ZFS_LINUX_TEST_SRC([vfs_remap_file_range], [
+		#include <linux/fs.h>
+
+		static loff_t test_remap_file_range(struct file *src_file,
+		    loff_t src_off, struct file *dst_file, loff_t dst_off,
+		    loff_t len, unsigned int flags) {
+			(void) src_file; (void) src_off;
+			(void) dst_file; (void) dst_off;
+			(void) len; (void) flags;
+			return (0);
+		}
+
+		static const struct file_operations
+		    fops __attribute__ ((unused)) = {
+			.remap_file_range	= test_remap_file_range,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_VFS_REMAP_FILE_RANGE], [
+	AC_MSG_CHECKING([whether fops->remap_file_range() is available])
+	ZFS_LINUX_TEST_RESULT([vfs_remap_file_range], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_VFS_REMAP_FILE_RANGE, 1,
+		    [fops->remap_file_range() is available])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
diff --git a/config/kernel.m4 b/config/kernel.m4
index cb7e736c9a..1487fa2e77 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -116,6 +116,12 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_VFS_RW_ITERATE
 	ZFS_AC_KERNEL_SRC_VFS_GENERIC_WRITE_CHECKS
 	ZFS_AC_KERNEL_SRC_VFS_IOV_ITER
+	ZFS_AC_KERNEL_SRC_VFS_COPY_FILE_RANGE
+	ZFS_AC_KERNEL_SRC_VFS_GENERIC_COPY_FILE_RANGE
+	ZFS_AC_KERNEL_SRC_VFS_REMAP_FILE_RANGE
+	ZFS_AC_KERNEL_SRC_VFS_CLONE_FILE_RANGE
+	ZFS_AC_KERNEL_SRC_VFS_DEDUPE_FILE_RANGE
+	ZFS_AC_KERNEL_SRC_VFS_FILE_OPERATIONS_EXTEND
 	ZFS_AC_KERNEL_SRC_KMAP_ATOMIC_ARGS
 	ZFS_AC_KERNEL_SRC_FOLLOW_DOWN_ONE
 	ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN
@@ -249,6 +255,12 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_VFS_RW_ITERATE
 	ZFS_AC_KERNEL_VFS_GENERIC_WRITE_CHECKS
 	ZFS_AC_KERNEL_VFS_IOV_ITER
+	ZFS_AC_KERNEL_VFS_COPY_FILE_RANGE
+	ZFS_AC_KERNEL_VFS_GENERIC_COPY_FILE_RANGE
+	ZFS_AC_KERNEL_VFS_REMAP_FILE_RANGE
+	ZFS_AC_KERNEL_VFS_CLONE_FILE_RANGE
+	ZFS_AC_KERNEL_VFS_DEDUPE_FILE_RANGE
+	ZFS_AC_KERNEL_VFS_FILE_OPERATIONS_EXTEND
 	ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
 	ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
 	ZFS_AC_KERNEL_MAKE_REQUEST_FN
diff --git a/include/os/linux/zfs/sys/zpl.h b/include/os/linux/zfs/sys/zpl.h
index 579847bbf2..5d11c79101 100644
--- a/include/os/linux/zfs/sys/zpl.h
+++ b/include/os/linux/zfs/sys/zpl.h
@@ -52,7 +52,11 @@ extern const struct inode_operations zpl_special_inode_operations;
 
 /* zpl_file.c */
 extern const struct address_space_operations zpl_address_space_operations;
+#ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND
+extern const struct file_operations_extend zpl_file_operations;
+#else
 extern const struct file_operations zpl_file_operations;
+#endif
 extern const struct file_operations zpl_dir_file_operations;
 
 /* zpl_super.c */
@@ -189,6 +193,55 @@ zpl_dir_emit_dots(struct file *file, zpl_dir_context_t *ctx)
 }
 #endif /* HAVE_VFS_ITERATE */
 
+
+/* zpl_file_range.c */
+
+/* handlers for file_operations of the same name */
+extern ssize_t zpl_copy_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, size_t len, unsigned int flags);
+extern loff_t zpl_remap_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, loff_t len, unsigned int flags);
+extern int zpl_clone_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, uint64_t len);
+extern int zpl_dedupe_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, uint64_t len);
+
+/* compat for FICLONE/FICLONERANGE/FIDEDUPERANGE ioctls */
+typedef struct {
+	int64_t		fcr_src_fd;
+	uint64_t	fcr_src_offset;
+	uint64_t	fcr_src_length;
+	uint64_t	fcr_dest_offset;
+} zfs_ioc_compat_file_clone_range_t;
+
+typedef struct {
+	int64_t		fdri_dest_fd;
+	uint64_t	fdri_dest_offset;
+	uint64_t	fdri_bytes_deduped;
+	int32_t		fdri_status;
+	uint32_t	fdri_reserved;
+} zfs_ioc_compat_dedupe_range_info_t;
+
+typedef struct {
+	uint64_t	fdr_src_offset;
+	uint64_t	fdr_src_length;
+	uint16_t	fdr_dest_count;
+	uint16_t	fdr_reserved1;
+	uint32_t	fdr_reserved2;
+	zfs_ioc_compat_dedupe_range_info_t	fdr_info[];
+} zfs_ioc_compat_dedupe_range_t;
+
+#define	ZFS_IOC_COMPAT_FICLONE		_IOW(0x94, 9, int)
+#define	ZFS_IOC_COMPAT_FICLONERANGE \
+    _IOW(0x94, 13, zfs_ioc_compat_file_clone_range_t)
+#define	ZFS_IOC_COMPAT_FIDEDUPERANGE \
+    _IOWR(0x94, 54, zfs_ioc_compat_dedupe_range_t)
+
+extern long zpl_ioctl_ficlone(struct file *filp, void *arg);
+extern long zpl_ioctl_ficlonerange(struct file *filp, void *arg);
+extern long zpl_ioctl_fideduperange(struct file *filp, void *arg);
+
+
 #if defined(HAVE_INODE_TIMESTAMP_TRUNCATE)
 #define	zpl_inode_timestamp_truncate(ts, ip)	timestamp_truncate(ts, ip)
 #elif defined(HAVE_INODE_TIMESPEC64_TIMES)
diff --git a/module/Kbuild.in b/module/Kbuild.in
index cb010b7929..720663f4c0 100644
--- a/module/Kbuild.in
+++ b/module/Kbuild.in
@@ -462,6 +462,7 @@ ZFS_OBJS_OS := \
 	zpl_ctldir.o \
 	zpl_export.o \
 	zpl_file.o \
+	zpl_file_range.o \
 	zpl_inode.o \
 	zpl_super.o \
 	zpl_xattr.o \
diff --git a/module/os/linux/zfs/zfs_vfsops.c b/module/os/linux/zfs/zfs_vfsops.c
index f0075a52f4..e7b237e682 100644
--- a/module/os/linux/zfs/zfs_vfsops.c
+++ b/module/os/linux/zfs/zfs_vfsops.c
@@ -2110,6 +2110,9 @@ zfs_init(void)
 	zfs_znode_init();
 	dmu_objset_register_type(DMU_OST_ZFS, zpl_get_file_info);
 	register_filesystem(&zpl_fs_type);
+#ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND
+	register_fo_extend(&zpl_file_operations);
+#endif
 }
 
 void
@@ -2120,6 +2123,9 @@ zfs_fini(void)
 	 */
 	taskq_wait(system_delay_taskq);
 	taskq_wait(system_taskq);
+#ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND
+	unregister_fo_extend(&zpl_file_operations);
+#endif
 	unregister_filesystem(&zpl_fs_type);
 	zfs_znode_fini();
 	zfsctl_fini();
diff --git a/module/os/linux/zfs/zfs_znode.c b/module/os/linux/zfs/zfs_znode.c
index 02b1af3edc..335ae3460c 100644
--- a/module/os/linux/zfs/zfs_znode.c
+++ b/module/os/linux/zfs/zfs_znode.c
@@ -415,7 +415,11 @@ zfs_inode_set_ops(zfsvfs_t *zfsvfs, struct inode *ip)
 	switch (ip->i_mode & S_IFMT) {
 	case S_IFREG:
 		ip->i_op = &zpl_inode_operations;
+#ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND
+		ip->i_fop = &zpl_file_operations.kabi_fops;
+#else
 		ip->i_fop = &zpl_file_operations;
+#endif
 		ip->i_mapping->a_ops = &zpl_address_space_operations;
 		break;
 
@@ -455,7 +459,11 @@ zfs_inode_set_ops(zfsvfs_t *zfsvfs, struct inode *ip)
 		/* Assume the inode is a file and attempt to continue */
 		ip->i_mode = S_IFREG | 0644;
 		ip->i_op = &zpl_inode_operations;
+#ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND
+		ip->i_fop = &zpl_file_operations.kabi_fops;
+#else
 		ip->i_fop = &zpl_file_operations;
+#endif
 		ip->i_mapping->a_ops = &zpl_address_space_operations;
 		break;
 	}
diff --git a/module/os/linux/zfs/zpl_file.c b/module/os/linux/zfs/zpl_file.c
index e690525d3c..73526db731 100644
--- a/module/os/linux/zfs/zpl_file.c
+++ b/module/os/linux/zfs/zpl_file.c
@@ -1257,6 +1257,12 @@ zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return (zpl_ioctl_getdosflags(filp, (void *)arg));
 	case ZFS_IOC_SETDOSFLAGS:
 		return (zpl_ioctl_setdosflags(filp, (void *)arg));
+	case ZFS_IOC_COMPAT_FICLONE:
+		return (zpl_ioctl_ficlone(filp, (void *)arg));
+	case ZFS_IOC_COMPAT_FICLONERANGE:
+		return (zpl_ioctl_ficlonerange(filp, (void *)arg));
+	case ZFS_IOC_COMPAT_FIDEDUPERANGE:
+		return (zpl_ioctl_fideduperange(filp, (void *)arg));
 	default:
 		return (-ENOTTY);
 	}
@@ -1283,7 +1289,6 @@ zpl_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 }
 #endif /* CONFIG_COMPAT */
 
-
 const struct address_space_operations zpl_address_space_operations = {
 #ifdef HAVE_VFS_READPAGES
 	.readpages	= zpl_readpages,
@@ -1306,7 +1311,12 @@ const struct address_space_operations zpl_address_space_operations = {
 #endif
 };
 
+#ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND
+const struct file_operations_extend zpl_file_operations = {
+	.kabi_fops = {
+#else
 const struct file_operations zpl_file_operations = {
+#endif
 	.open		= zpl_open,
 	.release	= zpl_release,
 	.llseek		= zpl_llseek,
@@ -1333,6 +1343,18 @@ const struct file_operations zpl_file_operations = {
 	.aio_fsync	= zpl_aio_fsync,
 #endif
 	.fallocate	= zpl_fallocate,
+#ifdef HAVE_VFS_COPY_FILE_RANGE
+	.copy_file_range	= zpl_copy_file_range,
+#endif
+#ifdef HAVE_VFS_CLONE_FILE_RANGE
+	.clone_file_range	= zpl_clone_file_range,
+#endif
+#ifdef HAVE_VFS_REMAP_FILE_RANGE
+	.remap_file_range	= zpl_remap_file_range,
+#endif
+#ifdef HAVE_VFS_DEDUPE_FILE_RANGE
+	.dedupe_file_range	= zpl_dedupe_file_range,
+#endif
 #ifdef HAVE_FILE_FADVISE
 	.fadvise	= zpl_fadvise,
 #endif
@@ -1340,6 +1362,11 @@ const struct file_operations zpl_file_operations = {
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= zpl_compat_ioctl,
 #endif
+#ifdef HAVE_VFS_FILE_OPERATIONS_EXTEND
+	}, /* kabi_fops */
+	.copy_file_range	= zpl_copy_file_range,
+	.clone_file_range	= zpl_clone_file_range,
+#endif
 };
 
 const struct file_operations zpl_dir_file_operations = {
diff --git a/module/os/linux/zfs/zpl_file_range.c b/module/os/linux/zfs/zpl_file_range.c
new file mode 100644
index 0000000000..18efebfc1d
--- /dev/null
+++ b/module/os/linux/zfs/zpl_file_range.c
@@ -0,0 +1,264 @@
+/*
+ * 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.
+ */
+
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+#endif
+#include <linux/fs.h>
+#include <sys/file.h>
+#include <sys/zfs_znode.h>
+#include <sys/zfs_vnops.h>
+#include <sys/zfeature.h>
+
+/*
+ * Clone part of a file via block cloning.
+ *
+ * Note that we are not required to update file offsets; the kernel will take
+ * care of that depending on how it was called.
+ */
+static ssize_t
+__zpl_clone_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, size_t len)
+{
+	struct inode *src_i = file_inode(src_file);
+	struct inode *dst_i = file_inode(dst_file);
+	uint64_t src_off_o = (uint64_t)src_off;
+	uint64_t dst_off_o = (uint64_t)dst_off;
+	uint64_t len_o = (uint64_t)len;
+	cred_t *cr = CRED();
+	fstrans_cookie_t cookie;
+	int err;
+
+	if (!spa_feature_is_enabled(
+	    dmu_objset_spa(ITOZSB(dst_i)->z_os), SPA_FEATURE_BLOCK_CLONING))
+		return (-EOPNOTSUPP);
+
+	if (src_i != dst_i)
+		spl_inode_lock_shared(src_i);
+	spl_inode_lock(dst_i);
+
+	crhold(cr);
+	cookie = spl_fstrans_mark();
+
+	err = -zfs_clone_range(ITOZ(src_i), &src_off_o, ITOZ(dst_i),
+	    &dst_off_o, &len_o, cr);
+
+	spl_fstrans_unmark(cookie);
+	crfree(cr);
+
+	spl_inode_unlock(dst_i);
+	if (src_i != dst_i)
+		spl_inode_unlock_shared(src_i);
+
+	if (err < 0)
+		return (err);
+
+	return ((ssize_t)len_o);
+}
+
+#if defined(HAVE_VFS_COPY_FILE_RANGE) || \
+    defined(HAVE_VFS_FILE_OPERATIONS_EXTEND)
+/*
+ * Entry point for copy_file_range(). Copy len bytes from src_off in src_file
+ * to dst_off in dst_file. We are permitted to do this however we like, so we
+ * try to just clone the blocks, and if we can't support it, fall back to the
+ * kernel's generic byte copy function.
+ */
+ssize_t
+zpl_copy_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, size_t len, unsigned int flags)
+{
+	ssize_t ret;
+
+	if (flags != 0)
+		return (-EINVAL);
+
+	/* Try to do it via zfs_clone_range() */
+	ret = __zpl_clone_file_range(src_file, src_off,
+	    dst_file, dst_off, len);
+
+#ifdef HAVE_VFS_GENERIC_COPY_FILE_RANGE
+	/*
+	 * Since Linux 5.3 the filesystem driver is responsible for executing
+	 * an appropriate fallback, and a generic fallback function is provided.
+	 */
+	if (ret == -EOPNOTSUPP || ret == -EXDEV)
+		ret = generic_copy_file_range(src_file, src_off, dst_file,
+		    dst_off, len, flags);
+#endif /* HAVE_VFS_GENERIC_COPY_FILE_RANGE */
+
+	return (ret);
+}
+#endif /* HAVE_VFS_COPY_FILE_RANGE || HAVE_VFS_FILE_OPERATIONS_EXTEND */
+
+#ifdef HAVE_VFS_REMAP_FILE_RANGE
+/*
+ * Entry point for FICLONE/FICLONERANGE/FIDEDUPERANGE.
+ *
+ * FICLONE and FICLONERANGE are basically the same as copy_file_range(), except
+ * that they must clone - they cannot fall back to copying. FICLONE is exactly
+ * FICLONERANGE, for the entire file. We don't need to try to tell them apart;
+ * the kernel will sort that out for us.
+ *
+ * FIDEDUPERANGE is for turning a non-clone into a clone, that is, compare the
+ * range in both files and if they're the same, arrange for them to be backed
+ * by the same storage.
+ */
+loff_t
+zpl_remap_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, loff_t len, unsigned int flags)
+{
+	if (flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_CAN_SHORTEN))
+		return (-EINVAL);
+
+	/*
+	 * REMAP_FILE_CAN_SHORTEN lets us know we can clone less than the given
+	 * range if we want. Its designed for filesystems that make data past
+	 * EOF available, and don't want it to be visible in both files. ZFS
+	 * doesn't do that, so we just turn the flag off.
+	 */
+	flags &= ~REMAP_FILE_CAN_SHORTEN;
+
+	if (flags & REMAP_FILE_DEDUP)
+		/* No support for dedup yet */
+		return (-EOPNOTSUPP);
+
+	/* Zero length means to clone everything to the end of the file */
+	if (len == 0)
+		len = i_size_read(file_inode(src_file)) - src_off;
+
+	return (__zpl_clone_file_range(src_file, src_off,
+	    dst_file, dst_off, len));
+}
+#endif /* HAVE_VFS_REMAP_FILE_RANGE */
+
+#if defined(HAVE_VFS_CLONE_FILE_RANGE) || \
+    defined(HAVE_VFS_FILE_OPERATIONS_EXTEND)
+/*
+ * Entry point for FICLONE and FICLONERANGE, before Linux 4.20.
+ */
+int
+zpl_clone_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, uint64_t len)
+{
+	/* Zero length means to clone everything to the end of the file */
+	if (len == 0)
+		len = i_size_read(file_inode(src_file)) - src_off;
+
+	return (__zpl_clone_file_range(src_file, src_off,
+	    dst_file, dst_off, len));
+}
+#endif /* HAVE_VFS_CLONE_FILE_RANGE || HAVE_VFS_FILE_OPERATIONS_EXTEND */
+
+#ifdef HAVE_VFS_DEDUPE_FILE_RANGE
+/*
+ * Entry point for FIDEDUPERANGE, before Linux 4.20.
+ */
+int
+zpl_dedupe_file_range(struct file *src_file, loff_t src_off,
+    struct file *dst_file, loff_t dst_off, uint64_t len)
+{
+	/* No support for dedup yet */
+	return (-EOPNOTSUPP);
+}
+#endif /* HAVE_VFS_DEDUPE_FILE_RANGE */
+
+/* Entry point for FICLONE, before Linux 4.5. */
+long
+zpl_ioctl_ficlone(struct file *dst_file, void *arg)
+{
+	unsigned long sfd = (unsigned long)arg;
+
+	struct file *src_file = fget(sfd);
+	if (src_file == NULL)
+		return (-EBADF);
+
+	if (dst_file->f_op != src_file->f_op)
+		return (-EXDEV);
+
+	size_t len = i_size_read(file_inode(src_file));
+
+	ssize_t ret =
+	    __zpl_clone_file_range(src_file, 0, dst_file, 0, len);
+
+	fput(src_file);
+
+	if (ret < 0) {
+		if (ret == -EOPNOTSUPP)
+			return (-ENOTTY);
+		return (ret);
+	}
+
+	if (ret != len)
+		return (-EINVAL);
+
+	return (0);
+}
+
+/* Entry point for FICLONERANGE, before Linux 4.5. */
+long
+zpl_ioctl_ficlonerange(struct file *dst_file, void __user *arg)
+{
+	zfs_ioc_compat_file_clone_range_t fcr;
+
+	if (copy_from_user(&fcr, arg, sizeof (fcr)))
+		return (-EFAULT);
+
+	struct file *src_file = fget(fcr.fcr_src_fd);
+	if (src_file == NULL)
+		return (-EBADF);
+
+	if (dst_file->f_op != src_file->f_op)
+		return (-EXDEV);
+
+	size_t len = fcr.fcr_src_length;
+	if (len == 0)
+		len = i_size_read(file_inode(src_file)) - fcr.fcr_src_offset;
+
+	ssize_t ret = __zpl_clone_file_range(src_file, fcr.fcr_src_offset,
+	    dst_file, fcr.fcr_dest_offset, len);
+
+	fput(src_file);
+
+	if (ret < 0) {
+		if (ret == -EOPNOTSUPP)
+			return (-ENOTTY);
+		return (ret);
+	}
+
+	if (ret != len)
+		return (-EINVAL);
+
+	return (0);
+}
+
+/* Entry point for FIDEDUPERANGE, before Linux 4.5. */
+long
+zpl_ioctl_fideduperange(struct file *filp, void *arg)
+{
+	(void) arg;
+
+	/* No support for dedup yet */
+	return (-ENOTTY);
+}
diff --git a/module/zfs/brt.c b/module/zfs/brt.c
index 99bd472d6f..877b503a1b 100644
--- a/module/zfs/brt.c
+++ b/module/zfs/brt.c
@@ -680,7 +680,7 @@ brt_vdev_realloc(brt_t *brt, brt_vdev_t *brtvd)
 	size = (vdev_get_min_asize(vd) - 1) / brt->brt_rangesize + 1;
 	spa_config_exit(brt->brt_spa, SCL_VDEV, FTAG);
 
-	entcount = kmem_zalloc(sizeof (entcount[0]) * size, KM_SLEEP);
+	entcount = vmem_zalloc(sizeof (entcount[0]) * size, KM_SLEEP);
 	nblocks = BRT_RANGESIZE_TO_NBLOCKS(size);
 	bitmap = kmem_zalloc(BT_SIZEOFMAP(nblocks), KM_SLEEP);
 
@@ -709,7 +709,7 @@ brt_vdev_realloc(brt_t *brt, brt_vdev_t *brtvd)
 		    sizeof (entcount[0]) * MIN(size, brtvd->bv_size));
 		memcpy(bitmap, brtvd->bv_bitmap, MIN(BT_SIZEOFMAP(nblocks),
 		    BT_SIZEOFMAP(brtvd->bv_nblocks)));
-		kmem_free(brtvd->bv_entcount,
+		vmem_free(brtvd->bv_entcount,
 		    sizeof (entcount[0]) * brtvd->bv_size);
 		kmem_free(brtvd->bv_bitmap, BT_SIZEOFMAP(brtvd->bv_nblocks));
 	}
@@ -792,7 +792,7 @@ brt_vdev_dealloc(brt_t *brt, brt_vdev_t *brtvd)
 	ASSERT(RW_WRITE_HELD(&brt->brt_lock));
 	ASSERT(brtvd->bv_initiated);
 
-	kmem_free(brtvd->bv_entcount, sizeof (uint16_t) * brtvd->bv_size);
+	vmem_free(brtvd->bv_entcount, sizeof (uint16_t) * brtvd->bv_size);
 	brtvd->bv_entcount = NULL;
 	kmem_free(brtvd->bv_bitmap, BT_SIZEOFMAP(brtvd->bv_nblocks));
 	brtvd->bv_bitmap = NULL;
diff --git a/module/zfs/dbuf.c b/module/zfs/dbuf.c
index 1ea075217f..b7453578a7 100644
--- a/module/zfs/dbuf.c
+++ b/module/zfs/dbuf.c
@@ -2701,7 +2701,7 @@ dmu_buf_will_clone(dmu_buf_t *db_fake, dmu_tx_t *tx)
 	 */
 	mutex_enter(&db->db_mtx);
 	VERIFY(!dbuf_undirty(db, tx));
-	ASSERT(list_head(&db->db_dirty_records) == NULL);
+	ASSERT0(dbuf_find_dirty_eq(db, tx->tx_txg));
 	if (db->db_buf != NULL) {
 		arc_buf_destroy(db->db_buf, db);
 		db->db_buf = NULL;
@@ -4457,6 +4457,15 @@ dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx)
 	} else if (db->db_state == DB_FILL) {
 		/* This buffer was freed and is now being re-filled */
 		ASSERT(db->db.db_data != dr->dt.dl.dr_data);
+	} else if (db->db_state == DB_READ) {
+		/*
+		 * This buffer has a clone we need to write, and an in-flight
+		 * read on the BP we're about to clone. Its safe to issue the
+		 * write here because the read has already been issued and the
+		 * contents won't change.
+		 */
+		ASSERT(dr->dt.dl.dr_brtwrite &&
+		    dr->dt.dl.dr_override_state == DR_OVERRIDDEN);
 	} else {
 		ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL);
 	}
diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c
index 7bdcc16393..3ebd2d0ff7 100644
--- a/module/zfs/zfs_vnops.c
+++ b/module/zfs/zfs_vnops.c
@@ -1212,7 +1212,7 @@ zfs_clone_range(znode_t *inzp, uint64_t *inoffp, znode_t *outzp,
 	gid = KGID_TO_SGID(ZTOGID(outzp));
 	projid = outzp->z_projid;
 
-	bps = kmem_alloc(sizeof (bps[0]) * maxblocks, KM_SLEEP);
+	bps = vmem_alloc(sizeof (bps[0]) * maxblocks, KM_SLEEP);
 
 	/*
 	 * Clone the file in reasonable size chunks.  Each chunk is cloned
@@ -1330,7 +1330,7 @@ zfs_clone_range(znode_t *inzp, uint64_t *inoffp, znode_t *outzp,
 		done += size;
 	}
 
-	kmem_free(bps, sizeof (bps[0]) * maxblocks);
+	vmem_free(bps, sizeof (bps[0]) * maxblocks);
 	zfs_znode_update_vfs(outzp);
 
 unlock:
diff --git a/module/zfs/zil.c b/module/zfs/zil.c
index 00d66a2481..be5b9edf6e 100644
--- a/module/zfs/zil.c
+++ b/module/zfs/zil.c
@@ -151,6 +151,7 @@ static kmem_cache_t *zil_lwb_cache;
 static kmem_cache_t *zil_zcw_cache;
 
 static void zil_lwb_commit(zilog_t *zilog, lwb_t *lwb, itx_t *itx);
+static void zil_lwb_write_issue(zilog_t *zilog, lwb_t *lwb);
 static itx_t *zil_itx_clone(itx_t *oitx);
 
 static int
@@ -1768,7 +1769,7 @@ static uint_t zil_maxblocksize = SPA_OLD_MAXBLOCKSIZE;
  * Has to be called under zl_issuer_lock to chain more lwbs.
  */
 static lwb_t *
-zil_lwb_write_close(zilog_t *zilog, lwb_t *lwb)
+zil_lwb_write_close(zilog_t *zilog, lwb_t *lwb, list_t *ilwbs)
 {
 	lwb_t *nlwb = NULL;
 	zil_chain_t *zilc;
@@ -1870,6 +1871,27 @@ zil_lwb_write_close(zilog_t *zilog, lwb_t *lwb)
 
 	dmu_tx_commit(tx);
 
+	/*
+	 * We need to acquire the config lock for the lwb to issue it later.
+	 * However, if we already have a queue of closed parent lwbs already
+	 * holding the config lock (but not yet issued), we can't block here
+	 * waiting on the lock or we will deadlock.  In that case we must
+	 * first issue to parent IOs before waiting on the lock.
+	 */
+	if (ilwbs && !list_is_empty(ilwbs)) {
+		if (!spa_config_tryenter(spa, SCL_STATE, lwb, RW_READER)) {
+			lwb_t *tlwb;
+			while ((tlwb = list_remove_head(ilwbs)) != NULL)
+				zil_lwb_write_issue(zilog, tlwb);
+			spa_config_enter(spa, SCL_STATE, lwb, RW_READER);
+		}
+	} else {
+		spa_config_enter(spa, SCL_STATE, lwb, RW_READER);
+	}
+
+	if (ilwbs)
+		list_insert_tail(ilwbs, lwb);
+
 	/*
 	 * If there was an allocation failure then nlwb will be null which
 	 * forces a txg_wait_synced().
@@ -1933,7 +1955,7 @@ zil_lwb_write_issue(zilog_t *zilog, lwb_t *lwb)
 		ZIL_STAT_INCR(zilog, zil_itx_metaslab_normal_alloc,
 		    BP_GET_LSIZE(&lwb->lwb_blk));
 	}
-	spa_config_enter(zilog->zl_spa, SCL_STATE, lwb, RW_READER);
+	ASSERT(spa_config_held(zilog->zl_spa, SCL_STATE, RW_READER));
 	zil_lwb_add_block(lwb, &lwb->lwb_blk);
 	lwb->lwb_issued_timestamp = gethrtime();
 	zio_nowait(lwb->lwb_root_zio);
@@ -2037,8 +2059,7 @@ cont:
 	    lwb_sp < zil_max_waste_space(zilog) &&
 	    (dlen % max_log_data == 0 ||
 	    lwb_sp < reclen + dlen % max_log_data))) {
-		list_insert_tail(ilwbs, lwb);
-		lwb = zil_lwb_write_close(zilog, lwb);
+		lwb = zil_lwb_write_close(zilog, lwb, ilwbs);
 		if (lwb == NULL)
 			return (NULL);
 		zil_lwb_write_open(zilog, lwb);
@@ -2937,8 +2958,7 @@ zil_process_commit_list(zilog_t *zilog, zil_commit_waiter_t *zcw, list_t *ilwbs)
 			    zfs_commit_timeout_pct / 100;
 			if (sleep < zil_min_commit_timeout ||
 			    lwb->lwb_sz - lwb->lwb_nused < lwb->lwb_sz / 8) {
-				list_insert_tail(ilwbs, lwb);
-				lwb = zil_lwb_write_close(zilog, lwb);
+				lwb = zil_lwb_write_close(zilog, lwb, ilwbs);
 				zilog->zl_cur_used = 0;
 				if (lwb == NULL) {
 					while ((lwb = list_remove_head(ilwbs))
@@ -3096,7 +3116,7 @@ zil_commit_waiter_timeout(zilog_t *zilog, zil_commit_waiter_t *zcw)
 	 * since we've reached the commit waiter's timeout and it still
 	 * hasn't been issued.
 	 */
-	lwb_t *nlwb = zil_lwb_write_close(zilog, lwb);
+	lwb_t *nlwb = zil_lwb_write_close(zilog, lwb, NULL);
 
 	ASSERT3S(lwb->lwb_state, !=, LWB_STATE_OPENED);
 
@@ -3921,13 +3941,11 @@ zil_suspend(const char *osname, void **cookiep)
 		return (error);
 	zilog = dmu_objset_zil(os);
 
-	mutex_enter(&zilog->zl_issuer_lock);
 	mutex_enter(&zilog->zl_lock);
 	zh = zilog->zl_header;
 
 	if (zh->zh_flags & ZIL_REPLAY_NEEDED) {		/* unplayed log */
 		mutex_exit(&zilog->zl_lock);
-		mutex_exit(&zilog->zl_issuer_lock);
 		dmu_objset_rele(os, suspend_tag);
 		return (SET_ERROR(EBUSY));
 	}
@@ -3941,7 +3959,6 @@ zil_suspend(const char *osname, void **cookiep)
 	if (cookiep == NULL && !zilog->zl_suspending &&
 	    (zilog->zl_suspend > 0 || BP_IS_HOLE(&zh->zh_log))) {
 		mutex_exit(&zilog->zl_lock);
-		mutex_exit(&zilog->zl_issuer_lock);
 		dmu_objset_rele(os, suspend_tag);
 		return (0);
 	}
@@ -3950,7 +3967,6 @@ zil_suspend(const char *osname, void **cookiep)
 	dsl_pool_rele(dmu_objset_pool(os), suspend_tag);
 
 	zilog->zl_suspend++;
-	mutex_exit(&zilog->zl_issuer_lock);
 
 	if (zilog->zl_suspend > 1) {
 		/*
diff --git a/tests/runfiles/linux.run b/tests/runfiles/linux.run
index 618eeb9340..b68202d849 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 cf438e0e64..c9a2b4179a 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 f68f580728..5f53b68719 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 066abb6ce3..9bdb3c2097 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 0000000000..a7e7277ae4
--- /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 b3cfe149ff..fa545e06bb 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 ff65dc1ac2..0819cb6b57 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 0000000000..9998e5a87b
--- /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 0000000000..9adcbfcd88
--- /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 0000000000..07e089e89c
--- /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 0000000000..ecac62b203
--- /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 0000000000..30b155a140
--- /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 0000000000..10a2715ea2
--- /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 0000000000..e8461e6d3c
--- /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 0000000000..d13a392298
--- /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 0000000000..6556050c43
--- /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 0000000000..37a3511a26
--- /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 0000000000..7ac13adb63
--- /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 0000000000..512f5a0644
--- /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