FreeBSD: zfs commands backward compatibility

Update the zfs commands such that they're backwards compatible with
the version of ZFS is the base FreeBSD.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Ryan Moeller <[email protected]>
Signed-off-by: Matt Macy <[email protected]>
Closes #10542 

2 files changed, 372 insertions, 32 deletions

diff --git a/module/os/freebsd/zfs/kmod_core.c b/module/os/freebsd/zfs/kmod_core.c
index 4a4f55ea6..e6eceacb2 100644
--- a/module/os/freebsd/zfs/kmod_core.c
+++ b/module/os/freebsd/zfs/kmod_core.c
@@ -99,7 +99,7 @@ SYSCTL_DECL(_vfs_zfs);
 SYSCTL_DECL(_vfs_zfs_vdev);
 
 
-static int zfs_version_ioctl = ZFS_IOCVER_ZOF;
+static int zfs_version_ioctl = ZFS_IOCVER_OZFS;
 SYSCTL_DECL(_vfs_zfs_version);
 SYSCTL_INT(_vfs_zfs_version, OID_AUTO, ioctl, CTLFLAG_RD, &zfs_version_ioctl,
     0, "ZFS_IOCTL_VERSION");
@@ -121,37 +121,13 @@ extern zfsdev_state_t *zfsdev_state_list;
 
 #define	ZFS_MIN_KSTACK_PAGES 4
 
-static void
-zfs_cmd_bsd12_to_zof(zfs_cmd_legacy_t *src, zfs_cmd_t *dst)
-{
-	memcpy(dst, src, offsetof(zfs_cmd_t, zc_objset_stats));
-	*&dst->zc_objset_stats = *&src->zc_objset_stats;
-	memcpy(&dst->zc_begin_record, &src->zc_begin_record,
-	    offsetof(zfs_cmd_t, zc_sendobj) -
-	    offsetof(zfs_cmd_t, zc_begin_record));
-	memcpy(&dst->zc_sendobj, &src->zc_sendobj,
-	    sizeof (zfs_cmd_t) - 8 - offsetof(zfs_cmd_t, zc_sendobj));
-	dst->zc_zoneid = src->zc_jailid;
-}
-
-static void
-zfs_cmd_zof_to_bsd12(zfs_cmd_t *src, zfs_cmd_legacy_t *dst)
-{
-	memcpy(dst, src, offsetof(zfs_cmd_t, zc_objset_stats));
-	*&dst->zc_objset_stats = *&src->zc_objset_stats;
-	memcpy(&dst->zc_begin_record, &src->zc_begin_record,
-	    offsetof(zfs_cmd_t, zc_sendobj) -
-	    offsetof(zfs_cmd_t, zc_begin_record));
-	memcpy(&dst->zc_sendobj, &src->zc_sendobj,
-	    sizeof (zfs_cmd_t) - 8 - offsetof(zfs_cmd_t, zc_sendobj));
-	dst->zc_jailid = src->zc_zoneid;
-}
 
 static int
 zfsdev_ioctl(struct cdev *dev, ulong_t zcmd, caddr_t arg, int flag,
     struct thread *td)
 {
-	uint_t len, vecnum;
+	uint_t len;
+	int vecnum;
 	zfs_iocparm_t *zp;
 	zfs_cmd_t *zc;
 	zfs_cmd_legacy_t *zcl;
@@ -175,25 +151,25 @@ zfsdev_ioctl(struct cdev *dev, ulong_t zcmd, caddr_t arg, int flag,
 	/*
 	 * Remap ioctl code for legacy user binaries
 	 */
-	if (zp->zfs_ioctl_version == ZFS_IOCVER_FREEBSD) {
-		if (vecnum >= sizeof (zfs_ioctl_bsd12_to_zof)/sizeof (long)) {
+	if (zp->zfs_ioctl_version == ZFS_IOCVER_LEGACY) {
+		vecnum = zfs_ioctl_legacy_to_ozfs(vecnum);
+		if (vecnum < 0) {
 			kmem_free(zc, sizeof (zfs_cmd_t));
 			return (ENOTSUP);
 		}
 		zcl = kmem_zalloc(sizeof (zfs_cmd_legacy_t), KM_SLEEP);
-		vecnum = zfs_ioctl_bsd12_to_zof[vecnum];
 		if (copyin(uaddr, zcl, sizeof (zfs_cmd_legacy_t))) {
 			error = SET_ERROR(EFAULT);
 			goto out;
 		}
-		zfs_cmd_bsd12_to_zof(zcl, zc);
+		zfs_cmd_legacy_to_ozfs(zcl, zc);
 	} else if (copyin(uaddr, zc, sizeof (zfs_cmd_t))) {
 		error = SET_ERROR(EFAULT);
 		goto out;
 	}
 	error = zfsdev_ioctl_common(vecnum, zc, 0);
 	if (zcl) {
-		zfs_cmd_zof_to_bsd12(zc, zcl);
+		zfs_cmd_ozfs_to_legacy(zc, zcl);
 		rc = copyout(zcl, uaddr, sizeof (*zcl));
 	} else {
 		rc = copyout(zc, uaddr, sizeof (*zc));
diff --git a/module/os/freebsd/zfs/zfs_ioctl_compat.c b/module/os/freebsd/zfs/zfs_ioctl_compat.c
new file mode 100644
index 000000000..18ab58756
--- /dev/null
+++ b/module/os/freebsd/zfs/zfs_ioctl_compat.c
@@ -0,0 +1,364 @@
+/*
+ * Copyright (c) 2020 iXsystems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/eventhandler.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/errno.h>
+#include <sys/uio.h>
+#include <sys/cmn_err.h>
+#include <sys/stat.h>
+#include <sys/zfs_ioctl_compat.h>
+
+enum zfs_ioc_legacy {
+	ZFS_IOC_LEGACY_NONE =	-1,
+	ZFS_IOC_LEGACY_FIRST =	0,
+	ZFS_LEGACY_IOC = ZFS_IOC_LEGACY_FIRST,
+	ZFS_IOC_LEGACY_POOL_CREATE = ZFS_IOC_LEGACY_FIRST,
+	ZFS_IOC_LEGACY_POOL_DESTROY,
+	ZFS_IOC_LEGACY_POOL_IMPORT,
+	ZFS_IOC_LEGACY_POOL_EXPORT,
+	ZFS_IOC_LEGACY_POOL_CONFIGS,
+	ZFS_IOC_LEGACY_POOL_STATS,
+	ZFS_IOC_LEGACY_POOL_TRYIMPORT,
+	ZFS_IOC_LEGACY_POOL_SCAN,
+	ZFS_IOC_LEGACY_POOL_FREEZE,
+	ZFS_IOC_LEGACY_POOL_UPGRADE,
+	ZFS_IOC_LEGACY_POOL_GET_HISTORY,
+	ZFS_IOC_LEGACY_VDEV_ADD,
+	ZFS_IOC_LEGACY_VDEV_REMOVE,
+	ZFS_IOC_LEGACY_VDEV_SET_STATE,
+	ZFS_IOC_LEGACY_VDEV_ATTACH,
+	ZFS_IOC_LEGACY_VDEV_DETACH,
+	ZFS_IOC_LEGACY_VDEV_SETPATH,
+	ZFS_IOC_LEGACY_VDEV_SETFRU,
+	ZFS_IOC_LEGACY_OBJSET_STATS,
+	ZFS_IOC_LEGACY_OBJSET_ZPLPROPS,
+	ZFS_IOC_LEGACY_DATASET_LIST_NEXT,
+	ZFS_IOC_LEGACY_SNAPSHOT_LIST_NEXT,
+	ZFS_IOC_LEGACY_SET_PROP,
+	ZFS_IOC_LEGACY_CREATE,
+	ZFS_IOC_LEGACY_DESTROY,
+	ZFS_IOC_LEGACY_ROLLBACK,
+	ZFS_IOC_LEGACY_RENAME,
+	ZFS_IOC_LEGACY_RECV,
+	ZFS_IOC_LEGACY_SEND,
+	ZFS_IOC_LEGACY_INJECT_FAULT,
+	ZFS_IOC_LEGACY_CLEAR_FAULT,
+	ZFS_IOC_LEGACY_INJECT_LIST_NEXT,
+	ZFS_IOC_LEGACY_ERROR_LOG,
+	ZFS_IOC_LEGACY_CLEAR,
+	ZFS_IOC_LEGACY_PROMOTE,
+	ZFS_IOC_LEGACY_DESTROY_SNAPS,
+	ZFS_IOC_LEGACY_SNAPSHOT,
+	ZFS_IOC_LEGACY_DSOBJ_TO_DSNAME,
+	ZFS_IOC_LEGACY_OBJ_TO_PATH,
+	ZFS_IOC_LEGACY_POOL_SET_PROPS,
+	ZFS_IOC_LEGACY_POOL_GET_PROPS,
+	ZFS_IOC_LEGACY_SET_FSACL,
+	ZFS_IOC_LEGACY_GET_FSACL,
+	ZFS_IOC_LEGACY_SHARE,
+	ZFS_IOC_LEGACY_INHERIT_PROP,
+	ZFS_IOC_LEGACY_SMB_ACL,
+	ZFS_IOC_LEGACY_USERSPACE_ONE,
+	ZFS_IOC_LEGACY_USERSPACE_MANY,
+	ZFS_IOC_LEGACY_USERSPACE_UPGRADE,
+	ZFS_IOC_LEGACY_HOLD,
+	ZFS_IOC_LEGACY_RELEASE,
+	ZFS_IOC_LEGACY_GET_HOLDS,
+	ZFS_IOC_LEGACY_OBJSET_RECVD_PROPS,
+	ZFS_IOC_LEGACY_VDEV_SPLIT,
+	ZFS_IOC_LEGACY_NEXT_OBJ,
+	ZFS_IOC_LEGACY_DIFF,
+	ZFS_IOC_LEGACY_TMP_SNAPSHOT,
+	ZFS_IOC_LEGACY_OBJ_TO_STATS,
+	ZFS_IOC_LEGACY_JAIL,
+	ZFS_IOC_LEGACY_UNJAIL,
+	ZFS_IOC_LEGACY_POOL_REGUID,
+	ZFS_IOC_LEGACY_SPACE_WRITTEN,
+	ZFS_IOC_LEGACY_SPACE_SNAPS,
+	ZFS_IOC_LEGACY_SEND_PROGRESS,
+	ZFS_IOC_LEGACY_POOL_REOPEN,
+	ZFS_IOC_LEGACY_LOG_HISTORY,
+	ZFS_IOC_LEGACY_SEND_NEW,
+	ZFS_IOC_LEGACY_SEND_SPACE,
+	ZFS_IOC_LEGACY_CLONE,
+	ZFS_IOC_LEGACY_BOOKMARK,
+	ZFS_IOC_LEGACY_GET_BOOKMARKS,
+	ZFS_IOC_LEGACY_DESTROY_BOOKMARKS,
+	ZFS_IOC_LEGACY_NEXTBOOT,
+	ZFS_IOC_LEGACY_CHANNEL_PROGRAM,
+	ZFS_IOC_LEGACY_REMAP,
+	ZFS_IOC_LEGACY_POOL_CHECKPOINT,
+	ZFS_IOC_LEGACY_POOL_DISCARD_CHECKPOINT,
+	ZFS_IOC_LEGACY_POOL_INITIALIZE,
+	ZFS_IOC_LEGACY_POOL_SYNC,
+	ZFS_IOC_LEGACY_LAST
+};
+
+unsigned static long zfs_ioctl_legacy_to_ozfs_[] = {
+	ZFS_IOC_POOL_CREATE,			/* 0x00 */
+	ZFS_IOC_POOL_DESTROY,			/* 0x01 */
+	ZFS_IOC_POOL_IMPORT,			/* 0x02 */
+	ZFS_IOC_POOL_EXPORT,			/* 0x03 */
+	ZFS_IOC_POOL_CONFIGS,			/* 0x04 */
+	ZFS_IOC_POOL_STATS,			/* 0x05 */
+	ZFS_IOC_POOL_TRYIMPORT,			/* 0x06 */
+	ZFS_IOC_POOL_SCAN,			/* 0x07 */
+	ZFS_IOC_POOL_FREEZE,			/* 0x08 */
+	ZFS_IOC_POOL_UPGRADE,			/* 0x09 */
+	ZFS_IOC_POOL_GET_HISTORY,		/* 0x0a */
+	ZFS_IOC_VDEV_ADD,			/* 0x0b */
+	ZFS_IOC_VDEV_REMOVE,			/* 0x0c */
+	ZFS_IOC_VDEV_SET_STATE,			/* 0x0d */
+	ZFS_IOC_VDEV_ATTACH,			/* 0x0e */
+	ZFS_IOC_VDEV_DETACH,			/* 0x0f */
+	ZFS_IOC_VDEV_SETPATH,			/* 0x10 */
+	ZFS_IOC_VDEV_SETFRU,			/* 0x11 */
+	ZFS_IOC_OBJSET_STATS,			/* 0x12 */
+	ZFS_IOC_OBJSET_ZPLPROPS,		/* 0x13 */
+	ZFS_IOC_DATASET_LIST_NEXT,		/* 0x14 */
+	ZFS_IOC_SNAPSHOT_LIST_NEXT,		/* 0x15 */
+	ZFS_IOC_SET_PROP,			/* 0x16 */
+	ZFS_IOC_CREATE,				/* 0x17 */
+	ZFS_IOC_DESTROY,			/* 0x18 */
+	ZFS_IOC_ROLLBACK,			/* 0x19 */
+	ZFS_IOC_RENAME,				/* 0x1a */
+	ZFS_IOC_RECV,				/* 0x1b */
+	ZFS_IOC_SEND,				/* 0x1c */
+	ZFS_IOC_INJECT_FAULT,			/* 0x1d */
+	ZFS_IOC_CLEAR_FAULT,			/* 0x1e */
+	ZFS_IOC_INJECT_LIST_NEXT,		/* 0x1f */
+	ZFS_IOC_ERROR_LOG,			/* 0x20 */
+	ZFS_IOC_CLEAR,				/* 0x21 */
+	ZFS_IOC_PROMOTE,			/* 0x22 */
+	/* start of mismatch */
+
+	ZFS_IOC_DESTROY_SNAPS,			/* 0x23:0x3b */
+	ZFS_IOC_SNAPSHOT,			/* 0x24:0x23 */
+	ZFS_IOC_DSOBJ_TO_DSNAME,		/* 0x25:0x24 */
+	ZFS_IOC_OBJ_TO_PATH,			/* 0x26:0x25 */
+	ZFS_IOC_POOL_SET_PROPS,			/* 0x27:0x26 */
+	ZFS_IOC_POOL_GET_PROPS,			/* 0x28:0x27 */
+	ZFS_IOC_SET_FSACL,			/* 0x29:0x28 */
+	ZFS_IOC_GET_FSACL,			/* 0x30:0x29 */
+	ZFS_IOC_SHARE,				/* 0x2b:0x2a */
+	ZFS_IOC_INHERIT_PROP,			/* 0x2c:0x2b */
+	ZFS_IOC_SMB_ACL,			/* 0x2d:0x2c */
+	ZFS_IOC_USERSPACE_ONE,			/* 0x2e:0x2d */
+	ZFS_IOC_USERSPACE_MANY,			/* 0x2f:0x2e */
+	ZFS_IOC_USERSPACE_UPGRADE,		/* 0x30:0x2f */
+	ZFS_IOC_HOLD,				/* 0x31:0x30 */
+	ZFS_IOC_RELEASE,			/* 0x32:0x31 */
+	ZFS_IOC_GET_HOLDS,			/* 0x33:0x32 */
+	ZFS_IOC_OBJSET_RECVD_PROPS,		/* 0x34:0x33 */
+	ZFS_IOC_VDEV_SPLIT,			/* 0x35:0x34 */
+	ZFS_IOC_NEXT_OBJ,			/* 0x36:0x35 */
+	ZFS_IOC_DIFF,				/* 0x37:0x36 */
+	ZFS_IOC_TMP_SNAPSHOT,			/* 0x38:0x37 */
+	ZFS_IOC_OBJ_TO_STATS,			/* 0x39:0x38 */
+	ZFS_IOC_JAIL,			/* 0x3a:0xc2 */
+	ZFS_IOC_UNJAIL,			/* 0x3b:0xc3 */
+	ZFS_IOC_POOL_REGUID,			/* 0x3c:0x3c */
+	ZFS_IOC_SPACE_WRITTEN,			/* 0x3d:0x39 */
+	ZFS_IOC_SPACE_SNAPS,			/* 0x3e:0x3a */
+	ZFS_IOC_SEND_PROGRESS,			/* 0x3f:0x3e */
+	ZFS_IOC_POOL_REOPEN,			/* 0x40:0x3d */
+	ZFS_IOC_LOG_HISTORY,			/* 0x41:0x3f */
+	ZFS_IOC_SEND_NEW,			/* 0x42:0x40 */
+	ZFS_IOC_SEND_SPACE,			/* 0x43:0x41 */
+	ZFS_IOC_CLONE,				/* 0x44:0x42 */
+	ZFS_IOC_BOOKMARK,			/* 0x45:0x43 */
+	ZFS_IOC_GET_BOOKMARKS,			/* 0x46:0x44 */
+	ZFS_IOC_DESTROY_BOOKMARKS,		/* 0x47:0x45 */
+	ZFS_IOC_NEXTBOOT,			/* 0x48:0xc1 */
+	ZFS_IOC_CHANNEL_PROGRAM,		/* 0x49:0x48 */
+	ZFS_IOC_REMAP,				/* 0x4a:0x4c */
+	ZFS_IOC_POOL_CHECKPOINT,		/* 0x4b:0x4d */
+	ZFS_IOC_POOL_DISCARD_CHECKPOINT,	/* 0x4c:0x4e */
+	ZFS_IOC_POOL_INITIALIZE,		/* 0x4d:0x4f */
+};
+
+unsigned static long zfs_ioctl_ozfs_to_legacy_common_[] = {
+	ZFS_IOC_POOL_CREATE,			/* 0x00 */
+	ZFS_IOC_POOL_DESTROY,			/* 0x01 */
+	ZFS_IOC_POOL_IMPORT,			/* 0x02 */
+	ZFS_IOC_POOL_EXPORT,			/* 0x03 */
+	ZFS_IOC_POOL_CONFIGS,			/* 0x04 */
+	ZFS_IOC_POOL_STATS,			/* 0x05 */
+	ZFS_IOC_POOL_TRYIMPORT,			/* 0x06 */
+	ZFS_IOC_POOL_SCAN,			/* 0x07 */
+	ZFS_IOC_POOL_FREEZE,			/* 0x08 */
+	ZFS_IOC_POOL_UPGRADE,			/* 0x09 */
+	ZFS_IOC_POOL_GET_HISTORY,		/* 0x0a */
+	ZFS_IOC_VDEV_ADD,			/* 0x0b */
+	ZFS_IOC_VDEV_REMOVE,			/* 0x0c */
+	ZFS_IOC_VDEV_SET_STATE,			/* 0x0d */
+	ZFS_IOC_VDEV_ATTACH,			/* 0x0e */
+	ZFS_IOC_VDEV_DETACH,			/* 0x0f */
+	ZFS_IOC_VDEV_SETPATH,			/* 0x10 */
+	ZFS_IOC_VDEV_SETFRU,			/* 0x11 */
+	ZFS_IOC_OBJSET_STATS,			/* 0x12 */
+	ZFS_IOC_OBJSET_ZPLPROPS,		/* 0x13 */
+	ZFS_IOC_DATASET_LIST_NEXT,		/* 0x14 */
+	ZFS_IOC_SNAPSHOT_LIST_NEXT,		/* 0x15 */
+	ZFS_IOC_SET_PROP,			/* 0x16 */
+	ZFS_IOC_CREATE,				/* 0x17 */
+	ZFS_IOC_DESTROY,			/* 0x18 */
+	ZFS_IOC_ROLLBACK,			/* 0x19 */
+	ZFS_IOC_RENAME,				/* 0x1a */
+	ZFS_IOC_RECV,				/* 0x1b */
+	ZFS_IOC_SEND,				/* 0x1c */
+	ZFS_IOC_INJECT_FAULT,			/* 0x1d */
+	ZFS_IOC_CLEAR_FAULT,			/* 0x1e */
+	ZFS_IOC_INJECT_LIST_NEXT,		/* 0x1f */
+	ZFS_IOC_ERROR_LOG,			/* 0x20 */
+	ZFS_IOC_CLEAR,				/* 0x21 */
+	ZFS_IOC_PROMOTE,			/* 0x22 */
+	/* start of mismatch */
+	ZFS_IOC_LEGACY_SNAPSHOT,		/* 0x23 */
+	ZFS_IOC_LEGACY_DSOBJ_TO_DSNAME,		/* 0x24 */
+	ZFS_IOC_LEGACY_OBJ_TO_PATH,		/* 0x25 */
+	ZFS_IOC_LEGACY_POOL_SET_PROPS,		/* 0x26 */
+	ZFS_IOC_LEGACY_POOL_GET_PROPS,		/* 0x27 */
+	ZFS_IOC_LEGACY_SET_FSACL,		/* 0x28 */
+	ZFS_IOC_LEGACY_GET_FSACL,		/* 0x29 */
+	ZFS_IOC_LEGACY_SHARE,			/* 0x2a */
+	ZFS_IOC_LEGACY_INHERIT_PROP,		/* 0x2b */
+	ZFS_IOC_LEGACY_SMB_ACL,			/* 0x2c */
+	ZFS_IOC_LEGACY_USERSPACE_ONE,		/* 0x2d */
+	ZFS_IOC_LEGACY_USERSPACE_MANY,		/* 0x2e */
+	ZFS_IOC_LEGACY_USERSPACE_UPGRADE,	/* 0x2f */
+	ZFS_IOC_LEGACY_HOLD,			/* 0x30 */
+	ZFS_IOC_LEGACY_RELEASE,			/* 0x31 */
+	ZFS_IOC_LEGACY_GET_HOLDS,		/* 0x32 */
+	ZFS_IOC_LEGACY_OBJSET_RECVD_PROPS,	/* 0x33 */
+	ZFS_IOC_LEGACY_VDEV_SPLIT,		/* 0x34 */
+	ZFS_IOC_LEGACY_NEXT_OBJ,		/* 0x35 */
+	ZFS_IOC_LEGACY_DIFF,			/* 0x36 */
+	ZFS_IOC_LEGACY_TMP_SNAPSHOT,		/* 0x37 */
+	ZFS_IOC_LEGACY_OBJ_TO_STATS,		/* 0x38 */
+	ZFS_IOC_LEGACY_SPACE_WRITTEN,		/* 0x39 */
+	ZFS_IOC_LEGACY_SPACE_SNAPS,		/* 0x3a */
+	ZFS_IOC_LEGACY_DESTROY_SNAPS,		/* 0x3b */
+	ZFS_IOC_LEGACY_POOL_REGUID,		/* 0x3c */
+	ZFS_IOC_LEGACY_POOL_REOPEN,		/* 0x3d */
+	ZFS_IOC_LEGACY_SEND_PROGRESS,		/* 0x3e */
+	ZFS_IOC_LEGACY_LOG_HISTORY,		/* 0x3f */
+	ZFS_IOC_LEGACY_SEND_NEW,		/* 0x40 */
+	ZFS_IOC_LEGACY_SEND_SPACE,		/* 0x41 */
+	ZFS_IOC_LEGACY_CLONE,			/* 0x42 */
+	ZFS_IOC_LEGACY_BOOKMARK,		/* 0x43 */
+	ZFS_IOC_LEGACY_GET_BOOKMARKS,		/* 0x44 */
+	ZFS_IOC_LEGACY_DESTROY_BOOKMARKS,	/* 0x45 */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_RECV_NEW */
+	ZFS_IOC_LEGACY_POOL_SYNC,		/* 0x47 */
+	ZFS_IOC_LEGACY_CHANNEL_PROGRAM,		/* 0x48 */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_LOAD_KEY */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_UNLOAD_KEY */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_CHANGE_KEY */
+	ZFS_IOC_LEGACY_REMAP,			/* 0x4c */
+	ZFS_IOC_LEGACY_POOL_CHECKPOINT,		/* 0x4d */
+	ZFS_IOC_LEGACY_POOL_DISCARD_CHECKPOINT,	/* 0x4e */
+	ZFS_IOC_LEGACY_POOL_INITIALIZE,		/* 0x4f  */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_POOL_TRIM */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_REDACT */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_GET_BOOKMARK_PROPS */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_WAIT */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_WAIT_FS */
+};
+
+unsigned static long zfs_ioctl_ozfs_to_legacy_platform_[] = {
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_EVENTS_NEXT */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_EVENTS_CLEAR */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_EVENTS_SEEK */
+	ZFS_IOC_LEGACY_NEXTBOOT,
+	ZFS_IOC_LEGACY_JAIL,
+	ZFS_IOC_LEGACY_UNJAIL,
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_SET_BOOTENV */
+	ZFS_IOC_LEGACY_NONE, /* ZFS_IOC_GET_BOOTENV */
+};
+
+int
+zfs_ioctl_legacy_to_ozfs(int request)
+{
+	if (request >= sizeof (zfs_ioctl_legacy_to_ozfs_)/sizeof (long))
+		return (-1);
+	return (zfs_ioctl_legacy_to_ozfs_[request]);
+}
+
+int
+zfs_ioctl_ozfs_to_legacy(int request)
+{
+	if (request > ZFS_IOC_LAST)
+		return (-1);
+
+	if (request > ZFS_IOC_PLATFORM)
+		return (zfs_ioctl_ozfs_to_legacy_platform_[request]);
+	if (request >= sizeof (zfs_ioctl_ozfs_to_legacy_common_)/sizeof (long))
+		return (-1);
+	return (zfs_ioctl_ozfs_to_legacy_common_[request]);
+}
+
+void
+zfs_cmd_legacy_to_ozfs(zfs_cmd_legacy_t *src, zfs_cmd_t *dst)
+{
+	memcpy(dst, src, offsetof(zfs_cmd_t, zc_objset_stats));
+	*&dst->zc_objset_stats = *&src->zc_objset_stats;
+	memcpy(&dst->zc_begin_record, &src->zc_begin_record,
+	    offsetof(zfs_cmd_t, zc_sendobj) -
+	    offsetof(zfs_cmd_t, zc_begin_record));
+	memcpy(&dst->zc_sendobj, &src->zc_sendobj,
+	    sizeof (zfs_cmd_t) - 8 - offsetof(zfs_cmd_t, zc_sendobj));
+	dst->zc_zoneid = src->zc_jailid;
+}
+
+void
+zfs_cmd_ozfs_to_legacy(zfs_cmd_t *src, zfs_cmd_legacy_t *dst)
+{
+	memcpy(dst, src, offsetof(zfs_cmd_t, zc_objset_stats));
+	*&dst->zc_objset_stats = *&src->zc_objset_stats;
+	*&dst->zc_begin_record.drr_u.drr_begin = *&src->zc_begin_record;
+	dst->zc_begin_record.drr_payloadlen = 0;
+	dst->zc_begin_record.drr_type = 0;
+
+	memcpy(&dst->zc_inject_record, &src->zc_inject_record,
+	    offsetof(zfs_cmd_t, zc_sendobj) -
+	    offsetof(zfs_cmd_t, zc_inject_record));
+	dst->zc_resumable = B_FALSE;
+	memcpy(&dst->zc_sendobj, &src->zc_sendobj,
+	    sizeof (zfs_cmd_t) - 8 - offsetof(zfs_cmd_t, zc_sendobj));
+	dst->zc_jailid = src->zc_zoneid;
+}