diff --git a/README.md b/README.md
index af244c1fff..a90736bb56 100644
--- a/README.md
+++ b/README.md
@@ -32,4 +32,4 @@ For more details see the NOTICE, LICENSE and COPYRIGHT files; `UCRL-CODE-235197`
 
 # Supported Kernels
   * The `META` file contains the officially recognized supported Linux kernel versions.
-  * Supported FreeBSD versions are any supported branches and releases starting from 12.4-RELEASE.
+  * Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.
diff --git a/include/os/freebsd/spl/sys/ccompat.h b/include/os/freebsd/spl/sys/ccompat.h
index e34bab7e89..48749fb8ee 100644
--- a/include/os/freebsd/spl/sys/ccompat.h
+++ b/include/os/freebsd/spl/sys/ccompat.h
@@ -28,48 +28,6 @@
 #ifndef	_SYS_CCOMPAT_H
 #define	_SYS_CCOMPAT_H
 
-#if  __FreeBSD_version < 1300051
-#define	vm_page_valid(m) (m)->valid = VM_PAGE_BITS_ALL
-#define	vm_page_do_sunbusy(m)
-#define	vm_page_none_valid(m) ((m)->valid == 0)
-#else
-#define	vm_page_do_sunbusy(m) vm_page_sunbusy(m)
-#endif
-
-#if  __FreeBSD_version < 1300074
-#define	VOP_UNLOCK1(x)	VOP_UNLOCK(x, 0)
-#else
-#define	VOP_UNLOCK1(x)	VOP_UNLOCK(x)
-#endif
-
-#if  __FreeBSD_version < 1300064
-#define	VN_IS_DOOMED(vp)	((vp)->v_iflag & VI_DOOMED)
-#endif
-
-#if  __FreeBSD_version < 1300068
-#define	VFS_VOP_VECTOR_REGISTER(x)
-#endif
-
-#if  __FreeBSD_version >= 1300076
-#define	getnewvnode_reserve_()	getnewvnode_reserve()
-#else
-#define	getnewvnode_reserve_()	getnewvnode_reserve(1)
-#endif
-
-#if  __FreeBSD_version < 1300102
-#define	ASSERT_VOP_IN_SEQC(zp)
-#define	MNTK_FPLOOKUP 0
-#define	vn_seqc_write_begin(vp)
-#define	vn_seqc_write_end(vp)
-
-#ifndef VFS_SMR_DECLARE
-#define	VFS_SMR_DECLARE
-#endif
-#ifndef VFS_SMR_ZONE_SET
-#define	VFS_SMR_ZONE_SET(zone)
-#endif
-#endif
-
 struct hlist_node {
 	struct hlist_node *next, **pprev;
 };
diff --git a/include/os/freebsd/spl/sys/policy.h b/include/os/freebsd/spl/sys/policy.h
index 909ae3886e..32c10bdca9 100644
--- a/include/os/freebsd/spl/sys/policy.h
+++ b/include/os/freebsd/spl/sys/policy.h
@@ -70,10 +70,4 @@ int	secpolicy_xvattr(vnode_t *vp, xvattr_t *xvap, uid_t owner, cred_t *cr,
 	    vtype_t vtype);
 int	secpolicy_smb(cred_t *cr);
 
-
-#if __FreeBSD_version >= 1300005
-#define	spl_priv_check_cred(a, b) priv_check_cred((a), (b))
-#else
-#define	spl_priv_check_cred(a, b) priv_check_cred((a), (b), 0)
-#endif
 #endif	/* _OPENSOLARIS_SYS_POLICY_H_ */
diff --git a/include/os/freebsd/spl/sys/proc.h b/include/os/freebsd/spl/sys/proc.h
index 8583df509b..96ba10e567 100644
--- a/include/os/freebsd/spl/sys/proc.h
+++ b/include/os/freebsd/spl/sys/proc.h
@@ -88,9 +88,6 @@ do_thread_create(caddr_t stk, size_t stksize, void (*proc)(void *), void *arg,
 		thread_lock(td);
 		sched_prio(td, pri);
 		sched_add(td, SRQ_BORING);
-#if __FreeBSD_version < 1300068
-		thread_unlock(td);
-#endif
 	}
 	return (td);
 }
diff --git a/include/os/freebsd/spl/sys/random.h b/include/os/freebsd/spl/sys/random.h
index 7583166e72..146fa9e5d1 100644
--- a/include/os/freebsd/spl/sys/random.h
+++ b/include/os/freebsd/spl/sys/random.h
@@ -30,9 +30,7 @@
 #define	_OPENSOLARIS_SYS_RANDOM_H_
 
 #include_next <sys/random.h>
-#if  __FreeBSD_version >= 1300108
 #include <sys/prng.h>
-#endif
 
 static inline int
 random_get_bytes(uint8_t *p, size_t s)
@@ -51,7 +49,7 @@ random_get_pseudo_bytes(uint8_t *p, size_t s)
 static inline uint32_t
 random_in_range(uint32_t range)
 {
-#if defined(_KERNEL) && __FreeBSD_version >= 1300108
+#if defined(_KERNEL)
 	return (prng32_bounded(range));
 #else
 	uint32_t r;
diff --git a/include/os/freebsd/spl/sys/vm.h b/include/os/freebsd/spl/sys/vm.h
index 7b3830be8a..07ee6bc191 100644
--- a/include/os/freebsd/spl/sys/vm.h
+++ b/include/os/freebsd/spl/sys/vm.h
@@ -41,22 +41,6 @@ void	zfs_vmobject_assert_wlocked(vm_object_t object);
 void	zfs_vmobject_wlock(vm_object_t object);
 void	zfs_vmobject_wunlock(vm_object_t object);
 
-#if __FreeBSD_version >= 1300081
-#define	zfs_vmobject_assert_wlocked_12(x)
-#define	zfs_vmobject_wlock_12(x)
-#define	zfs_vmobject_wunlock_12(x)
-#else
-#define	zfs_vmobject_assert_wlocked_12(x)		\
-	zfs_vmobject_assert_wlocked((x))
-#define	zfs_vmobject_wlock_12(x)				\
-	zfs_vmobject_wlock(x)
-#define	zfs_vmobject_wunlock_12(x)				\
-	zfs_vmobject_wunlock(x)
-#define	vm_page_grab_unlocked(obj, idx, flags)	\
-	vm_page_grab((obj), (idx), (flags))
-#define	vm_page_grab_valid_unlocked(m, obj, idx, flags)	\
-	vm_page_grab_valid((m), (obj), (idx), (flags))
-#endif
 static inline caddr_t
 zfs_map_page(vm_page_t pp, struct sf_buf **sfp)
 {
diff --git a/include/os/freebsd/spl/sys/vnode.h b/include/os/freebsd/spl/sys/vnode.h
index 75c32f221f..76ea3eff37 100644
--- a/include/os/freebsd/spl/sys/vnode.h
+++ b/include/os/freebsd/spl/sys/vnode.h
@@ -95,17 +95,13 @@ vn_is_readonly(vnode_t *vp)
 static __inline void
 vn_flush_cached_data(vnode_t *vp, boolean_t sync)
 {
-#if __FreeBSD_version > 1300054
 	if (vm_object_mightbedirty(vp->v_object)) {
-#else
-	if (vp->v_object->flags & OBJ_MIGHTBEDIRTY) {
-#endif
 		int flags = sync ? OBJPC_SYNC : 0;
 		vn_lock(vp, LK_SHARED | LK_RETRY);
 		zfs_vmobject_wlock(vp->v_object);
 		vm_object_page_clean(vp->v_object, 0, 0, flags);
 		zfs_vmobject_wunlock(vp->v_object);
-		VOP_UNLOCK1(vp);
+		VOP_UNLOCK(vp);
 	}
 }
 #endif
diff --git a/include/os/freebsd/zfs/sys/zfs_vfsops_os.h b/include/os/freebsd/zfs/sys/zfs_vfsops_os.h
index 7f0f24325d..3e54f3e846 100644
--- a/include/os/freebsd/zfs/sys/zfs_vfsops_os.h
+++ b/include/os/freebsd/zfs/sys/zfs_vfsops_os.h
@@ -27,40 +27,21 @@
 #ifndef	_SYS_FS_ZFS_VFSOPS_H
 #define	_SYS_FS_ZFS_VFSOPS_H
 
-#if __FreeBSD_version >= 1300125
-#define	TEARDOWN_RMS
-#endif
-
-#if __FreeBSD_version >= 1300109
-#define	TEARDOWN_INACTIVE_RMS
-#endif
-
 #include <sys/dataset_kstats.h>
 #include <sys/list.h>
 #include <sys/vfs.h>
 #include <sys/zil.h>
 #include <sys/sa.h>
 #include <sys/rrwlock.h>
-#ifdef TEARDOWN_INACTIVE_RMS
 #include <sys/rmlock.h>
-#endif
 #include <sys/zfs_ioctl.h>
 
 #ifdef	__cplusplus
 extern "C" {
 #endif
 
-#ifdef TEARDOWN_RMS
 typedef struct rmslock zfs_teardown_lock_t;
-#else
-#define	zfs_teardown_lock_t		rrmlock_t
-#endif
-
-#ifdef TEARDOWN_INACTIVE_RMS
 typedef struct rmslock zfs_teardown_inactive_lock_t;
-#else
-#define	zfs_teardown_inactive_lock_t krwlock_t
-#endif
 
 typedef struct zfsvfs zfsvfs_t;
 struct znode;
@@ -120,7 +101,6 @@ struct zfsvfs {
 	struct task	z_unlinked_drain_task;
 };
 
-#ifdef TEARDOWN_RMS
 #define	ZFS_TEARDOWN_INIT(zfsvfs)		\
 	rms_init(&(zfsvfs)->z_teardown_lock, "zfs teardown")
 
@@ -150,39 +130,7 @@ struct zfsvfs {
 
 #define	ZFS_TEARDOWN_HELD(zfsvfs)		\
 	rms_owned_any(&(zfsvfs)->z_teardown_lock)
-#else
-#define	ZFS_TEARDOWN_INIT(zfsvfs)		\
-	rrm_init(&(zfsvfs)->z_teardown_lock, B_FALSE)
 
-#define	ZFS_TEARDOWN_DESTROY(zfsvfs)		\
-	rrm_destroy(&(zfsvfs)->z_teardown_lock)
-
-#define	ZFS_TEARDOWN_ENTER_READ(zfsvfs, tag)	\
-	rrm_enter_read(&(zfsvfs)->z_teardown_lock, tag);
-
-#define	ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag)	\
-	rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
-
-#define	ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, tag)	\
-	rrm_enter(&(zfsvfs)->z_teardown_lock, RW_WRITER, tag)
-
-#define	ZFS_TEARDOWN_EXIT_WRITE(zfsvfs)		\
-	rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
-
-#define	ZFS_TEARDOWN_EXIT(zfsvfs, tag)		\
-	rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
-
-#define	ZFS_TEARDOWN_READ_HELD(zfsvfs)		\
-	RRM_READ_HELD(&(zfsvfs)->z_teardown_lock)
-
-#define	ZFS_TEARDOWN_WRITE_HELD(zfsvfs)		\
-	RRM_WRITE_HELD(&(zfsvfs)->z_teardown_lock)
-
-#define	ZFS_TEARDOWN_HELD(zfsvfs)		\
-	RRM_LOCK_HELD(&(zfsvfs)->z_teardown_lock)
-#endif
-
-#ifdef TEARDOWN_INACTIVE_RMS
 #define	ZFS_TEARDOWN_INACTIVE_INIT(zfsvfs)		\
 	rms_init(&(zfsvfs)->z_teardown_inactive_lock, "zfs teardown inactive")
 
@@ -206,31 +154,6 @@ struct zfsvfs {
 
 #define	ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs)	\
 	rms_wowned(&(zfsvfs)->z_teardown_inactive_lock)
-#else
-#define	ZFS_TEARDOWN_INACTIVE_INIT(zfsvfs)		\
-	rw_init(&(zfsvfs)->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL)
-
-#define	ZFS_TEARDOWN_INACTIVE_DESTROY(zfsvfs)		\
-	rw_destroy(&(zfsvfs)->z_teardown_inactive_lock)
-
-#define	ZFS_TEARDOWN_INACTIVE_TRY_ENTER_READ(zfsvfs)	\
-	rw_tryenter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
-
-#define	ZFS_TEARDOWN_INACTIVE_ENTER_READ(zfsvfs)	\
-	rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
-
-#define	ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs)		\
-	rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
-
-#define	ZFS_TEARDOWN_INACTIVE_ENTER_WRITE(zfsvfs)	\
-	rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_WRITER)
-
-#define	ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs)	\
-	rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
-
-#define	ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs)	\
-	RW_WRITE_HELD(&(zfsvfs)->z_teardown_inactive_lock)
-#endif
 
 #define	ZSB_XATTR	0x0001		/* Enable user xattrs */
 /*
diff --git a/module/os/freebsd/spl/spl_kmem.c b/module/os/freebsd/spl/spl_kmem.c
index 95af6200cd..ceaa2b40be 100644
--- a/module/os/freebsd/spl/spl_kmem.c
+++ b/module/os/freebsd/spl/spl_kmem.c
@@ -240,22 +240,14 @@ void
 kmem_cache_reap_soon(kmem_cache_t *cache)
 {
 #ifndef KMEM_DEBUG
-#if __FreeBSD_version >= 1300043
 	uma_zone_reclaim(cache->kc_zone, UMA_RECLAIM_DRAIN);
-#else
-	zone_drain(cache->kc_zone);
-#endif
 #endif
 }
 
 void
 kmem_reap(void)
 {
-#if __FreeBSD_version >= 1300043
 	uma_reclaim(UMA_RECLAIM_TRIM);
-#else
-	uma_reclaim();
-#endif
 }
 #else
 void
diff --git a/module/os/freebsd/spl/spl_policy.c b/module/os/freebsd/spl/spl_policy.c
index f2dd7c8e7f..42a693b073 100644
--- a/module/os/freebsd/spl/spl_policy.c
+++ b/module/os/freebsd/spl/spl_policy.c
@@ -41,42 +41,42 @@ int
 secpolicy_nfs(cred_t *cr)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_NFS_DAEMON));
+	return (priv_check_cred(cr, PRIV_NFS_DAEMON));
 }
 
 int
 secpolicy_zfs(cred_t *cr)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT));
+	return (priv_check_cred(cr, PRIV_VFS_MOUNT));
 }
 
 int
 secpolicy_zfs_proc(cred_t *cr, proc_t *proc)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT));
+	return (priv_check_cred(cr, PRIV_VFS_MOUNT));
 }
 
 int
 secpolicy_sys_config(cred_t *cr, int checkonly __unused)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_ZFS_POOL_CONFIG));
+	return (priv_check_cred(cr, PRIV_ZFS_POOL_CONFIG));
 }
 
 int
 secpolicy_zinject(cred_t *cr)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_ZFS_INJECT));
+	return (priv_check_cred(cr, PRIV_ZFS_INJECT));
 }
 
 int
 secpolicy_fs_unmount(cred_t *cr, struct mount *vfsp __unused)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_VFS_UNMOUNT));
+	return (priv_check_cred(cr, PRIV_VFS_UNMOUNT));
 }
 
 int
@@ -104,7 +104,7 @@ secpolicy_basic_link(vnode_t *vp, cred_t *cr)
 		return (0);
 	if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
 		return (0);
-	return (spl_priv_check_cred(cr, PRIV_VFS_LINK));
+	return (priv_check_cred(cr, PRIV_VFS_LINK));
 }
 
 int
@@ -120,7 +120,7 @@ secpolicy_vnode_remove(vnode_t *vp, cred_t *cr)
 
 	if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
 		return (0);
-	return (spl_priv_check_cred(cr, PRIV_VFS_ADMIN));
+	return (priv_check_cred(cr, PRIV_VFS_ADMIN));
 }
 
 int
@@ -130,18 +130,18 @@ secpolicy_vnode_access(cred_t *cr, vnode_t *vp, uid_t owner, accmode_t accmode)
 	if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
 		return (0);
 
-	if ((accmode & VREAD) && spl_priv_check_cred(cr, PRIV_VFS_READ) != 0)
+	if ((accmode & VREAD) && priv_check_cred(cr, PRIV_VFS_READ) != 0)
 		return (EACCES);
 	if ((accmode & VWRITE) &&
-	    spl_priv_check_cred(cr, PRIV_VFS_WRITE) != 0) {
+	    priv_check_cred(cr, PRIV_VFS_WRITE) != 0) {
 		return (EACCES);
 	}
 	if (accmode & VEXEC) {
 		if (vp->v_type == VDIR) {
-			if (spl_priv_check_cred(cr, PRIV_VFS_LOOKUP) != 0)
+			if (priv_check_cred(cr, PRIV_VFS_LOOKUP) != 0)
 				return (EACCES);
 		} else {
-			if (spl_priv_check_cred(cr, PRIV_VFS_EXEC) != 0)
+			if (priv_check_cred(cr, PRIV_VFS_EXEC) != 0)
 				return (EACCES);
 		}
 	}
@@ -198,7 +198,7 @@ secpolicy_vnode_any_access(cred_t *cr, vnode_t *vp, uid_t owner)
 				continue;
 			break;
 		}
-		if (spl_priv_check_cred(cr, priv) == 0)
+		if (priv_check_cred(cr, priv) == 0)
 			return (0);
 	}
 	return (EPERM);
@@ -212,7 +212,7 @@ secpolicy_vnode_setdac(vnode_t *vp, cred_t *cr, uid_t owner)
 		return (0);
 	if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
 		return (0);
-	return (spl_priv_check_cred(cr, PRIV_VFS_ADMIN));
+	return (priv_check_cred(cr, PRIV_VFS_ADMIN));
 }
 
 int
@@ -262,7 +262,7 @@ secpolicy_vnode_setattr(cred_t *cr, vnode_t *vp, struct vattr *vap,
 		    ((mask & AT_GID) && vap->va_gid != ovap->va_gid &&
 		    !groupmember(vap->va_gid, cr))) {
 			if (secpolicy_fs_owner(vp->v_mount, cr) != 0) {
-				error = spl_priv_check_cred(cr, PRIV_VFS_CHOWN);
+				error = priv_check_cred(cr, PRIV_VFS_CHOWN);
 				if (error)
 					return (error);
 			}
@@ -306,7 +306,7 @@ secpolicy_vnode_setids_setgids(vnode_t *vp, cred_t *cr, gid_t gid)
 		return (0);
 	if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
 		return (0);
-	return (spl_priv_check_cred(cr, PRIV_VFS_SETGID));
+	return (priv_check_cred(cr, PRIV_VFS_SETGID));
 }
 
 int
@@ -316,7 +316,7 @@ secpolicy_vnode_setid_retain(znode_t *zp, cred_t *cr,
 
 	if (secpolicy_fs_owner(ZTOV(zp)->v_mount, cr) == 0)
 		return (0);
-	return (spl_priv_check_cred(cr, PRIV_VFS_RETAINSUGID));
+	return (priv_check_cred(cr, PRIV_VFS_RETAINSUGID));
 }
 
 void
@@ -327,7 +327,7 @@ secpolicy_setid_clear(struct vattr *vap, vnode_t *vp, cred_t *cr)
 		return;
 
 	if ((vap->va_mode & (S_ISUID | S_ISGID)) != 0) {
-		if (spl_priv_check_cred(cr, PRIV_VFS_RETAINSUGID)) {
+		if (priv_check_cred(cr, PRIV_VFS_RETAINSUGID)) {
 			vap->va_mask |= AT_MODE;
 			vap->va_mode &= ~(S_ISUID|S_ISGID);
 		}
@@ -349,7 +349,7 @@ secpolicy_setid_setsticky_clear(vnode_t *vp, struct vattr *vap,
 	 * is not a member of. Both of these are allowed in jail(8).
 	 */
 	if (vp->v_type != VDIR && (vap->va_mode & S_ISTXT)) {
-		if (spl_priv_check_cred(cr, PRIV_VFS_STICKYFILE))
+		if (priv_check_cred(cr, PRIV_VFS_STICKYFILE))
 			return (EFTYPE);
 	}
 	/*
@@ -365,7 +365,7 @@ secpolicy_setid_setsticky_clear(vnode_t *vp, struct vattr *vap,
 	 * Deny setting setuid if we are not the file owner.
 	 */
 	if ((vap->va_mode & S_ISUID) && ovap->va_uid != cr->cr_uid) {
-		error = spl_priv_check_cred(cr, PRIV_VFS_ADMIN);
+		error = priv_check_cred(cr, PRIV_VFS_ADMIN);
 		if (error)
 			return (error);
 	}
@@ -376,7 +376,7 @@ int
 secpolicy_fs_mount(cred_t *cr, vnode_t *mvp, struct mount *vfsp)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT));
+	return (priv_check_cred(cr, PRIV_VFS_MOUNT));
 }
 
 int
@@ -389,7 +389,7 @@ secpolicy_vnode_owner(vnode_t *vp, cred_t *cr, uid_t owner)
 		return (0);
 
 	/* XXX: vfs_suser()? */
-	return (spl_priv_check_cred(cr, PRIV_VFS_MOUNT_OWNER));
+	return (priv_check_cred(cr, PRIV_VFS_MOUNT_OWNER));
 }
 
 int
@@ -398,14 +398,14 @@ secpolicy_vnode_chown(vnode_t *vp, cred_t *cr, uid_t owner)
 
 	if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
 		return (0);
-	return (spl_priv_check_cred(cr, PRIV_VFS_CHOWN));
+	return (priv_check_cred(cr, PRIV_VFS_CHOWN));
 }
 
 void
 secpolicy_fs_mount_clearopts(cred_t *cr, struct mount *vfsp)
 {
 
-	if (spl_priv_check_cred(cr, PRIV_VFS_MOUNT_NONUSER) != 0) {
+	if (priv_check_cred(cr, PRIV_VFS_MOUNT_NONUSER) != 0) {
 		MNT_ILOCK(vfsp);
 		vfsp->vfs_flag |= VFS_NOSETUID | MNT_USER;
 		vfs_clearmntopt(vfsp, MNTOPT_SETUID);
@@ -424,12 +424,12 @@ secpolicy_xvattr(vnode_t *vp, xvattr_t *xvap, uid_t owner, cred_t *cr,
 
 	if (secpolicy_fs_owner(vp->v_mount, cr) == 0)
 		return (0);
-	return (spl_priv_check_cred(cr, PRIV_VFS_SYSFLAGS));
+	return (priv_check_cred(cr, PRIV_VFS_SYSFLAGS));
 }
 
 int
 secpolicy_smb(cred_t *cr)
 {
 
-	return (spl_priv_check_cred(cr, PRIV_NETSMB));
+	return (priv_check_cred(cr, PRIV_NETSMB));
 }
diff --git a/module/os/freebsd/spl/spl_taskq.c b/module/os/freebsd/spl/spl_taskq.c
index 67c0a4c941..e4b75f91b8 100644
--- a/module/os/freebsd/spl/spl_taskq.c
+++ b/module/os/freebsd/spl/spl_taskq.c
@@ -42,11 +42,6 @@
 
 #include <vm/uma.h>
 
-#if __FreeBSD_version < 1201522
-#define	taskqueue_start_threads_in_proc(tqp, count, pri, proc, name, ...) \
-    taskqueue_start_threads(tqp, count, pri, name, __VA_ARGS__)
-#endif
-
 static uint_t taskq_tsd;
 static uma_zone_t taskq_zone;
 
diff --git a/module/os/freebsd/spl/spl_vfs.c b/module/os/freebsd/spl/spl_vfs.c
index 724709ddee..6af3da138f 100644
--- a/module/os/freebsd/spl/spl_vfs.c
+++ b/module/os/freebsd/spl/spl_vfs.c
@@ -158,7 +158,7 @@ mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype, char *fspath,
 		return (error);
 	}
 	vn_seqc_write_begin(vp);
-	VOP_UNLOCK1(vp);
+	VOP_UNLOCK(vp);
 
 	/*
 	 * Allocate and initialize the filesystem.
@@ -249,10 +249,8 @@ mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype, char *fspath,
 	if (VFS_ROOT(mp, LK_EXCLUSIVE, &mvp))
 		panic("mount: lost mount");
 	vn_seqc_write_end(vp);
-	VOP_UNLOCK1(vp);
-#if __FreeBSD_version >= 1300048
+	VOP_UNLOCK(vp);
 	vfs_op_exit(mp);
-#endif
 	vfs_unbusy(mp);
 	*vpp = mvp;
 	return (0);
@@ -272,12 +270,8 @@ void
 vn_rele_async(vnode_t *vp, taskq_t *taskq)
 {
 	VERIFY3U(vp->v_usecount, >, 0);
-	if (refcount_release_if_not_last(&vp->v_usecount)) {
-#if __FreeBSD_version < 1300045
-		vdrop(vp);
-#endif
+	if (refcount_release_if_not_last(&vp->v_usecount))
 		return;
-	}
 	VERIFY3U(taskq_dispatch((taskq_t *)taskq,
 	    (task_func_t *)vrele, vp, TQ_SLEEP), !=, 0);
 }
diff --git a/module/os/freebsd/spl/spl_zone.c b/module/os/freebsd/spl/spl_zone.c
index 7f2b5c712c..e3896517bd 100644
--- a/module/os/freebsd/spl/spl_zone.c
+++ b/module/os/freebsd/spl/spl_zone.c
@@ -63,7 +63,7 @@ zone_dataset_attach(struct ucred *cred, const char *dataset, int jailid)
 	struct prison *pr;
 	int dofree, error;
 
-	if ((error = spl_priv_check_cred(cred, PRIV_ZFS_JAIL)) != 0)
+	if ((error = priv_check_cred(cred, PRIV_ZFS_JAIL)) != 0)
 		return (error);
 
 	/* Allocate memory before we grab prison's mutex. */
@@ -116,7 +116,7 @@ zone_dataset_detach(struct ucred *cred, const char *dataset, int jailid)
 	struct prison *pr;
 	int error;
 
-	if ((error = spl_priv_check_cred(cred, PRIV_ZFS_JAIL)) != 0)
+	if ((error = priv_check_cred(cred, PRIV_ZFS_JAIL)) != 0)
 		return (error);
 
 	sx_slock(&allprison_lock);
diff --git a/module/os/freebsd/zfs/crypto_os.c b/module/os/freebsd/zfs/crypto_os.c
index ed8d240761..4d8493743e 100644
--- a/module/os/freebsd/zfs/crypto_os.c
+++ b/module/os/freebsd/zfs/crypto_os.c
@@ -197,13 +197,6 @@ zfs_crypto_dispatch(freebsd_crypt_session_t *session, struct cryptop *crp)
 		crp->crp_etype = 0;
 		crp->crp_flags &= ~CRYPTO_F_DONE;
 		session->fs_done = false;
-#if __FreeBSD_version < 1300087
-		/*
-		 * Session ID changed, so we should record that,
-		 * and try again
-		 */
-		session->fs_sid = crp->crp_session;
-#endif
 	}
 	return (error);
 }
@@ -250,7 +243,6 @@ freebsd_crypt_uio_debug_log(boolean_t encrypt,
  * happen every time the key changes (including when
  * it's first loaded).
  */
-#if __FreeBSD_version >= 1300087
 int
 freebsd_crypt_newsession(freebsd_crypt_session_t *sessp,
     const struct zio_crypt_info *c_info, crypto_key_t *key)
@@ -389,244 +381,3 @@ out:
 	}
 	return (error);
 }
-
-#else
-int
-freebsd_crypt_newsession(freebsd_crypt_session_t *sessp,
-    const struct zio_crypt_info *c_info, crypto_key_t *key)
-{
-	struct cryptoini cria = {0}, crie = {0}, *crip;
-	struct enc_xform *xform;
-	struct auth_hash *xauth;
-	int error = 0;
-	crypto_session_t sid;
-
-#ifdef FCRYPTO_DEBUG
-	printf("%s(%p, { %s, %d, %d, %s }, { %p, %u })\n",
-	    __FUNCTION__, sessp,
-	    c_info->ci_algname, c_info->ci_crypt_type,
-	    (unsigned int)c_info->ci_keylen, c_info->ci_name,
-	    key->ck_data, (unsigned int)key->ck_length);
-	printf("\tkey = { ");
-	for (int i = 0; i < key->ck_length / 8; i++) {
-		uint8_t *b = (uint8_t *)key->ck_data;
-		printf("%02x ", b[i]);
-	}
-	printf("}\n");
-#endif
-	switch (c_info->ci_crypt_type) {
-	case ZC_TYPE_GCM:
-		xform = &enc_xform_aes_nist_gcm;
-		switch (key->ck_length/8) {
-		case AES_128_GMAC_KEY_LEN:
-			xauth = &auth_hash_nist_gmac_aes_128;
-			break;
-		case AES_192_GMAC_KEY_LEN:
-			xauth = &auth_hash_nist_gmac_aes_192;
-			break;
-		case AES_256_GMAC_KEY_LEN:
-			xauth = &auth_hash_nist_gmac_aes_256;
-			break;
-		default:
-			error = EINVAL;
-			goto bad;
-		}
-		break;
-	case ZC_TYPE_CCM:
-		xform = &enc_xform_ccm;
-		switch (key->ck_length/8) {
-		case AES_128_CBC_MAC_KEY_LEN:
-			xauth = &auth_hash_ccm_cbc_mac_128;
-			break;
-		case AES_192_CBC_MAC_KEY_LEN:
-			xauth = &auth_hash_ccm_cbc_mac_192;
-			break;
-		case AES_256_CBC_MAC_KEY_LEN:
-			xauth = &auth_hash_ccm_cbc_mac_256;
-			break;
-		default:
-			error = EINVAL;
-			goto bad;
-			break;
-		}
-		break;
-	default:
-		error = ENOTSUP;
-		goto bad;
-	}
-#ifdef FCRYPTO_DEBUG
-	printf("%s(%d): Using crypt %s (key length %u [%u bytes]), "
-	    "auth %s (key length %d)\n",
-	    __FUNCTION__, __LINE__,
-	    xform->name, (unsigned int)key->ck_length,
-	    (unsigned int)key->ck_length/8,
-	    xauth->name, xauth->keysize);
-#endif
-
-	crie.cri_alg = xform->type;
-	crie.cri_key = key->ck_data;
-	crie.cri_klen = key->ck_length;
-
-	cria.cri_alg = xauth->type;
-	cria.cri_key = key->ck_data;
-	cria.cri_klen = key->ck_length;
-
-	cria.cri_next = &crie;
-	crie.cri_next = NULL;
-	crip = &cria;
-	// Everything else is zero-initialised
-
-	error = crypto_newsession(&sid, crip,
-	    CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE);
-	if (error != 0) {
-		printf("%s(%d):  crypto_newsession failed with %d\n",
-		    __FUNCTION__, __LINE__, error);
-		goto bad;
-	}
-	sessp->fs_sid = sid;
-	mtx_init(&sessp->fs_lock, "FreeBSD Cryptographic Session Lock",
-	    NULL, MTX_DEF);
-	crypt_sessions++;
-bad:
-	return (error);
-}
-
-/*
- * The meat of encryption/decryption.
- * If sessp is NULL, then it will create a
- * temporary cryptographic session, and release
- * it when done.
- */
-int
-freebsd_crypt_uio(boolean_t encrypt,
-    freebsd_crypt_session_t *input_sessionp,
-    const struct zio_crypt_info *c_info,
-    zfs_uio_t *data_uio,
-    crypto_key_t *key,
-    uint8_t *ivbuf,
-    size_t datalen,
-    size_t auth_len)
-{
-	struct cryptop *crp;
-	struct cryptodesc *enc_desc, *auth_desc;
-	struct enc_xform *xform;
-	struct auth_hash *xauth;
-	freebsd_crypt_session_t *session = NULL;
-	int error;
-
-	freebsd_crypt_uio_debug_log(encrypt, input_sessionp, c_info, data_uio,
-	    key, ivbuf, datalen, auth_len);
-	switch (c_info->ci_crypt_type) {
-	case ZC_TYPE_GCM:
-		xform = &enc_xform_aes_nist_gcm;
-		switch (key->ck_length/8) {
-		case AES_128_GMAC_KEY_LEN:
-			xauth = &auth_hash_nist_gmac_aes_128;
-			break;
-		case AES_192_GMAC_KEY_LEN:
-			xauth = &auth_hash_nist_gmac_aes_192;
-			break;
-		case AES_256_GMAC_KEY_LEN:
-			xauth = &auth_hash_nist_gmac_aes_256;
-			break;
-		default:
-			error = EINVAL;
-			goto bad;
-		}
-		break;
-	case ZC_TYPE_CCM:
-		xform = &enc_xform_ccm;
-		switch (key->ck_length/8) {
-		case AES_128_CBC_MAC_KEY_LEN:
-			xauth = &auth_hash_ccm_cbc_mac_128;
-			break;
-		case AES_192_CBC_MAC_KEY_LEN:
-			xauth = &auth_hash_ccm_cbc_mac_192;
-			break;
-		case AES_256_CBC_MAC_KEY_LEN:
-			xauth = &auth_hash_ccm_cbc_mac_256;
-			break;
-		default:
-			error = EINVAL;
-			goto bad;
-			break;
-		}
-		break;
-	default:
-		error = ENOTSUP;
-		goto bad;
-	}
-
-#ifdef FCRYPTO_DEBUG
-	printf("%s(%d): Using crypt %s (key length %u [%u bytes]), "
-	    "auth %s (key length %d)\n",
-	    __FUNCTION__, __LINE__,
-	    xform->name, (unsigned int)key->ck_length,
-	    (unsigned int)key->ck_length/8,
-	    xauth->name, xauth->keysize);
-#endif
-
-	if (input_sessionp == NULL) {
-		session = kmem_zalloc(sizeof (*session), KM_SLEEP);
-		error = freebsd_crypt_newsession(session, c_info, key);
-		if (error)
-			goto out;
-	} else
-		session = input_sessionp;
-
-	crp = crypto_getreq(2);
-	if (crp == NULL) {
-		error = ENOMEM;
-		goto bad;
-	}
-
-	auth_desc = crp->crp_desc;
-	enc_desc = auth_desc->crd_next;
-
-	crp->crp_session = session->fs_sid;
-	crp->crp_ilen = auth_len + datalen;
-	crp->crp_buf = (void*)GET_UIO_STRUCT(data_uio);
-	crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIFSYNC;
-
-	auth_desc->crd_skip = 0;
-	auth_desc->crd_len = auth_len;
-	auth_desc->crd_inject = auth_len + datalen;
-	auth_desc->crd_alg = xauth->type;
-#ifdef FCRYPTO_DEBUG
-	printf("%s: auth: skip = %u, len = %u, inject = %u\n",
-	    __FUNCTION__, auth_desc->crd_skip, auth_desc->crd_len,
-	    auth_desc->crd_inject);
-#endif
-
-	enc_desc->crd_skip = auth_len;
-	enc_desc->crd_len = datalen;
-	enc_desc->crd_inject = auth_len;
-	enc_desc->crd_alg = xform->type;
-	enc_desc->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
-	memcpy(enc_desc->crd_iv, ivbuf, ZIO_DATA_IV_LEN);
-	enc_desc->crd_next = NULL;
-
-#ifdef FCRYPTO_DEBUG
-	printf("%s: enc: skip = %u, len = %u, inject = %u\n",
-	    __FUNCTION__, enc_desc->crd_skip, enc_desc->crd_len,
-	    enc_desc->crd_inject);
-#endif
-
-	if (encrypt)
-		enc_desc->crd_flags |= CRD_F_ENCRYPT;
-
-	error = zfs_crypto_dispatch(session, crp);
-	crypto_freereq(crp);
-out:
-	if (input_sessionp == NULL) {
-		freebsd_crypt_freesession(session);
-		kmem_free(session, sizeof (*session));
-	}
-bad:
-#ifdef FCRYPTO_DEBUG
-	if (error)
-		printf("%s: returning error %d\n", __FUNCTION__, error);
-#endif
-	return (error);
-}
-#endif
diff --git a/module/os/freebsd/zfs/dmu_os.c b/module/os/freebsd/zfs/dmu_os.c
index 48ea37cbad..0a0af102ea 100644
--- a/module/os/freebsd/zfs/dmu_os.c
+++ b/module/os/freebsd/zfs/dmu_os.c
@@ -60,20 +60,7 @@
 #define	IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
 #endif
 
-#if  __FreeBSD_version < 1300051
-#define	VM_ALLOC_BUSY_FLAGS VM_ALLOC_NOBUSY
-#else
 #define	VM_ALLOC_BUSY_FLAGS  VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY
-#endif
-
-
-#if __FreeBSD_version < 1300072
-#define	dmu_page_lock(m)	vm_page_lock(m)
-#define	dmu_page_unlock(m)	vm_page_unlock(m)
-#else
-#define	dmu_page_lock(m)
-#define	dmu_page_unlock(m)
-#endif
 
 int
 dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
@@ -167,7 +154,6 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
 #endif
 
 	vmobj = ma[0]->object;
-	zfs_vmobject_wlock_12(vmobj);
 
 	db = dbp[0];
 	for (i = 0; i < *rbehind; i++) {
@@ -177,7 +163,7 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
 			break;
 		if (!vm_page_none_valid(m)) {
 			ASSERT3U(m->valid, ==, VM_PAGE_BITS_ALL);
-			vm_page_do_sunbusy(m);
+			vm_page_sunbusy(m);
 			break;
 		}
 		ASSERT3U(m->dirty, ==, 0);
@@ -189,13 +175,11 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
 		memcpy(va, (char *)db->db_data + bufoff, PAGESIZE);
 		zfs_unmap_page(sf);
 		vm_page_valid(m);
-		dmu_page_lock(m);
 		if ((m->busy_lock & VPB_BIT_WAITERS) != 0)
 			vm_page_activate(m);
 		else
 			vm_page_deactivate(m);
-		dmu_page_unlock(m);
-		vm_page_do_sunbusy(m);
+		vm_page_sunbusy(m);
 	}
 	*rbehind = i;
 
@@ -296,7 +280,7 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
 			break;
 		if (!vm_page_none_valid(m)) {
 			ASSERT3U(m->valid, ==, VM_PAGE_BITS_ALL);
-			vm_page_do_sunbusy(m);
+			vm_page_sunbusy(m);
 			break;
 		}
 		ASSERT3U(m->dirty, ==, 0);
@@ -314,16 +298,13 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
 		}
 		zfs_unmap_page(sf);
 		vm_page_valid(m);
-		dmu_page_lock(m);
 		if ((m->busy_lock & VPB_BIT_WAITERS) != 0)
 			vm_page_activate(m);
 		else
 			vm_page_deactivate(m);
-		dmu_page_unlock(m);
-		vm_page_do_sunbusy(m);
+		vm_page_sunbusy(m);
 	}
 	*rahead = i;
-	zfs_vmobject_wunlock_12(vmobj);
 
 	dmu_buf_rele_array(dbp, numbufs, FTAG);
 	return (0);
diff --git a/module/os/freebsd/zfs/event_os.c b/module/os/freebsd/zfs/event_os.c
index e774fbaaf8..ace0fa7340 100644
--- a/module/os/freebsd/zfs/event_os.c
+++ b/module/os/freebsd/zfs/event_os.c
@@ -46,7 +46,6 @@ knlist_sx_xunlock(void *arg)
 	sx_xunlock((struct sx *)arg);
 }
 
-#if __FreeBSD_version >= 1300128
 static void
 knlist_sx_assert_lock(void *arg, int what)
 {
@@ -56,28 +55,10 @@ knlist_sx_assert_lock(void *arg, int what)
 	else
 		sx_assert((struct sx *)arg, SX_UNLOCKED);
 }
-#else
-static void
-knlist_sx_assert_locked(void *arg)
-{
-	sx_assert((struct sx *)arg, SX_LOCKED);
-}
-static void
-knlist_sx_assert_unlocked(void *arg)
-{
-	sx_assert((struct sx *)arg, SX_UNLOCKED);
-}
-#endif
 
 void
 knlist_init_sx(struct knlist *knl, struct sx *lock)
 {
-
-#if __FreeBSD_version >= 1300128
 	knlist_init(knl, lock, knlist_sx_xlock, knlist_sx_xunlock,
 	    knlist_sx_assert_lock);
-#else
-	knlist_init(knl, lock, knlist_sx_xlock, knlist_sx_xunlock,
-	    knlist_sx_assert_locked, knlist_sx_assert_unlocked);
-#endif
 }
diff --git a/module/os/freebsd/zfs/kmod_core.c b/module/os/freebsd/zfs/kmod_core.c
index 9bd0c9ed81..f883599f2d 100644
--- a/module/os/freebsd/zfs/kmod_core.c
+++ b/module/os/freebsd/zfs/kmod_core.c
@@ -345,11 +345,7 @@ FEATURE(zfs, "OpenZFS support");
 
 DECLARE_MODULE(zfsctrl, zfs_mod, SI_SUB_CLOCKS, SI_ORDER_ANY);
 MODULE_VERSION(zfsctrl, 1);
-#if __FreeBSD_version > 1300092
 MODULE_DEPEND(zfsctrl, xdr, 1, 1, 1);
-#else
-MODULE_DEPEND(zfsctrl, krpc, 1, 1, 1);
-#endif
 MODULE_DEPEND(zfsctrl, acl_nfs4, 1, 1, 1);
 MODULE_DEPEND(zfsctrl, crypto, 1, 1, 1);
 MODULE_DEPEND(zfsctrl, zlib, 1, 1, 1);
diff --git a/module/os/freebsd/zfs/vdev_geom.c b/module/os/freebsd/zfs/vdev_geom.c
index 38c1d8e9e4..b7ff1063b0 100644
--- a/module/os/freebsd/zfs/vdev_geom.c
+++ b/module/os/freebsd/zfs/vdev_geom.c
@@ -379,11 +379,7 @@ vdev_geom_io(struct g_consumer *cp, int *cmds, void **datas, off_t *offsets,
 	int i, n_bios, j;
 	size_t bios_size;
 
-#if __FreeBSD_version > 1300130
 	maxio = maxphys - (maxphys % cp->provider->sectorsize);
-#else
-	maxio = MAXPHYS - (MAXPHYS % cp->provider->sectorsize);
-#endif
 	n_bios = 0;
 
 	/* How many bios are required for all commands ? */
diff --git a/module/os/freebsd/zfs/zfs_ctldir.c b/module/os/freebsd/zfs/zfs_ctldir.c
index a753e91da4..4d53946188 100644
--- a/module/os/freebsd/zfs/zfs_ctldir.c
+++ b/module/os/freebsd/zfs/zfs_ctldir.c
@@ -733,7 +733,7 @@ zfsctl_root_vptocnp(struct vop_vptocnp_args *ap)
 	if (error != 0)
 		return (SET_ERROR(error));
 
-	VOP_UNLOCK1(dvp);
+	VOP_UNLOCK(dvp);
 	*ap->a_vpp = dvp;
 	*ap->a_buflen -= sizeof (dotzfs_name);
 	memcpy(ap->a_buf + *ap->a_buflen, dotzfs_name, sizeof (dotzfs_name));
@@ -814,12 +814,8 @@ zfsctl_common_getacl(struct vop_getacl_args *ap)
 
 static struct vop_vector zfsctl_ops_root = {
 	.vop_default =	&default_vnodeops,
-#if __FreeBSD_version >= 1300121
 	.vop_fplookup_vexec = VOP_EAGAIN,
-#endif
-#if __FreeBSD_version >= 1300139
 	.vop_fplookup_symlink = VOP_EAGAIN,
-#endif
 	.vop_open =	zfsctl_common_open,
 	.vop_close =	zfsctl_common_close,
 	.vop_ioctl =	VOP_EINVAL,
@@ -1146,12 +1142,8 @@ zfsctl_snapdir_getattr(struct vop_getattr_args *ap)
 
 static struct vop_vector zfsctl_ops_snapdir = {
 	.vop_default =	&default_vnodeops,
-#if __FreeBSD_version >= 1300121
 	.vop_fplookup_vexec = VOP_EAGAIN,
-#endif
-#if __FreeBSD_version >= 1300139
 	.vop_fplookup_symlink = VOP_EAGAIN,
-#endif
 	.vop_open =	zfsctl_common_open,
 	.vop_close =	zfsctl_common_close,
 	.vop_getattr =	zfsctl_snapdir_getattr,
@@ -1226,27 +1218,19 @@ zfsctl_snapshot_vptocnp(struct vop_vptocnp_args *ap)
 	 * before we can lock the vnode again.
 	 */
 	locked = VOP_ISLOCKED(vp);
-#if __FreeBSD_version >= 1300045
 	enum vgetstate vs = vget_prep(vp);
-#else
-	vhold(vp);
-#endif
 	vput(vp);
 
 	/* Look up .zfs/snapshot, our parent. */
 	error = zfsctl_snapdir_vnode(vp->v_mount, NULL, LK_SHARED, &dvp);
 	if (error == 0) {
-		VOP_UNLOCK1(dvp);
+		VOP_UNLOCK(dvp);
 		*ap->a_vpp = dvp;
 		*ap->a_buflen -= len;
 		memcpy(ap->a_buf + *ap->a_buflen, node->sn_name, len);
 	}
 	vfs_unbusy(mp);
-#if __FreeBSD_version >= 1300045
 	vget_finish(vp, locked | LK_RETRY, vs);
-#else
-	vget(vp, locked | LK_VNHELD | LK_RETRY, curthread);
-#endif
 	return (error);
 }
 
@@ -1256,18 +1240,12 @@ zfsctl_snapshot_vptocnp(struct vop_vptocnp_args *ap)
  */
 static struct vop_vector zfsctl_ops_snapshot = {
 	.vop_default =		NULL, /* ensure very restricted access */
-#if __FreeBSD_version >= 1300121
 	.vop_fplookup_vexec =	VOP_EAGAIN,
-#endif
-#if __FreeBSD_version >= 1300139
 	.vop_fplookup_symlink = VOP_EAGAIN,
-#endif
 	.vop_open =		zfsctl_common_open,
 	.vop_close =		zfsctl_common_close,
 	.vop_inactive =		zfsctl_snapshot_inactive,
-#if __FreeBSD_version >= 1300045
-	.vop_need_inactive = vop_stdneed_inactive,
-#endif
+	.vop_need_inactive =	vop_stdneed_inactive,
 	.vop_reclaim =		zfsctl_snapshot_reclaim,
 	.vop_vptocnp =		zfsctl_snapshot_vptocnp,
 	.vop_lock1 =		vop_stdlock,
diff --git a/module/os/freebsd/zfs/zfs_dir.c b/module/os/freebsd/zfs/zfs_dir.c
index 3cdb94d6cd..00d499c8c6 100644
--- a/module/os/freebsd/zfs/zfs_dir.c
+++ b/module/os/freebsd/zfs/zfs_dir.c
@@ -824,7 +824,7 @@ zfs_make_xattrdir(znode_t *zp, vattr_t *vap, znode_t **xvpp, cred_t *cr)
 		return (SET_ERROR(EDQUOT));
 	}
 
-	getnewvnode_reserve_();
+	getnewvnode_reserve();
 
 	tx = dmu_tx_create(zfsvfs->z_os);
 	dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
@@ -926,7 +926,7 @@ top:
 		goto top;
 	}
 	if (error == 0)
-		VOP_UNLOCK1(ZTOV(*xzpp));
+		VOP_UNLOCK(ZTOV(*xzpp));
 
 	return (error);
 }
diff --git a/module/os/freebsd/zfs/zfs_file_os.c b/module/os/freebsd/zfs/zfs_file_os.c
index b337932b9d..bdb8c4fac7 100644
--- a/module/os/freebsd/zfs/zfs_file_os.c
+++ b/module/os/freebsd/zfs/zfs_file_os.c
@@ -270,7 +270,7 @@ zfs_vop_fsync(vnode_t *vp)
 		goto drop;
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	error = VOP_FSYNC(vp, MNT_WAIT, curthread);
-	VOP_UNLOCK1(vp);
+	VOP_UNLOCK(vp);
 	vn_finished_write(mp);
 drop:
 	return (SET_ERROR(error));
@@ -330,14 +330,6 @@ zfs_file_unlink(const char *fnamep)
 	zfs_uio_seg_t seg = UIO_SYSSPACE;
 	int rc;
 
-#if __FreeBSD_version >= 1300018
 	rc = kern_funlinkat(curthread, AT_FDCWD, fnamep, FD_NONE, seg, 0, 0);
-#elif __FreeBSD_version >= 1202504 || defined(AT_BENEATH)
-	rc = kern_unlinkat(curthread, AT_FDCWD, __DECONST(char *, fnamep),
-	    seg, 0, 0);
-#else
-	rc = kern_unlinkat(curthread, AT_FDCWD, __DECONST(char *, fnamep),
-	    seg, 0);
-#endif
 	return (SET_ERROR(rc));
 }
diff --git a/module/os/freebsd/zfs/zfs_ioctl_os.c b/module/os/freebsd/zfs/zfs_ioctl_os.c
index b8f5fa4e75..928cf25e94 100644
--- a/module/os/freebsd/zfs/zfs_ioctl_os.c
+++ b/module/os/freebsd/zfs/zfs_ioctl_os.c
@@ -36,10 +36,6 @@
 
 #include <sys/zfs_ioctl_impl.h>
 
-#if __FreeBSD_version < 1201517
-#define	vm_page_max_user_wired	vm_page_max_wired
-#endif
-
 int
 zfs_vfs_ref(zfsvfs_t **zfvp)
 {
diff --git a/module/os/freebsd/zfs/zfs_vfsops.c b/module/os/freebsd/zfs/zfs_vfsops.c
index a972c720df..a601954935 100644
--- a/module/os/freebsd/zfs/zfs_vfsops.c
+++ b/module/os/freebsd/zfs/zfs_vfsops.c
@@ -126,25 +126,16 @@ static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp);
 static int zfs_statfs(vfs_t *vfsp, struct statfs *statp);
 static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp);
 static int zfs_sync(vfs_t *vfsp, int waitfor);
-#if __FreeBSD_version >= 1300098
 static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, uint64_t *extflagsp,
     struct ucred **credanonp, int *numsecflavors, int *secflavors);
-#else
-static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
-    struct ucred **credanonp, int *numsecflavors, int **secflavors);
-#endif
 static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp);
 static void zfs_freevfs(vfs_t *vfsp);
 
 struct vfsops zfs_vfsops = {
 	.vfs_mount =		zfs_mount,
 	.vfs_unmount =		zfs_umount,
-#if __FreeBSD_version >= 1300049
 	.vfs_root =		vfs_cache_root,
-	.vfs_cachedroot = zfs_root,
-#else
-	.vfs_root =		zfs_root,
-#endif
+	.vfs_cachedroot =	zfs_root,
 	.vfs_statfs =		zfs_statfs,
 	.vfs_vget =		zfs_vget,
 	.vfs_sync =		zfs_sync,
@@ -1357,16 +1348,16 @@ zfs_mount(vfs_t *vfsp)
 
 			vn_lock(mvp, LK_SHARED | LK_RETRY);
 			if (VOP_GETATTR(mvp, &vattr, cr)) {
-				VOP_UNLOCK1(mvp);
+				VOP_UNLOCK(mvp);
 				goto out;
 			}
 
 			if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
 			    VOP_ACCESS(mvp, VWRITE, cr, td) != 0) {
-				VOP_UNLOCK1(mvp);
+				VOP_UNLOCK(mvp);
 				goto out;
 			}
-			VOP_UNLOCK1(mvp);
+			VOP_UNLOCK(mvp);
 		}
 
 		secpolicy_fs_mount_clearopts(cr, vfsp);
@@ -1578,11 +1569,7 @@ zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
 		 * 'z_parent' is self referential for non-snapshots.
 		 */
 #ifdef FREEBSD_NAMECACHE
-#if __FreeBSD_version >= 1300117
 		cache_purgevfs(zfsvfs->z_parent->z_vfs);
-#else
-		cache_purgevfs(zfsvfs->z_parent->z_vfs, true);
-#endif
 #endif
 	}
 
@@ -1775,13 +1762,8 @@ zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp)
 }
 
 static int
-#if __FreeBSD_version >= 1300098
 zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, uint64_t *extflagsp,
     struct ucred **credanonp, int *numsecflavors, int *secflavors)
-#else
-zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
-    struct ucred **credanonp, int *numsecflavors, int **secflavors)
-#endif
 {
 	zfsvfs_t *zfsvfs = vfsp->vfs_data;
 
@@ -2070,10 +2052,8 @@ zfs_vnodes_adjust_back(void)
 #endif
 }
 
-#if __FreeBSD_version >= 1300139
 static struct sx zfs_vnlru_lock;
 static struct vnode *zfs_vnlru_marker;
-#endif
 static arc_prune_t *zfs_prune;
 
 static void
@@ -2081,13 +2061,9 @@ zfs_prune_task(uint64_t nr_to_scan, void *arg __unused)
 {
 	if (nr_to_scan > INT_MAX)
 		nr_to_scan = INT_MAX;
-#if __FreeBSD_version >= 1300139
 	sx_xlock(&zfs_vnlru_lock);
 	vnlru_free_vfsops(nr_to_scan, &zfs_vfsops, zfs_vnlru_marker);
 	sx_xunlock(&zfs_vnlru_lock);
-#else
-	vnlru_free(nr_to_scan, &zfs_vfsops);
-#endif
 }
 
 void
@@ -2117,10 +2093,8 @@ zfs_init(void)
 
 	zfsvfs_taskq = taskq_create("zfsvfs", 1, minclsyspri, 0, 0, 0);
 
-#if __FreeBSD_version >= 1300139
 	zfs_vnlru_marker = vnlru_alloc_marker();
 	sx_init(&zfs_vnlru_lock, "zfs vnlru lock");
-#endif
 	zfs_prune = arc_add_prune_callback(zfs_prune_task, NULL);
 }
 
@@ -2128,10 +2102,8 @@ void
 zfs_fini(void)
 {
 	arc_remove_prune_callback(zfs_prune);
-#if __FreeBSD_version >= 1300139
 	vnlru_free_marker(zfs_vnlru_marker);
 	sx_destroy(&zfs_vnlru_lock);
-#endif
 
 	taskq_destroy(zfsvfs_taskq);
 	zfsctl_fini();
diff --git a/module/os/freebsd/zfs/zfs_vnops_os.c b/module/os/freebsd/zfs/zfs_vnops_os.c
index b9b332434b..fd36dbd300 100644
--- a/module/os/freebsd/zfs/zfs_vnops_os.c
+++ b/module/os/freebsd/zfs/zfs_vnops_os.c
@@ -39,9 +39,7 @@
 #include <sys/endian.h>
 #include <sys/vm.h>
 #include <sys/vnode.h>
-#if __FreeBSD_version >= 1300102
 #include <sys/smr.h>
-#endif
 #include <sys/dirent.h>
 #include <sys/file.h>
 #include <sys/stat.h>
@@ -100,18 +98,6 @@
 
 VFS_SMR_DECLARE;
 
-#if __FreeBSD_version < 1300103
-#define	NDFREE_PNBUF(ndp)	NDFREE((ndp), NDF_ONLY_PNBUF)
-#endif
-
-#if __FreeBSD_version >= 1300047
-#define	vm_page_wire_lock(pp)
-#define	vm_page_wire_unlock(pp)
-#else
-#define	vm_page_wire_lock(pp) vm_page_lock(pp)
-#define	vm_page_wire_unlock(pp) vm_page_unlock(pp)
-#endif
-
 #ifdef DEBUG_VFS_LOCKS
 #define	VNCHECKREF(vp)				  \
 	VNASSERT((vp)->v_holdcnt > 0 && (vp)->v_usecount > 0, vp,	\
@@ -338,39 +324,6 @@ page_busy(vnode_t *vp, int64_t start, int64_t off, int64_t nbytes)
 	nbytes = end - off;
 
 	obj = vp->v_object;
-	zfs_vmobject_assert_wlocked_12(obj);
-#if __FreeBSD_version < 1300050
-	for (;;) {
-		if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL &&
-		    pp->valid) {
-			if (vm_page_xbusied(pp)) {
-				/*
-				 * Reference the page before unlocking and
-				 * sleeping so that the page daemon is less
-				 * likely to reclaim it.
-				 */
-				vm_page_reference(pp);
-				vm_page_lock(pp);
-				zfs_vmobject_wunlock(obj);
-				vm_page_busy_sleep(pp, "zfsmwb", true);
-				zfs_vmobject_wlock(obj);
-				continue;
-			}
-			vm_page_sbusy(pp);
-		} else if (pp != NULL) {
-			ASSERT(!pp->valid);
-			pp = NULL;
-		}
-		if (pp != NULL) {
-			ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
-			vm_object_pip_add(obj, 1);
-			pmap_remove_write(pp);
-			if (nbytes != 0)
-				vm_page_clear_dirty(pp, off, nbytes);
-		}
-		break;
-	}
-#else
 	vm_page_grab_valid_unlocked(&pp, obj, OFF_TO_IDX(start),
 	    VM_ALLOC_NOCREAT | VM_ALLOC_SBUSY | VM_ALLOC_NORMAL |
 	    VM_ALLOC_IGN_SBUSY);
@@ -381,7 +334,6 @@ page_busy(vnode_t *vp, int64_t start, int64_t off, int64_t nbytes)
 		if (nbytes != 0)
 			vm_page_clear_dirty(pp, off, nbytes);
 	}
-#endif
 	return (pp);
 }
 
@@ -390,14 +342,9 @@ page_unbusy(vm_page_t pp)
 {
 
 	vm_page_sunbusy(pp);
-#if __FreeBSD_version >= 1300041
 	vm_object_pip_wakeup(pp->object);
-#else
-	vm_object_pip_subtract(pp->object, 1);
-#endif
 }
 
-#if __FreeBSD_version > 1300051
 static vm_page_t
 page_hold(vnode_t *vp, int64_t start)
 {
@@ -410,57 +357,11 @@ page_hold(vnode_t *vp, int64_t start)
 	    VM_ALLOC_NOBUSY);
 	return (m);
 }
-#else
-static vm_page_t
-page_hold(vnode_t *vp, int64_t start)
-{
-	vm_object_t obj;
-	vm_page_t pp;
-
-	obj = vp->v_object;
-	zfs_vmobject_assert_wlocked(obj);
-
-	for (;;) {
-		if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL &&
-		    pp->valid) {
-			if (vm_page_xbusied(pp)) {
-				/*
-				 * Reference the page before unlocking and
-				 * sleeping so that the page daemon is less
-				 * likely to reclaim it.
-				 */
-				vm_page_reference(pp);
-				vm_page_lock(pp);
-				zfs_vmobject_wunlock(obj);
-				vm_page_busy_sleep(pp, "zfsmwb", true);
-				zfs_vmobject_wlock(obj);
-				continue;
-			}
-
-			ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
-			vm_page_wire_lock(pp);
-			vm_page_hold(pp);
-			vm_page_wire_unlock(pp);
-
-		} else
-			pp = NULL;
-		break;
-	}
-	return (pp);
-}
-#endif
 
 static void
 page_unhold(vm_page_t pp)
 {
-
-	vm_page_wire_lock(pp);
-#if __FreeBSD_version >= 1300035
 	vm_page_unwire(pp, PQ_ACTIVE);
-#else
-	vm_page_unhold(pp);
-#endif
-	vm_page_wire_unlock(pp);
 }
 
 /*
@@ -484,34 +385,22 @@ update_pages(znode_t *zp, int64_t start, int len, objset_t *os)
 	ASSERT3P(obj, !=, NULL);
 
 	off = start & PAGEOFFSET;
-	zfs_vmobject_wlock_12(obj);
-#if __FreeBSD_version >= 1300041
 	vm_object_pip_add(obj, 1);
-#endif
 	for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
 		vm_page_t pp;
 		int nbytes = imin(PAGESIZE - off, len);
 
 		if ((pp = page_busy(vp, start, off, nbytes)) != NULL) {
-			zfs_vmobject_wunlock_12(obj);
-
 			va = zfs_map_page(pp, &sf);
 			(void) dmu_read(os, zp->z_id, start + off, nbytes,
 			    va + off, DMU_READ_PREFETCH);
 			zfs_unmap_page(sf);
-
-			zfs_vmobject_wlock_12(obj);
 			page_unbusy(pp);
 		}
 		len -= nbytes;
 		off = 0;
 	}
-#if __FreeBSD_version >= 1300041
 	vm_object_pip_wakeup(obj);
-#else
-	vm_object_pip_wakeupn(obj, 0);
-#endif
-	zfs_vmobject_wunlock_12(obj);
 }
 
 /*
@@ -542,26 +431,22 @@ mappedread_sf(znode_t *zp, int nbytes, zfs_uio_t *uio)
 	ASSERT3P(obj, !=, NULL);
 	ASSERT0(zfs_uio_offset(uio) & PAGEOFFSET);
 
-	zfs_vmobject_wlock_12(obj);
 	for (start = zfs_uio_offset(uio); len > 0; start += PAGESIZE) {
 		int bytes = MIN(PAGESIZE, len);
 
 		pp = vm_page_grab_unlocked(obj, OFF_TO_IDX(start),
 		    VM_ALLOC_SBUSY | VM_ALLOC_NORMAL | VM_ALLOC_IGN_SBUSY);
 		if (vm_page_none_valid(pp)) {
-			zfs_vmobject_wunlock_12(obj);
 			va = zfs_map_page(pp, &sf);
 			error = dmu_read(os, zp->z_id, start, bytes, va,
 			    DMU_READ_PREFETCH);
 			if (bytes != PAGESIZE && error == 0)
 				memset(va + bytes, 0, PAGESIZE - bytes);
 			zfs_unmap_page(sf);
-			zfs_vmobject_wlock_12(obj);
-#if  __FreeBSD_version >= 1300081
 			if (error == 0) {
 				vm_page_valid(pp);
 				vm_page_activate(pp);
-				vm_page_do_sunbusy(pp);
+				vm_page_sunbusy(pp);
 			} else {
 				zfs_vmobject_wlock(obj);
 				if (!vm_page_wired(pp) && pp->valid == 0 &&
@@ -571,29 +456,15 @@ mappedread_sf(znode_t *zp, int nbytes, zfs_uio_t *uio)
 					vm_page_sunbusy(pp);
 				zfs_vmobject_wunlock(obj);
 			}
-#else
-			vm_page_do_sunbusy(pp);
-			vm_page_lock(pp);
-			if (error) {
-				if (pp->wire_count == 0 && pp->valid == 0 &&
-				    !vm_page_busied(pp))
-					vm_page_free(pp);
-			} else {
-				pp->valid = VM_PAGE_BITS_ALL;
-				vm_page_activate(pp);
-			}
-			vm_page_unlock(pp);
-#endif
 		} else {
 			ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
-			vm_page_do_sunbusy(pp);
+			vm_page_sunbusy(pp);
 		}
 		if (error)
 			break;
 		zfs_uio_advance(uio, bytes);
 		len -= bytes;
 	}
-	zfs_vmobject_wunlock_12(obj);
 	return (error);
 }
 
@@ -623,7 +494,6 @@ mappedread(znode_t *zp, int nbytes, zfs_uio_t *uio)
 
 	start = zfs_uio_offset(uio);
 	off = start & PAGEOFFSET;
-	zfs_vmobject_wlock_12(obj);
 	for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
 		vm_page_t pp;
 		uint64_t bytes = MIN(PAGESIZE - off, len);
@@ -632,25 +502,20 @@ mappedread(znode_t *zp, int nbytes, zfs_uio_t *uio)
 			struct sf_buf *sf;
 			caddr_t va;
 
-			zfs_vmobject_wunlock_12(obj);
 			va = zfs_map_page(pp, &sf);
 			error = vn_io_fault_uiomove(va + off, bytes,
 			    GET_UIO_STRUCT(uio));
 			zfs_unmap_page(sf);
-			zfs_vmobject_wlock_12(obj);
 			page_unhold(pp);
 		} else {
-			zfs_vmobject_wunlock_12(obj);
 			error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
 			    uio, bytes);
-			zfs_vmobject_wlock_12(obj);
 		}
 		len -= bytes;
 		off = 0;
 		if (error)
 			break;
 	}
-	zfs_vmobject_wunlock_12(obj);
 	return (error);
 }
 
@@ -786,9 +651,7 @@ zfs_lookup(vnode_t *dvp, const char *nm, vnode_t **vpp,
 	znode_t *zdp = VTOZ(dvp);
 	znode_t *zp;
 	zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
-#if	__FreeBSD_version > 1300124
 	seqc_t dvp_seqc;
-#endif
 	int	error = 0;
 
 	/*
@@ -814,9 +677,7 @@ zfs_lookup(vnode_t *dvp, const char *nm, vnode_t **vpp,
 	if ((error = zfs_enter_verify_zp(zfsvfs, zdp, FTAG)) != 0)
 		return (error);
 
-#if	__FreeBSD_version > 1300124
 	dvp_seqc = vn_seqc_read_notmodify(dvp);
-#endif
 
 	*vpp = NULL;
 
@@ -895,7 +756,7 @@ zfs_lookup(vnode_t *dvp, const char *nm, vnode_t **vpp,
 
 			zfs_exit(zfsvfs, FTAG);
 			ltype = VOP_ISLOCKED(dvp);
-			VOP_UNLOCK1(dvp);
+			VOP_UNLOCK(dvp);
 			error = zfsctl_root(zfsvfs->z_parent, LK_SHARED,
 			    &zfsctl_vp);
 			if (error == 0) {
@@ -996,7 +857,6 @@ zfs_lookup(vnode_t *dvp, const char *nm, vnode_t **vpp,
 		}
 	}
 
-#if	__FreeBSD_version > 1300124
 	if ((cnp->cn_flags & ISDOTDOT) != 0) {
 		/*
 		 * FIXME: zfs_lookup_lock relocks vnodes and does nothing to
@@ -1014,7 +874,6 @@ zfs_lookup(vnode_t *dvp, const char *nm, vnode_t **vpp,
 			cnp->cn_flags &= ~MAKEENTRY;
 		}
 	}
-#endif
 
 	/* Insert name into cache (as non-existent) if appropriate. */
 	if (zfsvfs->z_use_namecache && !zfsvfs->z_replay &&
@@ -1149,7 +1008,7 @@ zfs_create(znode_t *dzp, const char *name, vattr_t *vap, int excl, int mode,
 		goto out;
 	}
 
-	getnewvnode_reserve_();
+	getnewvnode_reserve();
 
 	tx = dmu_tx_create(os);
 
@@ -1183,7 +1042,7 @@ zfs_create(znode_t *dzp, const char *name, vattr_t *vap, int excl, int mode,
 		 * delete the newly created dnode.
 		 */
 		zfs_znode_delete(zp, tx);
-		VOP_UNLOCK1(ZTOV(zp));
+		VOP_UNLOCK(ZTOV(zp));
 		zrele(zp);
 		zfs_acl_ids_free(&acl_ids);
 		dmu_tx_commit(tx);
@@ -1512,7 +1371,7 @@ zfs_mkdir(znode_t *dzp, const char *dirname, vattr_t *vap, znode_t **zpp,
 	/*
 	 * Add a new entry to the directory.
 	 */
-	getnewvnode_reserve_();
+	getnewvnode_reserve();
 	tx = dmu_tx_create(zfsvfs->z_os);
 	dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
 	dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
@@ -1547,7 +1406,7 @@ zfs_mkdir(znode_t *dzp, const char *dirname, vattr_t *vap, znode_t **zpp,
 	error = zfs_link_create(dzp, dirname, zp, tx, ZNEW);
 	if (error != 0) {
 		zfs_znode_delete(zp, tx);
-		VOP_UNLOCK1(ZTOV(zp));
+		VOP_UNLOCK(ZTOV(zp));
 		zrele(zp);
 		goto out;
 	}
@@ -1575,16 +1434,6 @@ out:
 	return (error);
 }
 
-#if	__FreeBSD_version < 1300124
-static void
-cache_vop_rmdir(struct vnode *dvp, struct vnode *vp)
-{
-
-	cache_purge(dvp);
-	cache_purge(vp);
-}
-#endif
-
 /*
  * Remove a directory subdir entry.  If the current working
  * directory is the same as the subdir to be removed, the
@@ -2984,9 +2833,9 @@ zfs_rename_relock(struct vnode *sdvp, struct vnode **svpp,
 	znode_t		*sdzp, *tdzp, *szp, *tzp;
 	int		error;
 
-	VOP_UNLOCK1(tdvp);
+	VOP_UNLOCK(tdvp);
 	if (*tvpp != NULL && *tvpp != tdvp)
-		VOP_UNLOCK1(*tvpp);
+		VOP_UNLOCK(*tvpp);
 
 relock:
 	error = vn_lock(sdvp, LK_EXCLUSIVE);
@@ -2994,13 +2843,13 @@ relock:
 		goto out;
 	error = vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT);
 	if (error != 0) {
-		VOP_UNLOCK1(sdvp);
+		VOP_UNLOCK(sdvp);
 		if (error != EBUSY)
 			goto out;
 		error = vn_lock(tdvp, LK_EXCLUSIVE);
 		if (error)
 			goto out;
-		VOP_UNLOCK1(tdvp);
+		VOP_UNLOCK(tdvp);
 		goto relock;
 	}
 	tdzp = VTOZ(tdvp);
@@ -3008,8 +2857,8 @@ relock:
 
 	error = zfs_rename_relock_lookup(sdzp, scnp, &szp, tdzp, tcnp, &tzp);
 	if (error != 0) {
-		VOP_UNLOCK1(sdvp);
-		VOP_UNLOCK1(tdvp);
+		VOP_UNLOCK(sdvp);
+		VOP_UNLOCK(tdvp);
 		goto out;
 	}
 	svp = ZTOV(szp);
@@ -3021,8 +2870,8 @@ relock:
 	nvp = svp;
 	error = vn_lock(nvp, LK_EXCLUSIVE | LK_NOWAIT);
 	if (error != 0) {
-		VOP_UNLOCK1(sdvp);
-		VOP_UNLOCK1(tdvp);
+		VOP_UNLOCK(sdvp);
+		VOP_UNLOCK(tdvp);
 		if (tvp != NULL)
 			vrele(tvp);
 		if (error != EBUSY) {
@@ -3034,7 +2883,7 @@ relock:
 			vrele(nvp);
 			goto out;
 		}
-		VOP_UNLOCK1(nvp);
+		VOP_UNLOCK(nvp);
 		/*
 		 * Concurrent rename race.
 		 * XXX ?
@@ -3058,9 +2907,9 @@ relock:
 		nvp = tvp;
 		error = vn_lock(nvp, LK_EXCLUSIVE | LK_NOWAIT);
 		if (error != 0) {
-			VOP_UNLOCK1(sdvp);
-			VOP_UNLOCK1(tdvp);
-			VOP_UNLOCK1(*svpp);
+			VOP_UNLOCK(sdvp);
+			VOP_UNLOCK(tdvp);
+			VOP_UNLOCK(*svpp);
 			if (error != EBUSY) {
 				vrele(nvp);
 				goto out;
@@ -3137,19 +2986,6 @@ zfs_rename_check(znode_t *szp, znode_t *sdzp, znode_t *tdzp)
 	return (error);
 }
 
-#if	__FreeBSD_version < 1300124
-static void
-cache_vop_rename(struct vnode *fdvp, struct vnode *fvp, struct vnode *tdvp,
-    struct vnode *tvp, struct componentname *fcnp, struct componentname *tcnp)
-{
-
-	cache_purge(fvp);
-	if (tvp != NULL)
-		cache_purge(tvp);
-	cache_purge_negative(tdvp);
-}
-#endif
-
 static int
 zfs_do_rename_impl(vnode_t *sdvp, vnode_t **svpp, struct componentname *scnp,
     vnode_t *tdvp, vnode_t **tvpp, struct componentname *tcnp,
@@ -3205,13 +3041,13 @@ zfs_do_rename(vnode_t *sdvp, vnode_t **svpp, struct componentname *scnp,
 	}
 
 	error = zfs_do_rename_impl(sdvp, svpp, scnp, tdvp, tvpp, tcnp, cr);
-	VOP_UNLOCK1(sdvp);
-	VOP_UNLOCK1(*svpp);
+	VOP_UNLOCK(sdvp);
+	VOP_UNLOCK(*svpp);
 out:
 	if (*tvpp != NULL)
-		VOP_UNLOCK1(*tvpp);
+		VOP_UNLOCK(*tvpp);
 	if (tdvp != *tvpp)
-		VOP_UNLOCK1(tdvp);
+		VOP_UNLOCK(tdvp);
 
 	return (error);
 }
@@ -3463,17 +3299,17 @@ zfs_rename(znode_t *sdzp, const char *sname, znode_t *tdzp, const char *tname,
 	tdvp = ZTOV(tdzp);
 	error = zfs_lookup_internal(sdzp, sname, &svp, &scn, DELETE);
 	if (sdzp->z_zfsvfs->z_replay == B_FALSE)
-		VOP_UNLOCK1(sdvp);
+		VOP_UNLOCK(sdvp);
 	if (error != 0)
 		goto fail;
-	VOP_UNLOCK1(svp);
+	VOP_UNLOCK(svp);
 
 	vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY);
 	error = zfs_lookup_internal(tdzp, tname, &tvp, &tcn, RENAME);
 	if (error == EJUSTRETURN)
 		tvp = NULL;
 	else if (error != 0) {
-		VOP_UNLOCK1(tdvp);
+		VOP_UNLOCK(tdvp);
 		goto fail;
 	}
 
@@ -3564,7 +3400,7 @@ zfs_symlink(znode_t *dzp, const char *name, vattr_t *vap,
 		return (SET_ERROR(EDQUOT));
 	}
 
-	getnewvnode_reserve_();
+	getnewvnode_reserve();
 	tx = dmu_tx_create(zfsvfs->z_os);
 	fuid_dirtied = zfsvfs->z_fuid_dirty;
 	dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
@@ -3611,7 +3447,7 @@ zfs_symlink(znode_t *dzp, const char *name, vattr_t *vap,
 	error = zfs_link_create(dzp, name, zp, tx, ZNEW);
 	if (error != 0) {
 		zfs_znode_delete(zp, tx);
-		VOP_UNLOCK1(ZTOV(zp));
+		VOP_UNLOCK(ZTOV(zp));
 		zrele(zp);
 	} else {
 		zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
@@ -4472,7 +4308,6 @@ zfs_freebsd_write(struct vop_write_args *ap)
 	    ap->a_cred));
 }
 
-#if __FreeBSD_version >= 1300102
 /*
  * VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see
  * the comment above cache_fplookup for details.
@@ -4497,9 +4332,7 @@ zfs_freebsd_fplookup_vexec(struct vop_fplookup_vexec_args *v)
 		return (EAGAIN);
 	return (0);
 }
-#endif
 
-#if __FreeBSD_version >= 1300139
 static int
 zfs_freebsd_fplookup_symlink(struct vop_fplookup_symlink_args *v)
 {
@@ -4519,7 +4352,6 @@ zfs_freebsd_fplookup_symlink(struct vop_fplookup_symlink_args *v)
 	}
 	return (cache_symlink_resolve(v->a_fpl, target, strlen(target)));
 }
-#endif
 
 #ifndef _SYS_SYSPROTO_H_
 struct vop_access_args {
@@ -4557,13 +4389,8 @@ zfs_freebsd_access(struct vop_access_args *ap)
 	if (error == 0) {
 		accmode = ap->a_accmode & ~(VREAD|VWRITE|VEXEC|VAPPEND);
 		if (accmode != 0) {
-#if __FreeBSD_version >= 1300105
 			error = vaccess(vp->v_type, zp->z_mode, zp->z_uid,
 			    zp->z_gid, accmode, ap->a_cred);
-#else
-			error = vaccess(vp->v_type, zp->z_mode, zp->z_uid,
-			    zp->z_gid, accmode, ap->a_cred, NULL);
-#endif
 		}
 	}
 
@@ -4898,7 +4725,7 @@ zfs_freebsd_setattr(struct vop_setattr_args *ap)
 		 * otherwise, they behave like unprivileged processes.
 		 */
 		if (secpolicy_fs_owner(vp->v_mount, cred) == 0 ||
-		    spl_priv_check_cred(cred, PRIV_VFS_SYSFLAGS) == 0) {
+		    priv_check_cred(cred, PRIV_VFS_SYSFLAGS) == 0) {
 			if (zflags &
 			    (ZFS_IMMUTABLE | ZFS_APPENDONLY | ZFS_NOUNLINK)) {
 				error = securelevel_gt(cred, 0);
@@ -5017,10 +4844,8 @@ zfs_freebsd_symlink(struct vop_symlink_args *ap)
 	struct componentname *cnp = ap->a_cnp;
 	vattr_t *vap = ap->a_vap;
 	znode_t *zp = NULL;
-#if __FreeBSD_version >= 1300139
 	char *symlink;
 	size_t symlink_len;
-#endif
 	int rc;
 
 #if __FreeBSD_version < 1400068
@@ -5036,7 +4861,6 @@ zfs_freebsd_symlink(struct vop_symlink_args *ap)
 	if (rc == 0) {
 		*ap->a_vpp = ZTOV(zp);
 		ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
-#if __FreeBSD_version >= 1300139
 		MPASS(zp->z_cached_symlink == NULL);
 		symlink_len = strlen(ap->a_target);
 		symlink = cache_symlink_alloc(symlink_len + 1, M_WAITOK);
@@ -5046,7 +4870,6 @@ zfs_freebsd_symlink(struct vop_symlink_args *ap)
 			atomic_store_rel_ptr((uintptr_t *)&zp->z_cached_symlink,
 			    (uintptr_t)symlink);
 		}
-#endif
 	}
 	return (rc);
 }
@@ -5064,15 +4887,12 @@ zfs_freebsd_readlink(struct vop_readlink_args *ap)
 {
 	zfs_uio_t uio;
 	int error;
-#if __FreeBSD_version >= 1300139
 	znode_t	*zp = VTOZ(ap->a_vp);
 	char *symlink, *base;
 	size_t symlink_len;
 	bool trycache;
-#endif
 
 	zfs_uio_init(&uio, ap->a_uio);
-#if __FreeBSD_version >= 1300139
 	trycache = false;
 	if (zfs_uio_segflg(&uio) == UIO_SYSSPACE &&
 	    zfs_uio_iovcnt(&uio) == 1) {
@@ -5080,9 +4900,7 @@ zfs_freebsd_readlink(struct vop_readlink_args *ap)
 		symlink_len = zfs_uio_iovlen(&uio, 0);
 		trycache = true;
 	}
-#endif
 	error = zfs_readlink(ap->a_vp, &uio, ap->a_cred, NULL);
-#if __FreeBSD_version >= 1300139
 	if (atomic_load_ptr(&zp->z_cached_symlink) != NULL ||
 	    error != 0 || !trycache) {
 		return (error);
@@ -5097,7 +4915,6 @@ zfs_freebsd_readlink(struct vop_readlink_args *ap)
 			cache_symlink_free(symlink, symlink_len + 1);
 		}
 	}
-#endif
 	return (error);
 }
 
@@ -5139,15 +4956,10 @@ zfs_freebsd_inactive(struct vop_inactive_args *ap)
 {
 	vnode_t *vp = ap->a_vp;
 
-#if __FreeBSD_version >= 1300123
 	zfs_inactive(vp, curthread->td_ucred, NULL);
-#else
-	zfs_inactive(vp, ap->a_td->td_ucred, NULL);
-#endif
 	return (0);
 }
 
-#if __FreeBSD_version >= 1300042
 #ifndef _SYS_SYSPROTO_H_
 struct vop_need_inactive_args {
 	struct vnode *a_vp;
@@ -5173,7 +4985,6 @@ zfs_freebsd_need_inactive(struct vop_need_inactive_args *ap)
 
 	return (need);
 }
-#endif
 
 #ifndef _SYS_SYSPROTO_H_
 struct vop_reclaim_args {
@@ -5191,10 +5002,6 @@ zfs_freebsd_reclaim(struct vop_reclaim_args *ap)
 
 	ASSERT3P(zp, !=, NULL);
 
-#if __FreeBSD_version < 1300042
-	/* Destroy the vm object and flush associated pages. */
-	vnode_destroy_vobject(vp);
-#endif
 	/*
 	 * z_teardown_inactive_lock protects from a race with
 	 * zfs_znode_dmu_fini in zfsvfs_teardown during
@@ -5405,7 +5212,7 @@ zfs_getextattr_dir(struct vop_getextattr_args *ap, const char *attrname)
 	} else if (ap->a_uio != NULL)
 		error = VOP_READ(vp, ap->a_uio, IO_UNIT, ap->a_cred);
 
-	VOP_UNLOCK1(vp);
+	VOP_UNLOCK(vp);
 	vn_close(vp, flags, ap->a_cred, td);
 	return (error);
 }
@@ -5692,7 +5499,7 @@ zfs_setextattr_dir(struct vop_setextattr_args *ap, const char *attrname)
 	if (error == 0)
 		VOP_WRITE(vp, ap->a_uio, IO_UNIT, ap->a_cred);
 
-	VOP_UNLOCK1(vp);
+	VOP_UNLOCK(vp);
 	vn_close(vp, flags, ap->a_cred, td);
 	return (error);
 }
@@ -6175,26 +5982,13 @@ zfs_vptocnp(struct vop_vptocnp_args *ap)
 	zfs_exit(zfsvfs, FTAG);
 
 	covered_vp = vp->v_mount->mnt_vnodecovered;
-#if __FreeBSD_version >= 1300045
 	enum vgetstate vs = vget_prep(covered_vp);
-#else
-	vhold(covered_vp);
-#endif
 	ltype = VOP_ISLOCKED(vp);
-	VOP_UNLOCK1(vp);
-#if __FreeBSD_version >= 1300045
+	VOP_UNLOCK(vp);
 	error = vget_finish(covered_vp, LK_SHARED, vs);
-#else
-	error = vget(covered_vp, LK_SHARED | LK_VNHELD, curthread);
-#endif
 	if (error == 0) {
-#if __FreeBSD_version >= 1300123
 		error = VOP_VPTOCNP(covered_vp, ap->a_vpp, ap->a_buf,
 		    ap->a_buflen);
-#else
-		error = VOP_VPTOCNP(covered_vp, ap->a_vpp, ap->a_cred,
-		    ap->a_buf, ap->a_buflen);
-#endif
 		vput(covered_vp);
 	}
 	vn_lock(vp, ltype | LK_RETRY);
@@ -6252,7 +6046,6 @@ zfs_deallocate(struct vop_deallocate_args *ap)
 }
 #endif
 
-#if __FreeBSD_version >= 1300039
 #ifndef _SYS_SYSPROTO_H_
 struct vop_copy_file_range_args {
 	struct vnode *a_invp;
@@ -6359,7 +6152,6 @@ bad_write_fallback:
 	    ap->a_incred, ap->a_outcred, ap->a_fsizetd);
 	return (error);
 }
-#endif
 
 struct vop_vector zfs_vnodeops;
 struct vop_vector zfs_fifoops;
@@ -6368,16 +6160,10 @@ struct vop_vector zfs_shareops;
 struct vop_vector zfs_vnodeops = {
 	.vop_default =		&default_vnodeops,
 	.vop_inactive =		zfs_freebsd_inactive,
-#if __FreeBSD_version >= 1300042
 	.vop_need_inactive =	zfs_freebsd_need_inactive,
-#endif
 	.vop_reclaim =		zfs_freebsd_reclaim,
-#if __FreeBSD_version >= 1300102
 	.vop_fplookup_vexec = zfs_freebsd_fplookup_vexec,
-#endif
-#if __FreeBSD_version >= 1300139
 	.vop_fplookup_symlink = zfs_freebsd_fplookup_symlink,
-#endif
 	.vop_access =		zfs_freebsd_access,
 	.vop_allocate =		VOP_EINVAL,
 #if __FreeBSD_version >= 1400032
@@ -6416,29 +6202,21 @@ struct vop_vector zfs_vnodeops = {
 	.vop_getpages =		zfs_freebsd_getpages,
 	.vop_putpages =		zfs_freebsd_putpages,
 	.vop_vptocnp =		zfs_vptocnp,
-#if __FreeBSD_version >= 1300064
 	.vop_lock1 =		vop_lock,
 	.vop_unlock =		vop_unlock,
 	.vop_islocked =		vop_islocked,
-#endif
 #if __FreeBSD_version >= 1400043
 	.vop_add_writecount =	vop_stdadd_writecount_nomsync,
 #endif
-#if __FreeBSD_version >= 1300039
 	.vop_copy_file_range =	zfs_freebsd_copy_file_range,
-#endif
 };
 VFS_VOP_VECTOR_REGISTER(zfs_vnodeops);
 
 struct vop_vector zfs_fifoops = {
 	.vop_default =		&fifo_specops,
 	.vop_fsync =		zfs_freebsd_fsync,
-#if __FreeBSD_version >= 1300102
-	.vop_fplookup_vexec = zfs_freebsd_fplookup_vexec,
-#endif
-#if __FreeBSD_version >= 1300139
+	.vop_fplookup_vexec =	zfs_freebsd_fplookup_vexec,
 	.vop_fplookup_symlink = zfs_freebsd_fplookup_symlink,
-#endif
 	.vop_access =		zfs_freebsd_access,
 	.vop_getattr =		zfs_freebsd_getattr,
 	.vop_inactive =		zfs_freebsd_inactive,
@@ -6462,12 +6240,8 @@ VFS_VOP_VECTOR_REGISTER(zfs_fifoops);
  */
 struct vop_vector zfs_shareops = {
 	.vop_default =		&default_vnodeops,
-#if __FreeBSD_version >= 1300121
 	.vop_fplookup_vexec =	VOP_EAGAIN,
-#endif
-#if __FreeBSD_version >= 1300139
 	.vop_fplookup_symlink =	VOP_EAGAIN,
-#endif
 	.vop_access =		zfs_freebsd_access,
 	.vop_inactive =		zfs_freebsd_inactive,
 	.vop_reclaim =		zfs_freebsd_reclaim,
diff --git a/module/os/freebsd/zfs/zfs_znode.c b/module/os/freebsd/zfs/zfs_znode.c
index afbea9798c..e5c50874e1 100644
--- a/module/os/freebsd/zfs/zfs_znode.c
+++ b/module/os/freebsd/zfs/zfs_znode.c
@@ -92,7 +92,7 @@ SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD,
  * (such as VFS logic) that will not compile easily in userland.
  */
 #ifdef _KERNEL
-#if !defined(KMEM_DEBUG) && __FreeBSD_version >= 1300102
+#if !defined(KMEM_DEBUG)
 #define	_ZFS_USE_SMR
 static uma_zone_t znode_uma_zone;
 #else
@@ -434,13 +434,8 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
 	    ("%s: fast path lookup enabled without smr", __func__));
 #endif
 
-#if __FreeBSD_version >= 1300076
 	KASSERT(curthread->td_vp_reserved != NULL,
 	    ("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
-#else
-	KASSERT(curthread->td_vp_reserv > 0,
-	    ("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
-#endif
 	error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp);
 	if (error != 0) {
 		zfs_znode_free_kmem(zp);
@@ -468,9 +463,7 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
 	zp->z_sync_cnt = 0;
 	zp->z_sync_writes_cnt = 0;
 	zp->z_async_writes_cnt = 0;
-#if __FreeBSD_version >= 1300139
 	atomic_store_ptr(&zp->z_cached_symlink, NULL);
-#endif
 
 	zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
 
@@ -942,7 +935,7 @@ zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
 	int locked;
 	int err;
 
-	getnewvnode_reserve_();
+	getnewvnode_reserve();
 again:
 	*zpp = NULL;
 	ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
@@ -1055,7 +1048,7 @@ again:
 		err = insmntque(vp, zfsvfs->z_vfs);
 		if (err == 0) {
 			vp->v_hash = obj_num;
-			VOP_UNLOCK1(vp);
+			VOP_UNLOCK(vp);
 		} else {
 			zp->z_vnode = NULL;
 			zfs_znode_dmu_fini(zp);
@@ -1275,9 +1268,7 @@ void
 zfs_znode_free(znode_t *zp)
 {
 	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
-#if __FreeBSD_version >= 1300139
 	char *symlink;
-#endif
 
 	ASSERT3P(zp->z_sa_hdl, ==, NULL);
 	zp->z_vnode = NULL;
@@ -1286,14 +1277,12 @@ zfs_znode_free(znode_t *zp)
 	list_remove(&zfsvfs->z_all_znodes, zp);
 	mutex_exit(&zfsvfs->z_znodes_lock);
 
-#if __FreeBSD_version >= 1300139
 	symlink = atomic_load_ptr(&zp->z_cached_symlink);
 	if (symlink != NULL) {
 		atomic_store_rel_ptr((uintptr_t *)&zp->z_cached_symlink,
 		    (uintptr_t)NULL);
 		cache_symlink_free(symlink, strlen(symlink) + 1);
 	}
-#endif
 
 	if (zp->z_acl_cached) {
 		zfs_acl_free(zp->z_acl_cached);
diff --git a/module/os/freebsd/zfs/zvol_os.c b/module/os/freebsd/zfs/zvol_os.c
index 38e9debbe8..a53a541414 100644
--- a/module/os/freebsd/zfs/zvol_os.c
+++ b/module/os/freebsd/zfs/zvol_os.c
@@ -1312,11 +1312,7 @@ zvol_os_rename_minor(zvol_state_t *zv, const char *newname)
 		args.mda_si_drv2 = zv;
 		if (make_dev_s(&args, &dev, "%s/%s", ZVOL_DRIVER, newname)
 		    == 0) {
-#if __FreeBSD_version > 1300130
 			dev->si_iosize_max = maxphys;
-#else
-			dev->si_iosize_max = MAXPHYS;
-#endif
 			zsd->zsd_cdev = dev;
 		}
 	}
@@ -1456,11 +1452,7 @@ zvol_os_create_minor(const char *name)
 		args.mda_si_drv2 = zv;
 		if (make_dev_s(&args, &dev, "%s/%s", ZVOL_DRIVER, name)
 		    == 0) {
-#if __FreeBSD_version > 1300130
 			dev->si_iosize_max = maxphys;
-#else
-			dev->si_iosize_max = MAXPHYS;
-#endif
 			zsd->zsd_cdev = dev;
 			knlist_init_sx(&zsd->zsd_selinfo.si_note,
 			    &zv->zv_state_lock);
diff --git a/module/zfs/zfs_replay.c b/module/zfs/zfs_replay.c
index 2e0af60f6d..810550161f 100644
--- a/module/zfs/zfs_replay.c
+++ b/module/zfs/zfs_replay.c
@@ -439,7 +439,7 @@ zfs_replay_create_acl(void *arg1, void *arg2, boolean_t byteswap)
 bail:
 	if (error == 0 && zp != NULL) {
 #ifdef __FreeBSD__
-		VOP_UNLOCK1(ZTOV(zp));
+		VOP_UNLOCK(ZTOV(zp));
 #endif
 		zrele(zp);
 	}
@@ -595,7 +595,7 @@ zfs_replay_create(void *arg1, void *arg2, boolean_t byteswap)
 out:
 	if (error == 0 && zp != NULL) {
 #ifdef __FreeBSD__
-		VOP_UNLOCK1(ZTOV(zp));
+		VOP_UNLOCK(ZTOV(zp));
 #endif
 		zrele(zp);
 	}