diff --git a/lib/libzfs/libzfs_dataset.c b/lib/libzfs/libzfs_dataset.c
index f414924ba0..638cd19261 100644
--- a/lib/libzfs/libzfs_dataset.c
+++ b/lib/libzfs/libzfs_dataset.c
@@ -3649,11 +3649,6 @@ zvol_create_link(libzfs_handle_t *hdl, const char *dataset)
 static int
 zvol_create_link_common(libzfs_handle_t *hdl, const char *dataset, int ifexists)
 {
-#if !defined(HAVE_ZVOL)
-	return (zfs_standard_error_fmt(hdl, ENOTSUP,
-		    dgettext(TEXT_DOMAIN, "cannot create device links "
-		    "for '%s'"), dataset));
-#else
 	zfs_cmd_t zc = { "\0", "\0", "\0", 0 };
 	di_devlink_handle_t dhdl;
 	priv_set_t *priv_effective;
@@ -3742,7 +3737,6 @@ zvol_create_link_common(libzfs_handle_t *hdl, const char *dataset, int ifexists)
 	}
 
 	return (0);
-#endif
 }
 
 /*
@@ -3879,9 +3873,6 @@ zfs_expand_proplist(zfs_handle_t *zhp, zprop_list_t **plp)
 int
 zfs_iscsi_perm_check(libzfs_handle_t *hdl, char *dataset, ucred_t *cred)
 {
-#if !defined(HAVE_ZVOL)
-	return (ENOTSUP);
-#else
 	zfs_cmd_t zc = { "\0", "\0", "\0", 0 };
 	nvlist_t *nvp;
 	gid_t gid;
@@ -3923,7 +3914,6 @@ zfs_iscsi_perm_check(libzfs_handle_t *hdl, char *dataset, ucred_t *cred)
 	error = ioctl(hdl->libzfs_fd, ZFS_IOC_ISCSI_PERM_CHECK, &zc);
 	nvlist_free(nvp);
 	return (error);
-#endif
 }
 
 int
diff --git a/lib/libzfs/libzfs_pool.c b/lib/libzfs/libzfs_pool.c
index 8acb0c4af8..38cc627fcb 100644
--- a/lib/libzfs/libzfs_pool.c
+++ b/lib/libzfs/libzfs_pool.c
@@ -2350,7 +2350,6 @@ int
 zpool_iter_zvol(zpool_handle_t *zhp, int (*cb)(const char *, void *),
     void *data)
 {
-#ifdef HAVE_ZVOL
 	libzfs_handle_t *hdl = zhp->zpool_hdl;
 	char (*paths)[MAXPATHLEN];
 	size_t size = 4;
@@ -2442,8 +2441,7 @@ zpool_iter_zvol(zpool_handle_t *zhp, int (*cb)(const char *, void *),
 err:
 	free(paths);
 	(void) close(base);
-#endif
-	return (0);
+	return (-1);
 }
 
 typedef struct zvol_cb {
diff --git a/module/zfs/dsl_dataset.c b/module/zfs/dsl_dataset.c
index f24b95d5c2..dd74ad5103 100644
--- a/module/zfs/dsl_dataset.c
+++ b/module/zfs/dsl_dataset.c
@@ -973,10 +973,8 @@ dsl_dataset_zvol_cleanup(dsl_dataset_t *ds, const char *name)
 	if (error)
 		return (error);
 
-#ifdef HAVE_ZVOL
 	if (dmu_objset_type(os) == DMU_OST_ZVOL)
 		error = zvol_remove_minor(name);
-#endif /* HAVE_ZVOL */
 	dmu_objset_close(os);
 
 	return (error);
diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c
index 52b63798c3..f993177667 100644
--- a/module/zfs/zfs_ioctl.c
+++ b/module/zfs/zfs_ioctl.c
@@ -1799,7 +1799,6 @@ zfs_set_prop_nvlist(const char *name, nvlist_t *nvl)
 				goto out;
 			break;
 
-#ifdef HAVE_ZVOL
 		case ZFS_PROP_VOLSIZE:
 			if ((error = nvpair_value_uint64(elem, &intval)) != 0 ||
 			    (error = zvol_set_volsize(name,
@@ -1812,11 +1811,6 @@ zfs_set_prop_nvlist(const char *name, nvlist_t *nvl)
 			    (error = zvol_set_volblocksize(name, intval)) != 0)
 				goto out;
 			break;
-#else
-		case ZFS_PROP_VOLSIZE:
-		case ZFS_PROP_VOLBLOCKSIZE:
-			return (ENOTSUP);
-#endif /* HAVE_ZVOL */
 
 		case ZFS_PROP_VERSION:
 		{
@@ -2182,11 +2176,7 @@ zfs_ioc_get_fsacl(zfs_cmd_t *zc)
 static int
 zfs_ioc_create_minor(zfs_cmd_t *zc)
 {
-#ifdef HAVE_ZVOL
 	return (zvol_create_minor(zc->zc_name, ddi_driver_major(zfs_dip)));
-#else
-	return (ENOTSUP);
-#endif /* HAVE_ZVOL */
 }
 
 /*
@@ -2198,11 +2188,7 @@ zfs_ioc_create_minor(zfs_cmd_t *zc)
 static int
 zfs_ioc_remove_minor(zfs_cmd_t *zc)
 {
-#ifdef HAVE_ZVOL
 	return (zvol_remove_minor(zc->zc_name));
-#else
-	return (ENOTSUP);
-#endif /* HAVE_ZVOL */
 }
 
 #ifdef HAVE_ZPL
@@ -2418,11 +2404,9 @@ zfs_ioc_create(zfs_cmd_t *zc)
 		cbfunc = zfs_create_cb;
 		break;
 
-#ifdef HAVE_ZVOL
 	case DMU_OST_ZVOL:
 		cbfunc = zvol_create_cb;
 		break;
-#endif /* HAVE_ZVOL */
 
 	default:
 		cbfunc = NULL;
@@ -2473,7 +2457,6 @@ zfs_ioc_create(zfs_cmd_t *zc)
 			return (EINVAL);
 		}
 
-#ifdef HAVE_ZVOL
 		if (type == DMU_OST_ZVOL) {
 			uint64_t volsize, volblocksize;
 
@@ -2503,9 +2486,7 @@ zfs_ioc_create(zfs_cmd_t *zc)
 				nvlist_free(nvprops);
 				return (error);
 			}
-		} else
-#endif /* HAVE_ZVOL */
-		if (type == DMU_OST_ZFS) {
+		} else if (type == DMU_OST_ZFS) {
 			int error;
 
 			/*
@@ -3726,10 +3707,8 @@ zfsdev_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
 	uint_t vec;
 	int error, rc;
 
-#ifdef HAVE_ZVOL
 	if (getminor(dev) != 0)
 		return (zvol_ioctl(dev, cmd, arg, flag, cr, rvalp));
-#endif
 
 	vec = cmd - ZFS_IOC;
 	ASSERT3U(getmajor(dev), ==, ddi_driver_major(zfs_dip));
@@ -3848,7 +3827,6 @@ zfs_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
  * so most of the standard driver entry points are in zvol.c.
  */
 static struct cb_ops zfs_cb_ops = {
-#ifdef HAVE_ZVOL
 	zvol_open,	/* open */
 	zvol_close,	/* close */
 	zvol_strategy,	/* strategy */
@@ -3856,15 +3834,6 @@ static struct cb_ops zfs_cb_ops = {
 	zvol_dump,	/* dump */
 	zvol_read,	/* read */
 	zvol_write,	/* write */
-#else
-	nodev,		/* open */
-	nodev,		/* close */
-	nodev,		/* strategy */
-	nodev,		/* print */
-	nodev,		/* dump */
-	nodev,		/* read */
-	nodev,		/* write */
-#endif /* HAVE_ZVOL */
 	zfsdev_ioctl,	/* ioctl */
 	nodev,		/* devmap */
 	nodev,		/* mmap */
diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
index 9b34c0ead1..cfd3b3dbdb 100644
--- a/module/zfs/zvol.c
+++ b/module/zfs/zvol.c
@@ -77,14 +77,8 @@
 #include <sys/dumphdr.h>
 #include <sys/zil_impl.h>
 
-#ifdef HAVE_SPL
-#include <linux/bitops.h>
-#include <linux/bitops_compat.h>
-#endif
-
 #include "zfs_namecheck.h"
 
-#ifdef HAVE_ZVOL
 static void *zvol_state;
 
 #define	ZVOL_DUMPSIZE		"dumpsize"
@@ -156,7 +150,6 @@ zvol_size_changed(zvol_state_t *zv, major_t maj)
 	spec_size_invalidate(dev, VBLK);
 	spec_size_invalidate(dev, VCHR);
 }
-#endif /* HAVE_ZVOL */
 
 int
 zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
@@ -167,22 +160,10 @@ zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
 	if (volsize % blocksize != 0)
 		return (EINVAL);
 
-#ifdef HAVE_SPL
-	if (volsize % 512 != 0)
-		return (EINVAL);
-
-	/*
-	 * On Linux, the maximum allowed block device size depends on the size
-	 * of sector_t.
-	 */
-	if (fls64(volsize / 512 - 1) > NBBY * sizeof (sector_t))
-		return (EOVERFLOW);
-
-#elif defined(_ILP32)
+#ifdef _ILP32
 	if (volsize - 1 > SPEC_MAXOFFSET_T)
 		return (EOVERFLOW);
 #endif
-
 	return (0);
 }
 
@@ -197,7 +178,6 @@ zvol_check_volblocksize(uint64_t volblocksize)
 	return (0);
 }
 
-#ifdef HAVE_ZVOL
 static void
 zvol_readonly_changed_cb(void *arg, uint64_t newval)
 {
@@ -208,7 +188,6 @@ zvol_readonly_changed_cb(void *arg, uint64_t newval)
 	else
 		zv->zv_flags &= ~ZVOL_RDONLY;
 }
-#endif /* HAVE_ZVOL */
 
 int
 zvol_get_stats(objset_t *os, nvlist_t *nv)
@@ -234,7 +213,6 @@ zvol_get_stats(objset_t *os, nvlist_t *nv)
 	return (error);
 }
 
-#ifdef HAVE_ZVOL
 /*
  * Find a free minor number.
  */
@@ -1607,37 +1585,27 @@ zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
 	mutex_exit(&zvol_state_lock);
 	return (error);
 }
-#endif /* HAVE_ZVOL */
 
 int
 zvol_busy(void)
 {
-#ifdef HAVE_ZVOL
 	return (zvol_minors != 0);
-#else
-	return 0;
-#endif /* HAVE_ZVOL */
 }
 
 void
 zvol_init(void)
 {
-#ifdef HAVE_ZVOL
 	VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0);
 	mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
-#endif /* HAVE_ZVOL */
 }
 
 void
 zvol_fini(void)
 {
-#ifdef HAVE_ZVOL
 	mutex_destroy(&zvol_state_lock);
 	ddi_soft_state_fini(&zvol_state);
-#endif /*  HAVE_ZVOL */
 }
 
-#ifdef HAVE_ZVOL
 static boolean_t
 zvol_is_swap(zvol_state_t *zv)
 {
@@ -1865,4 +1833,3 @@ zvol_dump_fini(zvol_state_t *zv)
 
 	return (0);
 }
-#endif /* HAVE_ZVOL */