Disable debug code on userspace

Index: zfs+chaos4/lib/libzfscommon/include/sys/arc.h
===================================================================
--- zfs+chaos4.orig/lib/libzfscommon/include/sys/arc.h
+++ zfs+chaos4/lib/libzfscommon/include/sys/arc.h
@@ -82,7 +82,7 @@ int arc_released(arc_buf_t *buf);
 int arc_has_callback(arc_buf_t *buf);
 void arc_buf_freeze(arc_buf_t *buf);
 void arc_buf_thaw(arc_buf_t *buf);
-#ifdef ZFS_DEBUG
+#if defined(ZFS_DEBUG) || (!defined(_KERNEL) && !defined(NDEBUG))
 int arc_referenced(arc_buf_t *buf);
 #endif
 
Index: zfs+chaos4/lib/libzfscommon/include/sys/refcount.h
===================================================================
--- zfs+chaos4.orig/lib/libzfscommon/include/sys/refcount.h
+++ zfs+chaos4/lib/libzfscommon/include/sys/refcount.h
@@ -43,7 +43,7 @@ extern "C" {
  */
 #define	FTAG ((char *)__func__)
 
-#if defined(DEBUG) || !defined(_KERNEL)
+#if defined(DEBUG)
 typedef struct reference {
 	list_node_t ref_link;
 	void *ref_holder;
Index: zfs+chaos4/lib/libzfscommon/include/sys/zfs_context_user.h
===================================================================
--- zfs+chaos4.orig/lib/libzfscommon/include/sys/zfs_context_user.h
+++ zfs+chaos4/lib/libzfscommon/include/sys/zfs_context_user.h
@@ -96,6 +96,8 @@ extern "C" {
 
 #ifdef ZFS_DEBUG
 extern void dprintf_setup(int *argc, char **argv);
+#else
+#define dprintf_setup(ac,av) ((void) 0)
 #endif /* ZFS_DEBUG */
 
 extern void cmn_err(int, const char *, ...);
@@ -105,21 +107,26 @@ extern void vpanic(const char *, __va_li
 
 #define	fm_panic	panic
 
+#ifndef zp_verify
 /* This definition is copied from assert.h. */
 #if defined(__STDC__)
 #if __STDC_VERSION__ - 0 >= 199901L
-#define	verify(EX) (void)((EX) || \
+#define	zp_verify(EX) (void)((EX) || \
 	(__assert_c99(#EX, __FILE__, __LINE__, __func__), 0))
 #else
-#define	verify(EX) (void)((EX) || (__assert(#EX, __FILE__, __LINE__), 0))
+#define	zp_verify(EX) (void)((EX) || (__assert(#EX, __FILE__, __LINE__), 0))
 #endif /* __STDC_VERSION__ - 0 >= 199901L */
 #else
-#define	verify(EX) (void)((EX) || (_assert("EX", __FILE__, __LINE__), 0))
+#define	zp_verify(EX) (void)((EX) || (_assert("EX", __FILE__, __LINE__), 0))
 #endif	/* __STDC__ */
+#endif
 
-
-#define	VERIFY	verify
+#ifndef VERIFY
+#define	VERIFY	zp_verify
+#endif
+#ifndef ASSERT
 #define	ASSERT	assert
+#endif
 
 extern void __assert(const char *, const char *, int);
 
@@ -332,6 +339,7 @@ extern int	taskq_member(taskq_t *, void 
 typedef struct vnode {
 	uint64_t	v_size;
 	int		v_fd;
+	mode_t		v_mode;
 	char		*v_path;
 } vnode_t;
 
Index: zfs+chaos4/lib/libzfscommon/include/sys/zfs_debug.h
===================================================================
--- zfs+chaos4.orig/lib/libzfscommon/include/sys/zfs_debug.h
+++ zfs+chaos4/lib/libzfscommon/include/sys/zfs_debug.h
@@ -44,7 +44,7 @@ extern "C" {
  * ZFS debugging
  */
 
-#if defined(DEBUG) || !defined(_KERNEL)
+#if defined(DEBUG)
 #define	ZFS_DEBUG
 #endif
 
Index: zfs+chaos4/lib/libzpool/arc.c
===================================================================
--- zfs+chaos4.orig/lib/libzpool/arc.c
+++ zfs+chaos4/lib/libzpool/arc.c
@@ -1802,7 +1802,7 @@ arc_reclaim_needed(void)
 		return (1);
 #endif
 
-#else
+#elif defined(ZFS_DEBUG)
 	if (spa_get_random(100) == 0)
 		return (1);
 #endif
@@ -2881,7 +2881,7 @@ arc_has_callback(arc_buf_t *buf)
 	return (buf->b_efunc != NULL);
 }
 
-#ifdef ZFS_DEBUG
+#if defined(ZFS_DEBUG) || (!defined(_KERNEL) && !defined(NDEBUG))
 int
 arc_referenced(arc_buf_t *buf)
 {
Index: zfs+chaos4/lib/libzpool/kernel.c
===================================================================
--- zfs+chaos4.orig/lib/libzpool/kernel.c
+++ zfs+chaos4/lib/libzpool/kernel.c
@@ -384,6 +384,7 @@ vn_open(char *path, int x1, int flags, i
 
 	vp->v_fd = fd;
 	vp->v_size = st.st_size;
+	vp->v_mode = st.st_mode;
 	vp->v_path = spa_strdup(path);
 
 	return (0);
@@ -422,10 +423,17 @@ vn_rdwr(int uio, vnode_t *vp, void *addr
 		 * To simulate partial disk writes, we split writes into two
 		 * system calls so that the process can be killed in between.
 		 */
-		split = (len > 0 ? rand() % len : 0);
-		iolen = pwrite64(vp->v_fd, addr, split, offset);
-		iolen += pwrite64(vp->v_fd, (char *)addr + split,
-		    len - split, offset + split);
+#ifdef ZFS_DEBUG
+		if (!S_ISBLK(vp->v_mode) && !S_ISCHR(vp->v_mode)) {
+			split = (len > 0 ? rand() % len : 0);
+			iolen = pwrite64(vp->v_fd, addr, split, offset);
+			iolen += pwrite64(vp->v_fd, (char *)addr + split,
+			    len - split, offset + split);
+		} else
+			iolen = pwrite64(vp->v_fd, addr, len, offset);
+#else
+		iolen = pwrite64(vp->v_fd, addr, len, offset);
+#endif
 	}
 
 	if (iolen < 0)
Index: zfs+chaos4/lib/libzpool/refcount.c
===================================================================
--- zfs+chaos4.orig/lib/libzpool/refcount.c
+++ zfs+chaos4/lib/libzpool/refcount.c
@@ -28,7 +28,7 @@
 #include <sys/zfs_context.h>
 #include <sys/refcount.h>
 
-#if defined(DEBUG) || !defined(_KERNEL)
+#if defined(DEBUG)
 
 #ifdef _KERNEL
 int reference_tracking_enable = FALSE; /* runs out of memory too easily */
Index: zfs+chaos4/lib/libzpool/spa_misc.c
===================================================================
--- zfs+chaos4.orig/lib/libzpool/spa_misc.c
+++ zfs+chaos4/lib/libzpool/spa_misc.c
@@ -178,11 +178,15 @@ kmem_cache_t *spa_buffer_pool;
 int spa_mode;
 
 #ifdef ZFS_DEBUG
+#ifdef _KERNEL
 /* Everything except dprintf is on by default in debug builds */
 int zfs_flags = ~ZFS_DEBUG_DPRINTF;
 #else
+int zfs_flags = ~0;
+#endif /* _KERNEL */
+#else
 int zfs_flags = 0;
-#endif
+#endif /* ZFS_DEBUG */
 
 /*
  * zfs_recover can be set to nonzero to attempt to recover from