+ /*
+ * To enable this:
+ *
+ * $ echo 512 >/sys/module/zfs/parameters/zfs_flags
+ */
+ if (zfs_flags & ZFS_DEBUG_SET_ERROR)
+ __dprintf(file, func, line, "error %lu", err);
+}
+
+#ifdef _KERNEL
+static void
+__zfs_dbgmsg(char *buf)
+{
+ int size = sizeof (zfs_dbgmsg_t) + strlen(buf);
+ zfs_dbgmsg_t *zdm = kmem_zalloc(size, KM_SLEEP);
+ zdm->zdm_size = size;
+ zdm->zdm_timestamp = gethrestime_sec();
+ strcpy(zdm->zdm_msg, buf);
+
+ mutex_enter(&zfs_dbgmsgs.pl_lock);
+ procfs_list_add(&zfs_dbgmsgs, zdm);
+ zfs_dbgmsg_size += size;
+ zfs_dbgmsg_purge(MAX(zfs_dbgmsg_maxsize, 0));
+ mutex_exit(&zfs_dbgmsgs.pl_lock);
+}
+
+void
+__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
+{
+ const char *newfile;