Add FreeBSD support to OpenZFS

Add the FreeBSD platform code to the OpenZFS repository.  As of this
commit the source can be compiled and tested on FreeBSD 11 and 12.
Subsequent commits are now required to compile on FreeBSD and Linux.
Additionally, they must pass the ZFS Test Suite on FreeBSD which is
being run by the CI.  As of this commit 1230 tests pass on FreeBSD
and there are no unexpected failures.

Reviewed-by: Sean Eric Fagan <[email protected]>
Reviewed-by: Jorgen Lundman <[email protected]>
Reviewed-by: Richard Laager <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Co-authored-by: Ryan Moeller <[email protected]>
Signed-off-by: Matt Macy <[email protected]>
Signed-off-by: Ryan Moeller <[email protected]>
Closes #898 
Closes #8987 

1 files changed, 114 insertions, 0 deletions

diff --git a/module/os/freebsd/zfs/spa_stats.c b/module/os/freebsd/zfs/spa_stats.c
new file mode 100644
index 000000000..45c880ada
--- /dev/null
+++ b/module/os/freebsd/zfs/spa_stats.c
@@ -0,0 +1,114 @@
+/*
+ * 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/zfs_context.h>
+#include <sys/spa_impl.h>
+#include <sys/vdev_impl.h>
+#include <sys/spa.h>
+#include <zfs_comutil.h>
+
+void
+spa_stats_init(spa_t *spa)
+{
+
+}
+
+void
+spa_stats_destroy(spa_t *spa)
+{
+
+}
+
+void
+spa_iostats_trim_add(spa_t *spa, trim_type_t type,
+    uint64_t extents_written, uint64_t bytes_written,
+    uint64_t extents_skipped, uint64_t bytes_skipped,
+    uint64_t extents_failed, uint64_t bytes_failed)
+{
+}
+
+void
+spa_read_history_add(spa_t *spa, const zbookmark_phys_t *zb, uint32_t aflags)
+{
+}
+
+void
+spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time)
+{
+
+}
+/*
+ * Set txg state completion time and increment current state.
+ */
+int
+spa_txg_history_set(spa_t *spa, uint64_t txg, txg_state_t completed_state,
+    hrtime_t completed_time)
+{
+	return (0);
+}
+
+txg_stat_t *
+spa_txg_history_init_io(spa_t *spa, uint64_t txg, dsl_pool_t *dp)
+{
+	return (NULL);
+}
+
+void
+spa_txg_history_fini_io(spa_t *spa, txg_stat_t *ts)
+{
+
+}
+
+void
+spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs)
+{
+
+}
+
+void
+spa_mmp_history_add(spa_t *spa, uint64_t txg, uint64_t timestamp,
+    uint64_t mmp_delay, vdev_t *vd, int label, uint64_t mmp_node_id,
+    int error)
+{
+
+}
+
+int
+spa_mmp_history_set(spa_t *spa, uint64_t mmp_node_id, int io_error,
+    hrtime_t duration)
+{
+	return (0);
+}
+
+int
+spa_mmp_history_set_skip(spa_t *spa, uint64_t mmp_node_id)
+{
+	return (0);
+}