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 

3 files changed, 124 insertions, 0 deletions

diff --git a/cmd/zpool/Makefile.am b/cmd/zpool/Makefile.am
index b9e221c1f..7b25726f4 100644
--- a/cmd/zpool/Makefile.am
+++ b/cmd/zpool/Makefile.am
@@ -11,6 +11,10 @@ zpool_SOURCES = \
 	zpool_util.h \
 	zpool_vdev.c
 
+if BUILD_FREEBSD
+zpool_SOURCES += os/freebsd/zpool_vdev_os.c
+endif
+
 if BUILD_LINUX
 zpool_SOURCES += os/linux/zpool_vdev_os.c
 endif
@@ -20,6 +24,9 @@ zpool_LDADD = \
 	$(top_builddir)/lib/libuutil/libuutil.la \
 	$(top_builddir)/lib/libzfs/libzfs.la
 
+if BUILD_FREEBSD
+zpool_LDADD += -L/usr/local/lib -lintl -lgeom
+endif
 zpool_LDADD += -lm $(LIBBLKID)
 
 zpoolconfdir = $(sysconfdir)/zfs/zpool.d
diff --git a/cmd/zpool/os/freebsd/zpool_vdev_os.c b/cmd/zpool/os/freebsd/zpool_vdev_os.c
new file mode 100644
index 000000000..4a8d9272d
--- /dev/null
+++ b/cmd/zpool/os/freebsd/zpool_vdev_os.c
@@ -0,0 +1,113 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2016, 2017 Intel Corporation.
+ * Copyright 2016 Igor Kozhukhov <[email protected]>.
+ */
+
+/*
+ * Functions to convert between a list of vdevs and an nvlist representing the
+ * configuration.  Each entry in the list can be one of:
+ *
+ * 	Device vdevs
+ * 		disk=(path=..., devid=...)
+ * 		file=(path=...)
+ *
+ * 	Group vdevs
+ * 		raidz[1|2]=(...)
+ * 		mirror=(...)
+ *
+ * 	Hot spares
+ *
+ * While the underlying implementation supports it, group vdevs cannot contain
+ * other group vdevs.  All userland verification of devices is contained within
+ * this file.  If successful, the nvlist returned can be passed directly to the
+ * kernel; we've done as much verification as possible in userland.
+ *
+ * Hot spares are a special case, and passed down as an array of disk vdevs, at
+ * the same level as the root of the vdev tree.
+ *
+ * The only function exported by this file is 'make_root_vdev'.  The
+ * function performs several passes:
+ *
+ * 	1. Construct the vdev specification.  Performs syntax validation and
+ *         makes sure each device is valid.
+ * 	2. Check for devices in use.  Using libdiskmgt, makes sure that no
+ *         devices are also in use.  Some can be overridden using the 'force'
+ *         flag, others cannot.
+ * 	3. Check for replication errors if the 'force' flag is not specified.
+ *         validates that the replication level is consistent across the
+ *         entire pool.
+ * 	4. Call libzfs to label any whole disks with an EFI label.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libintl.h>
+#include <libnvpair.h>
+#include <libzutil.h>
+#include <limits.h>
+#include <sys/spa.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <paths.h>
+#include <sys/stat.h>
+#include <sys/disk.h>
+#include <sys/mntent.h>
+#include <libgeom.h>
+
+#include "zpool_util.h"
+#include <sys/zfs_context.h>
+
+int
+check_device(const char *name, boolean_t force, boolean_t isspare,
+    boolean_t iswholedisk)
+{
+	char path[MAXPATHLEN];
+
+	if (strncmp(name, _PATH_DEV, sizeof (_PATH_DEV) - 1) != 0)
+		snprintf(path, sizeof (path), "%s%s", _PATH_DEV, name);
+	else
+		strlcpy(path, name, sizeof (path));
+
+	return (check_file(path, force, isspare));
+}
+
+boolean_t
+check_sector_size_database(char *path, int *sector_size)
+{
+	return (0);
+}
+
+void
+zpool_vdev_enable_file(struct stat64 *statbuf, boolean_t *wholedisk)
+{
+	if (S_ISCHR(statbuf->st_mode)) {
+		statbuf->st_mode &= ~S_IFCHR;
+		statbuf->st_mode |= S_IFBLK;
+		*wholedisk = B_FALSE;
+	}
+}
diff --git a/cmd/zpool/zpool_vdev.c b/cmd/zpool/zpool_vdev.c
index bb49211dc..a11fdd33c 100644
--- a/cmd/zpool/zpool_vdev.c
+++ b/cmd/zpool/zpool_vdev.c
@@ -941,6 +941,10 @@ make_disks(zpool_handle_t *zhp, nvlist_t *nv)
 		if (fd == -1) {
 			if (errno == EBUSY)
 				is_exclusive = 1;
+#ifdef __FreeBSD__
+			if (errno == EPERM)
+				is_exclusive = 1;
+#endif
 		} else {
 			(void) close(fd);
 		}