mod.h: make consistent across all three platforms

mod.h only exists to include the platform-specific mod_os.h, so we can
get rid of it and just call the platform header mod.h.

Then, create a libspl mod.h, and move the relevant items to it so we can
start building on it.

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17537

include/os/freebsd/spl/sys/mod.h

@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SPL_MOD_H
+#define	_SPL_MOD_H
+
+#include <sys/sysctl.h>
+
+#define	ZMOD_RW CTLFLAG_RWTUN
+#define	ZMOD_RD CTLFLAG_RDTUN
+
+#define	ZFS_MODULE_PARAM(scope_prefix, name_prefix, name, type, perm, desc) \
+    SYSCTL_DECL(_vfs_ ## scope_prefix); \
+    SYSCTL_##type(_vfs_ ## scope_prefix, OID_AUTO, name, perm, \
+	&name_prefix ## name, 0, desc)
+
+#define	ZFS_MODULE_PARAM_ARGS	SYSCTL_HANDLER_ARGS
+
+#define	ZFS_MODULE_PARAM_CALL_IMPL(parent, name, perm, args, desc) \
+    SYSCTL_DECL(parent); \
+    SYSCTL_PROC(parent, OID_AUTO, name, CTLFLAG_MPSAFE | perm | args, desc)
+
+#define	ZFS_MODULE_PARAM_CALL( \
+    scope_prefix, name_prefix, name, func, _, perm, desc) \
+	ZFS_MODULE_PARAM_CALL_IMPL(_vfs_ ## scope_prefix, name, perm, \
+	    func ## _args(name_prefix ## name), desc)
+
+#define	ZFS_MODULE_VIRTUAL_PARAM_CALL ZFS_MODULE_PARAM_CALL
+
+#define	param_set_arc_u64_args(var) \
+    CTLTYPE_U64, &var, 0, param_set_arc_u64, "QU"
+
+#define	param_set_arc_int_args(var) \
+    CTLTYPE_INT, &var, 0, param_set_arc_int, "I"
+
+#define	param_set_arc_min_args(var) \
+    CTLTYPE_U64, NULL, 0, param_set_arc_min, "QU"
+
+#define	param_set_arc_max_args(var) \
+    CTLTYPE_U64, NULL, 0, param_set_arc_max, "QU"
+
+#define	param_set_arc_free_target_args(var) \
+    CTLTYPE_UINT, NULL, 0, param_set_arc_free_target, "IU"
+
+#define	param_set_arc_no_grow_shift_args(var) \
+    CTLTYPE_INT, NULL, 0, param_set_arc_no_grow_shift, "I"
+
+#define	param_set_deadman_failmode_args(var) \
+    CTLTYPE_STRING, NULL, 0, param_set_deadman_failmode, "A"
+
+#define	param_set_active_allocator_args(var) \
+    CTLTYPE_STRING, NULL, 0, param_set_active_allocator, "A"
+
+#define	param_set_deadman_synctime_args(var) \
+    CTLTYPE_U64, NULL, 0, param_set_deadman_synctime, "QU"
+
+#define	param_set_deadman_ziotime_args(var) \
+    CTLTYPE_U64, NULL, 0, param_set_deadman_ziotime, "QU"
+
+#define	param_set_multihost_interval_args(var) \
+    CTLTYPE_U64, NULL, 0, param_set_multihost_interval, "QU"
+
+#define	param_set_slop_shift_args(var) \
+    CTLTYPE_INT, NULL, 0, param_set_slop_shift, "I"
+
+#define	param_set_min_auto_ashift_args(var) \
+    CTLTYPE_UINT, NULL, 0, param_set_min_auto_ashift, "IU"
+
+#define	param_set_max_auto_ashift_args(var) \
+    CTLTYPE_UINT, NULL, 0, param_set_max_auto_ashift, "IU"
+
+#define	param_set_raidz_impl_args(var) \
+    CTLTYPE_STRING, NULL, 0, param_set_raidz_impl, "A"
+
+#define	spa_taskq_read_param_set_args(var) \
+    CTLTYPE_STRING, NULL, 0, spa_taskq_read_param, "A"
+
+#define	spa_taskq_write_param_set_args(var) \
+    CTLTYPE_STRING, NULL, 0, spa_taskq_write_param, "A"
+
+#define	fletcher_4_param_set_args(var) \
+    CTLTYPE_STRING, NULL, 0, fletcher_4_param, "A"
+
+#define	blake3_param_set_args(var) \
+    CTLTYPE_STRING, NULL, 0, blake3_param, "A"
+
+#define	sha256_param_set_args(var) \
+    CTLTYPE_STRING, NULL, 0, sha256_param, "A"
+
+#define	sha512_param_set_args(var) \
+    CTLTYPE_STRING, NULL, 0, sha512_param, "A"
+
+#include <sys/kernel.h>
+#define	module_init(fn) \
+static void \
+wrap_ ## fn(void *dummy __unused) \
+{ \
+	fn(); \
+} \
+SYSINIT(zfs_ ## fn, SI_SUB_LAST, SI_ORDER_FIRST, wrap_ ## fn, NULL)
+
+#define	module_init_early(fn) \
+static void \
+wrap_ ## fn(void *dummy __unused) \
+{ \
+	fn(); \
+} \
+SYSINIT(zfs_ ## fn, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST, wrap_ ## fn, NULL)
+
+#define	module_exit(fn) \
+static void \
+wrap_ ## fn(void *dummy __unused) \
+{ \
+	fn(); \
+} \
+SYSUNINIT(zfs_ ## fn, SI_SUB_LAST, SI_ORDER_FIRST, wrap_ ## fn, NULL)
+
+#endif /* SPL_MOD_H */