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libspl: implement ZFS_MODULE_PARAM for userspace

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For each tunable declaration, we create a zfs_tunable_t with its
details, and then a pointer to it in the 'zfs_tunables' ELF section,
that we can access later with a little support from the linker.

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
This commit is contained in:
Rob Norris
2025-07-12 11:31:17 +10:00
committed by Brian Behlendorf
parent 3a494c6d2a
commit 967ce75669
5 changed files with 144 additions and 1 deletions
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lib/libspl/include/sys/mod.h
+18 -1
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@@ -24,12 +24,29 @@
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
* Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
*/
#ifndef _SYS_MOD_H
#define _SYS_MOD_H
#define ZFS_MODULE_PARAM(scope, prefix, name, type, perm, desc)
#include <sys/tunables.h>
#define ZFS_MODULE_PARAM(scope, prefix, name, type, perm, desc) \
static const zfs_tunable_t _zfs_tunable_##prefix##name = { \
.zt_name = #prefix#name, \
.zt_varp = &prefix##name, \
.zt_varsz = sizeof (prefix##name), \
.zt_type = ZFS_TUNABLE_TYPE_##type, \
.zt_perm = ZFS_TUNABLE_PERM_##perm, \
.zt_desc = desc \
}; \
static const zfs_tunable_t * \
__zfs_tunable_##prefix##name \
__attribute__((__section__("zfs_tunables"))) \
__attribute__((__used__)) \
= &_zfs_tunable_##prefix##name;
#define ZFS_MODULE_PARAM_ARGS void
#define ZFS_MODULE_PARAM_CALL(scope_prefix, name_prefix, name, setfunc, \
getfunc, perm, desc)