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On older kernels, the definition for `module_param_call()` typecasts function pointers to `(void *)`, which triggers -Werror, causing the check to return false when it should return true. Fixing this breaks the build process on some older kernels because they define a `__check_old_set_param()` function in their headers that checks for a non-constified `->set()`. We workaround that through the c preprocessor by defining `__check_old_set_param(set)` to `(set)`, which prevents the build failures. However, it is now apparent that all kernels that we support have adopted the GRSecurity change, so there is no need to have an explicit autotools check for it anymore. We therefore remove the autotools check, while adding the workaround to our headers for the build time non-constified `->set()` check done by older kernel headers. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Jorgen Lundman <lundman@lundman.net> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #13984 Closes #14004
172 lines
5.2 KiB
C
172 lines
5.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (C) 2016 Gvozden Neskovic <neskovic@gmail.com>.
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* Copyright (c) 2020 by Delphix. All rights reserved.
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*/
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#ifndef _MOD_COMPAT_H
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#define _MOD_COMPAT_H
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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/*
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* Despite constifying struct kernel_param_ops, some older kernels define a
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* `__check_old_set_param()` function in their headers that checks for a
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* non-constified `->set()`. This has long been fixed in Linux mainline, but
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* since we support older kernels, we workaround it by using a preprocessor
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* definition to disable it.
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*/
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#define __check_old_set_param(_) (0)
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typedef const struct kernel_param zfs_kernel_param_t;
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#define ZMOD_RW 0644
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#define ZMOD_RD 0444
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/* BEGIN CSTYLED */
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#define INT int
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#define UINT uint
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#define ULONG ulong
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#define LONG long
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#define STRING charp
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/* END CSTYLED */
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enum scope_prefix_types {
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zfs,
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zfs_arc,
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zfs_condense,
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zfs_dbuf,
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zfs_dbuf_cache,
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zfs_deadman,
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zfs_dedup,
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zfs_l2arc,
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zfs_livelist,
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zfs_livelist_condense,
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zfs_lua,
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zfs_metaslab,
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zfs_mg,
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zfs_multihost,
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zfs_prefetch,
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zfs_reconstruct,
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zfs_recv,
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zfs_send,
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zfs_spa,
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zfs_trim,
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zfs_txg,
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zfs_vdev,
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zfs_vdev_cache,
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zfs_vdev_file,
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zfs_vdev_mirror,
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zfs_vnops,
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zfs_zevent,
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zfs_zio,
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zfs_zil
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};
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/*
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* Declare a module parameter / sysctl node
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*
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* "scope_prefix" the part of the sysctl / sysfs tree the node resides under
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* (currently a no-op on Linux)
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* "name_prefix" the part of the variable name that will be excluded from the
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* exported names on platforms with a hierarchical namespace
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* "name" the part of the variable that will be exposed on platforms with a
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* hierarchical namespace, or as name_prefix ## name on Linux
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* "type" the variable type
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* "perm" the permissions (read/write or read only)
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* "desc" a brief description of the option
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*
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* Examples:
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* ZFS_MODULE_PARAM(zfs_vdev_mirror, zfs_vdev_mirror_, rotating_inc, UINT,
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* ZMOD_RW, "Rotating media load increment for non-seeking I/O's");
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* on FreeBSD:
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* vfs.zfs.vdev.mirror.rotating_inc
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* on Linux:
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* zfs_vdev_mirror_rotating_inc
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*
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* ZFS_MODULE_PARAM(zfs, , dmu_prefetch_max, UINT, ZMOD_RW,
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* "Limit one prefetch call to this size");
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* on FreeBSD:
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* vfs.zfs.dmu_prefetch_max
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* on Linux:
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* dmu_prefetch_max
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*/
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/* BEGIN CSTYLED */
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#define ZFS_MODULE_PARAM(scope_prefix, name_prefix, name, type, perm, desc) \
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CTASSERT_GLOBAL((sizeof (scope_prefix) == sizeof (enum scope_prefix_types))); \
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module_param(name_prefix ## name, type, perm); \
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MODULE_PARM_DESC(name_prefix ## name, desc)
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/* END CSTYLED */
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/*
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* Declare a module parameter / sysctl node
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*
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* "scope_prefix" the part of the the sysctl / sysfs tree the node resides under
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* (currently a no-op on Linux)
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* "name_prefix" the part of the variable name that will be excluded from the
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* exported names on platforms with a hierarchical namespace
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* "name" the part of the variable that will be exposed on platforms with a
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* hierarchical namespace, or as name_prefix ## name on Linux
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* "setfunc" setter function
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* "getfunc" getter function
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* "perm" the permissions (read/write or read only)
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* "desc" a brief description of the option
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*
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* Examples:
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* ZFS_MODULE_PARAM_CALL(zfs_spa, spa_, slop_shift, param_set_slop_shift,
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* param_get_int, ZMOD_RW, "Reserved free space in pool");
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* on FreeBSD:
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* vfs.zfs.spa_slop_shift
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* on Linux:
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* spa_slop_shift
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*/
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/* BEGIN CSTYLED */
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#define ZFS_MODULE_PARAM_CALL(scope_prefix, name_prefix, name, setfunc, getfunc, perm, desc) \
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CTASSERT_GLOBAL((sizeof (scope_prefix) == sizeof (enum scope_prefix_types))); \
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module_param_call(name_prefix ## name, setfunc, getfunc, &name_prefix ## name, perm); \
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MODULE_PARM_DESC(name_prefix ## name, desc)
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/* END CSTYLED */
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/*
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* As above, but there is no variable with the name name_prefix ## name,
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* so NULL is passed to module_param_call instead.
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*/
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/* BEGIN CSTYLED */
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#define ZFS_MODULE_VIRTUAL_PARAM_CALL(scope_prefix, name_prefix, name, setfunc, getfunc, perm, desc) \
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CTASSERT_GLOBAL((sizeof (scope_prefix) == sizeof (enum scope_prefix_types))); \
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module_param_call(name_prefix ## name, setfunc, getfunc, NULL, perm); \
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MODULE_PARM_DESC(name_prefix ## name, desc)
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/* END CSTYLED */
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#define ZFS_MODULE_PARAM_ARGS const char *buf, zfs_kernel_param_t *kp
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#define ZFS_MODULE_DESCRIPTION(s) MODULE_DESCRIPTION(s)
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#define ZFS_MODULE_AUTHOR(s) MODULE_AUTHOR(s)
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#define ZFS_MODULE_LICENSE(s) MODULE_LICENSE(s)
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#define ZFS_MODULE_VERSION(s) MODULE_VERSION(s)
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#define module_init_early(fn) module_init(fn)
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#endif /* _MOD_COMPAT_H */
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