4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
32 #ifndef __LIBCFS_LINUX_MISC_H__
33 #define __LIBCFS_LINUX_MISC_H__
36 /* Since Commit 2f8b544477e6 ("block,fs: untangle fs.h and blk_types.h")
37 * fs.h doesn't include blk_types.h, but we need it.
39 #include <linux/blk_types.h>
40 #include <linux/mutex.h>
41 #include <linux/user_namespace.h>
42 #include <linux/uio.h>
43 #include <linux/kallsyms.h>
45 #ifndef HAVE_IOV_ITER_TYPE
46 #ifdef HAVE_IOV_ITER_HAS_TYPE_MEMBER
47 #define iter_is_iovec(iter) ((iter)->type & ITER_IOVEC)
48 #define iov_iter_is_kvec(iter) ((iter)->type & ITER_KVEC)
49 #define iov_iter_is_bvec(iter) ((iter)->type & ITER_BVEC)
50 #define iov_iter_is_pipe(iter) ((iter)->type & ITER_PIPE)
51 #define iov_iter_is_discard(iter) ((iter)->type & ITER_DISCARD)
53 #define iter_is_iovec(iter) 1
54 #define iov_iter_is_kvec(iter) 0
55 #define iov_iter_is_bvec(iter) 0
56 #define iov_iter_is_pipe(iter) 0
57 #define iov_iter_is_discard(iter) 0
59 #endif /* HAVE_IOV_ITER_TYPE */
61 int cfs_kernel_write(struct file *filp, const void *buf, size_t count,
63 ssize_t cfs_kernel_read(struct file *file, void *buf, size_t count,
67 * For RHEL6 struct kernel_parm_ops doesn't exist. Also
68 * the arguments for .set and .get take different
69 * parameters which is handled below
71 #ifdef HAVE_KERNEL_PARAM_OPS
72 #define cfs_kernel_param_arg_t const struct kernel_param
74 #define cfs_kernel_param_arg_t struct kernel_param_ops
75 #define kernel_param_ops kernel_param
76 #endif /* ! HAVE_KERNEL_PARAM_OPS */
78 #ifndef HAVE_KERNEL_PARAM_LOCK
79 static inline void kernel_param_unlock(struct module *mod)
81 __kernel_param_unlock();
84 static inline void kernel_param_lock(struct module *mod)
86 __kernel_param_lock();
88 #endif /* ! HAVE_KERNEL_PARAM_LOCK */
90 int cfs_apply_workqueue_attrs(struct workqueue_struct *wq,
91 const struct workqueue_attrs *attrs);
93 #ifndef HAVE_KSTRTOBOOL_FROM_USER
95 #define kstrtobool strtobool
97 int kstrtobool_from_user(const char __user *s, size_t count, bool *res);
98 #endif /* HAVE_KSTRTOBOOL_FROM_USER */
100 #ifndef HAVE_KREF_READ
101 static inline int kref_read(const struct kref *kref)
103 return atomic_read(&kref->refcount);
105 #endif /* HAVE_KREF_READ */
107 #ifdef HAVE_FORCE_SIG_WITH_TASK
108 #define cfs_force_sig(sig, task) force_sig((sig), (task))
110 #define cfs_force_sig(sig, task) \
112 unsigned long flags; \
114 spin_lock_irqsave(&task->sighand->siglock, flags); \
115 task->sighand->action[sig - 1].sa.sa_handler = SIG_DFL; \
116 send_sig(sig, task, 1); \
117 spin_unlock_irqrestore(&task->sighand->siglock, flags); \
121 void cfs_arch_init(void);
123 #ifndef container_of_safe
125 * container_of_safe - cast a member of a structure out to the containing structure
126 * @ptr: the pointer to the member.
127 * @type: the type of the container struct this is embedded in.
128 * @member: the name of the member within the struct.
130 * If IS_ERR_OR_NULL(ptr), ptr is returned unchanged.
132 * Note: Copied from Linux 5.6, with BUILD_BUG_ON_MSG section removed.
134 #define container_of_safe(ptr, type, member) ({ \
135 void *__mptr = (void *)(ptr); \
136 IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) : \
137 ((type *)(__mptr - offsetof(type, member))); })
141 * Linux v4.15-rc2-5-g4229a470175b added sizeof_field()
142 * Linux v5.5-rc4-1-g1f07dcc459d5 removed FIELD_SIZEOF()
143 * Proved a sizeof_field in terms of FIELD_SIZEOF() when one is not provided
146 #define sizeof_field(type, member) FIELD_SIZEOF(type, member)
149 #ifdef HAVE_KALLSYMS_LOOKUP_NAME
150 static inline void *cfs_kallsyms_lookup_name(const char *name)
152 return (void *)kallsyms_lookup_name(name);
155 static inline void *cfs_kallsyms_lookup_name(const char *name)
161 #endif /* __LIBCFS_LINUX_MISC_H__ */