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>
44 #ifndef HAVE_IOV_ITER_TYPE
45 #ifdef HAVE_IOV_ITER_HAS_TYPE_MEMBER
46 #define iter_is_iovec(iter) ((iter)->type & ITER_IOVEC)
47 #define iov_iter_is_kvec(iter) ((iter)->type & ITER_KVEC)
48 #define iov_iter_is_bvec(iter) ((iter)->type & ITER_BVEC)
49 #define iov_iter_is_pipe(iter) ((iter)->type & ITER_PIPE)
50 #define iov_iter_is_discard(iter) ((iter)->type & ITER_DISCARD)
52 #define iter_is_iovec(iter) 1
53 #define iov_iter_is_kvec(iter) 0
54 #define iov_iter_is_bvec(iter) 0
55 #define iov_iter_is_pipe(iter) 0
56 #define iov_iter_is_discard(iter) 0
58 #endif /* HAVE_IOV_ITER_TYPE */
60 int cfs_kernel_write(struct file *filp, const void *buf, size_t count,
62 ssize_t cfs_kernel_read(struct file *file, void *buf, size_t count,
66 * For RHEL6 struct kernel_parm_ops doesn't exist. Also
67 * the arguments for .set and .get take different
68 * parameters which is handled below
70 #ifdef HAVE_KERNEL_PARAM_OPS
71 #define cfs_kernel_param_arg_t const struct kernel_param
73 #define cfs_kernel_param_arg_t struct kernel_param_ops
74 #define kernel_param_ops kernel_param
75 #endif /* ! HAVE_KERNEL_PARAM_OPS */
77 #ifndef HAVE_KERNEL_PARAM_LOCK
78 static inline void kernel_param_unlock(struct module *mod)
80 __kernel_param_unlock();
83 static inline void kernel_param_lock(struct module *mod)
85 __kernel_param_lock();
87 #endif /* ! HAVE_KERNEL_PARAM_LOCK */
89 int cfs_apply_workqueue_attrs(struct workqueue_struct *wq,
90 const struct workqueue_attrs *attrs);
92 #ifndef HAVE_KSTRTOBOOL_FROM_USER
94 #define kstrtobool strtobool
96 int kstrtobool_from_user(const char __user *s, size_t count, bool *res);
97 #endif /* HAVE_KSTRTOBOOL_FROM_USER */
99 #ifndef HAVE_KREF_READ
100 static inline int kref_read(const struct kref *kref)
102 return atomic_read(&kref->refcount);
104 #endif /* HAVE_KREF_READ */
106 #ifdef HAVE_FORCE_SIG_WITH_TASK
107 #define cfs_force_sig(sig, task) force_sig((sig), (task))
109 #define cfs_force_sig(sig, task) \
111 unsigned long flags; \
113 spin_lock_irqsave(&task->sighand->siglock, flags); \
114 task->sighand->action[sig - 1].sa.sa_handler = SIG_DFL; \
115 send_sig(sig, task, 1); \
116 spin_unlock_irqrestore(&task->sighand->siglock, flags); \
120 void cfs_arch_init(void);
122 #ifndef container_of_safe
124 * container_of_safe - cast a member of a structure out to the containing structure
125 * @ptr: the pointer to the member.
126 * @type: the type of the container struct this is embedded in.
127 * @member: the name of the member within the struct.
129 * If IS_ERR_OR_NULL(ptr), ptr is returned unchanged.
131 * Note: Copied from Linux 5.6, with BUILD_BUG_ON_MSG section removed.
133 #define container_of_safe(ptr, type, member) ({ \
134 void *__mptr = (void *)(ptr); \
135 IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) : \
136 ((type *)(__mptr - offsetof(type, member))); })
140 * Linux v4.15-rc2-5-g4229a470175b added sizeof_field()
141 * Linux v5.5-rc4-1-g1f07dcc459d5 removed FIELD_SIZEOF()
142 * Proved a sizeof_field in terms of FIELD_SIZEOF() when one is not provided
145 #define sizeof_field(type, member) FIELD_SIZEOF(type, member)
148 #ifndef HAVE_KALLSYMS_LOOKUP_NAME
149 static inline void *kallsyms_lookup_name(char *func)
155 #endif /* __LIBCFS_LINUX_MISC_H__ */