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/
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33 #ifndef __LIBCFS_LINUX_MISC_H__
34 #define __LIBCFS_LINUX_MISC_H__
37 /* Since Commit 2f8b544477e6 ("block,fs: untangle fs.h and blk_types.h")
38 * fs.h doesn't include blk_types.h, but we need it.
40 #include <linux/blk_types.h>
41 #include <linux/mutex.h>
42 #include <linux/user_namespace.h>
43 #include <linux/uio.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_get_environ(const char *key, char *value, int *val_len);
63 int cfs_kernel_write(struct file *filp, const void *buf, size_t count,
65 ssize_t cfs_kernel_read(struct file *file, void *buf, size_t count,
69 * For RHEL6 struct kernel_parm_ops doesn't exist. Also
70 * the arguments for .set and .get take different
71 * parameters which is handled below
73 #ifdef HAVE_KERNEL_PARAM_OPS
74 #define cfs_kernel_param_arg_t const struct kernel_param
76 #define cfs_kernel_param_arg_t struct kernel_param_ops
77 #define kernel_param_ops kernel_param
78 #endif /* ! HAVE_KERNEL_PARAM_OPS */
80 #ifndef HAVE_KERNEL_PARAM_LOCK
81 static inline void kernel_param_unlock(struct module *mod)
83 __kernel_param_unlock();
86 static inline void kernel_param_lock(struct module *mod)
88 __kernel_param_lock();
90 #endif /* ! HAVE_KERNEL_PARAM_LOCK */
92 int cfs_apply_workqueue_attrs(struct workqueue_struct *wq,
93 const struct workqueue_attrs *attrs);
95 #ifndef HAVE_KSTRTOBOOL_FROM_USER
97 #define kstrtobool strtobool
99 int kstrtobool_from_user(const char __user *s, size_t count, bool *res);
100 #endif /* HAVE_KSTRTOBOOL_FROM_USER */
102 #ifndef HAVE_KREF_READ
103 static inline int kref_read(const struct kref *kref)
105 return atomic_read(&kref->refcount);
107 #endif /* HAVE_KREF_READ */
109 void cfs_arch_init(void);
111 #ifndef container_of_safe
113 * container_of_safe - cast a member of a structure out to the containing structure
114 * @ptr: the pointer to the member.
115 * @type: the type of the container struct this is embedded in.
116 * @member: the name of the member within the struct.
118 * If IS_ERR_OR_NULL(ptr), ptr is returned unchanged.
120 * Note: Copied from Linux 5.6, with BUILD_BUG_ON_MSG section removed.
122 #define container_of_safe(ptr, type, member) ({ \
123 void *__mptr = (void *)(ptr); \
124 IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) : \
125 ((type *)(__mptr - offsetof(type, member))); })
128 #endif /* __LIBCFS_LINUX_MISC_H__ */