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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_FAULT_INJECT_H
3#define _LINUX_FAULT_INJECT_H
4
5#include <linux/err.h>
6#include <linux/types.h>
7
8struct dentry;
9struct kmem_cache;
10
11#ifdef CONFIG_FAULT_INJECTION
12
13#include <linux/atomic.h>
14#include <linux/configfs.h>
15#include <linux/ratelimit.h>
16
17/*
18 * For explanation of the elements of this struct, see
19 * Documentation/fault-injection/fault-injection.rst
20 */
21struct fault_attr {
22 unsigned long probability;
23 unsigned long interval;
24 atomic_t times;
25 atomic_t space;
26 unsigned long verbose;
27 bool task_filter;
28 unsigned long stacktrace_depth;
29 unsigned long require_start;
30 unsigned long require_end;
31 unsigned long reject_start;
32 unsigned long reject_end;
33
34 unsigned long count;
35 struct ratelimit_state ratelimit_state;
36 struct dentry *dname;
37};
38
39enum fault_flags {
40 FAULT_NOWARN = 1 << 0,
41};
42
43#define FAULT_ATTR_INITIALIZER { \
44 .interval = 1, \
45 .times = ATOMIC_INIT(1), \
46 .require_end = ULONG_MAX, \
47 .stacktrace_depth = 32, \
48 .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \
49 .verbose = 2, \
50 .dname = NULL, \
51 }
52
53#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
54int setup_fault_attr(struct fault_attr *attr, char *str);
55bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags);
56bool should_fail(struct fault_attr *attr, ssize_t size);
57
58#else /* CONFIG_FAULT_INJECTION */
59
60struct fault_attr {
61};
62
63#define DECLARE_FAULT_ATTR(name) struct fault_attr name = {}
64
65static inline int setup_fault_attr(struct fault_attr *attr, char *str)
66{
67 return 0; /* Note: 0 means error for __setup() handlers! */
68}
69static inline bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags)
70{
71 return false;
72}
73static inline bool should_fail(struct fault_attr *attr, ssize_t size)
74{
75 return false;
76}
77
78#endif /* CONFIG_FAULT_INJECTION */
79
80#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
81
82struct dentry *fault_create_debugfs_attr(const char *name,
83 struct dentry *parent, struct fault_attr *attr);
84
85#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
86
87static inline struct dentry *fault_create_debugfs_attr(const char *name,
88 struct dentry *parent, struct fault_attr *attr)
89{
90 return ERR_PTR(-ENODEV);
91}
92
93#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
94
95#ifdef CONFIG_FAULT_INJECTION_CONFIGFS
96
97struct fault_config {
98 struct fault_attr attr;
99 struct config_group group;
100};
101
102void fault_config_init(struct fault_config *config, const char *name);
103
104#else /* CONFIG_FAULT_INJECTION_CONFIGFS */
105
106struct fault_config {
107};
108
109static inline void fault_config_init(struct fault_config *config,
110 const char *name)
111{
112}
113
114#endif /* CONFIG_FAULT_INJECTION_CONFIGFS */
115
116#ifdef CONFIG_FAIL_PAGE_ALLOC
117bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
118#else
119static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
120{
121 return false;
122}
123#endif /* CONFIG_FAIL_PAGE_ALLOC */
124
125#ifdef CONFIG_FAILSLAB
126int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
127#else
128static inline int should_failslab(struct kmem_cache *s, gfp_t gfpflags)
129{
130 return false;
131}
132#endif /* CONFIG_FAILSLAB */
133
134#endif /* _LINUX_FAULT_INJECT_H */