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