1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_FAULT_INJECT_H
3 #define _LINUX_FAULT_INJECT_H
5 #ifdef CONFIG_FAULT_INJECTION
7 #include <linux/types.h>
8 #include <linux/debugfs.h>
9 #include <linux/ratelimit.h>
10 #include <linux/atomic.h>
13 * For explanation of the elements of this struct, see
14 * Documentation/fault-injection/fault-injection.rst
17 unsigned long probability;
18 unsigned long interval;
21 unsigned long verbose;
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;
31 struct ratelimit_state ratelimit_state;
35 #define FAULT_ATTR_INITIALIZER { \
37 .times = ATOMIC_INIT(1), \
38 .require_end = ULONG_MAX, \
39 .stacktrace_depth = 32, \
40 .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \
46 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
47 int setup_fault_attr(struct fault_attr *attr, char *str);
48 bool should_fail(struct fault_attr *attr, ssize_t size);
50 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
52 struct dentry *fault_create_debugfs_attr(const char *name,
53 struct dentry *parent, struct fault_attr *attr);
55 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
57 static inline struct dentry *fault_create_debugfs_attr(const char *name,
58 struct dentry *parent, struct fault_attr *attr)
60 return ERR_PTR(-ENODEV);
63 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
65 #endif /* CONFIG_FAULT_INJECTION */
69 bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
71 int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
72 #ifdef CONFIG_FAILSLAB
73 extern bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags);
75 static inline bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
79 #endif /* CONFIG_FAILSLAB */
81 #endif /* _LINUX_FAULT_INJECT_H */