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/ratelimit.h> 10 #include <linux/atomic.h> 11 12 /* 13 * For explanation of the elements of this struct, see 14 * Documentation/fault-injection/fault-injection.rst 15 */ 16 struct fault_attr { 17 unsigned long probability; 18 unsigned long interval; 19 atomic_t times; 20 atomic_t space; 21 unsigned long verbose; 22 bool task_filter; 23 unsigned long stacktrace_depth; 24 unsigned long require_start; 25 unsigned long require_end; 26 unsigned long reject_start; 27 unsigned long reject_end; 28 29 unsigned long count; 30 struct ratelimit_state ratelimit_state; 31 struct dentry *dname; 32 }; 33 34 enum fault_flags { 35 FAULT_NOWARN = 1 << 0, 36 }; 37 38 #define FAULT_ATTR_INITIALIZER { \ 39 .interval = 1, \ 40 .times = ATOMIC_INIT(1), \ 41 .require_end = ULONG_MAX, \ 42 .stacktrace_depth = 32, \ 43 .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \ 44 .verbose = 2, \ 45 .dname = NULL, \ 46 } 47 48 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER 49 int setup_fault_attr(struct fault_attr *attr, char *str); 50 bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags); 51 bool should_fail(struct fault_attr *attr, ssize_t size); 52 53 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 54 55 struct dentry *fault_create_debugfs_attr(const char *name, 56 struct dentry *parent, struct fault_attr *attr); 57 58 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 59 60 static inline struct dentry *fault_create_debugfs_attr(const char *name, 61 struct dentry *parent, struct fault_attr *attr) 62 { 63 return ERR_PTR(-ENODEV); 64 } 65 66 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 67 68 #endif /* CONFIG_FAULT_INJECTION */ 69 70 struct kmem_cache; 71 72 bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order); 73 74 int should_failslab(struct kmem_cache *s, gfp_t gfpflags); 75 #ifdef CONFIG_FAILSLAB 76 extern bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags); 77 #else 78 static inline bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags) 79 { 80 return false; 81 } 82 #endif /* CONFIG_FAILSLAB */ 83 84 #endif /* _LINUX_FAULT_INJECT_H */ 85