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 #define FAULT_ATTR_INITIALIZER { \ 35 .interval = 1, \ 36 .times = ATOMIC_INIT(1), \ 37 .require_end = ULONG_MAX, \ 38 .stacktrace_depth = 32, \ 39 .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \ 40 .verbose = 2, \ 41 .dname = NULL, \ 42 } 43 44 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER 45 int setup_fault_attr(struct fault_attr *attr, char *str); 46 bool should_fail(struct fault_attr *attr, ssize_t size); 47 48 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 49 50 struct dentry *fault_create_debugfs_attr(const char *name, 51 struct dentry *parent, struct fault_attr *attr); 52 53 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 54 55 static inline struct dentry *fault_create_debugfs_attr(const char *name, 56 struct dentry *parent, struct fault_attr *attr) 57 { 58 return ERR_PTR(-ENODEV); 59 } 60 61 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 62 63 #endif /* CONFIG_FAULT_INJECTION */ 64 65 struct kmem_cache; 66 67 bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order); 68 69 int should_failslab(struct kmem_cache *s, gfp_t gfpflags); 70 #ifdef CONFIG_FAILSLAB 71 extern bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags); 72 #else 73 static inline bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags) 74 { 75 return false; 76 } 77 #endif /* CONFIG_FAILSLAB */ 78 79 #endif /* _LINUX_FAULT_INJECT_H */ 80