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 bool no_warn; 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 #define FAULT_ATTR_INITIALIZER { \ 36 .interval = 1, \ 37 .times = ATOMIC_INIT(1), \ 38 .require_end = ULONG_MAX, \ 39 .stacktrace_depth = 32, \ 40 .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \ 41 .verbose = 2, \ 42 .dname = NULL, \ 43 .no_warn = false, \ 44 } 45 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); 49 50 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 51 52 struct dentry *fault_create_debugfs_attr(const char *name, 53 struct dentry *parent, struct fault_attr *attr); 54 55 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 56 57 static inline struct dentry *fault_create_debugfs_attr(const char *name, 58 struct dentry *parent, struct fault_attr *attr) 59 { 60 return ERR_PTR(-ENODEV); 61 } 62 63 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 64 65 #endif /* CONFIG_FAULT_INJECTION */ 66 67 struct kmem_cache; 68 69 bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order); 70 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); 74 #else 75 static inline bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags) 76 { 77 return false; 78 } 79 #endif /* CONFIG_FAILSLAB */ 80 81 #endif /* _LINUX_FAULT_INJECT_H */ 82