include/linux/fault-inject.h

   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 int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
  68 #ifdef CONFIG_FAILSLAB
  69 extern bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags);
  70 #else
  71 static inline bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
  72 {
  73         return false;
  74 }
  75 #endif /* CONFIG_FAILSLAB */
  76
  77 #endif /* _LINUX_FAULT_INJECT_H */