LXR linux/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.txt
  15 */
  16struct 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
  45int setup_fault_attr(struct fault_attr *attr, char *str);
  46bool should_fail(struct fault_attr *attr, ssize_t size);
  47
  48#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  49
  50struct 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
  55static 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
  65struct kmem_cache;
  66
  67int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
  68#ifdef CONFIG_FAILSLAB
  69extern bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags);
  70#else
  71static 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 */
  78