fault-inject.h

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#ifndef _LINUX_FAULT_INJECT_H
#define _LINUX_FAULT_INJECT_H

#ifdef CONFIG_FAULT_INJECTION

#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/atomic.h>

/*
 * For explanation of the elements of this struct, see
 * Documentation/fault-injection/fault-injection.txt
 */
struct fault_attr {
    unsigned long probability;
    unsigned long interval;
    atomic_t times;
    atomic_t space;
    unsigned long verbose;
    u32 task_filter;
    unsigned long stacktrace_depth;
    unsigned long require_start;
    unsigned long require_end;
    unsigned long reject_start;
    unsigned long reject_end;

    unsigned long count;
};

#define FAULT_ATTR_INITIALIZER {                \
        .interval = 1,                  \
        .times = ATOMIC_INIT(1),            \
        .require_end = ULONG_MAX,           \
        .stacktrace_depth = 32,             \
        .verbose = 2,                   \
    }

#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
int setup_fault_attr(struct fault_attr *attr, char *str);
bool should_fail(struct fault_attr *attr, ssize_t size);

#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

struct dentry *fault_create_debugfs_attr(const char *name,
            struct dentry *parent, struct fault_attr *attr);

#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */

static inline struct dentry *fault_create_debugfs_attr(const char *name,
            struct dentry *parent, struct fault_attr *attr)
{
    return ERR_PTR(-ENODEV);
}

#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */

#endif /* CONFIG_FAULT_INJECTION */

#ifdef CONFIG_FAILSLAB
extern bool should_failslab(size_t size, gfp_t gfpflags, unsigned long flags);
#else
static inline bool should_failslab(size_t size, gfp_t gfpflags,
                unsigned long flags)
{
    return false;
}
#endif /* CONFIG_FAILSLAB */

#endif /* _LINUX_FAULT_INJECT_H */