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Linux/lib/notifier-error-inject.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 #include <linux/module.h>
  3 
  4 #include "notifier-error-inject.h"
  5 
  6 static int debugfs_errno_set(void *data, u64 val)
  7 {
  8         *(int *)data = clamp_t(int, val, -MAX_ERRNO, 0);
  9         return 0;
 10 }
 11 
 12 static int debugfs_errno_get(void *data, u64 *val)
 13 {
 14         *val = *(int *)data;
 15         return 0;
 16 }
 17 
 18 DEFINE_SIMPLE_ATTRIBUTE(fops_errno, debugfs_errno_get, debugfs_errno_set,
 19                         "%lld\n");
 20 
 21 static struct dentry *debugfs_create_errno(const char *name, umode_t mode,
 22                                 struct dentry *parent, int *value)
 23 {
 24         return debugfs_create_file(name, mode, parent, value, &fops_errno);
 25 }
 26 
 27 static int notifier_err_inject_callback(struct notifier_block *nb,
 28                                 unsigned long val, void *p)
 29 {
 30         int err = 0;
 31         struct notifier_err_inject *err_inject =
 32                 container_of(nb, struct notifier_err_inject, nb);
 33         struct notifier_err_inject_action *action;
 34 
 35         for (action = err_inject->actions; action->name; action++) {
 36                 if (action->val == val) {
 37                         err = action->error;
 38                         break;
 39                 }
 40         }
 41         if (err)
 42                 pr_info("Injecting error (%d) to %s\n", err, action->name);
 43 
 44         return notifier_from_errno(err);
 45 }
 46 
 47 struct dentry *notifier_err_inject_dir;
 48 EXPORT_SYMBOL_GPL(notifier_err_inject_dir);
 49 
 50 struct dentry *notifier_err_inject_init(const char *name, struct dentry *parent,
 51                         struct notifier_err_inject *err_inject, int priority)
 52 {
 53         struct notifier_err_inject_action *action;
 54         umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
 55         struct dentry *dir;
 56         struct dentry *actions_dir;
 57 
 58         err_inject->nb.notifier_call = notifier_err_inject_callback;
 59         err_inject->nb.priority = priority;
 60 
 61         dir = debugfs_create_dir(name, parent);
 62 
 63         actions_dir = debugfs_create_dir("actions", dir);
 64 
 65         for (action = err_inject->actions; action->name; action++) {
 66                 struct dentry *action_dir;
 67 
 68                 action_dir = debugfs_create_dir(action->name, actions_dir);
 69 
 70                 /*
 71                  * Create debugfs r/w file containing action->error. If
 72                  * notifier call chain is called with action->val, it will
 73                  * fail with the error code
 74                  */
 75                 debugfs_create_errno("error", mode, action_dir, &action->error);
 76         }
 77         return dir;
 78 }
 79 EXPORT_SYMBOL_GPL(notifier_err_inject_init);
 80 
 81 static int __init err_inject_init(void)
 82 {
 83         notifier_err_inject_dir =
 84                 debugfs_create_dir("notifier-error-inject", NULL);
 85 
 86         if (!notifier_err_inject_dir)
 87                 return -ENOMEM;
 88 
 89         return 0;
 90 }
 91 
 92 static void __exit err_inject_exit(void)
 93 {
 94         debugfs_remove_recursive(notifier_err_inject_dir);
 95 }
 96 
 97 module_init(err_inject_init);
 98 module_exit(err_inject_exit);
 99 
100 MODULE_DESCRIPTION("Notifier error injection module");
101 MODULE_LICENSE("GPL");
102 MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
103 

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