notifier-error-inject.c

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    1 #include <linux/module.h>
    2 
    3 #include "notifier-error-inject.h"
    4 
    5 static int debugfs_errno_set(void *data, u64 val)
    6 {
    7         *(int *)data = clamp_t(int, val, -MAX_ERRNO, 0);
    8         return 0;
    9 }
   10 
   11 static int debugfs_errno_get(void *data, u64 *val)
   12 {
   13         *val = *(int *)data;
   14         return 0;
   15 }
   16 
   17 DEFINE_SIMPLE_ATTRIBUTE(fops_errno, debugfs_errno_get, debugfs_errno_set,
   18                         "%lld\n");
   19 
   20 static struct dentry *debugfs_create_errno(const char *name, mode_t mode,
   21                                 struct dentry *parent, int *value)
   22 {
   23         return debugfs_create_file(name, mode, parent, value, &fops_errno);
   24 }
   25 
   26 static int notifier_err_inject_callback(struct notifier_block *nb,
   27                                 unsigned long val, void *p)
   28 {
   29         int err = 0;
   30         struct notifier_err_inject *err_inject =
   31                 container_of(nb, struct notifier_err_inject, nb);
   32         struct notifier_err_inject_action *action;
   33 
   34         for (action = err_inject->actions; action->name; action++) {
   35                 if (action->val == val) {
   36                         err = action->error;
   37                         break;
   38                 }
   39         }
   40         if (err)
   41                 pr_info("Injecting error (%d) to %s\n", err, action->name);
   42 
   43         return notifier_from_errno(err);
   44 }
   45 
   46 struct dentry *notifier_err_inject_dir;
   47 EXPORT_SYMBOL_GPL(notifier_err_inject_dir);
   48 
   49 struct dentry *notifier_err_inject_init(const char *name, struct dentry *parent,
   50                         struct notifier_err_inject *err_inject, int priority)
   51 {
   52         struct notifier_err_inject_action *action;
   53         mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
   54         struct dentry *dir;
   55         struct dentry *actions_dir;
   56 
   57         err_inject->nb.notifier_call = notifier_err_inject_callback;
   58         err_inject->nb.priority = priority;
   59 
   60         dir = debugfs_create_dir(name, parent);
   61         if (!dir)
   62                 return ERR_PTR(-ENOMEM);
   63 
   64         actions_dir = debugfs_create_dir("actions", dir);
   65         if (!actions_dir)
   66                 goto fail;
   67 
   68         for (action = err_inject->actions; action->name; action++) {
   69                 struct dentry *action_dir;
   70 
   71                 action_dir = debugfs_create_dir(action->name, actions_dir);
   72                 if (!action_dir)
   73                         goto fail;
   74 
   75                 /*
   76                  * Create debugfs r/w file containing action->error. If
   77                  * notifier call chain is called with action->val, it will
   78                  * fail with the error code
   79                  */
   80                 if (!debugfs_create_errno("error", mode, action_dir,
   81                                         &action->error))
   82                         goto fail;
   83         }
   84         return dir;
   85 fail:
   86         debugfs_remove_recursive(dir);
   87         return ERR_PTR(-ENOMEM);
   88 }
   89 EXPORT_SYMBOL_GPL(notifier_err_inject_init);
   90 
   91 static int __init err_inject_init(void)
   92 {
   93         notifier_err_inject_dir =
   94                 debugfs_create_dir("notifier-error-inject", NULL);
   95 
   96         if (!notifier_err_inject_dir)
   97                 return -ENOMEM;
   98 
   99         return 0;
  100 }
  101 
  102 static void __exit err_inject_exit(void)
  103 {
  104         debugfs_remove_recursive(notifier_err_inject_dir);
  105 }
  106 
  107 module_init(err_inject_init);
  108 module_exit(err_inject_exit);
  109 
  110 MODULE_DESCRIPTION("Notifier error injection module");
  111 MODULE_LICENSE("GPL");
  112 MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");

Cache object: 8ee8dc044e37e0df57e3170e49b7ceb0

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FreeBSD/Linux Kernel Cross Reference sys/lib/notifier-error-inject.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/notifier-error-inject.c