09c434b8a0047 (Thomas Gleixner 2019-05-19 13:08:20 +0100 1) // SPDX-License-Identifier: GPL-2.0-only
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 2) #include <linux/module.h>
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 3)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 4) #include "notifier-error-inject.h"
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 5)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 6) static int debugfs_errno_set(void *data, u64 val)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 7) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 8) *(int *)data = clamp_t(int, val, -MAX_ERRNO, 0);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 9) return 0;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 10) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 11)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 12) static int debugfs_errno_get(void *data, u64 *val)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 13) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 14) *val = *(int *)data;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 15) return 0;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 16) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 17)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 18) DEFINE_SIMPLE_ATTRIBUTE(fops_errno, debugfs_errno_get, debugfs_errno_set,
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 19) "%lld\n");
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 20)
0ecc833bac594 (Al Viro 2013-03-29 12:23:28 -0400 21) static struct dentry *debugfs_create_errno(const char *name, umode_t mode,
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 22) struct dentry *parent, int *value)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 23) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 24) return debugfs_create_file(name, mode, parent, value, &fops_errno);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 25) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 26)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 27) static int notifier_err_inject_callback(struct notifier_block *nb,
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 28) unsigned long val, void *p)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 29) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 30) int err = 0;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 31) struct notifier_err_inject *err_inject =
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 32) container_of(nb, struct notifier_err_inject, nb);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 33) struct notifier_err_inject_action *action;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 34)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 35) for (action = err_inject->actions; action->name; action++) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 36) if (action->val == val) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 37) err = action->error;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 38) break;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 39) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 40) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 41) if (err)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 42) pr_info("Injecting error (%d) to %s\n", err, action->name);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 43)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 44) return notifier_from_errno(err);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 45) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 46)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 47) struct dentry *notifier_err_inject_dir;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 48) EXPORT_SYMBOL_GPL(notifier_err_inject_dir);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 49)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 50) struct dentry *notifier_err_inject_init(const char *name, struct dentry *parent,
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 51) struct notifier_err_inject *err_inject, int priority)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 52) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 53) struct notifier_err_inject_action *action;
0ecc833bac594 (Al Viro 2013-03-29 12:23:28 -0400 54) umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 55) struct dentry *dir;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 56) struct dentry *actions_dir;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 57)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 58) err_inject->nb.notifier_call = notifier_err_inject_callback;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 59) err_inject->nb.priority = priority;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 60)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 61) dir = debugfs_create_dir(name, parent);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 62)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 63) actions_dir = debugfs_create_dir("actions", dir);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 64)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 65) for (action = err_inject->actions; action->name; action++) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 66) struct dentry *action_dir;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 67)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 68) action_dir = debugfs_create_dir(action->name, actions_dir);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 69)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 70) /*
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 71) * Create debugfs r/w file containing action->error. If
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 72) * notifier call chain is called with action->val, it will
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 73) * fail with the error code
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 74) */
56f3364aba886 (Greg Kroah-Hartman 2019-06-12 17:36:13 +0200 75) debugfs_create_errno("error", mode, action_dir, &action->error);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 76) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 77) return dir;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 78) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 79) EXPORT_SYMBOL_GPL(notifier_err_inject_init);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 80)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 81) static int __init err_inject_init(void)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 82) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 83) notifier_err_inject_dir =
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 84) debugfs_create_dir("notifier-error-inject", NULL);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 85)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 86) if (!notifier_err_inject_dir)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 87) return -ENOMEM;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 88)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 89) return 0;
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 90) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 91)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 92) static void __exit err_inject_exit(void)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 93) {
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 94) debugfs_remove_recursive(notifier_err_inject_dir);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 95) }
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 96)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 97) module_init(err_inject_init);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 98) module_exit(err_inject_exit);
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 99)
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 100) MODULE_DESCRIPTION("Notifier error injection module");
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 101) MODULE_LICENSE("GPL");
8d438288145f1 (Akinobu Mita 2012-07-30 14:43:02 -0700 102) MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
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