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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100// SPDX-License-Identifier: GPL-2.0-only#include <linux/module.h>
#include "notifier-error-inject.h"
static int debugfs_errno_set(void *data, u64 val){ *(int *)data = clamp_t(int, val, -MAX_ERRNO, 0); return 0;}
static int debugfs_errno_get(void *data, u64 *val){ *val = *(int *)data; return 0;}
DEFINE_SIMPLE_ATTRIBUTE_SIGNED(fops_errno, debugfs_errno_get, debugfs_errno_set, "%lld\n");
static struct dentry *debugfs_create_errno(const char *name, umode_t mode, struct dentry *parent, int *value){ return debugfs_create_file(name, mode, parent, value, &fops_errno);}
static int notifier_err_inject_callback(struct notifier_block *nb, unsigned long val, void *p){ int err = 0; struct notifier_err_inject *err_inject = container_of(nb, struct notifier_err_inject, nb); struct notifier_err_inject_action *action;
for (action = err_inject->actions; action->name; action++) { if (action->val == val) { err = action->error; break; } } if (err) pr_info("Injecting error (%d) to %s\n", err, action->name);
return notifier_from_errno(err);}
struct dentry *notifier_err_inject_dir;EXPORT_SYMBOL_GPL(notifier_err_inject_dir);
struct dentry *notifier_err_inject_init(const char *name, struct dentry *parent, struct notifier_err_inject *err_inject, int priority){ struct notifier_err_inject_action *action; umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; struct dentry *dir; struct dentry *actions_dir;
err_inject->nb.notifier_call = notifier_err_inject_callback; err_inject->nb.priority = priority;
dir = debugfs_create_dir(name, parent);
actions_dir = debugfs_create_dir("actions", dir);
for (action = err_inject->actions; action->name; action++) { struct dentry *action_dir;
action_dir = debugfs_create_dir(action->name, actions_dir);
/* * Create debugfs r/w file containing action->error. If * notifier call chain is called with action->val, it will * fail with the error code */ debugfs_create_errno("error", mode, action_dir, &action->error); } return dir;}EXPORT_SYMBOL_GPL(notifier_err_inject_init);
static int __init err_inject_init(void){ notifier_err_inject_dir = debugfs_create_dir("notifier-error-inject", NULL);
return 0;}
static void __exit err_inject_exit(void){ debugfs_remove_recursive(notifier_err_inject_dir);}
module_init(err_inject_init);module_exit(err_inject_exit);
MODULE_DESCRIPTION("Notifier error injection module");MODULE_LICENSE("GPL");MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");