cregit-Linux how code gets into the kernel

Release 4.16 lib/notifier-error-inject.c

Directory: lib
#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; }

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static int debugfs_errno_get(void *data, u64 *val) { *val = *(int *)data; return 0; }

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DEFINE_SIMPLE_ATTRIBUTE(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); }

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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); }

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Akinobu Mita99100.00%1100.00%
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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); if (!dir) return ERR_PTR(-ENOMEM); actions_dir = debugfs_create_dir("actions", dir); if (!actions_dir) goto fail; for (action = err_inject->actions; action->name; action++) { struct dentry *action_dir; action_dir = debugfs_create_dir(action->name, actions_dir); if (!action_dir) goto fail; /* * Create debugfs r/w file containing action->error. If * notifier call chain is called with action->val, it will * fail with the error code */ if (!debugfs_create_errno("error", mode, action_dir, &action->error)) goto fail; } return dir; fail: debugfs_remove_recursive(dir); return ERR_PTR(-ENOMEM); }

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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); if (!notifier_err_inject_dir) return -ENOMEM; return 0; }

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static void __exit err_inject_exit(void) { debugfs_remove_recursive(notifier_err_inject_dir); }

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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>");

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Akinobu Mita48299.59%150.00%
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Total484100.00%2100.00%
Directory: lib
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