1*1a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 251e5b2bdSMike Anderson /* 351e5b2bdSMike Anderson * Device Mapper Uevent Support (dm-uevent) 451e5b2bdSMike Anderson * 551e5b2bdSMike Anderson * Copyright IBM Corporation, 2007 651e5b2bdSMike Anderson * Author: Mike Anderson <andmike@linux.vnet.ibm.com> 751e5b2bdSMike Anderson */ 851e5b2bdSMike Anderson #include <linux/list.h> 951e5b2bdSMike Anderson #include <linux/slab.h> 1051e5b2bdSMike Anderson #include <linux/kobject.h> 117a8c3d3bSMike Anderson #include <linux/dm-ioctl.h> 12daaa5f7cSPaul Gortmaker #include <linux/export.h> 1351e5b2bdSMike Anderson 1451e5b2bdSMike Anderson #include "dm.h" 1551e5b2bdSMike Anderson #include "dm-uevent.h" 1651e5b2bdSMike Anderson 1751e5b2bdSMike Anderson #define DM_MSG_PREFIX "uevent" 1851e5b2bdSMike Anderson 197a8c3d3bSMike Anderson static const struct { 207a8c3d3bSMike Anderson enum dm_uevent_type type; 217a8c3d3bSMike Anderson enum kobject_action action; 227a8c3d3bSMike Anderson char *name; 237a8c3d3bSMike Anderson } _dm_uevent_type_names[] = { 247a8c3d3bSMike Anderson {DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"}, 257a8c3d3bSMike Anderson {DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"}, 267a8c3d3bSMike Anderson }; 277a8c3d3bSMike Anderson 2851e5b2bdSMike Anderson static struct kmem_cache *_dm_event_cache; 2951e5b2bdSMike Anderson 3051e5b2bdSMike Anderson struct dm_uevent { 3151e5b2bdSMike Anderson struct mapped_device *md; 3251e5b2bdSMike Anderson enum kobject_action action; 3351e5b2bdSMike Anderson struct kobj_uevent_env ku_env; 3451e5b2bdSMike Anderson struct list_head elist; 357a8c3d3bSMike Anderson char name[DM_NAME_LEN]; 367a8c3d3bSMike Anderson char uuid[DM_UUID_LEN]; 3751e5b2bdSMike Anderson }; 3851e5b2bdSMike Anderson 3951e5b2bdSMike Anderson static void dm_uevent_free(struct dm_uevent *event) 4051e5b2bdSMike Anderson { 4151e5b2bdSMike Anderson kmem_cache_free(_dm_event_cache, event); 4251e5b2bdSMike Anderson } 4351e5b2bdSMike Anderson 4451e5b2bdSMike Anderson static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md) 4551e5b2bdSMike Anderson { 4651e5b2bdSMike Anderson struct dm_uevent *event; 4751e5b2bdSMike Anderson 4851e5b2bdSMike Anderson event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC); 4951e5b2bdSMike Anderson if (!event) 5051e5b2bdSMike Anderson return NULL; 5151e5b2bdSMike Anderson 5251e5b2bdSMike Anderson INIT_LIST_HEAD(&event->elist); 5351e5b2bdSMike Anderson event->md = md; 5451e5b2bdSMike Anderson 5551e5b2bdSMike Anderson return event; 5651e5b2bdSMike Anderson } 5751e5b2bdSMike Anderson 587a8c3d3bSMike Anderson static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md, 597a8c3d3bSMike Anderson struct dm_target *ti, 607a8c3d3bSMike Anderson enum kobject_action action, 617a8c3d3bSMike Anderson const char *dm_action, 627a8c3d3bSMike Anderson const char *path, 637a8c3d3bSMike Anderson unsigned nr_valid_paths) 647a8c3d3bSMike Anderson { 657a8c3d3bSMike Anderson struct dm_uevent *event; 667a8c3d3bSMike Anderson 677a8c3d3bSMike Anderson event = dm_uevent_alloc(md); 687a8c3d3bSMike Anderson if (!event) { 69e46b272bSHarvey Harrison DMERR("%s: dm_uevent_alloc() failed", __func__); 707a8c3d3bSMike Anderson goto err_nomem; 717a8c3d3bSMike Anderson } 727a8c3d3bSMike Anderson 737a8c3d3bSMike Anderson event->action = action; 747a8c3d3bSMike Anderson 757a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) { 767a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_TARGET failed", 77e46b272bSHarvey Harrison __func__); 787a8c3d3bSMike Anderson goto err_add; 797a8c3d3bSMike Anderson } 807a8c3d3bSMike Anderson 817a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) { 827a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_ACTION failed", 83e46b272bSHarvey Harrison __func__); 847a8c3d3bSMike Anderson goto err_add; 857a8c3d3bSMike Anderson } 867a8c3d3bSMike Anderson 877a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u", 887a8c3d3bSMike Anderson dm_next_uevent_seq(md))) { 897a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_SEQNUM failed", 90e46b272bSHarvey Harrison __func__); 917a8c3d3bSMike Anderson goto err_add; 927a8c3d3bSMike Anderson } 937a8c3d3bSMike Anderson 947a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) { 95e46b272bSHarvey Harrison DMERR("%s: add_uevent_var() for DM_PATH failed", __func__); 967a8c3d3bSMike Anderson goto err_add; 977a8c3d3bSMike Anderson } 987a8c3d3bSMike Anderson 997a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d", 1007a8c3d3bSMike Anderson nr_valid_paths)) { 1017a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed", 102e46b272bSHarvey Harrison __func__); 1037a8c3d3bSMike Anderson goto err_add; 1047a8c3d3bSMike Anderson } 1057a8c3d3bSMike Anderson 1067a8c3d3bSMike Anderson return event; 1077a8c3d3bSMike Anderson 1087a8c3d3bSMike Anderson err_add: 1097a8c3d3bSMike Anderson dm_uevent_free(event); 1107a8c3d3bSMike Anderson err_nomem: 1117a8c3d3bSMike Anderson return ERR_PTR(-ENOMEM); 1127a8c3d3bSMike Anderson } 1137a8c3d3bSMike Anderson 1147a8c3d3bSMike Anderson /** 1157a8c3d3bSMike Anderson * dm_send_uevents - send uevents for given list 1167a8c3d3bSMike Anderson * 1177a8c3d3bSMike Anderson * @events: list of events to send 1187a8c3d3bSMike Anderson * @kobj: kobject generating event 1197a8c3d3bSMike Anderson * 1207a8c3d3bSMike Anderson */ 1217a8c3d3bSMike Anderson void dm_send_uevents(struct list_head *events, struct kobject *kobj) 1227a8c3d3bSMike Anderson { 1237a8c3d3bSMike Anderson int r; 1247a8c3d3bSMike Anderson struct dm_uevent *event, *next; 1257a8c3d3bSMike Anderson 1267a8c3d3bSMike Anderson list_for_each_entry_safe(event, next, events, elist) { 1277a8c3d3bSMike Anderson list_del_init(&event->elist); 1287a8c3d3bSMike Anderson 1297a8c3d3bSMike Anderson /* 1306076905bSMikulas Patocka * When a device is being removed this copy fails and we 1316076905bSMikulas Patocka * discard these unsent events. 1327a8c3d3bSMike Anderson */ 1337a8c3d3bSMike Anderson if (dm_copy_name_and_uuid(event->md, event->name, 1347a8c3d3bSMike Anderson event->uuid)) { 1356076905bSMikulas Patocka DMINFO("%s: skipping sending uevent for lost device", 136e46b272bSHarvey Harrison __func__); 1377a8c3d3bSMike Anderson goto uevent_free; 1387a8c3d3bSMike Anderson } 1397a8c3d3bSMike Anderson 1407a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) { 1417a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_NAME failed", 142e46b272bSHarvey Harrison __func__); 1437a8c3d3bSMike Anderson goto uevent_free; 1447a8c3d3bSMike Anderson } 1457a8c3d3bSMike Anderson 1467a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) { 1477a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_UUID failed", 148e46b272bSHarvey Harrison __func__); 1497a8c3d3bSMike Anderson goto uevent_free; 1507a8c3d3bSMike Anderson } 1517a8c3d3bSMike Anderson 1527a8c3d3bSMike Anderson r = kobject_uevent_env(kobj, event->action, event->ku_env.envp); 1537a8c3d3bSMike Anderson if (r) 154e46b272bSHarvey Harrison DMERR("%s: kobject_uevent_env failed", __func__); 1557a8c3d3bSMike Anderson uevent_free: 1567a8c3d3bSMike Anderson dm_uevent_free(event); 1577a8c3d3bSMike Anderson } 1587a8c3d3bSMike Anderson } 1597a8c3d3bSMike Anderson EXPORT_SYMBOL_GPL(dm_send_uevents); 1607a8c3d3bSMike Anderson 1617a8c3d3bSMike Anderson /** 1627a8c3d3bSMike Anderson * dm_path_uevent - called to create a new path event and queue it 1637a8c3d3bSMike Anderson * 1647a8c3d3bSMike Anderson * @event_type: path event type enum 1657a8c3d3bSMike Anderson * @ti: pointer to a dm_target 1667a8c3d3bSMike Anderson * @path: string containing pathname 1677a8c3d3bSMike Anderson * @nr_valid_paths: number of valid paths remaining 1687a8c3d3bSMike Anderson * 1697a8c3d3bSMike Anderson */ 1707a8c3d3bSMike Anderson void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti, 1717a8c3d3bSMike Anderson const char *path, unsigned nr_valid_paths) 1727a8c3d3bSMike Anderson { 1737a8c3d3bSMike Anderson struct mapped_device *md = dm_table_get_md(ti->table); 1747a8c3d3bSMike Anderson struct dm_uevent *event; 1757a8c3d3bSMike Anderson 1767a8c3d3bSMike Anderson if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) { 177e46b272bSHarvey Harrison DMERR("%s: Invalid event_type %d", __func__, event_type); 178ecdb2e25SKiyoshi Ueda return; 1797a8c3d3bSMike Anderson } 1807a8c3d3bSMike Anderson 1817a8c3d3bSMike Anderson event = dm_build_path_uevent(md, ti, 1827a8c3d3bSMike Anderson _dm_uevent_type_names[event_type].action, 1837a8c3d3bSMike Anderson _dm_uevent_type_names[event_type].name, 1847a8c3d3bSMike Anderson path, nr_valid_paths); 1857a8c3d3bSMike Anderson if (IS_ERR(event)) 186ecdb2e25SKiyoshi Ueda return; 1877a8c3d3bSMike Anderson 1887a8c3d3bSMike Anderson dm_uevent_add(md, &event->elist); 1897a8c3d3bSMike Anderson } 1907a8c3d3bSMike Anderson EXPORT_SYMBOL_GPL(dm_path_uevent); 1917a8c3d3bSMike Anderson 19251e5b2bdSMike Anderson int dm_uevent_init(void) 19351e5b2bdSMike Anderson { 19451e5b2bdSMike Anderson _dm_event_cache = KMEM_CACHE(dm_uevent, 0); 19551e5b2bdSMike Anderson if (!_dm_event_cache) 19651e5b2bdSMike Anderson return -ENOMEM; 19751e5b2bdSMike Anderson 19851e5b2bdSMike Anderson DMINFO("version 1.0.3"); 19951e5b2bdSMike Anderson 20051e5b2bdSMike Anderson return 0; 20151e5b2bdSMike Anderson } 20251e5b2bdSMike Anderson 20351e5b2bdSMike Anderson void dm_uevent_exit(void) 20451e5b2bdSMike Anderson { 20551e5b2bdSMike Anderson kmem_cache_destroy(_dm_event_cache); 20651e5b2bdSMike Anderson } 207