151e5b2bdSMike Anderson /* 251e5b2bdSMike Anderson * Device Mapper Uevent Support (dm-uevent) 351e5b2bdSMike Anderson * 451e5b2bdSMike Anderson * This program is free software; you can redistribute it and/or modify it 551e5b2bdSMike Anderson * under the terms of the GNU General Public License as published by the 651e5b2bdSMike Anderson * Free Software Foundation; either version 2 of the License, or (at your 751e5b2bdSMike Anderson * option) any later version. 851e5b2bdSMike Anderson * 951e5b2bdSMike Anderson * This program is distributed in the hope that it will be useful, but 1051e5b2bdSMike Anderson * WITHOUT ANY WARRANTY; without even the implied warranty of 1151e5b2bdSMike Anderson * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1251e5b2bdSMike Anderson * General Public License for more details. 1351e5b2bdSMike Anderson * 1451e5b2bdSMike Anderson * You should have received a copy of the GNU General Public License along 1551e5b2bdSMike Anderson * with this program; if not, write to the Free Software Foundation, Inc., 1651e5b2bdSMike Anderson * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 1751e5b2bdSMike Anderson * 1851e5b2bdSMike Anderson * Copyright IBM Corporation, 2007 1951e5b2bdSMike Anderson * Author: Mike Anderson <andmike@linux.vnet.ibm.com> 2051e5b2bdSMike Anderson */ 2151e5b2bdSMike Anderson #include <linux/list.h> 2251e5b2bdSMike Anderson #include <linux/slab.h> 2351e5b2bdSMike Anderson #include <linux/kobject.h> 247a8c3d3bSMike Anderson #include <linux/dm-ioctl.h> 2551e5b2bdSMike Anderson 2651e5b2bdSMike Anderson #include "dm.h" 2751e5b2bdSMike Anderson #include "dm-uevent.h" 2851e5b2bdSMike Anderson 2951e5b2bdSMike Anderson #define DM_MSG_PREFIX "uevent" 3051e5b2bdSMike Anderson 317a8c3d3bSMike Anderson static const struct { 327a8c3d3bSMike Anderson enum dm_uevent_type type; 337a8c3d3bSMike Anderson enum kobject_action action; 347a8c3d3bSMike Anderson char *name; 357a8c3d3bSMike Anderson } _dm_uevent_type_names[] = { 367a8c3d3bSMike Anderson {DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"}, 377a8c3d3bSMike Anderson {DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"}, 387a8c3d3bSMike Anderson }; 397a8c3d3bSMike Anderson 4051e5b2bdSMike Anderson static struct kmem_cache *_dm_event_cache; 4151e5b2bdSMike Anderson 4251e5b2bdSMike Anderson struct dm_uevent { 4351e5b2bdSMike Anderson struct mapped_device *md; 4451e5b2bdSMike Anderson enum kobject_action action; 4551e5b2bdSMike Anderson struct kobj_uevent_env ku_env; 4651e5b2bdSMike Anderson struct list_head elist; 477a8c3d3bSMike Anderson char name[DM_NAME_LEN]; 487a8c3d3bSMike Anderson char uuid[DM_UUID_LEN]; 4951e5b2bdSMike Anderson }; 5051e5b2bdSMike Anderson 5151e5b2bdSMike Anderson static void dm_uevent_free(struct dm_uevent *event) 5251e5b2bdSMike Anderson { 5351e5b2bdSMike Anderson kmem_cache_free(_dm_event_cache, event); 5451e5b2bdSMike Anderson } 5551e5b2bdSMike Anderson 5651e5b2bdSMike Anderson static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md) 5751e5b2bdSMike Anderson { 5851e5b2bdSMike Anderson struct dm_uevent *event; 5951e5b2bdSMike Anderson 6051e5b2bdSMike Anderson event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC); 6151e5b2bdSMike Anderson if (!event) 6251e5b2bdSMike Anderson return NULL; 6351e5b2bdSMike Anderson 6451e5b2bdSMike Anderson INIT_LIST_HEAD(&event->elist); 6551e5b2bdSMike Anderson event->md = md; 6651e5b2bdSMike Anderson 6751e5b2bdSMike Anderson return event; 6851e5b2bdSMike Anderson } 6951e5b2bdSMike Anderson 707a8c3d3bSMike Anderson static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md, 717a8c3d3bSMike Anderson struct dm_target *ti, 727a8c3d3bSMike Anderson enum kobject_action action, 737a8c3d3bSMike Anderson const char *dm_action, 747a8c3d3bSMike Anderson const char *path, 757a8c3d3bSMike Anderson unsigned nr_valid_paths) 767a8c3d3bSMike Anderson { 777a8c3d3bSMike Anderson struct dm_uevent *event; 787a8c3d3bSMike Anderson 797a8c3d3bSMike Anderson event = dm_uevent_alloc(md); 807a8c3d3bSMike Anderson if (!event) { 81e46b272bSHarvey Harrison DMERR("%s: dm_uevent_alloc() failed", __func__); 827a8c3d3bSMike Anderson goto err_nomem; 837a8c3d3bSMike Anderson } 847a8c3d3bSMike Anderson 857a8c3d3bSMike Anderson event->action = action; 867a8c3d3bSMike Anderson 877a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) { 887a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_TARGET failed", 89e46b272bSHarvey Harrison __func__); 907a8c3d3bSMike Anderson goto err_add; 917a8c3d3bSMike Anderson } 927a8c3d3bSMike Anderson 937a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) { 947a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_ACTION failed", 95e46b272bSHarvey Harrison __func__); 967a8c3d3bSMike Anderson goto err_add; 977a8c3d3bSMike Anderson } 987a8c3d3bSMike Anderson 997a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u", 1007a8c3d3bSMike Anderson dm_next_uevent_seq(md))) { 1017a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_SEQNUM failed", 102e46b272bSHarvey Harrison __func__); 1037a8c3d3bSMike Anderson goto err_add; 1047a8c3d3bSMike Anderson } 1057a8c3d3bSMike Anderson 1067a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) { 107e46b272bSHarvey Harrison DMERR("%s: add_uevent_var() for DM_PATH failed", __func__); 1087a8c3d3bSMike Anderson goto err_add; 1097a8c3d3bSMike Anderson } 1107a8c3d3bSMike Anderson 1117a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d", 1127a8c3d3bSMike Anderson nr_valid_paths)) { 1137a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed", 114e46b272bSHarvey Harrison __func__); 1157a8c3d3bSMike Anderson goto err_add; 1167a8c3d3bSMike Anderson } 1177a8c3d3bSMike Anderson 1187a8c3d3bSMike Anderson return event; 1197a8c3d3bSMike Anderson 1207a8c3d3bSMike Anderson err_add: 1217a8c3d3bSMike Anderson dm_uevent_free(event); 1227a8c3d3bSMike Anderson err_nomem: 1237a8c3d3bSMike Anderson return ERR_PTR(-ENOMEM); 1247a8c3d3bSMike Anderson } 1257a8c3d3bSMike Anderson 1267a8c3d3bSMike Anderson /** 1277a8c3d3bSMike Anderson * dm_send_uevents - send uevents for given list 1287a8c3d3bSMike Anderson * 1297a8c3d3bSMike Anderson * @events: list of events to send 1307a8c3d3bSMike Anderson * @kobj: kobject generating event 1317a8c3d3bSMike Anderson * 1327a8c3d3bSMike Anderson */ 1337a8c3d3bSMike Anderson void dm_send_uevents(struct list_head *events, struct kobject *kobj) 1347a8c3d3bSMike Anderson { 1357a8c3d3bSMike Anderson int r; 1367a8c3d3bSMike Anderson struct dm_uevent *event, *next; 1377a8c3d3bSMike Anderson 1387a8c3d3bSMike Anderson list_for_each_entry_safe(event, next, events, elist) { 1397a8c3d3bSMike Anderson list_del_init(&event->elist); 1407a8c3d3bSMike Anderson 1417a8c3d3bSMike Anderson /* 142*6076905bSMikulas Patocka * When a device is being removed this copy fails and we 143*6076905bSMikulas Patocka * discard these unsent events. 1447a8c3d3bSMike Anderson */ 1457a8c3d3bSMike Anderson if (dm_copy_name_and_uuid(event->md, event->name, 1467a8c3d3bSMike Anderson event->uuid)) { 147*6076905bSMikulas Patocka DMINFO("%s: skipping sending uevent for lost device", 148e46b272bSHarvey Harrison __func__); 1497a8c3d3bSMike Anderson goto uevent_free; 1507a8c3d3bSMike Anderson } 1517a8c3d3bSMike Anderson 1527a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) { 1537a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_NAME failed", 154e46b272bSHarvey Harrison __func__); 1557a8c3d3bSMike Anderson goto uevent_free; 1567a8c3d3bSMike Anderson } 1577a8c3d3bSMike Anderson 1587a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) { 1597a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_UUID failed", 160e46b272bSHarvey Harrison __func__); 1617a8c3d3bSMike Anderson goto uevent_free; 1627a8c3d3bSMike Anderson } 1637a8c3d3bSMike Anderson 1647a8c3d3bSMike Anderson r = kobject_uevent_env(kobj, event->action, event->ku_env.envp); 1657a8c3d3bSMike Anderson if (r) 166e46b272bSHarvey Harrison DMERR("%s: kobject_uevent_env failed", __func__); 1677a8c3d3bSMike Anderson uevent_free: 1687a8c3d3bSMike Anderson dm_uevent_free(event); 1697a8c3d3bSMike Anderson } 1707a8c3d3bSMike Anderson } 1717a8c3d3bSMike Anderson EXPORT_SYMBOL_GPL(dm_send_uevents); 1727a8c3d3bSMike Anderson 1737a8c3d3bSMike Anderson /** 1747a8c3d3bSMike Anderson * dm_path_uevent - called to create a new path event and queue it 1757a8c3d3bSMike Anderson * 1767a8c3d3bSMike Anderson * @event_type: path event type enum 1777a8c3d3bSMike Anderson * @ti: pointer to a dm_target 1787a8c3d3bSMike Anderson * @path: string containing pathname 1797a8c3d3bSMike Anderson * @nr_valid_paths: number of valid paths remaining 1807a8c3d3bSMike Anderson * 1817a8c3d3bSMike Anderson */ 1827a8c3d3bSMike Anderson void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti, 1837a8c3d3bSMike Anderson const char *path, unsigned nr_valid_paths) 1847a8c3d3bSMike Anderson { 1857a8c3d3bSMike Anderson struct mapped_device *md = dm_table_get_md(ti->table); 1867a8c3d3bSMike Anderson struct dm_uevent *event; 1877a8c3d3bSMike Anderson 1887a8c3d3bSMike Anderson if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) { 189e46b272bSHarvey Harrison DMERR("%s: Invalid event_type %d", __func__, event_type); 1907a8c3d3bSMike Anderson goto out; 1917a8c3d3bSMike Anderson } 1927a8c3d3bSMike Anderson 1937a8c3d3bSMike Anderson event = dm_build_path_uevent(md, ti, 1947a8c3d3bSMike Anderson _dm_uevent_type_names[event_type].action, 1957a8c3d3bSMike Anderson _dm_uevent_type_names[event_type].name, 1967a8c3d3bSMike Anderson path, nr_valid_paths); 1977a8c3d3bSMike Anderson if (IS_ERR(event)) 1987a8c3d3bSMike Anderson goto out; 1997a8c3d3bSMike Anderson 2007a8c3d3bSMike Anderson dm_uevent_add(md, &event->elist); 2017a8c3d3bSMike Anderson 2027a8c3d3bSMike Anderson out: 2037a8c3d3bSMike Anderson dm_put(md); 2047a8c3d3bSMike Anderson } 2057a8c3d3bSMike Anderson EXPORT_SYMBOL_GPL(dm_path_uevent); 2067a8c3d3bSMike Anderson 20751e5b2bdSMike Anderson int dm_uevent_init(void) 20851e5b2bdSMike Anderson { 20951e5b2bdSMike Anderson _dm_event_cache = KMEM_CACHE(dm_uevent, 0); 21051e5b2bdSMike Anderson if (!_dm_event_cache) 21151e5b2bdSMike Anderson return -ENOMEM; 21251e5b2bdSMike Anderson 21351e5b2bdSMike Anderson DMINFO("version 1.0.3"); 21451e5b2bdSMike Anderson 21551e5b2bdSMike Anderson return 0; 21651e5b2bdSMike Anderson } 21751e5b2bdSMike Anderson 21851e5b2bdSMike Anderson void dm_uevent_exit(void) 21951e5b2bdSMike Anderson { 22051e5b2bdSMike Anderson kmem_cache_destroy(_dm_event_cache); 22151e5b2bdSMike Anderson } 222