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> 24*7a8c3d3bSMike 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 31*7a8c3d3bSMike Anderson static const struct { 32*7a8c3d3bSMike Anderson enum dm_uevent_type type; 33*7a8c3d3bSMike Anderson enum kobject_action action; 34*7a8c3d3bSMike Anderson char *name; 35*7a8c3d3bSMike Anderson } _dm_uevent_type_names[] = { 36*7a8c3d3bSMike Anderson {DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"}, 37*7a8c3d3bSMike Anderson {DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"}, 38*7a8c3d3bSMike Anderson }; 39*7a8c3d3bSMike 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; 47*7a8c3d3bSMike Anderson char name[DM_NAME_LEN]; 48*7a8c3d3bSMike 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 70*7a8c3d3bSMike Anderson static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md, 71*7a8c3d3bSMike Anderson struct dm_target *ti, 72*7a8c3d3bSMike Anderson enum kobject_action action, 73*7a8c3d3bSMike Anderson const char *dm_action, 74*7a8c3d3bSMike Anderson const char *path, 75*7a8c3d3bSMike Anderson unsigned nr_valid_paths) 76*7a8c3d3bSMike Anderson { 77*7a8c3d3bSMike Anderson struct dm_uevent *event; 78*7a8c3d3bSMike Anderson 79*7a8c3d3bSMike Anderson event = dm_uevent_alloc(md); 80*7a8c3d3bSMike Anderson if (!event) { 81*7a8c3d3bSMike Anderson DMERR("%s: dm_uevent_alloc() failed", __FUNCTION__); 82*7a8c3d3bSMike Anderson goto err_nomem; 83*7a8c3d3bSMike Anderson } 84*7a8c3d3bSMike Anderson 85*7a8c3d3bSMike Anderson event->action = action; 86*7a8c3d3bSMike Anderson 87*7a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) { 88*7a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_TARGET failed", 89*7a8c3d3bSMike Anderson __FUNCTION__); 90*7a8c3d3bSMike Anderson goto err_add; 91*7a8c3d3bSMike Anderson } 92*7a8c3d3bSMike Anderson 93*7a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) { 94*7a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_ACTION failed", 95*7a8c3d3bSMike Anderson __FUNCTION__); 96*7a8c3d3bSMike Anderson goto err_add; 97*7a8c3d3bSMike Anderson } 98*7a8c3d3bSMike Anderson 99*7a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u", 100*7a8c3d3bSMike Anderson dm_next_uevent_seq(md))) { 101*7a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_SEQNUM failed", 102*7a8c3d3bSMike Anderson __FUNCTION__); 103*7a8c3d3bSMike Anderson goto err_add; 104*7a8c3d3bSMike Anderson } 105*7a8c3d3bSMike Anderson 106*7a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) { 107*7a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_PATH failed", __FUNCTION__); 108*7a8c3d3bSMike Anderson goto err_add; 109*7a8c3d3bSMike Anderson } 110*7a8c3d3bSMike Anderson 111*7a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d", 112*7a8c3d3bSMike Anderson nr_valid_paths)) { 113*7a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed", 114*7a8c3d3bSMike Anderson __FUNCTION__); 115*7a8c3d3bSMike Anderson goto err_add; 116*7a8c3d3bSMike Anderson } 117*7a8c3d3bSMike Anderson 118*7a8c3d3bSMike Anderson return event; 119*7a8c3d3bSMike Anderson 120*7a8c3d3bSMike Anderson err_add: 121*7a8c3d3bSMike Anderson dm_uevent_free(event); 122*7a8c3d3bSMike Anderson err_nomem: 123*7a8c3d3bSMike Anderson return ERR_PTR(-ENOMEM); 124*7a8c3d3bSMike Anderson } 125*7a8c3d3bSMike Anderson 126*7a8c3d3bSMike Anderson /** 127*7a8c3d3bSMike Anderson * dm_send_uevents - send uevents for given list 128*7a8c3d3bSMike Anderson * 129*7a8c3d3bSMike Anderson * @events: list of events to send 130*7a8c3d3bSMike Anderson * @kobj: kobject generating event 131*7a8c3d3bSMike Anderson * 132*7a8c3d3bSMike Anderson */ 133*7a8c3d3bSMike Anderson void dm_send_uevents(struct list_head *events, struct kobject *kobj) 134*7a8c3d3bSMike Anderson { 135*7a8c3d3bSMike Anderson int r; 136*7a8c3d3bSMike Anderson struct dm_uevent *event, *next; 137*7a8c3d3bSMike Anderson 138*7a8c3d3bSMike Anderson list_for_each_entry_safe(event, next, events, elist) { 139*7a8c3d3bSMike Anderson list_del_init(&event->elist); 140*7a8c3d3bSMike Anderson 141*7a8c3d3bSMike Anderson /* 142*7a8c3d3bSMike Anderson * Need to call dm_copy_name_and_uuid from here for now. 143*7a8c3d3bSMike Anderson * Context of previous var adds and locking used for 144*7a8c3d3bSMike Anderson * hash_cell not compatable. 145*7a8c3d3bSMike Anderson */ 146*7a8c3d3bSMike Anderson if (dm_copy_name_and_uuid(event->md, event->name, 147*7a8c3d3bSMike Anderson event->uuid)) { 148*7a8c3d3bSMike Anderson DMERR("%s: dm_copy_name_and_uuid() failed", 149*7a8c3d3bSMike Anderson __FUNCTION__); 150*7a8c3d3bSMike Anderson goto uevent_free; 151*7a8c3d3bSMike Anderson } 152*7a8c3d3bSMike Anderson 153*7a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) { 154*7a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_NAME failed", 155*7a8c3d3bSMike Anderson __FUNCTION__); 156*7a8c3d3bSMike Anderson goto uevent_free; 157*7a8c3d3bSMike Anderson } 158*7a8c3d3bSMike Anderson 159*7a8c3d3bSMike Anderson if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) { 160*7a8c3d3bSMike Anderson DMERR("%s: add_uevent_var() for DM_UUID failed", 161*7a8c3d3bSMike Anderson __FUNCTION__); 162*7a8c3d3bSMike Anderson goto uevent_free; 163*7a8c3d3bSMike Anderson } 164*7a8c3d3bSMike Anderson 165*7a8c3d3bSMike Anderson r = kobject_uevent_env(kobj, event->action, event->ku_env.envp); 166*7a8c3d3bSMike Anderson if (r) 167*7a8c3d3bSMike Anderson DMERR("%s: kobject_uevent_env failed", __FUNCTION__); 168*7a8c3d3bSMike Anderson uevent_free: 169*7a8c3d3bSMike Anderson dm_uevent_free(event); 170*7a8c3d3bSMike Anderson } 171*7a8c3d3bSMike Anderson } 172*7a8c3d3bSMike Anderson EXPORT_SYMBOL_GPL(dm_send_uevents); 173*7a8c3d3bSMike Anderson 174*7a8c3d3bSMike Anderson /** 175*7a8c3d3bSMike Anderson * dm_path_uevent - called to create a new path event and queue it 176*7a8c3d3bSMike Anderson * 177*7a8c3d3bSMike Anderson * @event_type: path event type enum 178*7a8c3d3bSMike Anderson * @ti: pointer to a dm_target 179*7a8c3d3bSMike Anderson * @path: string containing pathname 180*7a8c3d3bSMike Anderson * @nr_valid_paths: number of valid paths remaining 181*7a8c3d3bSMike Anderson * 182*7a8c3d3bSMike Anderson */ 183*7a8c3d3bSMike Anderson void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti, 184*7a8c3d3bSMike Anderson const char *path, unsigned nr_valid_paths) 185*7a8c3d3bSMike Anderson { 186*7a8c3d3bSMike Anderson struct mapped_device *md = dm_table_get_md(ti->table); 187*7a8c3d3bSMike Anderson struct dm_uevent *event; 188*7a8c3d3bSMike Anderson 189*7a8c3d3bSMike Anderson if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) { 190*7a8c3d3bSMike Anderson DMERR("%s: Invalid event_type %d", __FUNCTION__, event_type); 191*7a8c3d3bSMike Anderson goto out; 192*7a8c3d3bSMike Anderson } 193*7a8c3d3bSMike Anderson 194*7a8c3d3bSMike Anderson event = dm_build_path_uevent(md, ti, 195*7a8c3d3bSMike Anderson _dm_uevent_type_names[event_type].action, 196*7a8c3d3bSMike Anderson _dm_uevent_type_names[event_type].name, 197*7a8c3d3bSMike Anderson path, nr_valid_paths); 198*7a8c3d3bSMike Anderson if (IS_ERR(event)) 199*7a8c3d3bSMike Anderson goto out; 200*7a8c3d3bSMike Anderson 201*7a8c3d3bSMike Anderson dm_uevent_add(md, &event->elist); 202*7a8c3d3bSMike Anderson 203*7a8c3d3bSMike Anderson out: 204*7a8c3d3bSMike Anderson dm_put(md); 205*7a8c3d3bSMike Anderson } 206*7a8c3d3bSMike Anderson EXPORT_SYMBOL_GPL(dm_path_uevent); 207*7a8c3d3bSMike Anderson 20851e5b2bdSMike Anderson int dm_uevent_init(void) 20951e5b2bdSMike Anderson { 21051e5b2bdSMike Anderson _dm_event_cache = KMEM_CACHE(dm_uevent, 0); 21151e5b2bdSMike Anderson if (!_dm_event_cache) 21251e5b2bdSMike Anderson return -ENOMEM; 21351e5b2bdSMike Anderson 21451e5b2bdSMike Anderson DMINFO("version 1.0.3"); 21551e5b2bdSMike Anderson 21651e5b2bdSMike Anderson return 0; 21751e5b2bdSMike Anderson } 21851e5b2bdSMike Anderson 21951e5b2bdSMike Anderson void dm_uevent_exit(void) 22051e5b2bdSMike Anderson { 22151e5b2bdSMike Anderson kmem_cache_destroy(_dm_event_cache); 22251e5b2bdSMike Anderson } 223