2 * Device Mapper Uevent Support (dm-uevent)
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 * Copyright IBM Corporation, 2007
19 * Author: Mike Anderson <andmike@linux.vnet.ibm.com>
21 #include <linux/list.h>
22 #include <linux/slab.h>
23 #include <linux/kobject.h>
24 #include <linux/dm-ioctl.h>
25 #include <linux/export.h>
28 #include "dm-uevent.h"
30 #define DM_MSG_PREFIX "uevent"
33 enum dm_uevent_type type;
34 enum kobject_action action;
36 } _dm_uevent_type_names[] = {
37 {DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"},
38 {DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"},
41 static struct kmem_cache *_dm_event_cache;
44 struct mapped_device *md;
45 enum kobject_action action;
46 struct kobj_uevent_env ku_env;
47 struct list_head elist;
48 char name[DM_NAME_LEN];
49 char uuid[DM_UUID_LEN];
52 static void dm_uevent_free(struct dm_uevent *event)
54 kmem_cache_free(_dm_event_cache, event);
57 static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md)
59 struct dm_uevent *event;
61 event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC);
65 INIT_LIST_HEAD(&event->elist);
71 static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md,
73 enum kobject_action action,
74 const char *dm_action,
76 unsigned nr_valid_paths)
78 struct dm_uevent *event;
80 event = dm_uevent_alloc(md);
82 DMERR("%s: dm_uevent_alloc() failed", __func__);
86 event->action = action;
88 if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) {
89 DMERR("%s: add_uevent_var() for DM_TARGET failed",
94 if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) {
95 DMERR("%s: add_uevent_var() for DM_ACTION failed",
100 if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u",
101 dm_next_uevent_seq(md))) {
102 DMERR("%s: add_uevent_var() for DM_SEQNUM failed",
107 if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) {
108 DMERR("%s: add_uevent_var() for DM_PATH failed", __func__);
112 if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d",
114 DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed",
122 dm_uevent_free(event);
124 return ERR_PTR(-ENOMEM);
128 * dm_send_uevents - send uevents for given list
130 * @events: list of events to send
131 * @kobj: kobject generating event
134 void dm_send_uevents(struct list_head *events, struct kobject *kobj)
137 struct dm_uevent *event, *next;
139 list_for_each_entry_safe(event, next, events, elist) {
140 list_del_init(&event->elist);
143 * When a device is being removed this copy fails and we
144 * discard these unsent events.
146 if (dm_copy_name_and_uuid(event->md, event->name,
148 DMINFO("%s: skipping sending uevent for lost device",
153 if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) {
154 DMERR("%s: add_uevent_var() for DM_NAME failed",
159 if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) {
160 DMERR("%s: add_uevent_var() for DM_UUID failed",
165 r = kobject_uevent_env(kobj, event->action, event->ku_env.envp);
167 DMERR("%s: kobject_uevent_env failed", __func__);
169 dm_uevent_free(event);
172 EXPORT_SYMBOL_GPL(dm_send_uevents);
175 * dm_path_uevent - called to create a new path event and queue it
177 * @event_type: path event type enum
178 * @ti: pointer to a dm_target
179 * @path: string containing pathname
180 * @nr_valid_paths: number of valid paths remaining
183 void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti,
184 const char *path, unsigned nr_valid_paths)
186 struct mapped_device *md = dm_table_get_md(ti->table);
187 struct dm_uevent *event;
189 if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) {
190 DMERR("%s: Invalid event_type %d", __func__, event_type);
194 event = dm_build_path_uevent(md, ti,
195 _dm_uevent_type_names[event_type].action,
196 _dm_uevent_type_names[event_type].name,
197 path, nr_valid_paths);
201 dm_uevent_add(md, &event->elist);
203 EXPORT_SYMBOL_GPL(dm_path_uevent);
205 int dm_uevent_init(void)
207 _dm_event_cache = KMEM_CACHE(dm_uevent, 0);
208 if (!_dm_event_cache)
211 DMINFO("version 1.0.3");
216 void dm_uevent_exit(void)
218 kmem_cache_destroy(_dm_event_cache);