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1 | /* |
2 | * Device Mapper Uevent Support (dm-uevent) |
3 | * |
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. |
8 | * |
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. |
13 | * |
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. |
17 | * |
18 | * Copyright IBM Corporation, 2007 |
19 | * Author: Mike Anderson <andmike@linux.vnet.ibm.com> |
20 | */ |
21 | #include <linux/list.h> |
22 | #include <linux/slab.h> |
23 | #include <linux/kobject.h> |
24 | #include <linux/dm-ioctl.h> |
25 | |
26 | #include "dm.h" |
27 | #include "dm-uevent.h" |
28 | |
29 | #define DM_MSG_PREFIX "uevent" |
30 | |
31 | static const struct { |
32 | enum dm_uevent_type type; |
33 | enum kobject_action action; |
34 | char *name; |
35 | } _dm_uevent_type_names[] = { |
36 | {DM_UEVENT_PATH_FAILED, KOBJ_CHANGE, "PATH_FAILED"}, |
37 | {DM_UEVENT_PATH_REINSTATED, KOBJ_CHANGE, "PATH_REINSTATED"}, |
38 | }; |
39 | |
40 | static struct kmem_cache *_dm_event_cache; |
41 | |
42 | struct dm_uevent { |
43 | struct mapped_device *md; |
44 | enum kobject_action action; |
45 | struct kobj_uevent_env ku_env; |
46 | struct list_head elist; |
47 | char name[DM_NAME_LEN]; |
48 | char uuid[DM_UUID_LEN]; |
49 | }; |
50 | |
51 | static void dm_uevent_free(struct dm_uevent *event) |
52 | { |
53 | kmem_cache_free(_dm_event_cache, event); |
54 | } |
55 | |
56 | static struct dm_uevent *dm_uevent_alloc(struct mapped_device *md) |
57 | { |
58 | struct dm_uevent *event; |
59 | |
60 | event = kmem_cache_zalloc(_dm_event_cache, GFP_ATOMIC); |
61 | if (!event) |
62 | return NULL; |
63 | |
64 | INIT_LIST_HEAD(&event->elist); |
65 | event->md = md; |
66 | |
67 | return event; |
68 | } |
69 | |
70 | static struct dm_uevent *dm_build_path_uevent(struct mapped_device *md, |
71 | struct dm_target *ti, |
72 | enum kobject_action action, |
73 | const char *dm_action, |
74 | const char *path, |
75 | unsigned nr_valid_paths) |
76 | { |
77 | struct dm_uevent *event; |
78 | |
79 | event = dm_uevent_alloc(md); |
80 | if (!event) { |
81 | DMERR("%s: dm_uevent_alloc() failed", __func__); |
82 | goto err_nomem; |
83 | } |
84 | |
85 | event->action = action; |
86 | |
87 | if (add_uevent_var(&event->ku_env, "DM_TARGET=%s", ti->type->name)) { |
88 | DMERR("%s: add_uevent_var() for DM_TARGET failed", |
89 | __func__); |
90 | goto err_add; |
91 | } |
92 | |
93 | if (add_uevent_var(&event->ku_env, "DM_ACTION=%s", dm_action)) { |
94 | DMERR("%s: add_uevent_var() for DM_ACTION failed", |
95 | __func__); |
96 | goto err_add; |
97 | } |
98 | |
99 | if (add_uevent_var(&event->ku_env, "DM_SEQNUM=%u", |
100 | dm_next_uevent_seq(md))) { |
101 | DMERR("%s: add_uevent_var() for DM_SEQNUM failed", |
102 | __func__); |
103 | goto err_add; |
104 | } |
105 | |
106 | if (add_uevent_var(&event->ku_env, "DM_PATH=%s", path)) { |
107 | DMERR("%s: add_uevent_var() for DM_PATH failed", __func__); |
108 | goto err_add; |
109 | } |
110 | |
111 | if (add_uevent_var(&event->ku_env, "DM_NR_VALID_PATHS=%d", |
112 | nr_valid_paths)) { |
113 | DMERR("%s: add_uevent_var() for DM_NR_VALID_PATHS failed", |
114 | __func__); |
115 | goto err_add; |
116 | } |
117 | |
118 | return event; |
119 | |
120 | err_add: |
121 | dm_uevent_free(event); |
122 | err_nomem: |
123 | return ERR_PTR(-ENOMEM); |
124 | } |
125 | |
126 | /** |
127 | * dm_send_uevents - send uevents for given list |
128 | * |
129 | * @events: list of events to send |
130 | * @kobj: kobject generating event |
131 | * |
132 | */ |
133 | void dm_send_uevents(struct list_head *events, struct kobject *kobj) |
134 | { |
135 | int r; |
136 | struct dm_uevent *event, *next; |
137 | |
138 | list_for_each_entry_safe(event, next, events, elist) { |
139 | list_del_init(&event->elist); |
140 | |
141 | /* |
142 | * When a device is being removed this copy fails and we |
143 | * discard these unsent events. |
144 | */ |
145 | if (dm_copy_name_and_uuid(event->md, event->name, |
146 | event->uuid)) { |
147 | DMINFO("%s: skipping sending uevent for lost device", |
148 | __func__); |
149 | goto uevent_free; |
150 | } |
151 | |
152 | if (add_uevent_var(&event->ku_env, "DM_NAME=%s", event->name)) { |
153 | DMERR("%s: add_uevent_var() for DM_NAME failed", |
154 | __func__); |
155 | goto uevent_free; |
156 | } |
157 | |
158 | if (add_uevent_var(&event->ku_env, "DM_UUID=%s", event->uuid)) { |
159 | DMERR("%s: add_uevent_var() for DM_UUID failed", |
160 | __func__); |
161 | goto uevent_free; |
162 | } |
163 | |
164 | r = kobject_uevent_env(kobj, event->action, event->ku_env.envp); |
165 | if (r) |
166 | DMERR("%s: kobject_uevent_env failed", __func__); |
167 | uevent_free: |
168 | dm_uevent_free(event); |
169 | } |
170 | } |
171 | EXPORT_SYMBOL_GPL(dm_send_uevents); |
172 | |
173 | /** |
174 | * dm_path_uevent - called to create a new path event and queue it |
175 | * |
176 | * @event_type: path event type enum |
177 | * @ti: pointer to a dm_target |
178 | * @path: string containing pathname |
179 | * @nr_valid_paths: number of valid paths remaining |
180 | * |
181 | */ |
182 | void dm_path_uevent(enum dm_uevent_type event_type, struct dm_target *ti, |
183 | const char *path, unsigned nr_valid_paths) |
184 | { |
185 | struct mapped_device *md = dm_table_get_md(ti->table); |
186 | struct dm_uevent *event; |
187 | |
188 | if (event_type >= ARRAY_SIZE(_dm_uevent_type_names)) { |
189 | DMERR("%s: Invalid event_type %d", __func__, event_type); |
190 | return; |
191 | } |
192 | |
193 | event = dm_build_path_uevent(md, ti, |
194 | _dm_uevent_type_names[event_type].action, |
195 | _dm_uevent_type_names[event_type].name, |
196 | path, nr_valid_paths); |
197 | if (IS_ERR(event)) |
198 | return; |
199 | |
200 | dm_uevent_add(md, &event->elist); |
201 | } |
202 | EXPORT_SYMBOL_GPL(dm_path_uevent); |
203 | |
204 | int dm_uevent_init(void) |
205 | { |
206 | _dm_event_cache = KMEM_CACHE(dm_uevent, 0); |
207 | if (!_dm_event_cache) |
208 | return -ENOMEM; |
209 | |
210 | DMINFO("version 1.0.3"); |
211 | |
212 | return 0; |
213 | } |
214 | |
215 | void dm_uevent_exit(void) |
216 | { |
217 | kmem_cache_destroy(_dm_event_cache); |
218 | } |
219 |
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