Commit | Line | Data |
---|---|---|
6dc3064a DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
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, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
6dc3064a DG |
19 | #include <assert.h> |
20 | #include <inttypes.h> | |
21 | #include <string.h> | |
22 | #include <urcu/uatomic.h> | |
23 | ||
24 | #include <common/defaults.h> | |
25 | ||
26 | #include "snapshot.h" | |
53efb85a | 27 | #include "utils.h" |
6dc3064a DG |
28 | |
29 | /* | |
30 | * Return the atomically incremented value of next_output_id. | |
31 | */ | |
32 | static inline unsigned long get_next_output_id(struct snapshot *snapshot) | |
33 | { | |
34 | return uatomic_add_return(&snapshot->next_output_id, 1); | |
35 | } | |
36 | ||
37 | /* | |
5288612f | 38 | * Initialized snapshot output with the given values. |
6dc3064a DG |
39 | * |
40 | * Return 0 on success or else a negative value. | |
41 | */ | |
b178f53e JG |
42 | static int output_init(const struct ltt_session *session, |
43 | uint64_t max_size, const char *name, | |
5288612f | 44 | struct lttng_uri *uris, size_t nb_uri, |
6dc3064a DG |
45 | struct consumer_output *consumer, struct snapshot_output *output, |
46 | struct snapshot *snapshot) | |
47 | { | |
5288612f | 48 | int ret = 0, i; |
6dc3064a | 49 | |
d4b5a90c DG |
50 | memset(output, 0, sizeof(struct snapshot_output)); |
51 | ||
d07ceecd MD |
52 | /* |
53 | * max_size of -1ULL means unset. Set to default (unlimited). | |
54 | */ | |
e1986656 DG |
55 | if (max_size == (uint64_t) -1ULL) { |
56 | max_size = 0; | |
57 | } | |
6dc3064a | 58 | output->max_size = max_size; |
e1986656 | 59 | |
6dc3064a DG |
60 | if (snapshot) { |
61 | output->id = get_next_output_id(snapshot); | |
62 | } | |
63 | lttng_ht_node_init_ulong(&output->node, (unsigned long) output->id); | |
64 | ||
ee91bab2 | 65 | if (name && name[0] != '\0') { |
35f3ec96 MD |
66 | if (lttng_strncpy(output->name, name, sizeof(output->name))) { |
67 | ret = -LTTNG_ERR_INVALID; | |
68 | goto error; | |
69 | } | |
6dc3064a DG |
70 | } else { |
71 | /* Set default name. */ | |
72 | ret = snprintf(output->name, sizeof(output->name), "%s-%" PRIu32, | |
73 | DEFAULT_SNAPSHOT_NAME, output->id); | |
74 | if (ret < 0) { | |
75 | ret = -ENOMEM; | |
76 | goto error; | |
77 | } | |
78 | } | |
79 | ||
80 | if (!consumer) { | |
81 | goto end; | |
82 | } | |
83 | ||
6dc3064a DG |
84 | output->consumer = consumer_copy_output(consumer); |
85 | if (!output->consumer) { | |
86 | ret = -ENOMEM; | |
87 | goto error; | |
88 | } | |
7d2f7452 | 89 | output->consumer->snapshot = 1; |
6dc3064a DG |
90 | |
91 | /* No URL given. */ | |
92 | if (nb_uri == 0) { | |
93 | ret = 0; | |
94 | goto end; | |
95 | } | |
96 | ||
97 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
366a9222 JD |
98 | memset(output->consumer->dst.session_root_path, 0, |
99 | sizeof(output->consumer->dst.session_root_path)); | |
100 | if (lttng_strncpy(output->consumer->dst.session_root_path, | |
35f3ec96 | 101 | uris[0].dst.path, |
366a9222 | 102 | sizeof(output->consumer->dst.session_root_path))) { |
35f3ec96 MD |
103 | ret = -LTTNG_ERR_INVALID; |
104 | goto error; | |
105 | } | |
6dc3064a DG |
106 | output->consumer->type = CONSUMER_DST_LOCAL; |
107 | ret = 0; | |
108 | goto end; | |
109 | } | |
110 | ||
111 | if (nb_uri != 2) { | |
112 | /* Absolutely needs two URIs for network. */ | |
113 | ret = -LTTNG_ERR_INVALID; | |
114 | goto error; | |
115 | } | |
116 | ||
117 | for (i = 0; i < nb_uri; i ++) { | |
118 | /* Network URIs */ | |
b178f53e JG |
119 | ret = consumer_set_network_uri(session, output->consumer, |
120 | &uris[i]); | |
6dc3064a DG |
121 | if (ret < 0) { |
122 | goto error; | |
123 | } | |
124 | } | |
125 | ||
126 | error: | |
127 | end: | |
5288612f DG |
128 | return ret; |
129 | } | |
130 | ||
131 | /* | |
132 | * Initialize a snapshot output object using the given parameters and URI(s). | |
133 | * The name value and uris can be NULL. | |
134 | * | |
135 | * Return 0 on success or else a negative value. | |
136 | */ | |
b178f53e JG |
137 | int snapshot_output_init_with_uri(const struct ltt_session *session, |
138 | uint64_t max_size, const char *name, | |
5288612f DG |
139 | struct lttng_uri *uris, size_t nb_uri, |
140 | struct consumer_output *consumer, struct snapshot_output *output, | |
141 | struct snapshot *snapshot) | |
142 | { | |
b178f53e JG |
143 | return output_init(session, max_size, name, uris, nb_uri, consumer, |
144 | output, snapshot); | |
5288612f DG |
145 | } |
146 | ||
147 | /* | |
148 | * Initialize a snapshot output object using the given parameters. The name | |
149 | * value and url can be NULL. | |
150 | * | |
151 | * Return 0 on success or else a negative value. | |
152 | */ | |
b178f53e JG |
153 | int snapshot_output_init(const struct ltt_session *session, |
154 | uint64_t max_size, const char *name, | |
5288612f DG |
155 | const char *ctrl_url, const char *data_url, |
156 | struct consumer_output *consumer, struct snapshot_output *output, | |
157 | struct snapshot *snapshot) | |
158 | { | |
159 | int ret = 0, nb_uri; | |
160 | struct lttng_uri *uris = NULL; | |
161 | ||
162 | /* Create an array of URIs from URLs. */ | |
163 | nb_uri = uri_parse_str_urls(ctrl_url, data_url, &uris); | |
164 | if (nb_uri < 0) { | |
165 | ret = nb_uri; | |
166 | goto error; | |
167 | } | |
168 | ||
b178f53e JG |
169 | ret = output_init(session, max_size, name, uris, nb_uri, consumer, |
170 | output, snapshot); | |
5288612f DG |
171 | |
172 | error: | |
6dc3064a DG |
173 | free(uris); |
174 | return ret; | |
175 | } | |
176 | ||
177 | struct snapshot_output *snapshot_output_alloc(void) | |
178 | { | |
179 | return zmalloc(sizeof(struct snapshot_output)); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Delete output from the snapshot object. | |
184 | */ | |
185 | void snapshot_delete_output(struct snapshot *snapshot, | |
186 | struct snapshot_output *output) | |
187 | { | |
188 | int ret; | |
189 | struct lttng_ht_iter iter; | |
190 | ||
191 | assert(snapshot); | |
192 | assert(snapshot->output_ht); | |
193 | assert(output); | |
194 | ||
195 | iter.iter.node = &output->node.node; | |
196 | rcu_read_lock(); | |
197 | ret = lttng_ht_del(snapshot->output_ht, &iter); | |
198 | rcu_read_unlock(); | |
199 | assert(!ret); | |
200 | /* | |
201 | * This is safe because the ownership of a snapshot object is in a session | |
202 | * for which the session lock need to be acquired to read and modify it. | |
203 | */ | |
204 | snapshot->nb_output--; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Add output object to the snapshot. | |
209 | */ | |
210 | void snapshot_add_output(struct snapshot *snapshot, | |
211 | struct snapshot_output *output) | |
212 | { | |
213 | assert(snapshot); | |
214 | assert(snapshot->output_ht); | |
215 | assert(output); | |
216 | ||
217 | rcu_read_lock(); | |
218 | lttng_ht_add_unique_ulong(snapshot->output_ht, &output->node); | |
219 | rcu_read_unlock(); | |
220 | /* | |
221 | * This is safe because the ownership of a snapshot object is in a session | |
222 | * for which the session lock need to be acquired to read and modify it. | |
223 | */ | |
224 | snapshot->nb_output++; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Destroy and free a snapshot output object. | |
229 | */ | |
230 | void snapshot_output_destroy(struct snapshot_output *obj) | |
231 | { | |
232 | assert(obj); | |
233 | ||
234 | if (obj->consumer) { | |
235 | consumer_output_send_destroy_relayd(obj->consumer); | |
6addfa37 | 236 | consumer_output_put(obj->consumer); |
6dc3064a DG |
237 | } |
238 | free(obj); | |
239 | } | |
240 | ||
eb240553 DG |
241 | /* |
242 | * RCU read side lock MUST be acquired before calling this since the returned | |
243 | * pointer is in a RCU hash table. | |
244 | * | |
245 | * Return the reference on success or else NULL. | |
246 | */ | |
247 | struct snapshot_output *snapshot_find_output_by_name(const char *name, | |
248 | struct snapshot *snapshot) | |
249 | { | |
250 | struct lttng_ht_iter iter; | |
251 | struct snapshot_output *output = NULL; | |
252 | ||
253 | assert(snapshot); | |
254 | assert(name); | |
255 | ||
256 | cds_lfht_for_each_entry(snapshot->output_ht->ht, &iter.iter, output, | |
257 | node.node) { | |
258 | if (!strncmp(output->name, name, strlen(name))) { | |
259 | return output; | |
260 | } | |
261 | } | |
262 | ||
263 | /* Not found */ | |
264 | return NULL; | |
265 | } | |
266 | ||
6dc3064a DG |
267 | /* |
268 | * RCU read side lock MUST be acquired before calling this since the returned | |
269 | * pointer is in a RCU hash table. | |
270 | * | |
271 | * Return the reference on success or else NULL. | |
272 | */ | |
273 | struct snapshot_output *snapshot_find_output_by_id(uint32_t id, | |
274 | struct snapshot *snapshot) | |
275 | { | |
276 | struct lttng_ht_node_ulong *node; | |
277 | struct lttng_ht_iter iter; | |
278 | struct snapshot_output *output = NULL; | |
279 | ||
280 | assert(snapshot); | |
281 | ||
282 | lttng_ht_lookup(snapshot->output_ht, (void *)((unsigned long) id), &iter); | |
283 | node = lttng_ht_iter_get_node_ulong(&iter); | |
284 | if (!node) { | |
285 | DBG3("Snapshot output not found with id %" PRId32, id); | |
286 | goto error; | |
287 | } | |
288 | output = caa_container_of(node, struct snapshot_output, node); | |
289 | ||
290 | error: | |
291 | return output; | |
292 | } | |
293 | ||
6dc3064a DG |
294 | /* |
295 | * Initialized a snapshot object that was already allocated. | |
296 | * | |
297 | * Return 0 on success or else a negative errno value. | |
298 | */ | |
299 | int snapshot_init(struct snapshot *obj) | |
300 | { | |
301 | int ret; | |
302 | ||
303 | assert(obj); | |
304 | ||
305 | memset(obj, 0, sizeof(struct snapshot)); | |
306 | ||
307 | obj->output_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
308 | if (!obj->output_ht) { | |
309 | ret = -ENOMEM; | |
310 | goto error; | |
311 | } | |
312 | ||
313 | ret = 0; | |
314 | ||
315 | error: | |
316 | return ret; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Destroy snapshot object but the pointer is not freed so it's safe to pass a | |
321 | * static reference. | |
322 | */ | |
323 | void snapshot_destroy(struct snapshot *obj) | |
324 | { | |
325 | struct lttng_ht_iter iter; | |
326 | struct snapshot_output *output; | |
327 | ||
f4cc5e83 JG |
328 | if (!obj->output_ht) { |
329 | return; | |
330 | } | |
6dc3064a DG |
331 | |
332 | rcu_read_lock(); | |
333 | cds_lfht_for_each_entry(obj->output_ht->ht, &iter.iter, output, | |
334 | node.node) { | |
335 | snapshot_delete_output(obj, output); | |
336 | snapshot_output_destroy(output); | |
337 | } | |
338 | rcu_read_unlock(); | |
53efb85a | 339 | ht_cleanup_push(obj->output_ht); |
6dc3064a | 340 | } |