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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 | ||
18 | #define _GNU_SOURCE | |
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 | */ | |
5288612f DG |
42 | static int output_init(uint64_t max_size, const char *name, |
43 | struct lttng_uri *uris, size_t nb_uri, | |
6dc3064a DG |
44 | struct consumer_output *consumer, struct snapshot_output *output, |
45 | struct snapshot *snapshot) | |
46 | { | |
5288612f | 47 | int ret = 0, i; |
6dc3064a DG |
48 | |
49 | assert(output); | |
50 | ||
d4b5a90c DG |
51 | memset(output, 0, sizeof(struct snapshot_output)); |
52 | ||
e1986656 DG |
53 | if (max_size == (uint64_t) -1ULL) { |
54 | max_size = 0; | |
55 | } | |
6dc3064a | 56 | output->max_size = max_size; |
e1986656 | 57 | |
6dc3064a DG |
58 | if (snapshot) { |
59 | output->id = get_next_output_id(snapshot); | |
60 | } | |
61 | lttng_ht_node_init_ulong(&output->node, (unsigned long) output->id); | |
62 | ||
ee91bab2 | 63 | if (name && name[0] != '\0') { |
6dc3064a DG |
64 | strncpy(output->name, name, sizeof(output->name)); |
65 | } else { | |
66 | /* Set default name. */ | |
67 | ret = snprintf(output->name, sizeof(output->name), "%s-%" PRIu32, | |
68 | DEFAULT_SNAPSHOT_NAME, output->id); | |
69 | if (ret < 0) { | |
70 | ret = -ENOMEM; | |
71 | goto error; | |
72 | } | |
73 | } | |
74 | ||
75 | if (!consumer) { | |
76 | goto end; | |
77 | } | |
78 | ||
6dc3064a DG |
79 | output->consumer = consumer_copy_output(consumer); |
80 | if (!output->consumer) { | |
81 | ret = -ENOMEM; | |
82 | goto error; | |
83 | } | |
7d2f7452 | 84 | output->consumer->snapshot = 1; |
6dc3064a DG |
85 | |
86 | /* No URL given. */ | |
87 | if (nb_uri == 0) { | |
88 | ret = 0; | |
89 | goto end; | |
90 | } | |
91 | ||
92 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
93 | memset(output->consumer->dst.trace_path, 0, | |
94 | sizeof(output->consumer->dst.trace_path)); | |
95 | strncpy(output->consumer->dst.trace_path, uris[0].dst.path, | |
96 | sizeof(output->consumer->dst.trace_path)); | |
97 | output->consumer->type = CONSUMER_DST_LOCAL; | |
98 | ret = 0; | |
99 | goto end; | |
100 | } | |
101 | ||
102 | if (nb_uri != 2) { | |
103 | /* Absolutely needs two URIs for network. */ | |
104 | ret = -LTTNG_ERR_INVALID; | |
105 | goto error; | |
106 | } | |
107 | ||
108 | for (i = 0; i < nb_uri; i ++) { | |
109 | /* Network URIs */ | |
110 | ret = consumer_set_network_uri(output->consumer, &uris[i]); | |
111 | if (ret < 0) { | |
112 | goto error; | |
113 | } | |
114 | } | |
115 | ||
116 | error: | |
117 | end: | |
5288612f DG |
118 | return ret; |
119 | } | |
120 | ||
121 | /* | |
122 | * Initialize a snapshot output object using the given parameters and URI(s). | |
123 | * The name value and uris can be NULL. | |
124 | * | |
125 | * Return 0 on success or else a negative value. | |
126 | */ | |
127 | int snapshot_output_init_with_uri(uint64_t max_size, const char *name, | |
128 | struct lttng_uri *uris, size_t nb_uri, | |
129 | struct consumer_output *consumer, struct snapshot_output *output, | |
130 | struct snapshot *snapshot) | |
131 | { | |
132 | return output_init(max_size, name, uris, nb_uri, consumer, output, | |
133 | snapshot); | |
134 | } | |
135 | ||
136 | /* | |
137 | * Initialize a snapshot output object using the given parameters. The name | |
138 | * value and url can be NULL. | |
139 | * | |
140 | * Return 0 on success or else a negative value. | |
141 | */ | |
142 | int snapshot_output_init(uint64_t max_size, const char *name, | |
143 | const char *ctrl_url, const char *data_url, | |
144 | struct consumer_output *consumer, struct snapshot_output *output, | |
145 | struct snapshot *snapshot) | |
146 | { | |
147 | int ret = 0, nb_uri; | |
148 | struct lttng_uri *uris = NULL; | |
149 | ||
150 | /* Create an array of URIs from URLs. */ | |
151 | nb_uri = uri_parse_str_urls(ctrl_url, data_url, &uris); | |
152 | if (nb_uri < 0) { | |
153 | ret = nb_uri; | |
154 | goto error; | |
155 | } | |
156 | ||
157 | ret = output_init(max_size, name, uris, nb_uri, consumer, output, | |
158 | snapshot); | |
159 | ||
160 | error: | |
6dc3064a DG |
161 | free(uris); |
162 | return ret; | |
163 | } | |
164 | ||
165 | struct snapshot_output *snapshot_output_alloc(void) | |
166 | { | |
167 | return zmalloc(sizeof(struct snapshot_output)); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Delete output from the snapshot object. | |
172 | */ | |
173 | void snapshot_delete_output(struct snapshot *snapshot, | |
174 | struct snapshot_output *output) | |
175 | { | |
176 | int ret; | |
177 | struct lttng_ht_iter iter; | |
178 | ||
179 | assert(snapshot); | |
180 | assert(snapshot->output_ht); | |
181 | assert(output); | |
182 | ||
183 | iter.iter.node = &output->node.node; | |
184 | rcu_read_lock(); | |
185 | ret = lttng_ht_del(snapshot->output_ht, &iter); | |
186 | rcu_read_unlock(); | |
187 | assert(!ret); | |
188 | /* | |
189 | * This is safe because the ownership of a snapshot object is in a session | |
190 | * for which the session lock need to be acquired to read and modify it. | |
191 | */ | |
192 | snapshot->nb_output--; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Add output object to the snapshot. | |
197 | */ | |
198 | void snapshot_add_output(struct snapshot *snapshot, | |
199 | struct snapshot_output *output) | |
200 | { | |
201 | assert(snapshot); | |
202 | assert(snapshot->output_ht); | |
203 | assert(output); | |
204 | ||
205 | rcu_read_lock(); | |
206 | lttng_ht_add_unique_ulong(snapshot->output_ht, &output->node); | |
207 | rcu_read_unlock(); | |
208 | /* | |
209 | * This is safe because the ownership of a snapshot object is in a session | |
210 | * for which the session lock need to be acquired to read and modify it. | |
211 | */ | |
212 | snapshot->nb_output++; | |
213 | } | |
214 | ||
215 | /* | |
216 | * Destroy and free a snapshot output object. | |
217 | */ | |
218 | void snapshot_output_destroy(struct snapshot_output *obj) | |
219 | { | |
220 | assert(obj); | |
221 | ||
222 | if (obj->consumer) { | |
223 | consumer_output_send_destroy_relayd(obj->consumer); | |
224 | consumer_destroy_output(obj->consumer); | |
225 | } | |
226 | free(obj); | |
227 | } | |
228 | ||
eb240553 DG |
229 | /* |
230 | * RCU read side lock MUST be acquired before calling this since the returned | |
231 | * pointer is in a RCU hash table. | |
232 | * | |
233 | * Return the reference on success or else NULL. | |
234 | */ | |
235 | struct snapshot_output *snapshot_find_output_by_name(const char *name, | |
236 | struct snapshot *snapshot) | |
237 | { | |
238 | struct lttng_ht_iter iter; | |
239 | struct snapshot_output *output = NULL; | |
240 | ||
241 | assert(snapshot); | |
242 | assert(name); | |
243 | ||
244 | cds_lfht_for_each_entry(snapshot->output_ht->ht, &iter.iter, output, | |
245 | node.node) { | |
246 | if (!strncmp(output->name, name, strlen(name))) { | |
247 | return output; | |
248 | } | |
249 | } | |
250 | ||
251 | /* Not found */ | |
252 | return NULL; | |
253 | } | |
254 | ||
6dc3064a DG |
255 | /* |
256 | * RCU read side lock MUST be acquired before calling this since the returned | |
257 | * pointer is in a RCU hash table. | |
258 | * | |
259 | * Return the reference on success or else NULL. | |
260 | */ | |
261 | struct snapshot_output *snapshot_find_output_by_id(uint32_t id, | |
262 | struct snapshot *snapshot) | |
263 | { | |
264 | struct lttng_ht_node_ulong *node; | |
265 | struct lttng_ht_iter iter; | |
266 | struct snapshot_output *output = NULL; | |
267 | ||
268 | assert(snapshot); | |
269 | ||
270 | lttng_ht_lookup(snapshot->output_ht, (void *)((unsigned long) id), &iter); | |
271 | node = lttng_ht_iter_get_node_ulong(&iter); | |
272 | if (!node) { | |
273 | DBG3("Snapshot output not found with id %" PRId32, id); | |
274 | goto error; | |
275 | } | |
276 | output = caa_container_of(node, struct snapshot_output, node); | |
277 | ||
278 | error: | |
279 | return output; | |
280 | } | |
281 | ||
6dc3064a DG |
282 | /* |
283 | * Initialized a snapshot object that was already allocated. | |
284 | * | |
285 | * Return 0 on success or else a negative errno value. | |
286 | */ | |
287 | int snapshot_init(struct snapshot *obj) | |
288 | { | |
289 | int ret; | |
290 | ||
291 | assert(obj); | |
292 | ||
293 | memset(obj, 0, sizeof(struct snapshot)); | |
294 | ||
295 | obj->output_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
296 | if (!obj->output_ht) { | |
297 | ret = -ENOMEM; | |
298 | goto error; | |
299 | } | |
300 | ||
301 | ret = 0; | |
302 | ||
303 | error: | |
304 | return ret; | |
305 | } | |
306 | ||
307 | /* | |
308 | * Destroy snapshot object but the pointer is not freed so it's safe to pass a | |
309 | * static reference. | |
310 | */ | |
311 | void snapshot_destroy(struct snapshot *obj) | |
312 | { | |
313 | struct lttng_ht_iter iter; | |
314 | struct snapshot_output *output; | |
315 | ||
316 | assert(obj); | |
317 | ||
318 | rcu_read_lock(); | |
319 | cds_lfht_for_each_entry(obj->output_ht->ht, &iter.iter, output, | |
320 | node.node) { | |
321 | snapshot_delete_output(obj, output); | |
322 | snapshot_output_destroy(output); | |
323 | } | |
324 | rcu_read_unlock(); | |
53efb85a | 325 | ht_cleanup_push(obj->output_ht); |
6dc3064a | 326 | } |