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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 | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
6dc3064a DG |
20 | #include <assert.h> |
21 | #include <inttypes.h> | |
22 | #include <string.h> | |
23 | #include <urcu/uatomic.h> | |
24 | ||
25 | #include <common/defaults.h> | |
26 | ||
27 | #include "snapshot.h" | |
53efb85a | 28 | #include "utils.h" |
6dc3064a DG |
29 | |
30 | /* | |
31 | * Return the atomically incremented value of next_output_id. | |
32 | */ | |
33 | static inline unsigned long get_next_output_id(struct snapshot *snapshot) | |
34 | { | |
35 | return uatomic_add_return(&snapshot->next_output_id, 1); | |
36 | } | |
37 | ||
38 | /* | |
5288612f | 39 | * Initialized snapshot output with the given values. |
6dc3064a DG |
40 | * |
41 | * Return 0 on success or else a negative value. | |
42 | */ | |
5288612f DG |
43 | static int output_init(uint64_t max_size, const char *name, |
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 DG |
49 | |
50 | assert(output); | |
51 | ||
d4b5a90c DG |
52 | memset(output, 0, sizeof(struct snapshot_output)); |
53 | ||
e1986656 DG |
54 | if (max_size == (uint64_t) -1ULL) { |
55 | max_size = 0; | |
56 | } | |
6dc3064a | 57 | output->max_size = max_size; |
e1986656 | 58 | |
6dc3064a DG |
59 | if (snapshot) { |
60 | output->id = get_next_output_id(snapshot); | |
61 | } | |
62 | lttng_ht_node_init_ulong(&output->node, (unsigned long) output->id); | |
63 | ||
ee91bab2 | 64 | if (name && name[0] != '\0') { |
6dc3064a DG |
65 | strncpy(output->name, name, sizeof(output->name)); |
66 | } else { | |
67 | /* Set default name. */ | |
68 | ret = snprintf(output->name, sizeof(output->name), "%s-%" PRIu32, | |
69 | DEFAULT_SNAPSHOT_NAME, output->id); | |
70 | if (ret < 0) { | |
71 | ret = -ENOMEM; | |
72 | goto error; | |
73 | } | |
74 | } | |
75 | ||
76 | if (!consumer) { | |
77 | goto end; | |
78 | } | |
79 | ||
6dc3064a DG |
80 | output->consumer = consumer_copy_output(consumer); |
81 | if (!output->consumer) { | |
82 | ret = -ENOMEM; | |
83 | goto error; | |
84 | } | |
7d2f7452 | 85 | output->consumer->snapshot = 1; |
6dc3064a DG |
86 | |
87 | /* No URL given. */ | |
88 | if (nb_uri == 0) { | |
89 | ret = 0; | |
90 | goto end; | |
91 | } | |
92 | ||
93 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
94 | memset(output->consumer->dst.trace_path, 0, | |
95 | sizeof(output->consumer->dst.trace_path)); | |
96 | strncpy(output->consumer->dst.trace_path, uris[0].dst.path, | |
97 | sizeof(output->consumer->dst.trace_path)); | |
98 | output->consumer->type = CONSUMER_DST_LOCAL; | |
99 | ret = 0; | |
100 | goto end; | |
101 | } | |
102 | ||
103 | if (nb_uri != 2) { | |
104 | /* Absolutely needs two URIs for network. */ | |
105 | ret = -LTTNG_ERR_INVALID; | |
106 | goto error; | |
107 | } | |
108 | ||
109 | for (i = 0; i < nb_uri; i ++) { | |
110 | /* Network URIs */ | |
111 | ret = consumer_set_network_uri(output->consumer, &uris[i]); | |
112 | if (ret < 0) { | |
113 | goto error; | |
114 | } | |
115 | } | |
116 | ||
117 | error: | |
118 | end: | |
5288612f DG |
119 | return ret; |
120 | } | |
121 | ||
122 | /* | |
123 | * Initialize a snapshot output object using the given parameters and URI(s). | |
124 | * The name value and uris can be NULL. | |
125 | * | |
126 | * Return 0 on success or else a negative value. | |
127 | */ | |
128 | int snapshot_output_init_with_uri(uint64_t max_size, const char *name, | |
129 | struct lttng_uri *uris, size_t nb_uri, | |
130 | struct consumer_output *consumer, struct snapshot_output *output, | |
131 | struct snapshot *snapshot) | |
132 | { | |
133 | return output_init(max_size, name, uris, nb_uri, consumer, output, | |
134 | snapshot); | |
135 | } | |
136 | ||
137 | /* | |
138 | * Initialize a snapshot output object using the given parameters. The name | |
139 | * value and url can be NULL. | |
140 | * | |
141 | * Return 0 on success or else a negative value. | |
142 | */ | |
143 | int snapshot_output_init(uint64_t max_size, const char *name, | |
144 | const char *ctrl_url, const char *data_url, | |
145 | struct consumer_output *consumer, struct snapshot_output *output, | |
146 | struct snapshot *snapshot) | |
147 | { | |
148 | int ret = 0, nb_uri; | |
149 | struct lttng_uri *uris = NULL; | |
150 | ||
151 | /* Create an array of URIs from URLs. */ | |
152 | nb_uri = uri_parse_str_urls(ctrl_url, data_url, &uris); | |
153 | if (nb_uri < 0) { | |
154 | ret = nb_uri; | |
155 | goto error; | |
156 | } | |
157 | ||
158 | ret = output_init(max_size, name, uris, nb_uri, consumer, output, | |
159 | snapshot); | |
160 | ||
161 | error: | |
6dc3064a DG |
162 | free(uris); |
163 | return ret; | |
164 | } | |
165 | ||
166 | struct snapshot_output *snapshot_output_alloc(void) | |
167 | { | |
168 | return zmalloc(sizeof(struct snapshot_output)); | |
169 | } | |
170 | ||
171 | /* | |
172 | * Delete output from the snapshot object. | |
173 | */ | |
174 | void snapshot_delete_output(struct snapshot *snapshot, | |
175 | struct snapshot_output *output) | |
176 | { | |
177 | int ret; | |
178 | struct lttng_ht_iter iter; | |
179 | ||
180 | assert(snapshot); | |
181 | assert(snapshot->output_ht); | |
182 | assert(output); | |
183 | ||
184 | iter.iter.node = &output->node.node; | |
185 | rcu_read_lock(); | |
186 | ret = lttng_ht_del(snapshot->output_ht, &iter); | |
187 | rcu_read_unlock(); | |
188 | assert(!ret); | |
189 | /* | |
190 | * This is safe because the ownership of a snapshot object is in a session | |
191 | * for which the session lock need to be acquired to read and modify it. | |
192 | */ | |
193 | snapshot->nb_output--; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Add output object to the snapshot. | |
198 | */ | |
199 | void snapshot_add_output(struct snapshot *snapshot, | |
200 | struct snapshot_output *output) | |
201 | { | |
202 | assert(snapshot); | |
203 | assert(snapshot->output_ht); | |
204 | assert(output); | |
205 | ||
206 | rcu_read_lock(); | |
207 | lttng_ht_add_unique_ulong(snapshot->output_ht, &output->node); | |
208 | rcu_read_unlock(); | |
209 | /* | |
210 | * This is safe because the ownership of a snapshot object is in a session | |
211 | * for which the session lock need to be acquired to read and modify it. | |
212 | */ | |
213 | snapshot->nb_output++; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Destroy and free a snapshot output object. | |
218 | */ | |
219 | void snapshot_output_destroy(struct snapshot_output *obj) | |
220 | { | |
221 | assert(obj); | |
222 | ||
223 | if (obj->consumer) { | |
224 | consumer_output_send_destroy_relayd(obj->consumer); | |
225 | consumer_destroy_output(obj->consumer); | |
226 | } | |
227 | free(obj); | |
228 | } | |
229 | ||
eb240553 DG |
230 | /* |
231 | * RCU read side lock MUST be acquired before calling this since the returned | |
232 | * pointer is in a RCU hash table. | |
233 | * | |
234 | * Return the reference on success or else NULL. | |
235 | */ | |
236 | struct snapshot_output *snapshot_find_output_by_name(const char *name, | |
237 | struct snapshot *snapshot) | |
238 | { | |
239 | struct lttng_ht_iter iter; | |
240 | struct snapshot_output *output = NULL; | |
241 | ||
242 | assert(snapshot); | |
243 | assert(name); | |
244 | ||
245 | cds_lfht_for_each_entry(snapshot->output_ht->ht, &iter.iter, output, | |
246 | node.node) { | |
247 | if (!strncmp(output->name, name, strlen(name))) { | |
248 | return output; | |
249 | } | |
250 | } | |
251 | ||
252 | /* Not found */ | |
253 | return NULL; | |
254 | } | |
255 | ||
6dc3064a DG |
256 | /* |
257 | * RCU read side lock MUST be acquired before calling this since the returned | |
258 | * pointer is in a RCU hash table. | |
259 | * | |
260 | * Return the reference on success or else NULL. | |
261 | */ | |
262 | struct snapshot_output *snapshot_find_output_by_id(uint32_t id, | |
263 | struct snapshot *snapshot) | |
264 | { | |
265 | struct lttng_ht_node_ulong *node; | |
266 | struct lttng_ht_iter iter; | |
267 | struct snapshot_output *output = NULL; | |
268 | ||
269 | assert(snapshot); | |
270 | ||
271 | lttng_ht_lookup(snapshot->output_ht, (void *)((unsigned long) id), &iter); | |
272 | node = lttng_ht_iter_get_node_ulong(&iter); | |
273 | if (!node) { | |
274 | DBG3("Snapshot output not found with id %" PRId32, id); | |
275 | goto error; | |
276 | } | |
277 | output = caa_container_of(node, struct snapshot_output, node); | |
278 | ||
279 | error: | |
280 | return output; | |
281 | } | |
282 | ||
6dc3064a DG |
283 | /* |
284 | * Initialized a snapshot object that was already allocated. | |
285 | * | |
286 | * Return 0 on success or else a negative errno value. | |
287 | */ | |
288 | int snapshot_init(struct snapshot *obj) | |
289 | { | |
290 | int ret; | |
291 | ||
292 | assert(obj); | |
293 | ||
294 | memset(obj, 0, sizeof(struct snapshot)); | |
295 | ||
296 | obj->output_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
297 | if (!obj->output_ht) { | |
298 | ret = -ENOMEM; | |
299 | goto error; | |
300 | } | |
301 | ||
302 | ret = 0; | |
303 | ||
304 | error: | |
305 | return ret; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Destroy snapshot object but the pointer is not freed so it's safe to pass a | |
310 | * static reference. | |
311 | */ | |
312 | void snapshot_destroy(struct snapshot *obj) | |
313 | { | |
314 | struct lttng_ht_iter iter; | |
315 | struct snapshot_output *output; | |
316 | ||
317 | assert(obj); | |
318 | ||
319 | rcu_read_lock(); | |
320 | cds_lfht_for_each_entry(obj->output_ht->ht, &iter.iter, output, | |
321 | node.node) { | |
322 | snapshot_delete_output(obj, output); | |
323 | snapshot_output_destroy(output); | |
324 | } | |
325 | rcu_read_unlock(); | |
53efb85a | 326 | ht_cleanup_push(obj->output_ht); |
6dc3064a | 327 | } |