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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" | |
27 | ||
28 | /* | |
29 | * Return the atomically incremented value of next_output_id. | |
30 | */ | |
31 | static inline unsigned long get_next_output_id(struct snapshot *snapshot) | |
32 | { | |
33 | return uatomic_add_return(&snapshot->next_output_id, 1); | |
34 | } | |
35 | ||
36 | /* | |
5288612f | 37 | * Initialized snapshot output with the given values. |
6dc3064a DG |
38 | * |
39 | * Return 0 on success or else a negative value. | |
40 | */ | |
5288612f DG |
41 | static int output_init(uint64_t max_size, const char *name, |
42 | struct lttng_uri *uris, size_t nb_uri, | |
6dc3064a DG |
43 | struct consumer_output *consumer, struct snapshot_output *output, |
44 | struct snapshot *snapshot) | |
45 | { | |
5288612f | 46 | int ret = 0, i; |
6dc3064a DG |
47 | |
48 | assert(output); | |
49 | ||
d4b5a90c DG |
50 | memset(output, 0, sizeof(struct snapshot_output)); |
51 | ||
e1986656 DG |
52 | if (max_size == (uint64_t) -1ULL) { |
53 | max_size = 0; | |
54 | } | |
6dc3064a | 55 | output->max_size = max_size; |
e1986656 | 56 | |
6dc3064a DG |
57 | if (snapshot) { |
58 | output->id = get_next_output_id(snapshot); | |
59 | } | |
60 | lttng_ht_node_init_ulong(&output->node, (unsigned long) output->id); | |
61 | ||
ee91bab2 | 62 | if (name && name[0] != '\0') { |
6dc3064a DG |
63 | strncpy(output->name, name, sizeof(output->name)); |
64 | } else { | |
65 | /* Set default name. */ | |
66 | ret = snprintf(output->name, sizeof(output->name), "%s-%" PRIu32, | |
67 | DEFAULT_SNAPSHOT_NAME, output->id); | |
68 | if (ret < 0) { | |
69 | ret = -ENOMEM; | |
70 | goto error; | |
71 | } | |
72 | } | |
73 | ||
74 | if (!consumer) { | |
75 | goto end; | |
76 | } | |
77 | ||
6dc3064a DG |
78 | output->consumer = consumer_copy_output(consumer); |
79 | if (!output->consumer) { | |
80 | ret = -ENOMEM; | |
81 | goto error; | |
82 | } | |
83 | ||
84 | /* No URL given. */ | |
85 | if (nb_uri == 0) { | |
86 | ret = 0; | |
87 | goto end; | |
88 | } | |
89 | ||
90 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
91 | memset(output->consumer->dst.trace_path, 0, | |
92 | sizeof(output->consumer->dst.trace_path)); | |
93 | strncpy(output->consumer->dst.trace_path, uris[0].dst.path, | |
94 | sizeof(output->consumer->dst.trace_path)); | |
95 | output->consumer->type = CONSUMER_DST_LOCAL; | |
96 | ret = 0; | |
97 | goto end; | |
98 | } | |
99 | ||
100 | if (nb_uri != 2) { | |
101 | /* Absolutely needs two URIs for network. */ | |
102 | ret = -LTTNG_ERR_INVALID; | |
103 | goto error; | |
104 | } | |
105 | ||
106 | for (i = 0; i < nb_uri; i ++) { | |
107 | /* Network URIs */ | |
108 | ret = consumer_set_network_uri(output->consumer, &uris[i]); | |
109 | if (ret < 0) { | |
110 | goto error; | |
111 | } | |
112 | } | |
113 | ||
114 | error: | |
115 | end: | |
5288612f DG |
116 | return ret; |
117 | } | |
118 | ||
119 | /* | |
120 | * Initialize a snapshot output object using the given parameters and URI(s). | |
121 | * The name value and uris can be NULL. | |
122 | * | |
123 | * Return 0 on success or else a negative value. | |
124 | */ | |
125 | int snapshot_output_init_with_uri(uint64_t max_size, const char *name, | |
126 | struct lttng_uri *uris, size_t nb_uri, | |
127 | struct consumer_output *consumer, struct snapshot_output *output, | |
128 | struct snapshot *snapshot) | |
129 | { | |
130 | return output_init(max_size, name, uris, nb_uri, consumer, output, | |
131 | snapshot); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Initialize a snapshot output object using the given parameters. The name | |
136 | * value and url can be NULL. | |
137 | * | |
138 | * Return 0 on success or else a negative value. | |
139 | */ | |
140 | int snapshot_output_init(uint64_t max_size, const char *name, | |
141 | const char *ctrl_url, const char *data_url, | |
142 | struct consumer_output *consumer, struct snapshot_output *output, | |
143 | struct snapshot *snapshot) | |
144 | { | |
145 | int ret = 0, nb_uri; | |
146 | struct lttng_uri *uris = NULL; | |
147 | ||
148 | /* Create an array of URIs from URLs. */ | |
149 | nb_uri = uri_parse_str_urls(ctrl_url, data_url, &uris); | |
150 | if (nb_uri < 0) { | |
151 | ret = nb_uri; | |
152 | goto error; | |
153 | } | |
154 | ||
155 | ret = output_init(max_size, name, uris, nb_uri, consumer, output, | |
156 | snapshot); | |
157 | ||
158 | error: | |
6dc3064a DG |
159 | free(uris); |
160 | return ret; | |
161 | } | |
162 | ||
163 | struct snapshot_output *snapshot_output_alloc(void) | |
164 | { | |
165 | return zmalloc(sizeof(struct snapshot_output)); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Delete output from the snapshot object. | |
170 | */ | |
171 | void snapshot_delete_output(struct snapshot *snapshot, | |
172 | struct snapshot_output *output) | |
173 | { | |
174 | int ret; | |
175 | struct lttng_ht_iter iter; | |
176 | ||
177 | assert(snapshot); | |
178 | assert(snapshot->output_ht); | |
179 | assert(output); | |
180 | ||
181 | iter.iter.node = &output->node.node; | |
182 | rcu_read_lock(); | |
183 | ret = lttng_ht_del(snapshot->output_ht, &iter); | |
184 | rcu_read_unlock(); | |
185 | assert(!ret); | |
186 | /* | |
187 | * This is safe because the ownership of a snapshot object is in a session | |
188 | * for which the session lock need to be acquired to read and modify it. | |
189 | */ | |
190 | snapshot->nb_output--; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Add output object to the snapshot. | |
195 | */ | |
196 | void snapshot_add_output(struct snapshot *snapshot, | |
197 | struct snapshot_output *output) | |
198 | { | |
199 | assert(snapshot); | |
200 | assert(snapshot->output_ht); | |
201 | assert(output); | |
202 | ||
203 | rcu_read_lock(); | |
204 | lttng_ht_add_unique_ulong(snapshot->output_ht, &output->node); | |
205 | rcu_read_unlock(); | |
206 | /* | |
207 | * This is safe because the ownership of a snapshot object is in a session | |
208 | * for which the session lock need to be acquired to read and modify it. | |
209 | */ | |
210 | snapshot->nb_output++; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Destroy and free a snapshot output object. | |
215 | */ | |
216 | void snapshot_output_destroy(struct snapshot_output *obj) | |
217 | { | |
218 | assert(obj); | |
219 | ||
220 | if (obj->consumer) { | |
221 | consumer_output_send_destroy_relayd(obj->consumer); | |
222 | consumer_destroy_output(obj->consumer); | |
223 | } | |
224 | free(obj); | |
225 | } | |
226 | ||
eb240553 DG |
227 | /* |
228 | * RCU read side lock MUST be acquired before calling this since the returned | |
229 | * pointer is in a RCU hash table. | |
230 | * | |
231 | * Return the reference on success or else NULL. | |
232 | */ | |
233 | struct snapshot_output *snapshot_find_output_by_name(const char *name, | |
234 | struct snapshot *snapshot) | |
235 | { | |
236 | struct lttng_ht_iter iter; | |
237 | struct snapshot_output *output = NULL; | |
238 | ||
239 | assert(snapshot); | |
240 | assert(name); | |
241 | ||
242 | cds_lfht_for_each_entry(snapshot->output_ht->ht, &iter.iter, output, | |
243 | node.node) { | |
244 | if (!strncmp(output->name, name, strlen(name))) { | |
245 | return output; | |
246 | } | |
247 | } | |
248 | ||
249 | /* Not found */ | |
250 | return NULL; | |
251 | } | |
252 | ||
6dc3064a DG |
253 | /* |
254 | * RCU read side lock MUST be acquired before calling this since the returned | |
255 | * pointer is in a RCU hash table. | |
256 | * | |
257 | * Return the reference on success or else NULL. | |
258 | */ | |
259 | struct snapshot_output *snapshot_find_output_by_id(uint32_t id, | |
260 | struct snapshot *snapshot) | |
261 | { | |
262 | struct lttng_ht_node_ulong *node; | |
263 | struct lttng_ht_iter iter; | |
264 | struct snapshot_output *output = NULL; | |
265 | ||
266 | assert(snapshot); | |
267 | ||
268 | lttng_ht_lookup(snapshot->output_ht, (void *)((unsigned long) id), &iter); | |
269 | node = lttng_ht_iter_get_node_ulong(&iter); | |
270 | if (!node) { | |
271 | DBG3("Snapshot output not found with id %" PRId32, id); | |
272 | goto error; | |
273 | } | |
274 | output = caa_container_of(node, struct snapshot_output, node); | |
275 | ||
276 | error: | |
277 | return output; | |
278 | } | |
279 | ||
6dc3064a DG |
280 | /* |
281 | * Initialized a snapshot object that was already allocated. | |
282 | * | |
283 | * Return 0 on success or else a negative errno value. | |
284 | */ | |
285 | int snapshot_init(struct snapshot *obj) | |
286 | { | |
287 | int ret; | |
288 | ||
289 | assert(obj); | |
290 | ||
291 | memset(obj, 0, sizeof(struct snapshot)); | |
292 | ||
293 | obj->output_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
294 | if (!obj->output_ht) { | |
295 | ret = -ENOMEM; | |
296 | goto error; | |
297 | } | |
298 | ||
299 | ret = 0; | |
300 | ||
301 | error: | |
302 | return ret; | |
303 | } | |
304 | ||
305 | /* | |
306 | * Destroy snapshot object but the pointer is not freed so it's safe to pass a | |
307 | * static reference. | |
308 | */ | |
309 | void snapshot_destroy(struct snapshot *obj) | |
310 | { | |
311 | struct lttng_ht_iter iter; | |
312 | struct snapshot_output *output; | |
313 | ||
314 | assert(obj); | |
315 | ||
316 | rcu_read_lock(); | |
317 | cds_lfht_for_each_entry(obj->output_ht->ht, &iter.iter, output, | |
318 | node.node) { | |
319 | snapshot_delete_output(obj, output); | |
320 | snapshot_output_destroy(output); | |
321 | } | |
322 | rcu_read_unlock(); | |
323 | } |