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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 | ||
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 | */ | |
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 | 48 | |
d4b5a90c DG |
49 | memset(output, 0, sizeof(struct snapshot_output)); |
50 | ||
d07ceecd MD |
51 | /* |
52 | * max_size of -1ULL means unset. Set to default (unlimited). | |
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') { |
35f3ec96 MD |
65 | if (lttng_strncpy(output->name, name, sizeof(output->name))) { |
66 | ret = -LTTNG_ERR_INVALID; | |
67 | goto error; | |
68 | } | |
6dc3064a DG |
69 | } else { |
70 | /* Set default name. */ | |
71 | ret = snprintf(output->name, sizeof(output->name), "%s-%" PRIu32, | |
72 | DEFAULT_SNAPSHOT_NAME, output->id); | |
73 | if (ret < 0) { | |
74 | ret = -ENOMEM; | |
75 | goto error; | |
76 | } | |
77 | } | |
78 | ||
79 | if (!consumer) { | |
80 | goto end; | |
81 | } | |
82 | ||
6dc3064a DG |
83 | output->consumer = consumer_copy_output(consumer); |
84 | if (!output->consumer) { | |
85 | ret = -ENOMEM; | |
86 | goto error; | |
87 | } | |
7d2f7452 | 88 | output->consumer->snapshot = 1; |
6dc3064a DG |
89 | |
90 | /* No URL given. */ | |
91 | if (nb_uri == 0) { | |
92 | ret = 0; | |
93 | goto end; | |
94 | } | |
95 | ||
96 | if (uris[0].dtype == LTTNG_DST_PATH) { | |
366a9222 JD |
97 | memset(output->consumer->dst.session_root_path, 0, |
98 | sizeof(output->consumer->dst.session_root_path)); | |
99 | if (lttng_strncpy(output->consumer->dst.session_root_path, | |
35f3ec96 | 100 | uris[0].dst.path, |
366a9222 | 101 | sizeof(output->consumer->dst.session_root_path))) { |
35f3ec96 MD |
102 | ret = -LTTNG_ERR_INVALID; |
103 | goto error; | |
104 | } | |
6dc3064a DG |
105 | output->consumer->type = CONSUMER_DST_LOCAL; |
106 | ret = 0; | |
107 | goto end; | |
108 | } | |
109 | ||
110 | if (nb_uri != 2) { | |
111 | /* Absolutely needs two URIs for network. */ | |
112 | ret = -LTTNG_ERR_INVALID; | |
113 | goto error; | |
114 | } | |
115 | ||
116 | for (i = 0; i < nb_uri; i ++) { | |
117 | /* Network URIs */ | |
118 | ret = consumer_set_network_uri(output->consumer, &uris[i]); | |
119 | if (ret < 0) { | |
120 | goto error; | |
121 | } | |
122 | } | |
123 | ||
124 | error: | |
125 | end: | |
5288612f DG |
126 | return ret; |
127 | } | |
128 | ||
129 | /* | |
130 | * Initialize a snapshot output object using the given parameters and URI(s). | |
131 | * The name value and uris can be NULL. | |
132 | * | |
133 | * Return 0 on success or else a negative value. | |
134 | */ | |
135 | int snapshot_output_init_with_uri(uint64_t max_size, const char *name, | |
136 | struct lttng_uri *uris, size_t nb_uri, | |
137 | struct consumer_output *consumer, struct snapshot_output *output, | |
138 | struct snapshot *snapshot) | |
139 | { | |
140 | return output_init(max_size, name, uris, nb_uri, consumer, output, | |
141 | snapshot); | |
142 | } | |
143 | ||
144 | /* | |
145 | * Initialize a snapshot output object using the given parameters. The name | |
146 | * value and url can be NULL. | |
147 | * | |
148 | * Return 0 on success or else a negative value. | |
149 | */ | |
150 | int snapshot_output_init(uint64_t max_size, const char *name, | |
151 | const char *ctrl_url, const char *data_url, | |
152 | struct consumer_output *consumer, struct snapshot_output *output, | |
153 | struct snapshot *snapshot) | |
154 | { | |
155 | int ret = 0, nb_uri; | |
156 | struct lttng_uri *uris = NULL; | |
157 | ||
158 | /* Create an array of URIs from URLs. */ | |
159 | nb_uri = uri_parse_str_urls(ctrl_url, data_url, &uris); | |
160 | if (nb_uri < 0) { | |
161 | ret = nb_uri; | |
162 | goto error; | |
163 | } | |
164 | ||
165 | ret = output_init(max_size, name, uris, nb_uri, consumer, output, | |
166 | snapshot); | |
167 | ||
168 | error: | |
6dc3064a DG |
169 | free(uris); |
170 | return ret; | |
171 | } | |
172 | ||
173 | struct snapshot_output *snapshot_output_alloc(void) | |
174 | { | |
175 | return zmalloc(sizeof(struct snapshot_output)); | |
176 | } | |
177 | ||
178 | /* | |
179 | * Delete output from the snapshot object. | |
180 | */ | |
181 | void snapshot_delete_output(struct snapshot *snapshot, | |
182 | struct snapshot_output *output) | |
183 | { | |
184 | int ret; | |
185 | struct lttng_ht_iter iter; | |
186 | ||
187 | assert(snapshot); | |
188 | assert(snapshot->output_ht); | |
189 | assert(output); | |
190 | ||
191 | iter.iter.node = &output->node.node; | |
192 | rcu_read_lock(); | |
193 | ret = lttng_ht_del(snapshot->output_ht, &iter); | |
194 | rcu_read_unlock(); | |
195 | assert(!ret); | |
196 | /* | |
197 | * This is safe because the ownership of a snapshot object is in a session | |
198 | * for which the session lock need to be acquired to read and modify it. | |
199 | */ | |
200 | snapshot->nb_output--; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Add output object to the snapshot. | |
205 | */ | |
206 | void snapshot_add_output(struct snapshot *snapshot, | |
207 | struct snapshot_output *output) | |
208 | { | |
209 | assert(snapshot); | |
210 | assert(snapshot->output_ht); | |
211 | assert(output); | |
212 | ||
213 | rcu_read_lock(); | |
214 | lttng_ht_add_unique_ulong(snapshot->output_ht, &output->node); | |
215 | rcu_read_unlock(); | |
216 | /* | |
217 | * This is safe because the ownership of a snapshot object is in a session | |
218 | * for which the session lock need to be acquired to read and modify it. | |
219 | */ | |
220 | snapshot->nb_output++; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Destroy and free a snapshot output object. | |
225 | */ | |
226 | void snapshot_output_destroy(struct snapshot_output *obj) | |
227 | { | |
228 | assert(obj); | |
229 | ||
230 | if (obj->consumer) { | |
231 | consumer_output_send_destroy_relayd(obj->consumer); | |
6addfa37 | 232 | consumer_output_put(obj->consumer); |
6dc3064a DG |
233 | } |
234 | free(obj); | |
235 | } | |
236 | ||
eb240553 DG |
237 | /* |
238 | * RCU read side lock MUST be acquired before calling this since the returned | |
239 | * pointer is in a RCU hash table. | |
240 | * | |
241 | * Return the reference on success or else NULL. | |
242 | */ | |
243 | struct snapshot_output *snapshot_find_output_by_name(const char *name, | |
244 | struct snapshot *snapshot) | |
245 | { | |
246 | struct lttng_ht_iter iter; | |
247 | struct snapshot_output *output = NULL; | |
248 | ||
249 | assert(snapshot); | |
250 | assert(name); | |
251 | ||
252 | cds_lfht_for_each_entry(snapshot->output_ht->ht, &iter.iter, output, | |
253 | node.node) { | |
254 | if (!strncmp(output->name, name, strlen(name))) { | |
255 | return output; | |
256 | } | |
257 | } | |
258 | ||
259 | /* Not found */ | |
260 | return NULL; | |
261 | } | |
262 | ||
6dc3064a DG |
263 | /* |
264 | * RCU read side lock MUST be acquired before calling this since the returned | |
265 | * pointer is in a RCU hash table. | |
266 | * | |
267 | * Return the reference on success or else NULL. | |
268 | */ | |
269 | struct snapshot_output *snapshot_find_output_by_id(uint32_t id, | |
270 | struct snapshot *snapshot) | |
271 | { | |
272 | struct lttng_ht_node_ulong *node; | |
273 | struct lttng_ht_iter iter; | |
274 | struct snapshot_output *output = NULL; | |
275 | ||
276 | assert(snapshot); | |
277 | ||
278 | lttng_ht_lookup(snapshot->output_ht, (void *)((unsigned long) id), &iter); | |
279 | node = lttng_ht_iter_get_node_ulong(&iter); | |
280 | if (!node) { | |
281 | DBG3("Snapshot output not found with id %" PRId32, id); | |
282 | goto error; | |
283 | } | |
284 | output = caa_container_of(node, struct snapshot_output, node); | |
285 | ||
286 | error: | |
287 | return output; | |
288 | } | |
289 | ||
6dc3064a DG |
290 | /* |
291 | * Initialized a snapshot object that was already allocated. | |
292 | * | |
293 | * Return 0 on success or else a negative errno value. | |
294 | */ | |
295 | int snapshot_init(struct snapshot *obj) | |
296 | { | |
297 | int ret; | |
298 | ||
299 | assert(obj); | |
300 | ||
301 | memset(obj, 0, sizeof(struct snapshot)); | |
302 | ||
303 | obj->output_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
304 | if (!obj->output_ht) { | |
305 | ret = -ENOMEM; | |
306 | goto error; | |
307 | } | |
308 | ||
309 | ret = 0; | |
310 | ||
311 | error: | |
312 | return ret; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Destroy snapshot object but the pointer is not freed so it's safe to pass a | |
317 | * static reference. | |
318 | */ | |
319 | void snapshot_destroy(struct snapshot *obj) | |
320 | { | |
321 | struct lttng_ht_iter iter; | |
322 | struct snapshot_output *output; | |
323 | ||
324 | assert(obj); | |
325 | ||
326 | rcu_read_lock(); | |
327 | cds_lfht_for_each_entry(obj->output_ht->ht, &iter.iter, output, | |
328 | node.node) { | |
329 | snapshot_delete_output(obj, output); | |
330 | snapshot_output_destroy(output); | |
331 | } | |
332 | rcu_read_unlock(); | |
53efb85a | 333 | ht_cleanup_push(obj->output_ht); |
6dc3064a | 334 | } |