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