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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 | /* | |
37 | * Initialize a snapshot output object using the given parameters. The name | |
38 | * value and url can be NULL. | |
39 | * | |
40 | * Return 0 on success or else a negative value. | |
41 | */ | |
42 | int snapshot_output_init(uint64_t max_size, const char *name, | |
43 | const char *ctrl_url, const char *data_url, | |
44 | struct consumer_output *consumer, struct snapshot_output *output, | |
45 | struct snapshot *snapshot) | |
46 | { | |
47 | int ret = 0, nb_uri, i; | |
48 | struct lttng_uri *uris = NULL; | |
49 | ||
50 | assert(output); | |
51 | ||
5eecee74 DG |
52 | DBG2("Snapshot output initializing with max size %" PRIu64 ", name %s " |
53 | "ctrl URL %s, data URL %s", max_size, name, ctrl_url, data_url); | |
54 | ||
6dc3064a DG |
55 | output->max_size = max_size; |
56 | if (snapshot) { | |
57 | output->id = get_next_output_id(snapshot); | |
58 | } | |
59 | lttng_ht_node_init_ulong(&output->node, (unsigned long) output->id); | |
60 | ||
ee91bab2 | 61 | if (name && name[0] != '\0') { |
6dc3064a DG |
62 | strncpy(output->name, name, sizeof(output->name)); |
63 | } else { | |
64 | /* Set default name. */ | |
65 | ret = snprintf(output->name, sizeof(output->name), "%s-%" PRIu32, | |
66 | DEFAULT_SNAPSHOT_NAME, output->id); | |
67 | if (ret < 0) { | |
68 | ret = -ENOMEM; | |
69 | goto error; | |
70 | } | |
71 | } | |
72 | ||
73 | if (!consumer) { | |
74 | goto end; | |
75 | } | |
76 | ||
77 | /* Create an array of URIs from URLs. */ | |
78 | nb_uri = uri_parse_str_urls(ctrl_url, data_url, &uris); | |
79 | if (nb_uri < 0) { | |
80 | ret = nb_uri; | |
81 | goto error; | |
82 | } | |
83 | ||
84 | output->consumer = consumer_copy_output(consumer); | |
85 | if (!output->consumer) { | |
86 | ret = -ENOMEM; | |
87 | goto error; | |
88 | } | |
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) { | |
97 | memset(output->consumer->dst.trace_path, 0, | |
98 | sizeof(output->consumer->dst.trace_path)); | |
99 | strncpy(output->consumer->dst.trace_path, uris[0].dst.path, | |
100 | sizeof(output->consumer->dst.trace_path)); | |
101 | output->consumer->type = CONSUMER_DST_LOCAL; | |
102 | ret = 0; | |
103 | goto end; | |
104 | } | |
105 | ||
106 | if (nb_uri != 2) { | |
107 | /* Absolutely needs two URIs for network. */ | |
108 | ret = -LTTNG_ERR_INVALID; | |
109 | goto error; | |
110 | } | |
111 | ||
112 | for (i = 0; i < nb_uri; i ++) { | |
113 | /* Network URIs */ | |
114 | ret = consumer_set_network_uri(output->consumer, &uris[i]); | |
115 | if (ret < 0) { | |
116 | goto error; | |
117 | } | |
118 | } | |
119 | ||
120 | error: | |
121 | end: | |
122 | free(uris); | |
123 | return ret; | |
124 | } | |
125 | ||
126 | struct snapshot_output *snapshot_output_alloc(void) | |
127 | { | |
128 | return zmalloc(sizeof(struct snapshot_output)); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Delete output from the snapshot object. | |
133 | */ | |
134 | void snapshot_delete_output(struct snapshot *snapshot, | |
135 | struct snapshot_output *output) | |
136 | { | |
137 | int ret; | |
138 | struct lttng_ht_iter iter; | |
139 | ||
140 | assert(snapshot); | |
141 | assert(snapshot->output_ht); | |
142 | assert(output); | |
143 | ||
144 | iter.iter.node = &output->node.node; | |
145 | rcu_read_lock(); | |
146 | ret = lttng_ht_del(snapshot->output_ht, &iter); | |
147 | rcu_read_unlock(); | |
148 | assert(!ret); | |
149 | /* | |
150 | * This is safe because the ownership of a snapshot object is in a session | |
151 | * for which the session lock need to be acquired to read and modify it. | |
152 | */ | |
153 | snapshot->nb_output--; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Add output object to the snapshot. | |
158 | */ | |
159 | void snapshot_add_output(struct snapshot *snapshot, | |
160 | struct snapshot_output *output) | |
161 | { | |
162 | assert(snapshot); | |
163 | assert(snapshot->output_ht); | |
164 | assert(output); | |
165 | ||
166 | rcu_read_lock(); | |
167 | lttng_ht_add_unique_ulong(snapshot->output_ht, &output->node); | |
168 | rcu_read_unlock(); | |
169 | /* | |
170 | * This is safe because the ownership of a snapshot object is in a session | |
171 | * for which the session lock need to be acquired to read and modify it. | |
172 | */ | |
173 | snapshot->nb_output++; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Destroy and free a snapshot output object. | |
178 | */ | |
179 | void snapshot_output_destroy(struct snapshot_output *obj) | |
180 | { | |
181 | assert(obj); | |
182 | ||
183 | if (obj->consumer) { | |
184 | consumer_output_send_destroy_relayd(obj->consumer); | |
185 | consumer_destroy_output(obj->consumer); | |
186 | } | |
187 | free(obj); | |
188 | } | |
189 | ||
190 | /* | |
191 | * RCU read side lock MUST be acquired before calling this since the returned | |
192 | * pointer is in a RCU hash table. | |
193 | * | |
194 | * Return the reference on success or else NULL. | |
195 | */ | |
196 | struct snapshot_output *snapshot_find_output_by_id(uint32_t id, | |
197 | struct snapshot *snapshot) | |
198 | { | |
199 | struct lttng_ht_node_ulong *node; | |
200 | struct lttng_ht_iter iter; | |
201 | struct snapshot_output *output = NULL; | |
202 | ||
203 | assert(snapshot); | |
204 | ||
205 | lttng_ht_lookup(snapshot->output_ht, (void *)((unsigned long) id), &iter); | |
206 | node = lttng_ht_iter_get_node_ulong(&iter); | |
207 | if (!node) { | |
208 | DBG3("Snapshot output not found with id %" PRId32, id); | |
209 | goto error; | |
210 | } | |
211 | output = caa_container_of(node, struct snapshot_output, node); | |
212 | ||
213 | error: | |
214 | return output; | |
215 | } | |
216 | ||
217 | struct snapshot *snapshot_alloc(void) | |
218 | { | |
219 | return zmalloc(sizeof(struct snapshot)); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Initialized a snapshot object that was already allocated. | |
224 | * | |
225 | * Return 0 on success or else a negative errno value. | |
226 | */ | |
227 | int snapshot_init(struct snapshot *obj) | |
228 | { | |
229 | int ret; | |
230 | ||
231 | assert(obj); | |
232 | ||
233 | memset(obj, 0, sizeof(struct snapshot)); | |
234 | ||
235 | obj->output_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
236 | if (!obj->output_ht) { | |
237 | ret = -ENOMEM; | |
238 | goto error; | |
239 | } | |
240 | ||
241 | ret = 0; | |
242 | ||
243 | error: | |
244 | return ret; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Destroy snapshot object but the pointer is not freed so it's safe to pass a | |
249 | * static reference. | |
250 | */ | |
251 | void snapshot_destroy(struct snapshot *obj) | |
252 | { | |
253 | struct lttng_ht_iter iter; | |
254 | struct snapshot_output *output; | |
255 | ||
256 | assert(obj); | |
257 | ||
258 | rcu_read_lock(); | |
259 | cds_lfht_for_each_entry(obj->output_ht->ht, &iter.iter, output, | |
260 | node.node) { | |
261 | snapshot_delete_output(obj, output); | |
262 | snapshot_output_destroy(output); | |
263 | } | |
264 | rcu_read_unlock(); | |
265 | } |