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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 | ||
52 | output->max_size = max_size; | |
53 | if (snapshot) { | |
54 | output->id = get_next_output_id(snapshot); | |
55 | } | |
56 | lttng_ht_node_init_ulong(&output->node, (unsigned long) output->id); | |
57 | ||
58 | if (name) { | |
59 | strncpy(output->name, name, sizeof(output->name)); | |
60 | } else { | |
61 | /* Set default name. */ | |
62 | ret = snprintf(output->name, sizeof(output->name), "%s-%" PRIu32, | |
63 | DEFAULT_SNAPSHOT_NAME, output->id); | |
64 | if (ret < 0) { | |
65 | ret = -ENOMEM; | |
66 | goto error; | |
67 | } | |
68 | } | |
69 | ||
70 | if (!consumer) { | |
71 | goto end; | |
72 | } | |
73 | ||
74 | /* Create an array of URIs from URLs. */ | |
75 | nb_uri = uri_parse_str_urls(ctrl_url, data_url, &uris); | |
76 | if (nb_uri < 0) { | |
77 | ret = nb_uri; | |
78 | goto error; | |
79 | } | |
80 | ||
81 | output->consumer = consumer_copy_output(consumer); | |
82 | if (!output->consumer) { | |
83 | ret = -ENOMEM; | |
84 | goto error; | |
85 | } | |
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: | |
119 | free(uris); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | struct snapshot_output *snapshot_output_alloc(void) | |
124 | { | |
125 | return zmalloc(sizeof(struct snapshot_output)); | |
126 | } | |
127 | ||
128 | /* | |
129 | * Delete output from the snapshot object. | |
130 | */ | |
131 | void snapshot_delete_output(struct snapshot *snapshot, | |
132 | struct snapshot_output *output) | |
133 | { | |
134 | int ret; | |
135 | struct lttng_ht_iter iter; | |
136 | ||
137 | assert(snapshot); | |
138 | assert(snapshot->output_ht); | |
139 | assert(output); | |
140 | ||
141 | iter.iter.node = &output->node.node; | |
142 | rcu_read_lock(); | |
143 | ret = lttng_ht_del(snapshot->output_ht, &iter); | |
144 | rcu_read_unlock(); | |
145 | assert(!ret); | |
146 | /* | |
147 | * This is safe because the ownership of a snapshot object is in a session | |
148 | * for which the session lock need to be acquired to read and modify it. | |
149 | */ | |
150 | snapshot->nb_output--; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Add output object to the snapshot. | |
155 | */ | |
156 | void snapshot_add_output(struct snapshot *snapshot, | |
157 | struct snapshot_output *output) | |
158 | { | |
159 | assert(snapshot); | |
160 | assert(snapshot->output_ht); | |
161 | assert(output); | |
162 | ||
163 | rcu_read_lock(); | |
164 | lttng_ht_add_unique_ulong(snapshot->output_ht, &output->node); | |
165 | rcu_read_unlock(); | |
166 | /* | |
167 | * This is safe because the ownership of a snapshot object is in a session | |
168 | * for which the session lock need to be acquired to read and modify it. | |
169 | */ | |
170 | snapshot->nb_output++; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Destroy and free a snapshot output object. | |
175 | */ | |
176 | void snapshot_output_destroy(struct snapshot_output *obj) | |
177 | { | |
178 | assert(obj); | |
179 | ||
180 | if (obj->consumer) { | |
181 | consumer_output_send_destroy_relayd(obj->consumer); | |
182 | consumer_destroy_output(obj->consumer); | |
183 | } | |
184 | free(obj); | |
185 | } | |
186 | ||
187 | /* | |
188 | * RCU read side lock MUST be acquired before calling this since the returned | |
189 | * pointer is in a RCU hash table. | |
190 | * | |
191 | * Return the reference on success or else NULL. | |
192 | */ | |
193 | struct snapshot_output *snapshot_find_output_by_id(uint32_t id, | |
194 | struct snapshot *snapshot) | |
195 | { | |
196 | struct lttng_ht_node_ulong *node; | |
197 | struct lttng_ht_iter iter; | |
198 | struct snapshot_output *output = NULL; | |
199 | ||
200 | assert(snapshot); | |
201 | ||
202 | lttng_ht_lookup(snapshot->output_ht, (void *)((unsigned long) id), &iter); | |
203 | node = lttng_ht_iter_get_node_ulong(&iter); | |
204 | if (!node) { | |
205 | DBG3("Snapshot output not found with id %" PRId32, id); | |
206 | goto error; | |
207 | } | |
208 | output = caa_container_of(node, struct snapshot_output, node); | |
209 | ||
210 | error: | |
211 | return output; | |
212 | } | |
213 | ||
214 | struct snapshot *snapshot_alloc(void) | |
215 | { | |
216 | return zmalloc(sizeof(struct snapshot)); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Initialized a snapshot object that was already allocated. | |
221 | * | |
222 | * Return 0 on success or else a negative errno value. | |
223 | */ | |
224 | int snapshot_init(struct snapshot *obj) | |
225 | { | |
226 | int ret; | |
227 | ||
228 | assert(obj); | |
229 | ||
230 | memset(obj, 0, sizeof(struct snapshot)); | |
231 | ||
232 | obj->output_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
233 | if (!obj->output_ht) { | |
234 | ret = -ENOMEM; | |
235 | goto error; | |
236 | } | |
237 | ||
238 | ret = 0; | |
239 | ||
240 | error: | |
241 | return ret; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Destroy snapshot object but the pointer is not freed so it's safe to pass a | |
246 | * static reference. | |
247 | */ | |
248 | void snapshot_destroy(struct snapshot *obj) | |
249 | { | |
250 | struct lttng_ht_iter iter; | |
251 | struct snapshot_output *output; | |
252 | ||
253 | assert(obj); | |
254 | ||
255 | rcu_read_lock(); | |
256 | cds_lfht_for_each_entry(obj->output_ht->ht, &iter.iter, output, | |
257 | node.node) { | |
258 | snapshot_delete_output(obj, output); | |
259 | snapshot_output_destroy(output); | |
260 | } | |
261 | rcu_read_unlock(); | |
262 | } |