Commit | Line | Data |
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1c20f0e2 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
7591bab1 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
1c20f0e2 JD |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License, version 2 only, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
1c20f0e2 JD |
21 | #include <assert.h> |
22 | ||
23 | #include <common/common.h> | |
24 | #include <common/utils.h> | |
d3ecc550 | 25 | #include <common/compat/endian.h> |
1c20f0e2 | 26 | |
0a6518b0 | 27 | #include "lttng-relayd.h" |
7591bab1 | 28 | #include "stream.h" |
1c20f0e2 JD |
29 | #include "index.h" |
30 | ||
31 | /* | |
7591bab1 MD |
32 | * Allocate a new relay index object. Pass the stream in which it is |
33 | * contained as parameter. The sequence number will be used as the hash | |
34 | * table key. | |
35 | * | |
36 | * Called with stream mutex held. | |
37 | * Return allocated object or else NULL on error. | |
1c20f0e2 | 38 | */ |
7591bab1 MD |
39 | static struct relay_index *relay_index_create(struct relay_stream *stream, |
40 | uint64_t net_seq_num) | |
1c20f0e2 | 41 | { |
7591bab1 | 42 | struct relay_index *index; |
1c20f0e2 | 43 | |
7591bab1 MD |
44 | DBG2("Creating relay index for stream id %" PRIu64 " and seqnum %" PRIu64, |
45 | stream->stream_handle, net_seq_num); | |
1c20f0e2 | 46 | |
7591bab1 MD |
47 | index = zmalloc(sizeof(*index)); |
48 | if (!index) { | |
49 | PERROR("Relay index zmalloc"); | |
50 | goto end; | |
51 | } | |
52 | if (!stream_get(stream)) { | |
53 | ERR("Cannot get stream"); | |
54 | free(index); | |
55 | index = NULL; | |
56 | goto end; | |
1c20f0e2 | 57 | } |
7591bab1 | 58 | index->stream = stream; |
1c20f0e2 | 59 | |
7591bab1 MD |
60 | lttng_ht_node_init_u64(&index->index_n, net_seq_num); |
61 | pthread_mutex_init(&index->lock, NULL); | |
7591bab1 MD |
62 | urcu_ref_init(&index->ref); |
63 | ||
64 | end: | |
65 | return index; | |
1c20f0e2 JD |
66 | } |
67 | ||
68 | /* | |
7591bab1 MD |
69 | * Add unique relay index to the given hash table. In case of a collision, the |
70 | * already existing object is put in the given _index variable. | |
1c20f0e2 | 71 | * |
7591bab1 | 72 | * RCU read side lock MUST be acquired. |
1c20f0e2 | 73 | */ |
7591bab1 MD |
74 | static struct relay_index *relay_index_add_unique(struct relay_stream *stream, |
75 | struct relay_index *index) | |
1c20f0e2 | 76 | { |
7591bab1 MD |
77 | struct cds_lfht_node *node_ptr; |
78 | struct relay_index *_index; | |
1c20f0e2 | 79 | |
7591bab1 MD |
80 | DBG2("Adding relay index with stream id %" PRIu64 " and seqnum %" PRIu64, |
81 | stream->stream_handle, index->index_n.key); | |
1c20f0e2 | 82 | |
7591bab1 MD |
83 | node_ptr = cds_lfht_add_unique(stream->indexes_ht->ht, |
84 | stream->indexes_ht->hash_fct(&index->index_n, lttng_ht_seed), | |
85 | stream->indexes_ht->match_fct, &index->index_n, | |
86 | &index->index_n.node); | |
87 | if (node_ptr != &index->index_n.node) { | |
88 | _index = caa_container_of(node_ptr, struct relay_index, | |
89 | index_n.node); | |
90 | } else { | |
91 | _index = NULL; | |
1c20f0e2 | 92 | } |
7591bab1 MD |
93 | return _index; |
94 | } | |
95 | ||
96 | /* | |
97 | * Should be called with RCU read-side lock held. | |
98 | */ | |
99 | static bool relay_index_get(struct relay_index *index) | |
100 | { | |
7591bab1 MD |
101 | DBG2("index get for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d", |
102 | index->stream->stream_handle, index->index_n.key, | |
103 | (int) index->ref.refcount); | |
1c20f0e2 | 104 | |
ce4d4083 | 105 | return urcu_ref_get_unless_zero(&index->ref); |
1c20f0e2 JD |
106 | } |
107 | ||
108 | /* | |
7591bab1 MD |
109 | * Get a relayd index in within the given stream, or create it if not |
110 | * present. | |
1c20f0e2 | 111 | * |
7591bab1 | 112 | * Called with stream mutex held. |
1c20f0e2 JD |
113 | * Return index object or else NULL on error. |
114 | */ | |
7591bab1 MD |
115 | struct relay_index *relay_index_get_by_id_or_create(struct relay_stream *stream, |
116 | uint64_t net_seq_num) | |
1c20f0e2 | 117 | { |
7591bab1 | 118 | struct lttng_ht_node_u64 *node; |
1c20f0e2 | 119 | struct lttng_ht_iter iter; |
1c20f0e2 JD |
120 | struct relay_index *index = NULL; |
121 | ||
1c20f0e2 | 122 | DBG3("Finding index for stream id %" PRIu64 " and seq_num %" PRIu64, |
7591bab1 | 123 | stream->stream_handle, net_seq_num); |
1c20f0e2 | 124 | |
7591bab1 MD |
125 | rcu_read_lock(); |
126 | lttng_ht_lookup(stream->indexes_ht, &net_seq_num, &iter); | |
127 | node = lttng_ht_iter_get_node_u64(&iter); | |
128 | if (node) { | |
129 | index = caa_container_of(node, struct relay_index, index_n); | |
130 | } else { | |
131 | struct relay_index *oldindex; | |
132 | ||
133 | index = relay_index_create(stream, net_seq_num); | |
134 | if (!index) { | |
135 | ERR("Cannot create index for stream id %" PRIu64 " and seq_num %" PRIu64, | |
811a4037 | 136 | stream->stream_handle, net_seq_num); |
7591bab1 MD |
137 | goto end; |
138 | } | |
139 | oldindex = relay_index_add_unique(stream, index); | |
140 | if (oldindex) { | |
141 | /* Added concurrently, keep old. */ | |
142 | relay_index_put(index); | |
143 | index = oldindex; | |
144 | if (!relay_index_get(index)) { | |
145 | index = NULL; | |
146 | } | |
147 | } else { | |
148 | stream->indexes_in_flight++; | |
149 | index->in_hash_table = true; | |
150 | } | |
1c20f0e2 | 151 | } |
1c20f0e2 | 152 | end: |
7591bab1 MD |
153 | rcu_read_unlock(); |
154 | DBG2("Index %sfound or created in HT for stream ID %" PRIu64 " and seqnum %" PRIu64, | |
719155c2 | 155 | (index == NULL) ? "NOT " : "", stream->stream_handle, net_seq_num); |
1c20f0e2 JD |
156 | return index; |
157 | } | |
158 | ||
f8f3885c MD |
159 | int relay_index_set_file(struct relay_index *index, |
160 | struct lttng_index_file *index_file, | |
7591bab1 | 161 | uint64_t data_offset) |
1c20f0e2 | 162 | { |
7591bab1 | 163 | int ret = 0; |
1c20f0e2 | 164 | |
7591bab1 | 165 | pthread_mutex_lock(&index->lock); |
f8f3885c | 166 | if (index->index_file) { |
7591bab1 MD |
167 | ret = -1; |
168 | goto end; | |
169 | } | |
f8f3885c MD |
170 | lttng_index_file_get(index_file); |
171 | index->index_file = index_file; | |
7591bab1 MD |
172 | index->index_data.offset = data_offset; |
173 | end: | |
174 | pthread_mutex_unlock(&index->lock); | |
175 | return ret; | |
176 | } | |
1c20f0e2 | 177 | |
7591bab1 MD |
178 | int relay_index_set_data(struct relay_index *index, |
179 | const struct ctf_packet_index *data) | |
180 | { | |
181 | int ret = 0; | |
1c20f0e2 | 182 | |
7591bab1 MD |
183 | pthread_mutex_lock(&index->lock); |
184 | if (index->has_index_data) { | |
185 | ret = -1; | |
186 | goto end; | |
1c20f0e2 | 187 | } |
7591bab1 MD |
188 | /* Set everything except data_offset. */ |
189 | index->index_data.packet_size = data->packet_size; | |
190 | index->index_data.content_size = data->content_size; | |
191 | index->index_data.timestamp_begin = data->timestamp_begin; | |
192 | index->index_data.timestamp_end = data->timestamp_end; | |
193 | index->index_data.events_discarded = data->events_discarded; | |
194 | index->index_data.stream_id = data->stream_id; | |
195 | index->has_index_data = true; | |
196 | end: | |
197 | pthread_mutex_unlock(&index->lock); | |
198 | return ret; | |
1c20f0e2 JD |
199 | } |
200 | ||
7591bab1 | 201 | static void index_destroy(struct relay_index *index) |
1c20f0e2 | 202 | { |
7591bab1 MD |
203 | free(index); |
204 | } | |
1c20f0e2 | 205 | |
7591bab1 MD |
206 | static void index_destroy_rcu(struct rcu_head *rcu_head) |
207 | { | |
208 | struct relay_index *index = | |
209 | caa_container_of(rcu_head, struct relay_index, rcu_node); | |
1c20f0e2 | 210 | |
7591bab1 | 211 | index_destroy(index); |
1c20f0e2 JD |
212 | } |
213 | ||
7591bab1 MD |
214 | /* Stream lock must be held by the caller. */ |
215 | static void index_release(struct urcu_ref *ref) | |
1c20f0e2 | 216 | { |
7591bab1 MD |
217 | struct relay_index *index = caa_container_of(ref, struct relay_index, ref); |
218 | struct relay_stream *stream = index->stream; | |
219 | int ret; | |
220 | struct lttng_ht_iter iter; | |
221 | ||
f8f3885c MD |
222 | if (index->index_file) { |
223 | lttng_index_file_put(index->index_file); | |
224 | index->index_file = NULL; | |
7591bab1 MD |
225 | } |
226 | if (index->in_hash_table) { | |
227 | /* Delete index from hash table. */ | |
228 | iter.iter.node = &index->index_n.node; | |
229 | ret = lttng_ht_del(stream->indexes_ht, &iter); | |
230 | assert(!ret); | |
231 | stream->indexes_in_flight--; | |
232 | } | |
233 | ||
234 | stream_put(index->stream); | |
235 | index->stream = NULL; | |
236 | ||
237 | call_rcu(&index->rcu_node, index_destroy_rcu); | |
1c20f0e2 JD |
238 | } |
239 | ||
240 | /* | |
7591bab1 MD |
241 | * Called with stream mutex held. |
242 | * | |
243 | * Stream lock must be held by the caller. | |
1c20f0e2 | 244 | */ |
7591bab1 | 245 | void relay_index_put(struct relay_index *index) |
1c20f0e2 | 246 | { |
7591bab1 MD |
247 | DBG2("index put for stream id %" PRIu64 " and seqnum %" PRIu64 " refcount %d", |
248 | index->stream->stream_handle, index->index_n.key, | |
249 | (int) index->ref.refcount); | |
250 | /* | |
251 | * Ensure existance of index->lock for index unlock. | |
252 | */ | |
253 | rcu_read_lock(); | |
254 | /* | |
255 | * Index lock ensures that concurrent test and update of stream | |
256 | * ref is atomic. | |
257 | */ | |
7591bab1 MD |
258 | assert(index->ref.refcount != 0); |
259 | urcu_ref_put(&index->ref, index_release); | |
7591bab1 | 260 | rcu_read_unlock(); |
1c20f0e2 JD |
261 | } |
262 | ||
263 | /* | |
7591bab1 MD |
264 | * Try to flush index to disk. Releases self-reference to index once |
265 | * flush succeeds. | |
1c20f0e2 | 266 | * |
7591bab1 MD |
267 | * Stream lock must be held by the caller. |
268 | * Return 0 on successful flush, a negative value on error, or positive | |
269 | * value if no flush was performed. | |
1c20f0e2 | 270 | */ |
7591bab1 | 271 | int relay_index_try_flush(struct relay_index *index) |
1c20f0e2 | 272 | { |
7591bab1 MD |
273 | int ret = 1; |
274 | bool flushed = false; | |
275 | int fd; | |
1c20f0e2 | 276 | |
7591bab1 MD |
277 | pthread_mutex_lock(&index->lock); |
278 | if (index->flushed) { | |
279 | goto skip; | |
280 | } | |
281 | /* Check if we are ready to flush. */ | |
f8f3885c | 282 | if (!index->has_index_data || !index->index_file) { |
7591bab1 MD |
283 | goto skip; |
284 | } | |
f8f3885c | 285 | fd = index->index_file->fd; |
7591bab1 MD |
286 | DBG2("Writing index for stream ID %" PRIu64 " and seq num %" PRIu64 |
287 | " on fd %d", index->stream->stream_handle, | |
288 | index->index_n.key, fd); | |
289 | flushed = true; | |
290 | index->flushed = true; | |
f8f3885c | 291 | ret = lttng_index_file_write(index->index_file, &index->index_data); |
7591bab1 MD |
292 | skip: |
293 | pthread_mutex_unlock(&index->lock); | |
1c20f0e2 | 294 | |
7591bab1 MD |
295 | if (flushed) { |
296 | /* Put self-ref from index now that it has been flushed. */ | |
297 | relay_index_put(index); | |
298 | } | |
299 | return ret; | |
1c20f0e2 JD |
300 | } |
301 | ||
302 | /* | |
7591bab1 MD |
303 | * Close every relay index within a given stream, without flushing |
304 | * them. | |
1c20f0e2 | 305 | */ |
7591bab1 | 306 | void relay_index_close_all(struct relay_stream *stream) |
1c20f0e2 JD |
307 | { |
308 | struct lttng_ht_iter iter; | |
309 | struct relay_index *index; | |
310 | ||
1c20f0e2 | 311 | rcu_read_lock(); |
7591bab1 MD |
312 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, |
313 | index, index_n.node) { | |
314 | /* Put self-ref from index. */ | |
315 | relay_index_put(index); | |
1c20f0e2 JD |
316 | } |
317 | rcu_read_unlock(); | |
318 | } | |
3d07a857 MD |
319 | |
320 | void relay_index_close_partial_fd(struct relay_stream *stream) | |
321 | { | |
322 | struct lttng_ht_iter iter; | |
323 | struct relay_index *index; | |
324 | ||
325 | rcu_read_lock(); | |
326 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, | |
327 | index, index_n.node) { | |
f8f3885c | 328 | if (!index->index_file) { |
3d07a857 MD |
329 | continue; |
330 | } | |
331 | /* | |
f8f3885c | 332 | * Partial index has its index_file: we have only |
3d07a857 MD |
333 | * received its info from the data socket. |
334 | * Put self-ref from index. | |
335 | */ | |
336 | relay_index_put(index); | |
337 | } | |
338 | rcu_read_unlock(); | |
339 | } | |
340 | ||
341 | uint64_t relay_index_find_last(struct relay_stream *stream) | |
342 | { | |
343 | struct lttng_ht_iter iter; | |
344 | struct relay_index *index; | |
345 | uint64_t net_seq_num = -1ULL; | |
346 | ||
347 | rcu_read_lock(); | |
348 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, | |
349 | index, index_n.node) { | |
350 | if (net_seq_num == -1ULL || | |
351 | index->index_n.key > net_seq_num) { | |
352 | net_seq_num = index->index_n.key; | |
353 | } | |
354 | } | |
355 | rcu_read_unlock(); | |
356 | return net_seq_num; | |
357 | } | |
d3ecc550 JD |
358 | |
359 | /* | |
360 | * Update the index file of an already existing relay_index. | |
361 | * Offsets by 'removed_data_count' the offset field of an index. | |
362 | */ | |
363 | static | |
364 | int relay_index_switch_file(struct relay_index *index, | |
365 | struct lttng_index_file *new_index_file, | |
366 | uint64_t removed_data_count) | |
367 | { | |
368 | int ret = 0; | |
369 | uint64_t offset; | |
370 | ||
371 | pthread_mutex_lock(&index->lock); | |
372 | if (!index->index_file) { | |
373 | ERR("No index_file"); | |
374 | ret = 0; | |
375 | goto end; | |
376 | } | |
377 | ||
378 | lttng_index_file_put(index->index_file); | |
379 | lttng_index_file_get(new_index_file); | |
380 | index->index_file = new_index_file; | |
381 | offset = be64toh(index->index_data.offset); | |
382 | index->index_data.offset = htobe64(offset - removed_data_count); | |
383 | ||
384 | end: | |
385 | pthread_mutex_unlock(&index->lock); | |
386 | return ret; | |
387 | } | |
388 | ||
389 | /* | |
390 | * Switch the index file of all pending indexes for a stream and update the | |
391 | * data offset by substracting the last safe position. | |
392 | * Stream lock must be held. | |
393 | */ | |
394 | int relay_index_switch_all_files(struct relay_stream *stream) | |
395 | { | |
396 | struct lttng_ht_iter iter; | |
397 | struct relay_index *index; | |
398 | int ret = 0; | |
399 | ||
400 | rcu_read_lock(); | |
401 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, | |
402 | index, index_n.node) { | |
403 | DBG("Update index to fd %d", stream->index_file->fd); | |
404 | ret = relay_index_switch_file(index, stream->index_file, | |
405 | stream->pos_after_last_complete_data_index); | |
406 | if (ret) { | |
407 | goto end; | |
408 | } | |
409 | } | |
410 | end: | |
411 | rcu_read_unlock(); | |
412 | return ret; | |
413 | } |