Commit | Line | Data |
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2a174661 DG |
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> |
2a174661 DG |
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 |
2a174661 | 21 | #include <common/common.h> |
7591bab1 MD |
22 | #include <common/utils.h> |
23 | #include <common/defaults.h> | |
24 | #include <urcu/rculist.h> | |
25 | #include <sys/stat.h> | |
2a174661 | 26 | |
7591bab1 | 27 | #include "lttng-relayd.h" |
2a174661 DG |
28 | #include "index.h" |
29 | #include "stream.h" | |
30 | #include "viewer-stream.h" | |
31 | ||
7591bab1 MD |
32 | /* Should be called with RCU read-side lock held. */ |
33 | bool stream_get(struct relay_stream *stream) | |
34 | { | |
35 | bool has_ref = false; | |
36 | ||
37 | pthread_mutex_lock(&stream->reflock); | |
38 | if (stream->ref.refcount != 0) { | |
39 | has_ref = true; | |
40 | urcu_ref_get(&stream->ref); | |
41 | } | |
42 | pthread_mutex_unlock(&stream->reflock); | |
43 | ||
44 | return has_ref; | |
45 | } | |
46 | ||
2a174661 | 47 | /* |
7591bab1 MD |
48 | * Get stream from stream id from the streams hash table. Return stream |
49 | * if found else NULL. A stream reference is taken when a stream is | |
50 | * returned. stream_put() must be called on that stream. | |
2a174661 | 51 | */ |
7591bab1 | 52 | struct relay_stream *stream_get_by_id(uint64_t stream_id) |
2a174661 DG |
53 | { |
54 | struct lttng_ht_node_u64 *node; | |
55 | struct lttng_ht_iter iter; | |
56 | struct relay_stream *stream = NULL; | |
57 | ||
7591bab1 MD |
58 | rcu_read_lock(); |
59 | lttng_ht_lookup(relay_streams_ht, &stream_id, &iter); | |
2a174661 | 60 | node = lttng_ht_iter_get_node_u64(&iter); |
7591bab1 | 61 | if (!node) { |
2a174661 DG |
62 | DBG("Relay stream %" PRIu64 " not found", stream_id); |
63 | goto end; | |
64 | } | |
65 | stream = caa_container_of(node, struct relay_stream, node); | |
7591bab1 MD |
66 | if (!stream_get(stream)) { |
67 | stream = NULL; | |
68 | } | |
2a174661 | 69 | end: |
7591bab1 | 70 | rcu_read_unlock(); |
2a174661 DG |
71 | return stream; |
72 | } | |
73 | ||
74 | /* | |
7591bab1 | 75 | * We keep ownership of path_name and channel_name. |
2a174661 | 76 | */ |
7591bab1 MD |
77 | struct relay_stream *stream_create(struct ctf_trace *trace, |
78 | uint64_t stream_handle, char *path_name, | |
79 | char *channel_name, uint64_t tracefile_size, | |
80 | uint64_t tracefile_count) | |
2a174661 | 81 | { |
7591bab1 MD |
82 | int ret; |
83 | struct relay_stream *stream = NULL; | |
84 | struct relay_session *session = trace->session; | |
2a174661 | 85 | |
7591bab1 MD |
86 | stream = zmalloc(sizeof(struct relay_stream)); |
87 | if (stream == NULL) { | |
88 | PERROR("relay stream zmalloc"); | |
7591bab1 MD |
89 | goto error_no_alloc; |
90 | } | |
2a174661 | 91 | |
7591bab1 MD |
92 | stream->stream_handle = stream_handle; |
93 | stream->prev_seq = -1ULL; | |
82b4cfcc | 94 | stream->prev_index_seq = -1ULL; |
bda7c7b9 | 95 | stream->last_net_seq_num = -1ULL; |
7591bab1 MD |
96 | stream->ctf_stream_id = -1ULL; |
97 | stream->tracefile_size = tracefile_size; | |
98 | stream->tracefile_count = tracefile_count; | |
99 | stream->path_name = path_name; | |
100 | stream->channel_name = channel_name; | |
44a019c2 | 101 | stream->beacon_ts_end = -1ULL; |
7591bab1 MD |
102 | lttng_ht_node_init_u64(&stream->node, stream->stream_handle); |
103 | pthread_mutex_init(&stream->lock, NULL); | |
104 | pthread_mutex_init(&stream->reflock, NULL); | |
105 | urcu_ref_init(&stream->ref); | |
106 | ctf_trace_get(trace); | |
107 | stream->trace = trace; | |
2a174661 | 108 | |
7591bab1 MD |
109 | stream->indexes_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
110 | if (!stream->indexes_ht) { | |
111 | ERR("Cannot created indexes_ht"); | |
112 | ret = -1; | |
113 | goto end; | |
2a174661 DG |
114 | } |
115 | ||
7591bab1 MD |
116 | ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG, |
117 | -1, -1); | |
118 | if (ret < 0) { | |
119 | ERR("relay creating output directory"); | |
120 | goto end; | |
121 | } | |
2a174661 | 122 | |
7591bab1 MD |
123 | /* |
124 | * No need to use run_as API here because whatever we receive, | |
125 | * the relayd uses its own credentials for the stream files. | |
126 | */ | |
127 | ret = utils_create_stream_file(stream->path_name, stream->channel_name, | |
128 | stream->tracefile_size, 0, -1, -1, NULL); | |
129 | if (ret < 0) { | |
130 | ERR("Create output file"); | |
131 | goto end; | |
132 | } | |
133 | stream->stream_fd = stream_fd_create(ret); | |
134 | if (!stream->stream_fd) { | |
135 | if (close(ret)) { | |
136 | PERROR("Error closing file %d", ret); | |
2a174661 | 137 | } |
7591bab1 MD |
138 | ret = -1; |
139 | goto end; | |
2a174661 | 140 | } |
a44ca2ca MD |
141 | stream->tfa = tracefile_array_create(stream->tracefile_count); |
142 | if (!stream->tfa) { | |
143 | ret = -1; | |
144 | goto end; | |
145 | } | |
7591bab1 MD |
146 | if (stream->tracefile_size) { |
147 | DBG("Tracefile %s/%s_0 created", stream->path_name, stream->channel_name); | |
148 | } else { | |
149 | DBG("Tracefile %s/%s created", stream->path_name, stream->channel_name); | |
150 | } | |
151 | ||
36d2e35d | 152 | if (!strncmp(stream->channel_name, DEFAULT_METADATA_NAME, LTTNG_NAME_MAX)) { |
7591bab1 MD |
153 | stream->is_metadata = 1; |
154 | } | |
155 | ||
156 | stream->in_recv_list = true; | |
157 | ||
158 | /* | |
159 | * Add the stream in the recv list of the session. Once the end stream | |
160 | * message is received, all session streams are published. | |
161 | */ | |
162 | pthread_mutex_lock(&session->recv_list_lock); | |
163 | cds_list_add_rcu(&stream->recv_node, &session->recv_list); | |
164 | session->stream_count++; | |
165 | pthread_mutex_unlock(&session->recv_list_lock); | |
166 | ||
167 | /* | |
168 | * Both in the ctf_trace object and the global stream ht since the data | |
169 | * side of the relayd does not have the concept of session. | |
170 | */ | |
171 | lttng_ht_add_unique_u64(relay_streams_ht, &stream->node); | |
77f7bd85 | 172 | stream->in_stream_ht = true; |
2a174661 | 173 | |
7591bab1 MD |
174 | DBG("Relay new stream added %s with ID %" PRIu64, stream->channel_name, |
175 | stream->stream_handle); | |
176 | ret = 0; | |
177 | ||
178 | end: | |
179 | if (ret) { | |
180 | if (stream->stream_fd) { | |
181 | stream_fd_put(stream->stream_fd); | |
182 | stream->stream_fd = NULL; | |
2a174661 | 183 | } |
7591bab1 MD |
184 | stream_put(stream); |
185 | stream = NULL; | |
2a174661 | 186 | } |
7591bab1 | 187 | return stream; |
2a174661 | 188 | |
7591bab1 MD |
189 | error_no_alloc: |
190 | /* | |
191 | * path_name and channel_name need to be freed explicitly here | |
192 | * because we cannot rely on stream_put(). | |
193 | */ | |
194 | free(path_name); | |
195 | free(channel_name); | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Called with the session lock held. | |
201 | */ | |
202 | void stream_publish(struct relay_stream *stream) | |
203 | { | |
204 | struct relay_session *session; | |
205 | ||
206 | pthread_mutex_lock(&stream->lock); | |
207 | if (stream->published) { | |
208 | goto unlock; | |
2a174661 DG |
209 | } |
210 | ||
7591bab1 | 211 | session = stream->trace->session; |
2a174661 | 212 | |
7591bab1 MD |
213 | pthread_mutex_lock(&session->recv_list_lock); |
214 | if (stream->in_recv_list) { | |
215 | cds_list_del_rcu(&stream->recv_node); | |
216 | stream->in_recv_list = false; | |
217 | } | |
218 | pthread_mutex_unlock(&session->recv_list_lock); | |
2a174661 | 219 | |
7591bab1 MD |
220 | pthread_mutex_lock(&stream->trace->stream_list_lock); |
221 | cds_list_add_rcu(&stream->stream_node, &stream->trace->stream_list); | |
222 | pthread_mutex_unlock(&stream->trace->stream_list_lock); | |
2a174661 | 223 | |
7591bab1 MD |
224 | stream->published = true; |
225 | unlock: | |
2a174661 | 226 | pthread_mutex_unlock(&stream->lock); |
2a174661 DG |
227 | } |
228 | ||
7591bab1 | 229 | /* |
77f7bd85 MD |
230 | * Stream must be protected by holding the stream lock or by virtue of being |
231 | * called from stream_destroy, in which case it is guaranteed to be accessed | |
232 | * from a single thread by the reflock. | |
7591bab1 MD |
233 | */ |
234 | static void stream_unpublish(struct relay_stream *stream) | |
2a174661 | 235 | { |
77f7bd85 MD |
236 | if (stream->in_stream_ht) { |
237 | struct lttng_ht_iter iter; | |
238 | int ret; | |
239 | ||
240 | iter.iter.node = &stream->node.node; | |
241 | ret = lttng_ht_del(relay_streams_ht, &iter); | |
242 | assert(!ret); | |
243 | stream->in_stream_ht = false; | |
244 | } | |
245 | if (stream->published) { | |
246 | pthread_mutex_lock(&stream->trace->stream_list_lock); | |
247 | cds_list_del_rcu(&stream->stream_node); | |
248 | pthread_mutex_unlock(&stream->trace->stream_list_lock); | |
249 | stream->published = false; | |
7591bab1 | 250 | } |
7591bab1 MD |
251 | } |
252 | ||
253 | static void stream_destroy(struct relay_stream *stream) | |
254 | { | |
255 | if (stream->indexes_ht) { | |
49e614cb MD |
256 | /* |
257 | * Calling lttng_ht_destroy in call_rcu worker thread so | |
258 | * we don't hold the RCU read-side lock while calling | |
259 | * it. | |
260 | */ | |
7591bab1 MD |
261 | lttng_ht_destroy(stream->indexes_ht); |
262 | } | |
a44ca2ca MD |
263 | if (stream->tfa) { |
264 | tracefile_array_destroy(stream->tfa); | |
265 | } | |
7591bab1 MD |
266 | free(stream->path_name); |
267 | free(stream->channel_name); | |
268 | free(stream); | |
269 | } | |
270 | ||
271 | static void stream_destroy_rcu(struct rcu_head *rcu_head) | |
272 | { | |
273 | struct relay_stream *stream = | |
274 | caa_container_of(rcu_head, struct relay_stream, rcu_node); | |
275 | ||
276 | stream_destroy(stream); | |
277 | } | |
278 | ||
279 | /* | |
280 | * No need to take stream->lock since this is only called on the final | |
281 | * stream_put which ensures that a single thread may act on the stream. | |
282 | * | |
283 | * At that point, the object is also protected by the reflock which | |
284 | * guarantees that no other thread may share ownership of this stream. | |
285 | */ | |
286 | static void stream_release(struct urcu_ref *ref) | |
287 | { | |
288 | struct relay_stream *stream = | |
289 | caa_container_of(ref, struct relay_stream, ref); | |
290 | struct relay_session *session; | |
2a174661 | 291 | |
7591bab1 MD |
292 | session = stream->trace->session; |
293 | ||
294 | DBG("Releasing stream id %" PRIu64, stream->stream_handle); | |
295 | ||
296 | pthread_mutex_lock(&session->recv_list_lock); | |
297 | session->stream_count--; | |
298 | if (stream->in_recv_list) { | |
299 | cds_list_del_rcu(&stream->recv_node); | |
300 | stream->in_recv_list = false; | |
301 | } | |
302 | pthread_mutex_unlock(&session->recv_list_lock); | |
2a174661 | 303 | |
7591bab1 MD |
304 | stream_unpublish(stream); |
305 | ||
306 | if (stream->stream_fd) { | |
307 | stream_fd_put(stream->stream_fd); | |
308 | stream->stream_fd = NULL; | |
309 | } | |
f8f3885c MD |
310 | if (stream->index_file) { |
311 | lttng_index_file_put(stream->index_file); | |
312 | stream->index_file = NULL; | |
7591bab1 MD |
313 | } |
314 | if (stream->trace) { | |
315 | ctf_trace_put(stream->trace); | |
316 | stream->trace = NULL; | |
317 | } | |
318 | ||
319 | call_rcu(&stream->rcu_node, stream_destroy_rcu); | |
2a174661 DG |
320 | } |
321 | ||
7591bab1 | 322 | void stream_put(struct relay_stream *stream) |
2a174661 | 323 | { |
7591bab1 MD |
324 | DBG("stream put for stream id %" PRIu64, stream->stream_handle); |
325 | /* | |
326 | * Ensure existence of stream->reflock for stream unlock. | |
327 | */ | |
328 | rcu_read_lock(); | |
329 | /* | |
330 | * Stream reflock ensures that concurrent test and update of | |
331 | * stream ref is atomic. | |
332 | */ | |
333 | pthread_mutex_lock(&stream->reflock); | |
334 | assert(stream->ref.refcount != 0); | |
335 | /* | |
336 | * Wait until we have processed all the stream packets before | |
337 | * actually putting our last stream reference. | |
338 | */ | |
339 | DBG("stream put stream id %" PRIu64 " refcount %d", | |
340 | stream->stream_handle, | |
341 | (int) stream->ref.refcount); | |
342 | urcu_ref_put(&stream->ref, stream_release); | |
343 | pthread_mutex_unlock(&stream->reflock); | |
344 | rcu_read_unlock(); | |
345 | } | |
346 | ||
bda7c7b9 | 347 | void try_stream_close(struct relay_stream *stream) |
7591bab1 | 348 | { |
98ba050e JR |
349 | bool session_aborted; |
350 | struct relay_session *session = stream->trace->session; | |
351 | ||
bda7c7b9 | 352 | DBG("Trying to close stream %" PRIu64, stream->stream_handle); |
98ba050e JR |
353 | |
354 | pthread_mutex_lock(&session->lock); | |
355 | session_aborted = session->aborted; | |
356 | pthread_mutex_unlock(&session->lock); | |
357 | ||
7591bab1 | 358 | pthread_mutex_lock(&stream->lock); |
bda7c7b9 JG |
359 | /* |
360 | * Can be called concurently by connection close and reception of last | |
361 | * pending data. | |
362 | */ | |
363 | if (stream->closed) { | |
364 | pthread_mutex_unlock(&stream->lock); | |
365 | DBG("closing stream %" PRIu64 " aborted since it is already marked as closed", stream->stream_handle); | |
366 | return; | |
367 | } | |
368 | ||
369 | stream->close_requested = true; | |
3d07a857 MD |
370 | |
371 | if (stream->last_net_seq_num == -1ULL) { | |
372 | /* | |
373 | * Handle connection close without explicit stream close | |
374 | * command. | |
375 | * | |
376 | * We can be clever about indexes partially received in | |
377 | * cases where we received the data socket part, but not | |
378 | * the control socket part: since we're currently closing | |
379 | * the stream on behalf of the control socket, we *know* | |
380 | * there won't be any more control information for this | |
381 | * socket. Therefore, we can destroy all indexes for | |
382 | * which we have received only the file descriptor (from | |
383 | * data socket). This takes care of consumerd crashes | |
384 | * between sending the data and control information for | |
385 | * a packet. Since those are sent in that order, we take | |
386 | * care of consumerd crashes. | |
387 | */ | |
388 | relay_index_close_partial_fd(stream); | |
389 | /* | |
390 | * Use the highest net_seq_num we currently have pending | |
391 | * As end of stream indicator. Leave last_net_seq_num | |
392 | * at -1ULL if we cannot find any index. | |
393 | */ | |
394 | stream->last_net_seq_num = relay_index_find_last(stream); | |
395 | /* Fall-through into the next check. */ | |
396 | } | |
397 | ||
bda7c7b9 | 398 | if (stream->last_net_seq_num != -1ULL && |
98ba050e JR |
399 | ((int64_t) (stream->prev_seq - stream->last_net_seq_num)) < 0 |
400 | && !session_aborted) { | |
3d07a857 MD |
401 | /* |
402 | * Don't close since we still have data pending. This | |
403 | * handles cases where an explicit close command has | |
404 | * been received for this stream, and cases where the | |
405 | * connection has been closed, and we are awaiting for | |
406 | * index information from the data socket. It is | |
407 | * therefore expected that all the index fd information | |
408 | * we need has already been received on the control | |
409 | * socket. Matching index information from data socket | |
410 | * should be Expected Soon(TM). | |
411 | * | |
412 | * TODO: We should implement a timer to garbage collect | |
413 | * streams after a timeout to be resilient against a | |
414 | * consumerd implementation that would not match this | |
415 | * expected behavior. | |
416 | */ | |
bda7c7b9 JG |
417 | pthread_mutex_unlock(&stream->lock); |
418 | DBG("closing stream %" PRIu64 " aborted since it still has data pending", stream->stream_handle); | |
419 | return; | |
420 | } | |
3d07a857 MD |
421 | /* |
422 | * We received all the indexes we can expect. | |
423 | */ | |
77f7bd85 | 424 | stream_unpublish(stream); |
2229a09c | 425 | stream->closed = true; |
bda7c7b9 | 426 | /* Relay indexes are only used by the "consumer/sessiond" end. */ |
7591bab1 MD |
427 | relay_index_close_all(stream); |
428 | pthread_mutex_unlock(&stream->lock); | |
bda7c7b9 | 429 | DBG("Succeeded in closing stream %" PRIu64, stream->stream_handle); |
7591bab1 MD |
430 | stream_put(stream); |
431 | } | |
432 | ||
da412cde MD |
433 | static void print_stream_indexes(struct relay_stream *stream) |
434 | { | |
435 | struct lttng_ht_iter iter; | |
436 | struct relay_index *index; | |
437 | ||
438 | rcu_read_lock(); | |
439 | cds_lfht_for_each_entry(stream->indexes_ht->ht, &iter.iter, index, | |
440 | index_n.node) { | |
441 | DBG("index %p net_seq_num %" PRIu64 " refcount %ld" | |
442 | " stream %" PRIu64 " trace %" PRIu64 | |
443 | " session %" PRIu64, | |
444 | index, | |
445 | index->index_n.key, | |
446 | stream->ref.refcount, | |
447 | index->stream->stream_handle, | |
448 | index->stream->trace->id, | |
449 | index->stream->trace->session->id); | |
450 | } | |
451 | rcu_read_unlock(); | |
452 | } | |
453 | ||
7591bab1 MD |
454 | void print_relay_streams(void) |
455 | { | |
456 | struct lttng_ht_iter iter; | |
457 | struct relay_stream *stream; | |
458 | ||
ce3f3ba3 JG |
459 | if (!relay_streams_ht) { |
460 | return; | |
461 | } | |
462 | ||
7591bab1 MD |
463 | rcu_read_lock(); |
464 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream, | |
465 | node.node) { | |
466 | if (!stream_get(stream)) { | |
467 | continue; | |
468 | } | |
469 | DBG("stream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 | |
470 | " session %" PRIu64, | |
471 | stream, | |
472 | stream->ref.refcount, | |
473 | stream->stream_handle, | |
474 | stream->trace->id, | |
475 | stream->trace->session->id); | |
da412cde | 476 | print_stream_indexes(stream); |
7591bab1 MD |
477 | stream_put(stream); |
478 | } | |
479 | rcu_read_unlock(); | |
2a174661 | 480 | } |
82b4cfcc MD |
481 | |
482 | static int relay_unlink_stream_files_rotation(struct relay_stream *stream) | |
483 | { | |
484 | uint64_t tracefile_size = stream->tracefile_size; | |
485 | uint64_t tracefile_count = stream->tracefile_count; | |
486 | uint64_t count; | |
487 | int ret; | |
488 | ||
489 | /* | |
490 | * If the channel is configured to have an open-ended number of tracefiles, | |
491 | * use the current tracefile count number as upper-bound. | |
492 | */ | |
493 | if (!tracefile_count) { | |
494 | tracefile_count = stream->tracefile_count_current + 1; | |
495 | } | |
496 | ||
497 | /* | |
498 | * Try to unlink each file and each index for this stream. They may not exist, | |
499 | * in which case ENOENT is fine. | |
500 | */ | |
501 | for (count = 0; count < tracefile_count; count++) { | |
502 | ret = utils_unlink_stream_file(stream->path_name, stream->channel_name, | |
503 | tracefile_size, count, -1, -1, NULL); | |
504 | if (ret < 0 && errno != ENOENT) { | |
505 | return -1; | |
506 | } | |
507 | } | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static int relay_unlink_index_files_rotation(struct relay_stream *stream) | |
512 | { | |
513 | uint64_t tracefile_size = stream->tracefile_size; | |
514 | uint64_t tracefile_count = stream->tracefile_count; | |
515 | uint64_t count; | |
516 | int ret; | |
517 | ||
518 | /* | |
519 | * If the channel is configured to have an open-ended number of tracefiles, | |
520 | * use the current tracefile count number as upper-bound. | |
521 | */ | |
522 | if (!tracefile_count) { | |
523 | tracefile_count = stream->tracefile_count_current + 1; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Try to unlink each file and each index for this stream. They may not exist, | |
528 | * in which case ENOENT is fine. | |
529 | */ | |
530 | for (count = 0; count < tracefile_count; count++) { | |
531 | if (stream->index_file) { | |
532 | ret = lttng_index_file_unlink(stream->path_name, stream->channel_name, | |
533 | -1, -1, tracefile_size, count); | |
534 | if (ret < 0 && errno != ENOENT) { | |
535 | return -1; | |
536 | } | |
537 | } | |
538 | } | |
539 | return 0; | |
540 | } | |
541 | ||
542 | static int relay_unlink_stream_files(struct relay_stream *stream) | |
543 | { | |
544 | int ret; | |
545 | ||
546 | ret = utils_unlink_stream_file(stream->path_name, stream->channel_name, | |
547 | stream->tracefile_size, 0, -1, -1, NULL); | |
548 | if (ret < 0 && errno != ENOENT) { | |
549 | return -1; | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static int relay_unlink_index_files(struct relay_stream *stream) | |
555 | { | |
556 | int ret; | |
557 | ||
558 | ret = lttng_index_file_unlink(stream->path_name, stream->channel_name, | |
559 | -1, -1, stream->tracefile_size, 0); | |
560 | if (ret < 0 && errno != ENOENT) { | |
561 | return -1; | |
562 | } | |
563 | return 0; | |
564 | } | |
565 | ||
566 | int try_stream_clear_index_data(struct relay_stream *stream) | |
567 | { | |
568 | int ret = 0; | |
569 | ||
570 | DBG("try stream clear for handle %" PRIu64 " recv %" PRIu64 " clear_pos_idx %" PRIu64 " clear_pos_data %" PRIu64, | |
571 | stream->stream_handle, stream->index_received_seqcount, stream->clear_position_index_seqcount, | |
572 | stream->clear_position_data_seqcount); | |
573 | if (!stream->index_received_seqcount) { | |
574 | return 0; | |
575 | } | |
576 | if (stream->index_received_seqcount <= stream->clear_position_index_seqcount) { | |
577 | /* | |
578 | * Put ref on current index file. The new index file will be created upon | |
579 | * reception of next index data beyond the clear position. | |
580 | */ | |
581 | if (stream->index_file) { | |
582 | lttng_index_file_put(stream->index_file); | |
583 | if (stream->tracefile_size > 0) { | |
584 | ret = relay_unlink_index_files_rotation(stream); | |
585 | } else { | |
586 | ret = relay_unlink_index_files(stream); | |
587 | } | |
588 | if (ret) { | |
589 | return ret; | |
590 | } | |
591 | stream->index_file = NULL; | |
592 | } | |
593 | tracefile_array_reset(stream->tfa); | |
594 | } | |
595 | if (stream->index_received_seqcount == stream->clear_position_data_seqcount) { | |
596 | ret = close(stream->stream_fd->fd); | |
597 | if (ret < 0) { | |
598 | PERROR("Closing tracefile"); | |
599 | return -1; | |
600 | } | |
601 | stream->stream_fd->fd = -1; | |
602 | stream->tracefile_size_current = 0; | |
603 | ||
604 | if (stream->tracefile_size > 0) { | |
605 | ret = relay_unlink_stream_files_rotation(stream); | |
606 | } else { | |
607 | ret = relay_unlink_stream_files(stream); | |
608 | } | |
609 | ||
610 | /* Create new files. */ | |
611 | ret = utils_create_stream_file(stream->path_name, stream->channel_name, | |
612 | stream->tracefile_size, 0, -1, -1, NULL); | |
613 | if (ret < 0) { | |
614 | ERR("Create output file"); | |
615 | return -1; | |
616 | } | |
617 | stream->stream_fd->fd = ret; | |
618 | } | |
619 | return 0; | |
620 | } | |
621 | ||
622 | int stream_clear(struct relay_stream *stream) | |
623 | { | |
624 | int ret = 0; | |
625 | ||
626 | pthread_mutex_lock(&stream->lock); | |
627 | ||
628 | if (stream->is_metadata) { | |
629 | /* Do not clear metadata streams. */ | |
630 | goto end; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Clear index and data for all packets up to and including the | |
635 | * clear position index seqcount. | |
636 | * | |
637 | * Clearing the index is straightforward: we can remove the entire | |
638 | * on-disk index for this stream because the control port is an ordered | |
639 | * protocol. We may also have in-flight indexes within the indexes_ht | |
640 | * (pending data reception). We need to mark those so they get | |
641 | * discarded (as well as their associated data content) upon reception | |
642 | * of matching data. | |
643 | * | |
644 | * Clearing the data: because data is written directly into the output files, | |
645 | * we need to carefully handle cases where index or data positions are ahead | |
646 | * of the other. | |
647 | * | |
648 | * In tracefile rotation mode, we need to move the seq_tail to the head | |
649 | * position. | |
650 | */ | |
651 | ||
652 | /* | |
653 | * If the data received is beyond indexes received, unlink data immediately and | |
654 | * discard indexes when they arrive (up to the clear position). | |
655 | * | |
656 | * If indexes received is beyond data, we will reach the sync point when the | |
657 | * indexes are received, so it will be safe to unlink the data and index files | |
658 | * at that point. | |
659 | * | |
660 | * Clear index and data file(s) immediately if reaching the clear | |
661 | * position (no in-flight indexes). | |
662 | */ | |
663 | DBG("stream clear for handle %" PRIu64 " prev_seq %" PRIu64 " prev_index_seq %" PRIu64 " indexes in flight %d", | |
664 | stream->stream_handle, stream->prev_seq, stream->prev_index_seq, | |
665 | stream->indexes_in_flight); | |
666 | if (stream->prev_seq > stream->prev_index_seq) { | |
667 | stream->clear_position_data_seqcount = stream->index_received_seqcount; | |
668 | stream->clear_position_index_seqcount = stream->index_received_seqcount + | |
669 | stream->indexes_in_flight; | |
670 | } else if (stream->prev_seq < stream->prev_index_seq) { | |
671 | stream->clear_position_data_seqcount = stream->index_received_seqcount + | |
672 | stream->indexes_in_flight; | |
673 | stream->clear_position_index_seqcount = stream->index_received_seqcount + | |
674 | stream->indexes_in_flight; | |
675 | } else { | |
676 | assert(stream->indexes_in_flight == 0); | |
677 | stream->clear_position_data_seqcount = stream->index_received_seqcount; | |
678 | stream->clear_position_index_seqcount = stream->index_received_seqcount; | |
679 | ||
680 | } | |
681 | ret = try_stream_clear_index_data(stream); | |
682 | if (ret) { | |
683 | goto end; | |
684 | } | |
685 | ||
686 | end: | |
687 | pthread_mutex_unlock(&stream->lock); | |
688 | return ret; | |
689 | } |