e882ed97d2552b71225fee0517698fcdf0143475
[lttng-tools.git] / src / bin / lttng-relayd / index.h
1 #ifndef _RELAY_INDEX_H
2 #define _RELAY_INDEX_H
3
4 /*
5 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
6 * David Goulet <dgoulet@efficios.com>
7 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License, version 2 only, as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 51
20 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include <inttypes.h>
24 #include <pthread.h>
25
26 #include <common/hashtable/hashtable.h>
27 #include <common/index/index.h>
28
29 #include "stream-fd.h"
30
31 struct relay_stream;
32
33 struct relay_index {
34 /*
35 * index lock nests inside stream lock.
36 */
37 pthread_mutex_t reflock; /* Protects refcounting. */
38 struct urcu_ref ref; /* Reference from getters. */
39 struct relay_stream *stream; /* Back ref to stream */
40
41 pthread_mutex_t lock;
42 /*
43 * FD on which to write the index data. May differ from
44 * stream->index_fd due to tracefile rotation.
45 */
46 struct stream_fd *index_fd;
47
48 /* Index packet data. This is the data that is written on disk. */
49 struct ctf_packet_index index_data;
50
51 bool has_index_data;
52 bool flushed;
53 bool in_hash_table;
54
55 /*
56 * Node within indexes_ht that corresponds to this struct
57 * relay_index. Indexed by net_seq_num, which is unique for this
58 * index across the stream.
59 */
60 struct lttng_ht_node_u64 index_n;
61 struct rcu_head rcu_node; /* For call_rcu teardown. */
62 };
63
64 struct relay_index *relay_index_get_by_id_or_create(struct relay_stream *stream,
65 uint64_t net_seq_num);
66 void relay_index_put(struct relay_index *index);
67 int relay_index_set_fd(struct relay_index *index, struct stream_fd *index_fd,
68 uint64_t data_offset);
69 int relay_index_set_data(struct relay_index *index,
70 const struct ctf_packet_index *data);
71 int relay_index_try_flush(struct relay_index *index);
72
73 void relay_index_close_all(struct relay_stream *stream);
74
75 #endif /* _RELAY_INDEX_H */
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