Support snapshot max-size limitation
[lttng-tools.git] / src / bin / lttng-sessiond / buffer-registry.h
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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#ifndef LTTNG_BUFFER_REGISTRY_H
19#define LTTNG_BUFFER_REGISTRY_H
20
21#include <stdint.h>
22#include <urcu/list.h>
23
24#include <lttng/lttng.h>
25#include <common/hashtable/hashtable.h>
26
27#include "consumer.h"
28#include "ust-ctl.h"
29#include "ust-registry.h"
30
31struct buffer_reg_stream {
32 struct cds_list_head lnode;
33 union {
34 /* Original object data that MUST be copied over. */
35 struct lttng_ust_object_data *ust;
36 } obj;
37};
38
39struct buffer_reg_channel {
40 /* This key is the same as a tracing channel key. */
41 uint32_t key;
42 /* Key of the channel on the consumer side. */
43 uint64_t consumer_key;
44 /* Stream registry object of this channel registry. */
45 struct cds_list_head streams;
46 /* Total number of stream in the list. */
47 uint64_t stream_count;
48 /* Used to ensure mutual exclusion to the stream's list. */
49 pthread_mutex_t stream_list_lock;
50 /* Node for hash table usage. */
51 struct lttng_ht_node_u64 node;
52 union {
53 /* Original object data that MUST be copied over. */
54 struct lttng_ust_object_data *ust;
55 } obj;
56};
57
58struct buffer_reg_session {
59 /* Registry per domain. */
60 union {
61 struct ust_registry_session *ust;
62 } reg;
63
64 /* Contains buffer registry channel indexed by tracing channel key. */
65 struct lttng_ht *channels;
66};
67
68/*
69 * Registry object for per UID buffers.
70 */
71struct buffer_reg_uid {
72 /*
73 * Keys to match this object in a hash table. The following three variables
74 * identify a unique per UID buffer registry.
75 */
76 uint64_t session_id; /* Unique tracing session id. */
77 int bits_per_long; /* ABI */
78 uid_t uid; /* Owner. */
79
80 enum lttng_domain_type domain;
81 struct buffer_reg_session *registry;
82
83 /* Indexed by session id. */
84 struct lttng_ht_node_u64 node;
85 /* Node of a linked list used to teardown object at a destroy session. */
86 struct cds_list_head lnode;
87};
88
89/*
90 * Registry object for per PID buffers.
91 */
92struct buffer_reg_pid {
93 uint64_t session_id;
94
95 struct buffer_reg_session *registry;
96
97 /* Indexed by session id. */
98 struct lttng_ht_node_u64 node;
99};
100
101/* Buffer registry per UID. */
102void buffer_reg_init_uid_registry(void);
103int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid,
104 enum lttng_domain_type domain, struct buffer_reg_uid **regp);
105void buffer_reg_uid_add(struct buffer_reg_uid *reg);
106struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id,
107 uint32_t bits_per_long, uid_t uid);
108void buffer_reg_uid_remove(struct buffer_reg_uid *regp);
109void buffer_reg_uid_destroy(struct buffer_reg_uid *regp,
110 struct consumer_output *consumer);
111
112/* Buffer registry per PID. */
113void buffer_reg_init_pid_registry(void);
114int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp);
115void buffer_reg_pid_add(struct buffer_reg_pid *reg);
116struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id);
117void buffer_reg_pid_remove(struct buffer_reg_pid *regp);
118void buffer_reg_pid_destroy(struct buffer_reg_pid *regp);
119
120/* Channel */
121int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp);
122void buffer_reg_channel_add(struct buffer_reg_session *session,
123 struct buffer_reg_channel *channel);
124struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key,
125 struct buffer_reg_uid *reg);
126void buffer_reg_channel_remove(struct buffer_reg_session *session,
127 struct buffer_reg_channel *regp);
128void buffer_reg_channel_destroy(struct buffer_reg_channel *regp,
129 enum lttng_domain_type domain);
130
131/* Stream */
132int buffer_reg_stream_create(struct buffer_reg_stream **regp);
133void buffer_reg_stream_add(struct buffer_reg_stream *stream,
134 struct buffer_reg_channel *channel);
135void buffer_reg_stream_destroy(struct buffer_reg_stream *regp,
136 enum lttng_domain_type domain);
137
138/* Global registry. */
139void buffer_reg_destroy_registries(void);
140
141#endif /* LTTNG_BUFFER_REGISTRY_H */
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