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d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
6c1c0768 | 20 | #define _LGPL_SOURCE |
d3e2ba59 JD |
21 | #include <assert.h> |
22 | ||
23 | #include <common/common.h> | |
24 | #include <common/utils.h> | |
25 | ||
26 | #include "ctf-trace.h" | |
2a174661 DG |
27 | #include "lttng-relayd.h" |
28 | #include "stream.h" | |
d3e2ba59 JD |
29 | |
30 | static uint64_t last_relay_ctf_trace_id; | |
31 | ||
2a174661 DG |
32 | static void rcu_destroy_ctf_trace(struct rcu_head *head) |
33 | { | |
34 | struct lttng_ht_node_str *node = | |
35 | caa_container_of(head, struct lttng_ht_node_str, head); | |
36 | struct ctf_trace *trace= | |
37 | caa_container_of(node, struct ctf_trace, node); | |
38 | ||
39 | free(trace); | |
40 | } | |
41 | ||
f238ce89 JG |
42 | static void rcu_destroy_stream(struct rcu_head *head) |
43 | { | |
44 | struct relay_stream *stream = | |
45 | caa_container_of(head, struct relay_stream, rcu_node); | |
46 | ||
47 | stream_destroy(stream); | |
48 | } | |
49 | ||
d3e2ba59 | 50 | /* |
2a174661 DG |
51 | * Destroy a ctf trace and all stream contained in it. |
52 | * | |
53 | * MUST be called with the RCU read side lock. | |
d3e2ba59 | 54 | */ |
2a174661 | 55 | void ctf_trace_destroy(struct ctf_trace *obj) |
d3e2ba59 | 56 | { |
2a174661 DG |
57 | struct relay_stream *stream, *tmp_stream; |
58 | ||
59 | assert(obj); | |
60 | /* | |
61 | * Getting to this point, every stream referenced to that object have put | |
62 | * back their ref since the've been closed by the control side. | |
63 | */ | |
64 | assert(!obj->refcount); | |
65 | ||
66 | cds_list_for_each_entry_safe(stream, tmp_stream, &obj->stream_list, | |
67 | trace_list) { | |
68 | stream_delete(relay_streams_ht, stream); | |
f238ce89 | 69 | call_rcu(&stream->rcu_node, rcu_destroy_stream); |
d3e2ba59 JD |
70 | } |
71 | ||
2a174661 DG |
72 | call_rcu(&obj->node.head, rcu_destroy_ctf_trace); |
73 | } | |
74 | ||
75 | void ctf_trace_try_destroy(struct relay_session *session, | |
76 | struct ctf_trace *ctf_trace) | |
77 | { | |
78 | assert(session); | |
79 | assert(ctf_trace); | |
80 | ||
81 | /* | |
82 | * Considering no viewer attach to the session and the trace having no more | |
83 | * stream attached, wipe the trace. | |
84 | */ | |
85 | if (uatomic_read(&session->viewer_refcount) == 0 && | |
86 | uatomic_read(&ctf_trace->refcount) == 0) { | |
c46bab29 | 87 | ctf_trace_delete(session->ctf_traces_ht, ctf_trace); |
2a174661 | 88 | ctf_trace_destroy(ctf_trace); |
d3e2ba59 JD |
89 | } |
90 | } | |
91 | ||
92 | /* | |
93 | * Create and return an allocated ctf_trace object. NULL on error. | |
94 | */ | |
2a174661 | 95 | struct ctf_trace *ctf_trace_create(char *path_name) |
d3e2ba59 JD |
96 | { |
97 | struct ctf_trace *obj; | |
98 | ||
2a174661 DG |
99 | assert(path_name); |
100 | ||
d3e2ba59 JD |
101 | obj = zmalloc(sizeof(*obj)); |
102 | if (!obj) { | |
103 | PERROR("ctf_trace alloc"); | |
104 | goto error; | |
105 | } | |
106 | ||
2a174661 DG |
107 | CDS_INIT_LIST_HEAD(&obj->stream_list); |
108 | ||
d3e2ba59 | 109 | obj->id = ++last_relay_ctf_trace_id; |
2a174661 DG |
110 | lttng_ht_node_init_str(&obj->node, path_name); |
111 | ||
112 | DBG("Created ctf_trace %" PRIu64 " with path: %s", obj->id, path_name); | |
d3e2ba59 JD |
113 | |
114 | error: | |
115 | return obj; | |
116 | } | |
117 | ||
118 | /* | |
2a174661 | 119 | * Return a ctf_trace object if found by id in the given hash table else NULL. |
fd1ed0d9 JG |
120 | * |
121 | * Must be called with rcu_read_lock() taken. | |
d3e2ba59 | 122 | */ |
2a174661 DG |
123 | struct ctf_trace *ctf_trace_find_by_path(struct lttng_ht *ht, |
124 | char *path_name) | |
d3e2ba59 | 125 | { |
2a174661 | 126 | struct lttng_ht_node_str *node; |
d3e2ba59 | 127 | struct lttng_ht_iter iter; |
2a174661 | 128 | struct ctf_trace *trace = NULL; |
d3e2ba59 JD |
129 | |
130 | assert(ht); | |
2a174661 DG |
131 | |
132 | lttng_ht_lookup(ht, (void *) path_name, &iter); | |
133 | node = lttng_ht_iter_get_node_str(&iter); | |
134 | if (!node) { | |
135 | DBG("CTF Trace path %s not found", path_name); | |
136 | goto end; | |
d3e2ba59 | 137 | } |
2a174661 | 138 | trace = caa_container_of(node, struct ctf_trace, node); |
d3e2ba59 JD |
139 | |
140 | end: | |
2a174661 | 141 | return trace; |
d3e2ba59 JD |
142 | } |
143 | ||
2a174661 DG |
144 | /* |
145 | * Add stream to a given hash table. | |
146 | */ | |
147 | void ctf_trace_add(struct lttng_ht *ht, struct ctf_trace *trace) | |
148 | { | |
149 | assert(ht); | |
150 | assert(trace); | |
151 | ||
152 | lttng_ht_add_str(ht, &trace->node); | |
153 | } | |
154 | ||
155 | /* | |
156 | * Delete stream from a given hash table. | |
157 | */ | |
158 | void ctf_trace_delete(struct lttng_ht *ht, struct ctf_trace *trace) | |
159 | { | |
160 | int ret; | |
161 | struct lttng_ht_iter iter; | |
162 | ||
163 | assert(ht); | |
164 | assert(trace); | |
165 | ||
166 | iter.iter.node = &trace->node.node; | |
167 | ret = lttng_ht_del(ht, &iter); | |
168 | assert(!ret); | |
169 | } |