| 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 |
| 20 | #include <assert.h> |
| 21 | |
| 22 | #include <common/common.h> |
| 23 | #include <common/utils.h> |
| 24 | |
| 25 | #include "ctf-trace.h" |
| 26 | #include "lttng-relayd.h" |
| 27 | #include "stream.h" |
| 28 | |
| 29 | static uint64_t last_relay_ctf_trace_id; |
| 30 | |
| 31 | static void rcu_destroy_ctf_trace(struct rcu_head *head) |
| 32 | { |
| 33 | struct lttng_ht_node_str *node = |
| 34 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 35 | struct ctf_trace *trace= |
| 36 | caa_container_of(node, struct ctf_trace, node); |
| 37 | |
| 38 | free(trace); |
| 39 | } |
| 40 | |
| 41 | /* |
| 42 | * Destroy a ctf trace and all stream contained in it. |
| 43 | * |
| 44 | * MUST be called with the RCU read side lock. |
| 45 | */ |
| 46 | void ctf_trace_destroy(struct ctf_trace *obj) |
| 47 | { |
| 48 | struct relay_stream *stream, *tmp_stream; |
| 49 | |
| 50 | assert(obj); |
| 51 | /* |
| 52 | * Getting to this point, every stream referenced to that object have put |
| 53 | * back their ref since the've been closed by the control side. |
| 54 | */ |
| 55 | assert(!obj->refcount); |
| 56 | |
| 57 | cds_list_for_each_entry_safe(stream, tmp_stream, &obj->stream_list, |
| 58 | trace_list) { |
| 59 | stream_delete(relay_streams_ht, stream); |
| 60 | stream_destroy(stream); |
| 61 | } |
| 62 | |
| 63 | call_rcu(&obj->node.head, rcu_destroy_ctf_trace); |
| 64 | } |
| 65 | |
| 66 | void ctf_trace_try_destroy(struct relay_session *session, |
| 67 | struct ctf_trace *ctf_trace) |
| 68 | { |
| 69 | assert(session); |
| 70 | assert(ctf_trace); |
| 71 | |
| 72 | /* |
| 73 | * Considering no viewer attach to the session and the trace having no more |
| 74 | * stream attached, wipe the trace. |
| 75 | */ |
| 76 | if (uatomic_read(&session->viewer_refcount) == 0 && |
| 77 | uatomic_read(&ctf_trace->refcount) == 0) { |
| 78 | ctf_trace_delete(session->ctf_traces_ht, ctf_trace); |
| 79 | ctf_trace_destroy(ctf_trace); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | /* |
| 84 | * Create and return an allocated ctf_trace object. NULL on error. |
| 85 | */ |
| 86 | struct ctf_trace *ctf_trace_create(char *path_name) |
| 87 | { |
| 88 | struct ctf_trace *obj; |
| 89 | |
| 90 | assert(path_name); |
| 91 | |
| 92 | obj = zmalloc(sizeof(*obj)); |
| 93 | if (!obj) { |
| 94 | PERROR("ctf_trace alloc"); |
| 95 | goto error; |
| 96 | } |
| 97 | |
| 98 | CDS_INIT_LIST_HEAD(&obj->stream_list); |
| 99 | |
| 100 | obj->id = ++last_relay_ctf_trace_id; |
| 101 | lttng_ht_node_init_str(&obj->node, path_name); |
| 102 | |
| 103 | DBG("Created ctf_trace %" PRIu64 " with path: %s", obj->id, path_name); |
| 104 | |
| 105 | error: |
| 106 | return obj; |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Return a ctf_trace object if found by id in the given hash table else NULL. |
| 111 | */ |
| 112 | struct ctf_trace *ctf_trace_find_by_path(struct lttng_ht *ht, |
| 113 | char *path_name) |
| 114 | { |
| 115 | struct lttng_ht_node_str *node; |
| 116 | struct lttng_ht_iter iter; |
| 117 | struct ctf_trace *trace = NULL; |
| 118 | |
| 119 | assert(ht); |
| 120 | |
| 121 | lttng_ht_lookup(ht, (void *) path_name, &iter); |
| 122 | node = lttng_ht_iter_get_node_str(&iter); |
| 123 | if (!node) { |
| 124 | DBG("CTF Trace path %s not found", path_name); |
| 125 | goto end; |
| 126 | } |
| 127 | trace = caa_container_of(node, struct ctf_trace, node); |
| 128 | |
| 129 | end: |
| 130 | return trace; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * Add stream to a given hash table. |
| 135 | */ |
| 136 | void ctf_trace_add(struct lttng_ht *ht, struct ctf_trace *trace) |
| 137 | { |
| 138 | assert(ht); |
| 139 | assert(trace); |
| 140 | |
| 141 | lttng_ht_add_str(ht, &trace->node); |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Delete stream from a given hash table. |
| 146 | */ |
| 147 | void ctf_trace_delete(struct lttng_ht *ht, struct ctf_trace *trace) |
| 148 | { |
| 149 | int ret; |
| 150 | struct lttng_ht_iter iter; |
| 151 | |
| 152 | assert(ht); |
| 153 | assert(trace); |
| 154 | |
| 155 | iter.iter.node = &trace->node.node; |
| 156 | ret = lttng_ht_del(ht, &iter); |
| 157 | assert(!ret); |
| 158 | } |