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1c20f0e2 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 |
1c20f0e2 JD |
21 | #include <assert.h> |
22 | ||
23 | #include <common/common.h> | |
24 | #include <common/utils.h> | |
25 | ||
0a6518b0 | 26 | #include "lttng-relayd.h" |
1c20f0e2 JD |
27 | #include "index.h" |
28 | ||
29 | /* | |
30 | * Deferred free of a relay index object. MUST only be called by a call RCU. | |
31 | */ | |
32 | static void deferred_free_relay_index(struct rcu_head *head) | |
33 | { | |
34 | struct relay_index *index = | |
35 | caa_container_of(head, struct relay_index, rcu_node); | |
36 | ||
37 | if (index->to_close_fd >= 0) { | |
38 | int ret; | |
39 | ||
40 | ret = close(index->to_close_fd); | |
41 | if (ret < 0) { | |
42 | PERROR("Relay index to close fd %d", index->to_close_fd); | |
43 | } | |
44 | } | |
45 | ||
46 | relay_index_free(index); | |
47 | } | |
48 | ||
49 | /* | |
50 | * Allocate a new relay index object using the given stream ID and sequence | |
51 | * number as the hash table key. | |
52 | * | |
53 | * Return allocated object or else NULL on error. | |
54 | */ | |
55 | struct relay_index *relay_index_create(uint64_t stream_id, | |
56 | uint64_t net_seq_num) | |
57 | { | |
58 | struct relay_index *index; | |
59 | ||
60 | DBG2("Creating relay index with stream id %" PRIu64 " and seqnum %" PRIu64, | |
61 | stream_id, net_seq_num); | |
62 | ||
63 | index = zmalloc(sizeof(*index)); | |
64 | if (index == NULL) { | |
65 | PERROR("Relay index zmalloc"); | |
66 | goto error; | |
67 | } | |
68 | ||
69 | index->to_close_fd = -1; | |
70 | lttng_ht_node_init_two_u64(&index->index_n, stream_id, net_seq_num); | |
71 | ||
72 | error: | |
73 | return index; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Find a relayd index in the given hash table. | |
78 | * | |
79 | * Return index object or else NULL on error. | |
80 | */ | |
0a6518b0 | 81 | struct relay_index *relay_index_find(uint64_t stream_id, uint64_t net_seq_num) |
1c20f0e2 JD |
82 | { |
83 | struct lttng_ht_node_two_u64 *node; | |
84 | struct lttng_ht_iter iter; | |
85 | struct lttng_ht_two_u64 key; | |
86 | struct relay_index *index = NULL; | |
87 | ||
1c20f0e2 JD |
88 | DBG3("Finding index for stream id %" PRIu64 " and seq_num %" PRIu64, |
89 | stream_id, net_seq_num); | |
90 | ||
91 | key.key1 = stream_id; | |
92 | key.key2 = net_seq_num; | |
93 | ||
0a6518b0 | 94 | lttng_ht_lookup(indexes_ht, (void *)(&key), &iter); |
1c20f0e2 JD |
95 | node = lttng_ht_iter_get_node_two_u64(&iter); |
96 | if (node == NULL) { | |
97 | goto end; | |
98 | } | |
99 | index = caa_container_of(node, struct relay_index, index_n); | |
100 | ||
101 | end: | |
102 | DBG2("Index %sfound in HT for stream ID %" PRIu64 " and seqnum %" PRIu64, | |
103 | (index == NULL) ? "NOT " : "", stream_id, net_seq_num); | |
104 | return index; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Add unique relay index to the given hash table. In case of a collision, the | |
109 | * already existing object is put in the given _index variable. | |
110 | * | |
111 | * RCU read side lock MUST be acquired. | |
112 | */ | |
0a6518b0 | 113 | void relay_index_add(struct relay_index *index, struct relay_index **_index) |
1c20f0e2 JD |
114 | { |
115 | struct cds_lfht_node *node_ptr; | |
116 | ||
117 | assert(index); | |
1c20f0e2 JD |
118 | |
119 | DBG2("Adding relay index with stream id %" PRIu64 " and seqnum %" PRIu64, | |
5c32d0ae | 120 | index->index_n.key.key1, index->index_n.key.key2); |
1c20f0e2 | 121 | |
0a6518b0 DG |
122 | node_ptr = cds_lfht_add_unique(indexes_ht->ht, |
123 | indexes_ht->hash_fct((void *) &index->index_n.key, lttng_ht_seed), | |
124 | indexes_ht->match_fct, (void *) &index->index_n.key, | |
1c20f0e2 JD |
125 | &index->index_n.node); |
126 | if (node_ptr != &index->index_n.node) { | |
127 | *_index = caa_container_of(node_ptr, struct relay_index, index_n.node); | |
128 | } | |
129 | } | |
130 | ||
131 | /* | |
132 | * Write index on disk to the given fd. Once done error or not, it is removed | |
133 | * from the hash table and destroy the object. | |
134 | * | |
135 | * MUST be called with a RCU read side lock held. | |
136 | * | |
137 | * Return 0 on success else a negative value. | |
138 | */ | |
0a6518b0 | 139 | int relay_index_write(int fd, struct relay_index *index) |
1c20f0e2 JD |
140 | { |
141 | int ret; | |
142 | struct lttng_ht_iter iter; | |
143 | ||
144 | DBG2("Writing index for stream ID %" PRIu64 " and seq num %" PRIu64 | |
5c32d0ae JD |
145 | " on fd %d", index->index_n.key.key1, |
146 | index->index_n.key.key2, fd); | |
1c20f0e2 JD |
147 | |
148 | /* Delete index from hash table. */ | |
149 | iter.iter.node = &index->index_n.node; | |
0a6518b0 | 150 | ret = lttng_ht_del(indexes_ht, &iter); |
1c20f0e2 JD |
151 | assert(!ret); |
152 | call_rcu(&index->rcu_node, deferred_free_relay_index); | |
153 | ||
154 | return index_write(fd, &index->index_data, sizeof(index->index_data)); | |
155 | } | |
156 | ||
157 | /* | |
158 | * Free the given index. | |
159 | */ | |
160 | void relay_index_free(struct relay_index *index) | |
161 | { | |
162 | free(index); | |
163 | } | |
164 | ||
165 | /* | |
166 | * Safely free the given index using a call RCU. | |
167 | */ | |
168 | void relay_index_free_safe(struct relay_index *index) | |
169 | { | |
170 | if (!index) { | |
171 | return; | |
172 | } | |
173 | ||
174 | call_rcu(&index->rcu_node, deferred_free_relay_index); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Delete index from the given hash table. | |
179 | * | |
180 | * RCU read side lock MUST be acquired. | |
181 | */ | |
0a6518b0 | 182 | void relay_index_delete(struct relay_index *index) |
1c20f0e2 JD |
183 | { |
184 | int ret; | |
185 | struct lttng_ht_iter iter; | |
186 | ||
187 | DBG3("Relay index with stream ID %" PRIu64 " and seq num %" PRIu64 | |
5c32d0ae JD |
188 | " deleted.", index->index_n.key.key1, |
189 | index->index_n.key.key2); | |
1c20f0e2 JD |
190 | |
191 | /* Delete index from hash table. */ | |
192 | iter.iter.node = &index->index_n.node; | |
0a6518b0 | 193 | ret = lttng_ht_del(indexes_ht, &iter); |
1c20f0e2 JD |
194 | assert(!ret); |
195 | } | |
196 | ||
197 | /* | |
198 | * Destroy every relay index with the given stream id as part of the key. | |
199 | */ | |
0a6518b0 | 200 | void relay_index_destroy_by_stream_id(uint64_t stream_id) |
1c20f0e2 JD |
201 | { |
202 | struct lttng_ht_iter iter; | |
203 | struct relay_index *index; | |
204 | ||
1c20f0e2 | 205 | rcu_read_lock(); |
0a6518b0 | 206 | cds_lfht_for_each_entry(indexes_ht->ht, &iter.iter, index, index_n.node) { |
5c32d0ae | 207 | if (index->index_n.key.key1 == stream_id) { |
0a6518b0 | 208 | relay_index_delete(index); |
1c20f0e2 JD |
209 | relay_index_free_safe(index); |
210 | } | |
211 | } | |
212 | rcu_read_unlock(); | |
213 | } |