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