Commit | Line | Data |
---|---|---|
a8c3ad3e | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2018 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
159b042f | 3 | * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
a8c3ad3e | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
a8c3ad3e | 6 | * |
a8c3ad3e MD |
7 | */ |
8 | ||
159b042f | 9 | #include "lttng/tracker.h" |
c9e313bc SM |
10 | #include "common/dynamic-array.hpp" |
11 | #include "common/macros.hpp" | |
a8c3ad3e MD |
12 | #define _LGPL_SOURCE |
13 | #include <grp.h> | |
14 | #include <pwd.h> | |
15 | #include <sys/types.h> | |
16 | #include <unistd.h> | |
159b042f JG |
17 | #include <urcu.h> |
18 | #include <urcu/list.h> | |
19 | #include <urcu/rculfhash.h> | |
a8c3ad3e | 20 | |
c9e313bc SM |
21 | #include "tracker.hpp" |
22 | #include <common/defaults.hpp> | |
23 | #include <common/error.hpp> | |
24 | #include <common/hashtable/hashtable.hpp> | |
25 | #include <common/hashtable/utils.hpp> | |
26 | #include <common/tracker.hpp> | |
a8c3ad3e MD |
27 | #include <lttng/lttng-error.h> |
28 | ||
f1494934 JG |
29 | struct process_attr_tracker { |
30 | enum lttng_tracking_policy policy; | |
31 | struct cds_lfht *inclusion_set_ht; | |
32 | }; | |
33 | ||
34 | namespace { | |
159b042f JG |
35 | struct process_attr_tracker_value_node { |
36 | struct process_attr_value *value; | |
37 | struct cds_lfht_node inclusion_set_ht_node; | |
38 | struct rcu_head rcu_head; | |
39 | }; | |
f1494934 | 40 | } /* namespace */ |
159b042f JG |
41 | |
42 | static void process_attr_tracker_value_node_rcu_free(struct rcu_head *rcu_head) | |
43 | { | |
44 | struct process_attr_tracker_value_node *node = | |
45 | container_of(rcu_head, typeof(*node), rcu_head); | |
46 | ||
47 | free(node); | |
48 | } | |
49 | ||
50 | struct process_attr_tracker *process_attr_tracker_create(void) | |
a8c3ad3e | 51 | { |
159b042f | 52 | struct process_attr_tracker *tracker; |
a8c3ad3e | 53 | |
64803277 | 54 | tracker = zmalloc<process_attr_tracker>(); |
159b042f | 55 | if (!tracker) { |
a8c3ad3e MD |
56 | return NULL; |
57 | } | |
159b042f JG |
58 | |
59 | (void) process_attr_tracker_set_tracking_policy( | |
60 | tracker, LTTNG_TRACKING_POLICY_INCLUDE_ALL); | |
61 | ||
62 | tracker->inclusion_set_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, | |
a8c3ad3e | 63 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
159b042f | 64 | if (!tracker->inclusion_set_ht) { |
a8c3ad3e MD |
65 | goto error; |
66 | } | |
a8c3ad3e | 67 | |
159b042f | 68 | return tracker; |
a8c3ad3e | 69 | error: |
159b042f | 70 | process_attr_tracker_destroy(tracker); |
a8c3ad3e MD |
71 | return NULL; |
72 | } | |
73 | ||
159b042f JG |
74 | static void process_attr_tracker_remove_value_node( |
75 | struct process_attr_tracker *tracker, | |
76 | struct process_attr_tracker_value_node *value_node) | |
a8c3ad3e | 77 | { |
159b042f JG |
78 | cds_lfht_del(tracker->inclusion_set_ht, |
79 | &value_node->inclusion_set_ht_node); | |
80 | process_attr_value_destroy(value_node->value); | |
81 | call_rcu(&value_node->rcu_head, | |
82 | process_attr_tracker_value_node_rcu_free); | |
a8c3ad3e MD |
83 | } |
84 | ||
159b042f JG |
85 | static void process_attr_tracker_clear_inclusion_set( |
86 | struct process_attr_tracker *tracker) | |
a8c3ad3e | 87 | { |
159b042f JG |
88 | int ret; |
89 | struct lttng_ht_iter iter; | |
90 | struct process_attr_tracker_value_node *value_node; | |
a8c3ad3e | 91 | |
159b042f JG |
92 | if (!tracker->inclusion_set_ht) { |
93 | return; | |
94 | } | |
a8c3ad3e | 95 | |
159b042f JG |
96 | rcu_read_lock(); |
97 | cds_lfht_for_each_entry (tracker->inclusion_set_ht, &iter.iter, | |
98 | value_node, inclusion_set_ht_node) { | |
99 | process_attr_tracker_remove_value_node(tracker, value_node); | |
a8c3ad3e | 100 | } |
159b042f JG |
101 | rcu_read_unlock(); |
102 | ret = cds_lfht_destroy(tracker->inclusion_set_ht, NULL); | |
a0377dfe | 103 | LTTNG_ASSERT(ret == 0); |
159b042f | 104 | tracker->inclusion_set_ht = NULL; |
a8c3ad3e MD |
105 | } |
106 | ||
159b042f JG |
107 | static int process_attr_tracker_create_inclusion_set( |
108 | struct process_attr_tracker *tracker) | |
a8c3ad3e | 109 | { |
a0377dfe | 110 | LTTNG_ASSERT(!tracker->inclusion_set_ht); |
159b042f JG |
111 | tracker->inclusion_set_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
112 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
113 | return tracker->inclusion_set_ht ? 0 : -1; | |
a8c3ad3e MD |
114 | } |
115 | ||
159b042f | 116 | void process_attr_tracker_destroy(struct process_attr_tracker *tracker) |
a8c3ad3e | 117 | { |
159b042f JG |
118 | if (!tracker) { |
119 | return; | |
120 | } | |
a8c3ad3e | 121 | |
159b042f JG |
122 | process_attr_tracker_clear_inclusion_set(tracker); |
123 | free(tracker); | |
a8c3ad3e MD |
124 | } |
125 | ||
159b042f JG |
126 | enum lttng_tracking_policy process_attr_tracker_get_tracking_policy( |
127 | const struct process_attr_tracker *tracker) | |
a8c3ad3e | 128 | { |
159b042f | 129 | return tracker->policy; |
a8c3ad3e MD |
130 | } |
131 | ||
159b042f JG |
132 | int process_attr_tracker_set_tracking_policy( |
133 | struct process_attr_tracker *tracker, | |
134 | enum lttng_tracking_policy tracking_policy) | |
a8c3ad3e | 135 | { |
159b042f | 136 | int ret = 0; |
a8c3ad3e | 137 | |
159b042f JG |
138 | if (tracker->policy == tracking_policy) { |
139 | goto end; | |
a8c3ad3e | 140 | } |
2d97a006 | 141 | |
159b042f JG |
142 | process_attr_tracker_clear_inclusion_set(tracker); |
143 | ret = process_attr_tracker_create_inclusion_set(tracker); | |
144 | if (ret) { | |
145 | goto end; | |
a8c3ad3e | 146 | } |
159b042f JG |
147 | tracker->policy = tracking_policy; |
148 | end: | |
a8c3ad3e MD |
149 | return ret; |
150 | } | |
151 | ||
159b042f JG |
152 | static int match_inclusion_set_value( |
153 | struct cds_lfht_node *node, const void *key) | |
a8c3ad3e | 154 | { |
7966af57 | 155 | const struct process_attr_value *value_key = (process_attr_value *) key; |
159b042f JG |
156 | const struct process_attr_tracker_value_node *value_node = |
157 | caa_container_of(node, | |
158 | struct process_attr_tracker_value_node, | |
159 | inclusion_set_ht_node); | |
a8c3ad3e | 160 | |
159b042f JG |
161 | return process_attr_tracker_value_equal(value_node->value, value_key); |
162 | } | |
a8c3ad3e | 163 | |
159b042f JG |
164 | static struct process_attr_tracker_value_node *process_attr_tracker_lookup( |
165 | const struct process_attr_tracker *tracker, | |
166 | const struct process_attr_value *value) | |
167 | { | |
168 | struct cds_lfht_iter iter; | |
169 | struct cds_lfht_node *node; | |
a8c3ad3e | 170 | |
a0377dfe | 171 | LTTNG_ASSERT(tracker->policy == LTTNG_TRACKING_POLICY_INCLUDE_SET); |
159b042f JG |
172 | |
173 | rcu_read_lock(); | |
174 | cds_lfht_lookup(tracker->inclusion_set_ht, | |
175 | process_attr_value_hash(value), | |
176 | match_inclusion_set_value, value, &iter); | |
177 | node = cds_lfht_iter_get_node(&iter); | |
a8c3ad3e | 178 | rcu_read_unlock(); |
159b042f JG |
179 | |
180 | return node ? container_of(node, struct process_attr_tracker_value_node, | |
181 | inclusion_set_ht_node) : | |
182 | NULL; | |
a8c3ad3e MD |
183 | } |
184 | ||
159b042f JG |
185 | /* Protected by session mutex held by caller. */ |
186 | enum process_attr_tracker_status process_attr_tracker_inclusion_set_add_value( | |
187 | struct process_attr_tracker *tracker, | |
188 | const struct process_attr_value *value) | |
a8c3ad3e | 189 | { |
159b042f JG |
190 | enum process_attr_tracker_status status = |
191 | PROCESS_ATTR_TRACKER_STATUS_OK; | |
192 | struct process_attr_value *value_copy = NULL; | |
193 | struct process_attr_tracker_value_node *value_node = NULL; | |
b7e1aba3 | 194 | |
159b042f JG |
195 | rcu_read_lock(); |
196 | if (tracker->policy != LTTNG_TRACKING_POLICY_INCLUDE_SET) { | |
197 | status = PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY; | |
198 | goto end; | |
a8c3ad3e | 199 | } |
a8c3ad3e | 200 | |
159b042f JG |
201 | if (process_attr_tracker_lookup(tracker, value)) { |
202 | status = PROCESS_ATTR_TRACKER_STATUS_EXISTS; | |
a8c3ad3e MD |
203 | goto end; |
204 | } | |
a8c3ad3e | 205 | |
64803277 | 206 | value_node = zmalloc<process_attr_tracker_value_node>(); |
159b042f JG |
207 | if (!value_node) { |
208 | status = PROCESS_ATTR_TRACKER_STATUS_ERROR; | |
209 | goto end; | |
a8c3ad3e | 210 | } |
159b042f JG |
211 | |
212 | value_copy = process_attr_value_copy(value); | |
213 | if (!value_copy) { | |
214 | status = PROCESS_ATTR_TRACKER_STATUS_ERROR; | |
a8c3ad3e MD |
215 | goto end; |
216 | } | |
159b042f JG |
217 | |
218 | value_node->value = value_copy; | |
219 | cds_lfht_add(tracker->inclusion_set_ht, | |
220 | process_attr_value_hash(value_copy), | |
221 | &value_node->inclusion_set_ht_node); | |
222 | value_copy = NULL; | |
223 | value_node = NULL; | |
224 | end: | |
225 | if (value_copy) { | |
226 | process_attr_value_destroy(value_copy); | |
a8c3ad3e | 227 | } |
159b042f JG |
228 | if (value_node) { |
229 | free(value_node); | |
a8c3ad3e | 230 | } |
159b042f JG |
231 | rcu_read_unlock(); |
232 | return status; | |
a8c3ad3e MD |
233 | } |
234 | ||
159b042f JG |
235 | /* Protected by session mutex held by caller. */ |
236 | enum process_attr_tracker_status | |
237 | process_attr_tracker_inclusion_set_remove_value( | |
238 | struct process_attr_tracker *tracker, | |
239 | const struct process_attr_value *value) | |
a8c3ad3e | 240 | { |
159b042f JG |
241 | struct process_attr_tracker_value_node *value_node; |
242 | enum process_attr_tracker_status status = | |
243 | PROCESS_ATTR_TRACKER_STATUS_OK; | |
a8c3ad3e | 244 | |
159b042f JG |
245 | rcu_read_lock(); |
246 | if (tracker->policy != LTTNG_TRACKING_POLICY_INCLUDE_SET) { | |
247 | status = PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY; | |
248 | goto end; | |
249 | } | |
a7a533cd | 250 | |
159b042f JG |
251 | value_node = process_attr_tracker_lookup(tracker, value); |
252 | if (!value_node) { | |
253 | status = PROCESS_ATTR_TRACKER_STATUS_MISSING; | |
254 | goto end; | |
a8c3ad3e | 255 | } |
a7a533cd | 256 | |
159b042f | 257 | process_attr_tracker_remove_value_node(tracker, value_node); |
a8c3ad3e | 258 | end: |
159b042f JG |
259 | rcu_read_unlock(); |
260 | return status; | |
a8c3ad3e MD |
261 | } |
262 | ||
159b042f JG |
263 | enum process_attr_tracker_status process_attr_tracker_get_inclusion_set( |
264 | const struct process_attr_tracker *tracker, | |
265 | struct lttng_process_attr_values **_values) | |
a8c3ad3e | 266 | { |
159b042f JG |
267 | struct lttng_ht_iter iter; |
268 | struct process_attr_tracker_value_node *value_node; | |
269 | enum process_attr_tracker_status status = | |
270 | PROCESS_ATTR_TRACKER_STATUS_OK; | |
271 | struct lttng_process_attr_values *values; | |
272 | struct process_attr_value *new_value = NULL; | |
273 | ||
274 | values = lttng_process_attr_values_create(); | |
275 | if (!values) { | |
276 | status = PROCESS_ATTR_TRACKER_STATUS_ERROR; | |
277 | goto error; | |
e283e4a0 | 278 | } |
a7a533cd | 279 | |
159b042f JG |
280 | if (tracker->policy != LTTNG_TRACKING_POLICY_INCLUDE_SET) { |
281 | status = PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY; | |
282 | goto error; | |
a8c3ad3e | 283 | } |
a7a533cd | 284 | |
159b042f JG |
285 | rcu_read_lock(); |
286 | cds_lfht_for_each_entry (tracker->inclusion_set_ht, &iter.iter, | |
287 | value_node, inclusion_set_ht_node) { | |
288 | int ret; | |
289 | ||
290 | new_value = process_attr_value_copy(value_node->value); | |
291 | if (!new_value) { | |
292 | status = PROCESS_ATTR_TRACKER_STATUS_ERROR; | |
293 | goto error_unlock; | |
a7a533cd | 294 | } |
a7a533cd | 295 | |
159b042f JG |
296 | ret = lttng_dynamic_pointer_array_add_pointer( |
297 | &values->array, new_value); | |
298 | if (ret) { | |
299 | status = PROCESS_ATTR_TRACKER_STATUS_ERROR; | |
300 | goto error_unlock; | |
a8c3ad3e | 301 | } |
159b042f JG |
302 | |
303 | new_value = NULL; | |
a8c3ad3e | 304 | } |
159b042f JG |
305 | rcu_read_unlock(); |
306 | *_values = values; | |
307 | return status; | |
308 | error_unlock: | |
309 | rcu_read_unlock(); | |
310 | error: | |
311 | lttng_process_attr_values_destroy(values); | |
312 | process_attr_value_destroy(new_value); | |
313 | return status; | |
a8c3ad3e | 314 | } |