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1 | /* |
2 | * Copyright (C) 2019 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this program; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
18 | #ifndef LTTNG_TRACE_CHUNK_H | |
19 | #define LTTNG_TRACE_CHUNK_H | |
20 | ||
21 | #include <common/macros.h> | |
22 | #include <common/credentials.h> | |
23 | #include <common/compat/directory-handle.h> | |
24 | #include <stddef.h> | |
25 | #include <stdint.h> | |
26 | #include <stdbool.h> | |
27 | ||
28 | /* | |
29 | * A trace chunk is a group of directories and files forming a (or a set of) | |
30 | * complete and independant trace(s). For instance, a trace archive chunk, | |
31 | * a snapshot, or a regular LTTng trace are all instances of a trace archive. | |
32 | * | |
33 | * A trace chunk is always contained within a session output directory. | |
34 | * | |
35 | * This facility is used by the session daemon, consumer daemon(s), and relay | |
36 | * daemon to: | |
37 | * - Control file (data stream, metadata, and index) creation relative to | |
38 | * a given output directory, | |
39 | * - Track the use of an output directory by other objects in order to | |
40 | * know if/when an output directory can be safely consumed, renamed, | |
41 | * deleted, etc. | |
42 | * | |
43 | * | |
44 | * OWNER VS USER | |
45 | * --- | |
46 | * | |
47 | * A trace chunk can either be a owner or a user of its | |
48 | * "chunk output directory". | |
49 | * | |
50 | * A "user" trace chunk is provided with a handle to the chunk output directory | |
51 | * which can then be used to create subdirectories and files. | |
52 | * | |
53 | * An "owner" chunk, on top of being able to perform the operations of a "user" | |
54 | * chunk can perform operations on its chunk output directory, such as renaming | |
55 | * or deleting it. | |
56 | * | |
57 | * A trace chunk becomes an "owner" or "user" chunk based on which of | |
58 | * 'lttng_trace_chunk_set_as_owner()' or 'lttng_trace_chunk_set_as_user()' is | |
59 | * used. These methods are _exclusive_ and must only be used once on a | |
60 | * trace chunk. | |
61 | */ | |
62 | ||
63 | struct lttng_trace_chunk; | |
64 | ||
65 | enum lttng_trace_chunk_status { | |
66 | LTTNG_TRACE_CHUNK_STATUS_OK, | |
67 | LTTNG_TRACE_CHUNK_STATUS_NONE, | |
68 | LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT, | |
69 | LTTNG_TRACE_CHUNK_STATUS_INVALID_OPERATION, | |
70 | LTTNG_TRACE_CHUNK_STATUS_ERROR, | |
71 | }; | |
72 | ||
73 | enum lttng_trace_chunk_command_type { | |
74 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED = 0, | |
75 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MAX | |
76 | }; | |
77 | ||
78 | LTTNG_HIDDEN | |
79 | struct lttng_trace_chunk *lttng_trace_chunk_create_anonymous(void); | |
80 | ||
81 | LTTNG_HIDDEN | |
82 | struct lttng_trace_chunk *lttng_trace_chunk_create( | |
83 | uint64_t chunk_id, | |
84 | time_t chunk_creation_time); | |
85 | ||
86 | LTTNG_HIDDEN | |
87 | enum lttng_trace_chunk_status lttng_trace_chunk_get_id( | |
88 | struct lttng_trace_chunk *chunk, uint64_t *id); | |
89 | ||
90 | LTTNG_HIDDEN | |
91 | enum lttng_trace_chunk_status lttng_trace_chunk_get_creation_timestamp( | |
92 | struct lttng_trace_chunk *chunk, time_t *creation_ts); | |
93 | ||
94 | LTTNG_HIDDEN | |
95 | enum lttng_trace_chunk_status lttng_trace_chunk_get_close_timestamp( | |
96 | struct lttng_trace_chunk *chunk, time_t *close_ts); | |
97 | ||
98 | LTTNG_HIDDEN | |
99 | enum lttng_trace_chunk_status lttng_trace_chunk_set_close_timestamp( | |
100 | struct lttng_trace_chunk *chunk, time_t close_ts); | |
101 | ||
102 | LTTNG_HIDDEN | |
103 | enum lttng_trace_chunk_status lttng_trace_chunk_get_name( | |
104 | struct lttng_trace_chunk *chunk, const char **name, | |
913a542b | 105 | bool *name_overridden); |
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106 | |
107 | LTTNG_HIDDEN | |
108 | enum lttng_trace_chunk_status lttng_trace_chunk_override_name( | |
109 | struct lttng_trace_chunk *chunk, const char *name); | |
110 | ||
111 | LTTNG_HIDDEN | |
112 | enum lttng_trace_chunk_status lttng_trace_chunk_get_credentials( | |
113 | struct lttng_trace_chunk *chunk, | |
114 | struct lttng_credentials *credentials); | |
115 | ||
116 | LTTNG_HIDDEN | |
117 | enum lttng_trace_chunk_status lttng_trace_chunk_set_credentials( | |
118 | struct lttng_trace_chunk *chunk, | |
119 | const struct lttng_credentials *credentials); | |
120 | ||
121 | LTTNG_HIDDEN | |
122 | enum lttng_trace_chunk_status lttng_trace_chunk_set_credentials_current_user( | |
123 | struct lttng_trace_chunk *chunk); | |
124 | ||
125 | /* session_output_directory ownership is transferred to the chunk on success. */ | |
126 | LTTNG_HIDDEN | |
127 | enum lttng_trace_chunk_status lttng_trace_chunk_set_as_owner( | |
128 | struct lttng_trace_chunk *chunk, | |
129 | struct lttng_directory_handle *session_output_directory); | |
130 | ||
131 | /* chunk_output_directory ownership is transferred to the chunk on success. */ | |
132 | LTTNG_HIDDEN | |
133 | enum lttng_trace_chunk_status lttng_trace_chunk_set_as_user( | |
134 | struct lttng_trace_chunk *chunk, | |
135 | struct lttng_directory_handle *chunk_directory); | |
136 | ||
137 | LTTNG_HIDDEN | |
138 | enum lttng_trace_chunk_status lttng_trace_chunk_get_chunk_directory_handle( | |
139 | struct lttng_trace_chunk *chunk, | |
140 | const struct lttng_directory_handle **handle); | |
141 | ||
142 | LTTNG_HIDDEN | |
143 | enum lttng_trace_chunk_status lttng_trace_chunk_create_subdirectory( | |
144 | struct lttng_trace_chunk *chunk, | |
145 | const char *subdirectory_path); | |
146 | ||
147 | LTTNG_HIDDEN | |
148 | enum lttng_trace_chunk_status lttng_trace_chunk_open_file( | |
149 | struct lttng_trace_chunk *chunk, const char *filename, | |
150 | int flags, mode_t mode, int *out_fd); | |
151 | ||
152 | LTTNG_HIDDEN | |
153 | int lttng_trace_chunk_unlink_file(struct lttng_trace_chunk *chunk, | |
154 | const char *filename); | |
155 | ||
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156 | LTTNG_HIDDEN |
157 | enum lttng_trace_chunk_status lttng_trace_chunk_get_close_command( | |
158 | struct lttng_trace_chunk *chunk, | |
159 | enum lttng_trace_chunk_command_type *command_type); | |
160 | ||
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161 | LTTNG_HIDDEN |
162 | enum lttng_trace_chunk_status lttng_trace_chunk_set_close_command( | |
163 | struct lttng_trace_chunk *chunk, | |
164 | enum lttng_trace_chunk_command_type command_type); | |
165 | ||
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166 | LTTNG_HIDDEN |
167 | const char *lttng_trace_chunk_command_type_get_name( | |
168 | enum lttng_trace_chunk_command_type command); | |
169 | ||
2c5ff4e4 JG |
170 | /* Returns true on success. */ |
171 | LTTNG_HIDDEN | |
172 | bool lttng_trace_chunk_get(struct lttng_trace_chunk *chunk); | |
173 | ||
174 | LTTNG_HIDDEN | |
175 | void lttng_trace_chunk_put(struct lttng_trace_chunk *chunk); | |
176 | ||
177 | #endif /* LTTNG_TRACE_CHUNK_H */ |