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[lttng-tools.git] / src / common / trace-chunk.h
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2c5ff4e4 1/*
ab5be9fa 2 * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
2c5ff4e4 3 *
ab5be9fa 4 * SPDX-License-Identifier: LGPL-2.1-only
2c5ff4e4 5 *
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6 */
7
8#ifndef LTTNG_TRACE_CHUNK_H
9#define LTTNG_TRACE_CHUNK_H
10
2c5ff4e4 11#include <common/compat/directory-handle.h>
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12#include <common/credentials.h>
13#include <common/fd-tracker/fd-tracker.h>
14#include <common/macros.h>
15#include <stdbool.h>
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16#include <stddef.h>
17#include <stdint.h>
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18
19/*
20 * A trace chunk is a group of directories and files forming a (or a set of)
21 * complete and independant trace(s). For instance, a trace archive chunk,
22 * a snapshot, or a regular LTTng trace are all instances of a trace archive.
23 *
24 * A trace chunk is always contained within a session output directory.
25 *
26 * This facility is used by the session daemon, consumer daemon(s), and relay
27 * daemon to:
28 * - Control file (data stream, metadata, and index) creation relative to
29 * a given output directory,
30 * - Track the use of an output directory by other objects in order to
31 * know if/when an output directory can be safely consumed, renamed,
32 * deleted, etc.
33 *
34 *
35 * OWNER VS USER
36 * ---
37 *
38 * A trace chunk can either be a owner or a user of its
39 * "chunk output directory".
40 *
41 * A "user" trace chunk is provided with a handle to the chunk output directory
42 * which can then be used to create subdirectories and files.
43 *
44 * An "owner" chunk, on top of being able to perform the operations of a "user"
45 * chunk can perform operations on its chunk output directory, such as renaming
46 * or deleting it.
47 *
48 * A trace chunk becomes an "owner" or "user" chunk based on which of
49 * 'lttng_trace_chunk_set_as_owner()' or 'lttng_trace_chunk_set_as_user()' is
50 * used. These methods are _exclusive_ and must only be used once on a
51 * trace chunk.
52 */
53
54struct lttng_trace_chunk;
b2621f79 55struct fd_tracker;
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56
57enum lttng_trace_chunk_status {
420acd90 58 LTTNG_TRACE_CHUNK_STATUS_OK,
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59 LTTNG_TRACE_CHUNK_STATUS_NONE,
60 LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT,
61 LTTNG_TRACE_CHUNK_STATUS_INVALID_OPERATION,
62 LTTNG_TRACE_CHUNK_STATUS_ERROR,
3ff5c5db 63 LTTNG_TRACE_CHUNK_STATUS_NO_FILE,
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64};
65
66enum lttng_trace_chunk_command_type {
67 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED = 0,
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68 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION = 1,
69 LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE = 2,
70 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MAX,
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71};
72
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73struct lttng_trace_chunk *lttng_trace_chunk_create_anonymous(void);
74
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75struct lttng_trace_chunk *lttng_trace_chunk_create(
76 uint64_t chunk_id,
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77 time_t chunk_creation_time,
78 const char *path);
2c5ff4e4 79
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80void lttng_trace_chunk_set_fd_tracker(struct lttng_trace_chunk *chunk,
81 struct fd_tracker *fd_tracker);
82
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83/*
84 * Copy a trace chunk. The copy that is returned is always a _user_
85 * mode chunk even if the source chunk was an _owner_ as there can never be
86 * two _owners_ of the same trace output.
87 */
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88struct lttng_trace_chunk *lttng_trace_chunk_copy(
89 struct lttng_trace_chunk *source_chunk);
90
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91enum lttng_trace_chunk_status lttng_trace_chunk_get_id(
92 struct lttng_trace_chunk *chunk, uint64_t *id);
93
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94enum lttng_trace_chunk_status lttng_trace_chunk_get_creation_timestamp(
95 struct lttng_trace_chunk *chunk, time_t *creation_ts);
96
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97enum lttng_trace_chunk_status lttng_trace_chunk_get_close_timestamp(
98 struct lttng_trace_chunk *chunk, time_t *close_ts);
99
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100enum lttng_trace_chunk_status lttng_trace_chunk_set_close_timestamp(
101 struct lttng_trace_chunk *chunk, time_t close_ts);
102
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103enum lttng_trace_chunk_status lttng_trace_chunk_get_name(
104 struct lttng_trace_chunk *chunk, const char **name,
913a542b 105 bool *name_overridden);
2c5ff4e4 106
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107bool lttng_trace_chunk_get_name_overridden(struct lttng_trace_chunk *chunk);
108
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109enum lttng_trace_chunk_status lttng_trace_chunk_override_name(
110 struct lttng_trace_chunk *chunk, const char *name);
111
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112enum lttng_trace_chunk_status lttng_trace_chunk_rename_path(
113 struct lttng_trace_chunk *chunk, const char *path);
114
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115enum lttng_trace_chunk_status lttng_trace_chunk_get_credentials(
116 struct lttng_trace_chunk *chunk,
117 struct lttng_credentials *credentials);
118
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119enum lttng_trace_chunk_status lttng_trace_chunk_set_credentials(
120 struct lttng_trace_chunk *chunk,
121 const struct lttng_credentials *credentials);
122
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123enum lttng_trace_chunk_status lttng_trace_chunk_set_credentials_current_user(
124 struct lttng_trace_chunk *chunk);
125
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126enum lttng_trace_chunk_status lttng_trace_chunk_set_as_owner(
127 struct lttng_trace_chunk *chunk,
128 struct lttng_directory_handle *session_output_directory);
129
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130enum lttng_trace_chunk_status lttng_trace_chunk_set_as_user(
131 struct lttng_trace_chunk *chunk,
132 struct lttng_directory_handle *chunk_directory);
133
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134enum lttng_trace_chunk_status
135lttng_trace_chunk_get_session_output_directory_handle(
136 struct lttng_trace_chunk *chunk,
137 struct lttng_directory_handle **handle);
138
cbf53d23 139enum lttng_trace_chunk_status lttng_trace_chunk_borrow_chunk_directory_handle(
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140 struct lttng_trace_chunk *chunk,
141 const struct lttng_directory_handle **handle);
142
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143enum lttng_trace_chunk_status lttng_trace_chunk_create_subdirectory(
144 struct lttng_trace_chunk *chunk,
145 const char *subdirectory_path);
146
2c5ff4e4 147enum lttng_trace_chunk_status lttng_trace_chunk_open_file(
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148 struct lttng_trace_chunk *chunk,
149 const char *filename,
150 int flags,
151 mode_t mode,
152 int *out_fd,
153 bool expect_no_file);
154
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155enum lttng_trace_chunk_status lttng_trace_chunk_open_fs_handle(
156 struct lttng_trace_chunk *chunk,
157 const char *filename,
158 int flags,
159 mode_t mode,
160 struct fs_handle **out_handle,
161 bool expect_no_file);
2c5ff4e4 162
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163int lttng_trace_chunk_unlink_file(struct lttng_trace_chunk *chunk,
164 const char *filename);
165
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166enum lttng_trace_chunk_status lttng_trace_chunk_get_close_command(
167 struct lttng_trace_chunk *chunk,
168 enum lttng_trace_chunk_command_type *command_type);
169
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170enum lttng_trace_chunk_status lttng_trace_chunk_set_close_command(
171 struct lttng_trace_chunk *chunk,
172 enum lttng_trace_chunk_command_type command_type);
173
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174const char *lttng_trace_chunk_command_type_get_name(
175 enum lttng_trace_chunk_command_type command);
176
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177bool lttng_trace_chunk_ids_equal(const struct lttng_trace_chunk *chunk_a,
178 const struct lttng_trace_chunk *chunk_b);
179
2c5ff4e4 180/* Returns true on success. */
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181bool lttng_trace_chunk_get(struct lttng_trace_chunk *chunk);
182
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183void lttng_trace_chunk_put(struct lttng_trace_chunk *chunk);
184
185#endif /* LTTNG_TRACE_CHUNK_H */
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