2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2016 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License, version 2 only, as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <sys/types.h>
26 #include <lttng/constant.h>
27 #include <common/common.h>
28 #include <common/defaults.h>
29 #include <common/compat/endian.h>
30 #include <common/utils.h>
34 #define WRITE_FILE_FLAGS O_WRONLY | O_CREAT | O_TRUNC
35 #define READ_ONLY_FILE_FLAGS O_RDONLY
37 static struct lttng_index_file
*_lttng_index_file_create_from_trace_chunk(
38 struct lttng_trace_chunk
*chunk
,
39 const char *channel_path
, const char *stream_name
,
40 uint64_t stream_file_size
, uint64_t stream_file_index
,
41 uint32_t index_major
, uint32_t index_minor
,
42 bool unlink_existing_file
,
45 struct lttng_index_file
*index_file
;
46 enum lttng_trace_chunk_status chunk_status
;
49 struct ctf_packet_index_file_hdr hdr
;
50 char index_directory_path
[LTTNG_PATH_MAX
];
51 char index_file_path
[LTTNG_PATH_MAX
];
52 const uint32_t element_len
= ctf_packet_index_len(index_major
,
54 const mode_t mode
= S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
;
55 const bool acquired_reference
= lttng_trace_chunk_get(chunk
);
57 assert(acquired_reference
);
59 index_file
= zmalloc(sizeof(*index_file
));
61 PERROR("Failed to allocate lttng_index_file");
65 index_file
->trace_chunk
= chunk
;
66 ret
= snprintf(index_directory_path
, sizeof(index_directory_path
),
67 "%s/" DEFAULT_INDEX_DIR
, channel_path
);
68 if (ret
< 0 || ret
>= sizeof(index_directory_path
)) {
69 ERR("Failed to format index directory path");
73 ret
= utils_stream_file_path(index_directory_path
, stream_name
,
74 stream_file_size
, stream_file_index
,
75 DEFAULT_INDEX_FILE_SUFFIX
,
76 index_file_path
, sizeof(index_file_path
));
81 if (unlink_existing_file
) {
83 * For tracefile rotation. We need to unlink the old
84 * file if present to synchronize with the tail of the
85 * live viewer which could be working on this same file.
86 * By doing so, any reference to the old index file
87 * stays valid even if we re-create a new file with the
88 * same name afterwards.
90 chunk_status
= lttng_trace_chunk_unlink_file(
91 chunk
, index_file_path
);
92 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
&&
93 !(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_ERROR
&&
99 chunk_status
= lttng_trace_chunk_open_file(chunk
, index_file_path
,
101 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
105 ctf_packet_index_file_hdr_init(&hdr
, index_major
, index_minor
);
106 size_ret
= lttng_write(fd
, &hdr
, sizeof(hdr
));
107 if (size_ret
< sizeof(hdr
)) {
108 PERROR("Failed to write index header");
112 index_file
->major
= index_major
;
113 index_file
->minor
= index_minor
;
114 index_file
->element_len
= element_len
;
115 urcu_ref_init(&index_file
->ref
);
123 PERROR("Failed to close file descriptor of index file");
130 struct lttng_index_file
*lttng_index_file_create_from_trace_chunk(
131 struct lttng_trace_chunk
*chunk
,
132 const char *channel_path
, const char *stream_name
,
133 uint64_t stream_file_size
, uint64_t stream_file_index
,
134 uint32_t index_major
, uint32_t index_minor
,
135 bool unlink_existing_file
)
137 return _lttng_index_file_create_from_trace_chunk(chunk
, channel_path
,
138 stream_name
, stream_file_size
, stream_file_index
,
139 index_major
, index_minor
, unlink_existing_file
,
143 struct lttng_index_file
*lttng_index_file_create_from_trace_chunk_read_only(
144 struct lttng_trace_chunk
*chunk
,
145 const char *channel_path
, const char *stream_name
,
146 uint64_t stream_file_size
, uint64_t stream_file_index
,
147 uint32_t index_major
, uint32_t index_minor
)
149 return _lttng_index_file_create_from_trace_chunk(chunk
, channel_path
,
150 stream_name
, stream_file_size
, stream_file_index
,
151 index_major
, index_minor
, false,
152 READ_ONLY_FILE_FLAGS
);
156 * Write index values to the given index file.
158 * Return 0 on success, -1 on error.
160 int lttng_index_file_write(const struct lttng_index_file
*index_file
,
161 const struct ctf_packet_index
*element
)
171 len
= index_file
->element_len
;
177 ret
= lttng_write(fd
, element
, len
);
179 PERROR("writing index file");
189 * Read index values from the given index file.
191 * Return 0 on success, -1 on error.
193 int lttng_index_file_read(const struct lttng_index_file
*index_file
,
194 struct ctf_packet_index
*element
)
197 int fd
= index_file
->fd
;
198 size_t len
= index_file
->element_len
;
206 ret
= lttng_read(fd
, element
, len
);
208 PERROR("read index file");
212 ERR("lttng_read expected %zu, returned %zd", len
, ret
);
221 void lttng_index_file_get(struct lttng_index_file
*index_file
)
223 urcu_ref_get(&index_file
->ref
);
226 static void lttng_index_file_release(struct urcu_ref
*ref
)
228 struct lttng_index_file
*index_file
= caa_container_of(ref
,
229 struct lttng_index_file
, ref
);
231 if (close(index_file
->fd
)) {
232 PERROR("close index fd");
234 lttng_trace_chunk_put(index_file
->trace_chunk
);
238 void lttng_index_file_put(struct lttng_index_file
*index_file
)
240 urcu_ref_put(&index_file
->ref
, lttng_index_file_release
);