src/plugins/ctf/fs-src/data-stream-file.c

   1 /*
   2  * Copyright 2016-2017 - Philippe Proulx <pproulx@efficios.com>
   3  * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  * Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #define BT_COMP_LOG_SELF_COMP (self_comp)
  26 #define BT_LOG_OUTPUT_LEVEL (log_level)
  27 #define BT_LOG_TAG "PLUGIN/SRC.CTF.FS/DS"
  28 #include "logging/comp-logging.h"
  29
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <stdint.h>
  33 #include <stdlib.h>
  34 #include <glib.h>
  35 #include <inttypes.h>
  36 #include "compat/mman.h"
  37 #include "compat/endian.h"
  38 #include <babeltrace2/babeltrace.h>
  39 #include "common/common.h"
  40 #include "file.h"
  41 #include "metadata.h"
  42 #include "../common/msg-iter/msg-iter.h"
  43 #include "common/assert.h"
  44 #include "data-stream-file.h"
  45 #include <string.h>
  46
  47 static inline
  48 size_t remaining_mmap_bytes(struct ctf_fs_ds_file *ds_file)
  49 {
  50         BT_ASSERT_DBG(ds_file->mmap_len >= ds_file->request_offset);
  51         return ds_file->mmap_len - ds_file->request_offset;
  52 }
  53
  54 static
  55 int ds_file_munmap(struct ctf_fs_ds_file *ds_file)
  56 {
  57         int ret = 0;
  58         bt_self_component *self_comp = ds_file->self_comp;
  59         bt_logging_level log_level = ds_file->log_level;
  60
  61         if (!ds_file || !ds_file->mmap_addr) {
  62                 goto end;
  63         }
  64
  65         if (bt_munmap(ds_file->mmap_addr, ds_file->mmap_len)) {
  66                 BT_COMP_LOGE_ERRNO("Cannot memory-unmap file",
  67                         ": address=%p, size=%zu, file_path=\"%s\", file=%p",
  68                         ds_file->mmap_addr, ds_file->mmap_len,
  69                         ds_file->file ? ds_file->file->path->str : "NULL",
  70                         ds_file->file ? ds_file->file->fp : NULL);
  71                 ret = -1;
  72                 goto end;
  73         }
  74
  75         ds_file->mmap_addr = NULL;
  76
  77 end:
  78         return ret;
  79 }
  80
  81 static
  82 enum ctf_msg_iter_medium_status ds_file_mmap_next(
  83                 struct ctf_fs_ds_file *ds_file)
  84 {
  85         enum ctf_msg_iter_medium_status ret =
  86                         CTF_MSG_ITER_MEDIUM_STATUS_OK;
  87         bt_self_component *self_comp = ds_file->self_comp;
  88         bt_logging_level log_level = ds_file->log_level;
  89
  90         /* Unmap old region */
  91         if (ds_file->mmap_addr) {
  92                 if (ds_file_munmap(ds_file)) {
  93                         goto error;
  94                 }
  95
  96                 /*
  97                  * mmap_len is guaranteed to be page-aligned except on the
  98                  * last mapping where it may not be possible (since the file's
  99                  * size itself may not be a page multiple).
 100                  */
 101                 ds_file->mmap_offset += ds_file->mmap_len;
 102                 ds_file->request_offset = 0;
 103         }
 104
 105         ds_file->mmap_len = MIN(ds_file->file->size - ds_file->mmap_offset,
 106                         ds_file->mmap_max_len);
 107         if (ds_file->mmap_len == 0) {
 108                 ret = CTF_MSG_ITER_MEDIUM_STATUS_EOF;
 109                 goto end;
 110         }
 111         /* Map new region */
 112         BT_ASSERT(ds_file->mmap_len);
 113         ds_file->mmap_addr = bt_mmap((void *) 0, ds_file->mmap_len,
 114                         PROT_READ, MAP_PRIVATE, fileno(ds_file->file->fp),
 115                         ds_file->mmap_offset, ds_file->log_level);
 116         if (ds_file->mmap_addr == MAP_FAILED) {
 117                 BT_COMP_LOGE("Cannot memory-map address (size %zu) of file \"%s\" (%p) at offset %jd: %s",
 118                                 ds_file->mmap_len, ds_file->file->path->str,
 119                                 ds_file->file->fp, (intmax_t) ds_file->mmap_offset,
 120                                 strerror(errno));
 121                 goto error;
 122         }
 123
 124         goto end;
 125 error:
 126         ds_file_munmap(ds_file);
 127         ret = CTF_MSG_ITER_MEDIUM_STATUS_ERROR;
 128 end:
 129         return ret;
 130 }
 131
 132 static
 133 enum ctf_msg_iter_medium_status medop_request_bytes(
 134                 size_t request_sz, uint8_t **buffer_addr,
 135                 size_t *buffer_sz, void *data)
 136 {
 137         enum ctf_msg_iter_medium_status status =
 138                 CTF_MSG_ITER_MEDIUM_STATUS_OK;
 139         struct ctf_fs_ds_file *ds_file = data;
 140         bt_self_component *self_comp = ds_file->self_comp;
 141         bt_logging_level log_level = ds_file->log_level;
 142
 143         if (request_sz == 0) {
 144                 goto end;
 145         }
 146
 147         /*
 148          * Check if we have at least one memory-mapped byte left. If we don't,
 149          * mmap the next file.
 150          */
 151         if (remaining_mmap_bytes(ds_file) == 0) {
 152                 /* Are we at the end of the file? */
 153                 if (ds_file->mmap_offset >= ds_file->file->size) {
 154                         BT_COMP_LOGD("Reached end of file \"%s\" (%p)",
 155                                 ds_file->file->path->str, ds_file->file->fp);
 156                         status = CTF_MSG_ITER_MEDIUM_STATUS_EOF;
 157                         goto end;
 158                 }
 159
 160                 status = ds_file_mmap_next(ds_file);
 161                 switch (status) {
 162                 case CTF_MSG_ITER_MEDIUM_STATUS_OK:
 163                         break;
 164                 case CTF_MSG_ITER_MEDIUM_STATUS_EOF:
 165                         goto end;
 166                 default:
 167                         BT_COMP_LOGE("Cannot memory-map next region of file \"%s\" (%p)",
 168                                         ds_file->file->path->str,
 169                                         ds_file->file->fp);
 170                         goto error;
 171                 }
 172         }
 173
 174         *buffer_sz = MIN(remaining_mmap_bytes(ds_file), request_sz);
 175         BT_ASSERT(ds_file->mmap_addr);
 176         *buffer_addr = ((uint8_t *) ds_file->mmap_addr) + ds_file->request_offset;
 177         ds_file->request_offset += *buffer_sz;
 178         goto end;
 179
 180 error:
 181         status = CTF_MSG_ITER_MEDIUM_STATUS_ERROR;
 182
 183 end:
 184         return status;
 185 }
 186
 187 static
 188 bt_stream *medop_borrow_stream(bt_stream_class *stream_class, int64_t stream_id,
 189                 void *data)
 190 {
 191         struct ctf_fs_ds_file *ds_file = data;
 192         bt_stream_class *ds_file_stream_class;
 193         bt_stream *stream = NULL;
 194
 195         ds_file_stream_class = bt_stream_borrow_class(
 196                 ds_file->stream);
 197
 198         if (stream_class != ds_file_stream_class) {
 199                 /*
 200                  * Not supported: two packets described by two different
 201                  * stream classes within the same data stream file.
 202                  */
 203                 goto end;
 204         }
 205
 206         stream = ds_file->stream;
 207
 208 end:
 209         return stream;
 210 }
 211
 212 static
 213 enum ctf_msg_iter_medium_status medop_seek(enum ctf_msg_iter_seek_whence whence,
 214                 off_t offset, void *data)
 215 {
 216         enum ctf_msg_iter_medium_status ret =
 217                         CTF_MSG_ITER_MEDIUM_STATUS_OK;
 218         struct ctf_fs_ds_file *ds_file = data;
 219         off_t offset_in_mapping, file_size = ds_file->file->size;
 220         bt_self_component *self_comp = ds_file->self_comp;
 221         bt_logging_level log_level = ds_file->log_level;
 222
 223         if (whence != CTF_MSG_ITER_SEEK_WHENCE_SET ||
 224                 offset < 0 || offset > file_size) {
 225                 BT_COMP_LOGE("Invalid medium seek request: whence=%d, offset=%jd, "
 226                                 "file-size=%jd", (int) whence, (intmax_t) offset,
 227                                 (intmax_t) file_size);
 228                 ret = CTF_MSG_ITER_MEDIUM_STATUS_INVAL;
 229                 goto end;
 230         }
 231
 232         /* If there is no current mapping, map the right file directly. */
 233         if (!ds_file->mmap_addr) {
 234                 goto map_requested_offset;
 235         }
 236
 237         /*
 238          * Determine whether or not the destination is contained within the
 239          * current mapping.
 240          */
 241         if (offset < ds_file->mmap_offset ||
 242                         offset >= ds_file->mmap_offset + ds_file->mmap_len) {
 243                 int unmap_ret;
 244                 BT_COMP_LOGD("Medium seek request cannot be accomodated by the current "
 245                                 "file mapping: offset=%jd, mmap-offset=%jd, "
 246                                 "mmap-len=%zu", (intmax_t) offset, (intmax_t) ds_file->mmap_offset,
 247                                 ds_file->mmap_len);
 248                 unmap_ret = ds_file_munmap(ds_file);
 249                 if (unmap_ret) {
 250                         ret = CTF_MSG_ITER_MEDIUM_STATUS_ERROR;
 251                         goto end;
 252                 }
 253                 goto map_requested_offset;
 254         } else {
 255                 ds_file->request_offset = offset - ds_file->mmap_offset;
 256                 goto test_end;
 257         }
 258
 259 map_requested_offset:
 260         offset_in_mapping = offset %
 261                 bt_mmap_get_offset_align_size(ds_file->log_level);
 262
 263         ds_file->mmap_offset = offset - offset_in_mapping;
 264         ds_file->request_offset = offset_in_mapping;
 265         ret = ds_file_mmap_next(ds_file);
 266         if (ret != CTF_MSG_ITER_MEDIUM_STATUS_OK) {
 267                 goto end;
 268         }
 269
 270 test_end:
 271         ds_file->end_reached = (offset == file_size);
 272 end:
 273         return ret;
 274 }
 275
 276 BT_HIDDEN
 277 struct ctf_msg_iter_medium_ops ctf_fs_ds_file_medops = {
 278         .request_bytes = medop_request_bytes,
 279         .borrow_stream = medop_borrow_stream,
 280         .seek = medop_seek,
 281 };
 282
 283 static
 284 int convert_cycles_to_ns(struct ctf_clock_class *clock_class,
 285                 uint64_t cycles, int64_t *ns)
 286 {
 287         return bt_util_clock_cycles_to_ns_from_origin(cycles,
 288                         clock_class->frequency, clock_class->offset_seconds,
 289                         clock_class->offset_cycles, ns);
 290 }
 291
 292 static
 293 struct ctf_fs_ds_index *build_index_from_idx_file(
 294                 struct ctf_fs_ds_file *ds_file,
 295                 struct ctf_fs_ds_file_info *file_info)
 296 {
 297         int ret;
 298         gchar *directory = NULL;
 299         gchar *basename = NULL;
 300         GString *index_basename = NULL;
 301         gchar *index_file_path = NULL;
 302         GMappedFile *mapped_file = NULL;
 303         gsize filesize;
 304         const char *mmap_begin = NULL, *file_pos = NULL;
 305         const struct ctf_packet_index_file_hdr *header = NULL;
 306         struct ctf_fs_ds_index *index = NULL;
 307         struct ctf_fs_ds_index_entry *index_entry = NULL, *prev_index_entry = NULL;
 308         uint64_t total_packets_size = 0;
 309         size_t file_index_entry_size;
 310         size_t file_entry_count;
 311         size_t i;
 312         struct ctf_stream_class *sc;
 313         struct ctf_msg_iter_packet_properties props;
 314         uint32_t version_major, version_minor;
 315         bt_self_component *self_comp = ds_file->self_comp;
 316         bt_logging_level log_level = ds_file->log_level;
 317
 318         BT_COMP_LOGI("Building index from .idx file of stream file %s",
 319                         ds_file->file->path->str);
 320         ret = ctf_msg_iter_get_packet_properties(ds_file->msg_iter, &props);
 321         if (ret) {
 322                 BT_COMP_LOGI_STR("Cannot read first packet's header and context fields.");
 323                 goto error;
 324         }
 325
 326         sc = ctf_trace_class_borrow_stream_class_by_id(ds_file->metadata->tc,
 327                 props.stream_class_id);
 328         BT_ASSERT(sc);
 329         if (!sc->default_clock_class) {
 330                 BT_COMP_LOGI_STR("Cannot find stream class's default clock class.");
 331                 goto error;
 332         }
 333
 334         /* Look for index file in relative path index/name.idx. */
 335         basename = g_path_get_basename(ds_file->file->path->str);
 336         if (!basename) {
 337                 BT_COMP_LOGE("Cannot get the basename of datastream file %s",
 338                                 ds_file->file->path->str);
 339                 goto error;
 340         }
 341
 342         directory = g_path_get_dirname(ds_file->file->path->str);
 343         if (!directory) {
 344                 BT_COMP_LOGE("Cannot get dirname of datastream file %s",
 345                                 ds_file->file->path->str);
 346                 goto error;
 347         }
 348
 349         index_basename = g_string_new(basename);
 350         if (!index_basename) {
 351                 BT_COMP_LOGE_STR("Cannot allocate index file basename string");
 352                 goto error;
 353         }
 354
 355         g_string_append(index_basename, ".idx");
 356         index_file_path = g_build_filename(directory, "index",
 357                         index_basename->str, NULL);
 358         mapped_file = g_mapped_file_new(index_file_path, FALSE, NULL);
 359         if (!mapped_file) {
 360                 BT_COMP_LOGD("Cannot create new mapped file %s",
 361                                 index_file_path);
 362                 goto error;
 363         }
 364
 365         /*
 366          * The g_mapped_file API limits us to 4GB files on 32-bit.
 367          * Traces with such large indexes have never been seen in the wild,
 368          * but this would need to be adjusted to support them.
 369          */
 370         filesize = g_mapped_file_get_length(mapped_file);
 371         if (filesize < sizeof(*header)) {
 372                 BT_COMP_LOGW("Invalid LTTng trace index file: "
 373                         "file size (%zu bytes) < header size (%zu bytes)",
 374                         filesize, sizeof(*header));
 375                 goto error;
 376         }
 377
 378         mmap_begin = g_mapped_file_get_contents(mapped_file);
 379         header = (struct ctf_packet_index_file_hdr *) mmap_begin;
 380
 381         file_pos = g_mapped_file_get_contents(mapped_file) + sizeof(*header);
 382         if (be32toh(header->magic) != CTF_INDEX_MAGIC) {
 383                 BT_COMP_LOGW_STR("Invalid LTTng trace index: \"magic\" field validation failed");
 384                 goto error;
 385         }
 386
 387         version_major = be32toh(header->index_major);
 388         version_minor = be32toh(header->index_minor);
 389         if (version_major != 1) {
 390                 BT_COMP_LOGW(
 391                         "Unknown LTTng trace index version: "
 392                         "major=%" PRIu32 ", minor=%" PRIu32,
 393                         version_major, version_minor);
 394                 goto error;
 395         }
 396
 397         file_index_entry_size = be32toh(header->packet_index_len);
 398         file_entry_count = (filesize - sizeof(*header)) / file_index_entry_size;
 399         if ((filesize - sizeof(*header)) % file_index_entry_size) {
 400                 BT_COMP_LOGW("Invalid LTTng trace index: the index's size after the header "
 401                         "(%zu bytes) is not a multiple of the index entry size "
 402                         "(%zu bytes)", (filesize - sizeof(*header)),
 403                         sizeof(*header));
 404                 goto error;
 405         }
 406
 407         index = ctf_fs_ds_index_create(ds_file->log_level, ds_file->self_comp);
 408         if (!index) {
 409                 goto error;
 410         }
 411
 412         for (i = 0; i < file_entry_count; i++) {
 413                 struct ctf_packet_index *file_index =
 414                                 (struct ctf_packet_index *) file_pos;
 415                 uint64_t packet_size = be64toh(file_index->packet_size);
 416
 417                 if (packet_size % CHAR_BIT) {
 418                         BT_COMP_LOGW("Invalid packet size encountered in LTTng trace index file");
 419                         goto error;
 420                 }
 421
 422                 index_entry = g_new0(struct ctf_fs_ds_index_entry, 1);
 423                 if (!index_entry) {
 424                         goto error;
 425                 }
 426
 427                 /* Set path to stream file. */
 428                 index_entry->path = file_info->path->str;
 429
 430                 /* Convert size in bits to bytes. */
 431                 packet_size /= CHAR_BIT;
 432                 index_entry->packet_size = packet_size;
 433
 434                 index_entry->offset = be64toh(file_index->offset);
 435                 if (i != 0 && index_entry->offset < prev_index_entry->offset) {
 436                         BT_COMP_LOGW("Invalid, non-monotonic, packet offset encountered in LTTng trace index file: "
 437                                 "previous offset=%" PRIu64 ", current offset=%" PRIu64,
 438                                 prev_index_entry->offset, index_entry->offset);
 439                         goto error;
 440                 }
 441
 442                 index_entry->timestamp_begin = be64toh(file_index->timestamp_begin);
 443                 index_entry->timestamp_end = be64toh(file_index->timestamp_end);
 444                 if (index_entry->timestamp_end < index_entry->timestamp_begin) {
 445                         BT_COMP_LOGW("Invalid packet time bounds encountered in LTTng trace index file (begin > end): "
 446                                 "timestamp_begin=%" PRIu64 "timestamp_end=%" PRIu64,
 447                                 index_entry->timestamp_begin,
 448                                 index_entry->timestamp_end);
 449                         goto error;
 450                 }
 451
 452                 /* Convert the packet's bound to nanoseconds since Epoch. */
 453                 ret = convert_cycles_to_ns(sc->default_clock_class,
 454                                 index_entry->timestamp_begin,
 455                                 &index_entry->timestamp_begin_ns);
 456                 if (ret) {
 457                         BT_COMP_LOGI_STR("Failed to convert raw timestamp to nanoseconds since Epoch during index parsing");
 458                         goto error;
 459                 }
 460                 ret = convert_cycles_to_ns(sc->default_clock_class,
 461                                 index_entry->timestamp_end,
 462                                 &index_entry->timestamp_end_ns);
 463                 if (ret) {
 464                         BT_COMP_LOGI_STR("Failed to convert raw timestamp to nanoseconds since Epoch during LTTng trace index parsing");
 465                         goto error;
 466                 }
 467
 468                 total_packets_size += packet_size;
 469                 file_pos += file_index_entry_size;
 470
 471                 prev_index_entry = index_entry;
 472
 473                 /* Give ownership of `index_entry` to `index->entries`. */
 474                 g_ptr_array_add(index->entries, index_entry);
 475                 index_entry = NULL;
 476         }
 477
 478         /* Validate that the index addresses the complete stream. */
 479         if (ds_file->file->size != total_packets_size) {
 480                 BT_COMP_LOGW("Invalid LTTng trace index file; indexed size != stream file size: "
 481                         "file-size=%" PRIu64 ", total-packets-size=%" PRIu64,
 482                         ds_file->file->size, total_packets_size);
 483                 goto error;
 484         }
 485 end:
 486         g_free(directory);
 487         g_free(basename);
 488         g_free(index_file_path);
 489         if (index_basename) {
 490                 g_string_free(index_basename, TRUE);
 491         }
 492         if (mapped_file) {
 493                 g_mapped_file_unref(mapped_file);
 494         }
 495         return index;
 496 error:
 497         ctf_fs_ds_index_destroy(index);
 498         g_free(index_entry);
 499         index = NULL;
 500         goto end;
 501 }
 502
 503 static
 504 int init_index_entry(struct ctf_fs_ds_index_entry *entry,
 505                 struct ctf_fs_ds_file *ds_file,
 506                 struct ctf_msg_iter_packet_properties *props,
 507                 off_t packet_size, off_t packet_offset)
 508 {
 509         int ret = 0;
 510         struct ctf_stream_class *sc;
 511         bt_self_component *self_comp = ds_file->self_comp;
 512         bt_logging_level log_level = ds_file->log_level;
 513
 514         sc = ctf_trace_class_borrow_stream_class_by_id(ds_file->metadata->tc,
 515                 props->stream_class_id);
 516         BT_ASSERT(sc);
 517         BT_ASSERT(packet_offset >= 0);
 518         entry->offset = packet_offset;
 519         BT_ASSERT(packet_size >= 0);
 520         entry->packet_size = packet_size;
 521
 522         if (props->snapshots.beginning_clock != UINT64_C(-1)) {
 523                 entry->timestamp_begin = props->snapshots.beginning_clock;
 524
 525                 /* Convert the packet's bound to nanoseconds since Epoch. */
 526                 ret = convert_cycles_to_ns(sc->default_clock_class,
 527                                            props->snapshots.beginning_clock,
 528                                            &entry->timestamp_begin_ns);
 529                 if (ret) {
 530                         BT_COMP_LOGI_STR("Failed to convert raw timestamp to nanoseconds since Epoch.");
 531                         goto end;
 532                 }
 533         } else {
 534                 entry->timestamp_begin = UINT64_C(-1);
 535                 entry->timestamp_begin_ns = UINT64_C(-1);
 536         }
 537
 538         if (props->snapshots.end_clock != UINT64_C(-1)) {
 539                 entry->timestamp_end = props->snapshots.end_clock;
 540
 541                 /* Convert the packet's bound to nanoseconds since Epoch. */
 542                 ret = convert_cycles_to_ns(sc->default_clock_class,
 543                                            props->snapshots.end_clock,
 544                                            &entry->timestamp_end_ns);
 545                 if (ret) {
 546                         BT_COMP_LOGI_STR("Failed to convert raw timestamp to nanoseconds since Epoch.");
 547                         goto end;
 548                 }
 549         } else {
 550                 entry->timestamp_end = UINT64_C(-1);
 551                 entry->timestamp_end_ns = UINT64_C(-1);
 552         }
 553
 554 end:
 555         return ret;
 556 }
 557
 558 static
 559 struct ctf_fs_ds_index *build_index_from_stream_file(
 560                 struct ctf_fs_ds_file *ds_file,
 561                 struct ctf_fs_ds_file_info *file_info)
 562 {
 563         int ret;
 564         struct ctf_fs_ds_index *index = NULL;
 565         enum ctf_msg_iter_status iter_status = CTF_MSG_ITER_STATUS_OK;
 566         off_t current_packet_offset_bytes = 0;
 567         bt_self_component *self_comp = ds_file->self_comp;
 568         bt_logging_level log_level = ds_file->log_level;
 569
 570         BT_COMP_LOGI("Indexing stream file %s", ds_file->file->path->str);
 571
 572         index = ctf_fs_ds_index_create(ds_file->log_level, ds_file->self_comp);
 573         if (!index) {
 574                 goto error;
 575         }
 576
 577         while (true) {
 578                 off_t current_packet_size_bytes;
 579                 struct ctf_fs_ds_index_entry *index_entry;
 580                 struct ctf_msg_iter_packet_properties props;
 581
 582                 if (current_packet_offset_bytes < 0) {
 583                         BT_COMP_LOGE_STR("Cannot get the current packet's offset.");
 584                         goto error;
 585                 } else if (current_packet_offset_bytes > ds_file->file->size) {
 586                         BT_COMP_LOGE_STR("Unexpected current packet's offset (larger than file).");
 587                         goto error;
 588                 } else if (current_packet_offset_bytes == ds_file->file->size) {
 589                         /* No more data */
 590                         break;
 591                 }
 592
 593                 iter_status = ctf_msg_iter_seek(ds_file->msg_iter,
 594                                 current_packet_offset_bytes);
 595                 if (iter_status != CTF_MSG_ITER_STATUS_OK) {
 596                         goto error;
 597                 }
 598
 599                 iter_status = ctf_msg_iter_get_packet_properties(
 600                         ds_file->msg_iter, &props);
 601                 if (iter_status != CTF_MSG_ITER_STATUS_OK) {
 602                         goto error;
 603                 }
 604
 605                 if (props.exp_packet_total_size >= 0) {
 606                         current_packet_size_bytes =
 607                                 (uint64_t) props.exp_packet_total_size / 8;
 608                 } else {
 609                         current_packet_size_bytes = ds_file->file->size;
 610                 }
 611
 612                 if (current_packet_offset_bytes + current_packet_size_bytes >
 613                                 ds_file->file->size) {
 614                         BT_COMP_LOGW("Invalid packet size reported in file: stream=\"%s\", "
 615                                         "packet-offset=%jd, packet-size-bytes=%jd, "
 616                                         "file-size=%jd",
 617                                         ds_file->file->path->str,
 618                                         (intmax_t) current_packet_offset_bytes,
 619                                         (intmax_t) current_packet_size_bytes,
 620                                         (intmax_t) ds_file->file->size);
 621                         goto error;
 622                 }
 623
 624                 index_entry = g_new0(struct ctf_fs_ds_index_entry, 1);
 625                 if (!index_entry) {
 626                         BT_COMP_LOGE_STR("Failed to allocate a new index entry.");
 627                         goto error;
 628                 }
 629
 630                 /* Set path to stream file. */
 631                 index_entry->path = file_info->path->str;
 632
 633                 ret = init_index_entry(index_entry, ds_file, &props,
 634                         current_packet_size_bytes, current_packet_offset_bytes);
 635                 if (ret) {
 636                         g_free(index_entry);
 637                         goto error;
 638                 }
 639
 640                 g_ptr_array_add(index->entries, index_entry);
 641
 642                 current_packet_offset_bytes += current_packet_size_bytes;
 643                 BT_COMP_LOGD("Seeking to next packet: current-packet-offset=%jd, "
 644                         "next-packet-offset=%jd",
 645                         (intmax_t) (current_packet_offset_bytes - current_packet_size_bytes),
 646                         (intmax_t) current_packet_offset_bytes);
 647         }
 648
 649 end:
 650         return index;
 651
 652 error:
 653         ctf_fs_ds_index_destroy(index);
 654         index = NULL;
 655         goto end;
 656 }
 657
 658 BT_HIDDEN
 659 struct ctf_fs_ds_file *ctf_fs_ds_file_create(
 660                 struct ctf_fs_trace *ctf_fs_trace,
 661                 bt_self_message_iterator *pc_msg_iter,
 662                 struct ctf_msg_iter *msg_iter,
 663                 bt_stream *stream, const char *path,
 664                 bt_logging_level log_level)
 665 {
 666         int ret;
 667         const size_t offset_align = bt_mmap_get_offset_align_size(log_level);
 668         struct ctf_fs_ds_file *ds_file = g_new0(struct ctf_fs_ds_file, 1);
 669
 670         if (!ds_file) {
 671                 goto error;
 672         }
 673
 674         ds_file->log_level = log_level;
 675         ds_file->self_comp = ctf_fs_trace->self_comp;
 676         ds_file->self_msg_iter = pc_msg_iter;
 677         ds_file->file = ctf_fs_file_create(log_level, ds_file->self_comp);
 678         if (!ds_file->file) {
 679                 goto error;
 680         }
 681
 682         ds_file->stream = stream;
 683         bt_stream_get_ref(ds_file->stream);
 684         ds_file->metadata = ctf_fs_trace->metadata;
 685         g_string_assign(ds_file->file->path, path);
 686         ret = ctf_fs_file_open(ds_file->file, "rb");
 687         if (ret) {
 688                 goto error;
 689         }
 690
 691         ds_file->msg_iter = msg_iter;
 692         ctf_msg_iter_set_medops_data(ds_file->msg_iter, ds_file);
 693         if (!ds_file->msg_iter) {
 694                 goto error;
 695         }
 696
 697         ds_file->mmap_max_len = offset_align * 2048;
 698
 699         goto end;
 700
 701 error:
 702         /* Do not touch "borrowed" file. */
 703         ctf_fs_ds_file_destroy(ds_file);
 704         ds_file = NULL;
 705
 706 end:
 707         return ds_file;
 708 }
 709
 710 BT_HIDDEN
 711 struct ctf_fs_ds_index *ctf_fs_ds_file_build_index(
 712                 struct ctf_fs_ds_file *ds_file,
 713                 struct ctf_fs_ds_file_info *file_info)
 714 {
 715         struct ctf_fs_ds_index *index;
 716         bt_self_component *self_comp = ds_file->self_comp;
 717         bt_logging_level log_level = ds_file->log_level;
 718
 719         index = build_index_from_idx_file(ds_file, file_info);
 720         if (index) {
 721                 goto end;
 722         }
 723
 724         BT_COMP_LOGI("Failed to build index from .index file; "
 725                 "falling back to stream indexing.");
 726         index = build_index_from_stream_file(ds_file, file_info);
 727 end:
 728         return index;
 729 }
 730
 731 BT_HIDDEN
 732 struct ctf_fs_ds_index *ctf_fs_ds_index_create(bt_logging_level log_level,
 733                 bt_self_component *self_comp)
 734 {
 735         struct ctf_fs_ds_index *index = g_new0(struct ctf_fs_ds_index, 1);
 736
 737         if (!index) {
 738                 BT_COMP_LOG_CUR_LVL(BT_LOG_ERROR, log_level, self_comp,
 739                         "Failed to allocate index");
 740                 goto error;
 741         }
 742
 743         index->entries = g_ptr_array_new_with_free_func((GDestroyNotify) g_free);
 744         if (!index->entries) {
 745                 BT_COMP_LOG_CUR_LVL(BT_LOG_ERROR, log_level, self_comp,
 746                         "Failed to allocate index entries.");
 747                 goto error;
 748         }
 749
 750         goto end;
 751
 752 error:
 753         ctf_fs_ds_index_destroy(index);
 754         index = NULL;
 755 end:
 756         return index;
 757 }
 758
 759 BT_HIDDEN
 760 void ctf_fs_ds_file_destroy(struct ctf_fs_ds_file *ds_file)
 761 {
 762         if (!ds_file) {
 763                 return;
 764         }
 765
 766         bt_stream_put_ref(ds_file->stream);
 767         (void) ds_file_munmap(ds_file);
 768
 769         if (ds_file->file) {
 770                 ctf_fs_file_destroy(ds_file->file);
 771         }
 772
 773         g_free(ds_file);
 774 }
 775
 776 BT_HIDDEN
 777 bt_component_class_message_iterator_next_method_status ctf_fs_ds_file_next(
 778                 struct ctf_fs_ds_file *ds_file,
 779                 bt_message **msg)
 780 {
 781         enum ctf_msg_iter_status msg_iter_status;
 782         bt_component_class_message_iterator_next_method_status status;
 783
 784         msg_iter_status = ctf_msg_iter_get_next_message(
 785                 ds_file->msg_iter, msg);
 786
 787         switch (msg_iter_status) {
 788         case CTF_MSG_ITER_STATUS_EOF:
 789                 status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END;
 790                 break;
 791         case CTF_MSG_ITER_STATUS_OK:
 792                 status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
 793                 break;
 794         case CTF_MSG_ITER_STATUS_AGAIN:
 795                 /*
 796                  * Should not make it this far as this is
 797                  * medium-specific; there is nothing for the user to do
 798                  * and it should have been handled upstream.
 799                  */
 800                 bt_common_abort();
 801         case CTF_MSG_ITER_STATUS_INVAL:
 802         case CTF_MSG_ITER_STATUS_ERROR:
 803         default:
 804                 status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
 805                 break;
 806         }
 807         return status;
 808 }
 809
 810 BT_HIDDEN
 811 void ctf_fs_ds_index_destroy(struct ctf_fs_ds_index *index)
 812 {
 813         if (!index) {
 814                 return;
 815         }
 816
 817         if (index->entries) {
 818                 g_ptr_array_free(index->entries, TRUE);
 819         }
 820         g_free(index);
 821 }