src/ctfser/ctfser.c

   1 /*
   2  * Copyright 2019 Philippe Proulx <pproulx@efficios.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #define BT_LOG_OUTPUT_LEVEL (ctfser->log_level)
  24 #define BT_LOG_TAG "CTFSER"
  25 #include "logging/log.h"
  26
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <inttypes.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <unistd.h>
  33 #include "common/assert.h"
  34 #include <stdarg.h>
  35 #include <ctype.h>
  36 #include <glib.h>
  37 #include <stdlib.h>
  38 #include <stdio.h>
  39 #include <wchar.h>
  40 #include "common/macros.h"
  41 #include "common/common.h"
  42 #include "ctfser/ctfser.h"
  43 #include "compat/unistd.h"
  44 #include "compat/fcntl.h"
  45
  46 static inline
  47 uint64_t get_packet_size_increment_bytes(struct bt_ctfser *ctfser)
  48 {
  49         return bt_common_get_page_size(ctfser->log_level) * 8;
  50 }
  51
  52 static inline
  53 void mmap_align_ctfser(struct bt_ctfser *ctfser)
  54 {
  55         ctfser->base_mma = mmap_align(ctfser->cur_packet_size_bytes,
  56                 PROT_READ | PROT_WRITE,
  57                 MAP_SHARED, ctfser->fd, ctfser->mmap_offset, ctfser->log_level);
  58 }
  59
  60 BT_HIDDEN
  61 int _bt_ctfser_increase_cur_packet_size(struct bt_ctfser *ctfser)
  62 {
  63         int ret;
  64
  65         BT_ASSERT(ctfser);
  66         BT_LOGD("Increasing stream file's current packet size: "
  67                 "path=\"%s\", fd=%d, "
  68                 "offset-in-cur-packet-bits=%" PRIu64 ", "
  69                 "cur-packet-size-bytes=%" PRIu64,
  70                 ctfser->path->str, ctfser->fd,
  71                 ctfser->offset_in_cur_packet_bits,
  72                 ctfser->cur_packet_size_bytes);
  73         ret = munmap_align(ctfser->base_mma);
  74         if (ret) {
  75                 BT_LOGE_ERRNO("Failed to perform an aligned memory unmapping",
  76                         ": ret=%d", ret);
  77                 goto end;
  78         }
  79
  80         ctfser->cur_packet_size_bytes += get_packet_size_increment_bytes(
  81                 ctfser);
  82
  83         do {
  84                 ret = bt_posix_fallocate(ctfser->fd, ctfser->mmap_offset,
  85                         ctfser->cur_packet_size_bytes);
  86         } while (ret == EINTR);
  87
  88         if (ret) {
  89                 BT_LOGE("Failed to preallocate memory space: ret=%d", ret);
  90                 goto end;
  91         }
  92
  93         mmap_align_ctfser(ctfser);
  94         if (ctfser->base_mma == MAP_FAILED) {
  95                 BT_LOGE_ERRNO("Failed to perform an aligned memory mapping",
  96                         ": ret=%d", ret);
  97                 ret = -1;
  98                 goto end;
  99         }
 100
 101         BT_LOGD("Increased packet size: "
 102                 "path=\"%s\", fd=%d, "
 103                 "offset-in-cur-packet-bits=%" PRIu64 ", "
 104                 "new-packet-size-bytes=%" PRIu64,
 105                 ctfser->path->str, ctfser->fd,
 106                 ctfser->offset_in_cur_packet_bits,
 107                 ctfser->cur_packet_size_bytes);
 108
 109 end:
 110         return ret;
 111 }
 112
 113 BT_HIDDEN
 114 int bt_ctfser_init(struct bt_ctfser *ctfser, const char *path, int log_level)
 115 {
 116         int ret = 0;
 117
 118         BT_ASSERT(ctfser);
 119         memset(ctfser, 0, sizeof(*ctfser));
 120         ctfser->fd = open(path, O_RDWR | O_CREAT | O_TRUNC,
 121                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
 122         ctfser->log_level = log_level;
 123         if (ctfser->fd < 0) {
 124                 BT_LOGW_ERRNO("Failed to open stream file for writing",
 125                         ": path=\"%s\", ret=%d",
 126                         path, ctfser->fd);
 127                 ret = -1;
 128                 goto end;
 129         }
 130
 131         ctfser->path = g_string_new(path);
 132
 133 end:
 134         return ret;
 135 }
 136
 137 BT_HIDDEN
 138 int bt_ctfser_fini(struct bt_ctfser *ctfser)
 139 {
 140         int ret = 0;
 141
 142         if (ctfser->fd == -1) {
 143                 goto free_path;
 144         }
 145
 146         if (ctfser->base_mma) {
 147                 /* Unmap old base */
 148                 ret = munmap_align(ctfser->base_mma);
 149                 if (ret) {
 150                         BT_LOGE_ERRNO("Failed to unmap stream file",
 151                                 ": ret=%d, size-bytes=%" PRIu64,
 152                                 ret, ctfser->stream_size_bytes);
 153                         goto end;
 154                 }
 155
 156                 ctfser->base_mma = NULL;
 157         }
 158
 159         /*
 160          * Truncate the stream file's size to the minimum required to
 161          * fit the last packet as we might have grown it too much during
 162          * the last memory map.
 163          */
 164         do {
 165                 ret = ftruncate(ctfser->fd, ctfser->stream_size_bytes);
 166         } while (ret == -1 && errno == EINTR);
 167
 168         if (ret) {
 169                 BT_LOGE_ERRNO("Failed to truncate stream file",
 170                         ": ret=%d, size-bytes=%" PRIu64,
 171                         ret, ctfser->stream_size_bytes);
 172                 goto end;
 173         }
 174
 175
 176         ret = close(ctfser->fd);
 177         if (ret) {
 178                 BT_LOGE_ERRNO("Failed to close stream file",
 179                         ": ret=%d", ret);
 180                 goto end;
 181         }
 182
 183         ctfser->fd = -1;
 184
 185 free_path:
 186         if (ctfser->path) {
 187                 g_string_free(ctfser->path, TRUE);
 188                 ctfser->path = NULL;
 189         }
 190
 191 end:
 192         return ret;
 193 }
 194
 195 BT_HIDDEN
 196 int bt_ctfser_open_packet(struct bt_ctfser *ctfser)
 197 {
 198         int ret = 0;
 199
 200         BT_LOGD("Opening packet: path=\"%s\", fd=%d, "
 201                 "prev-packet-size-bytes=%" PRIu64,
 202                 ctfser->path->str, ctfser->fd,
 203                 ctfser->prev_packet_size_bytes);
 204
 205         if (ctfser->base_mma) {
 206                 /* Unmap old base (previous packet) */
 207                 ret = munmap_align(ctfser->base_mma);
 208                 if (ret) {
 209                         BT_LOGE_ERRNO("Failed to unmap stream file",
 210                                 ": ret=%d, size-bytes=%" PRIu64,
 211                                 ret, ctfser->stream_size_bytes);
 212                         goto end;
 213                 }
 214
 215                 ctfser->base_mma = NULL;
 216         }
 217
 218         /*
 219          * Add the previous packet's size to the memory map address
 220          * offset to start writing immediately after it.
 221          */
 222         ctfser->mmap_offset += ctfser->prev_packet_size_bytes;
 223         ctfser->prev_packet_size_bytes = 0;
 224
 225         /* Make initial space for the current packet */
 226         ctfser->cur_packet_size_bytes = get_packet_size_increment_bytes(
 227                 ctfser);
 228
 229         do {
 230                 ret = bt_posix_fallocate(ctfser->fd, ctfser->mmap_offset,
 231                         ctfser->cur_packet_size_bytes);
 232         } while (ret == EINTR);
 233
 234         if (ret) {
 235                 BT_LOGE("Failed to preallocate memory space: ret=%d", ret);
 236                 goto end;
 237         }
 238
 239         /* Start writing at the beginning of the current packet */
 240         ctfser->offset_in_cur_packet_bits = 0;
 241
 242         /* Get new base address */
 243         mmap_align_ctfser(ctfser);
 244         if (ctfser->base_mma == MAP_FAILED) {
 245                 BT_LOGE_ERRNO("Failed to perform an aligned memory mapping",
 246                         ": ret=%d", ret);
 247                 ret = -1;
 248                 goto end;
 249         }
 250
 251         BT_LOGD("Opened packet: path=\"%s\", fd=%d, "
 252                 "cur-packet-size-bytes=%" PRIu64,
 253                 ctfser->path->str, ctfser->fd,
 254                 ctfser->cur_packet_size_bytes);
 255
 256 end:
 257         return ret;
 258 }
 259
 260 BT_HIDDEN
 261 void bt_ctfser_close_current_packet(struct bt_ctfser *ctfser,
 262                 uint64_t packet_size_bytes)
 263 {
 264         BT_LOGD("Closing packet: path=\"%s\", fd=%d, "
 265                 "offset-in-cur-packet-bits=%" PRIu64
 266                 "cur-packet-size-bytes=%" PRIu64,
 267                 ctfser->path->str, ctfser->fd,
 268                 ctfser->offset_in_cur_packet_bits,
 269                 ctfser->cur_packet_size_bytes);
 270
 271         /*
 272          * This will be used during the next call to
 273          * bt_ctfser_open_packet(): we add
 274          * `ctfser->prev_packet_size_bytes` to the current memory map
 275          * address offset (first byte of _this_ packet), effectively
 276          * making _this_ packet the required size.
 277          */
 278         ctfser->prev_packet_size_bytes = packet_size_bytes;
 279         ctfser->stream_size_bytes += packet_size_bytes;
 280         BT_LOGD("Closed packet: path=\"%s\", fd=%d, "
 281                 "stream-file-size-bytes=%" PRIu64,
 282                 ctfser->path->str, ctfser->fd,
 283                 ctfser->stream_size_bytes);
 284 }