block/qapi.c

   1 /*
   2  * Block layer qmp and info dump related functions
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   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
  19  * THE 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
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "block/qapi.h"
  26 #include "block/block_int.h"
  27 #include "qmp-commands.h"
  28 #include "qapi-visit.h"
  29 #include "qapi/qmp-output-visitor.h"
  30 #include "qapi/qmp/types.h"
  31 #include "sysemu/block-backend.h"
  32
  33 BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs)
  34 {
  35     BlockDeviceInfo *info = g_malloc0(sizeof(*info));
  36
  37     info->file                   = g_strdup(bs->filename);
  38     info->ro                     = bs->read_only;
  39     info->drv                    = g_strdup(bs->drv->format_name);
  40     info->encrypted              = bs->encrypted;
  41     info->encryption_key_missing = bdrv_key_required(bs);
  42
  43     if (bs->node_name[0]) {
  44         info->has_node_name = true;
  45         info->node_name = g_strdup(bs->node_name);
  46     }
  47
  48     if (bs->backing_file[0]) {
  49         info->has_backing_file = true;
  50         info->backing_file = g_strdup(bs->backing_file);
  51     }
  52
  53     info->backing_file_depth = bdrv_get_backing_file_depth(bs);
  54     info->detect_zeroes = bs->detect_zeroes;
  55
  56     if (bs->io_limits_enabled) {
  57         ThrottleConfig cfg;
  58         throttle_get_config(&bs->throttle_state, &cfg);
  59         info->bps     = cfg.buckets[THROTTLE_BPS_TOTAL].avg;
  60         info->bps_rd  = cfg.buckets[THROTTLE_BPS_READ].avg;
  61         info->bps_wr  = cfg.buckets[THROTTLE_BPS_WRITE].avg;
  62
  63         info->iops    = cfg.buckets[THROTTLE_OPS_TOTAL].avg;
  64         info->iops_rd = cfg.buckets[THROTTLE_OPS_READ].avg;
  65         info->iops_wr = cfg.buckets[THROTTLE_OPS_WRITE].avg;
  66
  67         info->has_bps_max     = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  68         info->bps_max         = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  69         info->has_bps_rd_max  = cfg.buckets[THROTTLE_BPS_READ].max;
  70         info->bps_rd_max      = cfg.buckets[THROTTLE_BPS_READ].max;
  71         info->has_bps_wr_max  = cfg.buckets[THROTTLE_BPS_WRITE].max;
  72         info->bps_wr_max      = cfg.buckets[THROTTLE_BPS_WRITE].max;
  73
  74         info->has_iops_max    = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  75         info->iops_max        = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  76         info->has_iops_rd_max = cfg.buckets[THROTTLE_OPS_READ].max;
  77         info->iops_rd_max     = cfg.buckets[THROTTLE_OPS_READ].max;
  78         info->has_iops_wr_max = cfg.buckets[THROTTLE_OPS_WRITE].max;
  79         info->iops_wr_max     = cfg.buckets[THROTTLE_OPS_WRITE].max;
  80
  81         info->has_iops_size = cfg.op_size;
  82         info->iops_size = cfg.op_size;
  83     }
  84
  85     return info;
  86 }
  87
  88 /*
  89  * Returns 0 on success, with *p_list either set to describe snapshot
  90  * information, or NULL because there are no snapshots.  Returns -errno on
  91  * error, with *p_list untouched.
  92  */
  93 int bdrv_query_snapshot_info_list(BlockDriverState *bs,
  94                                   SnapshotInfoList **p_list,
  95                                   Error **errp)
  96 {
  97     int i, sn_count;
  98     QEMUSnapshotInfo *sn_tab = NULL;
  99     SnapshotInfoList *info_list, *cur_item = NULL, *head = NULL;
 100     SnapshotInfo *info;
 101
 102     sn_count = bdrv_snapshot_list(bs, &sn_tab);
 103     if (sn_count < 0) {
 104         const char *dev = bdrv_get_device_name(bs);
 105         switch (sn_count) {
 106         case -ENOMEDIUM:
 107             error_setg(errp, "Device '%s' is not inserted", dev);
 108             break;
 109         case -ENOTSUP:
 110             error_setg(errp,
 111                        "Device '%s' does not support internal snapshots",
 112                        dev);
 113             break;
 114         default:
 115             error_setg_errno(errp, -sn_count,
 116                              "Can't list snapshots of device '%s'", dev);
 117             break;
 118         }
 119         return sn_count;
 120     }
 121
 122     for (i = 0; i < sn_count; i++) {
 123         info = g_new0(SnapshotInfo, 1);
 124         info->id            = g_strdup(sn_tab[i].id_str);
 125         info->name          = g_strdup(sn_tab[i].name);
 126         info->vm_state_size = sn_tab[i].vm_state_size;
 127         info->date_sec      = sn_tab[i].date_sec;
 128         info->date_nsec     = sn_tab[i].date_nsec;
 129         info->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
 130         info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
 131
 132         info_list = g_new0(SnapshotInfoList, 1);
 133         info_list->value = info;
 134
 135         /* XXX: waiting for the qapi to support qemu-queue.h types */
 136         if (!cur_item) {
 137             head = cur_item = info_list;
 138         } else {
 139             cur_item->next = info_list;
 140             cur_item = info_list;
 141         }
 142
 143     }
 144
 145     g_free(sn_tab);
 146     *p_list = head;
 147     return 0;
 148 }
 149
 150 /**
 151  * bdrv_query_image_info:
 152  * @bs: block device to examine
 153  * @p_info: location to store image information
 154  * @errp: location to store error information
 155  *
 156  * Store "flat" image information in @p_info.
 157  *
 158  * "Flat" means it does *not* query backing image information,
 159  * i.e. (*pinfo)->has_backing_image will be set to false and
 160  * (*pinfo)->backing_image to NULL even when the image does in fact have
 161  * a backing image.
 162  *
 163  * @p_info will be set only on success. On error, store error in @errp.
 164  */
 165 void bdrv_query_image_info(BlockDriverState *bs,
 166                            ImageInfo **p_info,
 167                            Error **errp)
 168 {
 169     int64_t size;
 170     const char *backing_filename;
 171     char backing_filename2[1024];
 172     BlockDriverInfo bdi;
 173     int ret;
 174     Error *err = NULL;
 175     ImageInfo *info;
 176
 177     size = bdrv_getlength(bs);
 178     if (size < 0) {
 179         error_setg_errno(errp, -size, "Can't get size of device '%s'",
 180                          bdrv_get_device_name(bs));
 181         return;
 182     }
 183
 184     info = g_new0(ImageInfo, 1);
 185     info->filename        = g_strdup(bs->filename);
 186     info->format          = g_strdup(bdrv_get_format_name(bs));
 187     info->virtual_size    = size;
 188     info->actual_size     = bdrv_get_allocated_file_size(bs);
 189     info->has_actual_size = info->actual_size >= 0;
 190     if (bdrv_is_encrypted(bs)) {
 191         info->encrypted = true;
 192         info->has_encrypted = true;
 193     }
 194     if (bdrv_get_info(bs, &bdi) >= 0) {
 195         if (bdi.cluster_size != 0) {
 196             info->cluster_size = bdi.cluster_size;
 197             info->has_cluster_size = true;
 198         }
 199         info->dirty_flag = bdi.is_dirty;
 200         info->has_dirty_flag = true;
 201     }
 202     info->format_specific     = bdrv_get_specific_info(bs);
 203     info->has_format_specific = info->format_specific != NULL;
 204
 205     backing_filename = bs->backing_file;
 206     if (backing_filename[0] != '\0') {
 207         info->backing_filename = g_strdup(backing_filename);
 208         info->has_backing_filename = true;
 209         bdrv_get_full_backing_filename(bs, backing_filename2,
 210                                        sizeof(backing_filename2));
 211
 212         if (strcmp(backing_filename, backing_filename2) != 0) {
 213             info->full_backing_filename =
 214                         g_strdup(backing_filename2);
 215             info->has_full_backing_filename = true;
 216         }
 217
 218         if (bs->backing_format[0]) {
 219             info->backing_filename_format = g_strdup(bs->backing_format);
 220             info->has_backing_filename_format = true;
 221         }
 222     }
 223
 224     ret = bdrv_query_snapshot_info_list(bs, &info->snapshots, &err);
 225     switch (ret) {
 226     case 0:
 227         if (info->snapshots) {
 228             info->has_snapshots = true;
 229         }
 230         break;
 231     /* recoverable error */
 232     case -ENOMEDIUM:
 233     case -ENOTSUP:
 234         error_free(err);
 235         break;
 236     default:
 237         error_propagate(errp, err);
 238         qapi_free_ImageInfo(info);
 239         return;
 240     }
 241
 242     *p_info = info;
 243 }
 244
 245 /* @p_info will be set only on success. */
 246 static void bdrv_query_info(BlockBackend *blk, BlockInfo **p_info,
 247                             Error **errp)
 248 {
 249     BlockInfo *info = g_malloc0(sizeof(*info));
 250     BlockDriverState *bs = blk_bs(blk);
 251     BlockDriverState *bs0;
 252     ImageInfo **p_image_info;
 253     Error *local_err = NULL;
 254     info->device = g_strdup(blk_name(blk));
 255     info->type = g_strdup("unknown");
 256     info->locked = blk_dev_is_medium_locked(blk);
 257     info->removable = blk_dev_has_removable_media(blk);
 258
 259     if (blk_dev_has_removable_media(blk)) {
 260         info->has_tray_open = true;
 261         info->tray_open = blk_dev_is_tray_open(blk);
 262     }
 263
 264     if (bdrv_iostatus_is_enabled(bs)) {
 265         info->has_io_status = true;
 266         info->io_status = bs->iostatus;
 267     }
 268
 269     if (!QLIST_EMPTY(&bs->dirty_bitmaps)) {
 270         info->has_dirty_bitmaps = true;
 271         info->dirty_bitmaps = bdrv_query_dirty_bitmaps(bs);
 272     }
 273
 274     if (bs->drv) {
 275         info->has_inserted = true;
 276         info->inserted = bdrv_block_device_info(bs);
 277
 278         bs0 = bs;
 279         p_image_info = &info->inserted->image;
 280         while (1) {
 281             bdrv_query_image_info(bs0, p_image_info, &local_err);
 282             if (local_err) {
 283                 error_propagate(errp, local_err);
 284                 goto err;
 285             }
 286             if (bs0->drv && bs0->backing_hd) {
 287                 bs0 = bs0->backing_hd;
 288                 (*p_image_info)->has_backing_image = true;
 289                 p_image_info = &((*p_image_info)->backing_image);
 290             } else {
 291                 break;
 292             }
 293         }
 294     }
 295
 296     *p_info = info;
 297     return;
 298
 299  err:
 300     qapi_free_BlockInfo(info);
 301 }
 302
 303 static BlockStats *bdrv_query_stats(const BlockDriverState *bs)
 304 {
 305     BlockStats *s;
 306
 307     s = g_malloc0(sizeof(*s));
 308
 309     if (bdrv_get_device_name(bs)[0]) {
 310         s->has_device = true;
 311         s->device = g_strdup(bdrv_get_device_name(bs));
 312     }
 313
 314     s->stats = g_malloc0(sizeof(*s->stats));
 315     s->stats->rd_bytes = bs->stats.nr_bytes[BLOCK_ACCT_READ];
 316     s->stats->wr_bytes = bs->stats.nr_bytes[BLOCK_ACCT_WRITE];
 317     s->stats->rd_operations = bs->stats.nr_ops[BLOCK_ACCT_READ];
 318     s->stats->wr_operations = bs->stats.nr_ops[BLOCK_ACCT_WRITE];
 319     s->stats->wr_highest_offset =
 320         bs->stats.wr_highest_sector * BDRV_SECTOR_SIZE;
 321     s->stats->flush_operations = bs->stats.nr_ops[BLOCK_ACCT_FLUSH];
 322     s->stats->wr_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_WRITE];
 323     s->stats->rd_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_READ];
 324     s->stats->flush_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_FLUSH];
 325
 326     if (bs->file) {
 327         s->has_parent = true;
 328         s->parent = bdrv_query_stats(bs->file);
 329     }
 330
 331     if (bs->backing_hd) {
 332         s->has_backing = true;
 333         s->backing = bdrv_query_stats(bs->backing_hd);
 334     }
 335
 336     return s;
 337 }
 338
 339 BlockInfoList *qmp_query_block(Error **errp)
 340 {
 341     BlockInfoList *head = NULL, **p_next = &head;
 342     BlockBackend *blk;
 343     Error *local_err = NULL;
 344
 345     for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
 346         BlockInfoList *info = g_malloc0(sizeof(*info));
 347         bdrv_query_info(blk, &info->value, &local_err);
 348         if (local_err) {
 349             error_propagate(errp, local_err);
 350             goto err;
 351         }
 352
 353         *p_next = info;
 354         p_next = &info->next;
 355     }
 356
 357     return head;
 358
 359  err:
 360     qapi_free_BlockInfoList(head);
 361     return NULL;
 362 }
 363
 364 BlockStatsList *qmp_query_blockstats(Error **errp)
 365 {
 366     BlockStatsList *head = NULL, **p_next = &head;
 367     BlockDriverState *bs = NULL;
 368
 369      while ((bs = bdrv_next(bs))) {
 370         BlockStatsList *info = g_malloc0(sizeof(*info));
 371         AioContext *ctx = bdrv_get_aio_context(bs);
 372
 373         aio_context_acquire(ctx);
 374         info->value = bdrv_query_stats(bs);
 375         aio_context_release(ctx);
 376
 377         *p_next = info;
 378         p_next = &info->next;
 379     }
 380
 381     return head;
 382 }
 383
 384 #define NB_SUFFIXES 4
 385
 386 static char *get_human_readable_size(char *buf, int buf_size, int64_t size)
 387 {
 388     static const char suffixes[NB_SUFFIXES] = "KMGT";
 389     int64_t base;
 390     int i;
 391
 392     if (size <= 999) {
 393         snprintf(buf, buf_size, "%" PRId64, size);
 394     } else {
 395         base = 1024;
 396         for (i = 0; i < NB_SUFFIXES; i++) {
 397             if (size < (10 * base)) {
 398                 snprintf(buf, buf_size, "%0.1f%c",
 399                          (double)size / base,
 400                          suffixes[i]);
 401                 break;
 402             } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
 403                 snprintf(buf, buf_size, "%" PRId64 "%c",
 404                          ((size + (base >> 1)) / base),
 405                          suffixes[i]);
 406                 break;
 407             }
 408             base = base * 1024;
 409         }
 410     }
 411     return buf;
 412 }
 413
 414 void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f,
 415                         QEMUSnapshotInfo *sn)
 416 {
 417     char buf1[128], date_buf[128], clock_buf[128];
 418     struct tm tm;
 419     time_t ti;
 420     int64_t secs;
 421
 422     if (!sn) {
 423         func_fprintf(f,
 424                      "%-10s%-20s%7s%20s%15s",
 425                      "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
 426     } else {
 427         ti = sn->date_sec;
 428         localtime_r(&ti, &tm);
 429         strftime(date_buf, sizeof(date_buf),
 430                  "%Y-%m-%d %H:%M:%S", &tm);
 431         secs = sn->vm_clock_nsec / 1000000000;
 432         snprintf(clock_buf, sizeof(clock_buf),
 433                  "%02d:%02d:%02d.%03d",
 434                  (int)(secs / 3600),
 435                  (int)((secs / 60) % 60),
 436                  (int)(secs % 60),
 437                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
 438         func_fprintf(f,
 439                      "%-10s%-20s%7s%20s%15s",
 440                      sn->id_str, sn->name,
 441                      get_human_readable_size(buf1, sizeof(buf1),
 442                                              sn->vm_state_size),
 443                      date_buf,
 444                      clock_buf);
 445     }
 446 }
 447
 448 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 449                        QDict *dict);
 450 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 451                        QList *list);
 452
 453 static void dump_qobject(fprintf_function func_fprintf, void *f,
 454                          int comp_indent, QObject *obj)
 455 {
 456     switch (qobject_type(obj)) {
 457         case QTYPE_QINT: {
 458             QInt *value = qobject_to_qint(obj);
 459             func_fprintf(f, "%" PRId64, qint_get_int(value));
 460             break;
 461         }
 462         case QTYPE_QSTRING: {
 463             QString *value = qobject_to_qstring(obj);
 464             func_fprintf(f, "%s", qstring_get_str(value));
 465             break;
 466         }
 467         case QTYPE_QDICT: {
 468             QDict *value = qobject_to_qdict(obj);
 469             dump_qdict(func_fprintf, f, comp_indent, value);
 470             break;
 471         }
 472         case QTYPE_QLIST: {
 473             QList *value = qobject_to_qlist(obj);
 474             dump_qlist(func_fprintf, f, comp_indent, value);
 475             break;
 476         }
 477         case QTYPE_QFLOAT: {
 478             QFloat *value = qobject_to_qfloat(obj);
 479             func_fprintf(f, "%g", qfloat_get_double(value));
 480             break;
 481         }
 482         case QTYPE_QBOOL: {
 483             QBool *value = qobject_to_qbool(obj);
 484             func_fprintf(f, "%s", qbool_get_int(value) ? "true" : "false");
 485             break;
 486         }
 487         case QTYPE_QERROR: {
 488             QString *value = qerror_human((QError *)obj);
 489             func_fprintf(f, "%s", qstring_get_str(value));
 490             QDECREF(value);
 491             break;
 492         }
 493         case QTYPE_NONE:
 494             break;
 495         case QTYPE_MAX:
 496         default:
 497             abort();
 498     }
 499 }
 500
 501 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 502                        QList *list)
 503 {
 504     const QListEntry *entry;
 505     int i = 0;
 506
 507     for (entry = qlist_first(list); entry; entry = qlist_next(entry), i++) {
 508         qtype_code type = qobject_type(entry->value);
 509         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 510         const char *format = composite ? "%*s[%i]:\n" : "%*s[%i]: ";
 511
 512         func_fprintf(f, format, indentation * 4, "", i);
 513         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 514         if (!composite) {
 515             func_fprintf(f, "\n");
 516         }
 517     }
 518 }
 519
 520 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 521                        QDict *dict)
 522 {
 523     const QDictEntry *entry;
 524
 525     for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
 526         qtype_code type = qobject_type(entry->value);
 527         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 528         const char *format = composite ? "%*s%s:\n" : "%*s%s: ";
 529         char key[strlen(entry->key) + 1];
 530         int i;
 531
 532         /* replace dashes with spaces in key (variable) names */
 533         for (i = 0; entry->key[i]; i++) {
 534             key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];
 535         }
 536         key[i] = 0;
 537
 538         func_fprintf(f, format, indentation * 4, "", key);
 539         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 540         if (!composite) {
 541             func_fprintf(f, "\n");
 542         }
 543     }
 544 }
 545
 546 void bdrv_image_info_specific_dump(fprintf_function func_fprintf, void *f,
 547                                    ImageInfoSpecific *info_spec)
 548 {
 549     QmpOutputVisitor *ov = qmp_output_visitor_new();
 550     QObject *obj, *data;
 551
 552     visit_type_ImageInfoSpecific(qmp_output_get_visitor(ov), &info_spec, NULL,
 553                                  &error_abort);
 554     obj = qmp_output_get_qobject(ov);
 555     assert(qobject_type(obj) == QTYPE_QDICT);
 556     data = qdict_get(qobject_to_qdict(obj), "data");
 557     dump_qobject(func_fprintf, f, 1, data);
 558     qmp_output_visitor_cleanup(ov);
 559 }
 560
 561 void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
 562                           ImageInfo *info)
 563 {
 564     char size_buf[128], dsize_buf[128];
 565     if (!info->has_actual_size) {
 566         snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
 567     } else {
 568         get_human_readable_size(dsize_buf, sizeof(dsize_buf),
 569                                 info->actual_size);
 570     }
 571     get_human_readable_size(size_buf, sizeof(size_buf), info->virtual_size);
 572     func_fprintf(f,
 573                  "image: %s\n"
 574                  "file format: %s\n"
 575                  "virtual size: %s (%" PRId64 " bytes)\n"
 576                  "disk size: %s\n",
 577                  info->filename, info->format, size_buf,
 578                  info->virtual_size,
 579                  dsize_buf);
 580
 581     if (info->has_encrypted && info->encrypted) {
 582         func_fprintf(f, "encrypted: yes\n");
 583     }
 584
 585     if (info->has_cluster_size) {
 586         func_fprintf(f, "cluster_size: %" PRId64 "\n",
 587                        info->cluster_size);
 588     }
 589
 590     if (info->has_dirty_flag && info->dirty_flag) {
 591         func_fprintf(f, "cleanly shut down: no\n");
 592     }
 593
 594     if (info->has_backing_filename) {
 595         func_fprintf(f, "backing file: %s", info->backing_filename);
 596         if (info->has_full_backing_filename) {
 597             func_fprintf(f, " (actual path: %s)", info->full_backing_filename);
 598         }
 599         func_fprintf(f, "\n");
 600         if (info->has_backing_filename_format) {
 601             func_fprintf(f, "backing file format: %s\n",
 602                          info->backing_filename_format);
 603         }
 604     }
 605
 606     if (info->has_snapshots) {
 607         SnapshotInfoList *elem;
 608
 609         func_fprintf(f, "Snapshot list:\n");
 610         bdrv_snapshot_dump(func_fprintf, f, NULL);
 611         func_fprintf(f, "\n");
 612
 613         /* Ideally bdrv_snapshot_dump() would operate on SnapshotInfoList but
 614          * we convert to the block layer's native QEMUSnapshotInfo for now.
 615          */
 616         for (elem = info->snapshots; elem; elem = elem->next) {
 617             QEMUSnapshotInfo sn = {
 618                 .vm_state_size = elem->value->vm_state_size,
 619                 .date_sec = elem->value->date_sec,
 620                 .date_nsec = elem->value->date_nsec,
 621                 .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL +
 622                                  elem->value->vm_clock_nsec,
 623             };
 624
 625             pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id);
 626             pstrcpy(sn.name, sizeof(sn.name), elem->value->name);
 627             bdrv_snapshot_dump(func_fprintf, f, &sn);
 628             func_fprintf(f, "\n");
 629         }
 630     }
 631
 632     if (info->has_format_specific) {
 633         func_fprintf(f, "Format specific information:\n");
 634         bdrv_image_info_specific_dump(func_fprintf, f, info->format_specific);
 635     }
 636 }