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
  32 BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs)
  33 {
  34     BlockDeviceInfo *info = g_malloc0(sizeof(*info));
  35
  36     info->file                   = g_strdup(bs->filename);
  37     info->ro                     = bs->read_only;
  38     info->drv                    = g_strdup(bs->drv->format_name);
  39     info->encrypted              = bs->encrypted;
  40     info->encryption_key_missing = bdrv_key_required(bs);
  41
  42     if (bs->node_name[0]) {
  43         info->has_node_name = true;
  44         info->node_name = g_strdup(bs->node_name);
  45     }
  46
  47     if (bs->backing_file[0]) {
  48         info->has_backing_file = true;
  49         info->backing_file = g_strdup(bs->backing_file);
  50     }
  51
  52     info->backing_file_depth = bdrv_get_backing_file_depth(bs);
  53
  54     if (bs->io_limits_enabled) {
  55         ThrottleConfig cfg;
  56         throttle_get_config(&bs->throttle_state, &cfg);
  57         info->bps     = cfg.buckets[THROTTLE_BPS_TOTAL].avg;
  58         info->bps_rd  = cfg.buckets[THROTTLE_BPS_READ].avg;
  59         info->bps_wr  = cfg.buckets[THROTTLE_BPS_WRITE].avg;
  60
  61         info->iops    = cfg.buckets[THROTTLE_OPS_TOTAL].avg;
  62         info->iops_rd = cfg.buckets[THROTTLE_OPS_READ].avg;
  63         info->iops_wr = cfg.buckets[THROTTLE_OPS_WRITE].avg;
  64
  65         info->has_bps_max     = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  66         info->bps_max         = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  67         info->has_bps_rd_max  = cfg.buckets[THROTTLE_BPS_READ].max;
  68         info->bps_rd_max      = cfg.buckets[THROTTLE_BPS_READ].max;
  69         info->has_bps_wr_max  = cfg.buckets[THROTTLE_BPS_WRITE].max;
  70         info->bps_wr_max      = cfg.buckets[THROTTLE_BPS_WRITE].max;
  71
  72         info->has_iops_max    = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  73         info->iops_max        = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  74         info->has_iops_rd_max = cfg.buckets[THROTTLE_OPS_READ].max;
  75         info->iops_rd_max     = cfg.buckets[THROTTLE_OPS_READ].max;
  76         info->has_iops_wr_max = cfg.buckets[THROTTLE_OPS_WRITE].max;
  77         info->iops_wr_max     = cfg.buckets[THROTTLE_OPS_WRITE].max;
  78
  79         info->has_iops_size = cfg.op_size;
  80         info->iops_size = cfg.op_size;
  81     }
  82
  83     return info;
  84 }
  85
  86 /*
  87  * Returns 0 on success, with *p_list either set to describe snapshot
  88  * information, or NULL because there are no snapshots.  Returns -errno on
  89  * error, with *p_list untouched.
  90  */
  91 int bdrv_query_snapshot_info_list(BlockDriverState *bs,
  92                                   SnapshotInfoList **p_list,
  93                                   Error **errp)
  94 {
  95     int i, sn_count;
  96     QEMUSnapshotInfo *sn_tab = NULL;
  97     SnapshotInfoList *info_list, *cur_item = NULL, *head = NULL;
  98     SnapshotInfo *info;
  99
 100     sn_count = bdrv_snapshot_list(bs, &sn_tab);
 101     if (sn_count < 0) {
 102         const char *dev = bdrv_get_device_name(bs);
 103         switch (sn_count) {
 104         case -ENOMEDIUM:
 105             error_setg(errp, "Device '%s' is not inserted", dev);
 106             break;
 107         case -ENOTSUP:
 108             error_setg(errp,
 109                        "Device '%s' does not support internal snapshots",
 110                        dev);
 111             break;
 112         default:
 113             error_setg_errno(errp, -sn_count,
 114                              "Can't list snapshots of device '%s'", dev);
 115             break;
 116         }
 117         return sn_count;
 118     }
 119
 120     for (i = 0; i < sn_count; i++) {
 121         info = g_new0(SnapshotInfo, 1);
 122         info->id            = g_strdup(sn_tab[i].id_str);
 123         info->name          = g_strdup(sn_tab[i].name);
 124         info->vm_state_size = sn_tab[i].vm_state_size;
 125         info->date_sec      = sn_tab[i].date_sec;
 126         info->date_nsec     = sn_tab[i].date_nsec;
 127         info->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
 128         info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
 129
 130         info_list = g_new0(SnapshotInfoList, 1);
 131         info_list->value = info;
 132
 133         /* XXX: waiting for the qapi to support qemu-queue.h types */
 134         if (!cur_item) {
 135             head = cur_item = info_list;
 136         } else {
 137             cur_item->next = info_list;
 138             cur_item = info_list;
 139         }
 140
 141     }
 142
 143     g_free(sn_tab);
 144     *p_list = head;
 145     return 0;
 146 }
 147
 148 /**
 149  * bdrv_query_image_info:
 150  * @bs: block device to examine
 151  * @p_info: location to store image information
 152  * @errp: location to store error information
 153  *
 154  * Store "flat" image information in @p_info.
 155  *
 156  * "Flat" means it does *not* query backing image information,
 157  * i.e. (*pinfo)->has_backing_image will be set to false and
 158  * (*pinfo)->backing_image to NULL even when the image does in fact have
 159  * a backing image.
 160  *
 161  * @p_info will be set only on success. On error, store error in @errp.
 162  */
 163 void bdrv_query_image_info(BlockDriverState *bs,
 164                            ImageInfo **p_info,
 165                            Error **errp)
 166 {
 167     uint64_t total_sectors;
 168     const char *backing_filename;
 169     char backing_filename2[1024];
 170     BlockDriverInfo bdi;
 171     int ret;
 172     Error *err = NULL;
 173     ImageInfo *info = g_new0(ImageInfo, 1);
 174
 175     bdrv_get_geometry(bs, &total_sectors);
 176
 177     info->filename        = g_strdup(bs->filename);
 178     info->format          = g_strdup(bdrv_get_format_name(bs));
 179     info->virtual_size    = total_sectors * 512;
 180     info->actual_size     = bdrv_get_allocated_file_size(bs);
 181     info->has_actual_size = info->actual_size >= 0;
 182     if (bdrv_is_encrypted(bs)) {
 183         info->encrypted = true;
 184         info->has_encrypted = true;
 185     }
 186     if (bdrv_get_info(bs, &bdi) >= 0) {
 187         if (bdi.cluster_size != 0) {
 188             info->cluster_size = bdi.cluster_size;
 189             info->has_cluster_size = true;
 190         }
 191         info->dirty_flag = bdi.is_dirty;
 192         info->has_dirty_flag = true;
 193     }
 194     info->format_specific     = bdrv_get_specific_info(bs);
 195     info->has_format_specific = info->format_specific != NULL;
 196
 197     backing_filename = bs->backing_file;
 198     if (backing_filename[0] != '\0') {
 199         info->backing_filename = g_strdup(backing_filename);
 200         info->has_backing_filename = true;
 201         bdrv_get_full_backing_filename(bs, backing_filename2,
 202                                        sizeof(backing_filename2));
 203
 204         if (strcmp(backing_filename, backing_filename2) != 0) {
 205             info->full_backing_filename =
 206                         g_strdup(backing_filename2);
 207             info->has_full_backing_filename = true;
 208         }
 209
 210         if (bs->backing_format[0]) {
 211             info->backing_filename_format = g_strdup(bs->backing_format);
 212             info->has_backing_filename_format = true;
 213         }
 214     }
 215
 216     ret = bdrv_query_snapshot_info_list(bs, &info->snapshots, &err);
 217     switch (ret) {
 218     case 0:
 219         if (info->snapshots) {
 220             info->has_snapshots = true;
 221         }
 222         break;
 223     /* recoverable error */
 224     case -ENOMEDIUM:
 225     case -ENOTSUP:
 226         error_free(err);
 227         break;
 228     default:
 229         error_propagate(errp, err);
 230         qapi_free_ImageInfo(info);
 231         return;
 232     }
 233
 234     *p_info = info;
 235 }
 236
 237 /* @p_info will be set only on success. */
 238 void bdrv_query_info(BlockDriverState *bs,
 239                      BlockInfo **p_info,
 240                      Error **errp)
 241 {
 242     BlockInfo *info = g_malloc0(sizeof(*info));
 243     BlockDriverState *bs0;
 244     ImageInfo **p_image_info;
 245     Error *local_err = NULL;
 246     info->device = g_strdup(bs->device_name);
 247     info->type = g_strdup("unknown");
 248     info->locked = bdrv_dev_is_medium_locked(bs);
 249     info->removable = bdrv_dev_has_removable_media(bs);
 250
 251     if (bdrv_dev_has_removable_media(bs)) {
 252         info->has_tray_open = true;
 253         info->tray_open = bdrv_dev_is_tray_open(bs);
 254     }
 255
 256     if (bdrv_iostatus_is_enabled(bs)) {
 257         info->has_io_status = true;
 258         info->io_status = bs->iostatus;
 259     }
 260
 261     if (!QLIST_EMPTY(&bs->dirty_bitmaps)) {
 262         info->has_dirty_bitmaps = true;
 263         info->dirty_bitmaps = bdrv_query_dirty_bitmaps(bs);
 264     }
 265
 266     if (bs->drv) {
 267         info->has_inserted = true;
 268         info->inserted = bdrv_block_device_info(bs);
 269
 270         bs0 = bs;
 271         p_image_info = &info->inserted->image;
 272         while (1) {
 273             bdrv_query_image_info(bs0, p_image_info, &local_err);
 274             if (local_err) {
 275                 error_propagate(errp, local_err);
 276                 goto err;
 277             }
 278             if (bs0->drv && bs0->backing_hd) {
 279                 bs0 = bs0->backing_hd;
 280                 (*p_image_info)->has_backing_image = true;
 281                 p_image_info = &((*p_image_info)->backing_image);
 282             } else {
 283                 break;
 284             }
 285         }
 286     }
 287
 288     *p_info = info;
 289     return;
 290
 291  err:
 292     qapi_free_BlockInfo(info);
 293 }
 294
 295 BlockStats *bdrv_query_stats(const BlockDriverState *bs)
 296 {
 297     BlockStats *s;
 298
 299     s = g_malloc0(sizeof(*s));
 300
 301     if (bs->device_name[0]) {
 302         s->has_device = true;
 303         s->device = g_strdup(bs->device_name);
 304     }
 305
 306     s->stats = g_malloc0(sizeof(*s->stats));
 307     s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ];
 308     s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE];
 309     s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ];
 310     s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE];
 311     s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE;
 312     s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH];
 313     s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE];
 314     s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ];
 315     s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH];
 316
 317     if (bs->file) {
 318         s->has_parent = true;
 319         s->parent = bdrv_query_stats(bs->file);
 320     }
 321
 322     if (bs->backing_hd) {
 323         s->has_backing = true;
 324         s->backing = bdrv_query_stats(bs->backing_hd);
 325     }
 326
 327     return s;
 328 }
 329
 330 BlockInfoList *qmp_query_block(Error **errp)
 331 {
 332     BlockInfoList *head = NULL, **p_next = &head;
 333     BlockDriverState *bs = NULL;
 334     Error *local_err = NULL;
 335
 336      while ((bs = bdrv_next(bs))) {
 337         BlockInfoList *info = g_malloc0(sizeof(*info));
 338         bdrv_query_info(bs, &info->value, &local_err);
 339         if (local_err) {
 340             error_propagate(errp, local_err);
 341             goto err;
 342         }
 343
 344         *p_next = info;
 345         p_next = &info->next;
 346     }
 347
 348     return head;
 349
 350  err:
 351     qapi_free_BlockInfoList(head);
 352     return NULL;
 353 }
 354
 355 BlockStatsList *qmp_query_blockstats(Error **errp)
 356 {
 357     BlockStatsList *head = NULL, **p_next = &head;
 358     BlockDriverState *bs = NULL;
 359
 360      while ((bs = bdrv_next(bs))) {
 361         BlockStatsList *info = g_malloc0(sizeof(*info));
 362         info->value = bdrv_query_stats(bs);
 363
 364         *p_next = info;
 365         p_next = &info->next;
 366     }
 367
 368     return head;
 369 }
 370
 371 #define NB_SUFFIXES 4
 372
 373 static char *get_human_readable_size(char *buf, int buf_size, int64_t size)
 374 {
 375     static const char suffixes[NB_SUFFIXES] = "KMGT";
 376     int64_t base;
 377     int i;
 378
 379     if (size <= 999) {
 380         snprintf(buf, buf_size, "%" PRId64, size);
 381     } else {
 382         base = 1024;
 383         for (i = 0; i < NB_SUFFIXES; i++) {
 384             if (size < (10 * base)) {
 385                 snprintf(buf, buf_size, "%0.1f%c",
 386                          (double)size / base,
 387                          suffixes[i]);
 388                 break;
 389             } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
 390                 snprintf(buf, buf_size, "%" PRId64 "%c",
 391                          ((size + (base >> 1)) / base),
 392                          suffixes[i]);
 393                 break;
 394             }
 395             base = base * 1024;
 396         }
 397     }
 398     return buf;
 399 }
 400
 401 void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f,
 402                         QEMUSnapshotInfo *sn)
 403 {
 404     char buf1[128], date_buf[128], clock_buf[128];
 405     struct tm tm;
 406     time_t ti;
 407     int64_t secs;
 408
 409     if (!sn) {
 410         func_fprintf(f,
 411                      "%-10s%-20s%7s%20s%15s",
 412                      "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
 413     } else {
 414         ti = sn->date_sec;
 415         localtime_r(&ti, &tm);
 416         strftime(date_buf, sizeof(date_buf),
 417                  "%Y-%m-%d %H:%M:%S", &tm);
 418         secs = sn->vm_clock_nsec / 1000000000;
 419         snprintf(clock_buf, sizeof(clock_buf),
 420                  "%02d:%02d:%02d.%03d",
 421                  (int)(secs / 3600),
 422                  (int)((secs / 60) % 60),
 423                  (int)(secs % 60),
 424                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
 425         func_fprintf(f,
 426                      "%-10s%-20s%7s%20s%15s",
 427                      sn->id_str, sn->name,
 428                      get_human_readable_size(buf1, sizeof(buf1),
 429                                              sn->vm_state_size),
 430                      date_buf,
 431                      clock_buf);
 432     }
 433 }
 434
 435 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 436                        QDict *dict);
 437 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 438                        QList *list);
 439
 440 static void dump_qobject(fprintf_function func_fprintf, void *f,
 441                          int comp_indent, QObject *obj)
 442 {
 443     switch (qobject_type(obj)) {
 444         case QTYPE_QINT: {
 445             QInt *value = qobject_to_qint(obj);
 446             func_fprintf(f, "%" PRId64, qint_get_int(value));
 447             break;
 448         }
 449         case QTYPE_QSTRING: {
 450             QString *value = qobject_to_qstring(obj);
 451             func_fprintf(f, "%s", qstring_get_str(value));
 452             break;
 453         }
 454         case QTYPE_QDICT: {
 455             QDict *value = qobject_to_qdict(obj);
 456             dump_qdict(func_fprintf, f, comp_indent, value);
 457             break;
 458         }
 459         case QTYPE_QLIST: {
 460             QList *value = qobject_to_qlist(obj);
 461             dump_qlist(func_fprintf, f, comp_indent, value);
 462             break;
 463         }
 464         case QTYPE_QFLOAT: {
 465             QFloat *value = qobject_to_qfloat(obj);
 466             func_fprintf(f, "%g", qfloat_get_double(value));
 467             break;
 468         }
 469         case QTYPE_QBOOL: {
 470             QBool *value = qobject_to_qbool(obj);
 471             func_fprintf(f, "%s", qbool_get_int(value) ? "true" : "false");
 472             break;
 473         }
 474         case QTYPE_QERROR: {
 475             QString *value = qerror_human((QError *)obj);
 476             func_fprintf(f, "%s", qstring_get_str(value));
 477             break;
 478         }
 479         case QTYPE_NONE:
 480             break;
 481         case QTYPE_MAX:
 482         default:
 483             abort();
 484     }
 485 }
 486
 487 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 488                        QList *list)
 489 {
 490     const QListEntry *entry;
 491     int i = 0;
 492
 493     for (entry = qlist_first(list); entry; entry = qlist_next(entry), i++) {
 494         qtype_code type = qobject_type(entry->value);
 495         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 496         const char *format = composite ? "%*s[%i]:\n" : "%*s[%i]: ";
 497
 498         func_fprintf(f, format, indentation * 4, "", i);
 499         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 500         if (!composite) {
 501             func_fprintf(f, "\n");
 502         }
 503     }
 504 }
 505
 506 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 507                        QDict *dict)
 508 {
 509     const QDictEntry *entry;
 510
 511     for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
 512         qtype_code type = qobject_type(entry->value);
 513         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 514         const char *format = composite ? "%*s%s:\n" : "%*s%s: ";
 515         char key[strlen(entry->key) + 1];
 516         int i;
 517
 518         /* replace dashes with spaces in key (variable) names */
 519         for (i = 0; entry->key[i]; i++) {
 520             key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];
 521         }
 522         key[i] = 0;
 523
 524         func_fprintf(f, format, indentation * 4, "", key);
 525         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 526         if (!composite) {
 527             func_fprintf(f, "\n");
 528         }
 529     }
 530 }
 531
 532 void bdrv_image_info_specific_dump(fprintf_function func_fprintf, void *f,
 533                                    ImageInfoSpecific *info_spec)
 534 {
 535     Error *local_err = NULL;
 536     QmpOutputVisitor *ov = qmp_output_visitor_new();
 537     QObject *obj, *data;
 538
 539     visit_type_ImageInfoSpecific(qmp_output_get_visitor(ov), &info_spec, NULL,
 540                                  &local_err);
 541     obj = qmp_output_get_qobject(ov);
 542     assert(qobject_type(obj) == QTYPE_QDICT);
 543     data = qdict_get(qobject_to_qdict(obj), "data");
 544     dump_qobject(func_fprintf, f, 1, data);
 545     qmp_output_visitor_cleanup(ov);
 546 }
 547
 548 void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
 549                           ImageInfo *info)
 550 {
 551     char size_buf[128], dsize_buf[128];
 552     if (!info->has_actual_size) {
 553         snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
 554     } else {
 555         get_human_readable_size(dsize_buf, sizeof(dsize_buf),
 556                                 info->actual_size);
 557     }
 558     get_human_readable_size(size_buf, sizeof(size_buf), info->virtual_size);
 559     func_fprintf(f,
 560                  "image: %s\n"
 561                  "file format: %s\n"
 562                  "virtual size: %s (%" PRId64 " bytes)\n"
 563                  "disk size: %s\n",
 564                  info->filename, info->format, size_buf,
 565                  info->virtual_size,
 566                  dsize_buf);
 567
 568     if (info->has_encrypted && info->encrypted) {
 569         func_fprintf(f, "encrypted: yes\n");
 570     }
 571
 572     if (info->has_cluster_size) {
 573         func_fprintf(f, "cluster_size: %" PRId64 "\n",
 574                        info->cluster_size);
 575     }
 576
 577     if (info->has_dirty_flag && info->dirty_flag) {
 578         func_fprintf(f, "cleanly shut down: no\n");
 579     }
 580
 581     if (info->has_backing_filename) {
 582         func_fprintf(f, "backing file: %s", info->backing_filename);
 583         if (info->has_full_backing_filename) {
 584             func_fprintf(f, " (actual path: %s)", info->full_backing_filename);
 585         }
 586         func_fprintf(f, "\n");
 587         if (info->has_backing_filename_format) {
 588             func_fprintf(f, "backing file format: %s\n",
 589                          info->backing_filename_format);
 590         }
 591     }
 592
 593     if (info->has_snapshots) {
 594         SnapshotInfoList *elem;
 595
 596         func_fprintf(f, "Snapshot list:\n");
 597         bdrv_snapshot_dump(func_fprintf, f, NULL);
 598         func_fprintf(f, "\n");
 599
 600         /* Ideally bdrv_snapshot_dump() would operate on SnapshotInfoList but
 601          * we convert to the block layer's native QEMUSnapshotInfo for now.
 602          */
 603         for (elem = info->snapshots; elem; elem = elem->next) {
 604             QEMUSnapshotInfo sn = {
 605                 .vm_state_size = elem->value->vm_state_size,
 606                 .date_sec = elem->value->date_sec,
 607                 .date_nsec = elem->value->date_nsec,
 608                 .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL +
 609                                  elem->value->vm_clock_nsec,
 610             };
 611
 612             pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id);
 613             pstrcpy(sn.name, sizeof(sn.name), elem->value->name);
 614             bdrv_snapshot_dump(func_fprintf, f, &sn);
 615             func_fprintf(f, "\n");
 616         }
 617     }
 618
 619     if (info->has_format_specific) {
 620         func_fprintf(f, "Format specific information:\n");
 621         bdrv_image_info_specific_dump(func_fprintf, f, info->format_specific);
 622     }
 623 }