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 #ifdef __linux__
  32 #include <linux/fs.h>
  33 #include <sys/ioctl.h>
  34 #ifndef FS_NOCOW_FL
  35 #define FS_NOCOW_FL                     0x00800000 /* Do not cow file */
  36 #endif
  37 #endif
  38
  39 BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs)
  40 {
  41     BlockDeviceInfo *info = g_malloc0(sizeof(*info));
  42
  43     info->file                   = g_strdup(bs->filename);
  44     info->ro                     = bs->read_only;
  45     info->drv                    = g_strdup(bs->drv->format_name);
  46     info->encrypted              = bs->encrypted;
  47     info->encryption_key_missing = bdrv_key_required(bs);
  48
  49     if (bs->node_name[0]) {
  50         info->has_node_name = true;
  51         info->node_name = g_strdup(bs->node_name);
  52     }
  53
  54     if (bs->backing_file[0]) {
  55         info->has_backing_file = true;
  56         info->backing_file = g_strdup(bs->backing_file);
  57     }
  58
  59     info->backing_file_depth = bdrv_get_backing_file_depth(bs);
  60     info->detect_zeroes = bs->detect_zeroes;
  61
  62     if (bs->io_limits_enabled) {
  63         ThrottleConfig cfg;
  64         throttle_get_config(&bs->throttle_state, &cfg);
  65         info->bps     = cfg.buckets[THROTTLE_BPS_TOTAL].avg;
  66         info->bps_rd  = cfg.buckets[THROTTLE_BPS_READ].avg;
  67         info->bps_wr  = cfg.buckets[THROTTLE_BPS_WRITE].avg;
  68
  69         info->iops    = cfg.buckets[THROTTLE_OPS_TOTAL].avg;
  70         info->iops_rd = cfg.buckets[THROTTLE_OPS_READ].avg;
  71         info->iops_wr = cfg.buckets[THROTTLE_OPS_WRITE].avg;
  72
  73         info->has_bps_max     = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  74         info->bps_max         = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  75         info->has_bps_rd_max  = cfg.buckets[THROTTLE_BPS_READ].max;
  76         info->bps_rd_max      = cfg.buckets[THROTTLE_BPS_READ].max;
  77         info->has_bps_wr_max  = cfg.buckets[THROTTLE_BPS_WRITE].max;
  78         info->bps_wr_max      = cfg.buckets[THROTTLE_BPS_WRITE].max;
  79
  80         info->has_iops_max    = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  81         info->iops_max        = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  82         info->has_iops_rd_max = cfg.buckets[THROTTLE_OPS_READ].max;
  83         info->iops_rd_max     = cfg.buckets[THROTTLE_OPS_READ].max;
  84         info->has_iops_wr_max = cfg.buckets[THROTTLE_OPS_WRITE].max;
  85         info->iops_wr_max     = cfg.buckets[THROTTLE_OPS_WRITE].max;
  86
  87         info->has_iops_size = cfg.op_size;
  88         info->iops_size = cfg.op_size;
  89     }
  90
  91     return info;
  92 }
  93
  94 /*
  95  * Returns 0 on success, with *p_list either set to describe snapshot
  96  * information, or NULL because there are no snapshots.  Returns -errno on
  97  * error, with *p_list untouched.
  98  */
  99 int bdrv_query_snapshot_info_list(BlockDriverState *bs,
 100                                   SnapshotInfoList **p_list,
 101                                   Error **errp)
 102 {
 103     int i, sn_count;
 104     QEMUSnapshotInfo *sn_tab = NULL;
 105     SnapshotInfoList *info_list, *cur_item = NULL, *head = NULL;
 106     SnapshotInfo *info;
 107
 108     sn_count = bdrv_snapshot_list(bs, &sn_tab);
 109     if (sn_count < 0) {
 110         const char *dev = bdrv_get_device_name(bs);
 111         switch (sn_count) {
 112         case -ENOMEDIUM:
 113             error_setg(errp, "Device '%s' is not inserted", dev);
 114             break;
 115         case -ENOTSUP:
 116             error_setg(errp,
 117                        "Device '%s' does not support internal snapshots",
 118                        dev);
 119             break;
 120         default:
 121             error_setg_errno(errp, -sn_count,
 122                              "Can't list snapshots of device '%s'", dev);
 123             break;
 124         }
 125         return sn_count;
 126     }
 127
 128     for (i = 0; i < sn_count; i++) {
 129         info = g_new0(SnapshotInfo, 1);
 130         info->id            = g_strdup(sn_tab[i].id_str);
 131         info->name          = g_strdup(sn_tab[i].name);
 132         info->vm_state_size = sn_tab[i].vm_state_size;
 133         info->date_sec      = sn_tab[i].date_sec;
 134         info->date_nsec     = sn_tab[i].date_nsec;
 135         info->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
 136         info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
 137
 138         info_list = g_new0(SnapshotInfoList, 1);
 139         info_list->value = info;
 140
 141         /* XXX: waiting for the qapi to support qemu-queue.h types */
 142         if (!cur_item) {
 143             head = cur_item = info_list;
 144         } else {
 145             cur_item->next = info_list;
 146             cur_item = info_list;
 147         }
 148
 149     }
 150
 151     g_free(sn_tab);
 152     *p_list = head;
 153     return 0;
 154 }
 155
 156 /**
 157  * bdrv_query_image_info:
 158  * @bs: block device to examine
 159  * @p_info: location to store image information
 160  * @errp: location to store error information
 161  *
 162  * Store "flat" image information in @p_info.
 163  *
 164  * "Flat" means it does *not* query backing image information,
 165  * i.e. (*pinfo)->has_backing_image will be set to false and
 166  * (*pinfo)->backing_image to NULL even when the image does in fact have
 167  * a backing image.
 168  *
 169  * @p_info will be set only on success. On error, store error in @errp.
 170  */
 171 void bdrv_query_image_info(BlockDriverState *bs,
 172                            ImageInfo **p_info,
 173                            Error **errp)
 174 {
 175     int64_t size;
 176     const char *backing_filename;
 177     char backing_filename2[1024];
 178     BlockDriverInfo bdi;
 179     int ret;
 180     Error *err = NULL;
 181     ImageInfo *info;
 182 #ifdef __linux__
 183     int fd, attr;
 184 #endif
 185
 186     size = bdrv_getlength(bs);
 187     if (size < 0) {
 188         error_setg_errno(errp, -size, "Can't get size of device '%s'",
 189                          bdrv_get_device_name(bs));
 190         return;
 191     }
 192
 193     info = g_new0(ImageInfo, 1);
 194     info->filename        = g_strdup(bs->filename);
 195     info->format          = g_strdup(bdrv_get_format_name(bs));
 196     info->virtual_size    = size;
 197     info->actual_size     = bdrv_get_allocated_file_size(bs);
 198     info->has_actual_size = info->actual_size >= 0;
 199     if (bdrv_is_encrypted(bs)) {
 200         info->encrypted = true;
 201         info->has_encrypted = true;
 202     }
 203     if (bdrv_get_info(bs, &bdi) >= 0) {
 204         if (bdi.cluster_size != 0) {
 205             info->cluster_size = bdi.cluster_size;
 206             info->has_cluster_size = true;
 207         }
 208         info->dirty_flag = bdi.is_dirty;
 209         info->has_dirty_flag = true;
 210     }
 211     info->format_specific     = bdrv_get_specific_info(bs);
 212     info->has_format_specific = info->format_specific != NULL;
 213
 214 #ifdef __linux__
 215     /* get NOCOW info */
 216     fd = qemu_open(bs->filename, O_RDONLY | O_NONBLOCK);
 217     if (fd >= 0) {
 218         if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0 && (attr & FS_NOCOW_FL)) {
 219             info->has_nocow = true;
 220             info->nocow = true;
 221         }
 222         qemu_close(fd);
 223     }
 224 #endif
 225
 226     backing_filename = bs->backing_file;
 227     if (backing_filename[0] != '\0') {
 228         info->backing_filename = g_strdup(backing_filename);
 229         info->has_backing_filename = true;
 230         bdrv_get_full_backing_filename(bs, backing_filename2,
 231                                        sizeof(backing_filename2));
 232
 233         if (strcmp(backing_filename, backing_filename2) != 0) {
 234             info->full_backing_filename =
 235                         g_strdup(backing_filename2);
 236             info->has_full_backing_filename = true;
 237         }
 238
 239         if (bs->backing_format[0]) {
 240             info->backing_filename_format = g_strdup(bs->backing_format);
 241             info->has_backing_filename_format = true;
 242         }
 243     }
 244
 245     ret = bdrv_query_snapshot_info_list(bs, &info->snapshots, &err);
 246     switch (ret) {
 247     case 0:
 248         if (info->snapshots) {
 249             info->has_snapshots = true;
 250         }
 251         break;
 252     /* recoverable error */
 253     case -ENOMEDIUM:
 254     case -ENOTSUP:
 255         error_free(err);
 256         break;
 257     default:
 258         error_propagate(errp, err);
 259         qapi_free_ImageInfo(info);
 260         return;
 261     }
 262
 263     *p_info = info;
 264 }
 265
 266 /* @p_info will be set only on success. */
 267 void bdrv_query_info(BlockDriverState *bs,
 268                      BlockInfo **p_info,
 269                      Error **errp)
 270 {
 271     BlockInfo *info = g_malloc0(sizeof(*info));
 272     BlockDriverState *bs0;
 273     ImageInfo **p_image_info;
 274     Error *local_err = NULL;
 275     info->device = g_strdup(bs->device_name);
 276     info->type = g_strdup("unknown");
 277     info->locked = bdrv_dev_is_medium_locked(bs);
 278     info->removable = bdrv_dev_has_removable_media(bs);
 279
 280     if (bdrv_dev_has_removable_media(bs)) {
 281         info->has_tray_open = true;
 282         info->tray_open = bdrv_dev_is_tray_open(bs);
 283     }
 284
 285     if (bdrv_iostatus_is_enabled(bs)) {
 286         info->has_io_status = true;
 287         info->io_status = bs->iostatus;
 288     }
 289
 290     if (!QLIST_EMPTY(&bs->dirty_bitmaps)) {
 291         info->has_dirty_bitmaps = true;
 292         info->dirty_bitmaps = bdrv_query_dirty_bitmaps(bs);
 293     }
 294
 295     if (bs->drv) {
 296         info->has_inserted = true;
 297         info->inserted = bdrv_block_device_info(bs);
 298
 299         bs0 = bs;
 300         p_image_info = &info->inserted->image;
 301         while (1) {
 302             bdrv_query_image_info(bs0, p_image_info, &local_err);
 303             if (local_err) {
 304                 error_propagate(errp, local_err);
 305                 goto err;
 306             }
 307             if (bs0->drv && bs0->backing_hd) {
 308                 bs0 = bs0->backing_hd;
 309                 (*p_image_info)->has_backing_image = true;
 310                 p_image_info = &((*p_image_info)->backing_image);
 311             } else {
 312                 break;
 313             }
 314         }
 315     }
 316
 317     *p_info = info;
 318     return;
 319
 320  err:
 321     qapi_free_BlockInfo(info);
 322 }
 323
 324 static BlockStats *bdrv_query_stats(const BlockDriverState *bs)
 325 {
 326     BlockStats *s;
 327
 328     s = g_malloc0(sizeof(*s));
 329
 330     if (bs->device_name[0]) {
 331         s->has_device = true;
 332         s->device = g_strdup(bs->device_name);
 333     }
 334
 335     s->stats = g_malloc0(sizeof(*s->stats));
 336     s->stats->rd_bytes = bs->stats.nr_bytes[BLOCK_ACCT_READ];
 337     s->stats->wr_bytes = bs->stats.nr_bytes[BLOCK_ACCT_WRITE];
 338     s->stats->rd_operations = bs->stats.nr_ops[BLOCK_ACCT_READ];
 339     s->stats->wr_operations = bs->stats.nr_ops[BLOCK_ACCT_WRITE];
 340     s->stats->wr_highest_offset =
 341         bs->stats.wr_highest_sector * BDRV_SECTOR_SIZE;
 342     s->stats->flush_operations = bs->stats.nr_ops[BLOCK_ACCT_FLUSH];
 343     s->stats->wr_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_WRITE];
 344     s->stats->rd_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_READ];
 345     s->stats->flush_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_FLUSH];
 346
 347     if (bs->file) {
 348         s->has_parent = true;
 349         s->parent = bdrv_query_stats(bs->file);
 350     }
 351
 352     if (bs->backing_hd) {
 353         s->has_backing = true;
 354         s->backing = bdrv_query_stats(bs->backing_hd);
 355     }
 356
 357     return s;
 358 }
 359
 360 BlockInfoList *qmp_query_block(Error **errp)
 361 {
 362     BlockInfoList *head = NULL, **p_next = &head;
 363     BlockDriverState *bs = NULL;
 364     Error *local_err = NULL;
 365
 366      while ((bs = bdrv_next(bs))) {
 367         BlockInfoList *info = g_malloc0(sizeof(*info));
 368         bdrv_query_info(bs, &info->value, &local_err);
 369         if (local_err) {
 370             error_propagate(errp, local_err);
 371             goto err;
 372         }
 373
 374         *p_next = info;
 375         p_next = &info->next;
 376     }
 377
 378     return head;
 379
 380  err:
 381     qapi_free_BlockInfoList(head);
 382     return NULL;
 383 }
 384
 385 BlockStatsList *qmp_query_blockstats(Error **errp)
 386 {
 387     BlockStatsList *head = NULL, **p_next = &head;
 388     BlockDriverState *bs = NULL;
 389
 390      while ((bs = bdrv_next(bs))) {
 391         BlockStatsList *info = g_malloc0(sizeof(*info));
 392         AioContext *ctx = bdrv_get_aio_context(bs);
 393
 394         aio_context_acquire(ctx);
 395         info->value = bdrv_query_stats(bs);
 396         aio_context_release(ctx);
 397
 398         *p_next = info;
 399         p_next = &info->next;
 400     }
 401
 402     return head;
 403 }
 404
 405 #define NB_SUFFIXES 4
 406
 407 static char *get_human_readable_size(char *buf, int buf_size, int64_t size)
 408 {
 409     static const char suffixes[NB_SUFFIXES] = "KMGT";
 410     int64_t base;
 411     int i;
 412
 413     if (size <= 999) {
 414         snprintf(buf, buf_size, "%" PRId64, size);
 415     } else {
 416         base = 1024;
 417         for (i = 0; i < NB_SUFFIXES; i++) {
 418             if (size < (10 * base)) {
 419                 snprintf(buf, buf_size, "%0.1f%c",
 420                          (double)size / base,
 421                          suffixes[i]);
 422                 break;
 423             } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
 424                 snprintf(buf, buf_size, "%" PRId64 "%c",
 425                          ((size + (base >> 1)) / base),
 426                          suffixes[i]);
 427                 break;
 428             }
 429             base = base * 1024;
 430         }
 431     }
 432     return buf;
 433 }
 434
 435 void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f,
 436                         QEMUSnapshotInfo *sn)
 437 {
 438     char buf1[128], date_buf[128], clock_buf[128];
 439     struct tm tm;
 440     time_t ti;
 441     int64_t secs;
 442
 443     if (!sn) {
 444         func_fprintf(f,
 445                      "%-10s%-20s%7s%20s%15s",
 446                      "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
 447     } else {
 448         ti = sn->date_sec;
 449         localtime_r(&ti, &tm);
 450         strftime(date_buf, sizeof(date_buf),
 451                  "%Y-%m-%d %H:%M:%S", &tm);
 452         secs = sn->vm_clock_nsec / 1000000000;
 453         snprintf(clock_buf, sizeof(clock_buf),
 454                  "%02d:%02d:%02d.%03d",
 455                  (int)(secs / 3600),
 456                  (int)((secs / 60) % 60),
 457                  (int)(secs % 60),
 458                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
 459         func_fprintf(f,
 460                      "%-10s%-20s%7s%20s%15s",
 461                      sn->id_str, sn->name,
 462                      get_human_readable_size(buf1, sizeof(buf1),
 463                                              sn->vm_state_size),
 464                      date_buf,
 465                      clock_buf);
 466     }
 467 }
 468
 469 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 470                        QDict *dict);
 471 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 472                        QList *list);
 473
 474 static void dump_qobject(fprintf_function func_fprintf, void *f,
 475                          int comp_indent, QObject *obj)
 476 {
 477     switch (qobject_type(obj)) {
 478         case QTYPE_QINT: {
 479             QInt *value = qobject_to_qint(obj);
 480             func_fprintf(f, "%" PRId64, qint_get_int(value));
 481             break;
 482         }
 483         case QTYPE_QSTRING: {
 484             QString *value = qobject_to_qstring(obj);
 485             func_fprintf(f, "%s", qstring_get_str(value));
 486             break;
 487         }
 488         case QTYPE_QDICT: {
 489             QDict *value = qobject_to_qdict(obj);
 490             dump_qdict(func_fprintf, f, comp_indent, value);
 491             break;
 492         }
 493         case QTYPE_QLIST: {
 494             QList *value = qobject_to_qlist(obj);
 495             dump_qlist(func_fprintf, f, comp_indent, value);
 496             break;
 497         }
 498         case QTYPE_QFLOAT: {
 499             QFloat *value = qobject_to_qfloat(obj);
 500             func_fprintf(f, "%g", qfloat_get_double(value));
 501             break;
 502         }
 503         case QTYPE_QBOOL: {
 504             QBool *value = qobject_to_qbool(obj);
 505             func_fprintf(f, "%s", qbool_get_int(value) ? "true" : "false");
 506             break;
 507         }
 508         case QTYPE_QERROR: {
 509             QString *value = qerror_human((QError *)obj);
 510             func_fprintf(f, "%s", qstring_get_str(value));
 511             QDECREF(value);
 512             break;
 513         }
 514         case QTYPE_NONE:
 515             break;
 516         case QTYPE_MAX:
 517         default:
 518             abort();
 519     }
 520 }
 521
 522 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 523                        QList *list)
 524 {
 525     const QListEntry *entry;
 526     int i = 0;
 527
 528     for (entry = qlist_first(list); entry; entry = qlist_next(entry), i++) {
 529         qtype_code type = qobject_type(entry->value);
 530         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 531         const char *format = composite ? "%*s[%i]:\n" : "%*s[%i]: ";
 532
 533         func_fprintf(f, format, indentation * 4, "", i);
 534         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 535         if (!composite) {
 536             func_fprintf(f, "\n");
 537         }
 538     }
 539 }
 540
 541 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 542                        QDict *dict)
 543 {
 544     const QDictEntry *entry;
 545
 546     for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
 547         qtype_code type = qobject_type(entry->value);
 548         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 549         const char *format = composite ? "%*s%s:\n" : "%*s%s: ";
 550         char key[strlen(entry->key) + 1];
 551         int i;
 552
 553         /* replace dashes with spaces in key (variable) names */
 554         for (i = 0; entry->key[i]; i++) {
 555             key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];
 556         }
 557         key[i] = 0;
 558
 559         func_fprintf(f, format, indentation * 4, "", key);
 560         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 561         if (!composite) {
 562             func_fprintf(f, "\n");
 563         }
 564     }
 565 }
 566
 567 void bdrv_image_info_specific_dump(fprintf_function func_fprintf, void *f,
 568                                    ImageInfoSpecific *info_spec)
 569 {
 570     QmpOutputVisitor *ov = qmp_output_visitor_new();
 571     QObject *obj, *data;
 572
 573     visit_type_ImageInfoSpecific(qmp_output_get_visitor(ov), &info_spec, NULL,
 574                                  &error_abort);
 575     obj = qmp_output_get_qobject(ov);
 576     assert(qobject_type(obj) == QTYPE_QDICT);
 577     data = qdict_get(qobject_to_qdict(obj), "data");
 578     dump_qobject(func_fprintf, f, 1, data);
 579     qmp_output_visitor_cleanup(ov);
 580 }
 581
 582 void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
 583                           ImageInfo *info)
 584 {
 585     char size_buf[128], dsize_buf[128];
 586     if (!info->has_actual_size) {
 587         snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
 588     } else {
 589         get_human_readable_size(dsize_buf, sizeof(dsize_buf),
 590                                 info->actual_size);
 591     }
 592     get_human_readable_size(size_buf, sizeof(size_buf), info->virtual_size);
 593     func_fprintf(f,
 594                  "image: %s\n"
 595                  "file format: %s\n"
 596                  "virtual size: %s (%" PRId64 " bytes)\n"
 597                  "disk size: %s\n",
 598                  info->filename, info->format, size_buf,
 599                  info->virtual_size,
 600                  dsize_buf);
 601
 602     if (info->has_encrypted && info->encrypted) {
 603         func_fprintf(f, "encrypted: yes\n");
 604     }
 605
 606     if (info->has_cluster_size) {
 607         func_fprintf(f, "cluster_size: %" PRId64 "\n",
 608                        info->cluster_size);
 609     }
 610
 611     if (info->has_dirty_flag && info->dirty_flag) {
 612         func_fprintf(f, "cleanly shut down: no\n");
 613     }
 614
 615     if (info->has_backing_filename) {
 616         func_fprintf(f, "backing file: %s", info->backing_filename);
 617         if (info->has_full_backing_filename) {
 618             func_fprintf(f, " (actual path: %s)", info->full_backing_filename);
 619         }
 620         func_fprintf(f, "\n");
 621         if (info->has_backing_filename_format) {
 622             func_fprintf(f, "backing file format: %s\n",
 623                          info->backing_filename_format);
 624         }
 625     }
 626
 627     if (info->has_snapshots) {
 628         SnapshotInfoList *elem;
 629
 630         func_fprintf(f, "Snapshot list:\n");
 631         bdrv_snapshot_dump(func_fprintf, f, NULL);
 632         func_fprintf(f, "\n");
 633
 634         /* Ideally bdrv_snapshot_dump() would operate on SnapshotInfoList but
 635          * we convert to the block layer's native QEMUSnapshotInfo for now.
 636          */
 637         for (elem = info->snapshots; elem; elem = elem->next) {
 638             QEMUSnapshotInfo sn = {
 639                 .vm_state_size = elem->value->vm_state_size,
 640                 .date_sec = elem->value->date_sec,
 641                 .date_nsec = elem->value->date_nsec,
 642                 .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL +
 643                                  elem->value->vm_clock_nsec,
 644             };
 645
 646             pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id);
 647             pstrcpy(sn.name, sizeof(sn.name), elem->value->name);
 648             bdrv_snapshot_dump(func_fprintf, f, &sn);
 649             func_fprintf(f, "\n");
 650         }
 651     }
 652
 653     if (info->has_format_specific) {
 654         func_fprintf(f, "Format specific information:\n");
 655         bdrv_image_info_specific_dump(func_fprintf, f, info->format_specific);
 656     }
 657
 658     if (info->has_nocow && info->nocow) {
 659         func_fprintf(f, "NOCOW flag: set\n");
 660     }
 661 }