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 #ifdef __linux__
  33 #include <linux/fs.h>
  34 #include <sys/ioctl.h>
  35 #ifndef FS_NOCOW_FL
  36 #define FS_NOCOW_FL                     0x00800000 /* Do not cow file */
  37 #endif
  38 #endif
  39
  40 BlockDeviceInfo *bdrv_block_device_info(BlockDriverState *bs)
  41 {
  42     BlockDeviceInfo *info = g_malloc0(sizeof(*info));
  43
  44     info->file                   = g_strdup(bs->filename);
  45     info->ro                     = bs->read_only;
  46     info->drv                    = g_strdup(bs->drv->format_name);
  47     info->encrypted              = bs->encrypted;
  48     info->encryption_key_missing = bdrv_key_required(bs);
  49
  50     if (bs->node_name[0]) {
  51         info->has_node_name = true;
  52         info->node_name = g_strdup(bs->node_name);
  53     }
  54
  55     if (bs->backing_file[0]) {
  56         info->has_backing_file = true;
  57         info->backing_file = g_strdup(bs->backing_file);
  58     }
  59
  60     info->backing_file_depth = bdrv_get_backing_file_depth(bs);
  61     info->detect_zeroes = bs->detect_zeroes;
  62
  63     if (bs->io_limits_enabled) {
  64         ThrottleConfig cfg;
  65         throttle_get_config(&bs->throttle_state, &cfg);
  66         info->bps     = cfg.buckets[THROTTLE_BPS_TOTAL].avg;
  67         info->bps_rd  = cfg.buckets[THROTTLE_BPS_READ].avg;
  68         info->bps_wr  = cfg.buckets[THROTTLE_BPS_WRITE].avg;
  69
  70         info->iops    = cfg.buckets[THROTTLE_OPS_TOTAL].avg;
  71         info->iops_rd = cfg.buckets[THROTTLE_OPS_READ].avg;
  72         info->iops_wr = cfg.buckets[THROTTLE_OPS_WRITE].avg;
  73
  74         info->has_bps_max     = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  75         info->bps_max         = cfg.buckets[THROTTLE_BPS_TOTAL].max;
  76         info->has_bps_rd_max  = cfg.buckets[THROTTLE_BPS_READ].max;
  77         info->bps_rd_max      = cfg.buckets[THROTTLE_BPS_READ].max;
  78         info->has_bps_wr_max  = cfg.buckets[THROTTLE_BPS_WRITE].max;
  79         info->bps_wr_max      = cfg.buckets[THROTTLE_BPS_WRITE].max;
  80
  81         info->has_iops_max    = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  82         info->iops_max        = cfg.buckets[THROTTLE_OPS_TOTAL].max;
  83         info->has_iops_rd_max = cfg.buckets[THROTTLE_OPS_READ].max;
  84         info->iops_rd_max     = cfg.buckets[THROTTLE_OPS_READ].max;
  85         info->has_iops_wr_max = cfg.buckets[THROTTLE_OPS_WRITE].max;
  86         info->iops_wr_max     = cfg.buckets[THROTTLE_OPS_WRITE].max;
  87
  88         info->has_iops_size = cfg.op_size;
  89         info->iops_size = cfg.op_size;
  90     }
  91
  92     return info;
  93 }
  94
  95 /*
  96  * Returns 0 on success, with *p_list either set to describe snapshot
  97  * information, or NULL because there are no snapshots.  Returns -errno on
  98  * error, with *p_list untouched.
  99  */
 100 int bdrv_query_snapshot_info_list(BlockDriverState *bs,
 101                                   SnapshotInfoList **p_list,
 102                                   Error **errp)
 103 {
 104     int i, sn_count;
 105     QEMUSnapshotInfo *sn_tab = NULL;
 106     SnapshotInfoList *info_list, *cur_item = NULL, *head = NULL;
 107     SnapshotInfo *info;
 108
 109     sn_count = bdrv_snapshot_list(bs, &sn_tab);
 110     if (sn_count < 0) {
 111         const char *dev = bdrv_get_device_name(bs);
 112         switch (sn_count) {
 113         case -ENOMEDIUM:
 114             error_setg(errp, "Device '%s' is not inserted", dev);
 115             break;
 116         case -ENOTSUP:
 117             error_setg(errp,
 118                        "Device '%s' does not support internal snapshots",
 119                        dev);
 120             break;
 121         default:
 122             error_setg_errno(errp, -sn_count,
 123                              "Can't list snapshots of device '%s'", dev);
 124             break;
 125         }
 126         return sn_count;
 127     }
 128
 129     for (i = 0; i < sn_count; i++) {
 130         info = g_new0(SnapshotInfo, 1);
 131         info->id            = g_strdup(sn_tab[i].id_str);
 132         info->name          = g_strdup(sn_tab[i].name);
 133         info->vm_state_size = sn_tab[i].vm_state_size;
 134         info->date_sec      = sn_tab[i].date_sec;
 135         info->date_nsec     = sn_tab[i].date_nsec;
 136         info->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
 137         info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
 138
 139         info_list = g_new0(SnapshotInfoList, 1);
 140         info_list->value = info;
 141
 142         /* XXX: waiting for the qapi to support qemu-queue.h types */
 143         if (!cur_item) {
 144             head = cur_item = info_list;
 145         } else {
 146             cur_item->next = info_list;
 147             cur_item = info_list;
 148         }
 149
 150     }
 151
 152     g_free(sn_tab);
 153     *p_list = head;
 154     return 0;
 155 }
 156
 157 /**
 158  * bdrv_query_image_info:
 159  * @bs: block device to examine
 160  * @p_info: location to store image information
 161  * @errp: location to store error information
 162  *
 163  * Store "flat" image information in @p_info.
 164  *
 165  * "Flat" means it does *not* query backing image information,
 166  * i.e. (*pinfo)->has_backing_image will be set to false and
 167  * (*pinfo)->backing_image to NULL even when the image does in fact have
 168  * a backing image.
 169  *
 170  * @p_info will be set only on success. On error, store error in @errp.
 171  */
 172 void bdrv_query_image_info(BlockDriverState *bs,
 173                            ImageInfo **p_info,
 174                            Error **errp)
 175 {
 176     int64_t size;
 177     const char *backing_filename;
 178     char backing_filename2[1024];
 179     BlockDriverInfo bdi;
 180     int ret;
 181     Error *err = NULL;
 182     ImageInfo *info;
 183 #ifdef __linux__
 184     int fd, attr;
 185 #endif
 186
 187     size = bdrv_getlength(bs);
 188     if (size < 0) {
 189         error_setg_errno(errp, -size, "Can't get size of device '%s'",
 190                          bdrv_get_device_name(bs));
 191         return;
 192     }
 193
 194     info = g_new0(ImageInfo, 1);
 195     info->filename        = g_strdup(bs->filename);
 196     info->format          = g_strdup(bdrv_get_format_name(bs));
 197     info->virtual_size    = size;
 198     info->actual_size     = bdrv_get_allocated_file_size(bs);
 199     info->has_actual_size = info->actual_size >= 0;
 200     if (bdrv_is_encrypted(bs)) {
 201         info->encrypted = true;
 202         info->has_encrypted = true;
 203     }
 204     if (bdrv_get_info(bs, &bdi) >= 0) {
 205         if (bdi.cluster_size != 0) {
 206             info->cluster_size = bdi.cluster_size;
 207             info->has_cluster_size = true;
 208         }
 209         info->dirty_flag = bdi.is_dirty;
 210         info->has_dirty_flag = true;
 211     }
 212     info->format_specific     = bdrv_get_specific_info(bs);
 213     info->has_format_specific = info->format_specific != NULL;
 214
 215 #ifdef __linux__
 216     /* get NOCOW info */
 217     fd = qemu_open(bs->filename, O_RDONLY | O_NONBLOCK);
 218     if (fd >= 0) {
 219         if (ioctl(fd, FS_IOC_GETFLAGS, &attr) == 0 && (attr & FS_NOCOW_FL)) {
 220             info->has_nocow = true;
 221             info->nocow = true;
 222         }
 223         qemu_close(fd);
 224     }
 225 #endif
 226
 227     backing_filename = bs->backing_file;
 228     if (backing_filename[0] != '\0') {
 229         info->backing_filename = g_strdup(backing_filename);
 230         info->has_backing_filename = true;
 231         bdrv_get_full_backing_filename(bs, backing_filename2,
 232                                        sizeof(backing_filename2));
 233
 234         if (strcmp(backing_filename, backing_filename2) != 0) {
 235             info->full_backing_filename =
 236                         g_strdup(backing_filename2);
 237             info->has_full_backing_filename = true;
 238         }
 239
 240         if (bs->backing_format[0]) {
 241             info->backing_filename_format = g_strdup(bs->backing_format);
 242             info->has_backing_filename_format = true;
 243         }
 244     }
 245
 246     ret = bdrv_query_snapshot_info_list(bs, &info->snapshots, &err);
 247     switch (ret) {
 248     case 0:
 249         if (info->snapshots) {
 250             info->has_snapshots = true;
 251         }
 252         break;
 253     /* recoverable error */
 254     case -ENOMEDIUM:
 255     case -ENOTSUP:
 256         error_free(err);
 257         break;
 258     default:
 259         error_propagate(errp, err);
 260         qapi_free_ImageInfo(info);
 261         return;
 262     }
 263
 264     *p_info = info;
 265 }
 266
 267 /* @p_info will be set only on success. */
 268 static void bdrv_query_info(BlockBackend *blk, BlockInfo **p_info,
 269                             Error **errp)
 270 {
 271     BlockInfo *info = g_malloc0(sizeof(*info));
 272     BlockDriverState *bs = blk_bs(blk);
 273     BlockDriverState *bs0;
 274     ImageInfo **p_image_info;
 275     Error *local_err = NULL;
 276     info->device = g_strdup(blk_name(blk));
 277     info->type = g_strdup("unknown");
 278     info->locked = blk_dev_is_medium_locked(blk);
 279     info->removable = blk_dev_has_removable_media(blk);
 280
 281     if (blk_dev_has_removable_media(blk)) {
 282         info->has_tray_open = true;
 283         info->tray_open = blk_dev_is_tray_open(blk);
 284     }
 285
 286     if (bdrv_iostatus_is_enabled(bs)) {
 287         info->has_io_status = true;
 288         info->io_status = bs->iostatus;
 289     }
 290
 291     if (!QLIST_EMPTY(&bs->dirty_bitmaps)) {
 292         info->has_dirty_bitmaps = true;
 293         info->dirty_bitmaps = bdrv_query_dirty_bitmaps(bs);
 294     }
 295
 296     if (bs->drv) {
 297         info->has_inserted = true;
 298         info->inserted = bdrv_block_device_info(bs);
 299
 300         bs0 = bs;
 301         p_image_info = &info->inserted->image;
 302         while (1) {
 303             bdrv_query_image_info(bs0, p_image_info, &local_err);
 304             if (local_err) {
 305                 error_propagate(errp, local_err);
 306                 goto err;
 307             }
 308             if (bs0->drv && bs0->backing_hd) {
 309                 bs0 = bs0->backing_hd;
 310                 (*p_image_info)->has_backing_image = true;
 311                 p_image_info = &((*p_image_info)->backing_image);
 312             } else {
 313                 break;
 314             }
 315         }
 316     }
 317
 318     *p_info = info;
 319     return;
 320
 321  err:
 322     qapi_free_BlockInfo(info);
 323 }
 324
 325 static BlockStats *bdrv_query_stats(const BlockDriverState *bs)
 326 {
 327     BlockStats *s;
 328
 329     s = g_malloc0(sizeof(*s));
 330
 331     if (bdrv_get_device_name(bs)[0]) {
 332         s->has_device = true;
 333         s->device = g_strdup(bdrv_get_device_name(bs));
 334     }
 335
 336     s->stats = g_malloc0(sizeof(*s->stats));
 337     s->stats->rd_bytes = bs->stats.nr_bytes[BLOCK_ACCT_READ];
 338     s->stats->wr_bytes = bs->stats.nr_bytes[BLOCK_ACCT_WRITE];
 339     s->stats->rd_operations = bs->stats.nr_ops[BLOCK_ACCT_READ];
 340     s->stats->wr_operations = bs->stats.nr_ops[BLOCK_ACCT_WRITE];
 341     s->stats->wr_highest_offset =
 342         bs->stats.wr_highest_sector * BDRV_SECTOR_SIZE;
 343     s->stats->flush_operations = bs->stats.nr_ops[BLOCK_ACCT_FLUSH];
 344     s->stats->wr_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_WRITE];
 345     s->stats->rd_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_READ];
 346     s->stats->flush_total_time_ns = bs->stats.total_time_ns[BLOCK_ACCT_FLUSH];
 347
 348     if (bs->file) {
 349         s->has_parent = true;
 350         s->parent = bdrv_query_stats(bs->file);
 351     }
 352
 353     if (bs->backing_hd) {
 354         s->has_backing = true;
 355         s->backing = bdrv_query_stats(bs->backing_hd);
 356     }
 357
 358     return s;
 359 }
 360
 361 BlockInfoList *qmp_query_block(Error **errp)
 362 {
 363     BlockInfoList *head = NULL, **p_next = &head;
 364     BlockBackend *blk;
 365     Error *local_err = NULL;
 366
 367     for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
 368         BlockInfoList *info = g_malloc0(sizeof(*info));
 369         bdrv_query_info(blk, &info->value, &local_err);
 370         if (local_err) {
 371             error_propagate(errp, local_err);
 372             goto err;
 373         }
 374
 375         *p_next = info;
 376         p_next = &info->next;
 377     }
 378
 379     return head;
 380
 381  err:
 382     qapi_free_BlockInfoList(head);
 383     return NULL;
 384 }
 385
 386 BlockStatsList *qmp_query_blockstats(Error **errp)
 387 {
 388     BlockStatsList *head = NULL, **p_next = &head;
 389     BlockDriverState *bs = NULL;
 390
 391      while ((bs = bdrv_next(bs))) {
 392         BlockStatsList *info = g_malloc0(sizeof(*info));
 393         AioContext *ctx = bdrv_get_aio_context(bs);
 394
 395         aio_context_acquire(ctx);
 396         info->value = bdrv_query_stats(bs);
 397         aio_context_release(ctx);
 398
 399         *p_next = info;
 400         p_next = &info->next;
 401     }
 402
 403     return head;
 404 }
 405
 406 #define NB_SUFFIXES 4
 407
 408 static char *get_human_readable_size(char *buf, int buf_size, int64_t size)
 409 {
 410     static const char suffixes[NB_SUFFIXES] = "KMGT";
 411     int64_t base;
 412     int i;
 413
 414     if (size <= 999) {
 415         snprintf(buf, buf_size, "%" PRId64, size);
 416     } else {
 417         base = 1024;
 418         for (i = 0; i < NB_SUFFIXES; i++) {
 419             if (size < (10 * base)) {
 420                 snprintf(buf, buf_size, "%0.1f%c",
 421                          (double)size / base,
 422                          suffixes[i]);
 423                 break;
 424             } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
 425                 snprintf(buf, buf_size, "%" PRId64 "%c",
 426                          ((size + (base >> 1)) / base),
 427                          suffixes[i]);
 428                 break;
 429             }
 430             base = base * 1024;
 431         }
 432     }
 433     return buf;
 434 }
 435
 436 void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f,
 437                         QEMUSnapshotInfo *sn)
 438 {
 439     char buf1[128], date_buf[128], clock_buf[128];
 440     struct tm tm;
 441     time_t ti;
 442     int64_t secs;
 443
 444     if (!sn) {
 445         func_fprintf(f,
 446                      "%-10s%-20s%7s%20s%15s",
 447                      "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
 448     } else {
 449         ti = sn->date_sec;
 450         localtime_r(&ti, &tm);
 451         strftime(date_buf, sizeof(date_buf),
 452                  "%Y-%m-%d %H:%M:%S", &tm);
 453         secs = sn->vm_clock_nsec / 1000000000;
 454         snprintf(clock_buf, sizeof(clock_buf),
 455                  "%02d:%02d:%02d.%03d",
 456                  (int)(secs / 3600),
 457                  (int)((secs / 60) % 60),
 458                  (int)(secs % 60),
 459                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
 460         func_fprintf(f,
 461                      "%-10s%-20s%7s%20s%15s",
 462                      sn->id_str, sn->name,
 463                      get_human_readable_size(buf1, sizeof(buf1),
 464                                              sn->vm_state_size),
 465                      date_buf,
 466                      clock_buf);
 467     }
 468 }
 469
 470 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 471                        QDict *dict);
 472 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 473                        QList *list);
 474
 475 static void dump_qobject(fprintf_function func_fprintf, void *f,
 476                          int comp_indent, QObject *obj)
 477 {
 478     switch (qobject_type(obj)) {
 479         case QTYPE_QINT: {
 480             QInt *value = qobject_to_qint(obj);
 481             func_fprintf(f, "%" PRId64, qint_get_int(value));
 482             break;
 483         }
 484         case QTYPE_QSTRING: {
 485             QString *value = qobject_to_qstring(obj);
 486             func_fprintf(f, "%s", qstring_get_str(value));
 487             break;
 488         }
 489         case QTYPE_QDICT: {
 490             QDict *value = qobject_to_qdict(obj);
 491             dump_qdict(func_fprintf, f, comp_indent, value);
 492             break;
 493         }
 494         case QTYPE_QLIST: {
 495             QList *value = qobject_to_qlist(obj);
 496             dump_qlist(func_fprintf, f, comp_indent, value);
 497             break;
 498         }
 499         case QTYPE_QFLOAT: {
 500             QFloat *value = qobject_to_qfloat(obj);
 501             func_fprintf(f, "%g", qfloat_get_double(value));
 502             break;
 503         }
 504         case QTYPE_QBOOL: {
 505             QBool *value = qobject_to_qbool(obj);
 506             func_fprintf(f, "%s", qbool_get_int(value) ? "true" : "false");
 507             break;
 508         }
 509         case QTYPE_QERROR: {
 510             QString *value = qerror_human((QError *)obj);
 511             func_fprintf(f, "%s", qstring_get_str(value));
 512             QDECREF(value);
 513             break;
 514         }
 515         case QTYPE_NONE:
 516             break;
 517         case QTYPE_MAX:
 518         default:
 519             abort();
 520     }
 521 }
 522
 523 static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation,
 524                        QList *list)
 525 {
 526     const QListEntry *entry;
 527     int i = 0;
 528
 529     for (entry = qlist_first(list); entry; entry = qlist_next(entry), i++) {
 530         qtype_code type = qobject_type(entry->value);
 531         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 532         const char *format = composite ? "%*s[%i]:\n" : "%*s[%i]: ";
 533
 534         func_fprintf(f, format, indentation * 4, "", i);
 535         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 536         if (!composite) {
 537             func_fprintf(f, "\n");
 538         }
 539     }
 540 }
 541
 542 static void dump_qdict(fprintf_function func_fprintf, void *f, int indentation,
 543                        QDict *dict)
 544 {
 545     const QDictEntry *entry;
 546
 547     for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
 548         qtype_code type = qobject_type(entry->value);
 549         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 550         const char *format = composite ? "%*s%s:\n" : "%*s%s: ";
 551         char key[strlen(entry->key) + 1];
 552         int i;
 553
 554         /* replace dashes with spaces in key (variable) names */
 555         for (i = 0; entry->key[i]; i++) {
 556             key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];
 557         }
 558         key[i] = 0;
 559
 560         func_fprintf(f, format, indentation * 4, "", key);
 561         dump_qobject(func_fprintf, f, indentation + 1, entry->value);
 562         if (!composite) {
 563             func_fprintf(f, "\n");
 564         }
 565     }
 566 }
 567
 568 void bdrv_image_info_specific_dump(fprintf_function func_fprintf, void *f,
 569                                    ImageInfoSpecific *info_spec)
 570 {
 571     QmpOutputVisitor *ov = qmp_output_visitor_new();
 572     QObject *obj, *data;
 573
 574     visit_type_ImageInfoSpecific(qmp_output_get_visitor(ov), &info_spec, NULL,
 575                                  &error_abort);
 576     obj = qmp_output_get_qobject(ov);
 577     assert(qobject_type(obj) == QTYPE_QDICT);
 578     data = qdict_get(qobject_to_qdict(obj), "data");
 579     dump_qobject(func_fprintf, f, 1, data);
 580     qmp_output_visitor_cleanup(ov);
 581 }
 582
 583 void bdrv_image_info_dump(fprintf_function func_fprintf, void *f,
 584                           ImageInfo *info)
 585 {
 586     char size_buf[128], dsize_buf[128];
 587     if (!info->has_actual_size) {
 588         snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
 589     } else {
 590         get_human_readable_size(dsize_buf, sizeof(dsize_buf),
 591                                 info->actual_size);
 592     }
 593     get_human_readable_size(size_buf, sizeof(size_buf), info->virtual_size);
 594     func_fprintf(f,
 595                  "image: %s\n"
 596                  "file format: %s\n"
 597                  "virtual size: %s (%" PRId64 " bytes)\n"
 598                  "disk size: %s\n",
 599                  info->filename, info->format, size_buf,
 600                  info->virtual_size,
 601                  dsize_buf);
 602
 603     if (info->has_encrypted && info->encrypted) {
 604         func_fprintf(f, "encrypted: yes\n");
 605     }
 606
 607     if (info->has_cluster_size) {
 608         func_fprintf(f, "cluster_size: %" PRId64 "\n",
 609                        info->cluster_size);
 610     }
 611
 612     if (info->has_dirty_flag && info->dirty_flag) {
 613         func_fprintf(f, "cleanly shut down: no\n");
 614     }
 615
 616     if (info->has_backing_filename) {
 617         func_fprintf(f, "backing file: %s", info->backing_filename);
 618         if (info->has_full_backing_filename) {
 619             func_fprintf(f, " (actual path: %s)", info->full_backing_filename);
 620         }
 621         func_fprintf(f, "\n");
 622         if (info->has_backing_filename_format) {
 623             func_fprintf(f, "backing file format: %s\n",
 624                          info->backing_filename_format);
 625         }
 626     }
 627
 628     if (info->has_snapshots) {
 629         SnapshotInfoList *elem;
 630
 631         func_fprintf(f, "Snapshot list:\n");
 632         bdrv_snapshot_dump(func_fprintf, f, NULL);
 633         func_fprintf(f, "\n");
 634
 635         /* Ideally bdrv_snapshot_dump() would operate on SnapshotInfoList but
 636          * we convert to the block layer's native QEMUSnapshotInfo for now.
 637          */
 638         for (elem = info->snapshots; elem; elem = elem->next) {
 639             QEMUSnapshotInfo sn = {
 640                 .vm_state_size = elem->value->vm_state_size,
 641                 .date_sec = elem->value->date_sec,
 642                 .date_nsec = elem->value->date_nsec,
 643                 .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL +
 644                                  elem->value->vm_clock_nsec,
 645             };
 646
 647             pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id);
 648             pstrcpy(sn.name, sizeof(sn.name), elem->value->name);
 649             bdrv_snapshot_dump(func_fprintf, f, &sn);
 650             func_fprintf(f, "\n");
 651         }
 652     }
 653
 654     if (info->has_format_specific) {
 655         func_fprintf(f, "Format specific information:\n");
 656         bdrv_image_info_specific_dump(func_fprintf, f, info->format_specific);
 657     }
 658
 659     if (info->has_nocow && info->nocow) {
 660         func_fprintf(f, "NOCOW flag: set\n");
 661     }
 662 }