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 "qemu/osdep.h"
  26 #include "qemu/cutils.h"
  27 #include "block/qapi.h"
  28 #include "block/block_int.h"
  29 #include "block/dirty-bitmap.h"
  30 #include "block/throttle-groups.h"
  31 #include "block/write-threshold.h"
  32 #include "qapi/error.h"
  33 #include "qapi/qapi-commands-block-core.h"
  34 #include "qapi/qobject-output-visitor.h"
  35 #include "qapi/qapi-visit-block-core.h"
  36 #include "qapi/qmp/qbool.h"
  37 #include "qapi/qmp/qdict.h"
  38 #include "qapi/qmp/qlist.h"
  39 #include "qapi/qmp/qnum.h"
  40 #include "qapi/qmp/qstring.h"
  41 #include "qemu/qemu-print.h"
  42 #include "sysemu/block-backend.h"
  43 #include "qemu/cutils.h"
  44
  45 BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
  46                                         BlockDriverState *bs,
  47                                         bool flat,
  48                                         Error **errp)
  49 {
  50     ImageInfo **p_image_info;
  51     BlockDriverState *bs0, *backing;
  52     BlockDeviceInfo *info;
  53
  54     if (!bs->drv) {
  55         error_setg(errp, "Block device %s is ejected", bs->node_name);
  56         return NULL;
  57     }
  58
  59     bdrv_refresh_filename(bs);
  60
  61     info = g_malloc0(sizeof(*info));
  62     info->file                   = g_strdup(bs->filename);
  63     info->ro                     = bdrv_is_read_only(bs);
  64     info->drv                    = g_strdup(bs->drv->format_name);
  65     info->encrypted              = bs->encrypted;
  66
  67     info->cache = g_new(BlockdevCacheInfo, 1);
  68     *info->cache = (BlockdevCacheInfo) {
  69         .writeback      = blk ? blk_enable_write_cache(blk) : true,
  70         .direct         = !!(bs->open_flags & BDRV_O_NOCACHE),
  71         .no_flush       = !!(bs->open_flags & BDRV_O_NO_FLUSH),
  72     };
  73
  74     if (bs->node_name[0]) {
  75         info->node_name = g_strdup(bs->node_name);
  76     }
  77
  78     backing = bdrv_cow_bs(bs);
  79     if (backing) {
  80         info->backing_file = g_strdup(backing->filename);
  81     }
  82
  83     if (!QLIST_EMPTY(&bs->dirty_bitmaps)) {
  84         info->has_dirty_bitmaps = true;
  85         info->dirty_bitmaps = bdrv_query_dirty_bitmaps(bs);
  86     }
  87
  88     info->detect_zeroes = bs->detect_zeroes;
  89
  90     if (blk && blk_get_public(blk)->throttle_group_member.throttle_state) {
  91         ThrottleConfig cfg;
  92         BlockBackendPublic *blkp = blk_get_public(blk);
  93
  94         throttle_group_get_config(&blkp->throttle_group_member, &cfg);
  95
  96         info->bps     = cfg.buckets[THROTTLE_BPS_TOTAL].avg;
  97         info->bps_rd  = cfg.buckets[THROTTLE_BPS_READ].avg;
  98         info->bps_wr  = cfg.buckets[THROTTLE_BPS_WRITE].avg;
  99
 100         info->iops    = cfg.buckets[THROTTLE_OPS_TOTAL].avg;
 101         info->iops_rd = cfg.buckets[THROTTLE_OPS_READ].avg;
 102         info->iops_wr = cfg.buckets[THROTTLE_OPS_WRITE].avg;
 103
 104         info->has_bps_max     = cfg.buckets[THROTTLE_BPS_TOTAL].max;
 105         info->bps_max         = cfg.buckets[THROTTLE_BPS_TOTAL].max;
 106         info->has_bps_rd_max  = cfg.buckets[THROTTLE_BPS_READ].max;
 107         info->bps_rd_max      = cfg.buckets[THROTTLE_BPS_READ].max;
 108         info->has_bps_wr_max  = cfg.buckets[THROTTLE_BPS_WRITE].max;
 109         info->bps_wr_max      = cfg.buckets[THROTTLE_BPS_WRITE].max;
 110
 111         info->has_iops_max    = cfg.buckets[THROTTLE_OPS_TOTAL].max;
 112         info->iops_max        = cfg.buckets[THROTTLE_OPS_TOTAL].max;
 113         info->has_iops_rd_max = cfg.buckets[THROTTLE_OPS_READ].max;
 114         info->iops_rd_max     = cfg.buckets[THROTTLE_OPS_READ].max;
 115         info->has_iops_wr_max = cfg.buckets[THROTTLE_OPS_WRITE].max;
 116         info->iops_wr_max     = cfg.buckets[THROTTLE_OPS_WRITE].max;
 117
 118         info->has_bps_max_length     = info->has_bps_max;
 119         info->bps_max_length         =
 120             cfg.buckets[THROTTLE_BPS_TOTAL].burst_length;
 121         info->has_bps_rd_max_length  = info->has_bps_rd_max;
 122         info->bps_rd_max_length      =
 123             cfg.buckets[THROTTLE_BPS_READ].burst_length;
 124         info->has_bps_wr_max_length  = info->has_bps_wr_max;
 125         info->bps_wr_max_length      =
 126             cfg.buckets[THROTTLE_BPS_WRITE].burst_length;
 127
 128         info->has_iops_max_length    = info->has_iops_max;
 129         info->iops_max_length        =
 130             cfg.buckets[THROTTLE_OPS_TOTAL].burst_length;
 131         info->has_iops_rd_max_length = info->has_iops_rd_max;
 132         info->iops_rd_max_length     =
 133             cfg.buckets[THROTTLE_OPS_READ].burst_length;
 134         info->has_iops_wr_max_length = info->has_iops_wr_max;
 135         info->iops_wr_max_length     =
 136             cfg.buckets[THROTTLE_OPS_WRITE].burst_length;
 137
 138         info->has_iops_size = cfg.op_size;
 139         info->iops_size = cfg.op_size;
 140
 141         info->group =
 142             g_strdup(throttle_group_get_name(&blkp->throttle_group_member));
 143     }
 144
 145     info->write_threshold = bdrv_write_threshold_get(bs);
 146
 147     bs0 = bs;
 148     p_image_info = &info->image;
 149     info->backing_file_depth = 0;
 150     while (1) {
 151         Error *local_err = NULL;
 152         bdrv_query_image_info(bs0, p_image_info, &local_err);
 153         if (local_err) {
 154             error_propagate(errp, local_err);
 155             qapi_free_BlockDeviceInfo(info);
 156             return NULL;
 157         }
 158
 159         /* stop gathering data for flat output */
 160         if (flat) {
 161             break;
 162         }
 163
 164         if (bs0->drv && bdrv_filter_or_cow_child(bs0)) {
 165             /*
 166              * Put any filtered child here (for backwards compatibility to when
 167              * we put bs0->backing here, which might be any filtered child).
 168              */
 169             info->backing_file_depth++;
 170             bs0 = bdrv_filter_or_cow_bs(bs0);
 171             p_image_info = &((*p_image_info)->backing_image);
 172         } else {
 173             break;
 174         }
 175
 176         /* Skip automatically inserted nodes that the user isn't aware of for
 177          * query-block (blk != NULL), but not for query-named-block-nodes */
 178         if (blk) {
 179             bs0 = bdrv_skip_implicit_filters(bs0);
 180         }
 181     }
 182
 183     return info;
 184 }
 185
 186 /*
 187  * Returns 0 on success, with *p_list either set to describe snapshot
 188  * information, or NULL because there are no snapshots.  Returns -errno on
 189  * error, with *p_list untouched.
 190  */
 191 int bdrv_query_snapshot_info_list(BlockDriverState *bs,
 192                                   SnapshotInfoList **p_list,
 193                                   Error **errp)
 194 {
 195     int i, sn_count;
 196     QEMUSnapshotInfo *sn_tab = NULL;
 197     SnapshotInfoList *head = NULL, **tail = &head;
 198     SnapshotInfo *info;
 199
 200     sn_count = bdrv_snapshot_list(bs, &sn_tab);
 201     if (sn_count < 0) {
 202         const char *dev = bdrv_get_device_name(bs);
 203         switch (sn_count) {
 204         case -ENOMEDIUM:
 205             error_setg(errp, "Device '%s' is not inserted", dev);
 206             break;
 207         case -ENOTSUP:
 208             error_setg(errp,
 209                        "Device '%s' does not support internal snapshots",
 210                        dev);
 211             break;
 212         default:
 213             error_setg_errno(errp, -sn_count,
 214                              "Can't list snapshots of device '%s'", dev);
 215             break;
 216         }
 217         return sn_count;
 218     }
 219
 220     for (i = 0; i < sn_count; i++) {
 221         info = g_new0(SnapshotInfo, 1);
 222         info->id            = g_strdup(sn_tab[i].id_str);
 223         info->name          = g_strdup(sn_tab[i].name);
 224         info->vm_state_size = sn_tab[i].vm_state_size;
 225         info->date_sec      = sn_tab[i].date_sec;
 226         info->date_nsec     = sn_tab[i].date_nsec;
 227         info->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
 228         info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
 229         info->icount        = sn_tab[i].icount;
 230         info->has_icount    = sn_tab[i].icount != -1ULL;
 231
 232         QAPI_LIST_APPEND(tail, info);
 233     }
 234
 235     g_free(sn_tab);
 236     *p_list = head;
 237     return 0;
 238 }
 239
 240 /**
 241  * bdrv_query_image_info:
 242  * @bs: block device to examine
 243  * @p_info: location to store image information
 244  * @errp: location to store error information
 245  *
 246  * Store "flat" image information in @p_info.
 247  *
 248  * "Flat" means it does *not* query backing image information,
 249  * i.e. (*pinfo)->has_backing_image will be set to false and
 250  * (*pinfo)->backing_image to NULL even when the image does in fact have
 251  * a backing image.
 252  *
 253  * @p_info will be set only on success. On error, store error in @errp.
 254  */
 255 void bdrv_query_image_info(BlockDriverState *bs,
 256                            ImageInfo **p_info,
 257                            Error **errp)
 258 {
 259     int64_t size;
 260     const char *backing_filename;
 261     BlockDriverInfo bdi;
 262     int ret;
 263     Error *err = NULL;
 264     ImageInfo *info;
 265
 266     aio_context_acquire(bdrv_get_aio_context(bs));
 267
 268     size = bdrv_getlength(bs);
 269     if (size < 0) {
 270         error_setg_errno(errp, -size, "Can't get image size '%s'",
 271                          bs->exact_filename);
 272         goto out;
 273     }
 274
 275     bdrv_refresh_filename(bs);
 276
 277     info = g_new0(ImageInfo, 1);
 278     info->filename        = g_strdup(bs->filename);
 279     info->format          = g_strdup(bdrv_get_format_name(bs));
 280     info->virtual_size    = size;
 281     info->actual_size     = bdrv_get_allocated_file_size(bs);
 282     info->has_actual_size = info->actual_size >= 0;
 283     if (bs->encrypted) {
 284         info->encrypted = true;
 285         info->has_encrypted = true;
 286     }
 287     if (bdrv_get_info(bs, &bdi) >= 0) {
 288         if (bdi.cluster_size != 0) {
 289             info->cluster_size = bdi.cluster_size;
 290             info->has_cluster_size = true;
 291         }
 292         info->dirty_flag = bdi.is_dirty;
 293         info->has_dirty_flag = true;
 294     }
 295     info->format_specific = bdrv_get_specific_info(bs, &err);
 296     if (err) {
 297         error_propagate(errp, err);
 298         qapi_free_ImageInfo(info);
 299         goto out;
 300     }
 301     backing_filename = bs->backing_file;
 302     if (backing_filename[0] != '\0') {
 303         char *backing_filename2;
 304
 305         info->backing_filename = g_strdup(backing_filename);
 306         backing_filename2 = bdrv_get_full_backing_filename(bs, NULL);
 307
 308         /* Always report the full_backing_filename if present, even if it's the
 309          * same as backing_filename. That they are same is useful info. */
 310         if (backing_filename2) {
 311             info->full_backing_filename = g_strdup(backing_filename2);
 312         }
 313
 314         if (bs->backing_format[0]) {
 315             info->backing_filename_format = g_strdup(bs->backing_format);
 316         }
 317         g_free(backing_filename2);
 318     }
 319
 320     ret = bdrv_query_snapshot_info_list(bs, &info->snapshots, &err);
 321     switch (ret) {
 322     case 0:
 323         if (info->snapshots) {
 324             info->has_snapshots = true;
 325         }
 326         break;
 327     /* recoverable error */
 328     case -ENOMEDIUM:
 329     case -ENOTSUP:
 330         error_free(err);
 331         break;
 332     default:
 333         error_propagate(errp, err);
 334         qapi_free_ImageInfo(info);
 335         goto out;
 336     }
 337
 338     *p_info = info;
 339
 340 out:
 341     aio_context_release(bdrv_get_aio_context(bs));
 342 }
 343
 344 /* @p_info will be set only on success. */
 345 static void bdrv_query_info(BlockBackend *blk, BlockInfo **p_info,
 346                             Error **errp)
 347 {
 348     BlockInfo *info = g_malloc0(sizeof(*info));
 349     BlockDriverState *bs = blk_bs(blk);
 350     char *qdev;
 351
 352     /* Skip automatically inserted nodes that the user isn't aware of */
 353     bs = bdrv_skip_implicit_filters(bs);
 354
 355     info->device = g_strdup(blk_name(blk));
 356     info->type = g_strdup("unknown");
 357     info->locked = blk_dev_is_medium_locked(blk);
 358     info->removable = blk_dev_has_removable_media(blk);
 359
 360     qdev = blk_get_attached_dev_id(blk);
 361     if (qdev && *qdev) {
 362         info->qdev = qdev;
 363     } else {
 364         g_free(qdev);
 365     }
 366
 367     if (blk_dev_has_tray(blk)) {
 368         info->has_tray_open = true;
 369         info->tray_open = blk_dev_is_tray_open(blk);
 370     }
 371
 372     if (blk_iostatus_is_enabled(blk)) {
 373         info->has_io_status = true;
 374         info->io_status = blk_iostatus(blk);
 375     }
 376
 377     if (bs && bs->drv) {
 378         info->inserted = bdrv_block_device_info(blk, bs, false, errp);
 379         if (info->inserted == NULL) {
 380             goto err;
 381         }
 382     }
 383
 384     *p_info = info;
 385     return;
 386
 387  err:
 388     qapi_free_BlockInfo(info);
 389 }
 390
 391 static uint64List *uint64_list(uint64_t *list, int size)
 392 {
 393     int i;
 394     uint64List *out_list = NULL;
 395     uint64List **tail = &out_list;
 396
 397     for (i = 0; i < size; i++) {
 398         QAPI_LIST_APPEND(tail, list[i]);
 399     }
 400
 401     return out_list;
 402 }
 403
 404 static BlockLatencyHistogramInfo *
 405 bdrv_latency_histogram_stats(BlockLatencyHistogram *hist)
 406 {
 407     BlockLatencyHistogramInfo *info;
 408
 409     if (!hist->bins) {
 410         return NULL;
 411     }
 412
 413     info = g_new0(BlockLatencyHistogramInfo, 1);
 414     info->boundaries = uint64_list(hist->boundaries, hist->nbins - 1);
 415     info->bins = uint64_list(hist->bins, hist->nbins);
 416     return info;
 417 }
 418
 419 static void bdrv_query_blk_stats(BlockDeviceStats *ds, BlockBackend *blk)
 420 {
 421     BlockAcctStats *stats = blk_get_stats(blk);
 422     BlockAcctTimedStats *ts = NULL;
 423     BlockLatencyHistogram *hgram;
 424
 425     ds->rd_bytes = stats->nr_bytes[BLOCK_ACCT_READ];
 426     ds->wr_bytes = stats->nr_bytes[BLOCK_ACCT_WRITE];
 427     ds->unmap_bytes = stats->nr_bytes[BLOCK_ACCT_UNMAP];
 428     ds->rd_operations = stats->nr_ops[BLOCK_ACCT_READ];
 429     ds->wr_operations = stats->nr_ops[BLOCK_ACCT_WRITE];
 430     ds->unmap_operations = stats->nr_ops[BLOCK_ACCT_UNMAP];
 431
 432     ds->failed_rd_operations = stats->failed_ops[BLOCK_ACCT_READ];
 433     ds->failed_wr_operations = stats->failed_ops[BLOCK_ACCT_WRITE];
 434     ds->failed_flush_operations = stats->failed_ops[BLOCK_ACCT_FLUSH];
 435     ds->failed_unmap_operations = stats->failed_ops[BLOCK_ACCT_UNMAP];
 436
 437     ds->invalid_rd_operations = stats->invalid_ops[BLOCK_ACCT_READ];
 438     ds->invalid_wr_operations = stats->invalid_ops[BLOCK_ACCT_WRITE];
 439     ds->invalid_flush_operations =
 440         stats->invalid_ops[BLOCK_ACCT_FLUSH];
 441     ds->invalid_unmap_operations = stats->invalid_ops[BLOCK_ACCT_UNMAP];
 442
 443     ds->rd_merged = stats->merged[BLOCK_ACCT_READ];
 444     ds->wr_merged = stats->merged[BLOCK_ACCT_WRITE];
 445     ds->unmap_merged = stats->merged[BLOCK_ACCT_UNMAP];
 446     ds->flush_operations = stats->nr_ops[BLOCK_ACCT_FLUSH];
 447     ds->wr_total_time_ns = stats->total_time_ns[BLOCK_ACCT_WRITE];
 448     ds->rd_total_time_ns = stats->total_time_ns[BLOCK_ACCT_READ];
 449     ds->flush_total_time_ns = stats->total_time_ns[BLOCK_ACCT_FLUSH];
 450     ds->unmap_total_time_ns = stats->total_time_ns[BLOCK_ACCT_UNMAP];
 451
 452     ds->has_idle_time_ns = stats->last_access_time_ns > 0;
 453     if (ds->has_idle_time_ns) {
 454         ds->idle_time_ns = block_acct_idle_time_ns(stats);
 455     }
 456
 457     ds->account_invalid = stats->account_invalid;
 458     ds->account_failed = stats->account_failed;
 459
 460     while ((ts = block_acct_interval_next(stats, ts))) {
 461         BlockDeviceTimedStats *dev_stats = g_malloc0(sizeof(*dev_stats));
 462
 463         TimedAverage *rd = &ts->latency[BLOCK_ACCT_READ];
 464         TimedAverage *wr = &ts->latency[BLOCK_ACCT_WRITE];
 465         TimedAverage *fl = &ts->latency[BLOCK_ACCT_FLUSH];
 466
 467         dev_stats->interval_length = ts->interval_length;
 468
 469         dev_stats->min_rd_latency_ns = timed_average_min(rd);
 470         dev_stats->max_rd_latency_ns = timed_average_max(rd);
 471         dev_stats->avg_rd_latency_ns = timed_average_avg(rd);
 472
 473         dev_stats->min_wr_latency_ns = timed_average_min(wr);
 474         dev_stats->max_wr_latency_ns = timed_average_max(wr);
 475         dev_stats->avg_wr_latency_ns = timed_average_avg(wr);
 476
 477         dev_stats->min_flush_latency_ns = timed_average_min(fl);
 478         dev_stats->max_flush_latency_ns = timed_average_max(fl);
 479         dev_stats->avg_flush_latency_ns = timed_average_avg(fl);
 480
 481         dev_stats->avg_rd_queue_depth =
 482             block_acct_queue_depth(ts, BLOCK_ACCT_READ);
 483         dev_stats->avg_wr_queue_depth =
 484             block_acct_queue_depth(ts, BLOCK_ACCT_WRITE);
 485
 486         QAPI_LIST_PREPEND(ds->timed_stats, dev_stats);
 487     }
 488
 489     hgram = stats->latency_histogram;
 490     ds->rd_latency_histogram
 491         = bdrv_latency_histogram_stats(&hgram[BLOCK_ACCT_READ]);
 492     ds->wr_latency_histogram
 493         = bdrv_latency_histogram_stats(&hgram[BLOCK_ACCT_WRITE]);
 494     ds->flush_latency_histogram
 495         = bdrv_latency_histogram_stats(&hgram[BLOCK_ACCT_FLUSH]);
 496 }
 497
 498 static BlockStats *bdrv_query_bds_stats(BlockDriverState *bs,
 499                                         bool blk_level)
 500 {
 501     BdrvChild *parent_child;
 502     BlockDriverState *filter_or_cow_bs;
 503     BlockStats *s = NULL;
 504
 505     s = g_malloc0(sizeof(*s));
 506     s->stats = g_malloc0(sizeof(*s->stats));
 507
 508     if (!bs) {
 509         return s;
 510     }
 511
 512     /* Skip automatically inserted nodes that the user isn't aware of in
 513      * a BlockBackend-level command. Stay at the exact node for a node-level
 514      * command. */
 515     if (blk_level) {
 516         bs = bdrv_skip_implicit_filters(bs);
 517     }
 518
 519     if (bdrv_get_node_name(bs)[0]) {
 520         s->node_name = g_strdup(bdrv_get_node_name(bs));
 521     }
 522
 523     s->stats->wr_highest_offset = stat64_get(&bs->wr_highest_offset);
 524
 525     s->driver_specific = bdrv_get_specific_stats(bs);
 526
 527     parent_child = bdrv_primary_child(bs);
 528     if (!parent_child ||
 529         !(parent_child->role & (BDRV_CHILD_DATA | BDRV_CHILD_FILTERED)))
 530     {
 531         BdrvChild *c;
 532
 533         /*
 534          * Look for a unique data-storing child.  We do not need to look for
 535          * filtered children, as there would be only one and it would have been
 536          * the primary child.
 537          */
 538         parent_child = NULL;
 539         QLIST_FOREACH(c, &bs->children, next) {
 540             if (c->role & BDRV_CHILD_DATA) {
 541                 if (parent_child) {
 542                     /*
 543                      * There are multiple data-storing children and we cannot
 544                      * choose between them.
 545                      */
 546                     parent_child = NULL;
 547                     break;
 548                 }
 549                 parent_child = c;
 550             }
 551         }
 552     }
 553     if (parent_child) {
 554         s->parent = bdrv_query_bds_stats(parent_child->bs, blk_level);
 555     }
 556
 557     filter_or_cow_bs = bdrv_filter_or_cow_bs(bs);
 558     if (blk_level && filter_or_cow_bs) {
 559         /*
 560          * Put any filtered or COW child here (for backwards
 561          * compatibility to when we put bs0->backing here, which might
 562          * be either)
 563          */
 564         s->backing = bdrv_query_bds_stats(filter_or_cow_bs, blk_level);
 565     }
 566
 567     return s;
 568 }
 569
 570 BlockInfoList *qmp_query_block(Error **errp)
 571 {
 572     BlockInfoList *head = NULL, **p_next = &head;
 573     BlockBackend *blk;
 574     Error *local_err = NULL;
 575
 576     for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
 577         BlockInfoList *info;
 578
 579         if (!*blk_name(blk) && !blk_get_attached_dev(blk)) {
 580             continue;
 581         }
 582
 583         info = g_malloc0(sizeof(*info));
 584         bdrv_query_info(blk, &info->value, &local_err);
 585         if (local_err) {
 586             error_propagate(errp, local_err);
 587             g_free(info);
 588             qapi_free_BlockInfoList(head);
 589             return NULL;
 590         }
 591
 592         *p_next = info;
 593         p_next = &info->next;
 594     }
 595
 596     return head;
 597 }
 598
 599 BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
 600                                      bool query_nodes,
 601                                      Error **errp)
 602 {
 603     BlockStatsList *head = NULL, **tail = &head;
 604     BlockBackend *blk;
 605     BlockDriverState *bs;
 606
 607     /* Just to be safe if query_nodes is not always initialized */
 608     if (has_query_nodes && query_nodes) {
 609         for (bs = bdrv_next_node(NULL); bs; bs = bdrv_next_node(bs)) {
 610             AioContext *ctx = bdrv_get_aio_context(bs);
 611
 612             aio_context_acquire(ctx);
 613             QAPI_LIST_APPEND(tail, bdrv_query_bds_stats(bs, false));
 614             aio_context_release(ctx);
 615         }
 616     } else {
 617         for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) {
 618             AioContext *ctx = blk_get_aio_context(blk);
 619             BlockStats *s;
 620             char *qdev;
 621
 622             if (!*blk_name(blk) && !blk_get_attached_dev(blk)) {
 623                 continue;
 624             }
 625
 626             aio_context_acquire(ctx);
 627             s = bdrv_query_bds_stats(blk_bs(blk), true);
 628             s->device = g_strdup(blk_name(blk));
 629
 630             qdev = blk_get_attached_dev_id(blk);
 631             if (qdev && *qdev) {
 632                 s->qdev = qdev;
 633             } else {
 634                 g_free(qdev);
 635             }
 636
 637             bdrv_query_blk_stats(s->stats, blk);
 638             aio_context_release(ctx);
 639
 640             QAPI_LIST_APPEND(tail, s);
 641         }
 642     }
 643
 644     return head;
 645 }
 646
 647 void bdrv_snapshot_dump(QEMUSnapshotInfo *sn)
 648 {
 649     char clock_buf[128];
 650     char icount_buf[128] = {0};
 651     int64_t secs;
 652     char *sizing = NULL;
 653
 654     if (!sn) {
 655         qemu_printf("%-10s%-17s%8s%20s%13s%11s",
 656                     "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK", "ICOUNT");
 657     } else {
 658         g_autoptr(GDateTime) date = g_date_time_new_from_unix_local(sn->date_sec);
 659         g_autofree char *date_buf = g_date_time_format(date, "%Y-%m-%d %H:%M:%S");
 660
 661         secs = sn->vm_clock_nsec / 1000000000;
 662         snprintf(clock_buf, sizeof(clock_buf),
 663                  "%02d:%02d:%02d.%03d",
 664                  (int)(secs / 3600),
 665                  (int)((secs / 60) % 60),
 666                  (int)(secs % 60),
 667                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
 668         sizing = size_to_str(sn->vm_state_size);
 669         if (sn->icount != -1ULL) {
 670             snprintf(icount_buf, sizeof(icount_buf),
 671                 "%"PRId64, sn->icount);
 672         }
 673         qemu_printf("%-9s %-16s %8s%20s%13s%11s",
 674                     sn->id_str, sn->name,
 675                     sizing,
 676                     date_buf,
 677                     clock_buf,
 678                     icount_buf);
 679     }
 680     g_free(sizing);
 681 }
 682
 683 static void dump_qdict(int indentation, QDict *dict);
 684 static void dump_qlist(int indentation, QList *list);
 685
 686 static void dump_qobject(int comp_indent, QObject *obj)
 687 {
 688     switch (qobject_type(obj)) {
 689         case QTYPE_QNUM: {
 690             QNum *value = qobject_to(QNum, obj);
 691             char *tmp = qnum_to_string(value);
 692             qemu_printf("%s", tmp);
 693             g_free(tmp);
 694             break;
 695         }
 696         case QTYPE_QSTRING: {
 697             QString *value = qobject_to(QString, obj);
 698             qemu_printf("%s", qstring_get_str(value));
 699             break;
 700         }
 701         case QTYPE_QDICT: {
 702             QDict *value = qobject_to(QDict, obj);
 703             dump_qdict(comp_indent, value);
 704             break;
 705         }
 706         case QTYPE_QLIST: {
 707             QList *value = qobject_to(QList, obj);
 708             dump_qlist(comp_indent, value);
 709             break;
 710         }
 711         case QTYPE_QBOOL: {
 712             QBool *value = qobject_to(QBool, obj);
 713             qemu_printf("%s", qbool_get_bool(value) ? "true" : "false");
 714             break;
 715         }
 716         default:
 717             abort();
 718     }
 719 }
 720
 721 static void dump_qlist(int indentation, QList *list)
 722 {
 723     const QListEntry *entry;
 724     int i = 0;
 725
 726     for (entry = qlist_first(list); entry; entry = qlist_next(entry), i++) {
 727         QType type = qobject_type(entry->value);
 728         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 729         qemu_printf("%*s[%i]:%c", indentation * 4, "", i,
 730                     composite ? '\n' : ' ');
 731         dump_qobject(indentation + 1, entry->value);
 732         if (!composite) {
 733             qemu_printf("\n");
 734         }
 735     }
 736 }
 737
 738 static void dump_qdict(int indentation, QDict *dict)
 739 {
 740     const QDictEntry *entry;
 741
 742     for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
 743         QType type = qobject_type(entry->value);
 744         bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
 745         char *key = g_malloc(strlen(entry->key) + 1);
 746         int i;
 747
 748         /* replace dashes with spaces in key (variable) names */
 749         for (i = 0; entry->key[i]; i++) {
 750             key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];
 751         }
 752         key[i] = 0;
 753         qemu_printf("%*s%s:%c", indentation * 4, "", key,
 754                     composite ? '\n' : ' ');
 755         dump_qobject(indentation + 1, entry->value);
 756         if (!composite) {
 757             qemu_printf("\n");
 758         }
 759         g_free(key);
 760     }
 761 }
 762
 763 void bdrv_image_info_specific_dump(ImageInfoSpecific *info_spec)
 764 {
 765     QObject *obj, *data;
 766     Visitor *v = qobject_output_visitor_new(&obj);
 767
 768     visit_type_ImageInfoSpecific(v, NULL, &info_spec, &error_abort);
 769     visit_complete(v, &obj);
 770     data = qdict_get(qobject_to(QDict, obj), "data");
 771     dump_qobject(1, data);
 772     qobject_unref(obj);
 773     visit_free(v);
 774 }
 775
 776 void bdrv_image_info_dump(ImageInfo *info)
 777 {
 778     char *size_buf, *dsize_buf;
 779     if (!info->has_actual_size) {
 780         dsize_buf = g_strdup("unavailable");
 781     } else {
 782         dsize_buf = size_to_str(info->actual_size);
 783     }
 784     size_buf = size_to_str(info->virtual_size);
 785     qemu_printf("image: %s\n"
 786                 "file format: %s\n"
 787                 "virtual size: %s (%" PRId64 " bytes)\n"
 788                 "disk size: %s\n",
 789                 info->filename, info->format, size_buf,
 790                 info->virtual_size,
 791                 dsize_buf);
 792     g_free(size_buf);
 793     g_free(dsize_buf);
 794
 795     if (info->has_encrypted && info->encrypted) {
 796         qemu_printf("encrypted: yes\n");
 797     }
 798
 799     if (info->has_cluster_size) {
 800         qemu_printf("cluster_size: %" PRId64 "\n",
 801                     info->cluster_size);
 802     }
 803
 804     if (info->has_dirty_flag && info->dirty_flag) {
 805         qemu_printf("cleanly shut down: no\n");
 806     }
 807
 808     if (info->backing_filename) {
 809         qemu_printf("backing file: %s", info->backing_filename);
 810         if (!info->full_backing_filename) {
 811             qemu_printf(" (cannot determine actual path)");
 812         } else if (strcmp(info->backing_filename,
 813                           info->full_backing_filename) != 0) {
 814             qemu_printf(" (actual path: %s)", info->full_backing_filename);
 815         }
 816         qemu_printf("\n");
 817         if (info->backing_filename_format) {
 818             qemu_printf("backing file format: %s\n",
 819                         info->backing_filename_format);
 820         }
 821     }
 822
 823     if (info->has_snapshots) {
 824         SnapshotInfoList *elem;
 825
 826         qemu_printf("Snapshot list:\n");
 827         bdrv_snapshot_dump(NULL);
 828         qemu_printf("\n");
 829
 830         /* Ideally bdrv_snapshot_dump() would operate on SnapshotInfoList but
 831          * we convert to the block layer's native QEMUSnapshotInfo for now.
 832          */
 833         for (elem = info->snapshots; elem; elem = elem->next) {
 834             QEMUSnapshotInfo sn = {
 835                 .vm_state_size = elem->value->vm_state_size,
 836                 .date_sec = elem->value->date_sec,
 837                 .date_nsec = elem->value->date_nsec,
 838                 .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL +
 839                                  elem->value->vm_clock_nsec,
 840                 .icount = elem->value->has_icount ?
 841                           elem->value->icount : -1ULL,
 842             };
 843
 844             pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id);
 845             pstrcpy(sn.name, sizeof(sn.name), elem->value->name);
 846             bdrv_snapshot_dump(&sn);
 847             qemu_printf("\n");
 848         }
 849     }
 850
 851     if (info->format_specific) {
 852         qemu_printf("Format specific information:\n");
 853         bdrv_image_info_specific_dump(info->format_specific);
 854     }
 855 }