include/block/block.h

   1 #ifndef BLOCK_H
   2 #define BLOCK_H
   3
   4 #include "block/aio.h"
   5 #include "qemu-common.h"
   6 #include "qemu/option.h"
   7 #include "block/coroutine.h"
   8 #include "qapi/qmp/qobject.h"
   9 #include "qapi-types.h"
  10
  11 /* block.c */
  12 typedef struct BlockDriver BlockDriver;
  13 typedef struct BlockJob BlockJob;
  14
  15 typedef struct BlockDriverInfo {
  16     /* in bytes, 0 if irrelevant */
  17     int cluster_size;
  18     /* offset at which the VM state can be saved (0 if not possible) */
  19     int64_t vm_state_offset;
  20     bool is_dirty;
  21 } BlockDriverInfo;
  22
  23 typedef struct BlockFragInfo {
  24     uint64_t allocated_clusters;
  25     uint64_t total_clusters;
  26     uint64_t fragmented_clusters;
  27     uint64_t compressed_clusters;
  28 } BlockFragInfo;
  29
  30 /* Callbacks for block device models */
  31 typedef struct BlockDevOps {
  32     /*
  33      * Runs when virtual media changed (monitor commands eject, change)
  34      * Argument load is true on load and false on eject.
  35      * Beware: doesn't run when a host device's physical media
  36      * changes.  Sure would be useful if it did.
  37      * Device models with removable media must implement this callback.
  38      */
  39     void (*change_media_cb)(void *opaque, bool load);
  40     /*
  41      * Runs when an eject request is issued from the monitor, the tray
  42      * is closed, and the medium is locked.
  43      * Device models that do not implement is_medium_locked will not need
  44      * this callback.  Device models that can lock the medium or tray might
  45      * want to implement the callback and unlock the tray when "force" is
  46      * true, even if they do not support eject requests.
  47      */
  48     void (*eject_request_cb)(void *opaque, bool force);
  49     /*
  50      * Is the virtual tray open?
  51      * Device models implement this only when the device has a tray.
  52      */
  53     bool (*is_tray_open)(void *opaque);
  54     /*
  55      * Is the virtual medium locked into the device?
  56      * Device models implement this only when device has such a lock.
  57      */
  58     bool (*is_medium_locked)(void *opaque);
  59     /*
  60      * Runs when the size changed (e.g. monitor command block_resize)
  61      */
  62     void (*resize_cb)(void *opaque);
  63 } BlockDevOps;
  64
  65 typedef enum {
  66     BDRV_REQ_COPY_ON_READ = 0x1,
  67     BDRV_REQ_ZERO_WRITE   = 0x2,
  68 } BdrvRequestFlags;
  69
  70 #define BDRV_O_RDWR        0x0002
  71 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  72 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  73 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  74 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  75 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  76 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
  77 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
  78 #define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
  79 #define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
  80 #define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
  81 #define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */
  82
  83 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
  84
  85 #define BDRV_SECTOR_BITS   9
  86 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
  87 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
  88
  89 /* BDRV_BLOCK_DATA: data is read from bs->file or another file
  90  * BDRV_BLOCK_ZERO: sectors read as zero
  91  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
  92  * BDRV_BLOCK_RAW: used internally to indicate that the request
  93  *                 was answered by the raw driver and that one
  94  *                 should look in bs->file directly.
  95  *
  96  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
  97  * bs->file where sector data can be read from as raw data.
  98  *
  99  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
 100  *
 101  * DATA ZERO OFFSET_VALID
 102  *  t    t        t       sectors read as zero, bs->file is zero at offset
 103  *  t    f        t       sectors read as valid from bs->file at offset
 104  *  f    t        t       sectors preallocated, read as zero, bs->file not
 105  *                        necessarily zero at offset
 106  *  f    f        t       sectors preallocated but read from backing_hd,
 107  *                        bs->file contains garbage at offset
 108  *  t    t        f       sectors preallocated, read as zero, unknown offset
 109  *  t    f        f       sectors read from unknown file or offset
 110  *  f    t        f       not allocated or unknown offset, read as zero
 111  *  f    f        f       not allocated or unknown offset, read from backing_hd
 112  */
 113 #define BDRV_BLOCK_DATA         1
 114 #define BDRV_BLOCK_ZERO         2
 115 #define BDRV_BLOCK_OFFSET_VALID 4
 116 #define BDRV_BLOCK_RAW          8
 117 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 118
 119 typedef enum {
 120     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
 121 } BlockErrorAction;
 122
 123 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 124
 125 typedef struct BDRVReopenState {
 126     BlockDriverState *bs;
 127     int flags;
 128     void *opaque;
 129 } BDRVReopenState;
 130
 131
 132 void bdrv_iostatus_enable(BlockDriverState *bs);
 133 void bdrv_iostatus_reset(BlockDriverState *bs);
 134 void bdrv_iostatus_disable(BlockDriverState *bs);
 135 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 136 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 137 void bdrv_info_print(Monitor *mon, const QObject *data);
 138 void bdrv_info(Monitor *mon, QObject **ret_data);
 139 void bdrv_stats_print(Monitor *mon, const QObject *data);
 140 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 141
 142 /* disk I/O throttling */
 143 void bdrv_io_limits_enable(BlockDriverState *bs);
 144 void bdrv_io_limits_disable(BlockDriverState *bs);
 145
 146 void bdrv_init(void);
 147 void bdrv_init_with_whitelist(void);
 148 BlockDriver *bdrv_find_protocol(const char *filename,
 149                                 bool allow_protocol_prefix);
 150 BlockDriver *bdrv_find_format(const char *format_name);
 151 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
 152                                           bool readonly);
 153 int bdrv_create(BlockDriver *drv, const char* filename,
 154     QEMUOptionParameter *options, Error **errp);
 155 int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
 156                      Error **errp);
 157 BlockDriverState *bdrv_new(const char *device_name);
 158 void bdrv_make_anon(BlockDriverState *bs);
 159 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 160 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 161 int bdrv_parse_cache_flags(const char *mode, int *flags);
 162 int bdrv_parse_discard_flags(const char *mode, int *flags);
 163 int bdrv_file_open(BlockDriverState **pbs, const char *filename,
 164                    QDict *options, int flags, Error **errp);
 165 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 166 int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
 167               int flags, BlockDriver *drv, Error **errp);
 168 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 169                                     BlockDriverState *bs, int flags);
 170 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 171 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 172 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 173                         BlockReopenQueue *queue, Error **errp);
 174 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 175 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 176 void bdrv_close(BlockDriverState *bs);
 177 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 178 int bdrv_attach_dev(BlockDriverState *bs, void *dev);
 179 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
 180 void bdrv_detach_dev(BlockDriverState *bs, void *dev);
 181 void *bdrv_get_attached_dev(BlockDriverState *bs);
 182 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
 183                       void *opaque);
 184 void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
 185 bool bdrv_dev_has_removable_media(BlockDriverState *bs);
 186 bool bdrv_dev_is_tray_open(BlockDriverState *bs);
 187 bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
 188 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 189               uint8_t *buf, int nb_sectors);
 190 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 191                           uint8_t *buf, int nb_sectors);
 192 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 193                const uint8_t *buf, int nb_sectors);
 194 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 195                int nb_sectors, BdrvRequestFlags flags);
 196 int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov);
 197 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 198                void *buf, int count);
 199 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 200                 const void *buf, int count);
 201 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 202 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 203     const void *buf, int count);
 204 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 205     int nb_sectors, QEMUIOVector *qiov);
 206 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 207     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 208 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 209     int nb_sectors, QEMUIOVector *qiov);
 210 /*
 211  * Efficiently zero a region of the disk image.  Note that this is a regular
 212  * I/O request like read or write and should have a reasonable size.  This
 213  * function is not suitable for zeroing the entire image in a single request
 214  * because it may allocate memory for the entire region.
 215  */
 216 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 217     int nb_sectors, BdrvRequestFlags flags);
 218 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 219     const char *backing_file);
 220 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 221 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 222 int64_t bdrv_getlength(BlockDriverState *bs);
 223 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 224 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 225 int bdrv_commit(BlockDriverState *bs);
 226 int bdrv_commit_all(void);
 227 int bdrv_change_backing_file(BlockDriverState *bs,
 228     const char *backing_file, const char *backing_fmt);
 229 void bdrv_register(BlockDriver *bdrv);
 230 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 231                            BlockDriverState *base);
 232 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 233                                     BlockDriverState *bs);
 234 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 235
 236
 237 typedef struct BdrvCheckResult {
 238     int corruptions;
 239     int leaks;
 240     int check_errors;
 241     int corruptions_fixed;
 242     int leaks_fixed;
 243     int64_t image_end_offset;
 244     BlockFragInfo bfi;
 245 } BdrvCheckResult;
 246
 247 typedef enum {
 248     BDRV_FIX_LEAKS    = 1,
 249     BDRV_FIX_ERRORS   = 2,
 250 } BdrvCheckMode;
 251
 252 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 253
 254 int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);
 255
 256 /* external snapshots */
 257
 258 typedef enum {
 259     EXT_SNAPSHOT_ALLOWED,
 260     EXT_SNAPSHOT_FORBIDDEN,
 261 } ExtSnapshotPerm;
 262
 263 /* return EXT_SNAPSHOT_ALLOWED if external snapshot is allowed
 264  * return EXT_SNAPSHOT_FORBIDDEN if external snapshot is forbidden
 265  */
 266 ExtSnapshotPerm bdrv_check_ext_snapshot(BlockDriverState *bs);
 267 /* helper used to forbid external snapshots like in blkverify */
 268 ExtSnapshotPerm bdrv_check_ext_snapshot_forbidden(BlockDriverState *bs);
 269
 270 /* async block I/O */
 271 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 272                                      int sector_num);
 273 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 274                                  QEMUIOVector *iov, int nb_sectors,
 275                                  BlockDriverCompletionFunc *cb, void *opaque);
 276 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 277                                   QEMUIOVector *iov, int nb_sectors,
 278                                   BlockDriverCompletionFunc *cb, void *opaque);
 279 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 280                                  BlockDriverCompletionFunc *cb, void *opaque);
 281 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 282                                    int64_t sector_num, int nb_sectors,
 283                                    BlockDriverCompletionFunc *cb, void *opaque);
 284 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 285
 286 typedef struct BlockRequest {
 287     /* Fields to be filled by multiwrite caller */
 288     int64_t sector;
 289     int nb_sectors;
 290     QEMUIOVector *qiov;
 291     BlockDriverCompletionFunc *cb;
 292     void *opaque;
 293
 294     /* Filled by multiwrite implementation */
 295     int error;
 296 } BlockRequest;
 297
 298 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 299     int num_reqs);
 300
 301 /* sg packet commands */
 302 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 303 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 304         unsigned long int req, void *buf,
 305         BlockDriverCompletionFunc *cb, void *opaque);
 306
 307 /* Invalidate any cached metadata used by image formats */
 308 void bdrv_invalidate_cache(BlockDriverState *bs);
 309 void bdrv_invalidate_cache_all(void);
 310
 311 void bdrv_clear_incoming_migration_all(void);
 312
 313 /* Ensure contents are flushed to disk.  */
 314 int bdrv_flush(BlockDriverState *bs);
 315 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 316 int bdrv_flush_all(void);
 317 void bdrv_close_all(void);
 318 void bdrv_drain_all(void);
 319
 320 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 321 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 322 int bdrv_has_zero_init_1(BlockDriverState *bs);
 323 int bdrv_has_zero_init(BlockDriverState *bs);
 324 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 325                               int nb_sectors, int *pnum);
 326 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 327                       int *pnum);
 328 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 329                             int64_t sector_num, int nb_sectors, int *pnum);
 330
 331 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 332                        BlockdevOnError on_write_error);
 333 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 334 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 335 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 336                        bool is_read, int error);
 337 int bdrv_is_read_only(BlockDriverState *bs);
 338 int bdrv_is_sg(BlockDriverState *bs);
 339 int bdrv_enable_write_cache(BlockDriverState *bs);
 340 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 341 int bdrv_is_inserted(BlockDriverState *bs);
 342 int bdrv_media_changed(BlockDriverState *bs);
 343 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 344 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 345 const char *bdrv_get_format_name(BlockDriverState *bs);
 346 BlockDriverState *bdrv_find(const char *name);
 347 BlockDriverState *bdrv_next(BlockDriverState *bs);
 348 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 349                   void *opaque);
 350 int bdrv_is_encrypted(BlockDriverState *bs);
 351 int bdrv_key_required(BlockDriverState *bs);
 352 int bdrv_set_key(BlockDriverState *bs, const char *key);
 353 int bdrv_query_missing_keys(void);
 354 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 355                          void *opaque);
 356 const char *bdrv_get_device_name(BlockDriverState *bs);
 357 int bdrv_get_flags(BlockDriverState *bs);
 358 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 359                           const uint8_t *buf, int nb_sectors);
 360 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 361 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 362 void bdrv_round_to_clusters(BlockDriverState *bs,
 363                             int64_t sector_num, int nb_sectors,
 364                             int64_t *cluster_sector_num,
 365                             int *cluster_nb_sectors);
 366
 367 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 368 void bdrv_get_backing_filename(BlockDriverState *bs,
 369                                char *filename, int filename_size);
 370 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 371                                     char *dest, size_t sz);
 372 int bdrv_is_snapshot(BlockDriverState *bs);
 373
 374 int path_is_absolute(const char *path);
 375 void path_combine(char *dest, int dest_size,
 376                   const char *base_path,
 377                   const char *filename);
 378
 379 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 380 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 381                       int64_t pos, int size);
 382
 383 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 384                       int64_t pos, int size);
 385
 386 void bdrv_img_create(const char *filename, const char *fmt,
 387                      const char *base_filename, const char *base_fmt,
 388                      char *options, uint64_t img_size, int flags,
 389                      Error **errp, bool quiet);
 390
 391 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
 392 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 393 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 394
 395 struct HBitmapIter;
 396 void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity);
 397 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 398 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 399 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 400 void bdrv_dirty_iter_init(BlockDriverState *bs, struct HBitmapIter *hbi);
 401 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 402
 403 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 404 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 405
 406 void bdrv_ref(BlockDriverState *bs);
 407 void bdrv_unref(BlockDriverState *bs);
 408 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 409 int bdrv_in_use(BlockDriverState *bs);
 410
 411 #ifdef CONFIG_LINUX_AIO
 412 int raw_get_aio_fd(BlockDriverState *bs);
 413 #else
 414 static inline int raw_get_aio_fd(BlockDriverState *bs)
 415 {
 416     return -ENOTSUP;
 417 }
 418 #endif
 419
 420 enum BlockAcctType {
 421     BDRV_ACCT_READ,
 422     BDRV_ACCT_WRITE,
 423     BDRV_ACCT_FLUSH,
 424     BDRV_MAX_IOTYPE,
 425 };
 426
 427 typedef struct BlockAcctCookie {
 428     int64_t bytes;
 429     int64_t start_time_ns;
 430     enum BlockAcctType type;
 431 } BlockAcctCookie;
 432
 433 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 434         int64_t bytes, enum BlockAcctType type);
 435 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 436
 437 typedef enum {
 438     BLKDBG_L1_UPDATE,
 439
 440     BLKDBG_L1_GROW_ALLOC_TABLE,
 441     BLKDBG_L1_GROW_WRITE_TABLE,
 442     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 443
 444     BLKDBG_L2_LOAD,
 445     BLKDBG_L2_UPDATE,
 446     BLKDBG_L2_UPDATE_COMPRESSED,
 447     BLKDBG_L2_ALLOC_COW_READ,
 448     BLKDBG_L2_ALLOC_WRITE,
 449
 450     BLKDBG_READ_AIO,
 451     BLKDBG_READ_BACKING_AIO,
 452     BLKDBG_READ_COMPRESSED,
 453
 454     BLKDBG_WRITE_AIO,
 455     BLKDBG_WRITE_COMPRESSED,
 456
 457     BLKDBG_VMSTATE_LOAD,
 458     BLKDBG_VMSTATE_SAVE,
 459
 460     BLKDBG_COW_READ,
 461     BLKDBG_COW_WRITE,
 462
 463     BLKDBG_REFTABLE_LOAD,
 464     BLKDBG_REFTABLE_GROW,
 465     BLKDBG_REFTABLE_UPDATE,
 466
 467     BLKDBG_REFBLOCK_LOAD,
 468     BLKDBG_REFBLOCK_UPDATE,
 469     BLKDBG_REFBLOCK_UPDATE_PART,
 470     BLKDBG_REFBLOCK_ALLOC,
 471     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 472     BLKDBG_REFBLOCK_ALLOC_WRITE,
 473     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 474     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 475     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 476
 477     BLKDBG_CLUSTER_ALLOC,
 478     BLKDBG_CLUSTER_ALLOC_BYTES,
 479     BLKDBG_CLUSTER_FREE,
 480
 481     BLKDBG_FLUSH_TO_OS,
 482     BLKDBG_FLUSH_TO_DISK,
 483
 484     BLKDBG_EVENT_MAX,
 485 } BlkDebugEvent;
 486
 487 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 488 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 489
 490 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 491                            const char *tag);
 492 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 493 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 494
 495 #endif