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     /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
  69      * is allowed to optimize a write zeroes request by unmapping (discarding)
  70      * blocks if it is guaranteed that the result will read back as
  71      * zeroes. The flag is only passed to the driver if the block device is
  72      * opened with BDRV_O_UNMAP.
  73      */
  74     BDRV_REQ_MAY_UNMAP    = 0x4,
  75 } BdrvRequestFlags;
  76
  77 #define BDRV_O_RDWR        0x0002
  78 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  79 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  80 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  81 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  82 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  83 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
  84 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
  85 #define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
  86 #define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
  87 #define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
  88 #define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */
  89
  90 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
  91
  92 #define BDRV_SECTOR_BITS   9
  93 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
  94 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
  95
  96 /* BDRV_BLOCK_DATA: data is read from bs->file or another file
  97  * BDRV_BLOCK_ZERO: sectors read as zero
  98  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
  99  * BDRV_BLOCK_RAW: used internally to indicate that the request
 100  *                 was answered by the raw driver and that one
 101  *                 should look in bs->file directly.
 102  *
 103  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
 104  * bs->file where sector data can be read from as raw data.
 105  *
 106  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
 107  *
 108  * DATA ZERO OFFSET_VALID
 109  *  t    t        t       sectors read as zero, bs->file is zero at offset
 110  *  t    f        t       sectors read as valid from bs->file at offset
 111  *  f    t        t       sectors preallocated, read as zero, bs->file not
 112  *                        necessarily zero at offset
 113  *  f    f        t       sectors preallocated but read from backing_hd,
 114  *                        bs->file contains garbage at offset
 115  *  t    t        f       sectors preallocated, read as zero, unknown offset
 116  *  t    f        f       sectors read from unknown file or offset
 117  *  f    t        f       not allocated or unknown offset, read as zero
 118  *  f    f        f       not allocated or unknown offset, read from backing_hd
 119  */
 120 #define BDRV_BLOCK_DATA         1
 121 #define BDRV_BLOCK_ZERO         2
 122 #define BDRV_BLOCK_OFFSET_VALID 4
 123 #define BDRV_BLOCK_RAW          8
 124 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 125
 126 typedef enum {
 127     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
 128 } BlockErrorAction;
 129
 130 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 131
 132 typedef struct BDRVReopenState {
 133     BlockDriverState *bs;
 134     int flags;
 135     void *opaque;
 136 } BDRVReopenState;
 137
 138
 139 void bdrv_iostatus_enable(BlockDriverState *bs);
 140 void bdrv_iostatus_reset(BlockDriverState *bs);
 141 void bdrv_iostatus_disable(BlockDriverState *bs);
 142 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 143 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 144 void bdrv_info_print(Monitor *mon, const QObject *data);
 145 void bdrv_info(Monitor *mon, QObject **ret_data);
 146 void bdrv_stats_print(Monitor *mon, const QObject *data);
 147 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 148
 149 /* disk I/O throttling */
 150 void bdrv_io_limits_enable(BlockDriverState *bs);
 151 void bdrv_io_limits_disable(BlockDriverState *bs);
 152
 153 void bdrv_init(void);
 154 void bdrv_init_with_whitelist(void);
 155 BlockDriver *bdrv_find_protocol(const char *filename,
 156                                 bool allow_protocol_prefix);
 157 BlockDriver *bdrv_find_format(const char *format_name);
 158 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
 159                                           bool readonly);
 160 int bdrv_create(BlockDriver *drv, const char* filename,
 161     QEMUOptionParameter *options, Error **errp);
 162 int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
 163                      Error **errp);
 164 BlockDriverState *bdrv_new(const char *device_name);
 165 void bdrv_make_anon(BlockDriverState *bs);
 166 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 167 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 168 int bdrv_parse_cache_flags(const char *mode, int *flags);
 169 int bdrv_parse_discard_flags(const char *mode, int *flags);
 170 int bdrv_file_open(BlockDriverState **pbs, const char *filename,
 171                    QDict *options, int flags, Error **errp);
 172 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 173 int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
 174               int flags, BlockDriver *drv, Error **errp);
 175 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 176                                     BlockDriverState *bs, int flags);
 177 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 178 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 179 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 180                         BlockReopenQueue *queue, Error **errp);
 181 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 182 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 183 void bdrv_close(BlockDriverState *bs);
 184 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 185 int bdrv_attach_dev(BlockDriverState *bs, void *dev);
 186 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
 187 void bdrv_detach_dev(BlockDriverState *bs, void *dev);
 188 void *bdrv_get_attached_dev(BlockDriverState *bs);
 189 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
 190                       void *opaque);
 191 void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
 192 bool bdrv_dev_has_removable_media(BlockDriverState *bs);
 193 bool bdrv_dev_is_tray_open(BlockDriverState *bs);
 194 bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
 195 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 196               uint8_t *buf, int nb_sectors);
 197 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 198                           uint8_t *buf, int nb_sectors);
 199 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 200                const uint8_t *buf, int nb_sectors);
 201 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 202                int nb_sectors, BdrvRequestFlags flags);
 203 int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov);
 204 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 205                void *buf, int count);
 206 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 207                 const void *buf, int count);
 208 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 209 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 210     const void *buf, int count);
 211 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 212     int nb_sectors, QEMUIOVector *qiov);
 213 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 214     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 215 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 216     int nb_sectors, QEMUIOVector *qiov);
 217 /*
 218  * Efficiently zero a region of the disk image.  Note that this is a regular
 219  * I/O request like read or write and should have a reasonable size.  This
 220  * function is not suitable for zeroing the entire image in a single request
 221  * because it may allocate memory for the entire region.
 222  */
 223 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 224     int nb_sectors, BdrvRequestFlags flags);
 225 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 226     const char *backing_file);
 227 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 228 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 229 int64_t bdrv_getlength(BlockDriverState *bs);
 230 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 231 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 232 int bdrv_commit(BlockDriverState *bs);
 233 int bdrv_commit_all(void);
 234 int bdrv_change_backing_file(BlockDriverState *bs,
 235     const char *backing_file, const char *backing_fmt);
 236 void bdrv_register(BlockDriver *bdrv);
 237 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 238                            BlockDriverState *base);
 239 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 240                                     BlockDriverState *bs);
 241 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 242
 243
 244 typedef struct BdrvCheckResult {
 245     int corruptions;
 246     int leaks;
 247     int check_errors;
 248     int corruptions_fixed;
 249     int leaks_fixed;
 250     int64_t image_end_offset;
 251     BlockFragInfo bfi;
 252 } BdrvCheckResult;
 253
 254 typedef enum {
 255     BDRV_FIX_LEAKS    = 1,
 256     BDRV_FIX_ERRORS   = 2,
 257 } BdrvCheckMode;
 258
 259 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 260
 261 int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);
 262
 263 /* external snapshots */
 264
 265 typedef enum {
 266     EXT_SNAPSHOT_ALLOWED,
 267     EXT_SNAPSHOT_FORBIDDEN,
 268 } ExtSnapshotPerm;
 269
 270 /* return EXT_SNAPSHOT_ALLOWED if external snapshot is allowed
 271  * return EXT_SNAPSHOT_FORBIDDEN if external snapshot is forbidden
 272  */
 273 ExtSnapshotPerm bdrv_check_ext_snapshot(BlockDriverState *bs);
 274 /* helper used to forbid external snapshots like in blkverify */
 275 ExtSnapshotPerm bdrv_check_ext_snapshot_forbidden(BlockDriverState *bs);
 276
 277 /* async block I/O */
 278 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 279                                      int sector_num);
 280 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 281                                  QEMUIOVector *iov, int nb_sectors,
 282                                  BlockDriverCompletionFunc *cb, void *opaque);
 283 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 284                                   QEMUIOVector *iov, int nb_sectors,
 285                                   BlockDriverCompletionFunc *cb, void *opaque);
 286 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 287                                  BlockDriverCompletionFunc *cb, void *opaque);
 288 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 289                                    int64_t sector_num, int nb_sectors,
 290                                    BlockDriverCompletionFunc *cb, void *opaque);
 291 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 292
 293 typedef struct BlockRequest {
 294     /* Fields to be filled by multiwrite caller */
 295     int64_t sector;
 296     int nb_sectors;
 297     QEMUIOVector *qiov;
 298     BlockDriverCompletionFunc *cb;
 299     void *opaque;
 300
 301     /* Filled by multiwrite implementation */
 302     int error;
 303 } BlockRequest;
 304
 305 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 306     int num_reqs);
 307
 308 /* sg packet commands */
 309 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 310 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 311         unsigned long int req, void *buf,
 312         BlockDriverCompletionFunc *cb, void *opaque);
 313
 314 /* Invalidate any cached metadata used by image formats */
 315 void bdrv_invalidate_cache(BlockDriverState *bs);
 316 void bdrv_invalidate_cache_all(void);
 317
 318 void bdrv_clear_incoming_migration_all(void);
 319
 320 /* Ensure contents are flushed to disk.  */
 321 int bdrv_flush(BlockDriverState *bs);
 322 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 323 int bdrv_flush_all(void);
 324 void bdrv_close_all(void);
 325 void bdrv_drain_all(void);
 326
 327 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 328 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 329 int bdrv_has_zero_init_1(BlockDriverState *bs);
 330 int bdrv_has_zero_init(BlockDriverState *bs);
 331 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 332                               int nb_sectors, int *pnum);
 333 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 334                       int *pnum);
 335 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 336                             int64_t sector_num, int nb_sectors, int *pnum);
 337
 338 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 339                        BlockdevOnError on_write_error);
 340 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 341 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 342 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 343                        bool is_read, int error);
 344 int bdrv_is_read_only(BlockDriverState *bs);
 345 int bdrv_is_sg(BlockDriverState *bs);
 346 int bdrv_enable_write_cache(BlockDriverState *bs);
 347 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 348 int bdrv_is_inserted(BlockDriverState *bs);
 349 int bdrv_media_changed(BlockDriverState *bs);
 350 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 351 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 352 const char *bdrv_get_format_name(BlockDriverState *bs);
 353 BlockDriverState *bdrv_find(const char *name);
 354 BlockDriverState *bdrv_next(BlockDriverState *bs);
 355 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 356                   void *opaque);
 357 int bdrv_is_encrypted(BlockDriverState *bs);
 358 int bdrv_key_required(BlockDriverState *bs);
 359 int bdrv_set_key(BlockDriverState *bs, const char *key);
 360 int bdrv_query_missing_keys(void);
 361 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 362                          void *opaque);
 363 const char *bdrv_get_device_name(BlockDriverState *bs);
 364 int bdrv_get_flags(BlockDriverState *bs);
 365 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 366                           const uint8_t *buf, int nb_sectors);
 367 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 368 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 369 void bdrv_round_to_clusters(BlockDriverState *bs,
 370                             int64_t sector_num, int nb_sectors,
 371                             int64_t *cluster_sector_num,
 372                             int *cluster_nb_sectors);
 373
 374 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 375 void bdrv_get_backing_filename(BlockDriverState *bs,
 376                                char *filename, int filename_size);
 377 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 378                                     char *dest, size_t sz);
 379 int bdrv_is_snapshot(BlockDriverState *bs);
 380
 381 int path_is_absolute(const char *path);
 382 void path_combine(char *dest, int dest_size,
 383                   const char *base_path,
 384                   const char *filename);
 385
 386 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 387 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 388                       int64_t pos, int size);
 389
 390 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 391                       int64_t pos, int size);
 392
 393 void bdrv_img_create(const char *filename, const char *fmt,
 394                      const char *base_filename, const char *base_fmt,
 395                      char *options, uint64_t img_size, int flags,
 396                      Error **errp, bool quiet);
 397
 398 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
 399 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 400 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 401
 402 struct HBitmapIter;
 403 void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity);
 404 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 405 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 406 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 407 void bdrv_dirty_iter_init(BlockDriverState *bs, struct HBitmapIter *hbi);
 408 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 409
 410 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 411 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 412
 413 void bdrv_ref(BlockDriverState *bs);
 414 void bdrv_unref(BlockDriverState *bs);
 415 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 416 int bdrv_in_use(BlockDriverState *bs);
 417
 418 #ifdef CONFIG_LINUX_AIO
 419 int raw_get_aio_fd(BlockDriverState *bs);
 420 #else
 421 static inline int raw_get_aio_fd(BlockDriverState *bs)
 422 {
 423     return -ENOTSUP;
 424 }
 425 #endif
 426
 427 enum BlockAcctType {
 428     BDRV_ACCT_READ,
 429     BDRV_ACCT_WRITE,
 430     BDRV_ACCT_FLUSH,
 431     BDRV_MAX_IOTYPE,
 432 };
 433
 434 typedef struct BlockAcctCookie {
 435     int64_t bytes;
 436     int64_t start_time_ns;
 437     enum BlockAcctType type;
 438 } BlockAcctCookie;
 439
 440 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 441         int64_t bytes, enum BlockAcctType type);
 442 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 443
 444 typedef enum {
 445     BLKDBG_L1_UPDATE,
 446
 447     BLKDBG_L1_GROW_ALLOC_TABLE,
 448     BLKDBG_L1_GROW_WRITE_TABLE,
 449     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 450
 451     BLKDBG_L2_LOAD,
 452     BLKDBG_L2_UPDATE,
 453     BLKDBG_L2_UPDATE_COMPRESSED,
 454     BLKDBG_L2_ALLOC_COW_READ,
 455     BLKDBG_L2_ALLOC_WRITE,
 456
 457     BLKDBG_READ_AIO,
 458     BLKDBG_READ_BACKING_AIO,
 459     BLKDBG_READ_COMPRESSED,
 460
 461     BLKDBG_WRITE_AIO,
 462     BLKDBG_WRITE_COMPRESSED,
 463
 464     BLKDBG_VMSTATE_LOAD,
 465     BLKDBG_VMSTATE_SAVE,
 466
 467     BLKDBG_COW_READ,
 468     BLKDBG_COW_WRITE,
 469
 470     BLKDBG_REFTABLE_LOAD,
 471     BLKDBG_REFTABLE_GROW,
 472     BLKDBG_REFTABLE_UPDATE,
 473
 474     BLKDBG_REFBLOCK_LOAD,
 475     BLKDBG_REFBLOCK_UPDATE,
 476     BLKDBG_REFBLOCK_UPDATE_PART,
 477     BLKDBG_REFBLOCK_ALLOC,
 478     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 479     BLKDBG_REFBLOCK_ALLOC_WRITE,
 480     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 481     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 482     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 483
 484     BLKDBG_CLUSTER_ALLOC,
 485     BLKDBG_CLUSTER_ALLOC_BYTES,
 486     BLKDBG_CLUSTER_FREE,
 487
 488     BLKDBG_FLUSH_TO_OS,
 489     BLKDBG_FLUSH_TO_DISK,
 490
 491     BLKDBG_EVENT_MAX,
 492 } BlkDebugEvent;
 493
 494 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 495 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 496
 497 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 498                            const char *tag);
 499 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 500 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 501
 502 #endif