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