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     /*
  22      * True if unallocated blocks read back as zeroes. This is equivalent
  23      * to the the LBPRZ flag in the SCSI logical block provisioning page.
  24      */
  25     bool unallocated_blocks_are_zero;
  26     /*
  27      * True if the driver can optimize writing zeroes by unmapping
  28      * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
  29      * with the difference that in qemu a discard is allowed to silently
  30      * fail. Therefore we have to use bdrv_write_zeroes with the
  31      * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
  32      * After this call the driver has to guarantee that the contents read
  33      * back as zero. It is additionally required that the block device is
  34      * opened with BDRV_O_UNMAP flag for this to work.
  35      */
  36     bool can_write_zeroes_with_unmap;
  37 } BlockDriverInfo;
  38
  39 typedef struct BlockFragInfo {
  40     uint64_t allocated_clusters;
  41     uint64_t total_clusters;
  42     uint64_t fragmented_clusters;
  43     uint64_t compressed_clusters;
  44 } BlockFragInfo;
  45
  46 /* Callbacks for block device models */
  47 typedef struct BlockDevOps {
  48     /*
  49      * Runs when virtual media changed (monitor commands eject, change)
  50      * Argument load is true on load and false on eject.
  51      * Beware: doesn't run when a host device's physical media
  52      * changes.  Sure would be useful if it did.
  53      * Device models with removable media must implement this callback.
  54      */
  55     void (*change_media_cb)(void *opaque, bool load);
  56     /*
  57      * Runs when an eject request is issued from the monitor, the tray
  58      * is closed, and the medium is locked.
  59      * Device models that do not implement is_medium_locked will not need
  60      * this callback.  Device models that can lock the medium or tray might
  61      * want to implement the callback and unlock the tray when "force" is
  62      * true, even if they do not support eject requests.
  63      */
  64     void (*eject_request_cb)(void *opaque, bool force);
  65     /*
  66      * Is the virtual tray open?
  67      * Device models implement this only when the device has a tray.
  68      */
  69     bool (*is_tray_open)(void *opaque);
  70     /*
  71      * Is the virtual medium locked into the device?
  72      * Device models implement this only when device has such a lock.
  73      */
  74     bool (*is_medium_locked)(void *opaque);
  75     /*
  76      * Runs when the size changed (e.g. monitor command block_resize)
  77      */
  78     void (*resize_cb)(void *opaque);
  79 } BlockDevOps;
  80
  81 typedef enum {
  82     BDRV_REQ_COPY_ON_READ = 0x1,
  83     BDRV_REQ_ZERO_WRITE   = 0x2,
  84     /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
  85      * is allowed to optimize a write zeroes request by unmapping (discarding)
  86      * blocks if it is guaranteed that the result will read back as
  87      * zeroes. The flag is only passed to the driver if the block device is
  88      * opened with BDRV_O_UNMAP.
  89      */
  90     BDRV_REQ_MAY_UNMAP    = 0x4,
  91 } BdrvRequestFlags;
  92
  93 #define BDRV_O_RDWR        0x0002
  94 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  95 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  96 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  97 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  98 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  99 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
 100 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
 101 #define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
 102 #define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
 103 #define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
 104 #define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */
 105 #define BDRV_O_PROTOCOL    0x8000  /* if no block driver is explicitly given:
 106                                       select an appropriate protocol driver,
 107                                       ignoring the format layer */
 108
 109 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
 110
 111 #define BDRV_SECTOR_BITS   9
 112 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
 113 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
 114
 115 /* BDRV_BLOCK_DATA: data is read from bs->file or another file
 116  * BDRV_BLOCK_ZERO: sectors read as zero
 117  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
 118  * BDRV_BLOCK_RAW: used internally to indicate that the request
 119  *                 was answered by the raw driver and that one
 120  *                 should look in bs->file directly.
 121  *
 122  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
 123  * bs->file where sector data can be read from as raw data.
 124  *
 125  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
 126  *
 127  * DATA ZERO OFFSET_VALID
 128  *  t    t        t       sectors read as zero, bs->file is zero at offset
 129  *  t    f        t       sectors read as valid from bs->file at offset
 130  *  f    t        t       sectors preallocated, read as zero, bs->file not
 131  *                        necessarily zero at offset
 132  *  f    f        t       sectors preallocated but read from backing_hd,
 133  *                        bs->file contains garbage at offset
 134  *  t    t        f       sectors preallocated, read as zero, unknown offset
 135  *  t    f        f       sectors read from unknown file or offset
 136  *  f    t        f       not allocated or unknown offset, read as zero
 137  *  f    f        f       not allocated or unknown offset, read from backing_hd
 138  */
 139 #define BDRV_BLOCK_DATA         1
 140 #define BDRV_BLOCK_ZERO         2
 141 #define BDRV_BLOCK_OFFSET_VALID 4
 142 #define BDRV_BLOCK_RAW          8
 143 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 144
 145 typedef enum {
 146     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
 147 } BlockErrorAction;
 148
 149 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 150
 151 typedef struct BDRVReopenState {
 152     BlockDriverState *bs;
 153     int flags;
 154     void *opaque;
 155 } BDRVReopenState;
 156
 157
 158 void bdrv_iostatus_enable(BlockDriverState *bs);
 159 void bdrv_iostatus_reset(BlockDriverState *bs);
 160 void bdrv_iostatus_disable(BlockDriverState *bs);
 161 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 162 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 163 void bdrv_info_print(Monitor *mon, const QObject *data);
 164 void bdrv_info(Monitor *mon, QObject **ret_data);
 165 void bdrv_stats_print(Monitor *mon, const QObject *data);
 166 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 167
 168 /* disk I/O throttling */
 169 void bdrv_io_limits_enable(BlockDriverState *bs);
 170 void bdrv_io_limits_disable(BlockDriverState *bs);
 171
 172 void bdrv_init(void);
 173 void bdrv_init_with_whitelist(void);
 174 BlockDriver *bdrv_find_protocol(const char *filename,
 175                                 bool allow_protocol_prefix);
 176 BlockDriver *bdrv_find_format(const char *format_name);
 177 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
 178                                           bool readonly);
 179 int bdrv_create(BlockDriver *drv, const char* filename,
 180     QEMUOptionParameter *options, Error **errp);
 181 int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
 182                      Error **errp);
 183 BlockDriverState *bdrv_new(const char *device_name);
 184 void bdrv_make_anon(BlockDriverState *bs);
 185 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 186 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 187 int bdrv_parse_cache_flags(const char *mode, int *flags);
 188 int bdrv_parse_discard_flags(const char *mode, int *flags);
 189 int bdrv_open_image(BlockDriverState **pbs, const char *filename,
 190                     QDict *options, const char *bdref_key, int flags,
 191                     bool allow_none, Error **errp);
 192 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 193 int bdrv_open(BlockDriverState **pbs, const char *filename,
 194               const char *reference, QDict *options, int flags,
 195               BlockDriver *drv, Error **errp);
 196 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 197                                     BlockDriverState *bs, int flags);
 198 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 199 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 200 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 201                         BlockReopenQueue *queue, Error **errp);
 202 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 203 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 204 void bdrv_close(BlockDriverState *bs);
 205 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 206 int bdrv_attach_dev(BlockDriverState *bs, void *dev);
 207 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
 208 void bdrv_detach_dev(BlockDriverState *bs, void *dev);
 209 void *bdrv_get_attached_dev(BlockDriverState *bs);
 210 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
 211                       void *opaque);
 212 void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
 213 bool bdrv_dev_has_removable_media(BlockDriverState *bs);
 214 bool bdrv_dev_is_tray_open(BlockDriverState *bs);
 215 bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
 216 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 217               uint8_t *buf, int nb_sectors);
 218 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 219                           uint8_t *buf, int nb_sectors);
 220 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 221                const uint8_t *buf, int nb_sectors);
 222 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 223                int nb_sectors, BdrvRequestFlags flags);
 224 BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 225                                         int nb_sectors, BdrvRequestFlags flags,
 226                                         BlockDriverCompletionFunc *cb, void *opaque);
 227 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 228 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 229                void *buf, int count);
 230 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 231                 const void *buf, int count);
 232 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 233 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 234     const void *buf, int count);
 235 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 236     int nb_sectors, QEMUIOVector *qiov);
 237 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 238     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 239 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 240     int nb_sectors, QEMUIOVector *qiov);
 241 /*
 242  * Efficiently zero a region of the disk image.  Note that this is a regular
 243  * I/O request like read or write and should have a reasonable size.  This
 244  * function is not suitable for zeroing the entire image in a single request
 245  * because it may allocate memory for the entire region.
 246  */
 247 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 248     int nb_sectors, BdrvRequestFlags flags);
 249 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 250     const char *backing_file);
 251 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 252 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 253 int64_t bdrv_getlength(BlockDriverState *bs);
 254 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 255 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 256 int bdrv_refresh_limits(BlockDriverState *bs);
 257 int bdrv_commit(BlockDriverState *bs);
 258 int bdrv_commit_all(void);
 259 int bdrv_change_backing_file(BlockDriverState *bs,
 260     const char *backing_file, const char *backing_fmt);
 261 void bdrv_register(BlockDriver *bdrv);
 262 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 263                            BlockDriverState *base);
 264 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 265                                     BlockDriverState *bs);
 266 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 267
 268
 269 typedef struct BdrvCheckResult {
 270     int corruptions;
 271     int leaks;
 272     int check_errors;
 273     int corruptions_fixed;
 274     int leaks_fixed;
 275     int64_t image_end_offset;
 276     BlockFragInfo bfi;
 277 } BdrvCheckResult;
 278
 279 typedef enum {
 280     BDRV_FIX_LEAKS    = 1,
 281     BDRV_FIX_ERRORS   = 2,
 282 } BdrvCheckMode;
 283
 284 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 285
 286 int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);
 287
 288 /* external snapshots */
 289 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
 290                                       BlockDriverState *candidate);
 291 bool bdrv_is_first_non_filter(BlockDriverState *candidate);
 292
 293 /* async block I/O */
 294 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 295                                      int sector_num);
 296 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 297                                  QEMUIOVector *iov, int nb_sectors,
 298                                  BlockDriverCompletionFunc *cb, void *opaque);
 299 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 300                                   QEMUIOVector *iov, int nb_sectors,
 301                                   BlockDriverCompletionFunc *cb, void *opaque);
 302 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 303                                  BlockDriverCompletionFunc *cb, void *opaque);
 304 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 305                                    int64_t sector_num, int nb_sectors,
 306                                    BlockDriverCompletionFunc *cb, void *opaque);
 307 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 308
 309 typedef struct BlockRequest {
 310     /* Fields to be filled by multiwrite caller */
 311     int64_t sector;
 312     int nb_sectors;
 313     int flags;
 314     QEMUIOVector *qiov;
 315     BlockDriverCompletionFunc *cb;
 316     void *opaque;
 317
 318     /* Filled by multiwrite implementation */
 319     int error;
 320 } BlockRequest;
 321
 322 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 323     int num_reqs);
 324
 325 /* sg packet commands */
 326 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 327 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 328         unsigned long int req, void *buf,
 329         BlockDriverCompletionFunc *cb, void *opaque);
 330
 331 /* Invalidate any cached metadata used by image formats */
 332 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
 333 void bdrv_invalidate_cache_all(Error **errp);
 334
 335 void bdrv_clear_incoming_migration_all(void);
 336
 337 /* Ensure contents are flushed to disk.  */
 338 int bdrv_flush(BlockDriverState *bs);
 339 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 340 int bdrv_flush_all(void);
 341 void bdrv_close_all(void);
 342 void bdrv_drain_all(void);
 343
 344 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 345 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 346 int bdrv_has_zero_init_1(BlockDriverState *bs);
 347 int bdrv_has_zero_init(BlockDriverState *bs);
 348 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
 349 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 350 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 351                               int nb_sectors, int *pnum);
 352 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 353                       int *pnum);
 354 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 355                             int64_t sector_num, int nb_sectors, int *pnum);
 356
 357 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 358                        BlockdevOnError on_write_error);
 359 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 360 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 361 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 362                        bool is_read, int error);
 363 int bdrv_is_read_only(BlockDriverState *bs);
 364 int bdrv_is_sg(BlockDriverState *bs);
 365 int bdrv_enable_write_cache(BlockDriverState *bs);
 366 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 367 int bdrv_is_inserted(BlockDriverState *bs);
 368 int bdrv_media_changed(BlockDriverState *bs);
 369 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 370 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 371 const char *bdrv_get_format_name(BlockDriverState *bs);
 372 BlockDriverState *bdrv_find(const char *name);
 373 BlockDriverState *bdrv_find_node(const char *node_name);
 374 BlockDeviceInfoList *bdrv_named_nodes_list(void);
 375 BlockDriverState *bdrv_lookup_bs(const char *device,
 376                                  const char *node_name,
 377                                  Error **errp);
 378 BlockDriverState *bdrv_next(BlockDriverState *bs);
 379 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 380                   void *opaque);
 381 int bdrv_is_encrypted(BlockDriverState *bs);
 382 int bdrv_key_required(BlockDriverState *bs);
 383 int bdrv_set_key(BlockDriverState *bs, const char *key);
 384 int bdrv_query_missing_keys(void);
 385 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 386                          void *opaque);
 387 const char *bdrv_get_device_name(BlockDriverState *bs);
 388 int bdrv_get_flags(BlockDriverState *bs);
 389 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 390                           const uint8_t *buf, int nb_sectors);
 391 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 392 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 393 void bdrv_round_to_clusters(BlockDriverState *bs,
 394                             int64_t sector_num, int nb_sectors,
 395                             int64_t *cluster_sector_num,
 396                             int *cluster_nb_sectors);
 397
 398 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 399 void bdrv_get_backing_filename(BlockDriverState *bs,
 400                                char *filename, int filename_size);
 401 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 402                                     char *dest, size_t sz);
 403 int bdrv_is_snapshot(BlockDriverState *bs);
 404
 405 int path_is_absolute(const char *path);
 406 void path_combine(char *dest, int dest_size,
 407                   const char *base_path,
 408                   const char *filename);
 409
 410 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 411 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 412                       int64_t pos, int size);
 413
 414 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 415                       int64_t pos, int size);
 416
 417 void bdrv_img_create(const char *filename, const char *fmt,
 418                      const char *base_filename, const char *base_fmt,
 419                      char *options, uint64_t img_size, int flags,
 420                      Error **errp, bool quiet);
 421
 422 /* Returns the alignment in bytes that is required so that no bounce buffer
 423  * is required throughout the stack */
 424 size_t bdrv_opt_mem_align(BlockDriverState *bs);
 425 void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
 426 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 427 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 428
 429 struct HBitmapIter;
 430 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
 431 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity);
 432 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 433 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 434 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 435 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 436 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 437 void bdrv_dirty_iter_init(BlockDriverState *bs,
 438                           BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
 439 int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 440
 441 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 442 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 443
 444 void bdrv_ref(BlockDriverState *bs);
 445 void bdrv_unref(BlockDriverState *bs);
 446 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 447 int bdrv_in_use(BlockDriverState *bs);
 448
 449 #ifdef CONFIG_LINUX_AIO
 450 int raw_get_aio_fd(BlockDriverState *bs);
 451 #else
 452 static inline int raw_get_aio_fd(BlockDriverState *bs)
 453 {
 454     return -ENOTSUP;
 455 }
 456 #endif
 457
 458 enum BlockAcctType {
 459     BDRV_ACCT_READ,
 460     BDRV_ACCT_WRITE,
 461     BDRV_ACCT_FLUSH,
 462     BDRV_MAX_IOTYPE,
 463 };
 464
 465 typedef struct BlockAcctCookie {
 466     int64_t bytes;
 467     int64_t start_time_ns;
 468     enum BlockAcctType type;
 469 } BlockAcctCookie;
 470
 471 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 472         int64_t bytes, enum BlockAcctType type);
 473 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 474
 475 typedef enum {
 476     BLKDBG_L1_UPDATE,
 477
 478     BLKDBG_L1_GROW_ALLOC_TABLE,
 479     BLKDBG_L1_GROW_WRITE_TABLE,
 480     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 481
 482     BLKDBG_L2_LOAD,
 483     BLKDBG_L2_UPDATE,
 484     BLKDBG_L2_UPDATE_COMPRESSED,
 485     BLKDBG_L2_ALLOC_COW_READ,
 486     BLKDBG_L2_ALLOC_WRITE,
 487
 488     BLKDBG_READ_AIO,
 489     BLKDBG_READ_BACKING_AIO,
 490     BLKDBG_READ_COMPRESSED,
 491
 492     BLKDBG_WRITE_AIO,
 493     BLKDBG_WRITE_COMPRESSED,
 494
 495     BLKDBG_VMSTATE_LOAD,
 496     BLKDBG_VMSTATE_SAVE,
 497
 498     BLKDBG_COW_READ,
 499     BLKDBG_COW_WRITE,
 500
 501     BLKDBG_REFTABLE_LOAD,
 502     BLKDBG_REFTABLE_GROW,
 503     BLKDBG_REFTABLE_UPDATE,
 504
 505     BLKDBG_REFBLOCK_LOAD,
 506     BLKDBG_REFBLOCK_UPDATE,
 507     BLKDBG_REFBLOCK_UPDATE_PART,
 508     BLKDBG_REFBLOCK_ALLOC,
 509     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 510     BLKDBG_REFBLOCK_ALLOC_WRITE,
 511     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 512     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 513     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 514
 515     BLKDBG_CLUSTER_ALLOC,
 516     BLKDBG_CLUSTER_ALLOC_BYTES,
 517     BLKDBG_CLUSTER_FREE,
 518
 519     BLKDBG_FLUSH_TO_OS,
 520     BLKDBG_FLUSH_TO_DISK,
 521
 522     BLKDBG_PWRITEV_RMW_HEAD,
 523     BLKDBG_PWRITEV_RMW_AFTER_HEAD,
 524     BLKDBG_PWRITEV_RMW_TAIL,
 525     BLKDBG_PWRITEV_RMW_AFTER_TAIL,
 526     BLKDBG_PWRITEV,
 527     BLKDBG_PWRITEV_ZERO,
 528     BLKDBG_PWRITEV_DONE,
 529
 530     BLKDBG_EVENT_MAX,
 531 } BlkDebugEvent;
 532
 533 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 534 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 535
 536 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 537                            const char *tag);
 538 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 539 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 540 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 541
 542 #endif