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
 106 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
 107
 108 #define BDRV_SECTOR_BITS   9
 109 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
 110 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
 111
 112 /* BDRV_BLOCK_DATA: data is read from bs->file or another file
 113  * BDRV_BLOCK_ZERO: sectors read as zero
 114  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
 115  * BDRV_BLOCK_RAW: used internally to indicate that the request
 116  *                 was answered by the raw driver and that one
 117  *                 should look in bs->file directly.
 118  *
 119  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
 120  * bs->file where sector data can be read from as raw data.
 121  *
 122  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
 123  *
 124  * DATA ZERO OFFSET_VALID
 125  *  t    t        t       sectors read as zero, bs->file is zero at offset
 126  *  t    f        t       sectors read as valid from bs->file at offset
 127  *  f    t        t       sectors preallocated, read as zero, bs->file not
 128  *                        necessarily zero at offset
 129  *  f    f        t       sectors preallocated but read from backing_hd,
 130  *                        bs->file contains garbage at offset
 131  *  t    t        f       sectors preallocated, read as zero, unknown offset
 132  *  t    f        f       sectors read from unknown file or offset
 133  *  f    t        f       not allocated or unknown offset, read as zero
 134  *  f    f        f       not allocated or unknown offset, read from backing_hd
 135  */
 136 #define BDRV_BLOCK_DATA         1
 137 #define BDRV_BLOCK_ZERO         2
 138 #define BDRV_BLOCK_OFFSET_VALID 4
 139 #define BDRV_BLOCK_RAW          8
 140 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 141
 142 typedef enum {
 143     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
 144 } BlockErrorAction;
 145
 146 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 147
 148 typedef struct BDRVReopenState {
 149     BlockDriverState *bs;
 150     int flags;
 151     void *opaque;
 152 } BDRVReopenState;
 153
 154
 155 void bdrv_iostatus_enable(BlockDriverState *bs);
 156 void bdrv_iostatus_reset(BlockDriverState *bs);
 157 void bdrv_iostatus_disable(BlockDriverState *bs);
 158 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 159 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 160 void bdrv_info_print(Monitor *mon, const QObject *data);
 161 void bdrv_info(Monitor *mon, QObject **ret_data);
 162 void bdrv_stats_print(Monitor *mon, const QObject *data);
 163 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 164
 165 /* disk I/O throttling */
 166 void bdrv_io_limits_enable(BlockDriverState *bs);
 167 void bdrv_io_limits_disable(BlockDriverState *bs);
 168
 169 void bdrv_init(void);
 170 void bdrv_init_with_whitelist(void);
 171 BlockDriver *bdrv_find_protocol(const char *filename,
 172                                 bool allow_protocol_prefix);
 173 BlockDriver *bdrv_find_format(const char *format_name);
 174 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
 175                                           bool readonly);
 176 int bdrv_create(BlockDriver *drv, const char* filename,
 177     QEMUOptionParameter *options, Error **errp);
 178 int bdrv_create_file(const char* filename, QEMUOptionParameter *options,
 179                      Error **errp);
 180 BlockDriverState *bdrv_new(const char *device_name);
 181 void bdrv_make_anon(BlockDriverState *bs);
 182 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 183 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 184 int bdrv_parse_cache_flags(const char *mode, int *flags);
 185 int bdrv_parse_discard_flags(const char *mode, int *flags);
 186 int bdrv_file_open(BlockDriverState **pbs, const char *filename,
 187                    QDict *options, int flags, Error **errp);
 188 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 189 int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
 190               int flags, BlockDriver *drv, Error **errp);
 191 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 192                                     BlockDriverState *bs, int flags);
 193 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 194 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 195 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 196                         BlockReopenQueue *queue, Error **errp);
 197 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 198 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 199 void bdrv_close(BlockDriverState *bs);
 200 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 201 int bdrv_attach_dev(BlockDriverState *bs, void *dev);
 202 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
 203 void bdrv_detach_dev(BlockDriverState *bs, void *dev);
 204 void *bdrv_get_attached_dev(BlockDriverState *bs);
 205 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
 206                       void *opaque);
 207 void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
 208 bool bdrv_dev_has_removable_media(BlockDriverState *bs);
 209 bool bdrv_dev_is_tray_open(BlockDriverState *bs);
 210 bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
 211 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 212               uint8_t *buf, int nb_sectors);
 213 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 214                           uint8_t *buf, int nb_sectors);
 215 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 216                const uint8_t *buf, int nb_sectors);
 217 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 218                int nb_sectors, BdrvRequestFlags flags);
 219 BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 220                                         int nb_sectors, BdrvRequestFlags flags,
 221                                         BlockDriverCompletionFunc *cb, void *opaque);
 222 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 223 int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov);
 224 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 225                void *buf, int count);
 226 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 227                 const void *buf, int count);
 228 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 229 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 230     const void *buf, int count);
 231 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 232     int nb_sectors, QEMUIOVector *qiov);
 233 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 234     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 235 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 236     int nb_sectors, QEMUIOVector *qiov);
 237 /*
 238  * Efficiently zero a region of the disk image.  Note that this is a regular
 239  * I/O request like read or write and should have a reasonable size.  This
 240  * function is not suitable for zeroing the entire image in a single request
 241  * because it may allocate memory for the entire region.
 242  */
 243 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 244     int nb_sectors, BdrvRequestFlags flags);
 245 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 246     const char *backing_file);
 247 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 248 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 249 int64_t bdrv_getlength(BlockDriverState *bs);
 250 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 251 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 252 int bdrv_commit(BlockDriverState *bs);
 253 int bdrv_commit_all(void);
 254 int bdrv_change_backing_file(BlockDriverState *bs,
 255     const char *backing_file, const char *backing_fmt);
 256 void bdrv_register(BlockDriver *bdrv);
 257 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 258                            BlockDriverState *base);
 259 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 260                                     BlockDriverState *bs);
 261 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 262
 263
 264 typedef struct BdrvCheckResult {
 265     int corruptions;
 266     int leaks;
 267     int check_errors;
 268     int corruptions_fixed;
 269     int leaks_fixed;
 270     int64_t image_end_offset;
 271     BlockFragInfo bfi;
 272 } BdrvCheckResult;
 273
 274 typedef enum {
 275     BDRV_FIX_LEAKS    = 1,
 276     BDRV_FIX_ERRORS   = 2,
 277 } BdrvCheckMode;
 278
 279 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 280
 281 int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);
 282
 283 /* external snapshots */
 284
 285 typedef enum {
 286     EXT_SNAPSHOT_ALLOWED,
 287     EXT_SNAPSHOT_FORBIDDEN,
 288 } ExtSnapshotPerm;
 289
 290 /* return EXT_SNAPSHOT_ALLOWED if external snapshot is allowed
 291  * return EXT_SNAPSHOT_FORBIDDEN if external snapshot is forbidden
 292  */
 293 ExtSnapshotPerm bdrv_check_ext_snapshot(BlockDriverState *bs);
 294 /* helper used to forbid external snapshots like in blkverify */
 295 ExtSnapshotPerm bdrv_check_ext_snapshot_forbidden(BlockDriverState *bs);
 296
 297 /* async block I/O */
 298 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 299                                      int sector_num);
 300 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 301                                  QEMUIOVector *iov, int nb_sectors,
 302                                  BlockDriverCompletionFunc *cb, void *opaque);
 303 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 304                                   QEMUIOVector *iov, int nb_sectors,
 305                                   BlockDriverCompletionFunc *cb, void *opaque);
 306 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 307                                  BlockDriverCompletionFunc *cb, void *opaque);
 308 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 309                                    int64_t sector_num, int nb_sectors,
 310                                    BlockDriverCompletionFunc *cb, void *opaque);
 311 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 312
 313 typedef struct BlockRequest {
 314     /* Fields to be filled by multiwrite caller */
 315     int64_t sector;
 316     int nb_sectors;
 317     int flags;
 318     QEMUIOVector *qiov;
 319     BlockDriverCompletionFunc *cb;
 320     void *opaque;
 321
 322     /* Filled by multiwrite implementation */
 323     int error;
 324 } BlockRequest;
 325
 326 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 327     int num_reqs);
 328
 329 /* sg packet commands */
 330 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 331 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 332         unsigned long int req, void *buf,
 333         BlockDriverCompletionFunc *cb, void *opaque);
 334
 335 /* Invalidate any cached metadata used by image formats */
 336 void bdrv_invalidate_cache(BlockDriverState *bs);
 337 void bdrv_invalidate_cache_all(void);
 338
 339 void bdrv_clear_incoming_migration_all(void);
 340
 341 /* Ensure contents are flushed to disk.  */
 342 int bdrv_flush(BlockDriverState *bs);
 343 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 344 int bdrv_flush_all(void);
 345 void bdrv_close_all(void);
 346 void bdrv_drain_all(void);
 347
 348 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 349 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 350 int bdrv_has_zero_init_1(BlockDriverState *bs);
 351 int bdrv_has_zero_init(BlockDriverState *bs);
 352 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
 353 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 354 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 355                               int nb_sectors, int *pnum);
 356 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 357                       int *pnum);
 358 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 359                             int64_t sector_num, int nb_sectors, int *pnum);
 360
 361 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 362                        BlockdevOnError on_write_error);
 363 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 364 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 365 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 366                        bool is_read, int error);
 367 int bdrv_is_read_only(BlockDriverState *bs);
 368 int bdrv_is_sg(BlockDriverState *bs);
 369 int bdrv_enable_write_cache(BlockDriverState *bs);
 370 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 371 int bdrv_is_inserted(BlockDriverState *bs);
 372 int bdrv_media_changed(BlockDriverState *bs);
 373 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 374 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 375 const char *bdrv_get_format_name(BlockDriverState *bs);
 376 BlockDriverState *bdrv_find(const char *name);
 377 BlockDriverState *bdrv_next(BlockDriverState *bs);
 378 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 379                   void *opaque);
 380 int bdrv_is_encrypted(BlockDriverState *bs);
 381 int bdrv_key_required(BlockDriverState *bs);
 382 int bdrv_set_key(BlockDriverState *bs, const char *key);
 383 int bdrv_query_missing_keys(void);
 384 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 385                          void *opaque);
 386 const char *bdrv_get_device_name(BlockDriverState *bs);
 387 int bdrv_get_flags(BlockDriverState *bs);
 388 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 389                           const uint8_t *buf, int nb_sectors);
 390 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 391 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 392 void bdrv_round_to_clusters(BlockDriverState *bs,
 393                             int64_t sector_num, int nb_sectors,
 394                             int64_t *cluster_sector_num,
 395                             int *cluster_nb_sectors);
 396
 397 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 398 void bdrv_get_backing_filename(BlockDriverState *bs,
 399                                char *filename, int filename_size);
 400 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 401                                     char *dest, size_t sz);
 402 int bdrv_is_snapshot(BlockDriverState *bs);
 403
 404 int path_is_absolute(const char *path);
 405 void path_combine(char *dest, int dest_size,
 406                   const char *base_path,
 407                   const char *filename);
 408
 409 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 410 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 411                       int64_t pos, int size);
 412
 413 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 414                       int64_t pos, int size);
 415
 416 void bdrv_img_create(const char *filename, const char *fmt,
 417                      const char *base_filename, const char *base_fmt,
 418                      char *options, uint64_t img_size, int flags,
 419                      Error **errp, bool quiet);
 420
 421 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
 422 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 423 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 424
 425 struct HBitmapIter;
 426 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
 427 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity);
 428 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 429 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 430 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 431 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 432 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 433 void bdrv_dirty_iter_init(BlockDriverState *bs,
 434                           BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
 435 int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 436
 437 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 438 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 439
 440 void bdrv_ref(BlockDriverState *bs);
 441 void bdrv_unref(BlockDriverState *bs);
 442 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 443 int bdrv_in_use(BlockDriverState *bs);
 444
 445 #ifdef CONFIG_LINUX_AIO
 446 int raw_get_aio_fd(BlockDriverState *bs);
 447 #else
 448 static inline int raw_get_aio_fd(BlockDriverState *bs)
 449 {
 450     return -ENOTSUP;
 451 }
 452 #endif
 453
 454 enum BlockAcctType {
 455     BDRV_ACCT_READ,
 456     BDRV_ACCT_WRITE,
 457     BDRV_ACCT_FLUSH,
 458     BDRV_MAX_IOTYPE,
 459 };
 460
 461 typedef struct BlockAcctCookie {
 462     int64_t bytes;
 463     int64_t start_time_ns;
 464     enum BlockAcctType type;
 465 } BlockAcctCookie;
 466
 467 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 468         int64_t bytes, enum BlockAcctType type);
 469 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 470
 471 typedef enum {
 472     BLKDBG_L1_UPDATE,
 473
 474     BLKDBG_L1_GROW_ALLOC_TABLE,
 475     BLKDBG_L1_GROW_WRITE_TABLE,
 476     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 477
 478     BLKDBG_L2_LOAD,
 479     BLKDBG_L2_UPDATE,
 480     BLKDBG_L2_UPDATE_COMPRESSED,
 481     BLKDBG_L2_ALLOC_COW_READ,
 482     BLKDBG_L2_ALLOC_WRITE,
 483
 484     BLKDBG_READ_AIO,
 485     BLKDBG_READ_BACKING_AIO,
 486     BLKDBG_READ_COMPRESSED,
 487
 488     BLKDBG_WRITE_AIO,
 489     BLKDBG_WRITE_COMPRESSED,
 490
 491     BLKDBG_VMSTATE_LOAD,
 492     BLKDBG_VMSTATE_SAVE,
 493
 494     BLKDBG_COW_READ,
 495     BLKDBG_COW_WRITE,
 496
 497     BLKDBG_REFTABLE_LOAD,
 498     BLKDBG_REFTABLE_GROW,
 499     BLKDBG_REFTABLE_UPDATE,
 500
 501     BLKDBG_REFBLOCK_LOAD,
 502     BLKDBG_REFBLOCK_UPDATE,
 503     BLKDBG_REFBLOCK_UPDATE_PART,
 504     BLKDBG_REFBLOCK_ALLOC,
 505     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 506     BLKDBG_REFBLOCK_ALLOC_WRITE,
 507     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 508     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 509     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 510
 511     BLKDBG_CLUSTER_ALLOC,
 512     BLKDBG_CLUSTER_ALLOC_BYTES,
 513     BLKDBG_CLUSTER_FREE,
 514
 515     BLKDBG_FLUSH_TO_OS,
 516     BLKDBG_FLUSH_TO_DISK,
 517
 518     BLKDBG_EVENT_MAX,
 519 } BlkDebugEvent;
 520
 521 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 522 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 523
 524 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 525                            const char *tag);
 526 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 527 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 528 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 529
 530 #endif