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 "block/accounting.h"
   9 #include "qapi/qmp/qobject.h"
  10 #include "qapi-types.h"
  11
  12 /* block.c */
  13 typedef struct BlockDriver BlockDriver;
  14 typedef struct BlockJob BlockJob;
  15
  16 typedef struct BlockDriverInfo {
  17     /* in bytes, 0 if irrelevant */
  18     int cluster_size;
  19     /* offset at which the VM state can be saved (0 if not possible) */
  20     int64_t vm_state_offset;
  21     bool is_dirty;
  22     /*
  23      * True if unallocated blocks read back as zeroes. This is equivalent
  24      * to the the LBPRZ flag in the SCSI logical block provisioning page.
  25      */
  26     bool unallocated_blocks_are_zero;
  27     /*
  28      * True if the driver can optimize writing zeroes by unmapping
  29      * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
  30      * with the difference that in qemu a discard is allowed to silently
  31      * fail. Therefore we have to use bdrv_write_zeroes with the
  32      * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
  33      * After this call the driver has to guarantee that the contents read
  34      * back as zero. It is additionally required that the block device is
  35      * opened with BDRV_O_UNMAP flag for this to work.
  36      */
  37     bool can_write_zeroes_with_unmap;
  38     /*
  39      * True if this block driver only supports compressed writes
  40      */
  41     bool needs_compressed_writes;
  42 } BlockDriverInfo;
  43
  44 typedef struct BlockFragInfo {
  45     uint64_t allocated_clusters;
  46     uint64_t total_clusters;
  47     uint64_t fragmented_clusters;
  48     uint64_t compressed_clusters;
  49 } BlockFragInfo;
  50
  51 typedef enum {
  52     BDRV_REQ_COPY_ON_READ = 0x1,
  53     BDRV_REQ_ZERO_WRITE   = 0x2,
  54     /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
  55      * is allowed to optimize a write zeroes request by unmapping (discarding)
  56      * blocks if it is guaranteed that the result will read back as
  57      * zeroes. The flag is only passed to the driver if the block device is
  58      * opened with BDRV_O_UNMAP.
  59      */
  60     BDRV_REQ_MAY_UNMAP    = 0x4,
  61 } BdrvRequestFlags;
  62
  63 #define BDRV_O_RDWR        0x0002
  64 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  65 #define BDRV_O_TEMPORARY   0x0010 /* delete the file after use */
  66 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  67 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  68 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  69 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  70 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
  71 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
  72 #define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
  73 #define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
  74 #define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
  75 #define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */
  76 #define BDRV_O_PROTOCOL    0x8000  /* if no block driver is explicitly given:
  77                                       select an appropriate protocol driver,
  78                                       ignoring the format layer */
  79
  80 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
  81
  82 #define BDRV_SECTOR_BITS   9
  83 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
  84 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
  85
  86 /* BDRV_BLOCK_DATA: data is read from bs->file or another file
  87  * BDRV_BLOCK_ZERO: sectors read as zero
  88  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
  89  * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
  90  *                       layer (as opposed to the backing file)
  91  * BDRV_BLOCK_RAW: used internally to indicate that the request
  92  *                 was answered by the raw driver and that one
  93  *                 should look in bs->file directly.
  94  *
  95  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
  96  * bs->file where sector data can be read from as raw data.
  97  *
  98  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
  99  *
 100  * DATA ZERO OFFSET_VALID
 101  *  t    t        t       sectors read as zero, bs->file is zero at offset
 102  *  t    f        t       sectors read as valid from bs->file at offset
 103  *  f    t        t       sectors preallocated, read as zero, bs->file not
 104  *                        necessarily zero at offset
 105  *  f    f        t       sectors preallocated but read from backing_hd,
 106  *                        bs->file contains garbage at offset
 107  *  t    t        f       sectors preallocated, read as zero, unknown offset
 108  *  t    f        f       sectors read from unknown file or offset
 109  *  f    t        f       not allocated or unknown offset, read as zero
 110  *  f    f        f       not allocated or unknown offset, read from backing_hd
 111  */
 112 #define BDRV_BLOCK_DATA         0x01
 113 #define BDRV_BLOCK_ZERO         0x02
 114 #define BDRV_BLOCK_OFFSET_VALID 0x04
 115 #define BDRV_BLOCK_RAW          0x08
 116 #define BDRV_BLOCK_ALLOCATED    0x10
 117 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 118
 119 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 120
 121 typedef struct BDRVReopenState {
 122     BlockDriverState *bs;
 123     int flags;
 124     void *opaque;
 125 } BDRVReopenState;
 126
 127 /*
 128  * Block operation types
 129  */
 130 typedef enum BlockOpType {
 131     BLOCK_OP_TYPE_BACKUP_SOURCE,
 132     BLOCK_OP_TYPE_BACKUP_TARGET,
 133     BLOCK_OP_TYPE_CHANGE,
 134     BLOCK_OP_TYPE_COMMIT,
 135     BLOCK_OP_TYPE_DATAPLANE,
 136     BLOCK_OP_TYPE_DRIVE_DEL,
 137     BLOCK_OP_TYPE_EJECT,
 138     BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
 139     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT,
 140     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
 141     BLOCK_OP_TYPE_MIRROR,
 142     BLOCK_OP_TYPE_RESIZE,
 143     BLOCK_OP_TYPE_STREAM,
 144     BLOCK_OP_TYPE_REPLACE,
 145     BLOCK_OP_TYPE_MAX,
 146 } BlockOpType;
 147
 148 void bdrv_iostatus_enable(BlockDriverState *bs);
 149 void bdrv_iostatus_reset(BlockDriverState *bs);
 150 void bdrv_iostatus_disable(BlockDriverState *bs);
 151 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 152 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 153 void bdrv_info_print(Monitor *mon, const QObject *data);
 154 void bdrv_info(Monitor *mon, QObject **ret_data);
 155 void bdrv_stats_print(Monitor *mon, const QObject *data);
 156 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 157
 158 /* disk I/O throttling */
 159 void bdrv_io_limits_enable(BlockDriverState *bs);
 160 void bdrv_io_limits_disable(BlockDriverState *bs);
 161
 162 void bdrv_init(void);
 163 void bdrv_init_with_whitelist(void);
 164 BlockDriver *bdrv_find_protocol(const char *filename,
 165                                 bool allow_protocol_prefix);
 166 BlockDriver *bdrv_find_format(const char *format_name);
 167 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
 168                                           bool readonly);
 169 int bdrv_create(BlockDriver *drv, const char* filename,
 170                 QemuOpts *opts, Error **errp);
 171 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
 172 BlockDriverState *bdrv_new_root(void);
 173 BlockDriverState *bdrv_new(void);
 174 void bdrv_make_anon(BlockDriverState *bs);
 175 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 176 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 177 int bdrv_parse_cache_flags(const char *mode, int *flags);
 178 int bdrv_parse_discard_flags(const char *mode, int *flags);
 179 int bdrv_open_image(BlockDriverState **pbs, const char *filename,
 180                     QDict *options, const char *bdref_key, int flags,
 181                     bool allow_none, Error **errp);
 182 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd);
 183 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 184 int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp);
 185 int bdrv_open(BlockDriverState **pbs, const char *filename,
 186               const char *reference, QDict *options, int flags,
 187               BlockDriver *drv, Error **errp);
 188 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 189                                     BlockDriverState *bs, int flags);
 190 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 191 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 192 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 193                         BlockReopenQueue *queue, Error **errp);
 194 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 195 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 196 void bdrv_close(BlockDriverState *bs);
 197 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 198 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 199               uint8_t *buf, int nb_sectors);
 200 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 201                           uint8_t *buf, int nb_sectors);
 202 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 203                const uint8_t *buf, int nb_sectors);
 204 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 205                int nb_sectors, BdrvRequestFlags flags);
 206 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 207                                   int nb_sectors, BdrvRequestFlags flags,
 208                                   BlockCompletionFunc *cb, void *opaque);
 209 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 210 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 211                void *buf, int count);
 212 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 213                 const void *buf, int count);
 214 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 215 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 216     const void *buf, int count);
 217 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 218     int nb_sectors, QEMUIOVector *qiov);
 219 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 220     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 221 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 222     int nb_sectors, QEMUIOVector *qiov);
 223 /*
 224  * Efficiently zero a region of the disk image.  Note that this is a regular
 225  * I/O request like read or write and should have a reasonable size.  This
 226  * function is not suitable for zeroing the entire image in a single request
 227  * because it may allocate memory for the entire region.
 228  */
 229 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 230     int nb_sectors, BdrvRequestFlags flags);
 231 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 232     const char *backing_file);
 233 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 234 void bdrv_refresh_filename(BlockDriverState *bs);
 235 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 236 int64_t bdrv_nb_sectors(BlockDriverState *bs);
 237 int64_t bdrv_getlength(BlockDriverState *bs);
 238 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 239 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 240 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp);
 241 int bdrv_commit(BlockDriverState *bs);
 242 int bdrv_commit_all(void);
 243 int bdrv_change_backing_file(BlockDriverState *bs,
 244     const char *backing_file, const char *backing_fmt);
 245 void bdrv_register(BlockDriver *bdrv);
 246 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 247                            BlockDriverState *base,
 248                            const char *backing_file_str);
 249 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 250                                     BlockDriverState *bs);
 251 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 252
 253
 254 typedef struct BdrvCheckResult {
 255     int corruptions;
 256     int leaks;
 257     int check_errors;
 258     int corruptions_fixed;
 259     int leaks_fixed;
 260     int64_t image_end_offset;
 261     BlockFragInfo bfi;
 262 } BdrvCheckResult;
 263
 264 typedef enum {
 265     BDRV_FIX_LEAKS    = 1,
 266     BDRV_FIX_ERRORS   = 2,
 267 } BdrvCheckMode;
 268
 269 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 270
 271 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts);
 272
 273 /* external snapshots */
 274 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
 275                                       BlockDriverState *candidate);
 276 bool bdrv_is_first_non_filter(BlockDriverState *candidate);
 277
 278 /* check if a named node can be replaced when doing drive-mirror */
 279 BlockDriverState *check_to_replace_node(const char *node_name, Error **errp);
 280
 281 /* async block I/O */
 282 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 283                                      int sector_num);
 284 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 285                            QEMUIOVector *iov, int nb_sectors,
 286                            BlockCompletionFunc *cb, void *opaque);
 287 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 288                             QEMUIOVector *iov, int nb_sectors,
 289                             BlockCompletionFunc *cb, void *opaque);
 290 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 291                            BlockCompletionFunc *cb, void *opaque);
 292 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 293                              int64_t sector_num, int nb_sectors,
 294                              BlockCompletionFunc *cb, void *opaque);
 295 void bdrv_aio_cancel(BlockAIOCB *acb);
 296 void bdrv_aio_cancel_async(BlockAIOCB *acb);
 297
 298 typedef struct BlockRequest {
 299     /* Fields to be filled by multiwrite caller */
 300     int64_t sector;
 301     int nb_sectors;
 302     int flags;
 303     QEMUIOVector *qiov;
 304     BlockCompletionFunc *cb;
 305     void *opaque;
 306
 307     /* Filled by multiwrite implementation */
 308     int error;
 309 } BlockRequest;
 310
 311 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 312     int num_reqs);
 313
 314 /* sg packet commands */
 315 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 316 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 317         unsigned long int req, void *buf,
 318         BlockCompletionFunc *cb, void *opaque);
 319
 320 /* Invalidate any cached metadata used by image formats */
 321 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
 322 void bdrv_invalidate_cache_all(Error **errp);
 323
 324 void bdrv_clear_incoming_migration_all(void);
 325
 326 /* Ensure contents are flushed to disk.  */
 327 int bdrv_flush(BlockDriverState *bs);
 328 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 329 int bdrv_flush_all(void);
 330 void bdrv_close_all(void);
 331 void bdrv_drain_all(void);
 332
 333 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 334 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 335 int bdrv_has_zero_init_1(BlockDriverState *bs);
 336 int bdrv_has_zero_init(BlockDriverState *bs);
 337 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
 338 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 339 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 340                               int nb_sectors, int *pnum);
 341 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 342                       int *pnum);
 343 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 344                             int64_t sector_num, int nb_sectors, int *pnum);
 345
 346 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 347                        BlockdevOnError on_write_error);
 348 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 349 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 350 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 351                        bool is_read, int error);
 352 int bdrv_is_read_only(BlockDriverState *bs);
 353 int bdrv_is_sg(BlockDriverState *bs);
 354 int bdrv_enable_write_cache(BlockDriverState *bs);
 355 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 356 int bdrv_is_inserted(BlockDriverState *bs);
 357 int bdrv_media_changed(BlockDriverState *bs);
 358 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 359 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 360 const char *bdrv_get_format_name(BlockDriverState *bs);
 361 BlockDriverState *bdrv_find(const char *name);
 362 BlockDriverState *bdrv_find_node(const char *node_name);
 363 BlockDeviceInfoList *bdrv_named_nodes_list(void);
 364 BlockDriverState *bdrv_lookup_bs(const char *device,
 365                                  const char *node_name,
 366                                  Error **errp);
 367 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
 368 BlockDriverState *bdrv_next(BlockDriverState *bs);
 369 int bdrv_is_encrypted(BlockDriverState *bs);
 370 int bdrv_key_required(BlockDriverState *bs);
 371 int bdrv_set_key(BlockDriverState *bs, const char *key);
 372 int bdrv_query_missing_keys(void);
 373 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 374                          void *opaque);
 375 const char *bdrv_get_device_name(const BlockDriverState *bs);
 376 int bdrv_get_flags(BlockDriverState *bs);
 377 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 378                           const uint8_t *buf, int nb_sectors);
 379 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 380 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 381 void bdrv_round_to_clusters(BlockDriverState *bs,
 382                             int64_t sector_num, int nb_sectors,
 383                             int64_t *cluster_sector_num,
 384                             int *cluster_nb_sectors);
 385
 386 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 387 void bdrv_get_backing_filename(BlockDriverState *bs,
 388                                char *filename, int filename_size);
 389 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 390                                     char *dest, size_t sz);
 391 int bdrv_is_snapshot(BlockDriverState *bs);
 392
 393 int path_is_absolute(const char *path);
 394 void path_combine(char *dest, int dest_size,
 395                   const char *base_path,
 396                   const char *filename);
 397
 398 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 399 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 400                       int64_t pos, int size);
 401
 402 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 403                       int64_t pos, int size);
 404
 405 void bdrv_img_create(const char *filename, const char *fmt,
 406                      const char *base_filename, const char *base_fmt,
 407                      char *options, uint64_t img_size, int flags,
 408                      Error **errp, bool quiet);
 409
 410 /* Returns the alignment in bytes that is required so that no bounce buffer
 411  * is required throughout the stack */
 412 size_t bdrv_opt_mem_align(BlockDriverState *bs);
 413 void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
 414 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 415 void *qemu_blockalign0(BlockDriverState *bs, size_t size);
 416 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
 417 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
 418 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 419
 420 struct HBitmapIter;
 421 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
 422 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
 423                                           Error **errp);
 424 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 425 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 426 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 427 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 428 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 429 void bdrv_dirty_iter_init(BlockDriverState *bs,
 430                           BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
 431 int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 432
 433 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 434 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 435
 436 void bdrv_ref(BlockDriverState *bs);
 437 void bdrv_unref(BlockDriverState *bs);
 438
 439 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp);
 440 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason);
 441 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason);
 442 void bdrv_op_block_all(BlockDriverState *bs, Error *reason);
 443 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason);
 444 bool bdrv_op_blocker_is_empty(BlockDriverState *bs);
 445
 446 typedef enum {
 447     BLKDBG_L1_UPDATE,
 448
 449     BLKDBG_L1_GROW_ALLOC_TABLE,
 450     BLKDBG_L1_GROW_WRITE_TABLE,
 451     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 452
 453     BLKDBG_L2_LOAD,
 454     BLKDBG_L2_UPDATE,
 455     BLKDBG_L2_UPDATE_COMPRESSED,
 456     BLKDBG_L2_ALLOC_COW_READ,
 457     BLKDBG_L2_ALLOC_WRITE,
 458
 459     BLKDBG_READ_AIO,
 460     BLKDBG_READ_BACKING_AIO,
 461     BLKDBG_READ_COMPRESSED,
 462
 463     BLKDBG_WRITE_AIO,
 464     BLKDBG_WRITE_COMPRESSED,
 465
 466     BLKDBG_VMSTATE_LOAD,
 467     BLKDBG_VMSTATE_SAVE,
 468
 469     BLKDBG_COW_READ,
 470     BLKDBG_COW_WRITE,
 471
 472     BLKDBG_REFTABLE_LOAD,
 473     BLKDBG_REFTABLE_GROW,
 474     BLKDBG_REFTABLE_UPDATE,
 475
 476     BLKDBG_REFBLOCK_LOAD,
 477     BLKDBG_REFBLOCK_UPDATE,
 478     BLKDBG_REFBLOCK_UPDATE_PART,
 479     BLKDBG_REFBLOCK_ALLOC,
 480     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 481     BLKDBG_REFBLOCK_ALLOC_WRITE,
 482     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 483     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 484     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 485
 486     BLKDBG_CLUSTER_ALLOC,
 487     BLKDBG_CLUSTER_ALLOC_BYTES,
 488     BLKDBG_CLUSTER_FREE,
 489
 490     BLKDBG_FLUSH_TO_OS,
 491     BLKDBG_FLUSH_TO_DISK,
 492
 493     BLKDBG_PWRITEV_RMW_HEAD,
 494     BLKDBG_PWRITEV_RMW_AFTER_HEAD,
 495     BLKDBG_PWRITEV_RMW_TAIL,
 496     BLKDBG_PWRITEV_RMW_AFTER_TAIL,
 497     BLKDBG_PWRITEV,
 498     BLKDBG_PWRITEV_ZERO,
 499     BLKDBG_PWRITEV_DONE,
 500
 501     BLKDBG_EVENT_MAX,
 502 } BlkDebugEvent;
 503
 504 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 505 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 506
 507 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 508                            const char *tag);
 509 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 510 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 511 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 512
 513 /**
 514  * bdrv_get_aio_context:
 515  *
 516  * Returns: the currently bound #AioContext
 517  */
 518 AioContext *bdrv_get_aio_context(BlockDriverState *bs);
 519
 520 /**
 521  * bdrv_set_aio_context:
 522  *
 523  * Changes the #AioContext used for fd handlers, timers, and BHs by this
 524  * BlockDriverState and all its children.
 525  *
 526  * This function must be called from the old #AioContext or with a lock held so
 527  * the old #AioContext is not executing.
 528  */
 529 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
 530
 531 void bdrv_io_plug(BlockDriverState *bs);
 532 void bdrv_io_unplug(BlockDriverState *bs);
 533 void bdrv_flush_io_queue(BlockDriverState *bs);
 534
 535 BlockAcctStats *bdrv_get_stats(BlockDriverState *bs);
 536
 537 #endif