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 /*
  87  * Allocation status flags
  88  * BDRV_BLOCK_DATA: data is read from bs->file or another file
  89  * BDRV_BLOCK_ZERO: sectors read as zero
  90  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
  91  * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
  92  *                       layer (as opposed to the backing file)
  93  * BDRV_BLOCK_RAW: used internally to indicate that the request
  94  *                 was answered by the raw driver and that one
  95  *                 should look in bs->file directly.
  96  *
  97  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
  98  * bs->file where sector data can be read from as raw data.
  99  *
 100  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
 101  *
 102  * DATA ZERO OFFSET_VALID
 103  *  t    t        t       sectors read as zero, bs->file is zero at offset
 104  *  t    f        t       sectors read as valid from bs->file at offset
 105  *  f    t        t       sectors preallocated, read as zero, bs->file not
 106  *                        necessarily zero at offset
 107  *  f    f        t       sectors preallocated but read from backing_hd,
 108  *                        bs->file contains garbage at offset
 109  *  t    t        f       sectors preallocated, read as zero, unknown offset
 110  *  t    f        f       sectors read from unknown file or offset
 111  *  f    t        f       not allocated or unknown offset, read as zero
 112  *  f    f        f       not allocated or unknown offset, read from backing_hd
 113  */
 114 #define BDRV_BLOCK_DATA         0x01
 115 #define BDRV_BLOCK_ZERO         0x02
 116 #define BDRV_BLOCK_OFFSET_VALID 0x04
 117 #define BDRV_BLOCK_RAW          0x08
 118 #define BDRV_BLOCK_ALLOCATED    0x10
 119 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 120
 121 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 122
 123 typedef struct BDRVReopenState {
 124     BlockDriverState *bs;
 125     int flags;
 126     void *opaque;
 127 } BDRVReopenState;
 128
 129 /*
 130  * Block operation types
 131  */
 132 typedef enum BlockOpType {
 133     BLOCK_OP_TYPE_BACKUP_SOURCE,
 134     BLOCK_OP_TYPE_BACKUP_TARGET,
 135     BLOCK_OP_TYPE_CHANGE,
 136     BLOCK_OP_TYPE_COMMIT,
 137     BLOCK_OP_TYPE_DATAPLANE,
 138     BLOCK_OP_TYPE_DRIVE_DEL,
 139     BLOCK_OP_TYPE_EJECT,
 140     BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
 141     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT,
 142     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
 143     BLOCK_OP_TYPE_MIRROR,
 144     BLOCK_OP_TYPE_RESIZE,
 145     BLOCK_OP_TYPE_STREAM,
 146     BLOCK_OP_TYPE_REPLACE,
 147     BLOCK_OP_TYPE_MAX,
 148 } BlockOpType;
 149
 150 void bdrv_iostatus_enable(BlockDriverState *bs);
 151 void bdrv_iostatus_reset(BlockDriverState *bs);
 152 void bdrv_iostatus_disable(BlockDriverState *bs);
 153 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 154 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 155 void bdrv_info_print(Monitor *mon, const QObject *data);
 156 void bdrv_info(Monitor *mon, QObject **ret_data);
 157 void bdrv_stats_print(Monitor *mon, const QObject *data);
 158 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 159
 160 /* disk I/O throttling */
 161 void bdrv_io_limits_enable(BlockDriverState *bs);
 162 void bdrv_io_limits_disable(BlockDriverState *bs);
 163
 164 void bdrv_init(void);
 165 void bdrv_init_with_whitelist(void);
 166 BlockDriver *bdrv_find_protocol(const char *filename,
 167                                 bool allow_protocol_prefix);
 168 BlockDriver *bdrv_find_format(const char *format_name);
 169 BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
 170                                           bool readonly);
 171 int bdrv_create(BlockDriver *drv, const char* filename,
 172                 QemuOpts *opts, Error **errp);
 173 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
 174 BlockDriverState *bdrv_new_root(void);
 175 BlockDriverState *bdrv_new(void);
 176 void bdrv_make_anon(BlockDriverState *bs);
 177 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 178 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 179 int bdrv_parse_cache_flags(const char *mode, int *flags);
 180 int bdrv_parse_discard_flags(const char *mode, int *flags);
 181 int bdrv_open_image(BlockDriverState **pbs, const char *filename,
 182                     QDict *options, const char *bdref_key, int flags,
 183                     bool allow_none, Error **errp);
 184 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd);
 185 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 186 int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp);
 187 int bdrv_open(BlockDriverState **pbs, const char *filename,
 188               const char *reference, QDict *options, int flags,
 189               BlockDriver *drv, Error **errp);
 190 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 191                                     BlockDriverState *bs, int flags);
 192 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 193 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 194 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 195                         BlockReopenQueue *queue, Error **errp);
 196 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 197 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 198 void bdrv_close(BlockDriverState *bs);
 199 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 200 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 201               uint8_t *buf, int nb_sectors);
 202 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 203                           uint8_t *buf, int nb_sectors);
 204 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 205                const uint8_t *buf, int nb_sectors);
 206 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 207                int nb_sectors, BdrvRequestFlags flags);
 208 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 209                                   int nb_sectors, BdrvRequestFlags flags,
 210                                   BlockCompletionFunc *cb, void *opaque);
 211 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 212 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 213                void *buf, int count);
 214 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 215                 const void *buf, int count);
 216 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 217 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 218     const void *buf, int count);
 219 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 220     int nb_sectors, QEMUIOVector *qiov);
 221 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 222     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 223 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 224     int nb_sectors, QEMUIOVector *qiov);
 225 /*
 226  * Efficiently zero a region of the disk image.  Note that this is a regular
 227  * I/O request like read or write and should have a reasonable size.  This
 228  * function is not suitable for zeroing the entire image in a single request
 229  * because it may allocate memory for the entire region.
 230  */
 231 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 232     int nb_sectors, BdrvRequestFlags flags);
 233 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 234     const char *backing_file);
 235 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 236 void bdrv_refresh_filename(BlockDriverState *bs);
 237 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 238 int64_t bdrv_nb_sectors(BlockDriverState *bs);
 239 int64_t bdrv_getlength(BlockDriverState *bs);
 240 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 241 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 242 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp);
 243 int bdrv_commit(BlockDriverState *bs);
 244 int bdrv_commit_all(void);
 245 int bdrv_change_backing_file(BlockDriverState *bs,
 246     const char *backing_file, const char *backing_fmt);
 247 void bdrv_register(BlockDriver *bdrv);
 248 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 249                            BlockDriverState *base,
 250                            const char *backing_file_str);
 251 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 252                                     BlockDriverState *bs);
 253 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 254
 255
 256 typedef struct BdrvCheckResult {
 257     int corruptions;
 258     int leaks;
 259     int check_errors;
 260     int corruptions_fixed;
 261     int leaks_fixed;
 262     int64_t image_end_offset;
 263     BlockFragInfo bfi;
 264 } BdrvCheckResult;
 265
 266 typedef enum {
 267     BDRV_FIX_LEAKS    = 1,
 268     BDRV_FIX_ERRORS   = 2,
 269 } BdrvCheckMode;
 270
 271 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 272
 273 /* The units of offset and total_work_size may be chosen arbitrarily by the
 274  * block driver; total_work_size may change during the course of the amendment
 275  * operation */
 276 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset,
 277                                       int64_t total_work_size);
 278 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
 279                        BlockDriverAmendStatusCB *status_cb);
 280
 281 /* external snapshots */
 282 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
 283                                       BlockDriverState *candidate);
 284 bool bdrv_is_first_non_filter(BlockDriverState *candidate);
 285
 286 /* check if a named node can be replaced when doing drive-mirror */
 287 BlockDriverState *check_to_replace_node(const char *node_name, Error **errp);
 288
 289 /* async block I/O */
 290 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 291                                      int sector_num);
 292 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 293                            QEMUIOVector *iov, int nb_sectors,
 294                            BlockCompletionFunc *cb, void *opaque);
 295 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 296                             QEMUIOVector *iov, int nb_sectors,
 297                             BlockCompletionFunc *cb, void *opaque);
 298 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 299                            BlockCompletionFunc *cb, void *opaque);
 300 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 301                              int64_t sector_num, int nb_sectors,
 302                              BlockCompletionFunc *cb, void *opaque);
 303 void bdrv_aio_cancel(BlockAIOCB *acb);
 304 void bdrv_aio_cancel_async(BlockAIOCB *acb);
 305
 306 typedef struct BlockRequest {
 307     /* Fields to be filled by multiwrite caller */
 308     int64_t sector;
 309     int nb_sectors;
 310     int flags;
 311     QEMUIOVector *qiov;
 312     BlockCompletionFunc *cb;
 313     void *opaque;
 314
 315     /* Filled by multiwrite implementation */
 316     int error;
 317 } BlockRequest;
 318
 319 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 320     int num_reqs);
 321
 322 /* sg packet commands */
 323 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 324 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 325         unsigned long int req, void *buf,
 326         BlockCompletionFunc *cb, void *opaque);
 327
 328 /* Invalidate any cached metadata used by image formats */
 329 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
 330 void bdrv_invalidate_cache_all(Error **errp);
 331
 332 /* Ensure contents are flushed to disk.  */
 333 int bdrv_flush(BlockDriverState *bs);
 334 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 335 int bdrv_flush_all(void);
 336 void bdrv_close_all(void);
 337 void bdrv_drain(BlockDriverState *bs);
 338 void bdrv_drain_all(void);
 339
 340 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 341 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 342 int bdrv_has_zero_init_1(BlockDriverState *bs);
 343 int bdrv_has_zero_init(BlockDriverState *bs);
 344 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
 345 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 346 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 347                               int nb_sectors, int *pnum);
 348 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 349                       int *pnum);
 350 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 351                             int64_t sector_num, int nb_sectors, int *pnum);
 352
 353 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 354                        BlockdevOnError on_write_error);
 355 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 356 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 357 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 358                        bool is_read, int error);
 359 int bdrv_is_read_only(BlockDriverState *bs);
 360 int bdrv_is_sg(BlockDriverState *bs);
 361 int bdrv_enable_write_cache(BlockDriverState *bs);
 362 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 363 int bdrv_is_inserted(BlockDriverState *bs);
 364 int bdrv_media_changed(BlockDriverState *bs);
 365 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 366 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 367 const char *bdrv_get_format_name(BlockDriverState *bs);
 368 BlockDriverState *bdrv_find(const char *name);
 369 BlockDriverState *bdrv_find_node(const char *node_name);
 370 BlockDeviceInfoList *bdrv_named_nodes_list(void);
 371 BlockDriverState *bdrv_lookup_bs(const char *device,
 372                                  const char *node_name,
 373                                  Error **errp);
 374 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
 375 BlockDriverState *bdrv_next_node(BlockDriverState *bs);
 376 BlockDriverState *bdrv_next(BlockDriverState *bs);
 377 int bdrv_is_encrypted(BlockDriverState *bs);
 378 int bdrv_key_required(BlockDriverState *bs);
 379 int bdrv_set_key(BlockDriverState *bs, const char *key);
 380 int bdrv_query_missing_keys(void);
 381 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 382                          void *opaque);
 383 const char *bdrv_get_node_name(const BlockDriverState *bs);
 384 const char *bdrv_get_device_name(const BlockDriverState *bs);
 385 int bdrv_get_flags(BlockDriverState *bs);
 386 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 387                           const uint8_t *buf, int nb_sectors);
 388 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 389 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 390 void bdrv_round_to_clusters(BlockDriverState *bs,
 391                             int64_t sector_num, int nb_sectors,
 392                             int64_t *cluster_sector_num,
 393                             int *cluster_nb_sectors);
 394
 395 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 396 void bdrv_get_backing_filename(BlockDriverState *bs,
 397                                char *filename, int filename_size);
 398 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 399                                     char *dest, size_t sz);
 400 int bdrv_is_snapshot(BlockDriverState *bs);
 401
 402 int path_has_protocol(const char *path);
 403 int path_is_absolute(const char *path);
 404 void path_combine(char *dest, int dest_size,
 405                   const char *base_path,
 406                   const char *filename);
 407
 408 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 409 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 410                       int64_t pos, int size);
 411
 412 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 413                       int64_t pos, int size);
 414
 415 void bdrv_img_create(const char *filename, const char *fmt,
 416                      const char *base_filename, const char *base_fmt,
 417                      char *options, uint64_t img_size, int flags,
 418                      Error **errp, bool quiet);
 419
 420 /* Returns the alignment in bytes that is required so that no bounce buffer
 421  * is required throughout the stack */
 422 size_t bdrv_opt_mem_align(BlockDriverState *bs);
 423 void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
 424 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 425 void *qemu_blockalign0(BlockDriverState *bs, size_t size);
 426 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
 427 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
 428 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 429
 430 struct HBitmapIter;
 431 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
 432 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
 433                                           Error **errp);
 434 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 435 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 436 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 437 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 438 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 439 void bdrv_dirty_iter_init(BlockDriverState *bs,
 440                           BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
 441 int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 442
 443 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 444 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 445
 446 void bdrv_ref(BlockDriverState *bs);
 447 void bdrv_unref(BlockDriverState *bs);
 448
 449 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp);
 450 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason);
 451 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason);
 452 void bdrv_op_block_all(BlockDriverState *bs, Error *reason);
 453 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason);
 454 bool bdrv_op_blocker_is_empty(BlockDriverState *bs);
 455
 456 typedef enum {
 457     BLKDBG_L1_UPDATE,
 458
 459     BLKDBG_L1_GROW_ALLOC_TABLE,
 460     BLKDBG_L1_GROW_WRITE_TABLE,
 461     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 462
 463     BLKDBG_L2_LOAD,
 464     BLKDBG_L2_UPDATE,
 465     BLKDBG_L2_UPDATE_COMPRESSED,
 466     BLKDBG_L2_ALLOC_COW_READ,
 467     BLKDBG_L2_ALLOC_WRITE,
 468
 469     BLKDBG_READ_AIO,
 470     BLKDBG_READ_BACKING_AIO,
 471     BLKDBG_READ_COMPRESSED,
 472
 473     BLKDBG_WRITE_AIO,
 474     BLKDBG_WRITE_COMPRESSED,
 475
 476     BLKDBG_VMSTATE_LOAD,
 477     BLKDBG_VMSTATE_SAVE,
 478
 479     BLKDBG_COW_READ,
 480     BLKDBG_COW_WRITE,
 481
 482     BLKDBG_REFTABLE_LOAD,
 483     BLKDBG_REFTABLE_GROW,
 484     BLKDBG_REFTABLE_UPDATE,
 485
 486     BLKDBG_REFBLOCK_LOAD,
 487     BLKDBG_REFBLOCK_UPDATE,
 488     BLKDBG_REFBLOCK_UPDATE_PART,
 489     BLKDBG_REFBLOCK_ALLOC,
 490     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 491     BLKDBG_REFBLOCK_ALLOC_WRITE,
 492     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 493     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 494     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 495
 496     BLKDBG_CLUSTER_ALLOC,
 497     BLKDBG_CLUSTER_ALLOC_BYTES,
 498     BLKDBG_CLUSTER_FREE,
 499
 500     BLKDBG_FLUSH_TO_OS,
 501     BLKDBG_FLUSH_TO_DISK,
 502
 503     BLKDBG_PWRITEV_RMW_HEAD,
 504     BLKDBG_PWRITEV_RMW_AFTER_HEAD,
 505     BLKDBG_PWRITEV_RMW_TAIL,
 506     BLKDBG_PWRITEV_RMW_AFTER_TAIL,
 507     BLKDBG_PWRITEV,
 508     BLKDBG_PWRITEV_ZERO,
 509     BLKDBG_PWRITEV_DONE,
 510
 511     BLKDBG_EMPTY_IMAGE_PREPARE,
 512
 513     BLKDBG_EVENT_MAX,
 514 } BlkDebugEvent;
 515
 516 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 517 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 518
 519 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 520                            const char *tag);
 521 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 522 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 523 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 524
 525 /**
 526  * bdrv_get_aio_context:
 527  *
 528  * Returns: the currently bound #AioContext
 529  */
 530 AioContext *bdrv_get_aio_context(BlockDriverState *bs);
 531
 532 /**
 533  * bdrv_set_aio_context:
 534  *
 535  * Changes the #AioContext used for fd handlers, timers, and BHs by this
 536  * BlockDriverState and all its children.
 537  *
 538  * This function must be called from the old #AioContext or with a lock held so
 539  * the old #AioContext is not executing.
 540  */
 541 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
 542
 543 void bdrv_io_plug(BlockDriverState *bs);
 544 void bdrv_io_unplug(BlockDriverState *bs);
 545 void bdrv_flush_io_queue(BlockDriverState *bs);
 546
 547 BlockAcctStats *bdrv_get_stats(BlockDriverState *bs);
 548
 549 #endif