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 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
  87                                      INT_MAX >> BDRV_SECTOR_BITS)
  88
  89 /*
  90  * Allocation status flags
  91  * BDRV_BLOCK_DATA: data is read from bs->file or another file
  92  * BDRV_BLOCK_ZERO: sectors read as zero
  93  * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
  94  * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
  95  *                       layer (as opposed to the backing file)
  96  * BDRV_BLOCK_RAW: used internally to indicate that the request
  97  *                 was answered by the raw driver and that one
  98  *                 should look in bs->file directly.
  99  *
 100  * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
 101  * bs->file where sector data can be read from as raw data.
 102  *
 103  * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
 104  *
 105  * DATA ZERO OFFSET_VALID
 106  *  t    t        t       sectors read as zero, bs->file is zero at offset
 107  *  t    f        t       sectors read as valid from bs->file at offset
 108  *  f    t        t       sectors preallocated, read as zero, bs->file not
 109  *                        necessarily zero at offset
 110  *  f    f        t       sectors preallocated but read from backing_hd,
 111  *                        bs->file contains garbage at offset
 112  *  t    t        f       sectors preallocated, read as zero, unknown offset
 113  *  t    f        f       sectors read from unknown file or offset
 114  *  f    t        f       not allocated or unknown offset, read as zero
 115  *  f    f        f       not allocated or unknown offset, read from backing_hd
 116  */
 117 #define BDRV_BLOCK_DATA         0x01
 118 #define BDRV_BLOCK_ZERO         0x02
 119 #define BDRV_BLOCK_OFFSET_VALID 0x04
 120 #define BDRV_BLOCK_RAW          0x08
 121 #define BDRV_BLOCK_ALLOCATED    0x10
 122 #define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK
 123
 124 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
 125
 126 typedef struct BDRVReopenState {
 127     BlockDriverState *bs;
 128     int flags;
 129     void *opaque;
 130 } BDRVReopenState;
 131
 132 /*
 133  * Block operation types
 134  */
 135 typedef enum BlockOpType {
 136     BLOCK_OP_TYPE_BACKUP_SOURCE,
 137     BLOCK_OP_TYPE_BACKUP_TARGET,
 138     BLOCK_OP_TYPE_CHANGE,
 139     BLOCK_OP_TYPE_COMMIT_SOURCE,
 140     BLOCK_OP_TYPE_COMMIT_TARGET,
 141     BLOCK_OP_TYPE_DATAPLANE,
 142     BLOCK_OP_TYPE_DRIVE_DEL,
 143     BLOCK_OP_TYPE_EJECT,
 144     BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
 145     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT,
 146     BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
 147     BLOCK_OP_TYPE_MIRROR,
 148     BLOCK_OP_TYPE_RESIZE,
 149     BLOCK_OP_TYPE_STREAM,
 150     BLOCK_OP_TYPE_REPLACE,
 151     BLOCK_OP_TYPE_MAX,
 152 } BlockOpType;
 153
 154 void bdrv_iostatus_enable(BlockDriverState *bs);
 155 void bdrv_iostatus_reset(BlockDriverState *bs);
 156 void bdrv_iostatus_disable(BlockDriverState *bs);
 157 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 158 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 159 void bdrv_info_print(Monitor *mon, const QObject *data);
 160 void bdrv_info(Monitor *mon, QObject **ret_data);
 161 void bdrv_stats_print(Monitor *mon, const QObject *data);
 162 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 163
 164 /* disk I/O throttling */
 165 void bdrv_io_limits_enable(BlockDriverState *bs);
 166 void bdrv_io_limits_disable(BlockDriverState *bs);
 167
 168 void bdrv_init(void);
 169 void bdrv_init_with_whitelist(void);
 170 BlockDriver *bdrv_find_protocol(const char *filename,
 171                                 bool allow_protocol_prefix,
 172                                 Error **errp);
 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                 QemuOpts *opts, Error **errp);
 178 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
 179 BlockDriverState *bdrv_new_root(void);
 180 BlockDriverState *bdrv_new(void);
 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_open_image(BlockDriverState **pbs, const char *filename,
 187                     QDict *options, const char *bdref_key, int flags,
 188                     bool allow_none, Error **errp);
 189 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd);
 190 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
 191 int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp);
 192 int bdrv_open(BlockDriverState **pbs, const char *filename,
 193               const char *reference, QDict *options, int flags,
 194               BlockDriver *drv, Error **errp);
 195 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 196                                     BlockDriverState *bs, int flags);
 197 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 198 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 199 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 200                         BlockReopenQueue *queue, Error **errp);
 201 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 202 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 203 void bdrv_close(BlockDriverState *bs);
 204 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 205 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 206               uint8_t *buf, int nb_sectors);
 207 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 208                           uint8_t *buf, int nb_sectors);
 209 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 210                const uint8_t *buf, int nb_sectors);
 211 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 212                int nb_sectors, BdrvRequestFlags flags);
 213 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 214                                   int nb_sectors, BdrvRequestFlags flags,
 215                                   BlockCompletionFunc *cb, void *opaque);
 216 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
 217 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 218                void *buf, int count);
 219 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 220                 const void *buf, int count);
 221 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
 222 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 223     const void *buf, int count);
 224 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 225     int nb_sectors, QEMUIOVector *qiov);
 226 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 227     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 228 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 229     int nb_sectors, QEMUIOVector *qiov);
 230 /*
 231  * Efficiently zero a region of the disk image.  Note that this is a regular
 232  * I/O request like read or write and should have a reasonable size.  This
 233  * function is not suitable for zeroing the entire image in a single request
 234  * because it may allocate memory for the entire region.
 235  */
 236 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 237     int nb_sectors, BdrvRequestFlags flags);
 238 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 239     const char *backing_file);
 240 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 241 void bdrv_refresh_filename(BlockDriverState *bs);
 242 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 243 int64_t bdrv_nb_sectors(BlockDriverState *bs);
 244 int64_t bdrv_getlength(BlockDriverState *bs);
 245 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 246 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 247 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp);
 248 int bdrv_commit(BlockDriverState *bs);
 249 int bdrv_commit_all(void);
 250 int bdrv_change_backing_file(BlockDriverState *bs,
 251     const char *backing_file, const char *backing_fmt);
 252 void bdrv_register(BlockDriver *bdrv);
 253 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 254                            BlockDriverState *base,
 255                            const char *backing_file_str);
 256 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 257                                     BlockDriverState *bs);
 258 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 259
 260
 261 typedef struct BdrvCheckResult {
 262     int corruptions;
 263     int leaks;
 264     int check_errors;
 265     int corruptions_fixed;
 266     int leaks_fixed;
 267     int64_t image_end_offset;
 268     BlockFragInfo bfi;
 269 } BdrvCheckResult;
 270
 271 typedef enum {
 272     BDRV_FIX_LEAKS    = 1,
 273     BDRV_FIX_ERRORS   = 2,
 274 } BdrvCheckMode;
 275
 276 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 277
 278 /* The units of offset and total_work_size may be chosen arbitrarily by the
 279  * block driver; total_work_size may change during the course of the amendment
 280  * operation */
 281 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset,
 282                                       int64_t total_work_size);
 283 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
 284                        BlockDriverAmendStatusCB *status_cb);
 285
 286 /* external snapshots */
 287 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
 288                                       BlockDriverState *candidate);
 289 bool bdrv_is_first_non_filter(BlockDriverState *candidate);
 290
 291 /* check if a named node can be replaced when doing drive-mirror */
 292 BlockDriverState *check_to_replace_node(const char *node_name, Error **errp);
 293
 294 /* async block I/O */
 295 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 296                                      int sector_num);
 297 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 298                            QEMUIOVector *iov, int nb_sectors,
 299                            BlockCompletionFunc *cb, void *opaque);
 300 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 301                             QEMUIOVector *iov, int nb_sectors,
 302                             BlockCompletionFunc *cb, void *opaque);
 303 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 304                            BlockCompletionFunc *cb, void *opaque);
 305 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 306                              int64_t sector_num, int nb_sectors,
 307                              BlockCompletionFunc *cb, void *opaque);
 308 void bdrv_aio_cancel(BlockAIOCB *acb);
 309 void bdrv_aio_cancel_async(BlockAIOCB *acb);
 310
 311 typedef struct BlockRequest {
 312     /* Fields to be filled by multiwrite caller */
 313     int64_t sector;
 314     int nb_sectors;
 315     int flags;
 316     QEMUIOVector *qiov;
 317     BlockCompletionFunc *cb;
 318     void *opaque;
 319
 320     /* Filled by multiwrite implementation */
 321     int error;
 322 } BlockRequest;
 323
 324 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 325     int num_reqs);
 326
 327 /* sg packet commands */
 328 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 329 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 330         unsigned long int req, void *buf,
 331         BlockCompletionFunc *cb, void *opaque);
 332
 333 /* Invalidate any cached metadata used by image formats */
 334 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
 335 void bdrv_invalidate_cache_all(Error **errp);
 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(BlockDriverState *bs);
 343 void bdrv_drain_all(void);
 344
 345 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 346 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 347 int bdrv_has_zero_init_1(BlockDriverState *bs);
 348 int bdrv_has_zero_init(BlockDriverState *bs);
 349 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
 350 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 351 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
 352                               int nb_sectors, int *pnum);
 353 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 354                       int *pnum);
 355 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 356                             int64_t sector_num, int nb_sectors, int *pnum);
 357
 358 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 359                        BlockdevOnError on_write_error);
 360 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 361 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 362 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 363                        bool is_read, int error);
 364 int bdrv_is_read_only(BlockDriverState *bs);
 365 int bdrv_is_sg(BlockDriverState *bs);
 366 int bdrv_enable_write_cache(BlockDriverState *bs);
 367 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 368 int bdrv_is_inserted(BlockDriverState *bs);
 369 int bdrv_media_changed(BlockDriverState *bs);
 370 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 371 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 372 const char *bdrv_get_format_name(BlockDriverState *bs);
 373 BlockDriverState *bdrv_find(const char *name);
 374 BlockDriverState *bdrv_find_node(const char *node_name);
 375 BlockDeviceInfoList *bdrv_named_nodes_list(void);
 376 BlockDriverState *bdrv_lookup_bs(const char *device,
 377                                  const char *node_name,
 378                                  Error **errp);
 379 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
 380 BlockDriverState *bdrv_next_node(BlockDriverState *bs);
 381 BlockDriverState *bdrv_next(BlockDriverState *bs);
 382 int bdrv_is_encrypted(BlockDriverState *bs);
 383 int bdrv_key_required(BlockDriverState *bs);
 384 int bdrv_set_key(BlockDriverState *bs, const char *key);
 385 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp);
 386 int bdrv_query_missing_keys(void);
 387 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 388                          void *opaque);
 389 const char *bdrv_get_node_name(const BlockDriverState *bs);
 390 const char *bdrv_get_device_name(const BlockDriverState *bs);
 391 int bdrv_get_flags(BlockDriverState *bs);
 392 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 393                           const uint8_t *buf, int nb_sectors);
 394 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 395 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 396 void bdrv_round_to_clusters(BlockDriverState *bs,
 397                             int64_t sector_num, int nb_sectors,
 398                             int64_t *cluster_sector_num,
 399                             int *cluster_nb_sectors);
 400
 401 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 402 void bdrv_get_backing_filename(BlockDriverState *bs,
 403                                char *filename, int filename_size);
 404 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 405                                     char *dest, size_t sz, Error **errp);
 406 void bdrv_get_full_backing_filename_from_filename(const char *backed,
 407                                                   const char *backing,
 408                                                   char *dest, size_t sz,
 409                                                   Error **errp);
 410 int bdrv_is_snapshot(BlockDriverState *bs);
 411
 412 int path_has_protocol(const char *path);
 413 int path_is_absolute(const char *path);
 414 void path_combine(char *dest, int dest_size,
 415                   const char *base_path,
 416                   const char *filename);
 417
 418 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 419 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 420                       int64_t pos, int size);
 421
 422 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 423                       int64_t pos, int size);
 424
 425 void bdrv_img_create(const char *filename, const char *fmt,
 426                      const char *base_filename, const char *base_fmt,
 427                      char *options, uint64_t img_size, int flags,
 428                      Error **errp, bool quiet);
 429
 430 /* Returns the alignment in bytes that is required so that no bounce buffer
 431  * is required throughout the stack */
 432 size_t bdrv_opt_mem_align(BlockDriverState *bs);
 433 void bdrv_set_guest_block_size(BlockDriverState *bs, int align);
 434 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 435 void *qemu_blockalign0(BlockDriverState *bs, size_t size);
 436 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
 437 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
 438 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
 439
 440 struct HBitmapIter;
 441 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
 442 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
 443                                           Error **errp);
 444 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 445 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 446 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 447 void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
 448                            int64_t cur_sector, int nr_sectors);
 449 void bdrv_reset_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap,
 450                              int64_t cur_sector, int nr_sectors);
 451 void bdrv_dirty_iter_init(BlockDriverState *bs,
 452                           BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
 453 int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 454
 455 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 456 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 457
 458 void bdrv_ref(BlockDriverState *bs);
 459 void bdrv_unref(BlockDriverState *bs);
 460
 461 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp);
 462 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason);
 463 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason);
 464 void bdrv_op_block_all(BlockDriverState *bs, Error *reason);
 465 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason);
 466 bool bdrv_op_blocker_is_empty(BlockDriverState *bs);
 467
 468 typedef enum {
 469     BLKDBG_L1_UPDATE,
 470
 471     BLKDBG_L1_GROW_ALLOC_TABLE,
 472     BLKDBG_L1_GROW_WRITE_TABLE,
 473     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 474
 475     BLKDBG_L2_LOAD,
 476     BLKDBG_L2_UPDATE,
 477     BLKDBG_L2_UPDATE_COMPRESSED,
 478     BLKDBG_L2_ALLOC_COW_READ,
 479     BLKDBG_L2_ALLOC_WRITE,
 480
 481     BLKDBG_READ_AIO,
 482     BLKDBG_READ_BACKING_AIO,
 483     BLKDBG_READ_COMPRESSED,
 484
 485     BLKDBG_WRITE_AIO,
 486     BLKDBG_WRITE_COMPRESSED,
 487
 488     BLKDBG_VMSTATE_LOAD,
 489     BLKDBG_VMSTATE_SAVE,
 490
 491     BLKDBG_COW_READ,
 492     BLKDBG_COW_WRITE,
 493
 494     BLKDBG_REFTABLE_LOAD,
 495     BLKDBG_REFTABLE_GROW,
 496     BLKDBG_REFTABLE_UPDATE,
 497
 498     BLKDBG_REFBLOCK_LOAD,
 499     BLKDBG_REFBLOCK_UPDATE,
 500     BLKDBG_REFBLOCK_UPDATE_PART,
 501     BLKDBG_REFBLOCK_ALLOC,
 502     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 503     BLKDBG_REFBLOCK_ALLOC_WRITE,
 504     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 505     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 506     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 507
 508     BLKDBG_CLUSTER_ALLOC,
 509     BLKDBG_CLUSTER_ALLOC_BYTES,
 510     BLKDBG_CLUSTER_FREE,
 511
 512     BLKDBG_FLUSH_TO_OS,
 513     BLKDBG_FLUSH_TO_DISK,
 514
 515     BLKDBG_PWRITEV_RMW_HEAD,
 516     BLKDBG_PWRITEV_RMW_AFTER_HEAD,
 517     BLKDBG_PWRITEV_RMW_TAIL,
 518     BLKDBG_PWRITEV_RMW_AFTER_TAIL,
 519     BLKDBG_PWRITEV,
 520     BLKDBG_PWRITEV_ZERO,
 521     BLKDBG_PWRITEV_DONE,
 522
 523     BLKDBG_EMPTY_IMAGE_PREPARE,
 524
 525     BLKDBG_EVENT_MAX,
 526 } BlkDebugEvent;
 527
 528 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 529 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 530
 531 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
 532                            const char *tag);
 533 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 534 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 535 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 536
 537 /**
 538  * bdrv_get_aio_context:
 539  *
 540  * Returns: the currently bound #AioContext
 541  */
 542 AioContext *bdrv_get_aio_context(BlockDriverState *bs);
 543
 544 /**
 545  * bdrv_set_aio_context:
 546  *
 547  * Changes the #AioContext used for fd handlers, timers, and BHs by this
 548  * BlockDriverState and all its children.
 549  *
 550  * This function must be called from the old #AioContext or with a lock held so
 551  * the old #AioContext is not executing.
 552  */
 553 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
 554
 555 void bdrv_io_plug(BlockDriverState *bs);
 556 void bdrv_io_unplug(BlockDriverState *bs);
 557 void bdrv_flush_io_queue(BlockDriverState *bs);
 558
 559 BlockAcctStats *bdrv_get_stats(BlockDriverState *bs);
 560
 561 #endif