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 } BlockDriverInfo; 22 23 typedef struct BlockFragInfo { 24 uint64_t allocated_clusters; 25 uint64_t total_clusters; 26 uint64_t fragmented_clusters; 27 uint64_t compressed_clusters; 28 } BlockFragInfo; 29 30 typedef struct QEMUSnapshotInfo { 31 char id_str[128]; /* unique snapshot id */ 32 /* the following fields are informative. They are not needed for 33 the consistency of the snapshot */ 34 char name[256]; /* user chosen name */ 35 uint64_t vm_state_size; /* VM state info size */ 36 uint32_t date_sec; /* UTC date of the snapshot */ 37 uint32_t date_nsec; 38 uint64_t vm_clock_nsec; /* VM clock relative to boot */ 39 } QEMUSnapshotInfo; 40 41 /* Callbacks for block device models */ 42 typedef struct BlockDevOps { 43 /* 44 * Runs when virtual media changed (monitor commands eject, change) 45 * Argument load is true on load and false on eject. 46 * Beware: doesn't run when a host device's physical media 47 * changes. Sure would be useful if it did. 48 * Device models with removable media must implement this callback. 49 */ 50 void (*change_media_cb)(void *opaque, bool load); 51 /* 52 * Runs when an eject request is issued from the monitor, the tray 53 * is closed, and the medium is locked. 54 * Device models that do not implement is_medium_locked will not need 55 * this callback. Device models that can lock the medium or tray might 56 * want to implement the callback and unlock the tray when "force" is 57 * true, even if they do not support eject requests. 58 */ 59 void (*eject_request_cb)(void *opaque, bool force); 60 /* 61 * Is the virtual tray open? 62 * Device models implement this only when the device has a tray. 63 */ 64 bool (*is_tray_open)(void *opaque); 65 /* 66 * Is the virtual medium locked into the device? 67 * Device models implement this only when device has such a lock. 68 */ 69 bool (*is_medium_locked)(void *opaque); 70 /* 71 * Runs when the size changed (e.g. monitor command block_resize) 72 */ 73 void (*resize_cb)(void *opaque); 74 } BlockDevOps; 75 76 #define BDRV_O_RDWR 0x0002 77 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 78 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 79 #define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */ 80 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 81 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 82 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 83 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 84 #define BDRV_O_INCOMING 0x0800 /* consistency hint for incoming migration */ 85 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 86 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 87 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 88 89 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH) 90 91 #define BDRV_SECTOR_BITS 9 92 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 93 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 94 95 typedef enum { 96 BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP 97 } BlockErrorAction; 98 99 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 100 101 typedef struct BDRVReopenState { 102 BlockDriverState *bs; 103 int flags; 104 void *opaque; 105 } BDRVReopenState; 106 107 108 void bdrv_iostatus_enable(BlockDriverState *bs); 109 void bdrv_iostatus_reset(BlockDriverState *bs); 110 void bdrv_iostatus_disable(BlockDriverState *bs); 111 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs); 112 void bdrv_iostatus_set_err(BlockDriverState *bs, int error); 113 void bdrv_info_print(Monitor *mon, const QObject *data); 114 void bdrv_info(Monitor *mon, QObject **ret_data); 115 void bdrv_stats_print(Monitor *mon, const QObject *data); 116 void bdrv_info_stats(Monitor *mon, QObject **ret_data); 117 118 /* disk I/O throttling */ 119 void bdrv_io_limits_enable(BlockDriverState *bs); 120 void bdrv_io_limits_disable(BlockDriverState *bs); 121 bool bdrv_io_limits_enabled(BlockDriverState *bs); 122 123 void bdrv_init(void); 124 void bdrv_init_with_whitelist(void); 125 BlockDriver *bdrv_find_protocol(const char *filename); 126 BlockDriver *bdrv_find_format(const char *format_name); 127 BlockDriver *bdrv_find_whitelisted_format(const char *format_name); 128 int bdrv_create(BlockDriver *drv, const char* filename, 129 QEMUOptionParameter *options); 130 int bdrv_create_file(const char* filename, QEMUOptionParameter *options); 131 BlockDriverState *bdrv_new(const char *device_name); 132 void bdrv_make_anon(BlockDriverState *bs); 133 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old); 134 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); 135 void bdrv_delete(BlockDriverState *bs); 136 int bdrv_parse_cache_flags(const char *mode, int *flags); 137 int bdrv_parse_discard_flags(const char *mode, int *flags); 138 int bdrv_file_open(BlockDriverState **pbs, const char *filename, 139 QDict *options, int flags); 140 int bdrv_open_backing_file(BlockDriverState *bs); 141 int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, 142 int flags, BlockDriver *drv); 143 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 144 BlockDriverState *bs, int flags); 145 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); 146 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 147 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 148 BlockReopenQueue *queue, Error **errp); 149 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 150 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 151 void bdrv_close(BlockDriverState *bs); 152 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify); 153 int bdrv_attach_dev(BlockDriverState *bs, void *dev); 154 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev); 155 void bdrv_detach_dev(BlockDriverState *bs, void *dev); 156 void *bdrv_get_attached_dev(BlockDriverState *bs); 157 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, 158 void *opaque); 159 void bdrv_dev_eject_request(BlockDriverState *bs, bool force); 160 bool bdrv_dev_has_removable_media(BlockDriverState *bs); 161 bool bdrv_dev_is_tray_open(BlockDriverState *bs); 162 bool bdrv_dev_is_medium_locked(BlockDriverState *bs); 163 int bdrv_read(BlockDriverState *bs, int64_t sector_num, 164 uint8_t *buf, int nb_sectors); 165 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, 166 uint8_t *buf, int nb_sectors); 167 int bdrv_write(BlockDriverState *bs, int64_t sector_num, 168 const uint8_t *buf, int nb_sectors); 169 int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov); 170 int bdrv_pread(BlockDriverState *bs, int64_t offset, 171 void *buf, int count); 172 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 173 const void *buf, int count); 174 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); 175 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, 176 const void *buf, int count); 177 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, 178 int nb_sectors, QEMUIOVector *qiov); 179 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, 180 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 181 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 182 int nb_sectors, QEMUIOVector *qiov); 183 /* 184 * Efficiently zero a region of the disk image. Note that this is a regular 185 * I/O request like read or write and should have a reasonable size. This 186 * function is not suitable for zeroing the entire image in a single request 187 * because it may allocate memory for the entire region. 188 */ 189 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 190 int nb_sectors); 191 int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, 192 int nb_sectors, int *pnum); 193 int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, 194 BlockDriverState *base, 195 int64_t sector_num, 196 int nb_sectors, int *pnum); 197 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 198 const char *backing_file); 199 int bdrv_get_backing_file_depth(BlockDriverState *bs); 200 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 201 int64_t bdrv_getlength(BlockDriverState *bs); 202 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 203 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 204 int bdrv_commit(BlockDriverState *bs); 205 int bdrv_commit_all(void); 206 int bdrv_change_backing_file(BlockDriverState *bs, 207 const char *backing_file, const char *backing_fmt); 208 void bdrv_register(BlockDriver *bdrv); 209 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 210 BlockDriverState *base); 211 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 212 BlockDriverState *bs); 213 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 214 215 216 typedef struct BdrvCheckResult { 217 int corruptions; 218 int leaks; 219 int check_errors; 220 int corruptions_fixed; 221 int leaks_fixed; 222 int64_t image_end_offset; 223 BlockFragInfo bfi; 224 } BdrvCheckResult; 225 226 typedef enum { 227 BDRV_FIX_LEAKS = 1, 228 BDRV_FIX_ERRORS = 2, 229 } BdrvCheckMode; 230 231 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 232 233 /* async block I/O */ 234 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector, 235 int sector_num); 236 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 237 QEMUIOVector *iov, int nb_sectors, 238 BlockDriverCompletionFunc *cb, void *opaque); 239 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 240 QEMUIOVector *iov, int nb_sectors, 241 BlockDriverCompletionFunc *cb, void *opaque); 242 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, 243 BlockDriverCompletionFunc *cb, void *opaque); 244 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, 245 int64_t sector_num, int nb_sectors, 246 BlockDriverCompletionFunc *cb, void *opaque); 247 void bdrv_aio_cancel(BlockDriverAIOCB *acb); 248 249 typedef struct BlockRequest { 250 /* Fields to be filled by multiwrite caller */ 251 int64_t sector; 252 int nb_sectors; 253 QEMUIOVector *qiov; 254 BlockDriverCompletionFunc *cb; 255 void *opaque; 256 257 /* Filled by multiwrite implementation */ 258 int error; 259 } BlockRequest; 260 261 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, 262 int num_reqs); 263 264 /* sg packet commands */ 265 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 266 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 267 unsigned long int req, void *buf, 268 BlockDriverCompletionFunc *cb, void *opaque); 269 270 /* Invalidate any cached metadata used by image formats */ 271 void bdrv_invalidate_cache(BlockDriverState *bs); 272 void bdrv_invalidate_cache_all(void); 273 274 void bdrv_clear_incoming_migration_all(void); 275 276 /* Ensure contents are flushed to disk. */ 277 int bdrv_flush(BlockDriverState *bs); 278 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 279 void bdrv_flush_all(void); 280 void bdrv_close_all(void); 281 void bdrv_drain_all(void); 282 283 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 284 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 285 int bdrv_has_zero_init(BlockDriverState *bs); 286 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 287 int *pnum); 288 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 289 int64_t sector_num, int nb_sectors, int *pnum); 290 291 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, 292 BlockdevOnError on_write_error); 293 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read); 294 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error); 295 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, 296 bool is_read, int error); 297 int bdrv_is_read_only(BlockDriverState *bs); 298 int bdrv_is_sg(BlockDriverState *bs); 299 int bdrv_enable_write_cache(BlockDriverState *bs); 300 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce); 301 int bdrv_is_inserted(BlockDriverState *bs); 302 int bdrv_media_changed(BlockDriverState *bs); 303 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 304 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 305 const char *bdrv_get_format_name(BlockDriverState *bs); 306 BlockDriverState *bdrv_find(const char *name); 307 BlockDriverState *bdrv_next(BlockDriverState *bs); 308 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), 309 void *opaque); 310 int bdrv_is_encrypted(BlockDriverState *bs); 311 int bdrv_key_required(BlockDriverState *bs); 312 int bdrv_set_key(BlockDriverState *bs, const char *key); 313 int bdrv_query_missing_keys(void); 314 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 315 void *opaque); 316 const char *bdrv_get_device_name(BlockDriverState *bs); 317 int bdrv_get_flags(BlockDriverState *bs); 318 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, 319 const uint8_t *buf, int nb_sectors); 320 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 321 void bdrv_round_to_clusters(BlockDriverState *bs, 322 int64_t sector_num, int nb_sectors, 323 int64_t *cluster_sector_num, 324 int *cluster_nb_sectors); 325 326 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 327 void bdrv_get_backing_filename(BlockDriverState *bs, 328 char *filename, int filename_size); 329 void bdrv_get_full_backing_filename(BlockDriverState *bs, 330 char *dest, size_t sz); 331 BlockInfo *bdrv_query_info(BlockDriverState *s); 332 BlockStats *bdrv_query_stats(const BlockDriverState *bs); 333 int bdrv_can_snapshot(BlockDriverState *bs); 334 int bdrv_is_snapshot(BlockDriverState *bs); 335 BlockDriverState *bdrv_snapshots(void); 336 int bdrv_snapshot_create(BlockDriverState *bs, 337 QEMUSnapshotInfo *sn_info); 338 int bdrv_snapshot_goto(BlockDriverState *bs, 339 const char *snapshot_id); 340 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id); 341 int bdrv_snapshot_list(BlockDriverState *bs, 342 QEMUSnapshotInfo **psn_info); 343 int bdrv_snapshot_load_tmp(BlockDriverState *bs, 344 const char *snapshot_name); 345 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn); 346 347 char *get_human_readable_size(char *buf, int buf_size, int64_t size); 348 int path_is_absolute(const char *path); 349 void path_combine(char *dest, int dest_size, 350 const char *base_path, 351 const char *filename); 352 353 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 354 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 355 int64_t pos, int size); 356 357 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 358 int64_t pos, int size); 359 360 void bdrv_img_create(const char *filename, const char *fmt, 361 const char *base_filename, const char *base_fmt, 362 char *options, uint64_t img_size, int flags, 363 Error **errp, bool quiet); 364 365 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align); 366 void *qemu_blockalign(BlockDriverState *bs, size_t size); 367 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 368 369 struct HBitmapIter; 370 void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity); 371 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector); 372 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors); 373 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors); 374 void bdrv_dirty_iter_init(BlockDriverState *bs, struct HBitmapIter *hbi); 375 int64_t bdrv_get_dirty_count(BlockDriverState *bs); 376 377 void bdrv_enable_copy_on_read(BlockDriverState *bs); 378 void bdrv_disable_copy_on_read(BlockDriverState *bs); 379 380 void bdrv_set_in_use(BlockDriverState *bs, int in_use); 381 int bdrv_in_use(BlockDriverState *bs); 382 383 #ifdef CONFIG_LINUX_AIO 384 int raw_get_aio_fd(BlockDriverState *bs); 385 #else 386 static inline int raw_get_aio_fd(BlockDriverState *bs) 387 { 388 return -ENOTSUP; 389 } 390 #endif 391 392 enum BlockAcctType { 393 BDRV_ACCT_READ, 394 BDRV_ACCT_WRITE, 395 BDRV_ACCT_FLUSH, 396 BDRV_MAX_IOTYPE, 397 }; 398 399 typedef struct BlockAcctCookie { 400 int64_t bytes; 401 int64_t start_time_ns; 402 enum BlockAcctType type; 403 } BlockAcctCookie; 404 405 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, 406 int64_t bytes, enum BlockAcctType type); 407 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie); 408 409 typedef enum { 410 BLKDBG_L1_UPDATE, 411 412 BLKDBG_L1_GROW_ALLOC_TABLE, 413 BLKDBG_L1_GROW_WRITE_TABLE, 414 BLKDBG_L1_GROW_ACTIVATE_TABLE, 415 416 BLKDBG_L2_LOAD, 417 BLKDBG_L2_UPDATE, 418 BLKDBG_L2_UPDATE_COMPRESSED, 419 BLKDBG_L2_ALLOC_COW_READ, 420 BLKDBG_L2_ALLOC_WRITE, 421 422 BLKDBG_READ_AIO, 423 BLKDBG_READ_BACKING_AIO, 424 BLKDBG_READ_COMPRESSED, 425 426 BLKDBG_WRITE_AIO, 427 BLKDBG_WRITE_COMPRESSED, 428 429 BLKDBG_VMSTATE_LOAD, 430 BLKDBG_VMSTATE_SAVE, 431 432 BLKDBG_COW_READ, 433 BLKDBG_COW_WRITE, 434 435 BLKDBG_REFTABLE_LOAD, 436 BLKDBG_REFTABLE_GROW, 437 438 BLKDBG_REFBLOCK_LOAD, 439 BLKDBG_REFBLOCK_UPDATE, 440 BLKDBG_REFBLOCK_UPDATE_PART, 441 BLKDBG_REFBLOCK_ALLOC, 442 BLKDBG_REFBLOCK_ALLOC_HOOKUP, 443 BLKDBG_REFBLOCK_ALLOC_WRITE, 444 BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS, 445 BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE, 446 BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE, 447 448 BLKDBG_CLUSTER_ALLOC, 449 BLKDBG_CLUSTER_ALLOC_BYTES, 450 BLKDBG_CLUSTER_FREE, 451 452 BLKDBG_EVENT_MAX, 453 } BlkDebugEvent; 454 455 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt) 456 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event); 457 458 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 459 const char *tag); 460 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 461 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 462 463 #endif 464