block.h

   1 #ifndef BLOCK_H
   2 #define BLOCK_H
   3
   4 #include "qemu-aio.h"
   5 #include "qemu-common.h"
   6 #include "qemu-option.h"
   7 #include "qemu-coroutine.h"
   8 #include "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 } BlockFragInfo;
  28
  29 typedef struct QEMUSnapshotInfo {
  30     char id_str[128]; /* unique snapshot id */
  31     /* the following fields are informative. They are not needed for
  32        the consistency of the snapshot */
  33     char name[256]; /* user chosen name */
  34     uint64_t vm_state_size; /* VM state info size */
  35     uint32_t date_sec; /* UTC date of the snapshot */
  36     uint32_t date_nsec;
  37     uint64_t vm_clock_nsec; /* VM clock relative to boot */
  38 } QEMUSnapshotInfo;
  39
  40 /* Callbacks for block device models */
  41 typedef struct BlockDevOps {
  42     /*
  43      * Runs when virtual media changed (monitor commands eject, change)
  44      * Argument load is true on load and false on eject.
  45      * Beware: doesn't run when a host device's physical media
  46      * changes.  Sure would be useful if it did.
  47      * Device models with removable media must implement this callback.
  48      */
  49     void (*change_media_cb)(void *opaque, bool load);
  50     /*
  51      * Runs when an eject request is issued from the monitor, the tray
  52      * is closed, and the medium is locked.
  53      * Device models that do not implement is_medium_locked will not need
  54      * this callback.  Device models that can lock the medium or tray might
  55      * want to implement the callback and unlock the tray when "force" is
  56      * true, even if they do not support eject requests.
  57      */
  58     void (*eject_request_cb)(void *opaque, bool force);
  59     /*
  60      * Is the virtual tray open?
  61      * Device models implement this only when the device has a tray.
  62      */
  63     bool (*is_tray_open)(void *opaque);
  64     /*
  65      * Is the virtual medium locked into the device?
  66      * Device models implement this only when device has such a lock.
  67      */
  68     bool (*is_medium_locked)(void *opaque);
  69     /*
  70      * Runs when the size changed (e.g. monitor command block_resize)
  71      */
  72     void (*resize_cb)(void *opaque);
  73 } BlockDevOps;
  74
  75 #define BDRV_O_RDWR        0x0002
  76 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  77 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  78 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  79 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  80 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  81 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
  82 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
  83 #define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */
  84 #define BDRV_O_CHECK       0x1000  /* open solely for consistency check */
  85 #define BDRV_O_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */
  86
  87 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
  88
  89 #define BDRV_SECTOR_BITS   9
  90 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
  91 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
  92
  93 typedef enum {
  94     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
  95 } BlockErrorAction;
  96
  97 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
  98
  99 typedef struct BDRVReopenState {
 100     BlockDriverState *bs;
 101     int flags;
 102     void *opaque;
 103 } BDRVReopenState;
 104
 105
 106 void bdrv_iostatus_enable(BlockDriverState *bs);
 107 void bdrv_iostatus_reset(BlockDriverState *bs);
 108 void bdrv_iostatus_disable(BlockDriverState *bs);
 109 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
 110 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
 111 void bdrv_info_print(Monitor *mon, const QObject *data);
 112 void bdrv_info(Monitor *mon, QObject **ret_data);
 113 void bdrv_stats_print(Monitor *mon, const QObject *data);
 114 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
 115
 116 /* disk I/O throttling */
 117 void bdrv_io_limits_enable(BlockDriverState *bs);
 118 void bdrv_io_limits_disable(BlockDriverState *bs);
 119 bool bdrv_io_limits_enabled(BlockDriverState *bs);
 120
 121 void bdrv_init(void);
 122 void bdrv_init_with_whitelist(void);
 123 BlockDriver *bdrv_find_protocol(const char *filename);
 124 BlockDriver *bdrv_find_format(const char *format_name);
 125 BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
 126 int bdrv_create(BlockDriver *drv, const char* filename,
 127     QEMUOptionParameter *options);
 128 int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
 129 BlockDriverState *bdrv_new(const char *device_name);
 130 void bdrv_make_anon(BlockDriverState *bs);
 131 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 132 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 133 void bdrv_delete(BlockDriverState *bs);
 134 int bdrv_parse_cache_flags(const char *mode, int *flags);
 135 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
 136 int bdrv_open_backing_file(BlockDriverState *bs);
 137 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
 138               BlockDriver *drv);
 139 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
 140                                     BlockDriverState *bs, int flags);
 141 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
 142 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
 143 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
 144                         BlockReopenQueue *queue, Error **errp);
 145 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
 146 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
 147 void bdrv_close(BlockDriverState *bs);
 148 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);
 149 int bdrv_attach_dev(BlockDriverState *bs, void *dev);
 150 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
 151 void bdrv_detach_dev(BlockDriverState *bs, void *dev);
 152 void *bdrv_get_attached_dev(BlockDriverState *bs);
 153 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
 154                       void *opaque);
 155 void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
 156 bool bdrv_dev_has_removable_media(BlockDriverState *bs);
 157 bool bdrv_dev_is_tray_open(BlockDriverState *bs);
 158 bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
 159 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 160               uint8_t *buf, int nb_sectors);
 161 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
 162                           uint8_t *buf, int nb_sectors);
 163 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 164                const uint8_t *buf, int nb_sectors);
 165 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 166                void *buf, int count);
 167 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 168                 const void *buf, int count);
 169 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 170     const void *buf, int count);
 171 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 172     int nb_sectors, QEMUIOVector *qiov);
 173 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
 174     int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
 175 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 176     int nb_sectors, QEMUIOVector *qiov);
 177 /*
 178  * Efficiently zero a region of the disk image.  Note that this is a regular
 179  * I/O request like read or write and should have a reasonable size.  This
 180  * function is not suitable for zeroing the entire image in a single request
 181  * because it may allocate memory for the entire region.
 182  */
 183 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
 184     int nb_sectors);
 185 int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
 186     int nb_sectors, int *pnum);
 187 int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
 188                                             BlockDriverState *base,
 189                                             int64_t sector_num,
 190                                             int nb_sectors, int *pnum);
 191 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
 192     const char *backing_file);
 193 int bdrv_get_backing_file_depth(BlockDriverState *bs);
 194 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 195 int64_t bdrv_getlength(BlockDriverState *bs);
 196 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 197 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 198 int bdrv_commit(BlockDriverState *bs);
 199 int bdrv_commit_all(void);
 200 int bdrv_change_backing_file(BlockDriverState *bs,
 201     const char *backing_file, const char *backing_fmt);
 202 void bdrv_register(BlockDriver *bdrv);
 203 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
 204                            BlockDriverState *base);
 205 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
 206                                     BlockDriverState *bs);
 207 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
 208
 209
 210 typedef struct BdrvCheckResult {
 211     int corruptions;
 212     int leaks;
 213     int check_errors;
 214     int corruptions_fixed;
 215     int leaks_fixed;
 216     BlockFragInfo bfi;
 217 } BdrvCheckResult;
 218
 219 typedef enum {
 220     BDRV_FIX_LEAKS    = 1,
 221     BDRV_FIX_ERRORS   = 2,
 222 } BdrvCheckMode;
 223
 224 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
 225
 226 /* async block I/O */
 227 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 228                                      int sector_num);
 229 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 230                                  QEMUIOVector *iov, int nb_sectors,
 231                                  BlockDriverCompletionFunc *cb, void *opaque);
 232 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 233                                   QEMUIOVector *iov, int nb_sectors,
 234                                   BlockDriverCompletionFunc *cb, void *opaque);
 235 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 236                                  BlockDriverCompletionFunc *cb, void *opaque);
 237 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 238                                    int64_t sector_num, int nb_sectors,
 239                                    BlockDriverCompletionFunc *cb, void *opaque);
 240 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 241
 242 typedef struct BlockRequest {
 243     /* Fields to be filled by multiwrite caller */
 244     int64_t sector;
 245     int nb_sectors;
 246     QEMUIOVector *qiov;
 247     BlockDriverCompletionFunc *cb;
 248     void *opaque;
 249
 250     /* Filled by multiwrite implementation */
 251     int error;
 252 } BlockRequest;
 253
 254 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 255     int num_reqs);
 256
 257 /* sg packet commands */
 258 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 259 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 260         unsigned long int req, void *buf,
 261         BlockDriverCompletionFunc *cb, void *opaque);
 262
 263 /* Invalidate any cached metadata used by image formats */
 264 void bdrv_invalidate_cache(BlockDriverState *bs);
 265 void bdrv_invalidate_cache_all(void);
 266
 267 void bdrv_clear_incoming_migration_all(void);
 268
 269 /* Ensure contents are flushed to disk.  */
 270 int bdrv_flush(BlockDriverState *bs);
 271 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 272 void bdrv_flush_all(void);
 273 void bdrv_close_all(void);
 274 void bdrv_drain_all(void);
 275
 276 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 277 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 278 int bdrv_has_zero_init(BlockDriverState *bs);
 279 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 280                       int *pnum);
 281
 282 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
 283                        BlockdevOnError on_write_error);
 284 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
 285 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
 286 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
 287                        bool is_read, int error);
 288 int bdrv_is_read_only(BlockDriverState *bs);
 289 int bdrv_is_sg(BlockDriverState *bs);
 290 int bdrv_enable_write_cache(BlockDriverState *bs);
 291 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 292 int bdrv_is_inserted(BlockDriverState *bs);
 293 int bdrv_media_changed(BlockDriverState *bs);
 294 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 295 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
 296 const char *bdrv_get_format_name(BlockDriverState *bs);
 297 BlockDriverState *bdrv_find(const char *name);
 298 BlockDriverState *bdrv_next(BlockDriverState *bs);
 299 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 300                   void *opaque);
 301 int bdrv_is_encrypted(BlockDriverState *bs);
 302 int bdrv_key_required(BlockDriverState *bs);
 303 int bdrv_set_key(BlockDriverState *bs, const char *key);
 304 int bdrv_query_missing_keys(void);
 305 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 306                          void *opaque);
 307 const char *bdrv_get_device_name(BlockDriverState *bs);
 308 int bdrv_get_flags(BlockDriverState *bs);
 309 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 310                           const uint8_t *buf, int nb_sectors);
 311 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 312
 313 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 314 void bdrv_get_backing_filename(BlockDriverState *bs,
 315                                char *filename, int filename_size);
 316 void bdrv_get_full_backing_filename(BlockDriverState *bs,
 317                                     char *dest, size_t sz);
 318 BlockInfo *bdrv_query_info(BlockDriverState *s);
 319 BlockStats *bdrv_query_stats(const BlockDriverState *bs);
 320 int bdrv_can_snapshot(BlockDriverState *bs);
 321 int bdrv_is_snapshot(BlockDriverState *bs);
 322 BlockDriverState *bdrv_snapshots(void);
 323 int bdrv_snapshot_create(BlockDriverState *bs,
 324                          QEMUSnapshotInfo *sn_info);
 325 int bdrv_snapshot_goto(BlockDriverState *bs,
 326                        const char *snapshot_id);
 327 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
 328 int bdrv_snapshot_list(BlockDriverState *bs,
 329                        QEMUSnapshotInfo **psn_info);
 330 int bdrv_snapshot_load_tmp(BlockDriverState *bs,
 331                            const char *snapshot_name);
 332 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
 333
 334 char *get_human_readable_size(char *buf, int buf_size, int64_t size);
 335 int path_is_absolute(const char *path);
 336 void path_combine(char *dest, int dest_size,
 337                   const char *base_path,
 338                   const char *filename);
 339
 340 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 341                       int64_t pos, int size);
 342
 343 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 344                       int64_t pos, int size);
 345
 346 int bdrv_img_create(const char *filename, const char *fmt,
 347                     const char *base_filename, const char *base_fmt,
 348                     char *options, uint64_t img_size, int flags);
 349
 350 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
 351 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 352
 353 #define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
 354
 355 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
 356 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 357 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 358 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 359 int64_t bdrv_get_next_dirty(BlockDriverState *bs, int64_t sector);
 360 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 361
 362 void bdrv_enable_copy_on_read(BlockDriverState *bs);
 363 void bdrv_disable_copy_on_read(BlockDriverState *bs);
 364
 365 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 366 int bdrv_in_use(BlockDriverState *bs);
 367
 368 enum BlockAcctType {
 369     BDRV_ACCT_READ,
 370     BDRV_ACCT_WRITE,
 371     BDRV_ACCT_FLUSH,
 372     BDRV_MAX_IOTYPE,
 373 };
 374
 375 typedef struct BlockAcctCookie {
 376     int64_t bytes;
 377     int64_t start_time_ns;
 378     enum BlockAcctType type;
 379 } BlockAcctCookie;
 380
 381 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 382         int64_t bytes, enum BlockAcctType type);
 383 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 384
 385 typedef enum {
 386     BLKDBG_L1_UPDATE,
 387
 388     BLKDBG_L1_GROW_ALLOC_TABLE,
 389     BLKDBG_L1_GROW_WRITE_TABLE,
 390     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 391
 392     BLKDBG_L2_LOAD,
 393     BLKDBG_L2_UPDATE,
 394     BLKDBG_L2_UPDATE_COMPRESSED,
 395     BLKDBG_L2_ALLOC_COW_READ,
 396     BLKDBG_L2_ALLOC_WRITE,
 397
 398     BLKDBG_READ_AIO,
 399     BLKDBG_READ_BACKING_AIO,
 400     BLKDBG_READ_COMPRESSED,
 401
 402     BLKDBG_WRITE_AIO,
 403     BLKDBG_WRITE_COMPRESSED,
 404
 405     BLKDBG_VMSTATE_LOAD,
 406     BLKDBG_VMSTATE_SAVE,
 407
 408     BLKDBG_COW_READ,
 409     BLKDBG_COW_WRITE,
 410
 411     BLKDBG_REFTABLE_LOAD,
 412     BLKDBG_REFTABLE_GROW,
 413
 414     BLKDBG_REFBLOCK_LOAD,
 415     BLKDBG_REFBLOCK_UPDATE,
 416     BLKDBG_REFBLOCK_UPDATE_PART,
 417     BLKDBG_REFBLOCK_ALLOC,
 418     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 419     BLKDBG_REFBLOCK_ALLOC_WRITE,
 420     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 421     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 422     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 423
 424     BLKDBG_CLUSTER_ALLOC,
 425     BLKDBG_CLUSTER_ALLOC_BYTES,
 426     BLKDBG_CLUSTER_FREE,
 427
 428     BLKDBG_EVENT_MAX,
 429 } BlkDebugEvent;
 430
 431 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 432 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 433
 434 #endif