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
  10 /* block.c */
  11 typedef struct BlockDriver BlockDriver;
  12
  13 typedef struct BlockDriverInfo {
  14     /* in bytes, 0 if irrelevant */
  15     int cluster_size;
  16     /* offset at which the VM state can be saved (0 if not possible) */
  17     int64_t vm_state_offset;
  18 } BlockDriverInfo;
  19
  20 typedef struct QEMUSnapshotInfo {
  21     char id_str[128]; /* unique snapshot id */
  22     /* the following fields are informative. They are not needed for
  23        the consistency of the snapshot */
  24     char name[256]; /* user choosen name */
  25     uint32_t vm_state_size; /* VM state info size */
  26     uint32_t date_sec; /* UTC date of the snapshot */
  27     uint32_t date_nsec;
  28     uint64_t vm_clock_nsec; /* VM clock relative to boot */
  29 } QEMUSnapshotInfo;
  30
  31 /* Callbacks for block device models */
  32 typedef struct BlockDevOps {
  33     /*
  34      * Runs when virtual media changed (monitor commands eject, change)
  35      * Argument load is true on load and false on eject.
  36      * Beware: doesn't run when a host device's physical media
  37      * changes.  Sure would be useful if it did.
  38      * Device models with removable media must implement this callback.
  39      */
  40     void (*change_media_cb)(void *opaque, bool load);
  41     /*
  42      * Is the virtual tray open?
  43      * Device models implement this only when the device has a tray.
  44      */
  45     bool (*is_tray_open)(void *opaque);
  46     /*
  47      * Is the virtual medium locked into the device?
  48      * Device models implement this only when device has such a lock.
  49      */
  50     bool (*is_medium_locked)(void *opaque);
  51     /*
  52      * Runs when the size changed (e.g. monitor command block_resize)
  53      */
  54     void (*resize_cb)(void *opaque);
  55 } BlockDevOps;
  56
  57 #define BDRV_O_RDWR        0x0002
  58 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  59 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  60 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  61 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  62 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  63 #define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
  64
  65 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
  66
  67 #define BDRV_SECTOR_BITS   9
  68 #define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
  69 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)
  70
  71 typedef enum {
  72     BLOCK_ERR_REPORT, BLOCK_ERR_IGNORE, BLOCK_ERR_STOP_ENOSPC,
  73     BLOCK_ERR_STOP_ANY
  74 } BlockErrorAction;
  75
  76 typedef enum {
  77     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
  78 } BlockMonEventAction;
  79
  80 typedef enum {
  81     BDRV_IOS_INVAL, BDRV_IOS_OK, BDRV_IOS_FAILED, BDRV_IOS_ENOSPC,
  82     BDRV_IOS_MAX
  83 } BlockIOStatus;
  84
  85 void bdrv_iostatus_enable(BlockDriverState *bs);
  86 void bdrv_iostatus_reset(BlockDriverState *bs);
  87 void bdrv_iostatus_disable(BlockDriverState *bs);
  88 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
  89 void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
  90 void bdrv_mon_event(const BlockDriverState *bdrv,
  91                     BlockMonEventAction action, int is_read);
  92 void bdrv_info_print(Monitor *mon, const QObject *data);
  93 void bdrv_info(Monitor *mon, QObject **ret_data);
  94 void bdrv_stats_print(Monitor *mon, const QObject *data);
  95 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
  96
  97 void bdrv_init(void);
  98 void bdrv_init_with_whitelist(void);
  99 BlockDriver *bdrv_find_protocol(const char *filename);
 100 BlockDriver *bdrv_find_format(const char *format_name);
 101 BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
 102 int bdrv_create(BlockDriver *drv, const char* filename,
 103     QEMUOptionParameter *options);
 104 int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
 105 BlockDriverState *bdrv_new(const char *device_name);
 106 void bdrv_make_anon(BlockDriverState *bs);
 107 void bdrv_delete(BlockDriverState *bs);
 108 int bdrv_parse_cache_flags(const char *mode, int *flags);
 109 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
 110 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
 111               BlockDriver *drv);
 112 void bdrv_close(BlockDriverState *bs);
 113 int bdrv_attach_dev(BlockDriverState *bs, void *dev);
 114 void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
 115 void bdrv_detach_dev(BlockDriverState *bs, void *dev);
 116 void *bdrv_get_attached_dev(BlockDriverState *bs);
 117 void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
 118                       void *opaque);
 119 bool bdrv_dev_has_removable_media(BlockDriverState *bs);
 120 bool bdrv_dev_is_tray_open(BlockDriverState *bs);
 121 bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
 122 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 123               uint8_t *buf, int nb_sectors);
 124 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 125                const uint8_t *buf, int nb_sectors);
 126 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 127                void *buf, int count);
 128 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 129                 const void *buf, int count);
 130 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
 131     const void *buf, int count);
 132 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
 133     int nb_sectors, QEMUIOVector *qiov);
 134 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
 135     int nb_sectors, QEMUIOVector *qiov);
 136 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 137 int64_t bdrv_getlength(BlockDriverState *bs);
 138 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
 139 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 140 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
 141 int bdrv_commit(BlockDriverState *bs);
 142 void bdrv_commit_all(void);
 143 int bdrv_change_backing_file(BlockDriverState *bs,
 144     const char *backing_file, const char *backing_fmt);
 145 void bdrv_register(BlockDriver *bdrv);
 146
 147
 148 typedef struct BdrvCheckResult {
 149     int corruptions;
 150     int leaks;
 151     int check_errors;
 152 } BdrvCheckResult;
 153
 154 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res);
 155
 156 /* async block I/O */
 157 typedef struct BlockDriverAIOCB BlockDriverAIOCB;
 158 typedef void BlockDriverCompletionFunc(void *opaque, int ret);
 159 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
 160                                      int sector_num);
 161 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
 162                                  QEMUIOVector *iov, int nb_sectors,
 163                                  BlockDriverCompletionFunc *cb, void *opaque);
 164 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 165                                   QEMUIOVector *iov, int nb_sectors,
 166                                   BlockDriverCompletionFunc *cb, void *opaque);
 167 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 168                                  BlockDriverCompletionFunc *cb, void *opaque);
 169 BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
 170                                    int64_t sector_num, int nb_sectors,
 171                                    BlockDriverCompletionFunc *cb, void *opaque);
 172 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 173
 174 typedef struct BlockRequest {
 175     /* Fields to be filled by multiwrite caller */
 176     int64_t sector;
 177     int nb_sectors;
 178     QEMUIOVector *qiov;
 179     BlockDriverCompletionFunc *cb;
 180     void *opaque;
 181
 182     /* Filled by multiwrite implementation */
 183     int error;
 184 } BlockRequest;
 185
 186 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 187     int num_reqs);
 188
 189 /* sg packet commands */
 190 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 191 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 192         unsigned long int req, void *buf,
 193         BlockDriverCompletionFunc *cb, void *opaque);
 194
 195 /* Ensure contents are flushed to disk.  */
 196 int bdrv_flush(BlockDriverState *bs);
 197 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 198 void bdrv_flush_all(void);
 199 void bdrv_close_all(void);
 200
 201 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 202 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 203 int bdrv_has_zero_init(BlockDriverState *bs);
 204 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 205                       int *pnum);
 206
 207 #define BIOS_ATA_TRANSLATION_AUTO   0
 208 #define BIOS_ATA_TRANSLATION_NONE   1
 209 #define BIOS_ATA_TRANSLATION_LBA    2
 210 #define BIOS_ATA_TRANSLATION_LARGE  3
 211 #define BIOS_ATA_TRANSLATION_RECHS  4
 212
 213 void bdrv_set_geometry_hint(BlockDriverState *bs,
 214                             int cyls, int heads, int secs);
 215 void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
 216 void bdrv_get_geometry_hint(BlockDriverState *bs,
 217                             int *pcyls, int *pheads, int *psecs);
 218 typedef enum FDriveType {
 219     FDRIVE_DRV_144  = 0x00,   /* 1.44 MB 3"5 drive      */
 220     FDRIVE_DRV_288  = 0x01,   /* 2.88 MB 3"5 drive      */
 221     FDRIVE_DRV_120  = 0x02,   /* 1.2  MB 5"25 drive     */
 222     FDRIVE_DRV_NONE = 0x03,   /* No drive connected     */
 223 } FDriveType;
 224
 225 void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
 226                                    int *max_track, int *last_sect,
 227                                    FDriveType drive_in, FDriveType *drive);
 228 int bdrv_get_translation_hint(BlockDriverState *bs);
 229 void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
 230                        BlockErrorAction on_write_error);
 231 BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
 232 int bdrv_is_read_only(BlockDriverState *bs);
 233 int bdrv_is_sg(BlockDriverState *bs);
 234 int bdrv_enable_write_cache(BlockDriverState *bs);
 235 int bdrv_is_inserted(BlockDriverState *bs);
 236 int bdrv_media_changed(BlockDriverState *bs);
 237 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 238 void bdrv_eject(BlockDriverState *bs, int eject_flag);
 239 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
 240 BlockDriverState *bdrv_find(const char *name);
 241 BlockDriverState *bdrv_next(BlockDriverState *bs);
 242 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 243                   void *opaque);
 244 int bdrv_is_encrypted(BlockDriverState *bs);
 245 int bdrv_key_required(BlockDriverState *bs);
 246 int bdrv_set_key(BlockDriverState *bs, const char *key);
 247 int bdrv_query_missing_keys(void);
 248 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 249                          void *opaque);
 250 const char *bdrv_get_device_name(BlockDriverState *bs);
 251 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 252                           const uint8_t *buf, int nb_sectors);
 253 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 254
 255 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 256 void bdrv_get_backing_filename(BlockDriverState *bs,
 257                                char *filename, int filename_size);
 258 int bdrv_can_snapshot(BlockDriverState *bs);
 259 int bdrv_is_snapshot(BlockDriverState *bs);
 260 BlockDriverState *bdrv_snapshots(void);
 261 int bdrv_snapshot_create(BlockDriverState *bs,
 262                          QEMUSnapshotInfo *sn_info);
 263 int bdrv_snapshot_goto(BlockDriverState *bs,
 264                        const char *snapshot_id);
 265 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
 266 int bdrv_snapshot_list(BlockDriverState *bs,
 267                        QEMUSnapshotInfo **psn_info);
 268 int bdrv_snapshot_load_tmp(BlockDriverState *bs,
 269                            const char *snapshot_name);
 270 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
 271
 272 char *get_human_readable_size(char *buf, int buf_size, int64_t size);
 273 int path_is_absolute(const char *path);
 274 void path_combine(char *dest, int dest_size,
 275                   const char *base_path,
 276                   const char *filename);
 277
 278 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 279                       int64_t pos, int size);
 280
 281 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 282                       int64_t pos, int size);
 283
 284 int bdrv_img_create(const char *filename, const char *fmt,
 285                     const char *base_filename, const char *base_fmt,
 286                     char *options, uint64_t img_size, int flags);
 287
 288 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
 289 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 290
 291 #define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
 292
 293 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
 294 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 295 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
 296                       int nr_sectors);
 297 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 298
 299 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 300 int bdrv_in_use(BlockDriverState *bs);
 301
 302 enum BlockAcctType {
 303     BDRV_ACCT_READ,
 304     BDRV_ACCT_WRITE,
 305     BDRV_ACCT_FLUSH,
 306     BDRV_MAX_IOTYPE,
 307 };
 308
 309 typedef struct BlockAcctCookie {
 310     int64_t bytes;
 311     int64_t start_time_ns;
 312     enum BlockAcctType type;
 313 } BlockAcctCookie;
 314
 315 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 316         int64_t bytes, enum BlockAcctType type);
 317 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 318
 319 typedef enum {
 320     BLKDBG_L1_UPDATE,
 321
 322     BLKDBG_L1_GROW_ALLOC_TABLE,
 323     BLKDBG_L1_GROW_WRITE_TABLE,
 324     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 325
 326     BLKDBG_L2_LOAD,
 327     BLKDBG_L2_UPDATE,
 328     BLKDBG_L2_UPDATE_COMPRESSED,
 329     BLKDBG_L2_ALLOC_COW_READ,
 330     BLKDBG_L2_ALLOC_WRITE,
 331
 332     BLKDBG_READ,
 333     BLKDBG_READ_AIO,
 334     BLKDBG_READ_BACKING,
 335     BLKDBG_READ_BACKING_AIO,
 336     BLKDBG_READ_COMPRESSED,
 337
 338     BLKDBG_WRITE_AIO,
 339     BLKDBG_WRITE_COMPRESSED,
 340
 341     BLKDBG_VMSTATE_LOAD,
 342     BLKDBG_VMSTATE_SAVE,
 343
 344     BLKDBG_COW_READ,
 345     BLKDBG_COW_WRITE,
 346
 347     BLKDBG_REFTABLE_LOAD,
 348     BLKDBG_REFTABLE_GROW,
 349
 350     BLKDBG_REFBLOCK_LOAD,
 351     BLKDBG_REFBLOCK_UPDATE,
 352     BLKDBG_REFBLOCK_UPDATE_PART,
 353     BLKDBG_REFBLOCK_ALLOC,
 354     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 355     BLKDBG_REFBLOCK_ALLOC_WRITE,
 356     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 357     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 358     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 359
 360     BLKDBG_CLUSTER_ALLOC,
 361     BLKDBG_CLUSTER_ALLOC_BYTES,
 362     BLKDBG_CLUSTER_FREE,
 363
 364     BLKDBG_EVENT_MAX,
 365 } BlkDebugEvent;
 366
 367 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 368 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 369
 370
 371 /* Convenience for block device models */
 372
 373 typedef struct BlockConf {
 374     BlockDriverState *bs;
 375     uint16_t physical_block_size;
 376     uint16_t logical_block_size;
 377     uint16_t min_io_size;
 378     uint32_t opt_io_size;
 379     int32_t bootindex;
 380     uint32_t discard_granularity;
 381 } BlockConf;
 382
 383 static inline unsigned int get_physical_block_exp(BlockConf *conf)
 384 {
 385     unsigned int exp = 0, size;
 386
 387     for (size = conf->physical_block_size;
 388         size > conf->logical_block_size;
 389         size >>= 1) {
 390         exp++;
 391     }
 392
 393     return exp;
 394 }
 395
 396 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
 397     DEFINE_PROP_DRIVE("drive", _state, _conf.bs),                       \
 398     DEFINE_PROP_UINT16("logical_block_size", _state,                    \
 399                        _conf.logical_block_size, 512),                  \
 400     DEFINE_PROP_UINT16("physical_block_size", _state,                   \
 401                        _conf.physical_block_size, 512),                 \
 402     DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
 403     DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
 404     DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1),        \
 405     DEFINE_PROP_UINT32("discard_granularity", _state, \
 406                        _conf.discard_granularity, 0)
 407
 408 #endif
 409