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 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 170
 171 typedef struct BlockRequest {
 172     /* Fields to be filled by multiwrite caller */
 173     int64_t sector;
 174     int nb_sectors;
 175     QEMUIOVector *qiov;
 176     BlockDriverCompletionFunc *cb;
 177     void *opaque;
 178
 179     /* Filled by multiwrite implementation */
 180     int error;
 181 } BlockRequest;
 182
 183 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 184     int num_reqs);
 185
 186 /* sg packet commands */
 187 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 188 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 189         unsigned long int req, void *buf,
 190         BlockDriverCompletionFunc *cb, void *opaque);
 191
 192 /* Ensure contents are flushed to disk.  */
 193 int bdrv_flush(BlockDriverState *bs);
 194 void bdrv_flush_all(void);
 195 void bdrv_close_all(void);
 196
 197 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
 198 int bdrv_has_zero_init(BlockDriverState *bs);
 199 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 200                       int *pnum);
 201
 202 #define BIOS_ATA_TRANSLATION_AUTO   0
 203 #define BIOS_ATA_TRANSLATION_NONE   1
 204 #define BIOS_ATA_TRANSLATION_LBA    2
 205 #define BIOS_ATA_TRANSLATION_LARGE  3
 206 #define BIOS_ATA_TRANSLATION_RECHS  4
 207
 208 void bdrv_set_geometry_hint(BlockDriverState *bs,
 209                             int cyls, int heads, int secs);
 210 void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
 211 void bdrv_get_geometry_hint(BlockDriverState *bs,
 212                             int *pcyls, int *pheads, int *psecs);
 213 typedef enum FDriveType {
 214     FDRIVE_DRV_144  = 0x00,   /* 1.44 MB 3"5 drive      */
 215     FDRIVE_DRV_288  = 0x01,   /* 2.88 MB 3"5 drive      */
 216     FDRIVE_DRV_120  = 0x02,   /* 1.2  MB 5"25 drive     */
 217     FDRIVE_DRV_NONE = 0x03,   /* No drive connected     */
 218 } FDriveType;
 219
 220 void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
 221                                    int *max_track, int *last_sect,
 222                                    FDriveType drive_in, FDriveType *drive);
 223 int bdrv_get_translation_hint(BlockDriverState *bs);
 224 void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
 225                        BlockErrorAction on_write_error);
 226 BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
 227 int bdrv_is_read_only(BlockDriverState *bs);
 228 int bdrv_is_sg(BlockDriverState *bs);
 229 int bdrv_enable_write_cache(BlockDriverState *bs);
 230 int bdrv_is_inserted(BlockDriverState *bs);
 231 int bdrv_media_changed(BlockDriverState *bs);
 232 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
 233 void bdrv_eject(BlockDriverState *bs, int eject_flag);
 234 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
 235 BlockDriverState *bdrv_find(const char *name);
 236 BlockDriverState *bdrv_next(BlockDriverState *bs);
 237 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 238                   void *opaque);
 239 int bdrv_is_encrypted(BlockDriverState *bs);
 240 int bdrv_key_required(BlockDriverState *bs);
 241 int bdrv_set_key(BlockDriverState *bs, const char *key);
 242 int bdrv_query_missing_keys(void);
 243 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 244                          void *opaque);
 245 const char *bdrv_get_device_name(BlockDriverState *bs);
 246 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 247                           const uint8_t *buf, int nb_sectors);
 248 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 249
 250 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 251 void bdrv_get_backing_filename(BlockDriverState *bs,
 252                                char *filename, int filename_size);
 253 int bdrv_can_snapshot(BlockDriverState *bs);
 254 int bdrv_is_snapshot(BlockDriverState *bs);
 255 BlockDriverState *bdrv_snapshots(void);
 256 int bdrv_snapshot_create(BlockDriverState *bs,
 257                          QEMUSnapshotInfo *sn_info);
 258 int bdrv_snapshot_goto(BlockDriverState *bs,
 259                        const char *snapshot_id);
 260 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
 261 int bdrv_snapshot_list(BlockDriverState *bs,
 262                        QEMUSnapshotInfo **psn_info);
 263 int bdrv_snapshot_load_tmp(BlockDriverState *bs,
 264                            const char *snapshot_name);
 265 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
 266
 267 char *get_human_readable_size(char *buf, int buf_size, int64_t size);
 268 int path_is_absolute(const char *path);
 269 void path_combine(char *dest, int dest_size,
 270                   const char *base_path,
 271                   const char *filename);
 272
 273 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 274                       int64_t pos, int size);
 275
 276 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 277                       int64_t pos, int size);
 278
 279 int bdrv_img_create(const char *filename, const char *fmt,
 280                     const char *base_filename, const char *base_fmt,
 281                     char *options, uint64_t img_size, int flags);
 282
 283 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
 284 void *qemu_blockalign(BlockDriverState *bs, size_t size);
 285
 286 #define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
 287
 288 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
 289 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 290 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
 291                       int nr_sectors);
 292 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 293
 294 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 295 int bdrv_in_use(BlockDriverState *bs);
 296
 297 enum BlockAcctType {
 298     BDRV_ACCT_READ,
 299     BDRV_ACCT_WRITE,
 300     BDRV_ACCT_FLUSH,
 301     BDRV_MAX_IOTYPE,
 302 };
 303
 304 typedef struct BlockAcctCookie {
 305     int64_t bytes;
 306     int64_t start_time_ns;
 307     enum BlockAcctType type;
 308 } BlockAcctCookie;
 309
 310 void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
 311         int64_t bytes, enum BlockAcctType type);
 312 void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
 313
 314 typedef enum {
 315     BLKDBG_L1_UPDATE,
 316
 317     BLKDBG_L1_GROW_ALLOC_TABLE,
 318     BLKDBG_L1_GROW_WRITE_TABLE,
 319     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 320
 321     BLKDBG_L2_LOAD,
 322     BLKDBG_L2_UPDATE,
 323     BLKDBG_L2_UPDATE_COMPRESSED,
 324     BLKDBG_L2_ALLOC_COW_READ,
 325     BLKDBG_L2_ALLOC_WRITE,
 326
 327     BLKDBG_READ,
 328     BLKDBG_READ_AIO,
 329     BLKDBG_READ_BACKING,
 330     BLKDBG_READ_BACKING_AIO,
 331     BLKDBG_READ_COMPRESSED,
 332
 333     BLKDBG_WRITE_AIO,
 334     BLKDBG_WRITE_COMPRESSED,
 335
 336     BLKDBG_VMSTATE_LOAD,
 337     BLKDBG_VMSTATE_SAVE,
 338
 339     BLKDBG_COW_READ,
 340     BLKDBG_COW_WRITE,
 341
 342     BLKDBG_REFTABLE_LOAD,
 343     BLKDBG_REFTABLE_GROW,
 344
 345     BLKDBG_REFBLOCK_LOAD,
 346     BLKDBG_REFBLOCK_UPDATE,
 347     BLKDBG_REFBLOCK_UPDATE_PART,
 348     BLKDBG_REFBLOCK_ALLOC,
 349     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 350     BLKDBG_REFBLOCK_ALLOC_WRITE,
 351     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 352     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 353     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 354
 355     BLKDBG_CLUSTER_ALLOC,
 356     BLKDBG_CLUSTER_ALLOC_BYTES,
 357     BLKDBG_CLUSTER_FREE,
 358
 359     BLKDBG_EVENT_MAX,
 360 } BlkDebugEvent;
 361
 362 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 363 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 364
 365
 366 /* Convenience for block device models */
 367
 368 typedef struct BlockConf {
 369     BlockDriverState *bs;
 370     uint16_t physical_block_size;
 371     uint16_t logical_block_size;
 372     uint16_t min_io_size;
 373     uint32_t opt_io_size;
 374     int32_t bootindex;
 375     uint32_t discard_granularity;
 376 } BlockConf;
 377
 378 static inline unsigned int get_physical_block_exp(BlockConf *conf)
 379 {
 380     unsigned int exp = 0, size;
 381
 382     for (size = conf->physical_block_size;
 383         size > conf->logical_block_size;
 384         size >>= 1) {
 385         exp++;
 386     }
 387
 388     return exp;
 389 }
 390
 391 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
 392     DEFINE_PROP_DRIVE("drive", _state, _conf.bs),                       \
 393     DEFINE_PROP_UINT16("logical_block_size", _state,                    \
 394                        _conf.logical_block_size, 512),                  \
 395     DEFINE_PROP_UINT16("physical_block_size", _state,                   \
 396                        _conf.physical_block_size, 512),                 \
 397     DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
 398     DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
 399     DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1),        \
 400     DEFINE_PROP_UINT32("discard_granularity", _state, \
 401                        _conf.discard_granularity, 0)
 402
 403 #endif
 404