File:  [Qemu by Fabrice Bellard] / qemu / block.h
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 16:50:51 2018 UTC (3 years, 2 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0100, HEAD
qemu 0.10.0

    1: #ifndef BLOCK_H
    2: #define BLOCK_H
    3: 
    4: #include "qemu-aio.h"
    5: #include "qemu-common.h"
    6: 
    7: /* block.c */
    8: typedef struct BlockDriver BlockDriver;
    9: 
   10: extern BlockDriver bdrv_raw;
   11: extern BlockDriver bdrv_host_device;
   12: extern BlockDriver bdrv_cow;
   13: extern BlockDriver bdrv_qcow;
   14: extern BlockDriver bdrv_vmdk;
   15: extern BlockDriver bdrv_cloop;
   16: extern BlockDriver bdrv_dmg;
   17: extern BlockDriver bdrv_bochs;
   18: extern BlockDriver bdrv_vpc;
   19: extern BlockDriver bdrv_vvfat;
   20: extern BlockDriver bdrv_qcow2;
   21: extern BlockDriver bdrv_parallels;
   22: extern BlockDriver bdrv_nbd;
   23: 
   24: typedef struct BlockDriverInfo {
   25:     /* in bytes, 0 if irrelevant */
   26:     int cluster_size;
   27:     /* offset at which the VM state can be saved (0 if not possible) */
   28:     int64_t vm_state_offset;
   29:     int64_t highest_alloc; /* highest allocated block offset (in bytes) */
   30:     int64_t num_free_bytes; /* below highest_alloc  */
   31: } BlockDriverInfo;
   32: 
   33: typedef struct QEMUSnapshotInfo {
   34:     char id_str[128]; /* unique snapshot id */
   35:     /* the following fields are informative. They are not needed for
   36:        the consistency of the snapshot */
   37:     char name[256]; /* user choosen name */
   38:     uint32_t vm_state_size; /* VM state info size */
   39:     uint32_t date_sec; /* UTC date of the snapshot */
   40:     uint32_t date_nsec;
   41:     uint64_t vm_clock_nsec; /* VM clock relative to boot */
   42: } QEMUSnapshotInfo;
   43: 
   44: #define BDRV_O_RDONLY      0x0000
   45: #define BDRV_O_RDWR        0x0002
   46: #define BDRV_O_ACCESS      0x0003
   47: #define BDRV_O_CREAT       0x0004 /* create an empty file */
   48: #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
   49: #define BDRV_O_FILE        0x0010 /* open as a raw file (do not try to
   50:                                      use a disk image format on top of
   51:                                      it (default for
   52:                                      bdrv_file_open()) */
   53: #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
   54: #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
   55: #define BDRV_O_CACHE_DEF   0x0080 /* use default caching */
   56: 
   57: #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_CACHE_DEF)
   58: 
   59: void bdrv_info(void);
   60: void bdrv_info_stats(void);
   61: 
   62: void bdrv_init(void);
   63: BlockDriver *bdrv_find_format(const char *format_name);
   64: int bdrv_create(BlockDriver *drv,
   65:                 const char *filename, int64_t size_in_sectors,
   66:                 const char *backing_file, int flags);
   67: BlockDriverState *bdrv_new(const char *device_name);
   68: void bdrv_delete(BlockDriverState *bs);
   69: int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
   70: int bdrv_open(BlockDriverState *bs, const char *filename, int flags);
   71: int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
   72:                BlockDriver *drv);
   73: void bdrv_close(BlockDriverState *bs);
   74: int bdrv_read(BlockDriverState *bs, int64_t sector_num,
   75:               uint8_t *buf, int nb_sectors);
   76: int bdrv_write(BlockDriverState *bs, int64_t sector_num,
   77:                const uint8_t *buf, int nb_sectors);
   78: int bdrv_pread(BlockDriverState *bs, int64_t offset,
   79:                void *buf, int count);
   80: int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
   81:                 const void *buf, int count);
   82: int bdrv_truncate(BlockDriverState *bs, int64_t offset);
   83: int64_t bdrv_getlength(BlockDriverState *bs);
   84: void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
   85: void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
   86: int bdrv_commit(BlockDriverState *bs);
   87: /* async block I/O */
   88: typedef struct BlockDriverAIOCB BlockDriverAIOCB;
   89: typedef void BlockDriverCompletionFunc(void *opaque, int ret);
   90: 
   91: BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
   92:                                  QEMUIOVector *iov, int nb_sectors,
   93:                                  BlockDriverCompletionFunc *cb, void *opaque);
   94: BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
   95:                                   QEMUIOVector *iov, int nb_sectors,
   96:                                   BlockDriverCompletionFunc *cb, void *opaque);
   97: 
   98: BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
   99:                                 uint8_t *buf, int nb_sectors,
  100:                                 BlockDriverCompletionFunc *cb, void *opaque);
  101: BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
  102:                                  const uint8_t *buf, int nb_sectors,
  103:                                  BlockDriverCompletionFunc *cb, void *opaque);
  104: void bdrv_aio_cancel(BlockDriverAIOCB *acb);
  105: 
  106: int qemu_key_check(BlockDriverState *bs, const char *name);
  107: 
  108: /* Ensure contents are flushed to disk.  */
  109: void bdrv_flush(BlockDriverState *bs);
  110: void bdrv_flush_all(void);
  111: 
  112: int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
  113: 	int *pnum);
  114: 
  115: #define BDRV_TYPE_HD     0
  116: #define BDRV_TYPE_CDROM  1
  117: #define BDRV_TYPE_FLOPPY 2
  118: #define BIOS_ATA_TRANSLATION_AUTO   0
  119: #define BIOS_ATA_TRANSLATION_NONE   1
  120: #define BIOS_ATA_TRANSLATION_LBA    2
  121: #define BIOS_ATA_TRANSLATION_LARGE  3
  122: #define BIOS_ATA_TRANSLATION_RECHS  4
  123: 
  124: void bdrv_set_geometry_hint(BlockDriverState *bs,
  125:                             int cyls, int heads, int secs);
  126: void bdrv_set_type_hint(BlockDriverState *bs, int type);
  127: void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
  128: void bdrv_get_geometry_hint(BlockDriverState *bs,
  129:                             int *pcyls, int *pheads, int *psecs);
  130: int bdrv_get_type_hint(BlockDriverState *bs);
  131: int bdrv_get_translation_hint(BlockDriverState *bs);
  132: int bdrv_is_removable(BlockDriverState *bs);
  133: int bdrv_is_read_only(BlockDriverState *bs);
  134: int bdrv_is_sg(BlockDriverState *bs);
  135: int bdrv_is_inserted(BlockDriverState *bs);
  136: int bdrv_media_changed(BlockDriverState *bs);
  137: int bdrv_is_locked(BlockDriverState *bs);
  138: void bdrv_set_locked(BlockDriverState *bs, int locked);
  139: void bdrv_eject(BlockDriverState *bs, int eject_flag);
  140: void bdrv_set_change_cb(BlockDriverState *bs,
  141:                         void (*change_cb)(void *opaque), void *opaque);
  142: void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
  143: BlockDriverState *bdrv_find(const char *name);
  144: void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque);
  145: int bdrv_is_encrypted(BlockDriverState *bs);
  146: int bdrv_set_key(BlockDriverState *bs, const char *key);
  147: void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
  148:                          void *opaque);
  149: const char *bdrv_get_device_name(BlockDriverState *bs);
  150: int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
  151:                           const uint8_t *buf, int nb_sectors);
  152: int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
  153: 
  154: void bdrv_get_backing_filename(BlockDriverState *bs,
  155:                                char *filename, int filename_size);
  156: int bdrv_snapshot_create(BlockDriverState *bs,
  157:                          QEMUSnapshotInfo *sn_info);
  158: int bdrv_snapshot_goto(BlockDriverState *bs,
  159:                        const char *snapshot_id);
  160: int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
  161: int bdrv_snapshot_list(BlockDriverState *bs,
  162:                        QEMUSnapshotInfo **psn_info);
  163: char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
  164: int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
  165: 
  166: char *get_human_readable_size(char *buf, int buf_size, int64_t size);
  167: int path_is_absolute(const char *path);
  168: void path_combine(char *dest, int dest_size,
  169:                   const char *base_path,
  170:                   const char *filename);
  171: 
  172: #endif

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