block.h

   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