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 "qobject.h"
   8
   9 /* block.c */
  10 typedef struct BlockDriver BlockDriver;
  11
  12 typedef struct BlockDriverInfo {
  13     /* in bytes, 0 if irrelevant */
  14     int cluster_size;
  15     /* offset at which the VM state can be saved (0 if not possible) */
  16     int64_t vm_state_offset;
  17 } BlockDriverInfo;
  18
  19 typedef struct QEMUSnapshotInfo {
  20     char id_str[128]; /* unique snapshot id */
  21     /* the following fields are informative. They are not needed for
  22        the consistency of the snapshot */
  23     char name[256]; /* user choosen name */
  24     uint32_t vm_state_size; /* VM state info size */
  25     uint32_t date_sec; /* UTC date of the snapshot */
  26     uint32_t date_nsec;
  27     uint64_t vm_clock_nsec; /* VM clock relative to boot */
  28 } QEMUSnapshotInfo;
  29
  30 #define BDRV_O_RDWR        0x0002
  31 #define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
  32 #define BDRV_O_FILE        0x0010 /* open as a raw file (do not try to
  33                                      use a disk image format on top of
  34                                      it (default for
  35                                      bdrv_file_open()) */
  36 #define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
  37 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  38 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  39 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  40
  41 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB)
  42
  43 #define BDRV_SECTOR_BITS   9
  44 #define BDRV_SECTOR_SIZE   (1 << BDRV_SECTOR_BITS)
  45 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1);
  46
  47 typedef enum {
  48     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
  49 } BlockMonEventAction;
  50
  51 void bdrv_mon_event(const BlockDriverState *bdrv,
  52                     BlockMonEventAction action, int is_read);
  53 void bdrv_info_print(Monitor *mon, const QObject *data);
  54 void bdrv_info(Monitor *mon, QObject **ret_data);
  55 void bdrv_stats_print(Monitor *mon, const QObject *data);
  56 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
  57
  58 void bdrv_init(void);
  59 void bdrv_init_with_whitelist(void);
  60 BlockDriver *bdrv_find_format(const char *format_name);
  61 BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
  62 int bdrv_create(BlockDriver *drv, const char* filename,
  63     QEMUOptionParameter *options);
  64 int bdrv_create2(BlockDriver *drv,
  65                  const char *filename, int64_t size_in_sectors,
  66                  const char *backing_file, const char *backing_format,
  67                  int flags);
  68 BlockDriverState *bdrv_new(const char *device_name);
  69 void bdrv_delete(BlockDriverState *bs);
  70 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
  71 int bdrv_open(BlockDriverState *bs, const char *filename, int flags);
  72 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
  73                BlockDriver *drv);
  74 void bdrv_close(BlockDriverState *bs);
  75 int bdrv_check(BlockDriverState *bs);
  76 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
  77               uint8_t *buf, int nb_sectors);
  78 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
  79                const uint8_t *buf, int nb_sectors);
  80 int bdrv_pread(BlockDriverState *bs, int64_t offset,
  81                void *buf, int count);
  82 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
  83                 const void *buf, int count);
  84 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
  85 int64_t bdrv_getlength(BlockDriverState *bs);
  86 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
  87 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
  88 int bdrv_commit(BlockDriverState *bs);
  89 int bdrv_change_backing_file(BlockDriverState *bs,
  90     const char *backing_file, const char *backing_fmt);
  91 void bdrv_register(BlockDriver *bdrv);
  92
  93 /* async block I/O */
  94 typedef struct BlockDriverAIOCB BlockDriverAIOCB;
  95 typedef void BlockDriverCompletionFunc(void *opaque, int ret);
  96 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
  97                                      int sector_num);
  98 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
  99                                  QEMUIOVector *iov, int nb_sectors,
 100                                  BlockDriverCompletionFunc *cb, void *opaque);
 101 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
 102                                   QEMUIOVector *iov, int nb_sectors,
 103                                   BlockDriverCompletionFunc *cb, void *opaque);
 104 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
 105                                  BlockDriverCompletionFunc *cb, void *opaque);
 106 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
 107
 108 typedef struct BlockRequest {
 109     /* Fields to be filled by multiwrite caller */
 110     int64_t sector;
 111     int nb_sectors;
 112     QEMUIOVector *qiov;
 113     BlockDriverCompletionFunc *cb;
 114     void *opaque;
 115
 116     /* Filled by multiwrite implementation */
 117     int error;
 118 } BlockRequest;
 119
 120 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 121     int num_reqs);
 122
 123 /* sg packet commands */
 124 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 125 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 126         unsigned long int req, void *buf,
 127         BlockDriverCompletionFunc *cb, void *opaque);
 128
 129 /* Ensure contents are flushed to disk.  */
 130 void bdrv_flush(BlockDriverState *bs);
 131 void bdrv_flush_all(void);
 132
 133 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 134         int *pnum);
 135
 136 #define BDRV_TYPE_HD     0
 137 #define BDRV_TYPE_CDROM  1
 138 #define BDRV_TYPE_FLOPPY 2
 139 #define BIOS_ATA_TRANSLATION_AUTO   0
 140 #define BIOS_ATA_TRANSLATION_NONE   1
 141 #define BIOS_ATA_TRANSLATION_LBA    2
 142 #define BIOS_ATA_TRANSLATION_LARGE  3
 143 #define BIOS_ATA_TRANSLATION_RECHS  4
 144
 145 void bdrv_set_geometry_hint(BlockDriverState *bs,
 146                             int cyls, int heads, int secs);
 147 void bdrv_set_type_hint(BlockDriverState *bs, int type);
 148 void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
 149 void bdrv_get_geometry_hint(BlockDriverState *bs,
 150                             int *pcyls, int *pheads, int *psecs);
 151 int bdrv_get_type_hint(BlockDriverState *bs);
 152 int bdrv_get_translation_hint(BlockDriverState *bs);
 153 int bdrv_is_removable(BlockDriverState *bs);
 154 int bdrv_is_read_only(BlockDriverState *bs);
 155 int bdrv_is_sg(BlockDriverState *bs);
 156 int bdrv_enable_write_cache(BlockDriverState *bs);
 157 int bdrv_is_inserted(BlockDriverState *bs);
 158 int bdrv_media_changed(BlockDriverState *bs);
 159 int bdrv_is_locked(BlockDriverState *bs);
 160 void bdrv_set_locked(BlockDriverState *bs, int locked);
 161 int bdrv_eject(BlockDriverState *bs, int eject_flag);
 162 void bdrv_set_change_cb(BlockDriverState *bs,
 163                         void (*change_cb)(void *opaque), void *opaque);
 164 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
 165 BlockDriverState *bdrv_find(const char *name);
 166 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 167                   void *opaque);
 168 int bdrv_is_encrypted(BlockDriverState *bs);
 169 int bdrv_key_required(BlockDriverState *bs);
 170 int bdrv_set_key(BlockDriverState *bs, const char *key);
 171 int bdrv_query_missing_keys(void);
 172 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 173                          void *opaque);
 174 const char *bdrv_get_device_name(BlockDriverState *bs);
 175 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 176                           const uint8_t *buf, int nb_sectors);
 177 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 178
 179 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 180 void bdrv_get_backing_filename(BlockDriverState *bs,
 181                                char *filename, int filename_size);
 182 int bdrv_snapshot_create(BlockDriverState *bs,
 183                          QEMUSnapshotInfo *sn_info);
 184 int bdrv_snapshot_goto(BlockDriverState *bs,
 185                        const char *snapshot_id);
 186 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
 187 int bdrv_snapshot_list(BlockDriverState *bs,
 188                        QEMUSnapshotInfo **psn_info);
 189 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
 190
 191 char *get_human_readable_size(char *buf, int buf_size, int64_t size);
 192 int path_is_absolute(const char *path);
 193 void path_combine(char *dest, int dest_size,
 194                   const char *base_path,
 195                   const char *filename);
 196
 197 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 198                       int64_t pos, int size);
 199
 200 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 201                       int64_t pos, int size);
 202
 203 #define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
 204
 205 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
 206 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 207 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
 208                       int nr_sectors);
 209 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 210 #endif