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_NOCACHE     0x0020 /* do not use the host page cache */
  33 #define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
  34 #define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
  35 #define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
  36
  37 #define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB)
  38
  39 #define BDRV_SECTOR_BITS   9
  40 #define BDRV_SECTOR_SIZE   (1 << BDRV_SECTOR_BITS)
  41 #define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1);
  42
  43 typedef enum {
  44     BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
  45 } BlockMonEventAction;
  46
  47 void bdrv_mon_event(const BlockDriverState *bdrv,
  48                     BlockMonEventAction action, int is_read);
  49 void bdrv_info_print(Monitor *mon, const QObject *data);
  50 void bdrv_info(Monitor *mon, QObject **ret_data);
  51 void bdrv_stats_print(Monitor *mon, const QObject *data);
  52 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
  53
  54 void bdrv_init(void);
  55 void bdrv_init_with_whitelist(void);
  56 BlockDriver *bdrv_find_format(const char *format_name);
  57 BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
  58 int bdrv_create(BlockDriver *drv, const char* filename,
  59     QEMUOptionParameter *options);
  60 BlockDriverState *bdrv_new(const char *device_name);
  61 void bdrv_delete(BlockDriverState *bs);
  62 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
  63 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
  64               BlockDriver *drv);
  65 void bdrv_close(BlockDriverState *bs);
  66 int bdrv_check(BlockDriverState *bs);
  67 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
  68               uint8_t *buf, int nb_sectors);
  69 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
  70                const uint8_t *buf, int nb_sectors);
  71 int bdrv_pread(BlockDriverState *bs, int64_t offset,
  72                void *buf, int count);
  73 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
  74                 const void *buf, int count);
  75 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
  76 int64_t bdrv_getlength(BlockDriverState *bs);
  77 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
  78 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
  79 int bdrv_commit(BlockDriverState *bs);
  80 int bdrv_change_backing_file(BlockDriverState *bs,
  81     const char *backing_file, const char *backing_fmt);
  82 void bdrv_register(BlockDriver *bdrv);
  83
  84 /* async block I/O */
  85 typedef struct BlockDriverAIOCB BlockDriverAIOCB;
  86 typedef void BlockDriverCompletionFunc(void *opaque, int ret);
  87 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
  88                                      int sector_num);
  89 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
  90                                  QEMUIOVector *iov, int nb_sectors,
  91                                  BlockDriverCompletionFunc *cb, void *opaque);
  92 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
  93                                   QEMUIOVector *iov, int nb_sectors,
  94                                   BlockDriverCompletionFunc *cb, void *opaque);
  95 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
  96                                  BlockDriverCompletionFunc *cb, void *opaque);
  97 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
  98
  99 typedef struct BlockRequest {
 100     /* Fields to be filled by multiwrite caller */
 101     int64_t sector;
 102     int nb_sectors;
 103     QEMUIOVector *qiov;
 104     BlockDriverCompletionFunc *cb;
 105     void *opaque;
 106
 107     /* Filled by multiwrite implementation */
 108     int error;
 109 } BlockRequest;
 110
 111 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
 112     int num_reqs);
 113
 114 /* sg packet commands */
 115 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 116 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 117         unsigned long int req, void *buf,
 118         BlockDriverCompletionFunc *cb, void *opaque);
 119
 120 /* Ensure contents are flushed to disk.  */
 121 void bdrv_flush(BlockDriverState *bs);
 122 void bdrv_flush_all(void);
 123
 124 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
 125         int *pnum);
 126
 127 #define BDRV_TYPE_HD     0
 128 #define BDRV_TYPE_CDROM  1
 129 #define BDRV_TYPE_FLOPPY 2
 130 #define BIOS_ATA_TRANSLATION_AUTO   0
 131 #define BIOS_ATA_TRANSLATION_NONE   1
 132 #define BIOS_ATA_TRANSLATION_LBA    2
 133 #define BIOS_ATA_TRANSLATION_LARGE  3
 134 #define BIOS_ATA_TRANSLATION_RECHS  4
 135
 136 void bdrv_set_geometry_hint(BlockDriverState *bs,
 137                             int cyls, int heads, int secs);
 138 void bdrv_set_type_hint(BlockDriverState *bs, int type);
 139 void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
 140 void bdrv_get_geometry_hint(BlockDriverState *bs,
 141                             int *pcyls, int *pheads, int *psecs);
 142 int bdrv_get_type_hint(BlockDriverState *bs);
 143 int bdrv_get_translation_hint(BlockDriverState *bs);
 144 int bdrv_is_removable(BlockDriverState *bs);
 145 int bdrv_is_read_only(BlockDriverState *bs);
 146 int bdrv_is_sg(BlockDriverState *bs);
 147 int bdrv_enable_write_cache(BlockDriverState *bs);
 148 int bdrv_is_inserted(BlockDriverState *bs);
 149 int bdrv_media_changed(BlockDriverState *bs);
 150 int bdrv_is_locked(BlockDriverState *bs);
 151 void bdrv_set_locked(BlockDriverState *bs, int locked);
 152 int bdrv_eject(BlockDriverState *bs, int eject_flag);
 153 void bdrv_set_change_cb(BlockDriverState *bs,
 154                         void (*change_cb)(void *opaque), void *opaque);
 155 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
 156 BlockDriverState *bdrv_find(const char *name);
 157 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
 158                   void *opaque);
 159 int bdrv_is_encrypted(BlockDriverState *bs);
 160 int bdrv_key_required(BlockDriverState *bs);
 161 int bdrv_set_key(BlockDriverState *bs, const char *key);
 162 int bdrv_query_missing_keys(void);
 163 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 164                          void *opaque);
 165 const char *bdrv_get_device_name(BlockDriverState *bs);
 166 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 167                           const uint8_t *buf, int nb_sectors);
 168 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 169
 170 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 171 void bdrv_get_backing_filename(BlockDriverState *bs,
 172                                char *filename, int filename_size);
 173 int bdrv_snapshot_create(BlockDriverState *bs,
 174                          QEMUSnapshotInfo *sn_info);
 175 int bdrv_snapshot_goto(BlockDriverState *bs,
 176                        const char *snapshot_id);
 177 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
 178 int bdrv_snapshot_list(BlockDriverState *bs,
 179                        QEMUSnapshotInfo **psn_info);
 180 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
 181
 182 char *get_human_readable_size(char *buf, int buf_size, int64_t size);
 183 int path_is_absolute(const char *path);
 184 void path_combine(char *dest, int dest_size,
 185                   const char *base_path,
 186                   const char *filename);
 187
 188 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
 189                       int64_t pos, int size);
 190
 191 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 192                       int64_t pos, int size);
 193
 194 #define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
 195
 196 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
 197 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
 198 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
 199                       int nr_sectors);
 200 int64_t bdrv_get_dirty_count(BlockDriverState *bs);
 201
 202
 203 typedef enum {
 204     BLKDBG_L1_UPDATE,
 205
 206     BLKDBG_L1_GROW_ALLOC_TABLE,
 207     BLKDBG_L1_GROW_WRITE_TABLE,
 208     BLKDBG_L1_GROW_ACTIVATE_TABLE,
 209
 210     BLKDBG_L2_LOAD,
 211     BLKDBG_L2_UPDATE,
 212     BLKDBG_L2_UPDATE_COMPRESSED,
 213     BLKDBG_L2_ALLOC_COW_READ,
 214     BLKDBG_L2_ALLOC_WRITE,
 215
 216     BLKDBG_READ,
 217     BLKDBG_READ_AIO,
 218     BLKDBG_READ_BACKING,
 219     BLKDBG_READ_BACKING_AIO,
 220     BLKDBG_READ_COMPRESSED,
 221
 222     BLKDBG_WRITE_AIO,
 223     BLKDBG_WRITE_COMPRESSED,
 224
 225     BLKDBG_VMSTATE_LOAD,
 226     BLKDBG_VMSTATE_SAVE,
 227
 228     BLKDBG_COW_READ,
 229     BLKDBG_COW_WRITE,
 230
 231     BLKDBG_REFTABLE_LOAD,
 232     BLKDBG_REFTABLE_GROW,
 233
 234     BLKDBG_REFBLOCK_LOAD,
 235     BLKDBG_REFBLOCK_UPDATE,
 236     BLKDBG_REFBLOCK_UPDATE_PART,
 237     BLKDBG_REFBLOCK_ALLOC,
 238     BLKDBG_REFBLOCK_ALLOC_HOOKUP,
 239     BLKDBG_REFBLOCK_ALLOC_WRITE,
 240     BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
 241     BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
 242     BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
 243
 244     BLKDBG_CLUSTER_ALLOC,
 245     BLKDBG_CLUSTER_ALLOC_BYTES,
 246     BLKDBG_CLUSTER_FREE,
 247
 248     BLKDBG_EVENT_MAX,
 249 } BlkDebugEvent;
 250
 251 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
 252 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
 253
 254 #endif