Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 266 lines (222 sloc) 10.081 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265
/*
* QEMU System Emulator block driver
*
* Copyright (c) 2003 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef BLOCK_INT_H
#define BLOCK_INT_H

#include "block.h"
#include "qemu-option.h"
#include "qemu-queue.h"

#define BLOCK_FLAG_ENCRYPT 1
#define BLOCK_FLAG_COMPAT6 4

#define BLOCK_OPT_SIZE "size"
#define BLOCK_OPT_ENCRYPT "encryption"
#define BLOCK_OPT_COMPAT6 "compat6"
#define BLOCK_OPT_BACKING_FILE "backing_file"
#define BLOCK_OPT_BACKING_FMT "backing_fmt"
#define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
#define BLOCK_OPT_TABLE_SIZE "table_size"
#define BLOCK_OPT_PREALLOC "preallocation"

typedef struct AIOPool {
    void (*cancel)(BlockDriverAIOCB *acb);
    int aiocb_size;
    BlockDriverAIOCB *free_aiocb;
} AIOPool;

struct BlockDriver {
    const char *format_name;
    int instance_size;
    int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
    int (*bdrv_probe_device)(const char *filename);
    int (*bdrv_open)(BlockDriverState *bs, int flags);
    int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags);
    int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
                     uint8_t *buf, int nb_sectors);
    int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
                      const uint8_t *buf, int nb_sectors);
    void (*bdrv_close)(BlockDriverState *bs);
    int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
    int (*bdrv_flush)(BlockDriverState *bs);
    int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
                             int nb_sectors, int *pnum);
    int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
    int (*bdrv_make_empty)(BlockDriverState *bs);
    /* aio */
    BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque);
    int (*bdrv_discard)(BlockDriverState *bs, int64_t sector_num,
                        int nb_sectors);

    int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
        int num_reqs);
    int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,
        BlockRequest *b);


    const char *protocol_name;
    int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
    int64_t (*bdrv_getlength)(BlockDriverState *bs);
    int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
                                 const uint8_t *buf, int nb_sectors);

    int (*bdrv_snapshot_create)(BlockDriverState *bs,
                                QEMUSnapshotInfo *sn_info);
    int (*bdrv_snapshot_goto)(BlockDriverState *bs,
                              const char *snapshot_id);
    int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
    int (*bdrv_snapshot_list)(BlockDriverState *bs,
                              QEMUSnapshotInfo **psn_info);
    int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
                                  const char *snapshot_name);
    int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);

    int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf,
                             int64_t pos, int size);
    int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
                             int64_t pos, int size);

    int (*bdrv_change_backing_file)(BlockDriverState *bs,
        const char *backing_file, const char *backing_fmt);

    /* removable device specific */
    int (*bdrv_is_inserted)(BlockDriverState *bs);
    int (*bdrv_media_changed)(BlockDriverState *bs);
    int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
    int (*bdrv_set_locked)(BlockDriverState *bs, int locked);

    /* to control generic scsi devices */
    int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
    BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
        unsigned long int req, void *buf,
        BlockDriverCompletionFunc *cb, void *opaque);

    /* List of options for creating images, terminated by name == NULL */
    QEMUOptionParameter *create_options;


    /*
* Returns 0 for completed check, -errno for internal errors.
* The check results are stored in result.
*/
    int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result);

    void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);

    /*
* Returns 1 if newly created images are guaranteed to contain only
* zeros, 0 otherwise.
*/
    int (*bdrv_has_zero_init)(BlockDriverState *bs);

    QLIST_ENTRY(BlockDriver) list;
};

struct BlockDriverState {
    int64_t total_sectors; /* if we are reading a disk image, give its
size in sectors */
    int read_only; /* if true, the media is read only */
    int keep_read_only; /* if true, the media was requested to stay read only */
    int open_flags; /* flags used to open the file, re-used for re-open */
    int removable; /* if true, the media can be removed */
    int locked; /* if true, the media cannot temporarily be ejected */
    int tray_open; /* if true, the virtual tray is open */
    int encrypted; /* if true, the media is encrypted */
    int valid_key; /* if true, a valid encryption key has been set */
    int sg; /* if true, the device is a /dev/sg* */
    /* event callback when inserting/removing */
    void (*change_cb)(void *opaque, int reason);
    void *change_opaque;

    BlockDriver *drv; /* NULL means no media */
    void *opaque;

    DeviceState *peer;

    char filename[1024];
    char backing_file[1024]; /* if non zero, the image is a diff of
this file image */
    char backing_format[16]; /* if non-zero and backing_file exists */
    int is_temporary;
    int media_changed;

    BlockDriverState *backing_hd;
    BlockDriverState *file;

    /* async read/write emulation */

    void *sync_aiocb;

    /* I/O stats (display with "info blockstats"). */
    uint64_t rd_bytes;
    uint64_t wr_bytes;
    uint64_t rd_ops;
    uint64_t wr_ops;
    uint64_t wr_highest_sector;

    /* Whether the disk can expand beyond total_sectors */
    int growable;

    /* the memory alignment required for the buffers handled by this driver */
    int buffer_alignment;

    /* do we need to tell the quest if we have a volatile write cache? */
    int enable_write_cache;

    /* NOTE: the following infos are only hints for real hardware
drivers. They are not used by the block driver */
    int cyls, heads, secs, translation;
    int type;
    BlockErrorAction on_read_error, on_write_error;
    char device_name[32];
    unsigned long *dirty_bitmap;
    int64_t dirty_count;
    int in_use; /* users other than guest access, eg. block migration */
    QTAILQ_ENTRY(BlockDriverState) list;
    void *private;
};

#define CHANGE_MEDIA 0x01
#define CHANGE_SIZE 0x02

struct BlockDriverAIOCB {
    AIOPool *pool;
    BlockDriverState *bs;
    BlockDriverCompletionFunc *cb;
    void *opaque;
    BlockDriverAIOCB *next;
};

void get_tmp_filename(char *filename, int size);

void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
                   BlockDriverCompletionFunc *cb, void *opaque);
void qemu_aio_release(void *p);

void *qemu_blockalign(BlockDriverState *bs, size_t size);

#ifdef _WIN32
int is_windows_drive(const char *filename);
#endif

typedef struct BlockConf {
    BlockDriverState *bs;
    uint16_t physical_block_size;
    uint16_t logical_block_size;
    uint16_t min_io_size;
    uint32_t opt_io_size;
    int32_t bootindex;
    uint32_t discard_granularity;
} BlockConf;

static inline unsigned int get_physical_block_exp(BlockConf *conf)
{
    unsigned int exp = 0, size;

    for (size = conf->physical_block_size;
        size > conf->logical_block_size;
        size >>= 1) {
        exp++;
    }

    return exp;
}

#define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \
DEFINE_PROP_UINT16("logical_block_size", _state, \
_conf.logical_block_size, 512), \
DEFINE_PROP_UINT16("physical_block_size", _state, \
_conf.physical_block_size, 512), \
DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \
DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \
DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1), \
DEFINE_PROP_UINT32("discard_granularity", _state, \
_conf.discard_granularity, 0)

#endif /* BLOCK_INT_H */
Something went wrong with that request. Please try again.