Archipelago » qemu

/*

 * 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"

#include "qemu-coroutine.h"

#include "qemu-timer.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"

#define BLOCK_OPT_SUBFMT        "subformat"

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 coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs,

        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);

    int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,

        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);

    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);

    int64_t (*bdrv_get_allocated_file_size)(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);

    void (*bdrv_eject)(BlockDriverState *bs, int eject_flag);

    void (*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 nr_bytes[BDRV_MAX_IOTYPE];

    uint64_t nr_ops[BDRV_MAX_IOTYPE];

    uint64_t total_time_ns[BDRV_MAX_IOTYPE];

    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;

    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 */