[qemu.git] / block.h

#ifndef BLOCK_H
#define BLOCK_H

#include "qemu-aio.h"
#include "qemu-common.h"
#include "qemu-option.h"
#include "qemu-coroutine.h"
#include "qobject.h"

/* block.c */
typedef struct BlockDriver BlockDriver;

typedef struct BlockDriverInfo {
    /* in bytes, 0 if irrelevant */
    int cluster_size;
    /* offset at which the VM state can be saved (0 if not possible) */
    int64_t vm_state_offset;
    bool is_dirty;
} BlockDriverInfo;

typedef struct BlockFragInfo {
    uint64_t allocated_clusters;
    uint64_t total_clusters;
    uint64_t fragmented_clusters;
} BlockFragInfo;

typedef struct QEMUSnapshotInfo {
    char id_str[128]; /* unique snapshot id */
    /* the following fields are informative. They are not needed for
       the consistency of the snapshot */
    char name[256]; /* user chosen name */
    uint64_t vm_state_size; /* VM state info size */
    uint32_t date_sec; /* UTC date of the snapshot */
    uint32_t date_nsec;
    uint64_t vm_clock_nsec; /* VM clock relative to boot */
} QEMUSnapshotInfo;

/* Callbacks for block device models */
typedef struct BlockDevOps {
    /*
     * Runs when virtual media changed (monitor commands eject, change)
     * Argument load is true on load and false on eject.
     * Beware: doesn't run when a host device's physical media
     * changes.  Sure would be useful if it did.
     * Device models with removable media must implement this callback.
     */
    void (*change_media_cb)(void *opaque, bool load);
    /*
     * Runs when an eject request is issued from the monitor, the tray
     * is closed, and the medium is locked.
     * Device models that do not implement is_medium_locked will not need
     * this callback.  Device models that can lock the medium or tray might
     * want to implement the callback and unlock the tray when "force" is
     * true, even if they do not support eject requests.
     */
    void (*eject_request_cb)(void *opaque, bool force);
    /*
     * Is the virtual tray open?
     * Device models implement this only when the device has a tray.
     */
    bool (*is_tray_open)(void *opaque);
    /*
     * Is the virtual medium locked into the device?
     * Device models implement this only when device has such a lock.
     */
    bool (*is_medium_locked)(void *opaque);
    /*
     * Runs when the size changed (e.g. monitor command block_resize)
     */
    void (*resize_cb)(void *opaque);
} BlockDevOps;

#define BDRV_O_RDWR        0x0002
#define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */
#define BDRV_O_NOCACHE     0x0020 /* do not use the host page cache */
#define BDRV_O_CACHE_WB    0x0040 /* use write-back caching */
#define BDRV_O_NATIVE_AIO  0x0080 /* use native AIO instead of the thread pool */
#define BDRV_O_NO_BACKING  0x0100 /* don't open the backing file */
#define BDRV_O_NO_FLUSH    0x0200 /* disable flushing on this disk */
#define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
#define BDRV_O_INCOMING    0x0800  /* consistency hint for incoming migration */

#define BDRV_O_CACHE_MASK  (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)

#define BDRV_SECTOR_BITS   9
#define BDRV_SECTOR_SIZE   (1ULL << BDRV_SECTOR_BITS)
#define BDRV_SECTOR_MASK   ~(BDRV_SECTOR_SIZE - 1)

typedef enum {
    BLOCK_ERR_REPORT, BLOCK_ERR_IGNORE, BLOCK_ERR_STOP_ENOSPC,
    BLOCK_ERR_STOP_ANY
} BlockErrorAction;

typedef enum {
    BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
} BlockQMPEventAction;

void bdrv_iostatus_enable(BlockDriverState *bs);
void bdrv_iostatus_reset(BlockDriverState *bs);
void bdrv_iostatus_disable(BlockDriverState *bs);
bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
                               BlockQMPEventAction action, int is_read);
void bdrv_info_print(Monitor *mon, const QObject *data);
void bdrv_info(Monitor *mon, QObject **ret_data);
void bdrv_stats_print(Monitor *mon, const QObject *data);
void bdrv_info_stats(Monitor *mon, QObject **ret_data);

/* disk I/O throttling */
void bdrv_io_limits_enable(BlockDriverState *bs);
void bdrv_io_limits_disable(BlockDriverState *bs);
bool bdrv_io_limits_enabled(BlockDriverState *bs);

void bdrv_init(void);
void bdrv_init_with_whitelist(void);
BlockDriver *bdrv_find_protocol(const char *filename);
BlockDriver *bdrv_find_format(const char *format_name);
BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
int bdrv_create(BlockDriver *drv, const char* filename,
    QEMUOptionParameter *options);
int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
BlockDriverState *bdrv_new(const char *device_name);
void bdrv_make_anon(BlockDriverState *bs);
void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
void bdrv_delete(BlockDriverState *bs);
int bdrv_parse_cache_flags(const char *mode, int *flags);
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
              BlockDriver *drv);
void bdrv_close(BlockDriverState *bs);
int bdrv_attach_dev(BlockDriverState *bs, void *dev);
void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
void bdrv_detach_dev(BlockDriverState *bs, void *dev);
void *bdrv_get_attached_dev(BlockDriverState *bs);
void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
                      void *opaque);
void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
bool bdrv_dev_has_removable_media(BlockDriverState *bs);
bool bdrv_dev_is_tray_open(BlockDriverState *bs);
bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
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);
int bdrv_pread(BlockDriverState *bs, int64_t offset,
               void *buf, int count);
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                const void *buf, int count);
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
    const void *buf, int count);
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
    int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_copy_on_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);
/*
 * Efficiently zero a region of the disk image.  Note that this is a regular
 * I/O request like read or write and should have a reasonable size.  This
 * function is not suitable for zeroing the entire image in a single request
 * because it may allocate memory for the entire region.
 */
int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
    int nb_sectors);
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
    int nb_sectors, int *pnum);
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
    const char *backing_file);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
int64_t bdrv_getlength(BlockDriverState *bs);
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs);
int bdrv_commit(BlockDriverState *bs);
int bdrv_commit_all(void);
int bdrv_change_backing_file(BlockDriverState *bs,
    const char *backing_file, const char *backing_fmt);
void bdrv_register(BlockDriver *bdrv);


typedef struct BdrvCheckResult {
    int corruptions;
    int leaks;
    int check_errors;
    BlockFragInfo bfi;
} BdrvCheckResult;

int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res);

/* async block I/O */
typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
                                     int sector_num);
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
                                 QEMUIOVector *iov, int nb_sectors,
                                 BlockDriverCompletionFunc *cb, void *opaque);
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
                                  QEMUIOVector *iov, int nb_sectors,
                                  BlockDriverCompletionFunc *cb, void *opaque);
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
                                 BlockDriverCompletionFunc *cb, void *opaque);
BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
                                   int64_t sector_num, int nb_sectors,
                                   BlockDriverCompletionFunc *cb, void *opaque);
void bdrv_aio_cancel(BlockDriverAIOCB *acb);

typedef struct BlockRequest {
    /* Fields to be filled by multiwrite caller */
    int64_t sector;
    int nb_sectors;
    QEMUIOVector *qiov;
    BlockDriverCompletionFunc *cb;
    void *opaque;

    /* Filled by multiwrite implementation */
    int error;
} BlockRequest;

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

/* sg packet commands */
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);

/* Invalidate any cached metadata used by image formats */
void bdrv_invalidate_cache(BlockDriverState *bs);
void bdrv_invalidate_cache_all(void);

void bdrv_clear_incoming_migration_all(void);

/* Ensure contents are flushed to disk.  */
int bdrv_flush(BlockDriverState *bs);
int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
void bdrv_flush_all(void);
void bdrv_close_all(void);
void bdrv_drain_all(void);

int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
int bdrv_has_zero_init(BlockDriverState *bs);
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
                      int *pnum);

#define BIOS_ATA_TRANSLATION_AUTO   0
#define BIOS_ATA_TRANSLATION_NONE   1
#define BIOS_ATA_TRANSLATION_LBA    2
#define BIOS_ATA_TRANSLATION_LARGE  3
#define BIOS_ATA_TRANSLATION_RECHS  4

void bdrv_set_geometry_hint(BlockDriverState *bs,
                            int cyls, int heads, int secs);
void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
void bdrv_get_geometry_hint(BlockDriverState *bs,
                            int *pcyls, int *pheads, int *psecs);
typedef enum FDriveType {
    FDRIVE_DRV_144  = 0x00,   /* 1.44 MB 3"5 drive      */
    FDRIVE_DRV_288  = 0x01,   /* 2.88 MB 3"5 drive      */
    FDRIVE_DRV_120  = 0x02,   /* 1.2  MB 5"25 drive     */
    FDRIVE_DRV_NONE = 0x03,   /* No drive connected     */
} FDriveType;

typedef enum FDriveRate {
    FDRIVE_RATE_500K = 0x00,  /* 500 Kbps */
    FDRIVE_RATE_300K = 0x01,  /* 300 Kbps */
    FDRIVE_RATE_250K = 0x02,  /* 250 Kbps */
    FDRIVE_RATE_1M   = 0x03,  /*   1 Mbps */
} FDriveRate;

void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
                                   int *max_track, int *last_sect,
                                   FDriveType drive_in, FDriveType *drive,
                                   FDriveRate *rate);
int bdrv_get_translation_hint(BlockDriverState *bs);
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
                       BlockErrorAction on_write_error);
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
int bdrv_is_read_only(BlockDriverState *bs);
int bdrv_is_sg(BlockDriverState *bs);
int bdrv_enable_write_cache(BlockDriverState *bs);
int bdrv_is_inserted(BlockDriverState *bs);
int bdrv_media_changed(BlockDriverState *bs);
void bdrv_lock_medium(BlockDriverState *bs, bool locked);
void bdrv_eject(BlockDriverState *bs, bool eject_flag);
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);
BlockDriverState *bdrv_find(const char *name);
BlockDriverState *bdrv_next(BlockDriverState *bs);
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
                  void *opaque);
int bdrv_is_encrypted(BlockDriverState *bs);
int bdrv_key_required(BlockDriverState *bs);
int bdrv_set_key(BlockDriverState *bs, const char *key);
int bdrv_query_missing_keys(void);
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
                         void *opaque);
const char *bdrv_get_device_name(BlockDriverState *bs);
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
                          const uint8_t *buf, int nb_sectors);
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);

const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
void bdrv_get_backing_filename(BlockDriverState *bs,
                               char *filename, int filename_size);
int bdrv_can_snapshot(BlockDriverState *bs);
int bdrv_is_snapshot(BlockDriverState *bs);
BlockDriverState *bdrv_snapshots(void);
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);
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);

char *get_human_readable_size(char *buf, int buf_size, int64_t size);
int path_is_absolute(const char *path);
void path_combine(char *dest, int dest_size,
                  const char *base_path,
                  const char *filename);

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_img_create(const char *filename, const char *fmt,
                    const char *base_filename, const char *base_fmt,
                    char *options, uint64_t img_size, int flags);

void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
void *qemu_blockalign(BlockDriverState *bs, size_t size);

#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048

void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
                      int nr_sectors);
int64_t bdrv_get_dirty_count(BlockDriverState *bs);

void bdrv_enable_copy_on_read(BlockDriverState *bs);
void bdrv_disable_copy_on_read(BlockDriverState *bs);

void bdrv_set_in_use(BlockDriverState *bs, int in_use);
int bdrv_in_use(BlockDriverState *bs);

enum BlockAcctType {
    BDRV_ACCT_READ,
    BDRV_ACCT_WRITE,
    BDRV_ACCT_FLUSH,
    BDRV_MAX_IOTYPE,
};

typedef struct BlockAcctCookie {
    int64_t bytes;
    int64_t start_time_ns;
    enum BlockAcctType type;
} BlockAcctCookie;

void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
        int64_t bytes, enum BlockAcctType type);
void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);

typedef enum {
    BLKDBG_L1_UPDATE,

    BLKDBG_L1_GROW_ALLOC_TABLE,
    BLKDBG_L1_GROW_WRITE_TABLE,
    BLKDBG_L1_GROW_ACTIVATE_TABLE,

    BLKDBG_L2_LOAD,
    BLKDBG_L2_UPDATE,
    BLKDBG_L2_UPDATE_COMPRESSED,
    BLKDBG_L2_ALLOC_COW_READ,
    BLKDBG_L2_ALLOC_WRITE,

    BLKDBG_READ,
    BLKDBG_READ_AIO,
    BLKDBG_READ_BACKING,
    BLKDBG_READ_BACKING_AIO,
    BLKDBG_READ_COMPRESSED,

    BLKDBG_WRITE_AIO,
    BLKDBG_WRITE_COMPRESSED,

    BLKDBG_VMSTATE_LOAD,
    BLKDBG_VMSTATE_SAVE,

    BLKDBG_COW_READ,
    BLKDBG_COW_WRITE,

    BLKDBG_REFTABLE_LOAD,
    BLKDBG_REFTABLE_GROW,

    BLKDBG_REFBLOCK_LOAD,
    BLKDBG_REFBLOCK_UPDATE,
    BLKDBG_REFBLOCK_UPDATE_PART,
    BLKDBG_REFBLOCK_ALLOC,
    BLKDBG_REFBLOCK_ALLOC_HOOKUP,
    BLKDBG_REFBLOCK_ALLOC_WRITE,
    BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
    BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
    BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,

    BLKDBG_CLUSTER_ALLOC,
    BLKDBG_CLUSTER_ALLOC_BYTES,
    BLKDBG_CLUSTER_FREE,

    BLKDBG_EVENT_MAX,
} BlkDebugEvent;

#define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);


/* Convenience for block device models */

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_BLOCKSIZE("logical_block_size", _state,                 \
                          _conf.logical_block_size, 512),               \
    DEFINE_PROP_BLOCKSIZE("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
Commit	Line	Data
	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 "qemu-coroutine.h"
	8	#include "qobject.h"
	9
	10	/* block.c */
	11	typedef struct BlockDriver BlockDriver;
	12
	13	typedef struct BlockDriverInfo {
	14	/* in bytes, 0 if irrelevant */
	15	int cluster_size;
	16	/* offset at which the VM state can be saved (0 if not possible) */
	17	int64_t vm_state_offset;
	18	bool is_dirty;
	19	} BlockDriverInfo;
	20
	21	typedef struct BlockFragInfo {
	22	uint64_t allocated_clusters;
	23	uint64_t total_clusters;
	24	uint64_t fragmented_clusters;
	25	} BlockFragInfo;
	26
	27	typedef struct QEMUSnapshotInfo {
	28	char id_str[128]; /* unique snapshot id */
	29	/* the following fields are informative. They are not needed for
	30	the consistency of the snapshot */
	31	char name[256]; /* user chosen name */
	32	uint64_t vm_state_size; /* VM state info size */
	33	uint32_t date_sec; /* UTC date of the snapshot */
	34	uint32_t date_nsec;
	35	uint64_t vm_clock_nsec; /* VM clock relative to boot */
	36	} QEMUSnapshotInfo;
	37
	38	/* Callbacks for block device models */
	39	typedef struct BlockDevOps {
	40	/*
	41	* Runs when virtual media changed (monitor commands eject, change)
	42	* Argument load is true on load and false on eject.
	43	* Beware: doesn't run when a host device's physical media
	44	* changes. Sure would be useful if it did.
	45	* Device models with removable media must implement this callback.
	46	*/
	47	void (change_media_cb)(void opaque, bool load);
	48	/*
	49	* Runs when an eject request is issued from the monitor, the tray
	50	* is closed, and the medium is locked.
	51	* Device models that do not implement is_medium_locked will not need
	52	* this callback. Device models that can lock the medium or tray might
	53	* want to implement the callback and unlock the tray when "force" is
	54	* true, even if they do not support eject requests.
	55	*/
	56	void (eject_request_cb)(void opaque, bool force);
	57	/*
	58	* Is the virtual tray open?
	59	* Device models implement this only when the device has a tray.
	60	*/
	61	bool (is_tray_open)(void opaque);
	62	/*
	63	* Is the virtual medium locked into the device?
	64	* Device models implement this only when device has such a lock.
	65	*/
	66	bool (is_medium_locked)(void opaque);
	67	/*
	68	* Runs when the size changed (e.g. monitor command block_resize)
	69	*/
	70	void (resize_cb)(void opaque);
	71	} BlockDevOps;
	72
	73	#define BDRV_O_RDWR 0x0002
	74	#define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
	75	#define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
	76	#define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
	77	#define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
	78	#define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
	79	#define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
	80	#define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
	81	#define BDRV_O_INCOMING 0x0800 /* consistency hint for incoming migration */
	82
	83	#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE \| BDRV_O_CACHE_WB \| BDRV_O_NO_FLUSH)
	84
	85	#define BDRV_SECTOR_BITS 9
	86	#define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
	87	#define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
	88
	89	typedef enum {
	90	BLOCK_ERR_REPORT, BLOCK_ERR_IGNORE, BLOCK_ERR_STOP_ENOSPC,
	91	BLOCK_ERR_STOP_ANY
	92	} BlockErrorAction;
	93
	94	typedef enum {
	95	BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
	96	} BlockQMPEventAction;
	97
	98	void bdrv_iostatus_enable(BlockDriverState *bs);
	99	void bdrv_iostatus_reset(BlockDriverState *bs);
	100	void bdrv_iostatus_disable(BlockDriverState *bs);
	101	bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
	102	void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
	103	void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
	104	BlockQMPEventAction action, int is_read);
	105	void bdrv_info_print(Monitor mon, const QObject data);
	106	void bdrv_info(Monitor mon, QObject *ret_data);
	107	void bdrv_stats_print(Monitor mon, const QObject data);
	108	void bdrv_info_stats(Monitor mon, QObject *ret_data);
	109
	110	/* disk I/O throttling */
	111	void bdrv_io_limits_enable(BlockDriverState *bs);
	112	void bdrv_io_limits_disable(BlockDriverState *bs);
	113	bool bdrv_io_limits_enabled(BlockDriverState *bs);
	114
	115	void bdrv_init(void);
	116	void bdrv_init_with_whitelist(void);
	117	BlockDriver bdrv_find_protocol(const char filename);
	118	BlockDriver bdrv_find_format(const char format_name);
	119	BlockDriver bdrv_find_whitelisted_format(const char format_name);
	120	int bdrv_create(BlockDriver drv, const char filename,
	121	QEMUOptionParameter *options);
	122	int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
	123	BlockDriverState bdrv_new(const char device_name);
	124	void bdrv_make_anon(BlockDriverState *bs);
	125	void bdrv_append(BlockDriverState bs_new, BlockDriverState bs_top);
	126	void bdrv_delete(BlockDriverState *bs);
	127	int bdrv_parse_cache_flags(const char mode, int flags);
	128	int bdrv_file_open(BlockDriverState *pbs, const char filename, int flags);
	129	int bdrv_open(BlockDriverState bs, const char filename, int flags,
	130	BlockDriver *drv);
	131	void bdrv_close(BlockDriverState *bs);
	132	int bdrv_attach_dev(BlockDriverState bs, void dev);
	133	void bdrv_attach_dev_nofail(BlockDriverState bs, void dev);
	134	void bdrv_detach_dev(BlockDriverState bs, void dev);
	135	void bdrv_get_attached_dev(BlockDriverState bs);
	136	void bdrv_set_dev_ops(BlockDriverState bs, const BlockDevOps ops,
	137	void *opaque);
	138	void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
	139	bool bdrv_dev_has_removable_media(BlockDriverState *bs);
	140	bool bdrv_dev_is_tray_open(BlockDriverState *bs);
	141	bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
	142	int bdrv_read(BlockDriverState *bs, int64_t sector_num,
	143	uint8_t *buf, int nb_sectors);
	144	int bdrv_write(BlockDriverState *bs, int64_t sector_num,
	145	const uint8_t *buf, int nb_sectors);
	146	int bdrv_pread(BlockDriverState *bs, int64_t offset,
	147	void *buf, int count);
	148	int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
	149	const void *buf, int count);
	150	int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
	151	const void *buf, int count);
	152	int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
	153	int nb_sectors, QEMUIOVector *qiov);
	154	int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
	155	int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
	156	int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
	157	int nb_sectors, QEMUIOVector *qiov);
	158	/*
	159	* Efficiently zero a region of the disk image. Note that this is a regular
	160	* I/O request like read or write and should have a reasonable size. This
	161	* function is not suitable for zeroing the entire image in a single request
	162	* because it may allocate memory for the entire region.
	163	*/
	164	int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
	165	int nb_sectors);
	166	int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
	167	int nb_sectors, int *pnum);
	168	BlockDriverState bdrv_find_backing_image(BlockDriverState bs,
	169	const char *backing_file);
	170	int bdrv_truncate(BlockDriverState *bs, int64_t offset);
	171	int64_t bdrv_getlength(BlockDriverState *bs);
	172	int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
	173	void bdrv_get_geometry(BlockDriverState bs, uint64_t nb_sectors_ptr);
	174	void bdrv_guess_geometry(BlockDriverState bs, int pcyls, int pheads, int psecs);
	175	int bdrv_commit(BlockDriverState *bs);
	176	int bdrv_commit_all(void);
	177	int bdrv_change_backing_file(BlockDriverState *bs,
	178	const char backing_file, const char backing_fmt);
	179	void bdrv_register(BlockDriver *bdrv);
	180
	181
	182	typedef struct BdrvCheckResult {
	183	int corruptions;
	184	int leaks;
	185	int check_errors;
	186	BlockFragInfo bfi;
	187	} BdrvCheckResult;
	188
	189	int bdrv_check(BlockDriverState bs, BdrvCheckResult res);
	190
	191	/* async block I/O */
	192	typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
	193	int sector_num);
	194	BlockDriverAIOCB bdrv_aio_readv(BlockDriverState bs, int64_t sector_num,
	195	QEMUIOVector *iov, int nb_sectors,
	196	BlockDriverCompletionFunc cb, void opaque);
	197	BlockDriverAIOCB bdrv_aio_writev(BlockDriverState bs, int64_t sector_num,
	198	QEMUIOVector *iov, int nb_sectors,
	199	BlockDriverCompletionFunc cb, void opaque);
	200	BlockDriverAIOCB bdrv_aio_flush(BlockDriverState bs,
	201	BlockDriverCompletionFunc cb, void opaque);
	202	BlockDriverAIOCB bdrv_aio_discard(BlockDriverState bs,
	203	int64_t sector_num, int nb_sectors,
	204	BlockDriverCompletionFunc cb, void opaque);
	205	void bdrv_aio_cancel(BlockDriverAIOCB *acb);
	206
	207	typedef struct BlockRequest {
	208	/* Fields to be filled by multiwrite caller */
	209	int64_t sector;
	210	int nb_sectors;
	211	QEMUIOVector *qiov;
	212	BlockDriverCompletionFunc *cb;
	213	void *opaque;
	214
	215	/* Filled by multiwrite implementation */
	216	int error;
	217	} BlockRequest;
	218
	219	int bdrv_aio_multiwrite(BlockDriverState bs, BlockRequest reqs,
	220	int num_reqs);
	221
	222	/* sg packet commands */
	223	int bdrv_ioctl(BlockDriverState bs, unsigned long int req, void buf);
	224	BlockDriverAIOCB bdrv_aio_ioctl(BlockDriverState bs,
	225	unsigned long int req, void *buf,
	226	BlockDriverCompletionFunc cb, void opaque);
	227
	228	/* Invalidate any cached metadata used by image formats */
	229	void bdrv_invalidate_cache(BlockDriverState *bs);
	230	void bdrv_invalidate_cache_all(void);
	231
	232	void bdrv_clear_incoming_migration_all(void);
	233
	234	/* Ensure contents are flushed to disk. */
	235	int bdrv_flush(BlockDriverState *bs);
	236	int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
	237	void bdrv_flush_all(void);
	238	void bdrv_close_all(void);
	239	void bdrv_drain_all(void);
	240
	241	int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
	242	int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
	243	int bdrv_has_zero_init(BlockDriverState *bs);
	244	int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
	245	int *pnum);
	246
	247	#define BIOS_ATA_TRANSLATION_AUTO 0
	248	#define BIOS_ATA_TRANSLATION_NONE 1
	249	#define BIOS_ATA_TRANSLATION_LBA 2
	250	#define BIOS_ATA_TRANSLATION_LARGE 3
	251	#define BIOS_ATA_TRANSLATION_RECHS 4
	252
	253	void bdrv_set_geometry_hint(BlockDriverState *bs,
	254	int cyls, int heads, int secs);
	255	void bdrv_set_translation_hint(BlockDriverState *bs, int translation);
	256	void bdrv_get_geometry_hint(BlockDriverState *bs,
	257	int pcyls, int pheads, int *psecs);
	258	typedef enum FDriveType {
	259	FDRIVE_DRV_144 = 0x00, /* 1.44 MB 3"5 drive */
	260	FDRIVE_DRV_288 = 0x01, /* 2.88 MB 3"5 drive */
	261	FDRIVE_DRV_120 = 0x02, /* 1.2 MB 5"25 drive */
	262	FDRIVE_DRV_NONE = 0x03, /* No drive connected */
	263	} FDriveType;
	264
	265	typedef enum FDriveRate {
	266	FDRIVE_RATE_500K = 0x00, /* 500 Kbps */
	267	FDRIVE_RATE_300K = 0x01, /* 300 Kbps */
	268	FDRIVE_RATE_250K = 0x02, /* 250 Kbps */
	269	FDRIVE_RATE_1M = 0x03, /* 1 Mbps */
	270	} FDriveRate;
	271
	272	void bdrv_get_floppy_geometry_hint(BlockDriverState bs, int nb_heads,
	273	int max_track, int last_sect,
	274	FDriveType drive_in, FDriveType *drive,
	275	FDriveRate *rate);
	276	int bdrv_get_translation_hint(BlockDriverState *bs);
	277	void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
	278	BlockErrorAction on_write_error);
	279	BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
	280	int bdrv_is_read_only(BlockDriverState *bs);
	281	int bdrv_is_sg(BlockDriverState *bs);
	282	int bdrv_enable_write_cache(BlockDriverState *bs);
	283	int bdrv_is_inserted(BlockDriverState *bs);
	284	int bdrv_media_changed(BlockDriverState *bs);
	285	void bdrv_lock_medium(BlockDriverState *bs, bool locked);
	286	void bdrv_eject(BlockDriverState *bs, bool eject_flag);
	287	void bdrv_get_format(BlockDriverState bs, char buf, int buf_size);
	288	BlockDriverState bdrv_find(const char name);
	289	BlockDriverState bdrv_next(BlockDriverState bs);
	290	void bdrv_iterate(void (it)(void opaque, BlockDriverState *bs),
	291	void *opaque);
	292	int bdrv_is_encrypted(BlockDriverState *bs);
	293	int bdrv_key_required(BlockDriverState *bs);
	294	int bdrv_set_key(BlockDriverState bs, const char key);
	295	int bdrv_query_missing_keys(void);
	296	void bdrv_iterate_format(void (it)(void opaque, const char *name),
	297	void *opaque);
	298	const char bdrv_get_device_name(BlockDriverState bs);
	299	int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
	300	const uint8_t *buf, int nb_sectors);
	301	int bdrv_get_info(BlockDriverState bs, BlockDriverInfo bdi);
	302
	303	const char bdrv_get_encrypted_filename(BlockDriverState bs);
	304	void bdrv_get_backing_filename(BlockDriverState *bs,
	305	char *filename, int filename_size);
	306	int bdrv_can_snapshot(BlockDriverState *bs);
	307	int bdrv_is_snapshot(BlockDriverState *bs);
	308	BlockDriverState *bdrv_snapshots(void);
	309	int bdrv_snapshot_create(BlockDriverState *bs,
	310	QEMUSnapshotInfo *sn_info);
	311	int bdrv_snapshot_goto(BlockDriverState *bs,
	312	const char *snapshot_id);
	313	int bdrv_snapshot_delete(BlockDriverState bs, const char snapshot_id);
	314	int bdrv_snapshot_list(BlockDriverState *bs,
	315	QEMUSnapshotInfo **psn_info);
	316	int bdrv_snapshot_load_tmp(BlockDriverState *bs,
	317	const char *snapshot_name);
	318	char bdrv_snapshot_dump(char buf, int buf_size, QEMUSnapshotInfo *sn);
	319
	320	char get_human_readable_size(char buf, int buf_size, int64_t size);
	321	int path_is_absolute(const char *path);
	322	void path_combine(char *dest, int dest_size,
	323	const char *base_path,
	324	const char *filename);
	325
	326	int bdrv_save_vmstate(BlockDriverState bs, const uint8_t buf,
	327	int64_t pos, int size);
	328
	329	int bdrv_load_vmstate(BlockDriverState bs, uint8_t buf,
	330	int64_t pos, int size);
	331
	332	int bdrv_img_create(const char filename, const char fmt,
	333	const char base_filename, const char base_fmt,
	334	char *options, uint64_t img_size, int flags);
	335
	336	void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
	337	void qemu_blockalign(BlockDriverState bs, size_t size);
	338
	339	#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
	340
	341	void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
	342	int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
	343	void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
	344	int nr_sectors);
	345	int64_t bdrv_get_dirty_count(BlockDriverState *bs);
	346
	347	void bdrv_enable_copy_on_read(BlockDriverState *bs);
	348	void bdrv_disable_copy_on_read(BlockDriverState *bs);
	349
	350	void bdrv_set_in_use(BlockDriverState *bs, int in_use);
	351	int bdrv_in_use(BlockDriverState *bs);
	352
	353	enum BlockAcctType {
	354	BDRV_ACCT_READ,
	355	BDRV_ACCT_WRITE,
	356	BDRV_ACCT_FLUSH,
	357	BDRV_MAX_IOTYPE,
	358	};
	359
	360	typedef struct BlockAcctCookie {
	361	int64_t bytes;
	362	int64_t start_time_ns;
	363	enum BlockAcctType type;
	364	} BlockAcctCookie;
	365
	366	void bdrv_acct_start(BlockDriverState bs, BlockAcctCookie cookie,
	367	int64_t bytes, enum BlockAcctType type);
	368	void bdrv_acct_done(BlockDriverState bs, BlockAcctCookie cookie);
	369
	370	typedef enum {
	371	BLKDBG_L1_UPDATE,
	372
	373	BLKDBG_L1_GROW_ALLOC_TABLE,
	374	BLKDBG_L1_GROW_WRITE_TABLE,
	375	BLKDBG_L1_GROW_ACTIVATE_TABLE,
	376
	377	BLKDBG_L2_LOAD,
	378	BLKDBG_L2_UPDATE,
	379	BLKDBG_L2_UPDATE_COMPRESSED,
	380	BLKDBG_L2_ALLOC_COW_READ,
	381	BLKDBG_L2_ALLOC_WRITE,
	382
	383	BLKDBG_READ,
	384	BLKDBG_READ_AIO,
	385	BLKDBG_READ_BACKING,
	386	BLKDBG_READ_BACKING_AIO,
	387	BLKDBG_READ_COMPRESSED,
	388
	389	BLKDBG_WRITE_AIO,
	390	BLKDBG_WRITE_COMPRESSED,
	391
	392	BLKDBG_VMSTATE_LOAD,
	393	BLKDBG_VMSTATE_SAVE,
	394
	395	BLKDBG_COW_READ,
	396	BLKDBG_COW_WRITE,
	397
	398	BLKDBG_REFTABLE_LOAD,
	399	BLKDBG_REFTABLE_GROW,
	400
	401	BLKDBG_REFBLOCK_LOAD,
	402	BLKDBG_REFBLOCK_UPDATE,
	403	BLKDBG_REFBLOCK_UPDATE_PART,
	404	BLKDBG_REFBLOCK_ALLOC,
	405	BLKDBG_REFBLOCK_ALLOC_HOOKUP,
	406	BLKDBG_REFBLOCK_ALLOC_WRITE,
	407	BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
	408	BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
	409	BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
	410
	411	BLKDBG_CLUSTER_ALLOC,
	412	BLKDBG_CLUSTER_ALLOC_BYTES,
	413	BLKDBG_CLUSTER_FREE,
	414
	415	BLKDBG_EVENT_MAX,
	416	} BlkDebugEvent;
	417
	418	#define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
	419	void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
	420
	421
	422	/* Convenience for block device models */
	423
	424	typedef struct BlockConf {
	425	BlockDriverState *bs;
	426	uint16_t physical_block_size;
	427	uint16_t logical_block_size;
	428	uint16_t min_io_size;
	429	uint32_t opt_io_size;
	430	int32_t bootindex;
	431	uint32_t discard_granularity;
	432	} BlockConf;
	433
	434	static inline unsigned int get_physical_block_exp(BlockConf *conf)
	435	{
	436	unsigned int exp = 0, size;
	437
	438	for (size = conf->physical_block_size;
	439	size > conf->logical_block_size;
	440	size >>= 1) {
	441	exp++;
	442	}
	443
	444	return exp;
	445	}
	446
	447	#define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
	448	DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \
	449	DEFINE_PROP_BLOCKSIZE("logical_block_size", _state, \
	450	_conf.logical_block_size, 512), \
	451	DEFINE_PROP_BLOCKSIZE("physical_block_size", _state, \
	452	_conf.physical_block_size, 512), \
	453	DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \
	454	DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \
	455	DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1), \
	456	DEFINE_PROP_UINT32("discard_granularity", _state, \
	457	_conf.discard_granularity, 0)
	458
	459	#endif
	460