Archipelago » qemu

#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_CHECK       0x1000  /* open solely for consistency check */

#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_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);

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_read_unthrottled(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);

int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,

                                            BlockDriverState *base,

                                            int64_t sector_num,

                                            int nb_sectors, int *pnum);

BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,

    const char *backing_file);

int bdrv_get_backing_file_depth(BlockDriverState *bs);

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);

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;

    int corruptions_fixed;

    int leaks_fixed;

    BlockFragInfo bfi;

} BdrvCheckResult;

typedef enum {

    BDRV_FIX_LEAKS    = 1,

    BDRV_FIX_ERRORS   = 2,

} BdrvCheckMode;

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

/* 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);

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);

void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);

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);

const char *bdrv_get_format_name(BlockDriverState *bs);

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_get_flags(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);

void bdrv_get_full_backing_filename(BlockDriverState *bs,

                                    char *dest, size_t sz);

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_AIO,

    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);

#endif