Archipelago » qemu

#ifndef BLOCK_H

#define BLOCK_H

#include "block/aio.h"

#include "qemu-common.h"

#include "qemu/option.h"

#include "block/coroutine.h"

#include "qapi/qmp/qobject.h"

#include "qapi-types.h"

/* block.c */

typedef struct BlockDriver BlockDriver;

typedef struct BlockJob BlockJob;

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;

    uint64_t compressed_clusters;

} BlockFragInfo;

/* 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_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */

#define BDRV_O_UNMAP       0x4000  /* execute guest UNMAP/TRIM operations */

#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)

/* BDRV_BLOCK_DATA: data is read from bs->file or another file

 * BDRV_BLOCK_ZERO: sectors read as zero

 * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data

 *

 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in

 * bs->file where sector data can be read from as raw data.

 *

 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.

 *

 * DATA ZERO OFFSET_VALID

 *  t    t        t       sectors read as zero, bs->file is zero at offset

 *  t    f        t       sectors read as valid from bs->file at offset

 *  f    t        t       sectors preallocated, read as zero, bs->file not

 *                        necessarily zero at offset

 *  f    f        t       sectors preallocated but read from backing_hd,

 *                        bs->file contains garbage at offset

 *  t    t        f       sectors preallocated, read as zero, unknown offset

 *  t    f        f       sectors read from unknown file or offset

 *  f    t        f       not allocated or unknown offset, read as zero

 *  f    f        f       not allocated or unknown offset, read from backing_hd

 */

#define BDRV_BLOCK_DATA         1

#define BDRV_BLOCK_ZERO         2

#define BDRV_BLOCK_OFFSET_VALID 4

#define BDRV_BLOCK_OFFSET_MASK  BDRV_SECTOR_MASK

typedef enum {

    BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP

} BlockErrorAction;

typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;

typedef struct BDRVReopenState {

    BlockDriverState *bs;

    int flags;

    void *opaque;

} BDRVReopenState;

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_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);

void bdrv_init(void);

void bdrv_init_with_whitelist(void);

BlockDriver *bdrv_find_protocol(const char *filename,

                                bool allow_protocol_prefix);

BlockDriver *bdrv_find_format(const char *format_name);

BlockDriver *bdrv_find_whitelisted_format(const char *format_name,

                                          bool readonly);

int bdrv_create(BlockDriver *drv, const char* filename,

    QEMUOptionParameter *options, Error **errp);

int bdrv_create_file(const char* filename, QEMUOptionParameter *options,

                     Error **errp);

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);

int bdrv_parse_cache_flags(const char *mode, int *flags);

int bdrv_parse_discard_flags(const char *mode, int *flags);

int bdrv_file_open(BlockDriverState **pbs, const char *filename,

                   QDict *options, int flags, Error **errp);

int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);

int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,

              int flags, BlockDriver *drv, Error **errp);

BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,

                                    BlockDriverState *bs, int flags);

int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);

int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);

int bdrv_reopen_prepare(BDRVReopenState *reopen_state,

                        BlockReopenQueue *queue, Error **errp);

void bdrv_reopen_commit(BDRVReopenState *reopen_state);

void bdrv_reopen_abort(BDRVReopenState *reopen_state);

void bdrv_close(BlockDriverState *bs);

void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify);

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_write_zeroes(BlockDriverState *bs, int64_t sector_num,

               int nb_sectors);

int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov);

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_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);

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);

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);

int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,

                           BlockDriverState *base);

BlockDriverState *bdrv_find_overlay(BlockDriverState *active,

                                    BlockDriverState *bs);

BlockDriverState *bdrv_find_base(BlockDriverState *bs);

typedef struct BdrvCheckResult {

    int corruptions;

    int leaks;

    int check_errors;

    int corruptions_fixed;

    int leaks_fixed;

    int64_t image_end_offset;

    BlockFragInfo bfi;

} BdrvCheckResult;

typedef enum {

    BDRV_FIX_LEAKS    = 1,

    BDRV_FIX_ERRORS   = 2,

} BdrvCheckMode;

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

int bdrv_amend_options(BlockDriverState *bs_new, QEMUOptionParameter *options);

/* 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);

int 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_1(BlockDriverState *bs);

int bdrv_has_zero_init(BlockDriverState *bs);

int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,

                              int nb_sectors, int *pnum);

int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,

                      int *pnum);

int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,

                            int64_t sector_num, int nb_sectors, int *pnum);

void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,

                       BlockdevOnError on_write_error);

BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);

BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);

void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,

                       bool is_read, int error);

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);

void bdrv_round_to_clusters(BlockDriverState *bs,

                            int64_t sector_num, int nb_sectors,

                            int64_t *cluster_sector_num,

                            int *cluster_nb_sectors);

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_is_snapshot(BlockDriverState *bs);

int path_is_absolute(const char *path);

void path_combine(char *dest, int dest_size,

                  const char *base_path,

                  const char *filename);

int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);

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);

void 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,

                     Error **errp, bool quiet);

void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);

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

bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);

struct HBitmapIter;

void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity);

int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);

void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);

void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);

void bdrv_dirty_iter_init(BlockDriverState *bs, struct HBitmapIter *hbi);

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_ref(BlockDriverState *bs);

void bdrv_unref(BlockDriverState *bs);

void bdrv_set_in_use(BlockDriverState *bs, int in_use);

int bdrv_in_use(BlockDriverState *bs);

#ifdef CONFIG_LINUX_AIO

int raw_get_aio_fd(BlockDriverState *bs);

#else

static inline int raw_get_aio_fd(BlockDriverState *bs)

{

    return -ENOTSUP;

}

#endif

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_REFTABLE_UPDATE,

    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_FLUSH_TO_OS,

    BLKDBG_FLUSH_TO_DISK,

    BLKDBG_EVENT_MAX,

} BlkDebugEvent;

#define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)

void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);

int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,

                           const char *tag);

int bdrv_debug_resume(BlockDriverState *bs, const char *tag);

bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);

#endif