[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"
#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;
} 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_ALLOW_RDWR  0x2000  /* allow reopen to change from r/o to r/w */

#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 {
    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);
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_backing_file(BlockDriverState *bs);
int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
              BlockDriver *drv);
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_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);
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;
    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, 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);

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);
BlockInfo *bdrv_query_info(BlockDriverState *s);
BlockStats *bdrv_query_stats(const BlockDriverState *bs);
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_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
int64_t bdrv_get_next_dirty(BlockDriverState *bs, int64_t sector);
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
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	#include "qapi-types.h"
	10
	11	/* block.c */
	12	typedef struct BlockDriver BlockDriver;
	13	typedef struct BlockJob BlockJob;
	14
	15	typedef struct BlockDriverInfo {
	16	/* in bytes, 0 if irrelevant */
	17	int cluster_size;
	18	/* offset at which the VM state can be saved (0 if not possible) */
	19	int64_t vm_state_offset;
	20	bool is_dirty;
	21	} BlockDriverInfo;
	22
	23	typedef struct BlockFragInfo {
	24	uint64_t allocated_clusters;
	25	uint64_t total_clusters;
	26	uint64_t fragmented_clusters;
	27	} BlockFragInfo;
	28
	29	typedef struct QEMUSnapshotInfo {
	30	char id_str[128]; /* unique snapshot id */
	31	/* the following fields are informative. They are not needed for
	32	the consistency of the snapshot */
	33	char name[256]; /* user chosen name */
	34	uint64_t vm_state_size; /* VM state info size */
	35	uint32_t date_sec; /* UTC date of the snapshot */
	36	uint32_t date_nsec;
	37	uint64_t vm_clock_nsec; /* VM clock relative to boot */
	38	} QEMUSnapshotInfo;
	39
	40	/* Callbacks for block device models */
	41	typedef struct BlockDevOps {
	42	/*
	43	* Runs when virtual media changed (monitor commands eject, change)
	44	* Argument load is true on load and false on eject.
	45	* Beware: doesn't run when a host device's physical media
	46	* changes. Sure would be useful if it did.
	47	* Device models with removable media must implement this callback.
	48	*/
	49	void (change_media_cb)(void opaque, bool load);
	50	/*
	51	* Runs when an eject request is issued from the monitor, the tray
	52	* is closed, and the medium is locked.
	53	* Device models that do not implement is_medium_locked will not need
	54	* this callback. Device models that can lock the medium or tray might
	55	* want to implement the callback and unlock the tray when "force" is
	56	* true, even if they do not support eject requests.
	57	*/
	58	void (eject_request_cb)(void opaque, bool force);
	59	/*
	60	* Is the virtual tray open?
	61	* Device models implement this only when the device has a tray.
	62	*/
	63	bool (is_tray_open)(void opaque);
	64	/*
	65	* Is the virtual medium locked into the device?
	66	* Device models implement this only when device has such a lock.
	67	*/
	68	bool (is_medium_locked)(void opaque);
	69	/*
	70	* Runs when the size changed (e.g. monitor command block_resize)
	71	*/
	72	void (resize_cb)(void opaque);
	73	} BlockDevOps;
	74
	75	#define BDRV_O_RDWR 0x0002
	76	#define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
	77	#define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
	78	#define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
	79	#define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
	80	#define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
	81	#define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
	82	#define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
	83	#define BDRV_O_INCOMING 0x0800 /* consistency hint for incoming migration */
	84	#define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
	85	#define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
	86
	87	#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE \| BDRV_O_CACHE_WB \| BDRV_O_NO_FLUSH)
	88
	89	#define BDRV_SECTOR_BITS 9
	90	#define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
	91	#define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
	92
	93	typedef enum {
	94	BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
	95	} BlockErrorAction;
	96
	97	typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
	98
	99	typedef struct BDRVReopenState {
	100	BlockDriverState *bs;
	101	int flags;
	102	void *opaque;
	103	} BDRVReopenState;
	104
	105
	106	void bdrv_iostatus_enable(BlockDriverState *bs);
	107	void bdrv_iostatus_reset(BlockDriverState *bs);
	108	void bdrv_iostatus_disable(BlockDriverState *bs);
	109	bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
	110	void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
	111	void bdrv_info_print(Monitor mon, const QObject data);
	112	void bdrv_info(Monitor mon, QObject *ret_data);
	113	void bdrv_stats_print(Monitor mon, const QObject data);
	114	void bdrv_info_stats(Monitor mon, QObject *ret_data);
	115
	116	/* disk I/O throttling */
	117	void bdrv_io_limits_enable(BlockDriverState *bs);
	118	void bdrv_io_limits_disable(BlockDriverState *bs);
	119	bool bdrv_io_limits_enabled(BlockDriverState *bs);
	120
	121	void bdrv_init(void);
	122	void bdrv_init_with_whitelist(void);
	123	BlockDriver bdrv_find_protocol(const char filename);
	124	BlockDriver bdrv_find_format(const char format_name);
	125	BlockDriver bdrv_find_whitelisted_format(const char format_name);
	126	int bdrv_create(BlockDriver drv, const char filename,
	127	QEMUOptionParameter *options);
	128	int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
	129	BlockDriverState bdrv_new(const char device_name);
	130	void bdrv_make_anon(BlockDriverState *bs);
	131	void bdrv_swap(BlockDriverState bs_new, BlockDriverState bs_old);
	132	void bdrv_append(BlockDriverState bs_new, BlockDriverState bs_top);
	133	void bdrv_delete(BlockDriverState *bs);
	134	int bdrv_parse_cache_flags(const char mode, int flags);
	135	int bdrv_file_open(BlockDriverState *pbs, const char filename, int flags);
	136	int bdrv_open_backing_file(BlockDriverState *bs);
	137	int bdrv_open(BlockDriverState bs, const char filename, int flags,
	138	BlockDriver *drv);
	139	BlockReopenQueue bdrv_reopen_queue(BlockReopenQueue bs_queue,
	140	BlockDriverState *bs, int flags);
	141	int bdrv_reopen_multiple(BlockReopenQueue bs_queue, Error *errp);
	142	int bdrv_reopen(BlockDriverState bs, int bdrv_flags, Error *errp);
	143	int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
	144	BlockReopenQueue queue, Error *errp);
	145	void bdrv_reopen_commit(BDRVReopenState *reopen_state);
	146	void bdrv_reopen_abort(BDRVReopenState *reopen_state);
	147	void bdrv_close(BlockDriverState *bs);
	148	void bdrv_add_close_notifier(BlockDriverState bs, Notifier notify);
	149	int bdrv_attach_dev(BlockDriverState bs, void dev);
	150	void bdrv_attach_dev_nofail(BlockDriverState bs, void dev);
	151	void bdrv_detach_dev(BlockDriverState bs, void dev);
	152	void bdrv_get_attached_dev(BlockDriverState bs);
	153	void bdrv_set_dev_ops(BlockDriverState bs, const BlockDevOps ops,
	154	void *opaque);
	155	void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
	156	bool bdrv_dev_has_removable_media(BlockDriverState *bs);
	157	bool bdrv_dev_is_tray_open(BlockDriverState *bs);
	158	bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
	159	int bdrv_read(BlockDriverState *bs, int64_t sector_num,
	160	uint8_t *buf, int nb_sectors);
	161	int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
	162	uint8_t *buf, int nb_sectors);
	163	int bdrv_write(BlockDriverState *bs, int64_t sector_num,
	164	const uint8_t *buf, int nb_sectors);
	165	int bdrv_pread(BlockDriverState *bs, int64_t offset,
	166	void *buf, int count);
	167	int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
	168	const void *buf, int count);
	169	int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
	170	const void *buf, int count);
	171	int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
	172	int nb_sectors, QEMUIOVector *qiov);
	173	int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
	174	int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
	175	int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
	176	int nb_sectors, QEMUIOVector *qiov);
	177	/*
	178	* Efficiently zero a region of the disk image. Note that this is a regular
	179	* I/O request like read or write and should have a reasonable size. This
	180	* function is not suitable for zeroing the entire image in a single request
	181	* because it may allocate memory for the entire region.
	182	*/
	183	int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
	184	int nb_sectors);
	185	int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
	186	int nb_sectors, int *pnum);
	187	int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
	188	BlockDriverState *base,
	189	int64_t sector_num,
	190	int nb_sectors, int *pnum);
	191	BlockDriverState bdrv_find_backing_image(BlockDriverState bs,
	192	const char *backing_file);
	193	int bdrv_get_backing_file_depth(BlockDriverState *bs);
	194	int bdrv_truncate(BlockDriverState *bs, int64_t offset);
	195	int64_t bdrv_getlength(BlockDriverState *bs);
	196	int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
	197	void bdrv_get_geometry(BlockDriverState bs, uint64_t nb_sectors_ptr);
	198	int bdrv_commit(BlockDriverState *bs);
	199	int bdrv_commit_all(void);
	200	int bdrv_change_backing_file(BlockDriverState *bs,
	201	const char backing_file, const char backing_fmt);
	202	void bdrv_register(BlockDriver *bdrv);
	203	int bdrv_drop_intermediate(BlockDriverState active, BlockDriverState top,
	204	BlockDriverState *base);
	205	BlockDriverState bdrv_find_overlay(BlockDriverState active,
	206	BlockDriverState *bs);
	207	BlockDriverState bdrv_find_base(BlockDriverState bs);
	208
	209
	210	typedef struct BdrvCheckResult {
	211	int corruptions;
	212	int leaks;
	213	int check_errors;
	214	int corruptions_fixed;
	215	int leaks_fixed;
	216	BlockFragInfo bfi;
	217	} BdrvCheckResult;
	218
	219	typedef enum {
	220	BDRV_FIX_LEAKS = 1,
	221	BDRV_FIX_ERRORS = 2,
	222	} BdrvCheckMode;
	223
	224	int bdrv_check(BlockDriverState bs, BdrvCheckResult res, BdrvCheckMode fix);
	225
	226	/* async block I/O */
	227	typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
	228	int sector_num);
	229	BlockDriverAIOCB bdrv_aio_readv(BlockDriverState bs, int64_t sector_num,
	230	QEMUIOVector *iov, int nb_sectors,
	231	BlockDriverCompletionFunc cb, void opaque);
	232	BlockDriverAIOCB bdrv_aio_writev(BlockDriverState bs, int64_t sector_num,
	233	QEMUIOVector *iov, int nb_sectors,
	234	BlockDriverCompletionFunc cb, void opaque);
	235	BlockDriverAIOCB bdrv_aio_flush(BlockDriverState bs,
	236	BlockDriverCompletionFunc cb, void opaque);
	237	BlockDriverAIOCB bdrv_aio_discard(BlockDriverState bs,
	238	int64_t sector_num, int nb_sectors,
	239	BlockDriverCompletionFunc cb, void opaque);
	240	void bdrv_aio_cancel(BlockDriverAIOCB *acb);
	241
	242	typedef struct BlockRequest {
	243	/* Fields to be filled by multiwrite caller */
	244	int64_t sector;
	245	int nb_sectors;
	246	QEMUIOVector *qiov;
	247	BlockDriverCompletionFunc *cb;
	248	void *opaque;
	249
	250	/* Filled by multiwrite implementation */
	251	int error;
	252	} BlockRequest;
	253
	254	int bdrv_aio_multiwrite(BlockDriverState bs, BlockRequest reqs,
	255	int num_reqs);
	256
	257	/* sg packet commands */
	258	int bdrv_ioctl(BlockDriverState bs, unsigned long int req, void buf);
	259	BlockDriverAIOCB bdrv_aio_ioctl(BlockDriverState bs,
	260	unsigned long int req, void *buf,
	261	BlockDriverCompletionFunc cb, void opaque);
	262
	263	/* Invalidate any cached metadata used by image formats */
	264	void bdrv_invalidate_cache(BlockDriverState *bs);
	265	void bdrv_invalidate_cache_all(void);
	266
	267	void bdrv_clear_incoming_migration_all(void);
	268
	269	/* Ensure contents are flushed to disk. */
	270	int bdrv_flush(BlockDriverState *bs);
	271	int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
	272	void bdrv_flush_all(void);
	273	void bdrv_close_all(void);
	274	void bdrv_drain_all(void);
	275
	276	int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
	277	int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
	278	int bdrv_has_zero_init(BlockDriverState *bs);
	279	int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
	280	int *pnum);
	281
	282	void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
	283	BlockdevOnError on_write_error);
	284	BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read);
	285	BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error);
	286	void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
	287	bool is_read, int error);
	288	int bdrv_is_read_only(BlockDriverState *bs);
	289	int bdrv_is_sg(BlockDriverState *bs);
	290	int bdrv_enable_write_cache(BlockDriverState *bs);
	291	void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
	292	int bdrv_is_inserted(BlockDriverState *bs);
	293	int bdrv_media_changed(BlockDriverState *bs);
	294	void bdrv_lock_medium(BlockDriverState *bs, bool locked);
	295	void bdrv_eject(BlockDriverState *bs, bool eject_flag);
	296	const char bdrv_get_format_name(BlockDriverState bs);
	297	BlockDriverState bdrv_find(const char name);
	298	BlockDriverState bdrv_next(BlockDriverState bs);
	299	void bdrv_iterate(void (it)(void opaque, BlockDriverState *bs),
	300	void *opaque);
	301	int bdrv_is_encrypted(BlockDriverState *bs);
	302	int bdrv_key_required(BlockDriverState *bs);
	303	int bdrv_set_key(BlockDriverState bs, const char key);
	304	int bdrv_query_missing_keys(void);
	305	void bdrv_iterate_format(void (it)(void opaque, const char *name),
	306	void *opaque);
	307	const char bdrv_get_device_name(BlockDriverState bs);
	308	int bdrv_get_flags(BlockDriverState *bs);
	309	int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
	310	const uint8_t *buf, int nb_sectors);
	311	int bdrv_get_info(BlockDriverState bs, BlockDriverInfo bdi);
	312
	313	const char bdrv_get_encrypted_filename(BlockDriverState bs);
	314	void bdrv_get_backing_filename(BlockDriverState *bs,
	315	char *filename, int filename_size);
	316	void bdrv_get_full_backing_filename(BlockDriverState *bs,
	317	char *dest, size_t sz);
	318	BlockInfo bdrv_query_info(BlockDriverState s);
	319	BlockStats bdrv_query_stats(const BlockDriverState bs);
	320	int bdrv_can_snapshot(BlockDriverState *bs);
	321	int bdrv_is_snapshot(BlockDriverState *bs);
	322	BlockDriverState *bdrv_snapshots(void);
	323	int bdrv_snapshot_create(BlockDriverState *bs,
	324	QEMUSnapshotInfo *sn_info);
	325	int bdrv_snapshot_goto(BlockDriverState *bs,
	326	const char *snapshot_id);
	327	int bdrv_snapshot_delete(BlockDriverState bs, const char snapshot_id);
	328	int bdrv_snapshot_list(BlockDriverState *bs,
	329	QEMUSnapshotInfo **psn_info);
	330	int bdrv_snapshot_load_tmp(BlockDriverState *bs,
	331	const char *snapshot_name);
	332	char bdrv_snapshot_dump(char buf, int buf_size, QEMUSnapshotInfo *sn);
	333
	334	char get_human_readable_size(char buf, int buf_size, int64_t size);
	335	int path_is_absolute(const char *path);
	336	void path_combine(char *dest, int dest_size,
	337	const char *base_path,
	338	const char *filename);
	339
	340	int bdrv_save_vmstate(BlockDriverState bs, const uint8_t buf,
	341	int64_t pos, int size);
	342
	343	int bdrv_load_vmstate(BlockDriverState bs, uint8_t buf,
	344	int64_t pos, int size);
	345
	346	int bdrv_img_create(const char filename, const char fmt,
	347	const char base_filename, const char base_fmt,
	348	char *options, uint64_t img_size, int flags);
	349
	350	void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
	351	void qemu_blockalign(BlockDriverState bs, size_t size);
	352
	353	#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
	354
	355	void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
	356	int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
	357	void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
	358	void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
	359	int64_t bdrv_get_next_dirty(BlockDriverState *bs, int64_t sector);
	360	int64_t bdrv_get_dirty_count(BlockDriverState *bs);
	361
	362	void bdrv_enable_copy_on_read(BlockDriverState *bs);
	363	void bdrv_disable_copy_on_read(BlockDriverState *bs);
	364
	365	void bdrv_set_in_use(BlockDriverState *bs, int in_use);
	366	int bdrv_in_use(BlockDriverState *bs);
	367
	368	enum BlockAcctType {
	369	BDRV_ACCT_READ,
	370	BDRV_ACCT_WRITE,
	371	BDRV_ACCT_FLUSH,
	372	BDRV_MAX_IOTYPE,
	373	};
	374
	375	typedef struct BlockAcctCookie {
	376	int64_t bytes;
	377	int64_t start_time_ns;
	378	enum BlockAcctType type;
	379	} BlockAcctCookie;
	380
	381	void bdrv_acct_start(BlockDriverState bs, BlockAcctCookie cookie,
	382	int64_t bytes, enum BlockAcctType type);
	383	void bdrv_acct_done(BlockDriverState bs, BlockAcctCookie cookie);
	384
	385	typedef enum {
	386	BLKDBG_L1_UPDATE,
	387
	388	BLKDBG_L1_GROW_ALLOC_TABLE,
	389	BLKDBG_L1_GROW_WRITE_TABLE,
	390	BLKDBG_L1_GROW_ACTIVATE_TABLE,
	391
	392	BLKDBG_L2_LOAD,
	393	BLKDBG_L2_UPDATE,
	394	BLKDBG_L2_UPDATE_COMPRESSED,
	395	BLKDBG_L2_ALLOC_COW_READ,
	396	BLKDBG_L2_ALLOC_WRITE,
	397
	398	BLKDBG_READ_AIO,
	399	BLKDBG_READ_BACKING_AIO,
	400	BLKDBG_READ_COMPRESSED,
	401
	402	BLKDBG_WRITE_AIO,
	403	BLKDBG_WRITE_COMPRESSED,
	404
	405	BLKDBG_VMSTATE_LOAD,
	406	BLKDBG_VMSTATE_SAVE,
	407
	408	BLKDBG_COW_READ,
	409	BLKDBG_COW_WRITE,
	410
	411	BLKDBG_REFTABLE_LOAD,
	412	BLKDBG_REFTABLE_GROW,
	413
	414	BLKDBG_REFBLOCK_LOAD,
	415	BLKDBG_REFBLOCK_UPDATE,
	416	BLKDBG_REFBLOCK_UPDATE_PART,
	417	BLKDBG_REFBLOCK_ALLOC,
	418	BLKDBG_REFBLOCK_ALLOC_HOOKUP,
	419	BLKDBG_REFBLOCK_ALLOC_WRITE,
	420	BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
	421	BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
	422	BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
	423
	424	BLKDBG_CLUSTER_ALLOC,
	425	BLKDBG_CLUSTER_ALLOC_BYTES,
	426	BLKDBG_CLUSTER_FREE,
	427
	428	BLKDBG_EVENT_MAX,
	429	} BlkDebugEvent;
	430
	431	#define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
	432	void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
	433
	434	#endif