/*
 * QEMU System Emulator block driver
 *
 * Copyright (c) 2003 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#ifndef BLOCK_INT_H
#define BLOCK_INT_H

#include "block.h"
#include "qemu-option.h"
#include "qemu-queue.h"
#include "qemu-coroutine.h"
#include "qemu-timer.h"
#include "hbitmap.h"

#define BLOCK_FLAG_ENCRYPT	1
#define BLOCK_FLAG_COMPAT6	4

#define BLOCK_IO_LIMIT_READ     0
#define BLOCK_IO_LIMIT_WRITE    1
#define BLOCK_IO_LIMIT_TOTAL    2

#define BLOCK_IO_SLICE_TIME     100000000
#define NANOSECONDS_PER_SECOND  1000000000.0

#define BLOCK_OPT_SIZE          "size"
#define BLOCK_OPT_ENCRYPT       "encryption"
#define BLOCK_OPT_COMPAT6       "compat6"
#define BLOCK_OPT_BACKING_FILE  "backing_file"
#define BLOCK_OPT_BACKING_FMT   "backing_fmt"
#define BLOCK_OPT_CLUSTER_SIZE  "cluster_size"
#define BLOCK_OPT_TABLE_SIZE    "table_size"
#define BLOCK_OPT_PREALLOC      "preallocation"
#define BLOCK_OPT_SUBFMT        "subformat"
#define BLOCK_OPT_ADAPTER_TYPE  "adapter_type"

typedef struct BdrvTrackedRequest BdrvTrackedRequest;

typedef struct AIOPool {
    void (*cancel)(BlockDriverAIOCB *acb);
    int aiocb_size;
    BlockDriverAIOCB *free_aiocb;
} AIOPool;

typedef void BlockJobCancelFunc(void *opaque);
typedef struct BlockJob BlockJob;
typedef struct BlockJobType {
    /** Derived BlockJob struct size */
    size_t instance_size;

    /** String describing the operation, part of query-block-jobs QMP API */
    const char *job_type;

    /** Optional callback for job types that support setting a speed limit */
    int (*set_speed)(BlockJob *job, int64_t speed);
} BlockJobType;

/**
 * Long-running operation on a BlockDriverState
 */
struct BlockJob {
    const BlockJobType *job_type;
    BlockDriverState *bs;

    /**
     * The coroutine that executes the job.  If not NULL, it is
     * reentered when busy is false and the job is cancelled.
     */
    Coroutine *co;

    /**
     * Set to true if the job should cancel itself.  The flag must
     * always be tested just before toggling the busy flag from false
     * to true.  After a job has been cancelled, it should only yield
     * if #qemu_aio_wait will ("sooner or later") reenter the coroutine;
     * hence always check for cancellation before doing anything else
     * that can yield, such as sleeping on a timer.
     */
    bool cancelled;

    /**
     * Set to false by the job while it is in a quiescent state, where
     * no I/O is pending and the job has yielded on any condition
     * that is not detected by #qemu_aio_wait, such as a timer.
     */
    bool busy;

    /* These fields are published by the query-block-jobs QMP API */
    int64_t offset;
    int64_t len;
    int64_t speed;

    BlockDriverCompletionFunc *cb;
    void *opaque;
};
typedef struct BlockIOLimit {
    int64_t bps[3];
    int64_t iops[3];
} BlockIOLimit;

typedef struct BlockIOBaseValue {
    uint64_t bytes[2];
    uint64_t ios[2];
} BlockIOBaseValue;

struct BlockDriver {
    const char *format_name;
    int instance_size;
    int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
    int (*bdrv_probe_device)(const char *filename);

    /* For handling image reopen for split or non-split files */
    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);

    int (*bdrv_open)(BlockDriverState *bs, int flags);
    int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags);
    int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
                     uint8_t *buf, int nb_sectors);
    int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
                      const uint8_t *buf, int nb_sectors);
    void (*bdrv_close)(BlockDriverState *bs);
    int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
    int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
    int (*bdrv_make_empty)(BlockDriverState *bs);
    /* aio */
    BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
        BlockDriverCompletionFunc *cb, void *opaque);
    BlockDriverAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors,
        BlockDriverCompletionFunc *cb, void *opaque);

    int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
    int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
    int coroutine_fn (*bdrv_co_flush)(BlockDriverState *bs);
    /*
     * Efficiently zero a region of the disk image.  Typically an image format
     * would use a compact metadata representation to implement this.  This
     * function pointer may be NULL and .bdrv_co_writev() will be called
     * instead.
     */
    int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors);
    int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors);
    int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
        int64_t sector_num, int nb_sectors, int *pnum);

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


    const char *protocol_name;
    int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
    int64_t (*bdrv_getlength)(BlockDriverState *bs);
    int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs);
    int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
                                 const uint8_t *buf, int nb_sectors);

    int (*bdrv_snapshot_create)(BlockDriverState *bs,
                                QEMUSnapshotInfo *sn_info);
    int (*bdrv_snapshot_goto)(BlockDriverState *bs,
                              const char *snapshot_id);
    int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
    int (*bdrv_snapshot_list)(BlockDriverState *bs,
                              QEMUSnapshotInfo **psn_info);
    int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);

    int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf,
                             int64_t pos, int size);
    int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
                             int64_t pos, int size);

    int (*bdrv_change_backing_file)(BlockDriverState *bs,
        const char *backing_file, const char *backing_fmt);

    /* removable device specific */
    int (*bdrv_is_inserted)(BlockDriverState *bs);
    int (*bdrv_media_changed)(BlockDriverState *bs);
    void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag);
    void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked);

    /* to control generic scsi devices */
    int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
    BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
        unsigned long int req, void *buf,
        BlockDriverCompletionFunc *cb, void *opaque);

    /* List of options for creating images, terminated by name == NULL */
    QEMUOptionParameter *create_options;


    /*
     * Returns 0 for completed check, -errno for internal errors.
     * The check results are stored in result.
     */
    int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result,
        BdrvCheckMode fix);

    void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);

    /*
     * Returns 1 if newly created images are guaranteed to contain only
     * zeros, 0 otherwise.
     */
    int (*bdrv_has_zero_init)(BlockDriverState *bs);

    QLIST_ENTRY(BlockDriver) list;
};

/*
 * Note: the function bdrv_append() copies and swaps contents of
 * BlockDriverStates, so if you add new fields to this struct, please
 * inspect bdrv_append() to determine if the new fields need to be
 * copied as well.
 */
struct BlockDriverState {
    int64_t total_sectors; /* if we are reading a disk image, give its
                              size in sectors */
    int read_only; /* if true, the media is read only */
    int open_flags; /* flags used to open the file, re-used for re-open */
    int encrypted; /* if true, the media is encrypted */
    int valid_key; /* if true, a valid encryption key has been set */
    int sg;        /* if true, the device is a /dev/sg* */
    int copy_on_read; /* if true, copy read backing sectors into image
                         note this is a reference count */

    BlockDriver *drv; /* NULL means no media */
    void *opaque;

    void *dev;                  /* attached device model, if any */
    /* TODO change to DeviceState when all users are qdevified */
    const BlockDevOps *dev_ops;
    void *dev_opaque;

    char filename[1024];
    char backing_file[1024]; /* if non zero, the image is a diff of
                                this file image */
    char backing_format[16]; /* if non-zero and backing_file exists */
    int is_temporary;

    BlockDriverState *backing_hd;
    BlockDriverState *file;

    /* number of in-flight copy-on-read requests */
    unsigned int copy_on_read_in_flight;

    /* async read/write emulation */

    void *sync_aiocb;

    /* the time for latest disk I/O */
    int64_t slice_start;
    int64_t slice_end;
    BlockIOLimit io_limits;
    BlockIOBaseValue slice_submitted;
    CoQueue      throttled_reqs;
    QEMUTimer    *block_timer;
    bool         io_limits_enabled;

    /* I/O stats (display with "info blockstats"). */
    uint64_t nr_bytes[BDRV_MAX_IOTYPE];
    uint64_t nr_ops[BDRV_MAX_IOTYPE];
    uint64_t total_time_ns[BDRV_MAX_IOTYPE];
    uint64_t wr_highest_sector;

    /* Whether the disk can expand beyond total_sectors */
    int growable;

    /* the memory alignment required for the buffers handled by this driver */
    int buffer_alignment;

    /* do we need to tell the quest if we have a volatile write cache? */
    int enable_write_cache;

    /* NOTE: the following infos are only hints for real hardware
       drivers. They are not used by the block driver */
    int cyls, heads, secs, translation;
    int type;
    BlockErrorAction on_read_error, on_write_error;
    BlockIOStatus iostatus;
    char device_name[32];
    HBitmap *dirty_bitmap;
    int in_use; /* users other than guest access, eg. block migration */
    QTAILQ_ENTRY(BlockDriverState) list;
    void *private;

    QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;

    /* long-running background operation */
    BlockJob *job;

};

struct BlockDriverAIOCB {
    AIOPool *pool;
    BlockDriverState *bs;
    BlockDriverCompletionFunc *cb;
    void *opaque;
    BlockDriverAIOCB *next;
};

int get_tmp_filename(char *filename, int size);

void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
                   BlockDriverCompletionFunc *cb, void *opaque);
void qemu_aio_release(void *p);

void *qemu_blockalign(BlockDriverState *bs, size_t size);
void bdrv_set_io_limits(BlockDriverState *bs,
                        BlockIOLimit *io_limits);

#ifdef _WIN32
int is_windows_drive(const char *filename);
#endif

void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs,
                       int64_t speed, BlockDriverCompletionFunc *cb,
                       void *opaque);
void block_job_complete(BlockJob *job, int ret);
int block_job_set_speed(BlockJob *job, int64_t speed);
void block_job_cancel(BlockJob *job);
bool block_job_is_cancelled(BlockJob *job);
int block_job_cancel_sync(BlockJob *job);
void block_job_sleep(BlockJob *job, QEMUClock *clock, int64_t ms);

int stream_start(BlockDriverState *bs, BlockDriverState *base,
                 const char *base_id, int64_t speed,
                 BlockDriverCompletionFunc *cb, void *opaque);

int mirror_start(BlockDriverState *bs,
                 const char *target, BlockDriver *drv, int flags,
                 int64_t speed, BlockDriverCompletionFunc *cb,
                 void *opaque, bool full);
void mirror_abort(BlockDriverState *bs);
void mirror_commit(BlockDriverState *bs);

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)

/**
 * commit_start:
 * @bs: Top Block device
 * @base: Block device that will be written into, and become the new top
 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
 * @on_error: The action to take upon error.
 * @cb: Completion function for the job.
 * @opaque: Opaque pointer value passed to @cb.
 * @errp: Error object.
 *
 */
void commit_start(BlockDriverState *bs, BlockDriverState *base,
                 BlockDriverState *top, int64_t speed,
                 BlockErrorAction on_error, BlockDriverCompletionFunc *cb,
                 void *opaque, Error **errp);

#endif /* BLOCK_INT_H */
