#include <mini-os/wait.h>
#include <xen/io/blkif.h>
#include <mini-os/types.h>
struct blkfront_dev;
struct blkfront_aiocb
{
    struct blkfront_dev *aio_dev;
    uint8_t *aio_buf;
    size_t aio_nbytes;
    off_t aio_offset;
    size_t total_bytes;
    uint8_t is_write;
    void *data;

    grant_ref_t gref[BLKIF_MAX_SEGMENTS_PER_REQUEST];
    int n;

    void (*aio_cb)(struct blkfront_aiocb *aiocb, int ret);
};
struct blkfront_info
{
    uint64_t sectors;
    unsigned sector_size;
    int mode;
    int info;
    int barrier;
    int flush;
};
struct blkfront_dev *init_blkfront(char *nodename, struct blkfront_info *info);
#ifdef HAVE_LIBC
#include <sys/stat.h>
/* POSIX IO functions:
 * use blkfront_open() to get a file descriptor to the block device
 * Don't use the other blkfront posix functions here directly, instead use
 * read(), write(), lseek() and fstat() on the file descriptor
 */
int blkfront_open(struct blkfront_dev *dev);
int blkfront_posix_rwop(int fd, uint8_t* buf, size_t count, int write);
#define blkfront_posix_write(fd, buf, count) blkfront_posix_rwop(fd, (uint8_t*)buf, count, 1)
#define blkfront_posix_read(fd, buf, count) blkfront_posix_rwop(fd, (uint8_t*)buf, count, 0)
int blkfront_posix_fstat(int fd, struct stat* buf);
#endif
void blkfront_aio(struct blkfront_aiocb *aiocbp, int write);
#define blkfront_aio_read(aiocbp) blkfront_aio(aiocbp, 0)
#define blkfront_aio_write(aiocbp) blkfront_aio(aiocbp, 1)
void blkfront_io(struct blkfront_aiocb *aiocbp, int write);
#define blkfront_read(aiocbp) blkfront_io(aiocbp, 0)
#define blkfront_write(aiocbp) blkfront_io(aiocbp, 1)
void blkfront_aio_push_operation(struct blkfront_aiocb *aiocbp, uint8_t op);
int blkfront_aio_poll(struct blkfront_dev *dev);
void blkfront_sync(struct blkfront_dev *dev);
void shutdown_blkfront(struct blkfront_dev *dev);

extern struct wait_queue_head blkfront_queue;