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#ifndef BLKDEV_H
#define BLKDEV_H
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#define DEFAULT_SECTOR_SIZE 512
#if !defined(BLKROSET) && defined(__linux__)
#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
#define BLKRRPART _IO(0x12,95) /* re-read partition table */
#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
/* ioctls introduced in 2.2.16, removed in 2.5.58 */
#define BLKELVGET _IOR(0x12,106,size_t) /* elevator get */
#define BLKELVSET _IOW(0x12,107,size_t) /* elevator set */
#define BLKBSZGET _IOR(0x12,112,size_t)
#define BLKBSZSET _IOW(0x12,113,size_t)
#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
#endif /* BLKROSET && __linux__ */
#ifdef APPLE_DARWIN
#define BLKGETSIZE DKIOCGETBLOCKCOUNT32
#endif
/* block device topology ioctls, introduced in 2.6.32 */
#ifndef BLKIOMIN
#define BLKIOMIN _IO(0x12,120)
#define BLKIOOPT _IO(0x12,121)
#define BLKALIGNOFF _IO(0x12,122)
#define BLKPBSZGET _IO(0x12,123)
#endif
#ifndef HDIO_GETGEO
# ifdef __linux__
# define HDIO_GETGEO 0x0301
# endif
struct hd_geometry {
unsigned char heads;
unsigned char sectors;
unsigned short cylinders; /* truncated */
unsigned long start;
};
#endif
/* Determine size in bytes */
off_t blkdev_find_size (int fd);
/* get size in bytes */
int blkdev_get_size(int fd, unsigned long long *bytes);
/* get 512-byte sector count */
int blkdev_get_sectors(int fd, unsigned long long *sectors);
/* get hardware sector size */
int blkdev_get_sector_size(int fd, int *sector_size);
#endif /* BLKDEV_H */
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