#ifndef BLKDEV_H
#define BLKDEV_H
#include <sys/types.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_IOCCOM_H
# include <sys/ioccom.h> /* for _IO macro on e.g. Solaris */
#endif
#include <fcntl.h>
#include <unistd.h>
#ifdef HAVE_SYS_MKDEV_H
# include <sys/mkdev.h> /* major and minor on Solaris */
#endif
#define DEFAULT_SECTOR_SIZE 512
#ifdef __linux__
/* very basic ioclts, should be available everywhere */
# ifndef BLKROSET
# 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)
# endif /* !BLKROSET */
# ifndef BLKGETSIZE64
# define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
# endif
/* block device topology ioctls, introduced in 2.6.32 (commit ac481c20) */
# ifndef BLKIOMIN
# define BLKIOMIN _IO(0x12,120)
# define BLKIOOPT _IO(0x12,121)
# define BLKALIGNOFF _IO(0x12,122)
# define BLKPBSZGET _IO(0x12,123)
# endif
/* discard zeroes support, introduced in 2.6.33 (commit 98262f27) */
# ifndef BLKDISCARDZEROES
# define BLKDISCARDZEROES _IO(0x12,124)
# endif
/* filesystem freeze, introduced in 2.6.29 (commit fcccf502) */
# ifndef FIFREEZE
# define FIFREEZE _IOWR('X', 119, int) /* Freeze */
# define FITHAW _IOWR('X', 120, int) /* Thaw */
# endif
#endif /* __linux */
#ifdef APPLE_DARWIN
# define BLKGETSIZE DKIOCGETBLOCKCOUNT32
#endif
#ifndef HDIO_GETGEO
# ifdef __linux__
# define HDIO_GETGEO 0x0301
# endif
/* uniform CD-ROM information */
#ifndef CDROM_GET_CAPABILITY
# define CDROM_GET_CAPABILITY 0x5331
#endif
struct hd_geometry {
unsigned char heads;
unsigned char sectors;
unsigned short cylinders; /* truncated */
unsigned long start;
};
#endif
/* are we working with block device? */
int is_blkdev(int fd);
/* 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);
/* specifies whether or not the device is misaligned */
int blkdev_is_misaligned(int fd);
/* get physical block device size */
int blkdev_get_physector_size(int fd, int *sector_size);
/* is the device cdrom capable? */
int blkdev_is_cdrom(int fd);
/* get device's geometry - legacy */
int blkdev_get_geometry(int fd, unsigned int *h, unsigned int *s);
#endif /* BLKDEV_H */
