blkdev.h

Go to the documentation of this file.

/*
 * No copyright is claimed.  This code is in the public domain; do with
 * it what you wish.
 *
 * Written by Karel Zak <kzak@redhat.com>
 */
#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 ioctls, 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
 
/* uniform CD-ROM information */
# ifndef CDROM_GET_CAPABILITY
#  define CDROM_GET_CAPABILITY 0x5331
# endif
 
#endif /* __linux */
 
 
#ifdef APPLE_DARWIN
# define BLKGETSIZE DKIOCGETBLOCKCOUNT32
#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 /* HDIO_GETGEO */
 
 
/* 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);
 
/* get partition devices start offset */
int blkdev_get_start(int fd, dev_t rdev, unsigned long long *s);
 
/* SCSI device types.  Copied almost as-is from kernel header.
 * http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/scsi/scsi.h */
#define SCSI_TYPE_DISK          0x00
#define SCSI_TYPE_TAPE          0x01
#define SCSI_TYPE_PRINTER       0x02
#define SCSI_TYPE_PROCESSOR     0x03    /* HP scanners use this */
#define SCSI_TYPE_WORM          0x04    /* Treated as ROM by our system */
#define SCSI_TYPE_ROM           0x05
#define SCSI_TYPE_SCANNER       0x06
#define SCSI_TYPE_MOD           0x07    /* Magneto-optical disk - treated as SCSI_TYPE_DISK */
#define SCSI_TYPE_MEDIUM_CHANGER    0x08
#define SCSI_TYPE_COMM          0x09    /* Communications device */
#define SCSI_TYPE_RAID          0x0c
#define SCSI_TYPE_ENCLOSURE     0x0d    /* Enclosure Services Device */
#define SCSI_TYPE_RBC           0x0e
#define SCSI_TYPE_OSD           0x11
#define SCSI_TYPE_NO_LUN        0x7f
 
/* convert scsi type code to name */
const char *blkdev_scsi_type_to_name(int type);
 
 
#endif /* BLKDEV_H */