root/include/linux/blkpg.h

INCLUDED FROM

#ifndef _LINUX_BLKPG_H
#define _LINUX_BLKPG_H

/*
 * Partition table and disk geometry handling
 *
 * A single ioctl with lots of subfunctions:
 *
 * Device number stuff:
 *    get_whole_disk()          (given the device number of a partition,
 *                               find the device number of the encompassing disk)
 *    get_all_partitions()      (given the device number of a disk, return the
 *                               device numbers of all its known partitions)
 *
 * Partition stuff:
 *    add_partition()
 *    delete_partition()
 *    test_partition_in_use()   (also for test_disk_in_use)
 *
 * Geometry stuff:
 *    get_geometry()
 *    set_geometry()
 *    get_bios_drivedata()
 *
 * For today, only the partition stuff - aeb, 990515
 */
#include <linux/compiler.h>
#include <linux/ioctl.h>

#define BLKPG      _IO(0x12,105)

/* The argument structure */
struct blkpg_ioctl_arg {
        int op;
        int flags;
        int datalen;
        void __user *data;
};

/* The subfunctions (for the op field) */
#define BLKPG_ADD_PARTITION     1
#define BLKPG_DEL_PARTITION     2

/* Sizes of name fields. Unused at present. */
#define BLKPG_DEVNAMELTH        64
#define BLKPG_VOLNAMELTH        64

/* The data structure for ADD_PARTITION and DEL_PARTITION */
struct blkpg_partition {
        long long start;                /* starting offset in bytes */
        long long length;               /* length in bytes */
        int pno;                        /* partition number */
        char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
                                           to be used in kernel messages */
        char volname[BLKPG_VOLNAMELTH]; /* volume label */
};

#endif /* _LINUX_BLKPG_H */