#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
  #define BLKPG_RESIZE_PARTITION	3
  
  /* 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 */