include/linux/blkpg.h

   1 #ifndef _LINUX_BLKPG_H
   2 #define _LINUX_BLKPG_H
   3
   4 /*
   5  * Partition table and disk geometry handling
   6  *
   7  * A single ioctl with lots of subfunctions:
   8  *
   9  * Device number stuff:
  10  *    get_whole_disk()          (given the device number of a partition,
  11  *                               find the device number of the encompassing disk)
  12  *    get_all_partitions()      (given the device number of a disk, return the
  13  *                               device numbers of all its known partitions)
  14  *
  15  * Partition stuff:
  16  *    add_partition()
  17  *    delete_partition()
  18  *    test_partition_in_use()   (also for test_disk_in_use)
  19  *
  20  * Geometry stuff:
  21  *    get_geometry()
  22  *    set_geometry()
  23  *    get_bios_drivedata()
  24  *
  25  * For today, only the partition stuff - aeb, 990515
  26  */
  27 #include <linux/compiler.h>
  28 #include <linux/ioctl.h>
  29
  30 #define BLKPG      _IO(0x12,105)
  31
  32 /* The argument structure */
  33 struct blkpg_ioctl_arg {
  34         int op;
  35         int flags;
  36         int datalen;
  37         void __user *data;
  38 };
  39
  40 /* The subfunctions (for the op field) */
  41 #define BLKPG_ADD_PARTITION     1
  42 #define BLKPG_DEL_PARTITION     2
  43
  44 /* Sizes of name fields. Unused at present. */
  45 #define BLKPG_DEVNAMELTH        64
  46 #define BLKPG_VOLNAMELTH        64
  47
  48 /* The data structure for ADD_PARTITION and DEL_PARTITION */
  49 struct blkpg_partition {
  50         long long start;                /* starting offset in bytes */
  51         long long length;               /* length in bytes */
  52         int pno;                        /* partition number */
  53         char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
  54                                            to be used in kernel messages */
  55         char volname[BLKPG_VOLNAMELTH]; /* volume label */
  56 };
  57
  58 #endif /* _LINUX_BLKPG_H */