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/ioctl.h>
  28
  29 #define BLKPG      _IO(0x12,105)
  30
  31 /* The argument structure */
  32 struct blkpg_ioctl_arg {
  33         int op;
  34         int flags;
  35         int datalen;
  36         void *data;
  37 };
  38
  39 /* The subfunctions (for the op field) */
  40 #define BLKPG_ADD_PARTITION     1
  41 #define BLKPG_DEL_PARTITION     2
  42
  43 /* Sizes of name fields. Unused at present. */
  44 #define BLKPG_DEVNAMELTH        64
  45 #define BLKPG_VOLNAMELTH        64
  46
  47 /* The data structure for ADD_PARTITION and DEL_PARTITION */
  48 struct blkpg_partition {
  49         long long start;                /* starting offset in bytes */
  50         long long length;               /* length in bytes */
  51         int pno;                        /* partition number */
  52         char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
  53                                            to be used in kernel messages */
  54         char volname[BLKPG_VOLNAMELTH]; /* volume label */
  55 };
  56
  57 #ifdef __KERNEL__
  58
  59 extern char * partition_name(kdev_t dev);
  60 extern int blk_ioctl(kdev_t dev, unsigned int cmd, unsigned long arg);
  61
  62 #endif /* __KERNEL__ */
  63
  64 #endif /* _LINUX_BLKPG_H */