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      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 
     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 *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 */
     59