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 */
32struct 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 */
48struct 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
59extern char * partition_name(kdev_t dev);
60extern int blk_ioctl(kdev_t dev, unsigned int cmd, unsigned long arg);
61
62#endif /* __KERNEL__ */
63
64#endif /* _LINUX_BLKPG_H */
65