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 */
65