[deliverable/linux.git] / include / linux / genhd.h

#ifndef _LINUX_GENHD_H
#define _LINUX_GENHD_H

/*
 * 	genhd.h Copyright (C) 1992 Drew Eckhardt
 *	Generic hard disk header file by  
 * 		Drew Eckhardt
 *
 *		<drew@colorado.edu>
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/fs.h>

enum {
/* These three have identical behaviour; use the second one if DOS FDISK gets
   confused about extended/logical partitions starting past cylinder 1023. */
	DOS_EXTENDED_PARTITION = 5,
	LINUX_EXTENDED_PARTITION = 0x85,
	WIN98_EXTENDED_PARTITION = 0x0f,

	LINUX_SWAP_PARTITION = 0x82,
	LINUX_RAID_PARTITION = 0xfd,	/* autodetect RAID partition */

	SOLARIS_X86_PARTITION =	LINUX_SWAP_PARTITION,
	NEW_SOLARIS_X86_PARTITION = 0xbf,

	DM6_AUX1PARTITION = 0x51,	/* no DDO:  use xlated geom */
	DM6_AUX3PARTITION = 0x53,	/* no DDO:  use xlated geom */
	DM6_PARTITION =	0x54,		/* has DDO: use xlated geom & offset */
	EZD_PARTITION =	0x55,		/* EZ-DRIVE */

	FREEBSD_PARTITION = 0xa5,	/* FreeBSD Partition ID */
	OPENBSD_PARTITION = 0xa6,	/* OpenBSD Partition ID */
	NETBSD_PARTITION = 0xa9,	/* NetBSD Partition ID */
	BSDI_PARTITION = 0xb7,		/* BSDI Partition ID */
	MINIX_PARTITION = 0x81,		/* Minix Partition ID */
	UNIXWARE_PARTITION = 0x63,	/* Same as GNU_HURD and SCO Unix */
};

#ifndef __KERNEL__

struct partition {
	unsigned char boot_ind;		/* 0x80 - active */
	unsigned char head;		/* starting head */
	unsigned char sector;		/* starting sector */
	unsigned char cyl;		/* starting cylinder */
	unsigned char sys_ind;		/* What partition type */
	unsigned char end_head;		/* end head */
	unsigned char end_sector;	/* end sector */
	unsigned char end_cyl;		/* end cylinder */
	unsigned int start_sect;	/* starting sector counting from 0 */
	unsigned int nr_sects;		/* nr of sectors in partition */
} __attribute__((packed));

#endif

#ifdef __KERNEL__
struct partition {
	unsigned char boot_ind;		/* 0x80 - active */
	unsigned char head;		/* starting head */
	unsigned char sector;		/* starting sector */
	unsigned char cyl;		/* starting cylinder */
	unsigned char sys_ind;		/* What partition type */
	unsigned char end_head;		/* end head */
	unsigned char end_sector;	/* end sector */
	unsigned char end_cyl;		/* end cylinder */
	__le32 start_sect;	/* starting sector counting from 0 */
	__le32 nr_sects;		/* nr of sectors in partition */
} __attribute__((packed));

struct hd_struct {
	sector_t start_sect;
	sector_t nr_sects;
	struct kobject kobj;
	unsigned ios[2], sectors[2];	/* READs and WRITEs */
	int policy, partno;
};

#define GENHD_FL_REMOVABLE			1
#define GENHD_FL_DRIVERFS			2
#define GENHD_FL_CD				8
#define GENHD_FL_UP				16
#define GENHD_FL_SUPPRESS_PARTITION_INFO	32

struct disk_stats {
	unsigned sectors[2];		/* READs and WRITEs */
	unsigned ios[2];
	unsigned merges[2];
	unsigned ticks[2];
	unsigned io_ticks;
	unsigned time_in_queue;
};
	
struct gendisk {
	int major;			/* major number of driver */
	int first_minor;
	int minors;                     /* maximum number of minors, =1 for
                                         * disks that can't be partitioned. */
	char disk_name[32];		/* name of major driver */
	struct hd_struct **part;	/* [indexed by minor] */
	struct block_device_operations *fops;
	struct request_queue *queue;
	void *private_data;
	sector_t capacity;

	int flags;
	char devfs_name[64];		/* devfs crap */
	int number;			/* more of the same */
	struct device *driverfs_dev;
	struct kobject kobj;

	struct timer_rand_state *random;
	int policy;

	atomic_t sync_io;		/* RAID */
	unsigned long stamp;
	int in_flight;
#ifdef	CONFIG_SMP
	struct disk_stats *dkstats;
#else
	struct disk_stats dkstats;
#endif
};

/* Structure for sysfs attributes on block devices */
struct disk_attribute {
	struct attribute attr;
	ssize_t (*show)(struct gendisk *, char *);
	ssize_t (*store)(struct gendisk *, const char *, size_t);
};

/* 
 * Macros to operate on percpu disk statistics:
 *
 * The __ variants should only be called in critical sections. The full
 * variants disable/enable preemption.
 */
#ifdef	CONFIG_SMP
#define __disk_stat_add(gendiskp, field, addnd) 	\
	(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)

#define disk_stat_read(gendiskp, field)					\
({									\
	typeof(gendiskp->dkstats->field) res = 0;			\
	int i;								\
	for (i=0; i < NR_CPUS; i++) {					\
		if (!cpu_possible(i))					\
			continue;					\
		res += per_cpu_ptr(gendiskp->dkstats, i)->field;	\
	}								\
	res;								\
})

static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)	{
	int i;
	for (i=0; i < NR_CPUS; i++) {
		if (cpu_possible(i)) {
			memset(per_cpu_ptr(gendiskp->dkstats, i), value,	
					sizeof (struct disk_stats));
		}
	}
}		
				
#else
#define __disk_stat_add(gendiskp, field, addnd) \
				(gendiskp->dkstats.field += addnd)
#define disk_stat_read(gendiskp, field)	(gendiskp->dkstats.field)

static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)	{
	memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
}
#endif

#define disk_stat_add(gendiskp, field, addnd)			\
	do {							\
		preempt_disable();				\
		__disk_stat_add(gendiskp, field, addnd);	\
		preempt_enable();				\
	} while (0)

#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)

#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)

#define __disk_stat_sub(gendiskp, field, subnd) \
		__disk_stat_add(gendiskp, field, -subnd)
#define disk_stat_sub(gendiskp, field, subnd) \
		disk_stat_add(gendiskp, field, -subnd)


/* Inlines to alloc and free disk stats in struct gendisk */
#ifdef  CONFIG_SMP
static inline int init_disk_stats(struct gendisk *disk)
{
	disk->dkstats = alloc_percpu(struct disk_stats);
	if (!disk->dkstats)
		return 0;
	return 1;
}

static inline void free_disk_stats(struct gendisk *disk)
{
	free_percpu(disk->dkstats);
}
#else	/* CONFIG_SMP */
static inline int init_disk_stats(struct gendisk *disk)
{
	return 1;
}

static inline void free_disk_stats(struct gendisk *disk)
{
}
#endif	/* CONFIG_SMP */

/* drivers/block/ll_rw_blk.c */
extern void disk_round_stats(struct gendisk *disk);

/* drivers/block/genhd.c */
extern int get_blkdev_list(char *, int);
extern void add_disk(struct gendisk *disk);
extern void del_gendisk(struct gendisk *gp);
extern void unlink_gendisk(struct gendisk *gp);
extern struct gendisk *get_gendisk(dev_t dev, int *part);

extern void set_device_ro(struct block_device *bdev, int flag);
extern void set_disk_ro(struct gendisk *disk, int flag);

/* drivers/char/random.c */
extern void add_disk_randomness(struct gendisk *disk);
extern void rand_initialize_disk(struct gendisk *disk);

static inline sector_t get_start_sect(struct block_device *bdev)
{
	return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
}
static inline sector_t get_capacity(struct gendisk *disk)
{
	return disk->capacity;
}
static inline void set_capacity(struct gendisk *disk, sector_t size)
{
	disk->capacity = size;
}

#endif  /*  __KERNEL__  */

#ifdef CONFIG_SOLARIS_X86_PARTITION

#define SOLARIS_X86_NUMSLICE	8
#define SOLARIS_X86_VTOC_SANE	(0x600DDEEEUL)

struct solaris_x86_slice {
	__le16 s_tag;		/* ID tag of partition */
	__le16 s_flag;		/* permission flags */
	__le32 s_start;		/* start sector no of partition */
	__le32 s_size;		/* # of blocks in partition */
};

struct solaris_x86_vtoc {
	unsigned int v_bootinfo[3];	/* info needed by mboot (unsupported) */
	__le32 v_sanity;		/* to verify vtoc sanity */
	__le32 v_version;		/* layout version */
	char	v_volume[8];		/* volume name */
	__le16	v_sectorsz;		/* sector size in bytes */
	__le16	v_nparts;		/* number of partitions */
	unsigned int v_reserved[10];	/* free space */
	struct solaris_x86_slice
		v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	char	v_asciilabel[128];	/* for compatibility */
};

#endif /* CONFIG_SOLARIS_X86_PARTITION */

#ifdef CONFIG_BSD_DISKLABEL
/*
 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 * updated by Marc Espie <Marc.Espie@openbsd.org>
 */

/* check against BSD src/sys/sys/disklabel.h for consistency */

#define BSD_DISKMAGIC	(0x82564557UL)	/* The disk magic number */
#define BSD_MAXPARTITIONS	16
#define OPENBSD_MAXPARTITIONS	16
#define BSD_FS_UNUSED		0	/* disklabel unused partition entry ID */
struct bsd_disklabel {
	__le32	d_magic;		/* the magic number */
	__s16	d_type;			/* drive type */
	__s16	d_subtype;		/* controller/d_type specific */
	char	d_typename[16];		/* type name, e.g. "eagle" */
	char	d_packname[16];			/* pack identifier */ 
	__u32	d_secsize;		/* # of bytes per sector */
	__u32	d_nsectors;		/* # of data sectors per track */
	__u32	d_ntracks;		/* # of tracks per cylinder */
	__u32	d_ncylinders;		/* # of data cylinders per unit */
	__u32	d_secpercyl;		/* # of data sectors per cylinder */
	__u32	d_secperunit;		/* # of data sectors per unit */
	__u16	d_sparespertrack;	/* # of spare sectors per track */
	__u16	d_sparespercyl;		/* # of spare sectors per cylinder */
	__u32	d_acylinders;		/* # of alt. cylinders per unit */
	__u16	d_rpm;			/* rotational speed */
	__u16	d_interleave;		/* hardware sector interleave */
	__u16	d_trackskew;		/* sector 0 skew, per track */
	__u16	d_cylskew;		/* sector 0 skew, per cylinder */
	__u32	d_headswitch;		/* head switch time, usec */
	__u32	d_trkseek;		/* track-to-track seek, usec */
	__u32	d_flags;		/* generic flags */
#define NDDATA 5
	__u32	d_drivedata[NDDATA];	/* drive-type specific information */
#define NSPARE 5
	__u32	d_spare[NSPARE];	/* reserved for future use */
	__le32	d_magic2;		/* the magic number (again) */
	__le16	d_checksum;		/* xor of data incl. partitions */

			/* filesystem and partition information: */
	__le16	d_npartitions;		/* number of partitions in following */
	__le32	d_bbsize;		/* size of boot area at sn0, bytes */
	__le32	d_sbsize;		/* max size of fs superblock, bytes */
	struct	bsd_partition {		/* the partition table */
		__le32	p_size;		/* number of sectors in partition */
		__le32	p_offset;	/* starting sector */
		__le32	p_fsize;	/* filesystem basic fragment size */
		__u8	p_fstype;	/* filesystem type, see below */
		__u8	p_frag;		/* filesystem fragments per block */
		__le16	p_cpg;		/* filesystem cylinders per group */
	} d_partitions[BSD_MAXPARTITIONS];	/* actually may be more */
};

#endif	/* CONFIG_BSD_DISKLABEL */

#ifdef CONFIG_UNIXWARE_DISKLABEL
/*
 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 */

#define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)	/* The disk magic number */
#define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)	/* The slice table magic nr */
#define UNIXWARE_NUMSLICE      16
#define UNIXWARE_FS_UNUSED     0		/* Unused slice entry ID */

struct unixware_slice {
	__le16   s_label;	/* label */
	__le16   s_flags;	/* permission flags */
	__le32   start_sect;	/* starting sector */
	__le32   nr_sects;	/* number of sectors in slice */
};

struct unixware_disklabel {
	__le32   d_type;               	/* drive type */
	__le32   d_magic;                /* the magic number */
	__le32   d_version;              /* version number */
	char    d_serial[12];           /* serial number of the device */
	__le32   d_ncylinders;           /* # of data cylinders per device */
	__le32   d_ntracks;              /* # of tracks per cylinder */
	__le32   d_nsectors;             /* # of data sectors per track */
	__le32   d_secsize;              /* # of bytes per sector */
	__le32   d_part_start;           /* # of first sector of this partition */
	__le32   d_unknown1[12];         /* ? */
 	__le32	d_alt_tbl;              /* byte offset of alternate table */
 	__le32	d_alt_len;              /* byte length of alternate table */
 	__le32	d_phys_cyl;             /* # of physical cylinders per device */
 	__le32	d_phys_trk;             /* # of physical tracks per cylinder */
 	__le32	d_phys_sec;             /* # of physical sectors per track */
 	__le32	d_phys_bytes;           /* # of physical bytes per sector */
 	__le32	d_unknown2;             /* ? */
	__le32   d_unknown3;             /* ? */
	__le32	d_pad[8];               /* pad */

	struct unixware_vtoc {
		__le32	v_magic;		/* the magic number */
		__le32	v_version;		/* version number */
		char	v_name[8];		/* volume name */
		__le16	v_nslices;		/* # of slices */
		__le16	v_unknown1;		/* ? */
		__le32	v_reserved[10];		/* reserved */
		struct unixware_slice
			v_slice[UNIXWARE_NUMSLICE];	/* slice headers */
	} vtoc;

};  /* 408 */

#endif /* CONFIG_UNIXWARE_DISKLABEL */

#ifdef CONFIG_MINIX_SUBPARTITION
#   define MINIX_NR_SUBPARTITIONS  4
#endif /* CONFIG_MINIX_SUBPARTITION */

#ifdef __KERNEL__

char *disk_name (struct gendisk *hd, int part, char *buf);

extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
extern void add_partition(struct gendisk *, int, sector_t, sector_t);
extern void delete_partition(struct gendisk *, int);

extern struct gendisk *alloc_disk_node(int minors, int node_id);
extern struct gendisk *alloc_disk(int minors);
extern struct kobject *get_disk(struct gendisk *disk);
extern void put_disk(struct gendisk *disk);

extern void blk_register_region(dev_t dev, unsigned long range,
			struct module *module,
			struct kobject *(*probe)(dev_t, int *, void *),
			int (*lock)(dev_t, void *),
			void *data);
extern void blk_unregister_region(dev_t dev, unsigned long range);

static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
{
	return bdget(MKDEV(disk->major, disk->first_minor) + index);
}

#endif

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_GENHD_H
	2	#define _LINUX_GENHD_H
	3
	4	/*
	5	* genhd.h Copyright (C) 1992 Drew Eckhardt
	6	* Generic hard disk header file by
	7	* Drew Eckhardt
	8	*
	9	* <drew@colorado.edu>
	10	*/
	11
	12	#include <linux/config.h>
	13	#include <linux/types.h>
	14	#include <linux/major.h>
	15	#include <linux/device.h>
	16	#include <linux/smp.h>
	17	#include <linux/string.h>
	18	#include <linux/fs.h>
	19
	20	enum {
	21	/* These three have identical behaviour; use the second one if DOS FDISK gets
	22	confused about extended/logical partitions starting past cylinder 1023. */
	23	DOS_EXTENDED_PARTITION = 5,
	24	LINUX_EXTENDED_PARTITION = 0x85,
	25	WIN98_EXTENDED_PARTITION = 0x0f,
	26
	27	LINUX_SWAP_PARTITION = 0x82,
	28	LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
	29
	30	SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
	31	NEW_SOLARIS_X86_PARTITION = 0xbf,
	32
	33	DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
	34	DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
	35	DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
	36	EZD_PARTITION = 0x55, /* EZ-DRIVE */
	37
	38	FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
	39	OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
	40	NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
	41	BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
	42	MINIX_PARTITION = 0x81, /* Minix Partition ID */
	43	UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
	44	};
	45
	46	#ifndef __KERNEL__
	47
	48	struct partition {
	49	unsigned char boot_ind; /* 0x80 - active */
	50	unsigned char head; /* starting head */
	51	unsigned char sector; /* starting sector */
	52	unsigned char cyl; /* starting cylinder */
	53	unsigned char sys_ind; /* What partition type */
	54	unsigned char end_head; /* end head */
	55	unsigned char end_sector; /* end sector */
	56	unsigned char end_cyl; /* end cylinder */
	57	unsigned int start_sect; /* starting sector counting from 0 */
	58	unsigned int nr_sects; /* nr of sectors in partition */
	59	} __attribute__((packed));
	60
	61	#endif
	62
	63	#ifdef __KERNEL__
	64	struct partition {
65	unsigned char boot_ind; /* 0x80 - active */
66	unsigned char head; /* starting head */
67	unsigned char sector; /* starting sector */
68	unsigned char cyl; /* starting cylinder */
69	unsigned char sys_ind; /* What partition type */
70	unsigned char end_head; /* end head */
71	unsigned char end_sector; /* end sector */
72	unsigned char end_cyl; /* end cylinder */
73	__le32 start_sect; /* starting sector counting from 0 */
74	__le32 nr_sects; /* nr of sectors in partition */
75	} __attribute__((packed));
76
77	struct hd_struct {
78	sector_t start_sect;
79	sector_t nr_sects;
80	struct kobject kobj;
47a00410	81	unsigned ios[2], sectors[2]; /* READs and WRITEs */
1da177e4 LT	82	int policy, partno;
	83	};
	84
	85	#define GENHD_FL_REMOVABLE 1
	86	#define GENHD_FL_DRIVERFS 2
	87	#define GENHD_FL_CD 8
	88	#define GENHD_FL_UP 16
	89	#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
	90
	91	struct disk_stats {
47a00410	92	unsigned sectors[2]; /* READs and WRITEs */
a362357b JA	93	unsigned ios[2];
	94	unsigned merges[2];
	95	unsigned ticks[2];
1da177e4 LT	96	unsigned io_ticks;
	97	unsigned time_in_queue;
	98	};
	99
	100	struct gendisk {
	101	int major; /* major number of driver */
	102	int first_minor;
	103	int minors; /* maximum number of minors, =1 for
	104	* disks that can't be partitioned. */
	105	char disk_name[32]; /* name of major driver */
	106	struct hd_struct *part; / [indexed by minor] */
	107	struct block_device_operations *fops;
	108	struct request_queue *queue;
	109	void *private_data;
	110	sector_t capacity;
	111
	112	int flags;
	113	char devfs_name[64]; /* devfs crap */
	114	int number; /* more of the same */
	115	struct device *driverfs_dev;
	116	struct kobject kobj;
	117
	118	struct timer_rand_state *random;
	119	int policy;
	120
	121	atomic_t sync_io; /* RAID */
20e5c81f	122	unsigned long stamp;
1da177e4 LT	123	int in_flight;
	124	#ifdef CONFIG_SMP
	125	struct disk_stats *dkstats;
	126	#else
	127	struct disk_stats dkstats;
	128	#endif
	129	};
	130
	131	/* Structure for sysfs attributes on block devices */
	132	struct disk_attribute {
	133	struct attribute attr;
	134	ssize_t (show)(struct gendisk , char *);
a7fd6706	135	ssize_t (store)(struct gendisk , const char *, size_t);
1da177e4 LT	136	};
	137
	138	/*
	139	* Macros to operate on percpu disk statistics:
	140	*
	141	* The __ variants should only be called in critical sections. The full
	142	* variants disable/enable preemption.
	143	*/
	144	#ifdef CONFIG_SMP
	145	#define __disk_stat_add(gendiskp, field, addnd) \
	146	(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
	147
	148	#define disk_stat_read(gendiskp, field) \
	149	({ \
	150	typeof(gendiskp->dkstats->field) res = 0; \
	151	int i; \
	152	for (i=0; i < NR_CPUS; i++) { \
	153	if (!cpu_possible(i)) \
	154	continue; \
	155	res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
	156	} \
	157	res; \
	158	})
	159
	160	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	161	int i;
	162	for (i=0; i < NR_CPUS; i++) {
	163	if (cpu_possible(i)) {
	164	memset(per_cpu_ptr(gendiskp->dkstats, i), value,
	165	sizeof (struct disk_stats));
	166	}
	167	}
	168	}
	169
	170	#else
	171	#define __disk_stat_add(gendiskp, field, addnd) \
	172	(gendiskp->dkstats.field += addnd)
	173	#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
	174
	175	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	176	memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
	177	}
	178	#endif
	179
	180	#define disk_stat_add(gendiskp, field, addnd) \
	181	do { \
	182	preempt_disable(); \
	183	__disk_stat_add(gendiskp, field, addnd); \
	184	preempt_enable(); \
	185	} while (0)
	186
	187	#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
	188	#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
	189
	190	#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
	191	#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
	192
	193	#define __disk_stat_sub(gendiskp, field, subnd) \
	194	__disk_stat_add(gendiskp, field, -subnd)
	195	#define disk_stat_sub(gendiskp, field, subnd) \
	196	disk_stat_add(gendiskp, field, -subnd)
	197
	198
	199	/* Inlines to alloc and free disk stats in struct gendisk */
200	#ifdef CONFIG_SMP
201	static inline int init_disk_stats(struct gendisk *disk)
202	{
203	disk->dkstats = alloc_percpu(struct disk_stats);
204	if (!disk->dkstats)
205	return 0;
206	return 1;
207	}
208
209	static inline void free_disk_stats(struct gendisk *disk)
210	{
211	free_percpu(disk->dkstats);
212	}
213	#else /* CONFIG_SMP */
214	static inline int init_disk_stats(struct gendisk *disk)
215	{
216	return 1;
217	}
218
219	static inline void free_disk_stats(struct gendisk *disk)
220	{
221	}
222	#endif /* CONFIG_SMP */
223
224	/* drivers/block/ll_rw_blk.c */
225	extern void disk_round_stats(struct gendisk *disk);
226
227	/* drivers/block/genhd.c */
ac20427e	228	extern int get_blkdev_list(char *, int);
1da177e4 LT	229	extern void add_disk(struct gendisk *disk);
	230	extern void del_gendisk(struct gendisk *gp);
	231	extern void unlink_gendisk(struct gendisk *gp);
	232	extern struct gendisk get_gendisk(dev_t dev, int part);
	233
	234	extern void set_device_ro(struct block_device *bdev, int flag);
	235	extern void set_disk_ro(struct gendisk *disk, int flag);
	236
	237	/* drivers/char/random.c */
	238	extern void add_disk_randomness(struct gendisk *disk);
	239	extern void rand_initialize_disk(struct gendisk *disk);
	240
	241	static inline sector_t get_start_sect(struct block_device *bdev)
	242	{
	243	return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
	244	}
	245	static inline sector_t get_capacity(struct gendisk *disk)
	246	{
	247	return disk->capacity;
	248	}
	249	static inline void set_capacity(struct gendisk *disk, sector_t size)
	250	{
	251	disk->capacity = size;
	252	}
	253
	254	#endif /* __KERNEL__ */
	255
	256	#ifdef CONFIG_SOLARIS_X86_PARTITION
	257
	258	#define SOLARIS_X86_NUMSLICE 8
	259	#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
	260
	261	struct solaris_x86_slice {
	262	__le16 s_tag; /* ID tag of partition */
	263	__le16 s_flag; /* permission flags */
	264	__le32 s_start; /* start sector no of partition */
	265	__le32 s_size; /* # of blocks in partition */
	266	};
	267
	268	struct solaris_x86_vtoc {
	269	unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
	270	__le32 v_sanity; /* to verify vtoc sanity */
	271	__le32 v_version; /* layout version */
	272	char v_volume[8]; /* volume name */
	273	__le16 v_sectorsz; /* sector size in bytes */
	274	__le16 v_nparts; /* number of partitions */
	275	unsigned int v_reserved[10]; /* free space */
	276	struct solaris_x86_slice
	277	v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	278	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	279	char v_asciilabel[128]; /* for compatibility */
	280	};
	281
	282	#endif /* CONFIG_SOLARIS_X86_PARTITION */
	283
	284	#ifdef CONFIG_BSD_DISKLABEL
	285	/*
	286	* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
	287	* updated by Marc Espie <Marc.Espie@openbsd.org>
	288	*/
	289
	290	/* check against BSD src/sys/sys/disklabel.h for consistency */
	291
	292	#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
293	#define BSD_MAXPARTITIONS 16
294	#define OPENBSD_MAXPARTITIONS 16
295	#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
296	struct bsd_disklabel {
297	__le32 d_magic; /* the magic number */
298	__s16 d_type; /* drive type */
299	__s16 d_subtype; /* controller/d_type specific */
300	char d_typename[16]; /* type name, e.g. "eagle" */
301	char d_packname[16]; /* pack identifier */
302	__u32 d_secsize; /* # of bytes per sector */
303	__u32 d_nsectors; /* # of data sectors per track */
304	__u32 d_ntracks; /* # of tracks per cylinder */
305	__u32 d_ncylinders; /* # of data cylinders per unit */
306	__u32 d_secpercyl; /* # of data sectors per cylinder */
307	__u32 d_secperunit; /* # of data sectors per unit */
308	__u16 d_sparespertrack; /* # of spare sectors per track */
309	__u16 d_sparespercyl; /* # of spare sectors per cylinder */
310	__u32 d_acylinders; /* # of alt. cylinders per unit */
311	__u16 d_rpm; /* rotational speed */
312	__u16 d_interleave; /* hardware sector interleave */
313	__u16 d_trackskew; /* sector 0 skew, per track */
314	__u16 d_cylskew; /* sector 0 skew, per cylinder */
315	__u32 d_headswitch; /* head switch time, usec */
316	__u32 d_trkseek; /* track-to-track seek, usec */
317	__u32 d_flags; /* generic flags */
318	#define NDDATA 5
319	__u32 d_drivedata[NDDATA]; /* drive-type specific information */
320	#define NSPARE 5
321	__u32 d_spare[NSPARE]; /* reserved for future use */
322	__le32 d_magic2; /* the magic number (again) */
323	__le16 d_checksum; /* xor of data incl. partitions */
324
325	/* filesystem and partition information: */
326	__le16 d_npartitions; /* number of partitions in following */
327	__le32 d_bbsize; /* size of boot area at sn0, bytes */
328	__le32 d_sbsize; /* max size of fs superblock, bytes */
329	struct bsd_partition { /* the partition table */
330	__le32 p_size; /* number of sectors in partition */
331	__le32 p_offset; /* starting sector */
332	__le32 p_fsize; /* filesystem basic fragment size */
333	__u8 p_fstype; /* filesystem type, see below */
334	__u8 p_frag; /* filesystem fragments per block */
335	__le16 p_cpg; /* filesystem cylinders per group */
336	} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
337	};
338
339	#endif /* CONFIG_BSD_DISKLABEL */
340
341	#ifdef CONFIG_UNIXWARE_DISKLABEL
342	/*
343	* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
344	* and Krzysztof G. Baranowski <kgb@knm.org.pl>
345	*/
346
347	#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
348	#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
349	#define UNIXWARE_NUMSLICE 16
350	#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
351
352	struct unixware_slice {
353	__le16 s_label; /* label */
354	__le16 s_flags; /* permission flags */
355	__le32 start_sect; /* starting sector */
356	__le32 nr_sects; /* number of sectors in slice */
357	};
358
359	struct unixware_disklabel {
360	__le32 d_type; /* drive type */
361	__le32 d_magic; /* the magic number */
362	__le32 d_version; /* version number */
363	char d_serial[12]; /* serial number of the device */
364	__le32 d_ncylinders; /* # of data cylinders per device */
365	__le32 d_ntracks; /* # of tracks per cylinder */
366	__le32 d_nsectors; /* # of data sectors per track */
367	__le32 d_secsize; /* # of bytes per sector */
368	__le32 d_part_start; /* # of first sector of this partition */
369	__le32 d_unknown1[12]; /* ? */
370	__le32 d_alt_tbl; /* byte offset of alternate table */
371	__le32 d_alt_len; /* byte length of alternate table */
372	__le32 d_phys_cyl; /* # of physical cylinders per device */
373	__le32 d_phys_trk; /* # of physical tracks per cylinder */
374	__le32 d_phys_sec; /* # of physical sectors per track */
375	__le32 d_phys_bytes; /* # of physical bytes per sector */
376	__le32 d_unknown2; /* ? */
377	__le32 d_unknown3; /* ? */
378	__le32 d_pad[8]; /* pad */
379
380	struct unixware_vtoc {
381	__le32 v_magic; /* the magic number */
382	__le32 v_version; /* version number */
383	char v_name[8]; /* volume name */
384	__le16 v_nslices; /* # of slices */
385	__le16 v_unknown1; /* ? */
386	__le32 v_reserved[10]; /* reserved */
387	struct unixware_slice
388	v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
389	} vtoc;
390
391	}; /* 408 */
392
393	#endif /* CONFIG_UNIXWARE_DISKLABEL */
394
395	#ifdef CONFIG_MINIX_SUBPARTITION
396	# define MINIX_NR_SUBPARTITIONS 4
397	#endif /* CONFIG_MINIX_SUBPARTITION */
398
399	#ifdef __KERNEL__
400
401	char disk_name (struct gendisk hd, int part, char *buf);
402
403	extern int rescan_partitions(struct gendisk disk, struct block_device bdev);
404	extern void add_partition(struct gendisk *, int, sector_t, sector_t);
405	extern void delete_partition(struct gendisk *, int);
406
1946089a	407	extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 LT	408	extern struct gendisk *alloc_disk(int minors);
	409	extern struct kobject get_disk(struct gendisk disk);
	410	extern void put_disk(struct gendisk *disk);
	411
	412	extern void blk_register_region(dev_t dev, unsigned long range,
	413	struct module *module,
	414	struct kobject (probe)(dev_t, int , void ),
	415	int (lock)(dev_t, void ),
	416	void *data);
	417	extern void blk_unregister_region(dev_t dev, unsigned long range);
	418
	419	static inline struct block_device bdget_disk(struct gendisk disk, int index)
	420	{
	421	return bdget(MKDEV(disk->major, disk->first_minor) + index);
	422	}
	423
	424	#endif
	425
	426	#endif