[linux-2.6-block.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/types.h>

#ifdef CONFIG_BLOCK

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

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;
	struct kobject *holder_dir;
	unsigned ios[2], sectors[2];	/* READs and WRITEs */
	int policy, partno;
#ifdef CONFIG_FAIL_MAKE_REQUEST
	int make_it_fail;
#endif
};

#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
#define GENHD_FL_FAIL				64

struct disk_stats {
	unsigned long sectors[2];	/* READs and WRITEs */
	unsigned long ios[2];
	unsigned long merges[2];
	unsigned long ticks[2];
	unsigned long io_ticks;
	unsigned long 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] */
	int part_uevent_suppress;
	struct block_device_operations *fops;
	struct request_queue *queue;
	void *private_data;
	sector_t capacity;

	int flags;
	struct device *driverfs_dev;
	struct kobject kobj;
	struct kobject *holder_dir;
	struct kobject *slave_dir;

	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_each_possible_cpu(i)					\
		res += per_cpu_ptr(gendiskp->dkstats, i)->field;	\
	res;								\
})

static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)	{
	int i;
	for_each_possible_cpu(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

#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
1da177e4	12	#include <linux/types.h>
1da177e4	13
9361401e DH	14	#ifdef CONFIG_BLOCK
9361401e DH	15
1da177e4 LT	16	enum {
	17	/* These three have identical behaviour; use the second one if DOS FDISK gets
	18	confused about extended/logical partitions starting past cylinder 1023. */
	19	DOS_EXTENDED_PARTITION = 5,
	20	LINUX_EXTENDED_PARTITION = 0x85,
	21	WIN98_EXTENDED_PARTITION = 0x0f,
	22
	23	LINUX_SWAP_PARTITION = 0x82,
	24	LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
	25
	26	SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
	27	NEW_SOLARIS_X86_PARTITION = 0xbf,
	28
	29	DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
	30	DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
	31	DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
	32	EZD_PARTITION = 0x55, /* EZ-DRIVE */
	33
	34	FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
	35	OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
	36	NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
	37	BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
	38	MINIX_PARTITION = 0x81, /* Minix Partition ID */
	39	UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
	40	};
	41
	42	#ifndef __KERNEL__
	43
	44	struct partition {
	45	unsigned char boot_ind; /* 0x80 - active */
	46	unsigned char head; /* starting head */
	47	unsigned char sector; /* starting sector */
	48	unsigned char cyl; /* starting cylinder */
	49	unsigned char sys_ind; /* What partition type */
	50	unsigned char end_head; /* end head */
	51	unsigned char end_sector; /* end sector */
	52	unsigned char end_cyl; /* end cylinder */
	53	unsigned int start_sect; /* starting sector counting from 0 */
	54	unsigned int nr_sects; /* nr of sectors in partition */
	55	} __attribute__((packed));
	56
	57	#endif
	58
	59	#ifdef __KERNEL__
34186efc DW	60	#include <linux/major.h>
	61	#include <linux/device.h>
	62	#include <linux/smp.h>
	63	#include <linux/string.h>
	64	#include <linux/fs.h>
	65
1da177e4 LT	66	struct partition {
	67	unsigned char boot_ind; /* 0x80 - active */
	68	unsigned char head; /* starting head */
	69	unsigned char sector; /* starting sector */
	70	unsigned char cyl; /* starting cylinder */
	71	unsigned char sys_ind; /* What partition type */
	72	unsigned char end_head; /* end head */
	73	unsigned char end_sector; /* end sector */
	74	unsigned char end_cyl; /* end cylinder */
	75	__le32 start_sect; /* starting sector counting from 0 */
	76	__le32 nr_sects; /* nr of sectors in partition */
	77	} __attribute__((packed));
	78
	79	struct hd_struct {
	80	sector_t start_sect;
	81	sector_t nr_sects;
	82	struct kobject kobj;
6a4d44c1	83	struct kobject *holder_dir;
47a00410	84	unsigned ios[2], sectors[2]; /* READs and WRITEs */
1da177e4	85	int policy, partno;
c17bb495 AM	86	#ifdef CONFIG_FAIL_MAKE_REQUEST
	87	int make_it_fail;
	88	#endif
1da177e4 LT	89	};
	90
	91	#define GENHD_FL_REMOVABLE 1
	92	#define GENHD_FL_DRIVERFS 2
	93	#define GENHD_FL_CD 8
	94	#define GENHD_FL_UP 16
	95	#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
c17bb495	96	#define GENHD_FL_FAIL 64
1da177e4 LT	97
1da177e4 LT	98	struct disk_stats {
837c7878 BW	99	unsigned long sectors[2]; /* READs and WRITEs */
	100	unsigned long ios[2];
	101	unsigned long merges[2];
	102	unsigned long ticks[2];
	103	unsigned long io_ticks;
	104	unsigned long time_in_queue;
1da177e4 LT	105	};
	106
	107	struct gendisk {
	108	int major; /* major number of driver */
	109	int first_minor;
	110	int minors; /* maximum number of minors, =1 for
	111	* disks that can't be partitioned. */
	112	char disk_name[32]; /* name of major driver */
	113	struct hd_struct *part; / [indexed by minor] */
d4d7e5df	114	int part_uevent_suppress;
1da177e4 LT	115	struct block_device_operations *fops;
	116	struct request_queue *queue;
	117	void *private_data;
	118	sector_t capacity;
	119
	120	int flags;
1da177e4 LT	121	struct device *driverfs_dev;
1da177e4 LT	122	struct kobject kobj;
6a4d44c1 JN	123	struct kobject *holder_dir;
6a4d44c1 JN	124	struct kobject *slave_dir;
1da177e4 LT	125
	126	struct timer_rand_state *random;
	127	int policy;
	128
	129	atomic_t sync_io; /* RAID */
20e5c81f	130	unsigned long stamp;
1da177e4 LT	131	int in_flight;
	132	#ifdef CONFIG_SMP
	133	struct disk_stats *dkstats;
	134	#else
	135	struct disk_stats dkstats;
	136	#endif
	137	};
	138
	139	/* Structure for sysfs attributes on block devices */
	140	struct disk_attribute {
	141	struct attribute attr;
	142	ssize_t (show)(struct gendisk , char *);
a7fd6706	143	ssize_t (store)(struct gendisk , const char *, size_t);
1da177e4 LT	144	};
	145
	146	/*
	147	* Macros to operate on percpu disk statistics:
	148	*
	149	* The __ variants should only be called in critical sections. The full
	150	* variants disable/enable preemption.
	151	*/
	152	#ifdef CONFIG_SMP
	153	#define __disk_stat_add(gendiskp, field, addnd) \
	154	(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
	155
	156	#define disk_stat_read(gendiskp, field) \
	157	({ \
	158	typeof(gendiskp->dkstats->field) res = 0; \
	159	int i; \
0a945022	160	for_each_possible_cpu(i) \
1da177e4	161	res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4 LT	162	res; \
	163	})
	164
	165	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	166	int i;
0a945022	167	for_each_possible_cpu(i)
394e3902 AM	168	memset(per_cpu_ptr(gendiskp->dkstats, i), value,
394e3902 AM	169	sizeof (struct disk_stats));
1da177e4 LT	170	}
	171
	172	#else
	173	#define __disk_stat_add(gendiskp, field, addnd) \
	174	(gendiskp->dkstats.field += addnd)
	175	#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
	176
	177	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	178	memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
	179	}
	180	#endif
	181
	182	#define disk_stat_add(gendiskp, field, addnd) \
	183	do { \
	184	preempt_disable(); \
	185	__disk_stat_add(gendiskp, field, addnd); \
	186	preempt_enable(); \
	187	} while (0)
	188
	189	#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
	190	#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
	191
	192	#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
	193	#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
	194
	195	#define __disk_stat_sub(gendiskp, field, subnd) \
	196	__disk_stat_add(gendiskp, field, -subnd)
	197	#define disk_stat_sub(gendiskp, field, subnd) \
	198	disk_stat_add(gendiskp, field, -subnd)
	199
	200
	201	/* Inlines to alloc and free disk stats in struct gendisk */
	202	#ifdef CONFIG_SMP
	203	static inline int init_disk_stats(struct gendisk *disk)
	204	{
	205	disk->dkstats = alloc_percpu(struct disk_stats);
	206	if (!disk->dkstats)
	207	return 0;
	208	return 1;
	209	}
	210
	211	static inline void free_disk_stats(struct gendisk *disk)
	212	{
	213	free_percpu(disk->dkstats);
	214	}
	215	#else /* CONFIG_SMP */
	216	static inline int init_disk_stats(struct gendisk *disk)
	217	{
	218	return 1;
	219	}
	220
	221	static inline void free_disk_stats(struct gendisk *disk)
	222	{
	223	}
	224	#endif /* CONFIG_SMP */
	225
	226	/* drivers/block/ll_rw_blk.c */
	227	extern void disk_round_stats(struct gendisk *disk);
	228
	229	/* drivers/block/genhd.c */
ac20427e	230	extern int get_blkdev_list(char *, int);
1da177e4 LT	231	extern void add_disk(struct gendisk *disk);
	232	extern void del_gendisk(struct gendisk *gp);
	233	extern void unlink_gendisk(struct gendisk *gp);
	234	extern struct gendisk get_gendisk(dev_t dev, int part);
	235
	236	extern void set_device_ro(struct block_device *bdev, int flag);
	237	extern void set_disk_ro(struct gendisk *disk, int flag);
	238
	239	/* drivers/char/random.c */
	240	extern void add_disk_randomness(struct gendisk *disk);
	241	extern void rand_initialize_disk(struct gendisk *disk);
	242
	243	static inline sector_t get_start_sect(struct block_device *bdev)
	244	{
	245	return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
	246	}
	247	static inline sector_t get_capacity(struct gendisk *disk)
	248	{
	249	return disk->capacity;
	250	}
	251	static inline void set_capacity(struct gendisk *disk, sector_t size)
	252	{
	253	disk->capacity = size;
	254	}
	255
	256	#endif /* __KERNEL__ */
	257
	258	#ifdef CONFIG_SOLARIS_X86_PARTITION
	259
	260	#define SOLARIS_X86_NUMSLICE 8
	261	#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
	262
	263	struct solaris_x86_slice {
	264	__le16 s_tag; /* ID tag of partition */
	265	__le16 s_flag; /* permission flags */
	266	__le32 s_start; /* start sector no of partition */
	267	__le32 s_size; /* # of blocks in partition */
	268	};
	269
	270	struct solaris_x86_vtoc {
	271	unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
	272	__le32 v_sanity; /* to verify vtoc sanity */
	273	__le32 v_version; /* layout version */
	274	char v_volume[8]; /* volume name */
	275	__le16 v_sectorsz; /* sector size in bytes */
	276	__le16 v_nparts; /* number of partitions */
	277	unsigned int v_reserved[10]; /* free space */
	278	struct solaris_x86_slice
	279	v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	280	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	281	char v_asciilabel[128]; /* for compatibility */
	282	};
	283
	284	#endif /* CONFIG_SOLARIS_X86_PARTITION */
	285
	286	#ifdef CONFIG_BSD_DISKLABEL
	287	/*
	288	* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
	289	* updated by Marc Espie <Marc.Espie@openbsd.org>
	290	*/
	291
	292	/* check against BSD src/sys/sys/disklabel.h for consistency */
	293
	294	#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
295	#define BSD_MAXPARTITIONS 16
296	#define OPENBSD_MAXPARTITIONS 16
297	#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
298	struct bsd_disklabel {
299	__le32 d_magic; /* the magic number */
300	__s16 d_type; /* drive type */
301	__s16 d_subtype; /* controller/d_type specific */
302	char d_typename[16]; /* type name, e.g. "eagle" */
303	char d_packname[16]; /* pack identifier */
304	__u32 d_secsize; /* # of bytes per sector */
305	__u32 d_nsectors; /* # of data sectors per track */
306	__u32 d_ntracks; /* # of tracks per cylinder */
307	__u32 d_ncylinders; /* # of data cylinders per unit */
308	__u32 d_secpercyl; /* # of data sectors per cylinder */
309	__u32 d_secperunit; /* # of data sectors per unit */
310	__u16 d_sparespertrack; /* # of spare sectors per track */
311	__u16 d_sparespercyl; /* # of spare sectors per cylinder */
312	__u32 d_acylinders; /* # of alt. cylinders per unit */
313	__u16 d_rpm; /* rotational speed */
314	__u16 d_interleave; /* hardware sector interleave */
315	__u16 d_trackskew; /* sector 0 skew, per track */
316	__u16 d_cylskew; /* sector 0 skew, per cylinder */
317	__u32 d_headswitch; /* head switch time, usec */
318	__u32 d_trkseek; /* track-to-track seek, usec */
319	__u32 d_flags; /* generic flags */
320	#define NDDATA 5
321	__u32 d_drivedata[NDDATA]; /* drive-type specific information */
322	#define NSPARE 5
323	__u32 d_spare[NSPARE]; /* reserved for future use */
324	__le32 d_magic2; /* the magic number (again) */
325	__le16 d_checksum; /* xor of data incl. partitions */
326
327	/* filesystem and partition information: */
328	__le16 d_npartitions; /* number of partitions in following */
329	__le32 d_bbsize; /* size of boot area at sn0, bytes */
330	__le32 d_sbsize; /* max size of fs superblock, bytes */
331	struct bsd_partition { /* the partition table */
332	__le32 p_size; /* number of sectors in partition */
333	__le32 p_offset; /* starting sector */
334	__le32 p_fsize; /* filesystem basic fragment size */
335	__u8 p_fstype; /* filesystem type, see below */
336	__u8 p_frag; /* filesystem fragments per block */
337	__le16 p_cpg; /* filesystem cylinders per group */
338	} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
339	};
340
341	#endif /* CONFIG_BSD_DISKLABEL */
342
343	#ifdef CONFIG_UNIXWARE_DISKLABEL
344	/*
345	* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
346	* and Krzysztof G. Baranowski <kgb@knm.org.pl>
347	*/
348
349	#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
350	#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
351	#define UNIXWARE_NUMSLICE 16
352	#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
353
354	struct unixware_slice {
355	__le16 s_label; /* label */
356	__le16 s_flags; /* permission flags */
357	__le32 start_sect; /* starting sector */
358	__le32 nr_sects; /* number of sectors in slice */
359	};
360
361	struct unixware_disklabel {
362	__le32 d_type; /* drive type */
363	__le32 d_magic; /* the magic number */
364	__le32 d_version; /* version number */
365	char d_serial[12]; /* serial number of the device */
366	__le32 d_ncylinders; /* # of data cylinders per device */
367	__le32 d_ntracks; /* # of tracks per cylinder */
368	__le32 d_nsectors; /* # of data sectors per track */
369	__le32 d_secsize; /* # of bytes per sector */
370	__le32 d_part_start; /* # of first sector of this partition */
371	__le32 d_unknown1[12]; /* ? */
372	__le32 d_alt_tbl; /* byte offset of alternate table */
373	__le32 d_alt_len; /* byte length of alternate table */
374	__le32 d_phys_cyl; /* # of physical cylinders per device */
375	__le32 d_phys_trk; /* # of physical tracks per cylinder */
376	__le32 d_phys_sec; /* # of physical sectors per track */
377	__le32 d_phys_bytes; /* # of physical bytes per sector */
378	__le32 d_unknown2; /* ? */
379	__le32 d_unknown3; /* ? */
380	__le32 d_pad[8]; /* pad */
381
382	struct unixware_vtoc {
383	__le32 v_magic; /* the magic number */
384	__le32 v_version; /* version number */
385	char v_name[8]; /* volume name */
386	__le16 v_nslices; /* # of slices */
387	__le16 v_unknown1; /* ? */
388	__le32 v_reserved[10]; /* reserved */
389	struct unixware_slice
390	v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
391	} vtoc;
392
393	}; /* 408 */
394
395	#endif /* CONFIG_UNIXWARE_DISKLABEL */
396
397	#ifdef CONFIG_MINIX_SUBPARTITION
398	# define MINIX_NR_SUBPARTITIONS 4
399	#endif /* CONFIG_MINIX_SUBPARTITION */
400
401	#ifdef __KERNEL__
402
403	char disk_name (struct gendisk hd, int part, char *buf);
404
405	extern int rescan_partitions(struct gendisk disk, struct block_device bdev);
406	extern void add_partition(struct gendisk *, int, sector_t, sector_t);
407	extern void delete_partition(struct gendisk *, int);
408
1946089a	409	extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 LT	410	extern struct gendisk *alloc_disk(int minors);
	411	extern struct kobject get_disk(struct gendisk disk);
	412	extern void put_disk(struct gendisk *disk);
	413
	414	extern void blk_register_region(dev_t dev, unsigned long range,
	415	struct module *module,
	416	struct kobject (probe)(dev_t, int , void ),
	417	int (lock)(dev_t, void ),
	418	void *data);
	419	extern void blk_unregister_region(dev_t dev, unsigned long range);
	420
	421	static inline struct block_device bdget_disk(struct gendisk disk, int index)
	422	{
	423	return bdget(MKDEV(disk->major, disk->first_minor) + index);
	424	}
	425
	426	#endif
	427
	428	#endif
9361401e DH	429
9361401e DH	430	#endif