[mirror_ubuntu-eoan-kernel.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>
#include <linux/kdev_t.h>

#ifdef CONFIG_BLOCK

#define kobj_to_dev(k) container_of(k, struct device, kobj)
#define dev_to_disk(device) container_of(device, struct gendisk, dev)
#define dev_to_part(device) container_of(device, struct hd_struct, dev)

extern struct device_type part_type;
extern struct kobject *block_depr;
extern struct class block_class;

extern const struct seq_operations partitions_op;
extern const struct seq_operations diskstats_op;

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,

	SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,

	LINUX_SWAP_PARTITION = 0x82,
	LINUX_DATA_PARTITION = 0x83,
	LINUX_LVM_PARTITION = 0x8e,
	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>
#include <linux/workqueue.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 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 hd_struct {
	sector_t start_sect;
	sector_t nr_sects;
	struct device dev;
	struct kobject *holder_dir;
	int policy, partno;
#ifdef CONFIG_FAIL_MAKE_REQUEST
	int make_it_fail;
#endif
	unsigned long stamp;
	int in_flight;
#ifdef	CONFIG_SMP
	struct disk_stats *dkstats;
#else
	struct disk_stats dkstats;
#endif
};

#define GENHD_FL_REMOVABLE			1
#define GENHD_FL_DRIVERFS			2
#define GENHD_FL_MEDIA_CHANGE_NOTIFY		4
#define GENHD_FL_CD				8
#define GENHD_FL_UP				16
#define GENHD_FL_SUPPRESS_PARTITION_INFO	32
#define GENHD_FL_FAIL				64


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;
	struct device *driverfs_dev;  // FIXME: remove
	struct device dev;
	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
	struct work_struct async_notify;
};

/* 
 * Macros to operate on percpu disk statistics:
 *
 * The __ variants should only be called in critical sections. The full
 * variants disable/enable preemption.
 */
static inline struct hd_struct *get_part(struct gendisk *gendiskp,
					 sector_t sector)
{
	struct hd_struct *part;
	int i;
	for (i = 0; i < gendiskp->minors - 1; i++) {
		part = gendiskp->part[i];
		if (part && part->start_sect <= sector
		    && sector < part->start_sect + part->nr_sects)
			return part;
	}
	return NULL;
}

#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));
}		

#define __part_stat_add(part, field, addnd)				\
	(per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)

#define __all_stat_add(gendiskp, field, addnd, sector)		\
({								\
	struct hd_struct *part = get_part(gendiskp, sector);	\
	if (part)						\
		__part_stat_add(part, field, addnd);		\
	__disk_stat_add(gendiskp, field, addnd);		\
})

#define part_stat_read(part, field)					\
({									\
	typeof(part->dkstats->field) res = 0;				\
	int i;								\
	for_each_possible_cpu(i)					\
		res += per_cpu_ptr(part->dkstats, i)->field;		\
	res;								\
})

static inline void part_stat_set_all(struct hd_struct *part, int value)	{
	int i;
	for_each_possible_cpu(i)
		memset(per_cpu_ptr(part->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));
}

#define __part_stat_add(part, field, addnd) \
	(part->dkstats.field += addnd)

#define __all_stat_add(gendiskp, field, addnd, sector)		\
({								\
	struct hd_struct *part = get_part(gendiskp, sector);	\
	if (part)						\
		part->dkstats.field += addnd;			\
	__disk_stat_add(gendiskp, field, addnd);		\
})

#define part_stat_read(part, field)	(part->dkstats.field)

static inline void part_stat_set_all(struct hd_struct *part, int value)
{
	memset(&part->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)

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

#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)

#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)

#define __part_stat_sub(gendiskp, field, subnd) \
		__part_stat_add(gendiskp, field, -subnd)
#define part_stat_sub(gendiskp, field, subnd) \
		part_stat_add(gendiskp, field, -subnd)

#define all_stat_add(gendiskp, field, addnd, sector)		\
	do {							\
		preempt_disable();				\
		__all_stat_add(gendiskp, field, addnd, sector);	\
		preempt_enable();				\
	} while (0)

#define __all_stat_dec(gendiskp, field, sector) \
		__all_stat_add(gendiskp, field, -1, sector)
#define all_stat_dec(gendiskp, field, sector) \
		all_stat_add(gendiskp, field, -1, sector)

#define __all_stat_inc(gendiskp, field, sector) \
		__all_stat_add(gendiskp, field, 1, sector)
#define all_stat_inc(gendiskp, field, sector) \
		all_stat_add(gendiskp, field, 1, sector)

#define __all_stat_sub(gendiskp, field, subnd, sector) \
		__all_stat_add(gendiskp, field, -subnd, sector)
#define all_stat_sub(gendiskp, field, subnd, sector) \
		all_stat_add(gendiskp, field, -subnd, sector)

/* 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);
}

static inline int init_part_stats(struct hd_struct *part)
{
	part->dkstats = alloc_percpu(struct disk_stats);
	if (!part->dkstats)
		return 0;
	return 1;
}

static inline void free_part_stats(struct hd_struct *part)
{
	free_percpu(part->dkstats);
}

#else	/* CONFIG_SMP */
static inline int init_disk_stats(struct gendisk *disk)
{
	return 1;
}

static inline void free_disk_stats(struct gendisk *disk)
{
}

static inline int init_part_stats(struct hd_struct *part)
{
	return 1;
}

static inline void free_part_stats(struct hd_struct *part)
{
}
#endif	/* CONFIG_SMP */

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

/* 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	16
#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__

#define ADDPART_FLAG_NONE	0
#define ADDPART_FLAG_RAID	1
#define ADDPART_FLAG_WHOLEDISK	2

extern dev_t blk_lookup_devt(const char *name);
extern 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, int);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);

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 devt, 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 devt, 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

#else /* CONFIG_BLOCK */

static inline void printk_all_partitions(void) { }

static inline dev_t blk_lookup_devt(const char *name)
{
	dev_t devt = MKDEV(0, 0);
	return devt;
}

#endif /* CONFIG_BLOCK */

#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>
edfaa7c3	13	#include <linux/kdev_t.h>
1da177e4	14
9361401e DH	15	#ifdef CONFIG_BLOCK
9361401e DH	16
edfaa7c3 KS	17	#define kobj_to_dev(k) container_of(k, struct device, kobj)
	18	#define dev_to_disk(device) container_of(device, struct gendisk, dev)
	19	#define dev_to_part(device) container_of(device, struct hd_struct, dev)
	20
edfaa7c3 KS	21	extern struct device_type part_type;
	22	extern struct kobject *block_depr;
	23	extern struct class block_class;
	24
a0db701a AB	25	extern const struct seq_operations partitions_op;
	26	extern const struct seq_operations diskstats_op;
	27
1da177e4 LT	28	enum {
	29	/* These three have identical behaviour; use the second one if DOS FDISK gets
	30	confused about extended/logical partitions starting past cylinder 1023. */
	31	DOS_EXTENDED_PARTITION = 5,
	32	LINUX_EXTENDED_PARTITION = 0x85,
	33	WIN98_EXTENDED_PARTITION = 0x0f,
	34
d18d7682 FMDN	35	SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
d18d7682 FMDN	36
1da177e4	37	LINUX_SWAP_PARTITION = 0x82,
4419d1ac OH	38	LINUX_DATA_PARTITION = 0x83,
4419d1ac OH	39	LINUX_LVM_PARTITION = 0x8e,
1da177e4 LT	40	LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
	41
	42	SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
	43	NEW_SOLARIS_X86_PARTITION = 0xbf,
	44
	45	DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
	46	DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
	47	DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
	48	EZD_PARTITION = 0x55, /* EZ-DRIVE */
	49
	50	FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
	51	OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
	52	NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
	53	BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
	54	MINIX_PARTITION = 0x81, /* Minix Partition ID */
	55	UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
	56	};
	57
	58	#ifndef __KERNEL__
	59
	60	struct partition {
	61	unsigned char boot_ind; /* 0x80 - active */
	62	unsigned char head; /* starting head */
	63	unsigned char sector; /* starting sector */
	64	unsigned char cyl; /* starting cylinder */
	65	unsigned char sys_ind; /* What partition type */
	66	unsigned char end_head; /* end head */
	67	unsigned char end_sector; /* end sector */
	68	unsigned char end_cyl; /* end cylinder */
	69	unsigned int start_sect; /* starting sector counting from 0 */
	70	unsigned int nr_sects; /* nr of sectors in partition */
	71	} __attribute__((packed));
	72
	73	#endif
	74
	75	#ifdef __KERNEL__
34186efc DW	76	#include <linux/major.h>
	77	#include <linux/device.h>
	78	#include <linux/smp.h>
	79	#include <linux/string.h>
	80	#include <linux/fs.h>
8ce7ad7b	81	#include <linux/workqueue.h>
34186efc	82
1da177e4 LT	83	struct partition {
	84	unsigned char boot_ind; /* 0x80 - active */
	85	unsigned char head; /* starting head */
	86	unsigned char sector; /* starting sector */
	87	unsigned char cyl; /* starting cylinder */
	88	unsigned char sys_ind; /* What partition type */
	89	unsigned char end_head; /* end head */
	90	unsigned char end_sector; /* end sector */
	91	unsigned char end_cyl; /* end cylinder */
	92	__le32 start_sect; /* starting sector counting from 0 */
	93	__le32 nr_sects; /* nr of sectors in partition */
	94	} __attribute__((packed));
	95
ea5c48ab JM	96	struct disk_stats {
	97	unsigned long sectors[2]; /* READs and WRITEs */
	98	unsigned long ios[2];
	99	unsigned long merges[2];
	100	unsigned long ticks[2];
	101	unsigned long io_ticks;
	102	unsigned long time_in_queue;
	103	};
	104
1da177e4 LT	105	struct hd_struct {
	106	sector_t start_sect;
	107	sector_t nr_sects;
edfaa7c3	108	struct device dev;
6a4d44c1	109	struct kobject *holder_dir;
1da177e4	110	int policy, partno;
c17bb495 AM	111	#ifdef CONFIG_FAIL_MAKE_REQUEST
c17bb495 AM	112	int make_it_fail;
ea5c48ab JM	113	#endif
	114	unsigned long stamp;
	115	int in_flight;
	116	#ifdef CONFIG_SMP
	117	struct disk_stats *dkstats;
	118	#else
	119	struct disk_stats dkstats;
c17bb495	120	#endif
1da177e4 LT	121	};
	122
	123	#define GENHD_FL_REMOVABLE 1
	124	#define GENHD_FL_DRIVERFS 2
86ce18d7	125	#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4 LT	126	#define GENHD_FL_CD 8
	127	#define GENHD_FL_UP 16
	128	#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
c17bb495	129	#define GENHD_FL_FAIL 64
1da177e4	130
ea5c48ab	131
1da177e4 LT	132	struct gendisk {
	133	int major; /* major number of driver */
	134	int first_minor;
	135	int minors; /* maximum number of minors, =1 for
	136	* disks that can't be partitioned. */
	137	char disk_name[32]; /* name of major driver */
	138	struct hd_struct *part; / [indexed by minor] */
	139	struct block_device_operations *fops;
	140	struct request_queue *queue;
	141	void *private_data;
	142	sector_t capacity;
	143
	144	int flags;
edfaa7c3 KS	145	struct device *driverfs_dev; // FIXME: remove
edfaa7c3 KS	146	struct device dev;
6a4d44c1 JN	147	struct kobject *holder_dir;
6a4d44c1 JN	148	struct kobject *slave_dir;
1da177e4 LT	149
	150	struct timer_rand_state *random;
	151	int policy;
	152
	153	atomic_t sync_io; /* RAID */
20e5c81f	154	unsigned long stamp;
1da177e4 LT	155	int in_flight;
	156	#ifdef CONFIG_SMP
	157	struct disk_stats *dkstats;
	158	#else
	159	struct disk_stats dkstats;
	160	#endif
8ce7ad7b	161	struct work_struct async_notify;
1da177e4 LT	162	};
1da177e4 LT	163
1da177e4 LT	164	/*
	165	* Macros to operate on percpu disk statistics:
	166	*
	167	* The __ variants should only be called in critical sections. The full
	168	* variants disable/enable preemption.
	169	*/
ea5c48ab JM	170	static inline struct hd_struct get_part(struct gendisk gendiskp,
	171	sector_t sector)
	172	{
	173	struct hd_struct *part;
	174	int i;
	175	for (i = 0; i < gendiskp->minors - 1; i++) {
	176	part = gendiskp->part[i];
	177	if (part && part->start_sect <= sector
	178	&& sector < part->start_sect + part->nr_sects)
	179	return part;
	180	}
	181	return NULL;
	182	}
	183
1da177e4 LT	184	#ifdef CONFIG_SMP
	185	#define __disk_stat_add(gendiskp, field, addnd) \
	186	(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
	187
	188	#define disk_stat_read(gendiskp, field) \
	189	({ \
	190	typeof(gendiskp->dkstats->field) res = 0; \
	191	int i; \
0a945022	192	for_each_possible_cpu(i) \
1da177e4	193	res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4 LT	194	res; \
	195	})
	196
	197	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	198	int i;
0a945022	199	for_each_possible_cpu(i)
394e3902 AM	200	memset(per_cpu_ptr(gendiskp->dkstats, i), value,
394e3902 AM	201	sizeof (struct disk_stats));
1da177e4	202	}
ea5c48ab JM	203
	204	#define __part_stat_add(part, field, addnd) \
	205	(per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
	206
	207	#define __all_stat_add(gendiskp, field, addnd, sector) \
	208	({ \
	209	struct hd_struct *part = get_part(gendiskp, sector); \
	210	if (part) \
	211	__part_stat_add(part, field, addnd); \
	212	__disk_stat_add(gendiskp, field, addnd); \
	213	})
	214
	215	#define part_stat_read(part, field) \
	216	({ \
	217	typeof(part->dkstats->field) res = 0; \
	218	int i; \
	219	for_each_possible_cpu(i) \
	220	res += per_cpu_ptr(part->dkstats, i)->field; \
	221	res; \
	222	})
	223
	224	static inline void part_stat_set_all(struct hd_struct *part, int value) {
	225	int i;
	226	for_each_possible_cpu(i)
	227	memset(per_cpu_ptr(part->dkstats, i), value,
	228	sizeof(struct disk_stats));
	229	}
1da177e4 LT	230
	231	#else
	232	#define __disk_stat_add(gendiskp, field, addnd) \
	233	(gendiskp->dkstats.field += addnd)
	234	#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
	235
ea5c48ab JM	236	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
ea5c48ab JM	237	{
1da177e4 LT	238	memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
1da177e4 LT	239	}
ea5c48ab JM	240
	241	#define __part_stat_add(part, field, addnd) \
	242	(part->dkstats.field += addnd)
	243
	244	#define __all_stat_add(gendiskp, field, addnd, sector) \
	245	({ \
	246	struct hd_struct *part = get_part(gendiskp, sector); \
	247	if (part) \
	248	part->dkstats.field += addnd; \
	249	__disk_stat_add(gendiskp, field, addnd); \
	250	})
	251
	252	#define part_stat_read(part, field) (part->dkstats.field)
	253
	254	static inline void part_stat_set_all(struct hd_struct *part, int value)
	255	{
	256	memset(&part->dkstats, value, sizeof(struct disk_stats));
	257	}
	258
1da177e4 LT	259	#endif
	260
	261	#define disk_stat_add(gendiskp, field, addnd) \
	262	do { \
	263	preempt_disable(); \
	264	__disk_stat_add(gendiskp, field, addnd); \
	265	preempt_enable(); \
	266	} while (0)
	267
	268	#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
	269	#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
	270
	271	#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
	272	#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
	273
	274	#define __disk_stat_sub(gendiskp, field, subnd) \
	275	__disk_stat_add(gendiskp, field, -subnd)
	276	#define disk_stat_sub(gendiskp, field, subnd) \
	277	disk_stat_add(gendiskp, field, -subnd)
	278
ea5c48ab JM	279	#define part_stat_add(gendiskp, field, addnd) \
	280	do { \
	281	preempt_disable(); \
	282	__part_stat_add(gendiskp, field, addnd);\
	283	preempt_enable(); \
	284	} while (0)
	285
	286	#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
	287	#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
	288
	289	#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
	290	#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
	291
	292	#define __part_stat_sub(gendiskp, field, subnd) \
	293	__part_stat_add(gendiskp, field, -subnd)
	294	#define part_stat_sub(gendiskp, field, subnd) \
	295	part_stat_add(gendiskp, field, -subnd)
	296
	297	#define all_stat_add(gendiskp, field, addnd, sector) \
	298	do { \
	299	preempt_disable(); \
	300	__all_stat_add(gendiskp, field, addnd, sector); \
	301	preempt_enable(); \
	302	} while (0)
	303
	304	#define __all_stat_dec(gendiskp, field, sector) \
	305	__all_stat_add(gendiskp, field, -1, sector)
	306	#define all_stat_dec(gendiskp, field, sector) \
	307	all_stat_add(gendiskp, field, -1, sector)
	308
	309	#define __all_stat_inc(gendiskp, field, sector) \
	310	__all_stat_add(gendiskp, field, 1, sector)
	311	#define all_stat_inc(gendiskp, field, sector) \
	312	all_stat_add(gendiskp, field, 1, sector)
	313
	314	#define __all_stat_sub(gendiskp, field, subnd, sector) \
	315	__all_stat_add(gendiskp, field, -subnd, sector)
	316	#define all_stat_sub(gendiskp, field, subnd, sector) \
	317	all_stat_add(gendiskp, field, -subnd, sector)
1da177e4 LT	318
	319	/* Inlines to alloc and free disk stats in struct gendisk */
	320	#ifdef CONFIG_SMP
	321	static inline int init_disk_stats(struct gendisk *disk)
	322	{
	323	disk->dkstats = alloc_percpu(struct disk_stats);
	324	if (!disk->dkstats)
	325	return 0;
	326	return 1;
	327	}
	328
	329	static inline void free_disk_stats(struct gendisk *disk)
	330	{
	331	free_percpu(disk->dkstats);
	332	}
ea5c48ab JM	333
	334	static inline int init_part_stats(struct hd_struct *part)
	335	{
	336	part->dkstats = alloc_percpu(struct disk_stats);
	337	if (!part->dkstats)
	338	return 0;
	339	return 1;
	340	}
	341
	342	static inline void free_part_stats(struct hd_struct *part)
	343	{
	344	free_percpu(part->dkstats);
	345	}
	346
1da177e4 LT	347	#else /* CONFIG_SMP */
	348	static inline int init_disk_stats(struct gendisk *disk)
	349	{
	350	return 1;
	351	}
	352
	353	static inline void free_disk_stats(struct gendisk *disk)
	354	{
	355	}
ea5c48ab JM	356
	357	static inline int init_part_stats(struct hd_struct *part)
	358	{
	359	return 1;
	360	}
	361
	362	static inline void free_part_stats(struct hd_struct *part)
	363	{
	364	}
1da177e4 LT	365	#endif /* CONFIG_SMP */
	366
	367	/* drivers/block/ll_rw_blk.c */
	368	extern void disk_round_stats(struct gendisk *disk);
6f2576af	369	extern void part_round_stats(struct hd_struct *part);
1da177e4 LT	370
1da177e4 LT	371	/* drivers/block/genhd.c */
ac20427e	372	extern int get_blkdev_list(char *, int);
1da177e4 LT	373	extern void add_disk(struct gendisk *disk);
	374	extern void del_gendisk(struct gendisk *gp);
	375	extern void unlink_gendisk(struct gendisk *gp);
	376	extern struct gendisk get_gendisk(dev_t dev, int part);
	377
	378	extern void set_device_ro(struct block_device *bdev, int flag);
	379	extern void set_disk_ro(struct gendisk *disk, int flag);
	380
	381	/* drivers/char/random.c */
	382	extern void add_disk_randomness(struct gendisk *disk);
	383	extern void rand_initialize_disk(struct gendisk *disk);
	384
	385	static inline sector_t get_start_sect(struct block_device *bdev)
	386	{
	387	return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
	388	}
	389	static inline sector_t get_capacity(struct gendisk *disk)
	390	{
	391	return disk->capacity;
	392	}
	393	static inline void set_capacity(struct gendisk *disk, sector_t size)
	394	{
	395	disk->capacity = size;
	396	}
	397
	398	#endif /* __KERNEL__ */
	399
	400	#ifdef CONFIG_SOLARIS_X86_PARTITION
	401
b84d8796	402	#define SOLARIS_X86_NUMSLICE 16
1da177e4 LT	403	#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
	404
	405	struct solaris_x86_slice {
	406	__le16 s_tag; /* ID tag of partition */
	407	__le16 s_flag; /* permission flags */
	408	__le32 s_start; /* start sector no of partition */
	409	__le32 s_size; /* # of blocks in partition */
	410	};
	411
	412	struct solaris_x86_vtoc {
	413	unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
	414	__le32 v_sanity; /* to verify vtoc sanity */
	415	__le32 v_version; /* layout version */
	416	char v_volume[8]; /* volume name */
	417	__le16 v_sectorsz; /* sector size in bytes */
	418	__le16 v_nparts; /* number of partitions */
	419	unsigned int v_reserved[10]; /* free space */
	420	struct solaris_x86_slice
	421	v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	422	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	423	char v_asciilabel[128]; /* for compatibility */
	424	};
	425
	426	#endif /* CONFIG_SOLARIS_X86_PARTITION */
	427
	428	#ifdef CONFIG_BSD_DISKLABEL
	429	/*
	430	* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
	431	* updated by Marc Espie <Marc.Espie@openbsd.org>
	432	*/
	433
	434	/* check against BSD src/sys/sys/disklabel.h for consistency */
	435
	436	#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
	437	#define BSD_MAXPARTITIONS 16
	438	#define OPENBSD_MAXPARTITIONS 16
	439	#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
	440	struct bsd_disklabel {
	441	__le32 d_magic; /* the magic number */
	442	__s16 d_type; /* drive type */
	443	__s16 d_subtype; /* controller/d_type specific */
	444	char d_typename[16]; /* type name, e.g. "eagle" */
	445	char d_packname[16]; /* pack identifier */
	446	__u32 d_secsize; /* # of bytes per sector */
	447	__u32 d_nsectors; /* # of data sectors per track */
	448	__u32 d_ntracks; /* # of tracks per cylinder */
	449	__u32 d_ncylinders; /* # of data cylinders per unit */
	450	__u32 d_secpercyl; /* # of data sectors per cylinder */
	451	__u32 d_secperunit; /* # of data sectors per unit */
	452	__u16 d_sparespertrack; /* # of spare sectors per track */
	453	__u16 d_sparespercyl; /* # of spare sectors per cylinder */
	454	__u32 d_acylinders; /* # of alt. cylinders per unit */
	455	__u16 d_rpm; /* rotational speed */
	456	__u16 d_interleave; /* hardware sector interleave */
	457	__u16 d_trackskew; /* sector 0 skew, per track */
	458	__u16 d_cylskew; /* sector 0 skew, per cylinder */
	459	__u32 d_headswitch; /* head switch time, usec */
	460	__u32 d_trkseek; /* track-to-track seek, usec */
	461	__u32 d_flags; /* generic flags */
	462	#define NDDATA 5
	463	__u32 d_drivedata[NDDATA]; /* drive-type specific information */
	464	#define NSPARE 5
	465	__u32 d_spare[NSPARE]; /* reserved for future use */
	466	__le32 d_magic2; /* the magic number (again) */
467	__le16 d_checksum; /* xor of data incl. partitions */
468
469	/* filesystem and partition information: */
470	__le16 d_npartitions; /* number of partitions in following */
471	__le32 d_bbsize; /* size of boot area at sn0, bytes */
472	__le32 d_sbsize; /* max size of fs superblock, bytes */
473	struct bsd_partition { /* the partition table */
474	__le32 p_size; /* number of sectors in partition */
475	__le32 p_offset; /* starting sector */
476	__le32 p_fsize; /* filesystem basic fragment size */
477	__u8 p_fstype; /* filesystem type, see below */
478	__u8 p_frag; /* filesystem fragments per block */
479	__le16 p_cpg; /* filesystem cylinders per group */
480	} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
481	};
482
483	#endif /* CONFIG_BSD_DISKLABEL */
484
485	#ifdef CONFIG_UNIXWARE_DISKLABEL
486	/*
487	* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
488	* and Krzysztof G. Baranowski <kgb@knm.org.pl>
489	*/
490
491	#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
492	#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
493	#define UNIXWARE_NUMSLICE 16
494	#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
495
496	struct unixware_slice {
497	__le16 s_label; /* label */
498	__le16 s_flags; /* permission flags */
499	__le32 start_sect; /* starting sector */
500	__le32 nr_sects; /* number of sectors in slice */
501	};
502
503	struct unixware_disklabel {
504	__le32 d_type; /* drive type */
505	__le32 d_magic; /* the magic number */
506	__le32 d_version; /* version number */
507	char d_serial[12]; /* serial number of the device */
508	__le32 d_ncylinders; /* # of data cylinders per device */
509	__le32 d_ntracks; /* # of tracks per cylinder */
510	__le32 d_nsectors; /* # of data sectors per track */
511	__le32 d_secsize; /* # of bytes per sector */
512	__le32 d_part_start; /* # of first sector of this partition */
513	__le32 d_unknown1[12]; /* ? */
514	__le32 d_alt_tbl; /* byte offset of alternate table */
515	__le32 d_alt_len; /* byte length of alternate table */
516	__le32 d_phys_cyl; /* # of physical cylinders per device */
517	__le32 d_phys_trk; /* # of physical tracks per cylinder */
518	__le32 d_phys_sec; /* # of physical sectors per track */
519	__le32 d_phys_bytes; /* # of physical bytes per sector */
520	__le32 d_unknown2; /* ? */
521	__le32 d_unknown3; /* ? */
522	__le32 d_pad[8]; /* pad */
523
524	struct unixware_vtoc {
525	__le32 v_magic; /* the magic number */
526	__le32 v_version; /* version number */
527	char v_name[8]; /* volume name */
528	__le16 v_nslices; /* # of slices */
529	__le16 v_unknown1; /* ? */
530	__le32 v_reserved[10]; /* reserved */
531	struct unixware_slice
532	v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
533	} vtoc;
534
535	}; /* 408 */
536
537	#endif /* CONFIG_UNIXWARE_DISKLABEL */
538
539	#ifdef CONFIG_MINIX_SUBPARTITION
540	# define MINIX_NR_SUBPARTITIONS 4
541	#endif /* CONFIG_MINIX_SUBPARTITION */
542
543	#ifdef __KERNEL__
544
d18d7682 FMDN	545	#define ADDPART_FLAG_NONE 0
	546	#define ADDPART_FLAG_RAID 1
	547	#define ADDPART_FLAG_WHOLEDISK 2
	548
edfaa7c3 KS	549	extern dev_t blk_lookup_devt(const char *name);
edfaa7c3 KS	550	extern char disk_name (struct gendisk hd, int part, char *buf);
1da177e4 LT	551
1da177e4 LT	552	extern int rescan_partitions(struct gendisk disk, struct block_device bdev);
d18d7682	553	extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4	554	extern void delete_partition(struct gendisk *, int);
dd2a345f	555	extern void printk_all_partitions(void);
1da177e4	556
1946089a	557	extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 LT	558	extern struct gendisk *alloc_disk(int minors);
	559	extern struct kobject get_disk(struct gendisk disk);
	560	extern void put_disk(struct gendisk *disk);
edfaa7c3	561	extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4 LT	562	struct module *module,
	563	struct kobject (probe)(dev_t, int , void ),
	564	int (lock)(dev_t, void ),
	565	void *data);
edfaa7c3	566	extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 LT	567
	568	static inline struct block_device bdget_disk(struct gendisk disk, int index)
	569	{
	570	return bdget(MKDEV(disk->major, disk->first_minor) + index);
	571	}
	572
	573	#endif
	574
87c1efbf JA	575	#else /* CONFIG_BLOCK */
	576
	577	static inline void printk_all_partitions(void) { }
	578
edfaa7c3 KS	579	static inline dev_t blk_lookup_devt(const char *name)
	580	{
	581	dev_t devt = MKDEV(0, 0);
	582	return devt;
	583	}
	584
87c1efbf	585	#endif /* CONFIG_BLOCK */
9361401e DH	586
9361401e DH	587	#endif