[mirror_ubuntu-zesty-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 */
};

#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 /* !CONFIG_SMP */
#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 /* CONFIG_SMP */

#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;
}

#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 */

#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);
}

#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 /* _LINUX_GENHD_H */
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
34186efc DW	58	#include <linux/major.h>
	59	#include <linux/device.h>
	60	#include <linux/smp.h>
	61	#include <linux/string.h>
	62	#include <linux/fs.h>
8ce7ad7b	63	#include <linux/workqueue.h>
34186efc	64
1da177e4 LT	65	struct partition {
	66	unsigned char boot_ind; /* 0x80 - active */
	67	unsigned char head; /* starting head */
	68	unsigned char sector; /* starting sector */
	69	unsigned char cyl; /* starting cylinder */
	70	unsigned char sys_ind; /* What partition type */
	71	unsigned char end_head; /* end head */
	72	unsigned char end_sector; /* end sector */
	73	unsigned char end_cyl; /* end cylinder */
	74	__le32 start_sect; /* starting sector counting from 0 */
	75	__le32 nr_sects; /* nr of sectors in partition */
	76	} __attribute__((packed));
	77
ea5c48ab JM	78	struct disk_stats {
	79	unsigned long sectors[2]; /* READs and WRITEs */
	80	unsigned long ios[2];
	81	unsigned long merges[2];
	82	unsigned long ticks[2];
	83	unsigned long io_ticks;
	84	unsigned long time_in_queue;
	85	};
	86
1da177e4 LT	87	struct hd_struct {
	88	sector_t start_sect;
	89	sector_t nr_sects;
edfaa7c3	90	struct device dev;
6a4d44c1	91	struct kobject *holder_dir;
1da177e4	92	int policy, partno;
c17bb495 AM	93	#ifdef CONFIG_FAIL_MAKE_REQUEST
c17bb495 AM	94	int make_it_fail;
ea5c48ab JM	95	#endif
	96	unsigned long stamp;
	97	int in_flight;
	98	#ifdef CONFIG_SMP
	99	struct disk_stats *dkstats;
	100	#else
	101	struct disk_stats dkstats;
c17bb495	102	#endif
1da177e4 LT	103	};
	104
	105	#define GENHD_FL_REMOVABLE 1
	106	#define GENHD_FL_DRIVERFS 2
86ce18d7	107	#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4 LT	108	#define GENHD_FL_CD 8
	109	#define GENHD_FL_UP 16
	110	#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
c17bb495	111	#define GENHD_FL_FAIL 64
1da177e4	112
ea5c48ab	113
1da177e4 LT	114	struct gendisk {
	115	int major; /* major number of driver */
	116	int first_minor;
	117	int minors; /* maximum number of minors, =1 for
	118	* disks that can't be partitioned. */
	119	char disk_name[32]; /* name of major driver */
	120	struct hd_struct *part; / [indexed by minor] */
	121	struct block_device_operations *fops;
	122	struct request_queue *queue;
	123	void *private_data;
	124	sector_t capacity;
	125
	126	int flags;
edfaa7c3 KS	127	struct device *driverfs_dev; // FIXME: remove
edfaa7c3 KS	128	struct device dev;
6a4d44c1 JN	129	struct kobject *holder_dir;
6a4d44c1 JN	130	struct kobject *slave_dir;
1da177e4 LT	131
	132	struct timer_rand_state *random;
	133	int policy;
	134
	135	atomic_t sync_io; /* RAID */
20e5c81f	136	unsigned long stamp;
1da177e4 LT	137	int in_flight;
	138	#ifdef CONFIG_SMP
	139	struct disk_stats *dkstats;
	140	#else
	141	struct disk_stats dkstats;
	142	#endif
8ce7ad7b	143	struct work_struct async_notify;
1da177e4 LT	144	};
1da177e4 LT	145
1da177e4 LT	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	*/
ea5c48ab JM	152	static inline struct hd_struct get_part(struct gendisk gendiskp,
	153	sector_t sector)
	154	{
	155	struct hd_struct *part;
	156	int i;
	157	for (i = 0; i < gendiskp->minors - 1; i++) {
	158	part = gendiskp->part[i];
	159	if (part && part->start_sect <= sector
	160	&& sector < part->start_sect + part->nr_sects)
	161	return part;
	162	}
	163	return NULL;
	164	}
	165
1da177e4 LT	166	#ifdef CONFIG_SMP
	167	#define __disk_stat_add(gendiskp, field, addnd) \
	168	(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
	169
	170	#define disk_stat_read(gendiskp, field) \
	171	({ \
	172	typeof(gendiskp->dkstats->field) res = 0; \
	173	int i; \
0a945022	174	for_each_possible_cpu(i) \
1da177e4	175	res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4 LT	176	res; \
	177	})
	178
	179	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	180	int i;
0a945022	181	for_each_possible_cpu(i)
394e3902 AM	182	memset(per_cpu_ptr(gendiskp->dkstats, i), value,
394e3902 AM	183	sizeof (struct disk_stats));
1da177e4	184	}
ea5c48ab JM	185
	186	#define __part_stat_add(part, field, addnd) \
	187	(per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
	188
	189	#define __all_stat_add(gendiskp, field, addnd, sector) \
	190	({ \
	191	struct hd_struct *part = get_part(gendiskp, sector); \
	192	if (part) \
	193	__part_stat_add(part, field, addnd); \
	194	__disk_stat_add(gendiskp, field, addnd); \
	195	})
	196
	197	#define part_stat_read(part, field) \
	198	({ \
	199	typeof(part->dkstats->field) res = 0; \
	200	int i; \
	201	for_each_possible_cpu(i) \
	202	res += per_cpu_ptr(part->dkstats, i)->field; \
	203	res; \
	204	})
	205
	206	static inline void part_stat_set_all(struct hd_struct *part, int value) {
	207	int i;
	208	for_each_possible_cpu(i)
	209	memset(per_cpu_ptr(part->dkstats, i), value,
	210	sizeof(struct disk_stats));
	211	}
1da177e4	212
a8ae50ba	213	#else /* !CONFIG_SMP */
1da177e4 LT	214	#define __disk_stat_add(gendiskp, field, addnd) \
	215	(gendiskp->dkstats.field += addnd)
	216	#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
	217
ea5c48ab JM	218	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
ea5c48ab JM	219	{
1da177e4 LT	220	memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
1da177e4 LT	221	}
ea5c48ab JM	222
	223	#define __part_stat_add(part, field, addnd) \
	224	(part->dkstats.field += addnd)
	225
	226	#define __all_stat_add(gendiskp, field, addnd, sector) \
	227	({ \
	228	struct hd_struct *part = get_part(gendiskp, sector); \
	229	if (part) \
	230	part->dkstats.field += addnd; \
	231	__disk_stat_add(gendiskp, field, addnd); \
	232	})
	233
	234	#define part_stat_read(part, field) (part->dkstats.field)
	235
	236	static inline void part_stat_set_all(struct hd_struct *part, int value)
	237	{
	238	memset(&part->dkstats, value, sizeof(struct disk_stats));
	239	}
	240
a8ae50ba	241	#endif /* CONFIG_SMP */
1da177e4 LT	242
	243	#define disk_stat_add(gendiskp, field, addnd) \
	244	do { \
	245	preempt_disable(); \
	246	__disk_stat_add(gendiskp, field, addnd); \
	247	preempt_enable(); \
	248	} while (0)
	249
	250	#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
	251	#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
	252
	253	#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
	254	#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
	255
	256	#define __disk_stat_sub(gendiskp, field, subnd) \
	257	__disk_stat_add(gendiskp, field, -subnd)
	258	#define disk_stat_sub(gendiskp, field, subnd) \
	259	disk_stat_add(gendiskp, field, -subnd)
	260
ea5c48ab JM	261	#define part_stat_add(gendiskp, field, addnd) \
	262	do { \
	263	preempt_disable(); \
	264	__part_stat_add(gendiskp, field, addnd);\
	265	preempt_enable(); \
	266	} while (0)
	267
	268	#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
	269	#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
	270
	271	#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
	272	#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
	273
	274	#define __part_stat_sub(gendiskp, field, subnd) \
	275	__part_stat_add(gendiskp, field, -subnd)
	276	#define part_stat_sub(gendiskp, field, subnd) \
	277	part_stat_add(gendiskp, field, -subnd)
	278
	279	#define all_stat_add(gendiskp, field, addnd, sector) \
	280	do { \
	281	preempt_disable(); \
	282	__all_stat_add(gendiskp, field, addnd, sector); \
	283	preempt_enable(); \
	284	} while (0)
	285
	286	#define __all_stat_dec(gendiskp, field, sector) \
	287	__all_stat_add(gendiskp, field, -1, sector)
	288	#define all_stat_dec(gendiskp, field, sector) \
	289	all_stat_add(gendiskp, field, -1, sector)
	290
	291	#define __all_stat_inc(gendiskp, field, sector) \
	292	__all_stat_add(gendiskp, field, 1, sector)
	293	#define all_stat_inc(gendiskp, field, sector) \
	294	all_stat_add(gendiskp, field, 1, sector)
	295
	296	#define __all_stat_sub(gendiskp, field, subnd, sector) \
	297	__all_stat_add(gendiskp, field, -subnd, sector)
	298	#define all_stat_sub(gendiskp, field, subnd, sector) \
	299	all_stat_add(gendiskp, field, -subnd, sector)
1da177e4 LT	300
	301	/* Inlines to alloc and free disk stats in struct gendisk */
	302	#ifdef CONFIG_SMP
	303	static inline int init_disk_stats(struct gendisk *disk)
	304	{
	305	disk->dkstats = alloc_percpu(struct disk_stats);
	306	if (!disk->dkstats)
	307	return 0;
	308	return 1;
	309	}
	310
	311	static inline void free_disk_stats(struct gendisk *disk)
	312	{
	313	free_percpu(disk->dkstats);
	314	}
ea5c48ab JM	315
	316	static inline int init_part_stats(struct hd_struct *part)
	317	{
	318	part->dkstats = alloc_percpu(struct disk_stats);
	319	if (!part->dkstats)
	320	return 0;
	321	return 1;
	322	}
	323
	324	static inline void free_part_stats(struct hd_struct *part)
	325	{
	326	free_percpu(part->dkstats);
	327	}
	328
1da177e4 LT	329	#else /* CONFIG_SMP */
	330	static inline int init_disk_stats(struct gendisk *disk)
	331	{
	332	return 1;
	333	}
	334
	335	static inline void free_disk_stats(struct gendisk *disk)
	336	{
	337	}
ea5c48ab JM	338
	339	static inline int init_part_stats(struct hd_struct *part)
	340	{
	341	return 1;
	342	}
	343
	344	static inline void free_part_stats(struct hd_struct *part)
	345	{
	346	}
1da177e4 LT	347	#endif /* CONFIG_SMP */
	348
	349	/* drivers/block/ll_rw_blk.c */
	350	extern void disk_round_stats(struct gendisk *disk);
6f2576af	351	extern void part_round_stats(struct hd_struct *part);
1da177e4 LT	352
1da177e4 LT	353	/* drivers/block/genhd.c */
ac20427e	354	extern int get_blkdev_list(char *, int);
1da177e4 LT	355	extern void add_disk(struct gendisk *disk);
	356	extern void del_gendisk(struct gendisk *gp);
	357	extern void unlink_gendisk(struct gendisk *gp);
	358	extern struct gendisk get_gendisk(dev_t dev, int part);
	359
	360	extern void set_device_ro(struct block_device *bdev, int flag);
	361	extern void set_disk_ro(struct gendisk *disk, int flag);
	362
	363	/* drivers/char/random.c */
	364	extern void add_disk_randomness(struct gendisk *disk);
	365	extern void rand_initialize_disk(struct gendisk *disk);
	366
	367	static inline sector_t get_start_sect(struct block_device *bdev)
	368	{
	369	return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
	370	}
	371	static inline sector_t get_capacity(struct gendisk *disk)
	372	{
	373	return disk->capacity;
	374	}
	375	static inline void set_capacity(struct gendisk *disk, sector_t size)
	376	{
	377	disk->capacity = size;
	378	}
	379
1da177e4 LT	380	#ifdef CONFIG_SOLARIS_X86_PARTITION
1da177e4 LT	381
b84d8796	382	#define SOLARIS_X86_NUMSLICE 16
1da177e4 LT	383	#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
	384
	385	struct solaris_x86_slice {
	386	__le16 s_tag; /* ID tag of partition */
	387	__le16 s_flag; /* permission flags */
	388	__le32 s_start; /* start sector no of partition */
	389	__le32 s_size; /* # of blocks in partition */
	390	};
	391
	392	struct solaris_x86_vtoc {
	393	unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
	394	__le32 v_sanity; /* to verify vtoc sanity */
	395	__le32 v_version; /* layout version */
	396	char v_volume[8]; /* volume name */
	397	__le16 v_sectorsz; /* sector size in bytes */
	398	__le16 v_nparts; /* number of partitions */
	399	unsigned int v_reserved[10]; /* free space */
	400	struct solaris_x86_slice
	401	v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	402	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	403	char v_asciilabel[128]; /* for compatibility */
	404	};
	405
	406	#endif /* CONFIG_SOLARIS_X86_PARTITION */
	407
	408	#ifdef CONFIG_BSD_DISKLABEL
	409	/*
	410	* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
	411	* updated by Marc Espie <Marc.Espie@openbsd.org>
	412	*/
	413
	414	/* check against BSD src/sys/sys/disklabel.h for consistency */
	415
	416	#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
	417	#define BSD_MAXPARTITIONS 16
	418	#define OPENBSD_MAXPARTITIONS 16
	419	#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
	420	struct bsd_disklabel {
	421	__le32 d_magic; /* the magic number */
	422	__s16 d_type; /* drive type */
	423	__s16 d_subtype; /* controller/d_type specific */
	424	char d_typename[16]; /* type name, e.g. "eagle" */
	425	char d_packname[16]; /* pack identifier */
	426	__u32 d_secsize; /* # of bytes per sector */
	427	__u32 d_nsectors; /* # of data sectors per track */
	428	__u32 d_ntracks; /* # of tracks per cylinder */
	429	__u32 d_ncylinders; /* # of data cylinders per unit */
	430	__u32 d_secpercyl; /* # of data sectors per cylinder */
	431	__u32 d_secperunit; /* # of data sectors per unit */
	432	__u16 d_sparespertrack; /* # of spare sectors per track */
	433	__u16 d_sparespercyl; /* # of spare sectors per cylinder */
	434	__u32 d_acylinders; /* # of alt. cylinders per unit */
	435	__u16 d_rpm; /* rotational speed */
	436	__u16 d_interleave; /* hardware sector interleave */
	437	__u16 d_trackskew; /* sector 0 skew, per track */
	438	__u16 d_cylskew; /* sector 0 skew, per cylinder */
	439	__u32 d_headswitch; /* head switch time, usec */
	440	__u32 d_trkseek; /* track-to-track seek, usec */
	441	__u32 d_flags; /* generic flags */
	442	#define NDDATA 5
	443	__u32 d_drivedata[NDDATA]; /* drive-type specific information */
	444	#define NSPARE 5
	445	__u32 d_spare[NSPARE]; /* reserved for future use */
	446	__le32 d_magic2; /* the magic number (again) */
447	__le16 d_checksum; /* xor of data incl. partitions */
448
449	/* filesystem and partition information: */
450	__le16 d_npartitions; /* number of partitions in following */
451	__le32 d_bbsize; /* size of boot area at sn0, bytes */
452	__le32 d_sbsize; /* max size of fs superblock, bytes */
453	struct bsd_partition { /* the partition table */
454	__le32 p_size; /* number of sectors in partition */
455	__le32 p_offset; /* starting sector */
456	__le32 p_fsize; /* filesystem basic fragment size */
457	__u8 p_fstype; /* filesystem type, see below */
458	__u8 p_frag; /* filesystem fragments per block */
459	__le16 p_cpg; /* filesystem cylinders per group */
460	} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
461	};
462
463	#endif /* CONFIG_BSD_DISKLABEL */
464
465	#ifdef CONFIG_UNIXWARE_DISKLABEL
466	/*
467	* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
468	* and Krzysztof G. Baranowski <kgb@knm.org.pl>
469	*/
470
471	#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
472	#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
473	#define UNIXWARE_NUMSLICE 16
474	#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
475
476	struct unixware_slice {
477	__le16 s_label; /* label */
478	__le16 s_flags; /* permission flags */
479	__le32 start_sect; /* starting sector */
480	__le32 nr_sects; /* number of sectors in slice */
481	};
482
483	struct unixware_disklabel {
484	__le32 d_type; /* drive type */
485	__le32 d_magic; /* the magic number */
486	__le32 d_version; /* version number */
487	char d_serial[12]; /* serial number of the device */
488	__le32 d_ncylinders; /* # of data cylinders per device */
489	__le32 d_ntracks; /* # of tracks per cylinder */
490	__le32 d_nsectors; /* # of data sectors per track */
491	__le32 d_secsize; /* # of bytes per sector */
492	__le32 d_part_start; /* # of first sector of this partition */
493	__le32 d_unknown1[12]; /* ? */
494	__le32 d_alt_tbl; /* byte offset of alternate table */
495	__le32 d_alt_len; /* byte length of alternate table */
496	__le32 d_phys_cyl; /* # of physical cylinders per device */
497	__le32 d_phys_trk; /* # of physical tracks per cylinder */
498	__le32 d_phys_sec; /* # of physical sectors per track */
499	__le32 d_phys_bytes; /* # of physical bytes per sector */
500	__le32 d_unknown2; /* ? */
501	__le32 d_unknown3; /* ? */
502	__le32 d_pad[8]; /* pad */
503
504	struct unixware_vtoc {
505	__le32 v_magic; /* the magic number */
506	__le32 v_version; /* version number */
507	char v_name[8]; /* volume name */
508	__le16 v_nslices; /* # of slices */
509	__le16 v_unknown1; /* ? */
510	__le32 v_reserved[10]; /* reserved */
511	struct unixware_slice
512	v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
513	} vtoc;
514
515	}; /* 408 */
516
517	#endif /* CONFIG_UNIXWARE_DISKLABEL */
518
519	#ifdef CONFIG_MINIX_SUBPARTITION
520	# define MINIX_NR_SUBPARTITIONS 4
521	#endif /* CONFIG_MINIX_SUBPARTITION */
522
d18d7682 FMDN	523	#define ADDPART_FLAG_NONE 0
	524	#define ADDPART_FLAG_RAID 1
	525	#define ADDPART_FLAG_WHOLEDISK 2
	526
edfaa7c3 KS	527	extern dev_t blk_lookup_devt(const char *name);
edfaa7c3 KS	528	extern char disk_name (struct gendisk hd, int part, char *buf);
1da177e4 LT	529
1da177e4 LT	530	extern int rescan_partitions(struct gendisk disk, struct block_device bdev);
d18d7682	531	extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4	532	extern void delete_partition(struct gendisk *, int);
dd2a345f	533	extern void printk_all_partitions(void);
1da177e4	534
1946089a	535	extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 LT	536	extern struct gendisk *alloc_disk(int minors);
	537	extern struct kobject get_disk(struct gendisk disk);
	538	extern void put_disk(struct gendisk *disk);
edfaa7c3	539	extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4 LT	540	struct module *module,
	541	struct kobject (probe)(dev_t, int , void ),
	542	int (lock)(dev_t, void ),
	543	void *data);
edfaa7c3	544	extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 LT	545
	546	static inline struct block_device bdget_disk(struct gendisk disk, int index)
	547	{
	548	return bdget(MKDEV(disk->major, disk->first_minor) + index);
	549	}
	550
87c1efbf JA	551	#else /* CONFIG_BLOCK */
	552
	553	static inline void printk_all_partitions(void) { }
	554
edfaa7c3 KS	555	static inline dev_t blk_lookup_devt(const char *name)
	556	{
	557	dev_t devt = MKDEV(0, 0);
	558	return devt;
	559	}
	560
87c1efbf	561	#endif /* CONFIG_BLOCK */
9361401e	562
a8ae50ba	563	#endif /* _LINUX_GENHD_H */