[net-next-2.6.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 disk_type;
extern struct device_type part_type;
extern struct kobject *block_depr;
extern struct class block_class;

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 hd_struct {
	sector_t start_sect;
	sector_t nr_sects;
	struct device dev;
	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_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 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] */
	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.
 */
#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	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 genhd_media_change_notify(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
	21	extern struct device_type disk_type;
	22	extern struct device_type part_type;
	23	extern struct kobject *block_depr;
	24	extern struct class block_class;
	25
1da177e4 LT	26	enum {
	27	/* These three have identical behaviour; use the second one if DOS FDISK gets
	28	confused about extended/logical partitions starting past cylinder 1023. */
	29	DOS_EXTENDED_PARTITION = 5,
	30	LINUX_EXTENDED_PARTITION = 0x85,
	31	WIN98_EXTENDED_PARTITION = 0x0f,
	32
d18d7682 FMDN	33	SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
d18d7682 FMDN	34
1da177e4	35	LINUX_SWAP_PARTITION = 0x82,
4419d1ac OH	36	LINUX_DATA_PARTITION = 0x83,
4419d1ac OH	37	LINUX_LVM_PARTITION = 0x8e,
1da177e4 LT	38	LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
	39
	40	SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
	41	NEW_SOLARIS_X86_PARTITION = 0xbf,
	42
	43	DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
	44	DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
	45	DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
	46	EZD_PARTITION = 0x55, /* EZ-DRIVE */
	47
	48	FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
	49	OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
	50	NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
	51	BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
	52	MINIX_PARTITION = 0x81, /* Minix Partition ID */
	53	UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
	54	};
	55
	56	#ifndef __KERNEL__
	57
	58	struct partition {
	59	unsigned char boot_ind; /* 0x80 - active */
	60	unsigned char head; /* starting head */
	61	unsigned char sector; /* starting sector */
	62	unsigned char cyl; /* starting cylinder */
	63	unsigned char sys_ind; /* What partition type */
	64	unsigned char end_head; /* end head */
	65	unsigned char end_sector; /* end sector */
	66	unsigned char end_cyl; /* end cylinder */
	67	unsigned int start_sect; /* starting sector counting from 0 */
	68	unsigned int nr_sects; /* nr of sectors in partition */
	69	} __attribute__((packed));
	70
	71	#endif
	72
	73	#ifdef __KERNEL__
34186efc DW	74	#include <linux/major.h>
	75	#include <linux/device.h>
	76	#include <linux/smp.h>
	77	#include <linux/string.h>
	78	#include <linux/fs.h>
8ce7ad7b	79	#include <linux/workqueue.h>
34186efc	80
1da177e4 LT	81	struct partition {
	82	unsigned char boot_ind; /* 0x80 - active */
	83	unsigned char head; /* starting head */
	84	unsigned char sector; /* starting sector */
	85	unsigned char cyl; /* starting cylinder */
	86	unsigned char sys_ind; /* What partition type */
	87	unsigned char end_head; /* end head */
	88	unsigned char end_sector; /* end sector */
	89	unsigned char end_cyl; /* end cylinder */
	90	__le32 start_sect; /* starting sector counting from 0 */
	91	__le32 nr_sects; /* nr of sectors in partition */
	92	} __attribute__((packed));
	93
	94	struct hd_struct {
	95	sector_t start_sect;
	96	sector_t nr_sects;
edfaa7c3	97	struct device dev;
6a4d44c1	98	struct kobject *holder_dir;
47a00410	99	unsigned ios[2], sectors[2]; /* READs and WRITEs */
1da177e4	100	int policy, partno;
c17bb495 AM	101	#ifdef CONFIG_FAIL_MAKE_REQUEST
	102	int make_it_fail;
	103	#endif
1da177e4 LT	104	};
	105
	106	#define GENHD_FL_REMOVABLE 1
	107	#define GENHD_FL_DRIVERFS 2
86ce18d7	108	#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4 LT	109	#define GENHD_FL_CD 8
	110	#define GENHD_FL_UP 16
	111	#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
c17bb495	112	#define GENHD_FL_FAIL 64
1da177e4 LT	113
1da177e4 LT	114	struct disk_stats {
837c7878 BW	115	unsigned long sectors[2]; /* READs and WRITEs */
	116	unsigned long ios[2];
	117	unsigned long merges[2];
	118	unsigned long ticks[2];
	119	unsigned long io_ticks;
	120	unsigned long time_in_queue;
1da177e4 LT	121	};
	122
	123	struct gendisk {
	124	int major; /* major number of driver */
	125	int first_minor;
	126	int minors; /* maximum number of minors, =1 for
	127	* disks that can't be partitioned. */
	128	char disk_name[32]; /* name of major driver */
	129	struct hd_struct *part; / [indexed by minor] */
	130	struct block_device_operations *fops;
	131	struct request_queue *queue;
	132	void *private_data;
	133	sector_t capacity;
	134
	135	int flags;
edfaa7c3 KS	136	struct device *driverfs_dev; // FIXME: remove
edfaa7c3 KS	137	struct device dev;
6a4d44c1 JN	138	struct kobject *holder_dir;
6a4d44c1 JN	139	struct kobject *slave_dir;
1da177e4 LT	140
	141	struct timer_rand_state *random;
	142	int policy;
	143
	144	atomic_t sync_io; /* RAID */
20e5c81f	145	unsigned long stamp;
1da177e4 LT	146	int in_flight;
	147	#ifdef CONFIG_SMP
	148	struct disk_stats *dkstats;
	149	#else
	150	struct disk_stats dkstats;
	151	#endif
8ce7ad7b	152	struct work_struct async_notify;
1da177e4 LT	153	};
1da177e4 LT	154
1da177e4 LT	155	/*
	156	* Macros to operate on percpu disk statistics:
	157	*
	158	* The __ variants should only be called in critical sections. The full
	159	* variants disable/enable preemption.
	160	*/
	161	#ifdef CONFIG_SMP
	162	#define __disk_stat_add(gendiskp, field, addnd) \
	163	(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
	164
	165	#define disk_stat_read(gendiskp, field) \
	166	({ \
	167	typeof(gendiskp->dkstats->field) res = 0; \
	168	int i; \
0a945022	169	for_each_possible_cpu(i) \
1da177e4	170	res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4 LT	171	res; \
	172	})
	173
	174	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	175	int i;
0a945022	176	for_each_possible_cpu(i)
394e3902 AM	177	memset(per_cpu_ptr(gendiskp->dkstats, i), value,
394e3902 AM	178	sizeof (struct disk_stats));
1da177e4 LT	179	}
	180
	181	#else
	182	#define __disk_stat_add(gendiskp, field, addnd) \
	183	(gendiskp->dkstats.field += addnd)
	184	#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
	185
	186	static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
	187	memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
	188	}
	189	#endif
	190
	191	#define disk_stat_add(gendiskp, field, addnd) \
	192	do { \
	193	preempt_disable(); \
	194	__disk_stat_add(gendiskp, field, addnd); \
	195	preempt_enable(); \
	196	} while (0)
	197
	198	#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
	199	#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
	200
	201	#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
	202	#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
	203
	204	#define __disk_stat_sub(gendiskp, field, subnd) \
	205	__disk_stat_add(gendiskp, field, -subnd)
	206	#define disk_stat_sub(gendiskp, field, subnd) \
	207	disk_stat_add(gendiskp, field, -subnd)
	208
	209
	210	/* Inlines to alloc and free disk stats in struct gendisk */
	211	#ifdef CONFIG_SMP
	212	static inline int init_disk_stats(struct gendisk *disk)
	213	{
	214	disk->dkstats = alloc_percpu(struct disk_stats);
	215	if (!disk->dkstats)
	216	return 0;
	217	return 1;
	218	}
	219
	220	static inline void free_disk_stats(struct gendisk *disk)
	221	{
	222	free_percpu(disk->dkstats);
	223	}
	224	#else /* CONFIG_SMP */
	225	static inline int init_disk_stats(struct gendisk *disk)
	226	{
	227	return 1;
	228	}
	229
	230	static inline void free_disk_stats(struct gendisk *disk)
	231	{
	232	}
	233	#endif /* CONFIG_SMP */
	234
	235	/* drivers/block/ll_rw_blk.c */
	236	extern void disk_round_stats(struct gendisk *disk);
	237
	238	/* drivers/block/genhd.c */
ac20427e	239	extern int get_blkdev_list(char *, int);
1da177e4 LT	240	extern void add_disk(struct gendisk *disk);
	241	extern void del_gendisk(struct gendisk *gp);
	242	extern void unlink_gendisk(struct gendisk *gp);
	243	extern struct gendisk get_gendisk(dev_t dev, int part);
	244
	245	extern void set_device_ro(struct block_device *bdev, int flag);
	246	extern void set_disk_ro(struct gendisk *disk, int flag);
	247
	248	/* drivers/char/random.c */
	249	extern void add_disk_randomness(struct gendisk *disk);
	250	extern void rand_initialize_disk(struct gendisk *disk);
	251
	252	static inline sector_t get_start_sect(struct block_device *bdev)
	253	{
	254	return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
	255	}
	256	static inline sector_t get_capacity(struct gendisk *disk)
	257	{
	258	return disk->capacity;
	259	}
	260	static inline void set_capacity(struct gendisk *disk, sector_t size)
	261	{
	262	disk->capacity = size;
	263	}
	264
	265	#endif /* __KERNEL__ */
	266
	267	#ifdef CONFIG_SOLARIS_X86_PARTITION
	268
b84d8796	269	#define SOLARIS_X86_NUMSLICE 16
1da177e4 LT	270	#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
	271
	272	struct solaris_x86_slice {
	273	__le16 s_tag; /* ID tag of partition */
	274	__le16 s_flag; /* permission flags */
	275	__le32 s_start; /* start sector no of partition */
	276	__le32 s_size; /* # of blocks in partition */
	277	};
	278
	279	struct solaris_x86_vtoc {
	280	unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
	281	__le32 v_sanity; /* to verify vtoc sanity */
	282	__le32 v_version; /* layout version */
	283	char v_volume[8]; /* volume name */
	284	__le16 v_sectorsz; /* sector size in bytes */
	285	__le16 v_nparts; /* number of partitions */
	286	unsigned int v_reserved[10]; /* free space */
	287	struct solaris_x86_slice
	288	v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	289	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	290	char v_asciilabel[128]; /* for compatibility */
	291	};
	292
	293	#endif /* CONFIG_SOLARIS_X86_PARTITION */
	294
	295	#ifdef CONFIG_BSD_DISKLABEL
	296	/*
	297	* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
	298	* updated by Marc Espie <Marc.Espie@openbsd.org>
	299	*/
	300
	301	/* check against BSD src/sys/sys/disklabel.h for consistency */
	302
	303	#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
	304	#define BSD_MAXPARTITIONS 16
	305	#define OPENBSD_MAXPARTITIONS 16
	306	#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
	307	struct bsd_disklabel {
	308	__le32 d_magic; /* the magic number */
	309	__s16 d_type; /* drive type */
	310	__s16 d_subtype; /* controller/d_type specific */
	311	char d_typename[16]; /* type name, e.g. "eagle" */
	312	char d_packname[16]; /* pack identifier */
	313	__u32 d_secsize; /* # of bytes per sector */
	314	__u32 d_nsectors; /* # of data sectors per track */
	315	__u32 d_ntracks; /* # of tracks per cylinder */
	316	__u32 d_ncylinders; /* # of data cylinders per unit */
	317	__u32 d_secpercyl; /* # of data sectors per cylinder */
	318	__u32 d_secperunit; /* # of data sectors per unit */
	319	__u16 d_sparespertrack; /* # of spare sectors per track */
	320	__u16 d_sparespercyl; /* # of spare sectors per cylinder */
	321	__u32 d_acylinders; /* # of alt. cylinders per unit */
	322	__u16 d_rpm; /* rotational speed */
	323	__u16 d_interleave; /* hardware sector interleave */
	324	__u16 d_trackskew; /* sector 0 skew, per track */
	325	__u16 d_cylskew; /* sector 0 skew, per cylinder */
	326	__u32 d_headswitch; /* head switch time, usec */
	327	__u32 d_trkseek; /* track-to-track seek, usec */
	328	__u32 d_flags; /* generic flags */
	329	#define NDDATA 5
	330	__u32 d_drivedata[NDDATA]; /* drive-type specific information */
	331	#define NSPARE 5
	332	__u32 d_spare[NSPARE]; /* reserved for future use */
	333	__le32 d_magic2; /* the magic number (again) */
334	__le16 d_checksum; /* xor of data incl. partitions */
335
336	/* filesystem and partition information: */
337	__le16 d_npartitions; /* number of partitions in following */
338	__le32 d_bbsize; /* size of boot area at sn0, bytes */
339	__le32 d_sbsize; /* max size of fs superblock, bytes */
340	struct bsd_partition { /* the partition table */
341	__le32 p_size; /* number of sectors in partition */
342	__le32 p_offset; /* starting sector */
343	__le32 p_fsize; /* filesystem basic fragment size */
344	__u8 p_fstype; /* filesystem type, see below */
345	__u8 p_frag; /* filesystem fragments per block */
346	__le16 p_cpg; /* filesystem cylinders per group */
347	} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
348	};
349
350	#endif /* CONFIG_BSD_DISKLABEL */
351
352	#ifdef CONFIG_UNIXWARE_DISKLABEL
353	/*
354	* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
355	* and Krzysztof G. Baranowski <kgb@knm.org.pl>
356	*/
357
358	#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
359	#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
360	#define UNIXWARE_NUMSLICE 16
361	#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
362
363	struct unixware_slice {
364	__le16 s_label; /* label */
365	__le16 s_flags; /* permission flags */
366	__le32 start_sect; /* starting sector */
367	__le32 nr_sects; /* number of sectors in slice */
368	};
369
370	struct unixware_disklabel {
371	__le32 d_type; /* drive type */
372	__le32 d_magic; /* the magic number */
373	__le32 d_version; /* version number */
374	char d_serial[12]; /* serial number of the device */
375	__le32 d_ncylinders; /* # of data cylinders per device */
376	__le32 d_ntracks; /* # of tracks per cylinder */
377	__le32 d_nsectors; /* # of data sectors per track */
378	__le32 d_secsize; /* # of bytes per sector */
379	__le32 d_part_start; /* # of first sector of this partition */
380	__le32 d_unknown1[12]; /* ? */
381	__le32 d_alt_tbl; /* byte offset of alternate table */
382	__le32 d_alt_len; /* byte length of alternate table */
383	__le32 d_phys_cyl; /* # of physical cylinders per device */
384	__le32 d_phys_trk; /* # of physical tracks per cylinder */
385	__le32 d_phys_sec; /* # of physical sectors per track */
386	__le32 d_phys_bytes; /* # of physical bytes per sector */
387	__le32 d_unknown2; /* ? */
388	__le32 d_unknown3; /* ? */
389	__le32 d_pad[8]; /* pad */
390
391	struct unixware_vtoc {
392	__le32 v_magic; /* the magic number */
393	__le32 v_version; /* version number */
394	char v_name[8]; /* volume name */
395	__le16 v_nslices; /* # of slices */
396	__le16 v_unknown1; /* ? */
397	__le32 v_reserved[10]; /* reserved */
398	struct unixware_slice
399	v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
400	} vtoc;
401
402	}; /* 408 */
403
404	#endif /* CONFIG_UNIXWARE_DISKLABEL */
405
406	#ifdef CONFIG_MINIX_SUBPARTITION
407	# define MINIX_NR_SUBPARTITIONS 4
408	#endif /* CONFIG_MINIX_SUBPARTITION */
409
410	#ifdef __KERNEL__
411
d18d7682 FMDN	412	#define ADDPART_FLAG_NONE 0
	413	#define ADDPART_FLAG_RAID 1
	414	#define ADDPART_FLAG_WHOLEDISK 2
	415
edfaa7c3 KS	416	extern dev_t blk_lookup_devt(const char *name);
edfaa7c3 KS	417	extern char disk_name (struct gendisk hd, int part, char *buf);
1da177e4 LT	418
1da177e4 LT	419	extern int rescan_partitions(struct gendisk disk, struct block_device bdev);
d18d7682	420	extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4	421	extern void delete_partition(struct gendisk *, int);
dd2a345f	422	extern void printk_all_partitions(void);
1da177e4	423
1946089a	424	extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 LT	425	extern struct gendisk *alloc_disk(int minors);
	426	extern struct kobject get_disk(struct gendisk disk);
	427	extern void put_disk(struct gendisk *disk);
8ce7ad7b	428	extern void genhd_media_change_notify(struct gendisk *disk);
edfaa7c3	429	extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4 LT	430	struct module *module,
	431	struct kobject (probe)(dev_t, int , void ),
	432	int (lock)(dev_t, void ),
	433	void *data);
edfaa7c3	434	extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 LT	435
	436	static inline struct block_device bdget_disk(struct gendisk disk, int index)
	437	{
	438	return bdget(MKDEV(disk->major, disk->first_minor) + index);
	439	}
	440
	441	#endif
	442
87c1efbf JA	443	#else /* CONFIG_BLOCK */
	444
	445	static inline void printk_all_partitions(void) { }
	446
edfaa7c3 KS	447	static inline dev_t blk_lookup_devt(const char *name)
	448	{
	449	dev_t devt = MKDEV(0, 0);
	450	return devt;
	451	}
	452
87c1efbf	453	#endif /* CONFIG_BLOCK */
9361401e DH	454
9361401e DH	455	#endif