[linux-2.6-block.git] / include / linux / genhd.h

#ifndef _LINUX_GENHD_H
#define _LINUX_GENHD_H

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

#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/rcupdate.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, part0.__dev)
#define dev_to_part(device)	container_of((device), struct hd_struct, __dev)
#define disk_to_dev(disk)	(&(disk)->part0.__dev)
#define part_to_dev(part)	(&((part)->__dev))

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 */
};

#define DISK_MAX_PARTS			256
#define DISK_NAME_LEN			32

#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
	struct rcu_head rcu_head;
};

#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_EXT_DEVT			64 /* allow extended devt */

#define BLK_SCSI_MAX_CMDS	(256)
#define BLK_SCSI_CMD_PER_LONG	(BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))

struct blk_scsi_cmd_filter {
	unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
	unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
	struct kobject kobj;
};

struct disk_part_tbl {
	struct rcu_head rcu_head;
	int len;
	struct hd_struct *part[];
};

struct gendisk {
	/* major, first_minor and minors are input parameters only,
	 * don't use directly.  Use disk_devt() and disk_max_parts().
	 */
	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[DISK_NAME_LEN];	/* name of major driver */

	/* Array of pointers to partitions indexed by partno.
	 * Protected with matching bdev lock but stat and other
	 * non-critical accesses use RCU.  Always access through
	 * helpers.
	 */
	struct disk_part_tbl *part_tbl;
	struct hd_struct part0;

	struct block_device_operations *fops;
	struct request_queue *queue;
	void *private_data;

	int flags;
	struct device *driverfs_dev;  // FIXME: remove
	struct kobject *slave_dir;

	struct timer_rand_state *random;

	atomic_t sync_io;		/* RAID */
	struct work_struct async_notify;
#ifdef  CONFIG_BLK_DEV_INTEGRITY
	struct blk_integrity *integrity;
#endif
	int node_id;
};

static inline struct gendisk *part_to_disk(struct hd_struct *part)
{
	if (likely(part)) {
		if (part->partno)
			return dev_to_disk(part_to_dev(part)->parent);
		else
			return dev_to_disk(part_to_dev(part));
	}
	return NULL;
}

static inline int disk_max_parts(struct gendisk *disk)
{
	if (disk->flags & GENHD_FL_EXT_DEVT)
		return DISK_MAX_PARTS;
	return disk->minors;
}

static inline bool disk_partitionable(struct gendisk *disk)
{
	return disk_max_parts(disk) > 1;
}

static inline dev_t disk_devt(struct gendisk *disk)
{
	return disk_to_dev(disk)->devt;
}

static inline dev_t part_devt(struct hd_struct *part)
{
	return part_to_dev(part)->devt;
}

extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);

static inline void disk_put_part(struct hd_struct *part)
{
	if (likely(part))
		put_device(part_to_dev(part));
}

/*
 * Smarter partition iterator without context limits.
 */
#define DISK_PITER_REVERSE	(1 << 0) /* iterate in the reverse direction */
#define DISK_PITER_INCL_EMPTY	(1 << 1) /* include 0-sized parts */
#define DISK_PITER_INCL_PART0	(1 << 2) /* include partition 0 */

struct disk_part_iter {
	struct gendisk		*disk;
	struct hd_struct	*part;
	int			idx;
	unsigned int		flags;
};

extern void disk_part_iter_init(struct disk_part_iter *piter,
				 struct gendisk *disk, unsigned int flags);
extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
extern void disk_part_iter_exit(struct disk_part_iter *piter);

extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
					     sector_t sector);

/*
 * Macros to operate on percpu disk statistics:
 *
 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
 * and should be called between disk_stat_lock() and
 * disk_stat_unlock().
 *
 * part_stat_read() can be called at any time.
 *
 * part_stat_{add|set_all}() and {init|free}_part_stats are for
 * internal use only.
 */
#ifdef	CONFIG_SMP
#define part_stat_lock()	({ rcu_read_lock(); get_cpu(); })
#define part_stat_unlock()	do { put_cpu(); rcu_read_unlock(); } while (0)

#define __part_stat_add(cpu, part, field, addnd)			\
	(per_cpu_ptr((part)->dkstats, (cpu))->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));
}

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 */
#define part_stat_lock()	({ rcu_read_lock(); 0; })
#define part_stat_unlock()	rcu_read_unlock()

#define __part_stat_add(cpu, part, field, addnd)				\
	((part)->dkstats.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));
}

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 */

#define part_stat_add(cpu, part, field, addnd)	do {			\
	__part_stat_add((cpu), (part), field, addnd);			\
	if ((part)->partno)						\
		__part_stat_add((cpu), &part_to_disk((part))->part0,	\
				field, addnd);				\
} while (0)

#define part_stat_dec(cpu, gendiskp, field)				\
	part_stat_add(cpu, gendiskp, field, -1)
#define part_stat_inc(cpu, gendiskp, field)				\
	part_stat_add(cpu, gendiskp, field, 1)
#define part_stat_sub(cpu, gendiskp, field, subnd)			\
	part_stat_add(cpu, gendiskp, field, -subnd)

static inline void part_inc_in_flight(struct hd_struct *part)
{
	part->in_flight++;
	if (part->partno)
		part_to_disk(part)->part0.in_flight++;
}

static inline void part_dec_in_flight(struct hd_struct *part)
{
	part->in_flight--;
	if (part->partno)
		part_to_disk(part)->part0.in_flight--;
}

/* drivers/block/ll_rw_blk.c */
extern void part_round_stats(int cpu, 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 *partno);
extern struct block_device *bdget_disk(struct gendisk *disk, int partno);

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

static inline int get_disk_ro(struct gendisk *disk)
{
	return disk->part0.policy;
}

/* 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_part->start_sect;
}
static inline sector_t get_capacity(struct gendisk *disk)
{
	return disk->part0.nr_sects;
}
static inline void set_capacity(struct gendisk *disk, sector_t size)
{
	disk->part0.nr_sects = 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 int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
extern void blk_free_devt(dev_t devt);
extern dev_t blk_lookup_devt(const char *name, int partno);
extern char *disk_name (struct gendisk *hd, int partno, char *buf);

extern int disk_expand_part_tbl(struct gendisk *disk, int target);
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
						     int partno, sector_t start,
						     sector_t len, int flags);
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);

extern ssize_t part_size_show(struct device *dev,
			      struct device_attribute *attr, char *buf);
extern ssize_t part_stat_show(struct device *dev,
			      struct device_attribute *attr, char *buf);
#ifdef CONFIG_FAIL_MAKE_REQUEST
extern ssize_t part_fail_show(struct device *dev,
			      struct device_attribute *attr, char *buf);
extern ssize_t part_fail_store(struct device *dev,
			       struct device_attribute *attr,
			       const char *buf, size_t count);
#endif /* CONFIG_FAIL_MAKE_REQUEST */

#else /* CONFIG_BLOCK */

static inline void printk_all_partitions(void) { }

static inline dev_t blk_lookup_devt(const char *name, int partno)
{
	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>
e71bf0d0	14	#include <linux/rcupdate.h>
1da177e4	15
9361401e DH	16	#ifdef CONFIG_BLOCK
9361401e DH	17
ed9e1982	18	#define kobj_to_dev(k) container_of((k), struct device, kobj)
548b10eb	19	#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
ed9e1982	20	#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
548b10eb	21	#define disk_to_dev(disk) (&(disk)->part0.__dev)
ed9e1982	22	#define part_to_dev(part) (&((part)->__dev))
edfaa7c3	23
edfaa7c3 KS	24	extern struct device_type part_type;
	25	extern struct kobject *block_depr;
	26	extern struct class block_class;
	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
689d6fac	58	#define DISK_MAX_PARTS 256
3e1a7ff8	59	#define DISK_NAME_LEN 32
689d6fac	60
34186efc DW	61	#include <linux/major.h>
	62	#include <linux/device.h>
	63	#include <linux/smp.h>
	64	#include <linux/string.h>
	65	#include <linux/fs.h>
8ce7ad7b	66	#include <linux/workqueue.h>
34186efc	67
1da177e4 LT	68	struct partition {
	69	unsigned char boot_ind; /* 0x80 - active */
	70	unsigned char head; /* starting head */
	71	unsigned char sector; /* starting sector */
	72	unsigned char cyl; /* starting cylinder */
	73	unsigned char sys_ind; /* What partition type */
	74	unsigned char end_head; /* end head */
	75	unsigned char end_sector; /* end sector */
	76	unsigned char end_cyl; /* end cylinder */
	77	__le32 start_sect; /* starting sector counting from 0 */
	78	__le32 nr_sects; /* nr of sectors in partition */
	79	} __attribute__((packed));
	80
ea5c48ab JM	81	struct disk_stats {
	82	unsigned long sectors[2]; /* READs and WRITEs */
	83	unsigned long ios[2];
	84	unsigned long merges[2];
	85	unsigned long ticks[2];
	86	unsigned long io_ticks;
	87	unsigned long time_in_queue;
	88	};
	89
1da177e4 LT	90	struct hd_struct {
	91	sector_t start_sect;
	92	sector_t nr_sects;
ed9e1982	93	struct device __dev;
6a4d44c1	94	struct kobject *holder_dir;
1da177e4	95	int policy, partno;
c17bb495 AM	96	#ifdef CONFIG_FAIL_MAKE_REQUEST
c17bb495 AM	97	int make_it_fail;
ea5c48ab JM	98	#endif
	99	unsigned long stamp;
	100	int in_flight;
	101	#ifdef CONFIG_SMP
	102	struct disk_stats *dkstats;
	103	#else
	104	struct disk_stats dkstats;
c17bb495	105	#endif
e71bf0d0	106	struct rcu_head rcu_head;
1da177e4 LT	107	};
	108
	109	#define GENHD_FL_REMOVABLE 1
	110	#define GENHD_FL_DRIVERFS 2
86ce18d7	111	#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4 LT	112	#define GENHD_FL_CD 8
	113	#define GENHD_FL_UP 16
	114	#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
689d6fac	115	#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
1da177e4	116
540eed56 TH	117	#define BLK_SCSI_MAX_CMDS (256)
	118	#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
	119
	120	struct blk_scsi_cmd_filter {
	121	unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
	122	unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
	123	struct kobject kobj;
	124	};
	125
	126	struct disk_part_tbl {
	127	struct rcu_head rcu_head;
	128	int len;
	129	struct hd_struct *part[];
	130	};
	131
1da177e4	132	struct gendisk {
689d6fac TH	133	/* major, first_minor and minors are input parameters only,
689d6fac TH	134	* don't use directly. Use disk_devt() and disk_max_parts().
f331c029	135	*/
1da177e4 LT	136	int major; /* major number of driver */
	137	int first_minor;
	138	int minors; /* maximum number of minors, =1 for
	139	* disks that can't be partitioned. */
f331c029	140
3e1a7ff8	141	char disk_name[DISK_NAME_LEN]; /* name of major driver */
e71bf0d0	142
b5d0b9df	143	/* Array of pointers to partitions indexed by partno.
e71bf0d0 TH	144	* Protected with matching bdev lock but stat and other
	145	* non-critical accesses use RCU. Always access through
	146	* helpers.
	147	*/
540eed56	148	struct disk_part_tbl *part_tbl;
b5d0b9df	149	struct hd_struct part0;
e71bf0d0	150
1da177e4 LT	151	struct block_device_operations *fops;
	152	struct request_queue *queue;
	153	void *private_data;
1da177e4 LT	154
1da177e4 LT	155	int flags;
edfaa7c3	156	struct device *driverfs_dev; // FIXME: remove
6a4d44c1	157	struct kobject *slave_dir;
1da177e4 LT	158
1da177e4 LT	159	struct timer_rand_state *random;
1da177e4 LT	160
1da177e4 LT	161	atomic_t sync_io; /* RAID */
8ce7ad7b	162	struct work_struct async_notify;
7ba1ba12 MP	163	#ifdef CONFIG_BLK_DEV_INTEGRITY
	164	struct blk_integrity *integrity;
	165	#endif
540eed56	166	int node_id;
1da177e4 LT	167	};
1da177e4 LT	168
310a2c10 TH	169	static inline struct gendisk part_to_disk(struct hd_struct part)
310a2c10 TH	170	{
548b10eb TH	171	if (likely(part)) {
	172	if (part->partno)
	173	return dev_to_disk(part_to_dev(part)->parent);
	174	else
	175	return dev_to_disk(part_to_dev(part));
	176	}
310a2c10 TH	177	return NULL;
	178	}
	179
f331c029 TH	180	static inline int disk_max_parts(struct gendisk *disk)
f331c029 TH	181	{
689d6fac TH	182	if (disk->flags & GENHD_FL_EXT_DEVT)
	183	return DISK_MAX_PARTS;
	184	return disk->minors;
b5d0b9df TH	185	}
	186
	187	static inline bool disk_partitionable(struct gendisk *disk)
	188	{
	189	return disk_max_parts(disk) > 1;
f331c029 TH	190	}
	191
	192	static inline dev_t disk_devt(struct gendisk *disk)
	193	{
ed9e1982	194	return disk_to_dev(disk)->devt;
f331c029 TH	195	}
	196
	197	static inline dev_t part_devt(struct hd_struct *part)
	198	{
ed9e1982	199	return part_to_dev(part)->devt;
f331c029 TH	200	}
f331c029 TH	201
e71bf0d0 TH	202	extern struct hd_struct disk_get_part(struct gendisk disk, int partno);
	203
	204	static inline void disk_put_part(struct hd_struct *part)
	205	{
	206	if (likely(part))
ed9e1982	207	put_device(part_to_dev(part));
e71bf0d0 TH	208	}
	209
	210	/*
	211	* Smarter partition iterator without context limits.
	212	*/
	213	#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
	214	#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df	215	#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
e71bf0d0 TH	216
	217	struct disk_part_iter {
	218	struct gendisk *disk;
	219	struct hd_struct *part;
	220	int idx;
	221	unsigned int flags;
	222	};
	223
	224	extern void disk_part_iter_init(struct disk_part_iter *piter,
	225	struct gendisk *disk, unsigned int flags);
	226	extern struct hd_struct disk_part_iter_next(struct disk_part_iter piter);
	227	extern void disk_part_iter_exit(struct disk_part_iter *piter);
	228
	229	extern struct hd_struct disk_map_sector_rcu(struct gendisk disk,
	230	sector_t sector);
	231
c9959059	232	/*
1da177e4 LT	233	* Macros to operate on percpu disk statistics:
1da177e4 LT	234	*
c9959059 TH	235	* {disk\|part\|all}_stat_{add\|sub\|inc\|dec}() modify the stat counters
	236	* and should be called between disk_stat_lock() and
	237	* disk_stat_unlock().
	238	*
	239	* part_stat_read() can be called at any time.
	240	*
	241	* part_stat_{add\|set_all}() and {init\|free}_part_stats are for
	242	* internal use only.
1da177e4 LT	243	*/
1da177e4 LT	244	#ifdef CONFIG_SMP
074a7aca TH	245	#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
074a7aca TH	246	#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
ea5c48ab	247
074a7aca TH	248	#define __part_stat_add(cpu, part, field, addnd) \
074a7aca TH	249	(per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
ea5c48ab JM	250
	251	#define part_stat_read(part, field) \
	252	({ \
074a7aca	253	typeof((part)->dkstats->field) res = 0; \
ea5c48ab JM	254	int i; \
ea5c48ab JM	255	for_each_possible_cpu(i) \
074a7aca	256	res += per_cpu_ptr((part)->dkstats, i)->field; \
ea5c48ab JM	257	res; \
	258	})
	259
28f13702 JA	260	static inline void part_stat_set_all(struct hd_struct *part, int value)
28f13702 JA	261	{
ea5c48ab	262	int i;
28f13702	263
ea5c48ab JM	264	for_each_possible_cpu(i)
ea5c48ab JM	265	memset(per_cpu_ptr(part->dkstats, i), value,
28f13702	266	sizeof(struct disk_stats));
ea5c48ab	267	}
c9959059	268
074a7aca	269	static inline int init_part_stats(struct hd_struct *part)
ea5c48ab	270	{
074a7aca TH	271	part->dkstats = alloc_percpu(struct disk_stats);
	272	if (!part->dkstats)
	273	return 0;
	274	return 1;
1da177e4	275	}
ea5c48ab	276
074a7aca	277	static inline void free_part_stats(struct hd_struct *part)
ea5c48ab	278	{
074a7aca	279	free_percpu(part->dkstats);
ea5c48ab JM	280	}
ea5c48ab JM	281
074a7aca TH	282	#else /* !CONFIG_SMP */
	283	#define part_stat_lock() ({ rcu_read_lock(); 0; })
	284	#define part_stat_unlock() rcu_read_unlock()
c9959059	285
074a7aca TH	286	#define __part_stat_add(cpu, part, field, addnd) \
074a7aca TH	287	((part)->dkstats.field += addnd)
1da177e4	288
074a7aca	289	#define part_stat_read(part, field) ((part)->dkstats.field)
1da177e4	290
074a7aca	291	static inline void part_stat_set_all(struct hd_struct *part, int value)
1da177e4	292	{
074a7aca	293	memset(&part->dkstats, value, sizeof(struct disk_stats));
1da177e4	294	}
ea5c48ab JM	295
	296	static inline int init_part_stats(struct hd_struct *part)
	297	{
ea5c48ab JM	298	return 1;
	299	}
	300
	301	static inline void free_part_stats(struct hd_struct *part)
	302	{
ea5c48ab JM	303	}
ea5c48ab JM	304
074a7aca	305	#endif /* CONFIG_SMP */
1da177e4	306
074a7aca TH	307	#define part_stat_add(cpu, part, field, addnd) do { \
	308	__part_stat_add((cpu), (part), field, addnd); \
	309	if ((part)->partno) \
	310	__part_stat_add((cpu), &part_to_disk((part))->part0, \
	311	field, addnd); \
	312	} while (0)
ea5c48ab	313
074a7aca TH	314	#define part_stat_dec(cpu, gendiskp, field) \
	315	part_stat_add(cpu, gendiskp, field, -1)
	316	#define part_stat_inc(cpu, gendiskp, field) \
	317	part_stat_add(cpu, gendiskp, field, 1)
	318	#define part_stat_sub(cpu, gendiskp, field, subnd) \
	319	part_stat_add(cpu, gendiskp, field, -subnd)
	320
	321	static inline void part_inc_in_flight(struct hd_struct *part)
ea5c48ab	322	{
074a7aca TH	323	part->in_flight++;
	324	if (part->partno)
	325	part_to_disk(part)->part0.in_flight++;
ea5c48ab JM	326	}
ea5c48ab JM	327
074a7aca	328	static inline void part_dec_in_flight(struct hd_struct *part)
ea5c48ab	329	{
074a7aca TH	330	part->in_flight--;
	331	if (part->partno)
	332	part_to_disk(part)->part0.in_flight--;
ea5c48ab	333	}
1da177e4 LT	334
1da177e4 LT	335	/* drivers/block/ll_rw_blk.c */
c9959059	336	extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4 LT	337
1da177e4 LT	338	/* drivers/block/genhd.c */
ac20427e	339	extern int get_blkdev_list(char *, int);
1da177e4 LT	340	extern void add_disk(struct gendisk *disk);
	341	extern void del_gendisk(struct gendisk *gp);
	342	extern void unlink_gendisk(struct gendisk *gp);
cf771cb5	343	extern struct gendisk get_gendisk(dev_t dev, int partno);
f331c029	344	extern struct block_device bdget_disk(struct gendisk disk, int partno);
1da177e4 LT	345
	346	extern void set_device_ro(struct block_device *bdev, int flag);
	347	extern void set_disk_ro(struct gendisk *disk, int flag);
	348
b7db9956 TH	349	static inline int get_disk_ro(struct gendisk *disk)
	350	{
	351	return disk->part0.policy;
	352	}
	353
1da177e4 LT	354	/* drivers/char/random.c */
	355	extern void add_disk_randomness(struct gendisk *disk);
	356	extern void rand_initialize_disk(struct gendisk *disk);
	357
	358	static inline sector_t get_start_sect(struct block_device *bdev)
	359	{
0762b8bd	360	return bdev->bd_part->start_sect;
1da177e4 LT	361	}
	362	static inline sector_t get_capacity(struct gendisk *disk)
	363	{
80795aef	364	return disk->part0.nr_sects;
1da177e4 LT	365	}
	366	static inline void set_capacity(struct gendisk *disk, sector_t size)
	367	{
80795aef	368	disk->part0.nr_sects = size;
1da177e4 LT	369	}
1da177e4 LT	370
1da177e4 LT	371	#ifdef CONFIG_SOLARIS_X86_PARTITION
1da177e4 LT	372
b84d8796	373	#define SOLARIS_X86_NUMSLICE 16
1da177e4 LT	374	#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
	375
	376	struct solaris_x86_slice {
	377	__le16 s_tag; /* ID tag of partition */
	378	__le16 s_flag; /* permission flags */
	379	__le32 s_start; /* start sector no of partition */
	380	__le32 s_size; /* # of blocks in partition */
	381	};
	382
	383	struct solaris_x86_vtoc {
	384	unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
	385	__le32 v_sanity; /* to verify vtoc sanity */
	386	__le32 v_version; /* layout version */
	387	char v_volume[8]; /* volume name */
	388	__le16 v_sectorsz; /* sector size in bytes */
	389	__le16 v_nparts; /* number of partitions */
	390	unsigned int v_reserved[10]; /* free space */
	391	struct solaris_x86_slice
	392	v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	393	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	394	char v_asciilabel[128]; /* for compatibility */
	395	};
	396
	397	#endif /* CONFIG_SOLARIS_X86_PARTITION */
	398
	399	#ifdef CONFIG_BSD_DISKLABEL
	400	/*
	401	* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
	402	* updated by Marc Espie <Marc.Espie@openbsd.org>
	403	*/
	404
	405	/* check against BSD src/sys/sys/disklabel.h for consistency */
	406
	407	#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
	408	#define BSD_MAXPARTITIONS 16
	409	#define OPENBSD_MAXPARTITIONS 16
	410	#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
	411	struct bsd_disklabel {
	412	__le32 d_magic; /* the magic number */
	413	__s16 d_type; /* drive type */
	414	__s16 d_subtype; /* controller/d_type specific */
	415	char d_typename[16]; /* type name, e.g. "eagle" */
	416	char d_packname[16]; /* pack identifier */
	417	__u32 d_secsize; /* # of bytes per sector */
	418	__u32 d_nsectors; /* # of data sectors per track */
	419	__u32 d_ntracks; /* # of tracks per cylinder */
	420	__u32 d_ncylinders; /* # of data cylinders per unit */
	421	__u32 d_secpercyl; /* # of data sectors per cylinder */
	422	__u32 d_secperunit; /* # of data sectors per unit */
	423	__u16 d_sparespertrack; /* # of spare sectors per track */
	424	__u16 d_sparespercyl; /* # of spare sectors per cylinder */
	425	__u32 d_acylinders; /* # of alt. cylinders per unit */
	426	__u16 d_rpm; /* rotational speed */
	427	__u16 d_interleave; /* hardware sector interleave */
	428	__u16 d_trackskew; /* sector 0 skew, per track */
	429	__u16 d_cylskew; /* sector 0 skew, per cylinder */
	430	__u32 d_headswitch; /* head switch time, usec */
	431	__u32 d_trkseek; /* track-to-track seek, usec */
	432	__u32 d_flags; /* generic flags */
	433	#define NDDATA 5
	434	__u32 d_drivedata[NDDATA]; /* drive-type specific information */
	435	#define NSPARE 5
	436	__u32 d_spare[NSPARE]; /* reserved for future use */
	437	__le32 d_magic2; /* the magic number (again) */
438	__le16 d_checksum; /* xor of data incl. partitions */
439
440	/* filesystem and partition information: */
441	__le16 d_npartitions; /* number of partitions in following */
442	__le32 d_bbsize; /* size of boot area at sn0, bytes */
443	__le32 d_sbsize; /* max size of fs superblock, bytes */
444	struct bsd_partition { /* the partition table */
445	__le32 p_size; /* number of sectors in partition */
446	__le32 p_offset; /* starting sector */
447	__le32 p_fsize; /* filesystem basic fragment size */
448	__u8 p_fstype; /* filesystem type, see below */
449	__u8 p_frag; /* filesystem fragments per block */
450	__le16 p_cpg; /* filesystem cylinders per group */
451	} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
452	};
453
454	#endif /* CONFIG_BSD_DISKLABEL */
455
456	#ifdef CONFIG_UNIXWARE_DISKLABEL
457	/*
458	* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
459	* and Krzysztof G. Baranowski <kgb@knm.org.pl>
460	*/
461
462	#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
463	#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
464	#define UNIXWARE_NUMSLICE 16
465	#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
466
467	struct unixware_slice {
468	__le16 s_label; /* label */
469	__le16 s_flags; /* permission flags */
470	__le32 start_sect; /* starting sector */
471	__le32 nr_sects; /* number of sectors in slice */
472	};
473
474	struct unixware_disklabel {
475	__le32 d_type; /* drive type */
476	__le32 d_magic; /* the magic number */
477	__le32 d_version; /* version number */
478	char d_serial[12]; /* serial number of the device */
479	__le32 d_ncylinders; /* # of data cylinders per device */
480	__le32 d_ntracks; /* # of tracks per cylinder */
481	__le32 d_nsectors; /* # of data sectors per track */
482	__le32 d_secsize; /* # of bytes per sector */
483	__le32 d_part_start; /* # of first sector of this partition */
484	__le32 d_unknown1[12]; /* ? */
485	__le32 d_alt_tbl; /* byte offset of alternate table */
486	__le32 d_alt_len; /* byte length of alternate table */
487	__le32 d_phys_cyl; /* # of physical cylinders per device */
488	__le32 d_phys_trk; /* # of physical tracks per cylinder */
489	__le32 d_phys_sec; /* # of physical sectors per track */
490	__le32 d_phys_bytes; /* # of physical bytes per sector */
491	__le32 d_unknown2; /* ? */
492	__le32 d_unknown3; /* ? */
493	__le32 d_pad[8]; /* pad */
494
495	struct unixware_vtoc {
496	__le32 v_magic; /* the magic number */
497	__le32 v_version; /* version number */
498	char v_name[8]; /* volume name */
499	__le16 v_nslices; /* # of slices */
500	__le16 v_unknown1; /* ? */
501	__le32 v_reserved[10]; /* reserved */
502	struct unixware_slice
503	v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
504	} vtoc;
505
506	}; /* 408 */
507
508	#endif /* CONFIG_UNIXWARE_DISKLABEL */
509
510	#ifdef CONFIG_MINIX_SUBPARTITION
511	# define MINIX_NR_SUBPARTITIONS 4
512	#endif /* CONFIG_MINIX_SUBPARTITION */
513
d18d7682 FMDN	514	#define ADDPART_FLAG_NONE 0
	515	#define ADDPART_FLAG_RAID 1
	516	#define ADDPART_FLAG_WHOLEDISK 2
	517
bcce3de1 TH	518	extern int blk_alloc_devt(struct hd_struct part, dev_t devt);
bcce3de1 TH	519	extern void blk_free_devt(dev_t devt);
cf771cb5 TH	520	extern dev_t blk_lookup_devt(const char *name, int partno);
cf771cb5 TH	521	extern char disk_name (struct gendisk hd, int partno, char *buf);
1da177e4	522
540eed56	523	extern int disk_expand_part_tbl(struct gendisk *disk, int target);
1da177e4	524	extern int rescan_partitions(struct gendisk disk, struct block_device bdev);
ba32929a TH	525	extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
	526	int partno, sector_t start,
	527	sector_t len, int flags);
1da177e4	528	extern void delete_partition(struct gendisk *, int);
dd2a345f	529	extern void printk_all_partitions(void);
1da177e4	530
1946089a	531	extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 LT	532	extern struct gendisk *alloc_disk(int minors);
	533	extern struct kobject get_disk(struct gendisk disk);
	534	extern void put_disk(struct gendisk *disk);
edfaa7c3	535	extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4 LT	536	struct module *module,
	537	struct kobject (probe)(dev_t, int , void ),
	538	int (lock)(dev_t, void ),
	539	void *data);
edfaa7c3	540	extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4	541
e5610521 TH	542	extern ssize_t part_size_show(struct device *dev,
e5610521 TH	543	struct device_attribute attr, char buf);
074a7aca TH	544	extern ssize_t part_stat_show(struct device *dev,
074a7aca TH	545	struct device_attribute attr, char buf);
eddb2e26 TH	546	#ifdef CONFIG_FAIL_MAKE_REQUEST
	547	extern ssize_t part_fail_show(struct device *dev,
	548	struct device_attribute attr, char buf);
	549	extern ssize_t part_fail_store(struct device *dev,
	550	struct device_attribute *attr,
	551	const char *buf, size_t count);
	552	#endif /* CONFIG_FAIL_MAKE_REQUEST */
e5610521	553
87c1efbf JA	554	#else /* CONFIG_BLOCK */
	555
	556	static inline void printk_all_partitions(void) { }
	557
cf771cb5	558	static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3 KS	559	{
	560	dev_t devt = MKDEV(0, 0);
	561	return devt;
	562	}
	563
87c1efbf	564	#endif /* CONFIG_BLOCK */
9361401e	565
a8ae50ba	566	#endif /* _LINUX_GENHD_H */