Release 4.12 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>
#include <linux/slab.h>
#include <linux/percpu-refcount.h>
#include <linux/uuid.h>

#ifdef CONFIG_BLOCK


#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;
};


#define PARTITION_META_INFO_VOLNAMELTH	64
/*
 * Enough for the string representation of any kind of UUID plus NULL.
 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
 */

#define PARTITION_META_INFO_UUIDLTH	(UUID_STRING_LEN + 1)


struct partition_meta_info {
	
char uuid[PARTITION_META_INFO_UUIDLTH];
	
u8 volname[PARTITION_META_INFO_VOLNAMELTH];
};


struct hd_struct {
	
sector_t start_sect;
	/*
         * nr_sects is protected by sequence counter. One might extend a
         * partition while IO is happening to it and update of nr_sects
         * can be non-atomic on 32bit machines with 64bit sector_t.
         */
	
sector_t nr_sects;
	
seqcount_t nr_sects_seq;
	
sector_t alignment_offset;
	
unsigned int discard_alignment;
	
struct device __dev;
	
struct kobject *holder_dir;
	

int policy, partno;
	
struct partition_meta_info *info;
#ifdef CONFIG_FAIL_MAKE_REQUEST
	
int make_it_fail;
#endif
	
unsigned long stamp;
	
atomic_t in_flight[2];
#ifdef	CONFIG_SMP
	
struct disk_stats __percpu *dkstats;
#else
	
struct disk_stats dkstats;
#endif
	
struct percpu_ref ref;
	
struct rcu_head rcu_head;
};


#define GENHD_FL_REMOVABLE			1
/* 2 is unused */

#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 GENHD_FL_NATIVE_CAPACITY		128

#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE	256

#define GENHD_FL_NO_PART_SCAN			512

enum {
	
DISK_EVENT_MEDIA_CHANGE			= 1 << 0, /* media changed */
	
DISK_EVENT_EJECT_REQUEST		= 1 << 1, /* eject requested */
};


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

struct disk_events;
struct badblocks;

#if defined(CONFIG_BLK_DEV_INTEGRITY)


struct blk_integrity {
	
const struct blk_integrity_profile	*profile;
	
unsigned char				flags;
	
unsigned char				tuple_size;
	
unsigned char				interval_exp;
	
unsigned char				tag_size;
};

#endif	/* CONFIG_BLK_DEV_INTEGRITY */


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 */
	
char *(*devnode)(struct gendisk *gd, umode_t *mode);

	
unsigned int events;		/* supported events */
	
unsigned int async_events;	/* async events, subset of all */

	/* 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 __rcu *part_tbl;
	
struct hd_struct part0;

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

	
int flags;
	
struct kobject *slave_dir;

	
struct timer_rand_state *random;
	
atomic_t sync_io;		/* RAID */
	
struct disk_events *ev;
#ifdef  CONFIG_BLK_DEV_INTEGRITY
	
struct kobject integrity_kobj;
#endif	/* CONFIG_BLK_DEV_INTEGRITY */
	
int node_id;
	
struct badblocks *bb;
};



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
53
100.00%
3
100.00%
Total
53
100.00%
3
100.00%



static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
{
	uuid_be_to_bin(uuid_str, (uuid_be *)to);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mimi Zohar
25
83.33%
1
50.00%
Andy Shevchenko
5
16.67%
1
50.00%
Total
30
100.00%
2
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
28
100.00%
4
100.00%
Total
28
100.00%
4
100.00%



static inline bool disk_part_scan_enabled(struct gendisk *disk)
{
	return disk_max_parts(disk) > 1 &&
		!(disk->flags & GENHD_FL_NO_PART_SCAN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
29
100.00%
3
100.00%
Total
29
100.00%
3
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
20
100.00%
2
100.00%
Total
20
100.00%
2
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
20
100.00%
2
100.00%
Total
20
100.00%
2
100.00%

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));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
16
59.26%
2
66.67%
Jerome Marchand
11
40.74%
1
33.33%
Total
27
100.00%
3
100.00%

/*
 * 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 */

#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) 
/* include empty 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;                         \
        unsigned int _cpu;                                              \
        for_each_possible_cpu(_cpu)                                     \
                res += per_cpu_ptr((part)->dkstats, _cpu)->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));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
19
45.24%
1
33.33%
Tejun Heo
13
30.95%
1
33.33%
Jerome Marchand
10
23.81%
1
33.33%
Total
42
100.00%
3
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jerome Marchand
35
100.00%
1
100.00%
Total
35
100.00%
1
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jerome Marchand
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

#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));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
24
77.42%
1
50.00%
Andrew Morton
7
22.58%
1
50.00%
Total
31
100.00%
2
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jerome Marchand
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



static inline void free_part_stats(struct hd_struct *part)
{
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jerome Marchand
11
100.00%
1
100.00%
Total
11
100.00%
1
100.00%

#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, int rw)
{
	atomic_inc(&part->in_flight[rw]);
	if (part->partno)
		atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
28
58.33%
1
25.00%
Nikanth Karthikesan
9
18.75%
1
25.00%
David Shaohua Li
8
16.67%
1
25.00%
Al Viro
3
6.25%
1
25.00%
Total
48
100.00%
4
100.00%



static inline void part_dec_in_flight(struct hd_struct *part, int rw)
{
	atomic_dec(&part->in_flight[rw]);
	if (part->partno)
		atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
31
64.58%
1
33.33%
Nikanth Karthikesan
9
18.75%
1
33.33%
David Shaohua Li
8
16.67%
1
33.33%
Total
48
100.00%
3
100.00%



static inline int part_in_flight(struct hd_struct *part)
{
	return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nikanth Karthikesan
27
77.14%
1
50.00%
David Shaohua Li
8
22.86%
1
50.00%
Total
35
100.00%
2
100.00%



static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
{
	if (disk)
		return kzalloc_node(sizeof(struct partition_meta_info),
				    GFP_KERNEL, disk->node_id);
	return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Will Drewry
46
100.00%
1
100.00%
Total
46
100.00%
1
100.00%



static inline void free_part_info(struct hd_struct *part)
{
	kfree(part->info);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Will Drewry
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

/* block/blk-core.c */
extern void part_round_stats(int cpu, struct hd_struct *part);

/* block/genhd.c */
extern void device_add_disk(struct device *parent, struct gendisk *disk);


static inline void add_disk(struct gendisk *disk)
{
	device_add_disk(NULL, disk);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dan J Williams
19
100.00%
2
100.00%
Total
19
100.00%
2
100.00%

extern void del_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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

extern void disk_block_events(struct gendisk *disk);
extern void disk_unblock_events(struct gendisk *disk);
extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);

/* drivers/char/random.c */
extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
13
68.42%
2
40.00%
Andrew Morton
3
15.79%
2
40.00%
Linus Torvalds
3
15.79%
1
20.00%
Total
19
100.00%
5
100.00%



static inline sector_t get_capacity(struct gendisk *disk)
{
	return disk->part0.nr_sects;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
16
84.21%
1
50.00%
Tejun Heo
3
15.79%
1
50.00%
Total
19
100.00%
2
100.00%



static inline void set_capacity(struct gendisk *disk, sector_t size)
{
	disk->part0.nr_sects = size;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Al Viro
20
86.96%
1
50.00%
Tejun Heo
3
13.04%
1
50.00%
Total
23
100.00%
2
100.00%

#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 int invalidate_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,
						     struct partition_meta_info
						       *info);
extern void __delete_partition(struct percpu_ref *);
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);
extern ssize_t part_inflight_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 */



static inline int hd_ref_init(struct hd_struct *part)
{
	if (percpu_ref_init(&part->ref, __delete_partition, 0,
				GFP_KERNEL))
		return -ENOMEM;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jens Axboe
18
51.43%
1
50.00%
Lei Ming
17
48.57%
1
50.00%
Total
35
100.00%
2
100.00%



static inline void hd_struct_get(struct hd_struct *part)
{
	percpu_ref_get(&part->ref);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jens Axboe
19
95.00%
1
50.00%
Lei Ming
1
5.00%
1
50.00%
Total
20
100.00%
2
100.00%



static inline int hd_struct_try_get(struct hd_struct *part)
{
	return percpu_ref_tryget_live(&part->ref);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jens Axboe
20
95.24%
1
50.00%
Lei Ming
1
4.76%
1
50.00%
Total
21
100.00%
2
100.00%



static inline void hd_struct_put(struct hd_struct *part)
{
	percpu_ref_put(&part->ref);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jens Axboe
17
85.00%
1
50.00%
Lei Ming
3
15.00%
1
50.00%
Total
20
100.00%
2
100.00%



static inline void hd_struct_kill(struct hd_struct *part)
{
	percpu_ref_kill(&part->ref);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lei Ming
15
75.00%
1
50.00%
Jens Axboe
5
25.00%
1
50.00%
Total
20
100.00%
2
100.00%



static inline void hd_free_part(struct hd_struct *part)
{
	free_part_stats(part);
	free_part_info(part);
	percpu_ref_exit(&part->ref);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lei Ming
30
100.00%
2
100.00%
Total
30
100.00%
2
100.00%

/*
 * Any access of part->nr_sects which is not protected by partition
 * bd_mutex or gendisk bdev bd_mutex, should be done using this
 * accessor function.
 *
 * Code written along the lines of i_size_read() and i_size_write().
 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
 * on.
 */


static inline sector_t part_nr_sects_read(struct hd_struct *part)
{
#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
	sector_t nr_sects;
	unsigned seq;
	do {
		seq = read_seqcount_begin(&part->nr_sects_seq);
		nr_sects = part->nr_sects;
	} while (read_seqcount_retry(&part->nr_sects_seq, seq));
	return nr_sects;
#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
	sector_t nr_sects;

	preempt_disable();
	nr_sects = part->nr_sects;
	preempt_enable();
	return nr_sects;
#else
	return part->nr_sects;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vivek Goyal
110
100.00%
1
100.00%
Total
110
100.00%
1
100.00%

/*
 * Should be called with mutex lock held (typically bd_mutex) of partition
 * to provide mutual exlusion among writers otherwise seqcount might be
 * left in wrong state leaving the readers spinning infinitely.
 */


static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
{
#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
	write_seqcount_begin(&part->nr_sects_seq);
	part->nr_sects = size;
	write_seqcount_end(&part->nr_sects_seq);
#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
	preempt_disable();
	part->nr_sects = size;
	preempt_enable();
#else
	part->nr_sects = size;
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vivek Goyal
89
100.00%
1
100.00%
Total
89
100.00%
1
100.00%

#if defined(CONFIG_BLK_DEV_INTEGRITY)
extern void blk_integrity_add(struct gendisk *);
extern void blk_integrity_del(struct gendisk *);
#else	/* CONFIG_BLK_DEV_INTEGRITY */


static inline void blk_integrity_add(struct gendisk *disk) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin K. Petersen
11
100.00%
1
100.00%
Total
11
100.00%
1
100.00%



static inline void blk_integrity_del(struct gendisk *disk) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin K. Petersen
11
100.00%
1
100.00%
Total
11
100.00%
1
100.00%

#endif	/* CONFIG_BLK_DEV_INTEGRITY */

#else /* CONFIG_BLOCK */



static inline void printk_all_partitions(void) { }

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jens Axboe
8
100.00%
1
100.00%
Total
8
100.00%
1
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kay Sievers
27
96.43%
2
66.67%
Tejun Heo
1
3.57%
1
33.33%
Total
28
100.00%
3
100.00%



static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
{
	return -EINVAL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mimi Zohar
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%

#endif /* CONFIG_BLOCK */

#endif /* _LINUX_GENHD_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Tejun Heo
797
26.20%
24
18.05%
Linus Torvalds (pre-git)
510
16.77%
14
10.53%
Al Viro
323
10.62%
26
19.55%
Vivek Goyal
205
6.74%
1
0.75%
Jerome Marchand
195
6.41%
3
2.26%
Jens Axboe
104
3.42%
5
3.76%
Will Drewry
101
3.32%
1
0.75%
Martin K. Petersen
100
3.29%
4
3.01%
Linus Torvalds
100
3.29%
5
3.76%
Kay Sievers
90
2.96%
4
3.01%
Lei Ming
73
2.40%
2
1.50%
Nikanth Karthikesan
67
2.20%
1
0.75%
Andrew Morton
62
2.04%
5
3.76%
Mimi Zohar
45
1.48%
1
0.75%
Christoph Hellwig
42
1.38%
1
0.75%
Dan J Williams
25
0.82%
2
1.50%
Jun'ichi Nomura
25
0.82%
2
1.50%
David Shaohua Li
25
0.82%
1
0.75%
Fabio Massimo Di Nitto
18
0.59%
1
0.75%
Andries E. Brouwer
16
0.53%
2
1.50%
David Woodhouse
16
0.53%
2
1.50%
Christoph Lameter
13
0.43%
1
0.75%
Mike Sullivan
9
0.30%
1
0.75%
Andy Shevchenko
9
0.30%
1
0.75%
Kristen Carlson Accardi
9
0.30%
2
1.50%
Akinobu Mita
8
0.26%
1
0.75%
Olaf Hering
8
0.26%
1
0.75%
Vishal Verma
8
0.26%
1
0.75%
David Alan Gilbert
7
0.23%
1
0.75%
Emese Revfy
6
0.20%
1
0.75%
David Howells
5
0.16%
1
0.75%
Bartlomiej Zolnierkiewicz
4
0.13%
1
0.75%
Arnd Bergmann
3
0.10%
1
0.75%
Neil Brown
2
0.07%
2
1.50%
Petros Koutoupis
2
0.07%
2
1.50%
Stephen Warren
2
0.07%
1
0.75%
Eric Biggers
1
0.03%
1
0.75%
Stephen Hemminger
1
0.03%
1
0.75%
Martin Pool
1
0.03%
1
0.75%
Abdel Benamrouche
1
0.03%
1
0.75%
Ingo Molnar
1
0.03%
1
0.75%
Mark Fortescue
1
0.03%
1
0.75%
Roland McGrath
1
0.03%
1
0.75%
Alexey Dobriyan
1
0.03%
1
0.75%
Total
3042
100.00%
133
100.00%
Directory: include/linux

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.