426 строки
14 KiB
C
426 строки
14 KiB
C
#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/config.h>
|
|
#include <linux/types.h>
|
|
#include <linux/major.h>
|
|
#include <linux/device.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/string.h>
|
|
#include <linux/fs.h>
|
|
|
|
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,
|
|
|
|
LINUX_SWAP_PARTITION = 0x82,
|
|
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__
|
|
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 kobject kobj;
|
|
unsigned reads, read_sectors, writes, write_sectors;
|
|
int policy, partno;
|
|
};
|
|
|
|
#define GENHD_FL_REMOVABLE 1
|
|
#define GENHD_FL_DRIVERFS 2
|
|
#define GENHD_FL_CD 8
|
|
#define GENHD_FL_UP 16
|
|
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
|
|
|
|
struct disk_stats {
|
|
unsigned read_sectors, write_sectors;
|
|
unsigned reads, writes;
|
|
unsigned read_merges, write_merges;
|
|
unsigned read_ticks, write_ticks;
|
|
unsigned io_ticks;
|
|
unsigned 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;
|
|
char devfs_name[64]; /* devfs crap */
|
|
int number; /* more of the same */
|
|
struct device *driverfs_dev;
|
|
struct kobject kobj;
|
|
|
|
struct timer_rand_state *random;
|
|
int policy;
|
|
|
|
atomic_t sync_io; /* RAID */
|
|
unsigned long stamp, stamp_idle;
|
|
int in_flight;
|
|
#ifdef CONFIG_SMP
|
|
struct disk_stats *dkstats;
|
|
#else
|
|
struct disk_stats dkstats;
|
|
#endif
|
|
};
|
|
|
|
/* Structure for sysfs attributes on block devices */
|
|
struct disk_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct gendisk *, char *);
|
|
};
|
|
|
|
/*
|
|
* 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 (i=0; i < NR_CPUS; i++) { \
|
|
if (!cpu_possible(i)) \
|
|
continue; \
|
|
res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
|
|
} \
|
|
res; \
|
|
})
|
|
|
|
static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
|
|
int i;
|
|
for (i=0; i < NR_CPUS; i++) {
|
|
if (cpu_possible(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 8
|
|
#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__
|
|
|
|
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);
|
|
extern void delete_partition(struct gendisk *, int);
|
|
|
|
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 dev, 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 dev, 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
|
|
|
|
#endif
|