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Diffstat (limited to 'linux/dev/include/linux/genhd.h')
| -rw-r--r-- | linux/dev/include/linux/genhd.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/linux/dev/include/linux/genhd.h b/linux/dev/include/linux/genhd.h new file mode 100644 index 0000000..20a6c97 --- /dev/null +++ b/linux/dev/include/linux/genhd.h @@ -0,0 +1,141 @@ +#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> + +#define CONFIG_MSDOS_PARTITION 1 + +#ifdef __alpha__ +#define CONFIG_OSF_PARTITION 1 +#endif + +#if defined(__sparc__) || defined(CONFIG_SMD_DISKLABEL) +#define CONFIG_SUN_PARTITION 1 +#endif + +/* These three have identical behaviour; use the second one if DOS fdisk gets + confused about extended/logical partitions starting past cylinder 1023. */ +#define DOS_EXTENDED_PARTITION 5 +#define LINUX_EXTENDED_PARTITION 0x85 +#define WIN98_EXTENDED_PARTITION 0x0f + +#define DM6_PARTITION 0x54 /* has DDO: use xlated geom & offset */ +#define EZD_PARTITION 0x55 /* EZ-DRIVE: same as DM6 (we think) */ +#define DM6_AUX1PARTITION 0x51 /* no DDO: use xlated geom */ +#define DM6_AUX3PARTITION 0x53 /* no DDO: use xlated geom */ + +#ifdef MACH_INCLUDE +struct linux_partition +{ +#else +struct partition { +#endif + 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)); /* Give a polite hint to egcs/alpha to generate + unaligned operations */ + +struct hd_struct { + long start_sect; + long nr_sects; +}; + +struct gendisk { + int major; /* major number of driver */ + const char *major_name; /* name of major driver */ + int minor_shift; /* number of times minor is shifted to + get real minor */ + int max_p; /* maximum partitions per device */ + int max_nr; /* maximum number of real devices */ + + void (*init)(struct gendisk *); /* Initialization called before we do our thing */ + struct hd_struct *part; /* partition table */ + int *sizes; /* device size in blocks, copied to blk_size[] */ + int nr_real; /* number of real devices */ + + void *real_devices; /* internal use */ + struct gendisk *next; +}; + +#ifdef CONFIG_BSD_DISKLABEL +/* + * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> + */ + +#define BSD_PARTITION 0xa5 /* Partition ID */ + +#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ +#define BSD_MAXPARTITIONS 8 +#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ +struct bsd_disklabel { + __u32 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 */ + __u32 d_magic2; /* the magic number (again) */ + __u16 d_checksum; /* xor of data incl. partitions */ + + /* filesystem and partition information: */ + __u16 d_npartitions; /* number of partitions in following */ + __u32 d_bbsize; /* size of boot area at sn0, bytes */ + __u32 d_sbsize; /* max size of fs superblock, bytes */ + struct bsd_partition { /* the partition table */ + __u32 p_size; /* number of sectors in partition */ + __u32 p_offset; /* starting sector */ + __u32 p_fsize; /* filesystem basic fragment size */ + __u8 p_fstype; /* filesystem type, see below */ + __u8 p_frag; /* filesystem fragments per block */ + __u16 p_cpg; /* filesystem cylinders per group */ + } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ +}; + +#endif /* CONFIG_BSD_DISKLABEL */ + +extern struct gendisk *gendisk_head; /* linked list of disks */ + +/* + * disk_name() is used by genhd.c and md.c. + * It formats the devicename of the indicated disk + * into the supplied buffer, and returns a pointer + * to that same buffer (for convenience). + */ +char *disk_name (struct gendisk *hd, int minor, char *buf); + +#endif |