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jcastillo |
#ifndef _LINUX_GENHD_H
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#define _LINUX_GENHD_H
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/*
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* genhd.h Copyright (C) 1992 Drew Eckhardt
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* Generic hard disk header file by
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* Drew Eckhardt
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*
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* <drew@colorado.edu>
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*/
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#include <linux/config.h>
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#define CONFIG_MSDOS_PARTITION 1
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#ifdef __alpha__
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#define CONFIG_OSF_PARTITION 1
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#endif
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#if defined(__sparc__) || defined(CONFIG_SMD_DISKLABEL)
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#define CONFIG_SUN_PARTITION 1
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#endif
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/* These three have identical behaviour; use the second one if DOS fdisk gets
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confused about extended/logical partitions starting past cylinder 1023. */
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#define DOS_EXTENDED_PARTITION 5
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#define LINUX_EXTENDED_PARTITION 0x85
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#define WIN98_EXTENDED_PARTITION 0x0f
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#define DM6_PARTITION 0x54 /* has DDO: use xlated geom & offset */
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#define EZD_PARTITION 0x55 /* EZ-DRIVE: same as DM6 (we think) */
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#define DM6_AUX1PARTITION 0x51 /* no DDO: use xlated geom */
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#define DM6_AUX3PARTITION 0x53 /* no DDO: use xlated geom */
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struct partition {
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unsigned char boot_ind; /* 0x80 - active */
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unsigned char head; /* starting head */
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unsigned char sector; /* starting sector */
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unsigned char cyl; /* starting cylinder */
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unsigned char sys_ind; /* What partition type */
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unsigned char end_head; /* end head */
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unsigned char end_sector; /* end sector */
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unsigned char end_cyl; /* end cylinder */
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unsigned int start_sect; /* starting sector counting from 0 */
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unsigned int nr_sects; /* nr of sectors in partition */
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} __attribute((packed)); /* Give a polite hint to egcs/alpha to generate
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unaligned operations */
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struct hd_struct {
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long start_sect;
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long nr_sects;
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};
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struct gendisk {
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int major; /* major number of driver */
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const char *major_name; /* name of major driver */
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int minor_shift; /* number of times minor is shifted to
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get real minor */
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int max_p; /* maximum partitions per device */
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int max_nr; /* maximum number of real devices */
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void (*init)(struct gendisk *); /* Initialization called before we do our thing */
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struct hd_struct *part; /* partition table */
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int *sizes; /* device size in blocks, copied to blk_size[] */
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int nr_real; /* number of real devices */
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void *real_devices; /* internal use */
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struct gendisk *next;
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};
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#ifdef CONFIG_BSD_DISKLABEL
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/*
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* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
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*/
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#define BSD_PARTITION 0xa5 /* Partition ID */
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#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
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#define BSD_MAXPARTITIONS 8
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#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
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struct bsd_disklabel {
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__u32 d_magic; /* the magic number */
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__s16 d_type; /* drive type */
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__s16 d_subtype; /* controller/d_type specific */
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char d_typename[16]; /* type name, e.g. "eagle" */
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char d_packname[16]; /* pack identifier */
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__u32 d_secsize; /* # of bytes per sector */
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__u32 d_nsectors; /* # of data sectors per track */
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__u32 d_ntracks; /* # of tracks per cylinder */
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__u32 d_ncylinders; /* # of data cylinders per unit */
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__u32 d_secpercyl; /* # of data sectors per cylinder */
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__u32 d_secperunit; /* # of data sectors per unit */
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__u16 d_sparespertrack; /* # of spare sectors per track */
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__u16 d_sparespercyl; /* # of spare sectors per cylinder */
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__u32 d_acylinders; /* # of alt. cylinders per unit */
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__u16 d_rpm; /* rotational speed */
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__u16 d_interleave; /* hardware sector interleave */
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__u16 d_trackskew; /* sector 0 skew, per track */
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__u16 d_cylskew; /* sector 0 skew, per cylinder */
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__u32 d_headswitch; /* head switch time, usec */
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__u32 d_trkseek; /* track-to-track seek, usec */
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__u32 d_flags; /* generic flags */
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#define NDDATA 5
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__u32 d_drivedata[NDDATA]; /* drive-type specific information */
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#define NSPARE 5
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__u32 d_spare[NSPARE]; /* reserved for future use */
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__u32 d_magic2; /* the magic number (again) */
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__u16 d_checksum; /* xor of data incl. partitions */
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/* filesystem and partition information: */
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__u16 d_npartitions; /* number of partitions in following */
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__u32 d_bbsize; /* size of boot area at sn0, bytes */
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__u32 d_sbsize; /* max size of fs superblock, bytes */
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struct bsd_partition { /* the partition table */
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__u32 p_size; /* number of sectors in partition */
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__u32 p_offset; /* starting sector */
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__u32 p_fsize; /* filesystem basic fragment size */
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__u8 p_fstype; /* filesystem type, see below */
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__u8 p_frag; /* filesystem fragments per block */
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__u16 p_cpg; /* filesystem cylinders per group */
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} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
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};
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#endif /* CONFIG_BSD_DISKLABEL */
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extern struct gendisk *gendisk_head; /* linked list of disks */
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/*
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* disk_name() is used by genhd.c and md.c.
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* It formats the devicename of the indicated disk
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* into the supplied buffer, and returns a pointer
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* to that same buffer (for convenience).
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*/
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char *disk_name (struct gendisk *hd, int minor, char *buf);
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#endif
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