include/linux/genhd.h

   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
  12 #include <linux/config.h>
  13 #include <linux/types.h>
  14
  15 /* These three have identical behaviour; use the second one if DOS fdisk gets
  16    confused about extended/logical partitions starting past cylinder 1023. */
  17 #define DOS_EXTENDED_PARTITION 5
  18 #define LINUX_EXTENDED_PARTITION 0x85
  19 #define WIN98_EXTENDED_PARTITION 0x0f
  20
  21 #define LINUX_SWAP_PARTITION    0x82
  22
  23 #ifdef CONFIG_SOLARIS_X86_PARTITION
  24 #define SOLARIS_X86_PARTITION   LINUX_SWAP_PARTITION
  25 #endif
  26
  27 #define DM6_PARTITION           0x54    /* has DDO: use xlated geom & offset */
  28 #define EZD_PARTITION           0x55    /* EZ-DRIVE */
  29 #define DM6_AUX1PARTITION       0x51    /* no DDO:  use xlated geom */
  30 #define DM6_AUX3PARTITION       0x53    /* no DDO:  use xlated geom */
  31
  32 struct partition {
  33         unsigned char boot_ind;         /* 0x80 - active */
  34         unsigned char head;             /* starting head */
  35         unsigned char sector;           /* starting sector */
  36         unsigned char cyl;              /* starting cylinder */
  37         unsigned char sys_ind;          /* What partition type */
  38         unsigned char end_head;         /* end head */
  39         unsigned char end_sector;       /* end sector */
  40         unsigned char end_cyl;          /* end cylinder */
  41         unsigned int start_sect;        /* starting sector counting from 0 */
  42         unsigned int nr_sects;          /* nr of sectors in partition */
  43 } __attribute__((packed));
  44
  45 struct hd_struct {
  46         long start_sect;
  47         long nr_sects;
  48 };
  49
  50 struct gendisk {
  51         int major;                      /* major number of driver */
  52         const char *major_name;         /* name of major driver */
  53         int minor_shift;                /* number of times minor is shifted to
  54                                            get real minor */
  55         int max_p;                      /* maximum partitions per device */
  56         int max_nr;                     /* maximum number of real devices */
  57
  58         void (*init)(struct gendisk *); /* Initialization called before we do our thing */
  59         struct hd_struct *part;         /* [indexed by minor] */
  60         int *sizes;                     /* [idem], device size in blocks */
  61         int nr_real;                    /* number of real devices */
  62
  63         void *real_devices;             /* internal use */
  64         struct gendisk *next;
  65 };
  66
  67 #ifdef CONFIG_SOLARIS_X86_PARTITION
  68
  69 #define SOLARIS_X86_NUMSLICE    8
  70 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
  71
  72 struct solaris_x86_slice {
  73         ushort  s_tag;                  /* ID tag of partition */
  74         ushort  s_flag;                 /* permision flags */
  75         daddr_t s_start;                /* start sector no of partition */
  76         long    s_size;                 /* # of blocks in partition */
  77 };
  78
  79 struct solaris_x86_vtoc {
  80                 unsigned long v_bootinfo[3];    /* info needed by mboot (unsupported) */
  81         unsigned long v_sanity;         /* to verify vtoc sanity */
  82         unsigned long v_version;        /* layout version */
  83         char    v_volume[8];            /* volume name */
  84         ushort  v_sectorsz;             /* sector size in bytes */
  85         ushort  v_nparts;               /* number of partitions */
  86         unsigned long v_reserved[10];   /* free space */
  87         struct solaris_x86_slice
  88                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
  89         time_t  timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
  90         char    v_asciilabel[128];      /* for compatibility */
  91 };
  92
  93 #endif /* CONFIG_SOLARIS_X86_PARTITION */
  94
  95 #ifdef CONFIG_BSD_DISKLABEL
  96 /*
  97  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
  98  * updated by Marc Espie <Marc.Espie@openbsd.org>
  99  */
 100 #define FREEBSD_PARTITION       0xa5    /* FreeBSD Partition ID */
 101 #define OPENBSD_PARTITION       0xa6    /* OpenBSD Partition ID */
 102 #define NETBSD_PARTITION        0xa9    /* NetBSD Partition ID */
 103 #define BSDI_PARTITION          0xb7    /* BSDI Partition ID */
 104
 105 /* Ours is not to wonder why.. */
 106 #define BSD_PARTITION           FREEBSD_PARTITION
 107
 108 /* check against BSD src/sys/sys/disklabel.h for consistency */
 109
 110 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 111 #define BSD_MAXPARTITIONS       8
 112 #define OPENBSD_MAXPARTITIONS   16
 113 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 114 struct bsd_disklabel {
 115         __u32   d_magic;                /* the magic number */
 116         __s16   d_type;                 /* drive type */
 117         __s16   d_subtype;              /* controller/d_type specific */
 118         char    d_typename[16];         /* type name, e.g. "eagle" */
 119         char    d_packname[16];                 /* pack identifier */
 120         __u32   d_secsize;              /* # of bytes per sector */
 121         __u32   d_nsectors;             /* # of data sectors per track */
 122         __u32   d_ntracks;              /* # of tracks per cylinder */
 123         __u32   d_ncylinders;           /* # of data cylinders per unit */
 124         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 125         __u32   d_secperunit;           /* # of data sectors per unit */
 126         __u16   d_sparespertrack;       /* # of spare sectors per track */
 127         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 128         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 129         __u16   d_rpm;                  /* rotational speed */
 130         __u16   d_interleave;           /* hardware sector interleave */
 131         __u16   d_trackskew;            /* sector 0 skew, per track */
 132         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 133         __u32   d_headswitch;           /* head switch time, usec */
 134         __u32   d_trkseek;              /* track-to-track seek, usec */
 135         __u32   d_flags;                /* generic flags */
 136 #define NDDATA 5
 137         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 138 #define NSPARE 5
 139         __u32   d_spare[NSPARE];        /* reserved for future use */
 140         __u32   d_magic2;               /* the magic number (again) */
 141         __u16   d_checksum;             /* xor of data incl. partitions */
 142
 143                         /* filesystem and partition information: */
 144         __u16   d_npartitions;          /* number of partitions in following */
 145         __u32   d_bbsize;               /* size of boot area at sn0, bytes */
 146         __u32   d_sbsize;               /* max size of fs superblock, bytes */
 147         struct  bsd_partition {         /* the partition table */
 148                 __u32   p_size;         /* number of sectors in partition */
 149                 __u32   p_offset;       /* starting sector */
 150                 __u32   p_fsize;        /* filesystem basic fragment size */
 151                 __u8    p_fstype;       /* filesystem type, see below */
 152                 __u8    p_frag;         /* filesystem fragments per block */
 153                 __u16   p_cpg;          /* filesystem cylinders per group */
 154         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 155 };
 156
 157 #endif  /* CONFIG_BSD_DISKLABEL */
 158
 159 #ifdef CONFIG_UNIXWARE_DISKLABEL
 160 /*
 161  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 162  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 163  */
 164
 165 #define UNIXWARE_PARTITION     0x63             /* Partition ID, same as */
 166                                                 /* GNU_HURD and SCO Unix */
 167 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 168 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 169 #define UNIXWARE_NUMSLICE      16
 170 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 171
 172 struct unixware_slice {
 173         __u16   s_label;        /* label */
 174         __u16   s_flags;        /* permission flags */
 175         __u32   start_sect;     /* starting sector */
 176         __u32   nr_sects;       /* number of sectors in slice */
 177 };
 178
 179 struct unixware_disklabel {
 180         __u32   d_type;                 /* drive type */
 181         __u32   d_magic;                /* the magic number */
 182         __u32   d_version;              /* version number */
 183         char    d_serial[12];           /* serial number of the device */
 184         __u32   d_ncylinders;           /* # of data cylinders per device */
 185         __u32   d_ntracks;              /* # of tracks per cylinder */
 186         __u32   d_nsectors;             /* # of data sectors per track */
 187         __u32   d_secsize;              /* # of bytes per sector */
 188         __u32   d_part_start;           /* # of first sector of this partition */
 189         __u32   d_unknown1[12];         /* ? */
 190         __u32   d_alt_tbl;              /* byte offset of alternate table */
 191         __u32   d_alt_len;              /* byte length of alternate table */
 192         __u32   d_phys_cyl;             /* # of physical cylinders per device */
 193         __u32   d_phys_trk;             /* # of physical tracks per cylinder */
 194         __u32   d_phys_sec;             /* # of physical sectors per track */
 195         __u32   d_phys_bytes;           /* # of physical bytes per sector */
 196         __u32   d_unknown2;             /* ? */
 197         __u32   d_unknown3;             /* ? */
 198         __u32   d_pad[8];               /* pad */
 199
 200         struct unixware_vtoc {
 201                 __u32   v_magic;                /* the magic number */
 202                 __u32   v_version;              /* version number */
 203                 char    v_name[8];              /* volume name */
 204                 __u16   v_nslices;              /* # of slices */
 205                 __u16   v_unknown1;             /* ? */
 206                 __u32   v_reserved[10];         /* reserved */
 207                 struct unixware_slice
 208                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 209         } vtoc;
 210
 211 };  /* 408 */
 212
 213 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 214
 215 #ifdef __KERNEL__
 216 extern struct gendisk *gendisk_head;    /* linked list of disks */
 217
 218 char *disk_name (struct gendisk *hd, int minor, char *buf);
 219
 220 int get_hardsect_size(kdev_t dev);
 221 #endif
 222
 223 #endif