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 #define CONFIG_MSDOS_PARTITION 1
  16
  17 #ifdef __alpha__
  18 #define CONFIG_OSF_PARTITION 1
  19 #endif
  20
  21 #if defined(__sparc__) || defined(CONFIG_SMD_DISKLABEL)
  22 #define CONFIG_SUN_PARTITION 1
  23 #endif
  24
  25 #if defined(CONFIG_SGI) || defined(CONFIG_SGI_DISKLABEL)
  26 #define CONFIG_SGI_PARTITION 1
  27 #endif
  28
  29 /* These three have identical behaviour; use the second one if DOS fdisk gets
  30    confused about extended/logical partitions starting past cylinder 1023. */
  31 #define DOS_EXTENDED_PARTITION 5
  32 #define LINUX_EXTENDED_PARTITION 0x85
  33 #define WIN98_EXTENDED_PARTITION 0x0f
  34
  35 #define LINUX_SWAP_PARTITION    0x82
  36
  37 #ifdef CONFIG_SOLARIS_X86_PARTITION
  38 #define SOLARIS_X86_PARTITION   LINUX_SWAP_PARTITION
  39 #endif
  40
  41 #define DM6_PARTITION           0x54    /* has DDO: use xlated geom & offset */
  42 #define EZD_PARTITION           0x55    /* EZ-DRIVE */
  43 #define DM6_AUX1PARTITION       0x51    /* no DDO:  use xlated geom */
  44 #define DM6_AUX3PARTITION       0x53    /* no DDO:  use xlated geom */
  45
  46 struct partition {
  47         unsigned char boot_ind;         /* 0x80 - active */
  48         unsigned char head;             /* starting head */
  49         unsigned char sector;           /* starting sector */
  50         unsigned char cyl;              /* starting cylinder */
  51         unsigned char sys_ind;          /* What partition type */
  52         unsigned char end_head;         /* end head */
  53         unsigned char end_sector;       /* end sector */
  54         unsigned char end_cyl;          /* end cylinder */
  55         unsigned int start_sect;        /* starting sector counting from 0 */
  56         unsigned int nr_sects;          /* nr of sectors in partition */
  57 } __attribute__((packed));
  58
  59 struct hd_struct {
  60         long start_sect;
  61         long nr_sects;
  62 };
  63
  64 struct gendisk {
  65         int major;                      /* major number of driver */
  66         const char *major_name;         /* name of major driver */
  67         int minor_shift;                /* number of times minor is shifted to
  68                                            get real minor */
  69         int max_p;                      /* maximum partitions per device */
  70         int max_nr;                     /* maximum number of real devices */
  71
  72         void (*init)(struct gendisk *); /* Initialization called before we do our thing */
  73         struct hd_struct *part;         /* [indexed by minor] */
  74         int *sizes;                     /* [idem], device size in blocks */
  75         int nr_real;                    /* number of real devices */
  76
  77         void *real_devices;             /* internal use */
  78         struct gendisk *next;
  79 };
  80
  81 #ifdef CONFIG_SOLARIS_X86_PARTITION
  82
  83 #define SOLARIS_X86_NUMSLICE    8
  84 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
  85
  86 struct solaris_x86_slice {
  87         ushort  s_tag;                  /* ID tag of partition */
  88         ushort  s_flag;                 /* permision flags */
  89         daddr_t s_start;                /* start sector no of partition */
  90         long    s_size;                 /* # of blocks in partition */
  91 };
  92
  93 struct solaris_x86_vtoc {
  94                 unsigned long v_bootinfo[3];    /* info needed by mboot (unsupported) */
  95         unsigned long v_sanity;         /* to verify vtoc sanity */
  96         unsigned long v_version;        /* layout version */
  97         char    v_volume[8];            /* volume name */
  98         ushort  v_sectorsz;             /* sector size in bytes */
  99         ushort  v_nparts;               /* number of partitions */
 100         unsigned long v_reserved[10];   /* free space */
 101         struct solaris_x86_slice
 102                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 103         time_t  timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 104         char    v_asciilabel[128];      /* for compatibility */
 105 };
 106
 107 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 108
 109 #ifdef CONFIG_BSD_DISKLABEL
 110 /*
 111  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 112  * updated by Marc Espie <Marc.Espie@openbsd.org>
 113  */
 114 #define FREEBSD_PARTITION       0xa5    /* FreeBSD Partition ID */
 115 #define OPENBSD_PARTITION       0xa6    /* OpenBSD Partition ID */
 116 #define NETBSD_PARTITION        0xa9    /* NetBSD Partition ID */
 117 #define BSDI_PARTITION          0xb7    /* BSDI Partition ID */
 118
 119 /* Ours is not to wonder why.. */
 120 #define BSD_PARTITION           FREEBSD_PARTITION
 121
 122 /* check against BSD src/sys/sys/disklabel.h for consistency */
 123
 124 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 125 #define BSD_MAXPARTITIONS       8
 126 #define OPENBSD_MAXPARTITIONS   16
 127 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 128 struct bsd_disklabel {
 129         __u32   d_magic;                /* the magic number */
 130         __s16   d_type;                 /* drive type */
 131         __s16   d_subtype;              /* controller/d_type specific */
 132         char    d_typename[16];         /* type name, e.g. "eagle" */
 133         char    d_packname[16];                 /* pack identifier */
 134         __u32   d_secsize;              /* # of bytes per sector */
 135         __u32   d_nsectors;             /* # of data sectors per track */
 136         __u32   d_ntracks;              /* # of tracks per cylinder */
 137         __u32   d_ncylinders;           /* # of data cylinders per unit */
 138         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 139         __u32   d_secperunit;           /* # of data sectors per unit */
 140         __u16   d_sparespertrack;       /* # of spare sectors per track */
 141         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 142         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 143         __u16   d_rpm;                  /* rotational speed */
 144         __u16   d_interleave;           /* hardware sector interleave */
 145         __u16   d_trackskew;            /* sector 0 skew, per track */
 146         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 147         __u32   d_headswitch;           /* head switch time, usec */
 148         __u32   d_trkseek;              /* track-to-track seek, usec */
 149         __u32   d_flags;                /* generic flags */
 150 #define NDDATA 5
 151         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 152 #define NSPARE 5
 153         __u32   d_spare[NSPARE];        /* reserved for future use */
 154         __u32   d_magic2;               /* the magic number (again) */
 155         __u16   d_checksum;             /* xor of data incl. partitions */
 156
 157                         /* filesystem and partition information: */
 158         __u16   d_npartitions;          /* number of partitions in following */
 159         __u32   d_bbsize;               /* size of boot area at sn0, bytes */
 160         __u32   d_sbsize;               /* max size of fs superblock, bytes */
 161         struct  bsd_partition {         /* the partition table */
 162                 __u32   p_size;         /* number of sectors in partition */
 163                 __u32   p_offset;       /* starting sector */
 164                 __u32   p_fsize;        /* filesystem basic fragment size */
 165                 __u8    p_fstype;       /* filesystem type, see below */
 166                 __u8    p_frag;         /* filesystem fragments per block */
 167                 __u16   p_cpg;          /* filesystem cylinders per group */
 168         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 169 };
 170
 171 #endif  /* CONFIG_BSD_DISKLABEL */
 172
 173 #ifdef CONFIG_UNIXWARE_DISKLABEL
 174 /*
 175  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 176  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 177  */
 178
 179 #define UNIXWARE_PARTITION     0x63             /* Partition ID, same as */
 180                                                 /* GNU_HURD and SCO Unix */
 181 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 182 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 183 #define UNIXWARE_NUMSLICE      16
 184 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 185
 186 struct unixware_slice {
 187         __u16   s_label;        /* label */
 188         __u16   s_flags;        /* permission flags */
 189         __u32   start_sect;     /* starting sector */
 190         __u32   nr_sects;       /* number of sectors in slice */
 191 };
 192
 193 struct unixware_disklabel {
 194         __u32   d_type;                 /* drive type */
 195         __u32   d_magic;                /* the magic number */
 196         __u32   d_version;              /* version number */
 197         char    d_serial[12];           /* serial number of the device */
 198         __u32   d_ncylinders;           /* # of data cylinders per device */
 199         __u32   d_ntracks;              /* # of tracks per cylinder */
 200         __u32   d_nsectors;             /* # of data sectors per track */
 201         __u32   d_secsize;              /* # of bytes per sector */
 202         __u32   d_part_start;           /* # of first sector of this partition */
 203         __u32   d_unknown1[12];         /* ? */
 204         __u32   d_alt_tbl;              /* byte offset of alternate table */
 205         __u32   d_alt_len;              /* byte length of alternate table */
 206         __u32   d_phys_cyl;             /* # of physical cylinders per device */
 207         __u32   d_phys_trk;             /* # of physical tracks per cylinder */
 208         __u32   d_phys_sec;             /* # of physical sectors per track */
 209         __u32   d_phys_bytes;           /* # of physical bytes per sector */
 210         __u32   d_unknown2;             /* ? */
 211         __u32   d_unknown3;             /* ? */
 212         __u32   d_pad[8];               /* pad */
 213
 214         struct unixware_vtoc {
 215                 __u32   v_magic;                /* the magic number */
 216                 __u32   v_version;              /* version number */
 217                 char    v_name[8];              /* volume name */
 218                 __u16   v_nslices;              /* # of slices */
 219                 __u16   v_unknown1;             /* ? */
 220                 __u32   v_reserved[10];         /* reserved */
 221                 struct unixware_slice
 222                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 223         } vtoc;
 224
 225 };  /* 408 */
 226
 227 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 228
 229 #ifdef __KERNEL__
 230 extern struct gendisk *gendisk_head;    /* linked list of disks */
 231
 232 char *disk_name (struct gendisk *hd, int minor, char *buf);
 233
 234 int get_hardsect_size(kdev_t dev);
 235 #endif
 236
 237 #endif