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 #include <linux/major.h>
  15
  16 /* These three have identical behaviour; use the second one if DOS fdisk gets
  17    confused about extended/logical partitions starting past cylinder 1023. */
  18 #define DOS_EXTENDED_PARTITION 5
  19 #define LINUX_EXTENDED_PARTITION 0x85
  20 #define WIN98_EXTENDED_PARTITION 0x0f
  21
  22 #define LINUX_SWAP_PARTITION    0x82
  23 #define LINUX_RAID_PARTITION    0xfd    /* autodetect RAID partition */
  24
  25 #ifdef CONFIG_SOLARIS_X86_PARTITION
  26 #define SOLARIS_X86_PARTITION   LINUX_SWAP_PARTITION
  27 #endif
  28
  29 #define DM6_PARTITION           0x54    /* has DDO: use xlated geom & offset */
  30 #define EZD_PARTITION           0x55    /* EZ-DRIVE */
  31 #define DM6_AUX1PARTITION       0x51    /* no DDO:  use xlated geom */
  32 #define DM6_AUX3PARTITION       0x53    /* no DDO:  use xlated geom */
  33
  34 struct partition {
  35         unsigned char boot_ind;         /* 0x80 - active */
  36         unsigned char head;             /* starting head */
  37         unsigned char sector;           /* starting sector */
  38         unsigned char cyl;              /* starting cylinder */
  39         unsigned char sys_ind;          /* What partition type */
  40         unsigned char end_head;         /* end head */
  41         unsigned char end_sector;       /* end sector */
  42         unsigned char end_cyl;          /* end cylinder */
  43         unsigned int start_sect;        /* starting sector counting from 0 */
  44         unsigned int nr_sects;          /* nr of sectors in partition */
  45 } __attribute__((packed));
  46
  47 #ifdef __KERNEL__
  48 #  include <linux/devfs_fs_kernel.h>
  49
  50 struct hd_struct {
  51         long start_sect;
  52         long nr_sects;
  53         devfs_handle_t de;              /* primary (master) devfs entry  */
  54 };
  55
  56 #define GENHD_FL_REMOVABLE  1
  57
  58 struct gendisk {
  59         int major;                      /* major number of driver */
  60         const char *major_name;         /* name of major driver */
  61         int minor_shift;                /* number of times minor is shifted to
  62                                            get real minor */
  63         int max_p;                      /* maximum partitions per device */
  64
  65         struct hd_struct *part;         /* [indexed by minor] */
  66         int *sizes;                     /* [idem], device size in blocks */
  67         int nr_real;                    /* number of real devices */
  68
  69         void *real_devices;             /* internal use */
  70         struct gendisk *next;
  71         struct block_device_operations *fops;
  72
  73         devfs_handle_t *de_arr;         /* one per physical disc */
  74         char *flags;                    /* one per physical disc */
  75 };
  76 #endif  /*  __KERNEL__  */
  77
  78 #ifdef CONFIG_SOLARIS_X86_PARTITION
  79
  80 #define SOLARIS_X86_NUMSLICE    8
  81 #define SOLARIS_X86_VTOC_SANE   (0x600DDEEEUL)
  82
  83 struct solaris_x86_slice {
  84         ushort  s_tag;                  /* ID tag of partition */
  85         ushort  s_flag;                 /* permision flags */
  86         daddr_t s_start;                /* start sector no of partition */
  87         long    s_size;                 /* # of blocks in partition */
  88 };
  89
  90 struct solaris_x86_vtoc {
  91                 unsigned long v_bootinfo[3];    /* info needed by mboot (unsupported) */
  92         unsigned long v_sanity;         /* to verify vtoc sanity */
  93         unsigned long v_version;        /* layout version */
  94         char    v_volume[8];            /* volume name */
  95         ushort  v_sectorsz;             /* sector size in bytes */
  96         ushort  v_nparts;               /* number of partitions */
  97         unsigned long v_reserved[10];   /* free space */
  98         struct solaris_x86_slice
  99                 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
 100         time_t  timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
 101         char    v_asciilabel[128];      /* for compatibility */
 102 };
 103
 104 #endif /* CONFIG_SOLARIS_X86_PARTITION */
 105
 106 #ifdef CONFIG_BSD_DISKLABEL
 107 /*
 108  * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 109  * updated by Marc Espie <Marc.Espie@openbsd.org>
 110  */
 111 #define FREEBSD_PARTITION       0xa5    /* FreeBSD Partition ID */
 112 #define OPENBSD_PARTITION       0xa6    /* OpenBSD Partition ID */
 113 #define NETBSD_PARTITION        0xa9    /* NetBSD Partition ID */
 114 #define BSDI_PARTITION          0xb7    /* BSDI Partition ID */
 115
 116 /* Ours is not to wonder why.. */
 117 #define BSD_PARTITION           FREEBSD_PARTITION
 118
 119 /* check against BSD src/sys/sys/disklabel.h for consistency */
 120
 121 #define BSD_DISKMAGIC   (0x82564557UL)  /* The disk magic number */
 122 #define BSD_MAXPARTITIONS       8
 123 #define OPENBSD_MAXPARTITIONS   16
 124 #define BSD_FS_UNUSED           0       /* disklabel unused partition entry ID */
 125 struct bsd_disklabel {
 126         __u32   d_magic;                /* the magic number */
 127         __s16   d_type;                 /* drive type */
 128         __s16   d_subtype;              /* controller/d_type specific */
 129         char    d_typename[16];         /* type name, e.g. "eagle" */
 130         char    d_packname[16];                 /* pack identifier */
 131         __u32   d_secsize;              /* # of bytes per sector */
 132         __u32   d_nsectors;             /* # of data sectors per track */
 133         __u32   d_ntracks;              /* # of tracks per cylinder */
 134         __u32   d_ncylinders;           /* # of data cylinders per unit */
 135         __u32   d_secpercyl;            /* # of data sectors per cylinder */
 136         __u32   d_secperunit;           /* # of data sectors per unit */
 137         __u16   d_sparespertrack;       /* # of spare sectors per track */
 138         __u16   d_sparespercyl;         /* # of spare sectors per cylinder */
 139         __u32   d_acylinders;           /* # of alt. cylinders per unit */
 140         __u16   d_rpm;                  /* rotational speed */
 141         __u16   d_interleave;           /* hardware sector interleave */
 142         __u16   d_trackskew;            /* sector 0 skew, per track */
 143         __u16   d_cylskew;              /* sector 0 skew, per cylinder */
 144         __u32   d_headswitch;           /* head switch time, usec */
 145         __u32   d_trkseek;              /* track-to-track seek, usec */
 146         __u32   d_flags;                /* generic flags */
 147 #define NDDATA 5
 148         __u32   d_drivedata[NDDATA];    /* drive-type specific information */
 149 #define NSPARE 5
 150         __u32   d_spare[NSPARE];        /* reserved for future use */
 151         __u32   d_magic2;               /* the magic number (again) */
 152         __u16   d_checksum;             /* xor of data incl. partitions */
 153
 154                         /* filesystem and partition information: */
 155         __u16   d_npartitions;          /* number of partitions in following */
 156         __u32   d_bbsize;               /* size of boot area at sn0, bytes */
 157         __u32   d_sbsize;               /* max size of fs superblock, bytes */
 158         struct  bsd_partition {         /* the partition table */
 159                 __u32   p_size;         /* number of sectors in partition */
 160                 __u32   p_offset;       /* starting sector */
 161                 __u32   p_fsize;        /* filesystem basic fragment size */
 162                 __u8    p_fstype;       /* filesystem type, see below */
 163                 __u8    p_frag;         /* filesystem fragments per block */
 164                 __u16   p_cpg;          /* filesystem cylinders per group */
 165         } d_partitions[BSD_MAXPARTITIONS];      /* actually may be more */
 166 };
 167
 168 #endif  /* CONFIG_BSD_DISKLABEL */
 169
 170 #ifdef CONFIG_UNIXWARE_DISKLABEL
 171 /*
 172  * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 173  * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 174  */
 175
 176 #define UNIXWARE_PARTITION     0x63             /* Partition ID, same as */
 177                                                 /* GNU_HURD and SCO Unix */
 178 #define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)   /* The disk magic number */
 179 #define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)   /* The slice table magic nr */
 180 #define UNIXWARE_NUMSLICE      16
 181 #define UNIXWARE_FS_UNUSED     0                /* Unused slice entry ID */
 182
 183 struct unixware_slice {
 184         __u16   s_label;        /* label */
 185         __u16   s_flags;        /* permission flags */
 186         __u32   start_sect;     /* starting sector */
 187         __u32   nr_sects;       /* number of sectors in slice */
 188 };
 189
 190 struct unixware_disklabel {
 191         __u32   d_type;                 /* drive type */
 192         __u32   d_magic;                /* the magic number */
 193         __u32   d_version;              /* version number */
 194         char    d_serial[12];           /* serial number of the device */
 195         __u32   d_ncylinders;           /* # of data cylinders per device */
 196         __u32   d_ntracks;              /* # of tracks per cylinder */
 197         __u32   d_nsectors;             /* # of data sectors per track */
 198         __u32   d_secsize;              /* # of bytes per sector */
 199         __u32   d_part_start;           /* # of first sector of this partition */
 200         __u32   d_unknown1[12];         /* ? */
 201         __u32   d_alt_tbl;              /* byte offset of alternate table */
 202         __u32   d_alt_len;              /* byte length of alternate table */
 203         __u32   d_phys_cyl;             /* # of physical cylinders per device */
 204         __u32   d_phys_trk;             /* # of physical tracks per cylinder */
 205         __u32   d_phys_sec;             /* # of physical sectors per track */
 206         __u32   d_phys_bytes;           /* # of physical bytes per sector */
 207         __u32   d_unknown2;             /* ? */
 208         __u32   d_unknown3;             /* ? */
 209         __u32   d_pad[8];               /* pad */
 210
 211         struct unixware_vtoc {
 212                 __u32   v_magic;                /* the magic number */
 213                 __u32   v_version;              /* version number */
 214                 char    v_name[8];              /* volume name */
 215                 __u16   v_nslices;              /* # of slices */
 216                 __u16   v_unknown1;             /* ? */
 217                 __u32   v_reserved[10];         /* reserved */
 218                 struct unixware_slice
 219                         v_slice[UNIXWARE_NUMSLICE];     /* slice headers */
 220         } vtoc;
 221
 222 };  /* 408 */
 223
 224 #endif /* CONFIG_UNIXWARE_DISKLABEL */
 225
 226 #ifdef __KERNEL__
 227 extern struct gendisk *gendisk_head;    /* linked list of disks */
 228
 229 char *disk_name (struct gendisk *hd, int minor, char *buf);
 230
 231 extern void devfs_register_partitions (struct gendisk *dev, int minor,
 232                                        int unregister);
 233
 234 int get_hardsect_size(kdev_t dev);
 235
 236 /*
 237  * FIXME: this should use genhd->minor_shift, but that is slow to look up.
 238  */
 239 static inline unsigned int disk_index (kdev_t dev)
 240 {
 241         int major = MAJOR(dev);
 242         int minor = MINOR(dev);
 243         unsigned int index;
 244
 245         switch (major) {
 246                 case DAC960_MAJOR+0:
 247                         index = (minor & 0x00f8) >> 3;
 248                         break;
 249                 case SCSI_DISK0_MAJOR:
 250                         index = (minor & 0x00f0) >> 4;
 251                         break;
 252                 case IDE0_MAJOR:        /* same as HD_MAJOR */
 253                 case XT_DISK_MAJOR:
 254                         index = (minor & 0x0040) >> 6;
 255                         break;
 256                 case IDE1_MAJOR:
 257                         index = ((minor & 0x0040) >> 6) + 2;
 258                         break;
 259                 default:
 260                         return 0;
 261         }
 262         return index;
 263 }
 264
 265 #endif
 266
 267 #endif