5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
12 #include <linux/config.h>
13 #include <linux/types.h>
14 #include <linux/major.h>
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
22 #define LINUX_SWAP_PARTITION 0x82
23 #define LINUX_RAID_PARTITION 0xfd /* autodetect RAID partition */
25 #ifdef CONFIG_SOLARIS_X86_PARTITION
26 #define SOLARIS_X86_PARTITION LINUX_SWAP_PARTITION
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 */
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
));
48 # include <linux/devfs_fs_kernel.h>
53 int type
; /* currently RAID or normal */
54 devfs_handle_t de
; /* primary (master) devfs entry */
57 #define GENHD_FL_REMOVABLE 1
60 int major
; /* major number of driver */
61 const char *major_name
; /* name of major driver */
62 int minor_shift
; /* number of times minor is shifted to
64 int max_p
; /* maximum partitions per device */
66 struct hd_struct
*part
; /* [indexed by minor] */
67 int *sizes
; /* [idem], device size in blocks */
68 int nr_real
; /* number of real devices */
70 void *real_devices
; /* internal use */
72 struct block_device_operations
*fops
;
74 devfs_handle_t
*de_arr
; /* one per physical disc */
75 char *flags
; /* one per physical disc */
77 #endif /* __KERNEL__ */
79 #ifdef CONFIG_SOLARIS_X86_PARTITION
81 #define SOLARIS_X86_NUMSLICE 8
82 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
84 struct solaris_x86_slice
{
85 ushort s_tag
; /* ID tag of partition */
86 ushort s_flag
; /* permision flags */
87 daddr_t s_start
; /* start sector no of partition */
88 long s_size
; /* # of blocks in partition */
91 struct solaris_x86_vtoc
{
92 unsigned long v_bootinfo
[3]; /* info needed by mboot (unsupported) */
93 unsigned long v_sanity
; /* to verify vtoc sanity */
94 unsigned long v_version
; /* layout version */
95 char v_volume
[8]; /* volume name */
96 ushort v_sectorsz
; /* sector size in bytes */
97 ushort v_nparts
; /* number of partitions */
98 unsigned long v_reserved
[10]; /* free space */
99 struct solaris_x86_slice
100 v_slice
[SOLARIS_X86_NUMSLICE
]; /* slice headers */
101 time_t timestamp
[SOLARIS_X86_NUMSLICE
]; /* timestamp (unsupported) */
102 char v_asciilabel
[128]; /* for compatibility */
105 #endif /* CONFIG_SOLARIS_X86_PARTITION */
107 #ifdef CONFIG_BSD_DISKLABEL
109 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
110 * updated by Marc Espie <Marc.Espie@openbsd.org>
112 #define FREEBSD_PARTITION 0xa5 /* FreeBSD Partition ID */
113 #define OPENBSD_PARTITION 0xa6 /* OpenBSD Partition ID */
114 #define NETBSD_PARTITION 0xa9 /* NetBSD Partition ID */
115 #define BSDI_PARTITION 0xb7 /* BSDI Partition ID */
117 /* Ours is not to wonder why.. */
118 #define BSD_PARTITION FREEBSD_PARTITION
120 /* check against BSD src/sys/sys/disklabel.h for consistency */
122 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
123 #define BSD_MAXPARTITIONS 8
124 #define OPENBSD_MAXPARTITIONS 16
125 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
126 struct bsd_disklabel
{
127 __u32 d_magic
; /* the magic number */
128 __s16 d_type
; /* drive type */
129 __s16 d_subtype
; /* controller/d_type specific */
130 char d_typename
[16]; /* type name, e.g. "eagle" */
131 char d_packname
[16]; /* pack identifier */
132 __u32 d_secsize
; /* # of bytes per sector */
133 __u32 d_nsectors
; /* # of data sectors per track */
134 __u32 d_ntracks
; /* # of tracks per cylinder */
135 __u32 d_ncylinders
; /* # of data cylinders per unit */
136 __u32 d_secpercyl
; /* # of data sectors per cylinder */
137 __u32 d_secperunit
; /* # of data sectors per unit */
138 __u16 d_sparespertrack
; /* # of spare sectors per track */
139 __u16 d_sparespercyl
; /* # of spare sectors per cylinder */
140 __u32 d_acylinders
; /* # of alt. cylinders per unit */
141 __u16 d_rpm
; /* rotational speed */
142 __u16 d_interleave
; /* hardware sector interleave */
143 __u16 d_trackskew
; /* sector 0 skew, per track */
144 __u16 d_cylskew
; /* sector 0 skew, per cylinder */
145 __u32 d_headswitch
; /* head switch time, usec */
146 __u32 d_trkseek
; /* track-to-track seek, usec */
147 __u32 d_flags
; /* generic flags */
149 __u32 d_drivedata
[NDDATA
]; /* drive-type specific information */
151 __u32 d_spare
[NSPARE
]; /* reserved for future use */
152 __u32 d_magic2
; /* the magic number (again) */
153 __u16 d_checksum
; /* xor of data incl. partitions */
155 /* filesystem and partition information: */
156 __u16 d_npartitions
; /* number of partitions in following */
157 __u32 d_bbsize
; /* size of boot area at sn0, bytes */
158 __u32 d_sbsize
; /* max size of fs superblock, bytes */
159 struct bsd_partition
{ /* the partition table */
160 __u32 p_size
; /* number of sectors in partition */
161 __u32 p_offset
; /* starting sector */
162 __u32 p_fsize
; /* filesystem basic fragment size */
163 __u8 p_fstype
; /* filesystem type, see below */
164 __u8 p_frag
; /* filesystem fragments per block */
165 __u16 p_cpg
; /* filesystem cylinders per group */
166 } d_partitions
[BSD_MAXPARTITIONS
]; /* actually may be more */
169 #endif /* CONFIG_BSD_DISKLABEL */
171 #ifdef CONFIG_UNIXWARE_DISKLABEL
173 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
174 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
177 #define UNIXWARE_PARTITION 0x63 /* Partition ID, same as */
178 /* GNU_HURD and SCO Unix */
179 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
180 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
181 #define UNIXWARE_NUMSLICE 16
182 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
184 struct unixware_slice
{
185 __u16 s_label
; /* label */
186 __u16 s_flags
; /* permission flags */
187 __u32 start_sect
; /* starting sector */
188 __u32 nr_sects
; /* number of sectors in slice */
191 struct unixware_disklabel
{
192 __u32 d_type
; /* drive type */
193 __u32 d_magic
; /* the magic number */
194 __u32 d_version
; /* version number */
195 char d_serial
[12]; /* serial number of the device */
196 __u32 d_ncylinders
; /* # of data cylinders per device */
197 __u32 d_ntracks
; /* # of tracks per cylinder */
198 __u32 d_nsectors
; /* # of data sectors per track */
199 __u32 d_secsize
; /* # of bytes per sector */
200 __u32 d_part_start
; /* # of first sector of this partition */
201 __u32 d_unknown1
[12]; /* ? */
202 __u32 d_alt_tbl
; /* byte offset of alternate table */
203 __u32 d_alt_len
; /* byte length of alternate table */
204 __u32 d_phys_cyl
; /* # of physical cylinders per device */
205 __u32 d_phys_trk
; /* # of physical tracks per cylinder */
206 __u32 d_phys_sec
; /* # of physical sectors per track */
207 __u32 d_phys_bytes
; /* # of physical bytes per sector */
208 __u32 d_unknown2
; /* ? */
209 __u32 d_unknown3
; /* ? */
210 __u32 d_pad
[8]; /* pad */
212 struct unixware_vtoc
{
213 __u32 v_magic
; /* the magic number */
214 __u32 v_version
; /* version number */
215 char v_name
[8]; /* volume name */
216 __u16 v_nslices
; /* # of slices */
217 __u16 v_unknown1
; /* ? */
218 __u32 v_reserved
[10]; /* reserved */
219 struct unixware_slice
220 v_slice
[UNIXWARE_NUMSLICE
]; /* slice headers */
225 #endif /* CONFIG_UNIXWARE_DISKLABEL */
228 extern struct gendisk
*gendisk_head
; /* linked list of disks */
230 char *disk_name (struct gendisk
*hd
, int minor
, char *buf
);
232 extern void devfs_register_partitions (struct gendisk
*dev
, int minor
,
235 int get_hardsect_size(kdev_t dev
);
238 * FIXME: this should use genhd->minor_shift, but that is slow to look up.
240 static inline unsigned int disk_index (kdev_t dev
)
242 int major
= MAJOR(dev
);
243 int minor
= MINOR(dev
);
248 index
= (minor
& 0x00f8) >> 3;
250 case SCSI_DISK0_MAJOR
:
251 index
= (minor
& 0x00f0) >> 4;
253 case IDE0_MAJOR
: /* same as HD_MAJOR */
255 index
= (minor
& 0x0040) >> 6;
258 index
= ((minor
& 0x0040) >> 6) + 2;