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 enum {
17 /* These three have identical behaviour; use the second one if DOS fdisk gets
18 confused about extended/logical partitions starting past cylinder 1023. */
19 DOS_EXTENDED_PARTITION = 5,
20 LINUX_EXTENDED_PARTITION = 0x85,
21 WIN98_EXTENDED_PARTITION = 0x0f,
22
23 LINUX_SWAP_PARTITION = 0x82,
24 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
25
26 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
27
28 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
29 EZD_PARTITION = 0x55, /* EZ-DRIVE */
30 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
31 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
32
33 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
34 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
35 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
36 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
37 /* Ours is not to wonder why.. */
38 BSD_PARTITION = FREEBSD_PARTITION,
39 MINIX_PARTITION = 0x81, /* Minix Partition ID */
40 PLAN9_PARTITION = 0x39, /* Plan 9 Partition ID */
41 UNIXWARE_PARTITION = 0x63, /* Partition ID, same as */
42 /* GNU_HURD and SCO Unix */
43 };
44
45 struct partition {
46 unsigned char boot_ind; /* 0x80 - active */
47 unsigned char head; /* starting head */
48 unsigned char sector; /* starting sector */
49 unsigned char cyl; /* starting cylinder */
50 unsigned char sys_ind; /* What partition type */
51 unsigned char end_head; /* end head */
52 unsigned char end_sector; /* end sector */
53 unsigned char end_cyl; /* end cylinder */
54 unsigned int start_sect; /* starting sector counting from 0 */
55 unsigned int nr_sects; /* nr of sectors in partition */
56 } __attribute__((packed));
57
58 #ifdef __KERNEL__
59 # include <linux/devfs_fs_kernel.h>
60
61 struct hd_struct {
62 unsigned long start_sect;
63 unsigned long nr_sects;
64 devfs_handle_t de; /* primary (master) devfs entry */
65 #ifdef CONFIG_DEVFS_FS
66 int number;
67 #endif /* CONFIG_DEVFS_FS */
68 #ifdef CONFIG_BLK_STATS
69 /* Performance stats: */
70 unsigned int ios_in_flight;
71 unsigned int io_ticks;
72 unsigned int last_idle_time;
73 unsigned int last_queue_change;
74 unsigned int aveq;
75
76 unsigned int rd_ios;
77 unsigned int rd_merges;
78 unsigned int rd_ticks;
79 unsigned int rd_sectors;
80 unsigned int wr_ios;
81 unsigned int wr_merges;
82 unsigned int wr_ticks;
83 unsigned int wr_sectors;
84 #endif /* CONFIG_BLK_STATS */
85 };
86
87 #define GENHD_FL_REMOVABLE 1
88
89 struct gendisk {
90 int major; /* major number of driver */
91 const char *major_name; /* name of major driver */
92 int minor_shift; /* number of times minor is shifted to
93 get real minor */
94 int max_p; /* maximum partitions per device */
95
96 struct hd_struct *part; /* [indexed by minor] */
97 int *sizes; /* [idem], device size in blocks */
98 int nr_real; /* number of real devices */
99
100 void *real_devices; /* internal use */
101 struct gendisk *next;
102 struct block_device_operations *fops;
103
104 devfs_handle_t *de_arr; /* one per physical disc */
105 char *flags; /* one per physical disc */
106 };
107
108 /* drivers/block/genhd.c */
109 extern struct gendisk *gendisk_head;
110
111 extern void add_gendisk(struct gendisk *gp);
112 extern void del_gendisk(struct gendisk *gp);
113 extern struct gendisk *get_gendisk(kdev_t dev);
114 extern int walk_gendisk(int (*walk)(struct gendisk *, void *), void *);
115
116 #endif /* __KERNEL__ */
117
118 #ifdef CONFIG_SOLARIS_X86_PARTITION
119
120 #define SOLARIS_X86_NUMSLICE 8
121 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
122
123 struct solaris_x86_slice {
124 ushort s_tag; /* ID tag of partition */
125 ushort s_flag; /* permission flags */
126 unsigned int s_start; /* start sector no of partition */
127 unsigned int s_size; /* # of blocks in partition */
128 };
129
130 struct solaris_x86_vtoc {
131 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
132 unsigned int v_sanity; /* to verify vtoc sanity */
133 unsigned int v_version; /* layout version */
134 char v_volume[8]; /* volume name */
135 ushort v_sectorsz; /* sector size in bytes */
136 ushort v_nparts; /* number of partitions */
137 unsigned int v_reserved[10]; /* free space */
138 struct solaris_x86_slice
139 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
140 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
141 char v_asciilabel[128]; /* for compatibility */
142 };
143
144 #endif /* CONFIG_SOLARIS_X86_PARTITION */
145
146 #ifdef CONFIG_BSD_DISKLABEL
147 /*
148 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
149 * updated by Marc Espie <Marc.Espie@openbsd.org>
150 */
151
152 /* check against BSD src/sys/sys/disklabel.h for consistency */
153
154 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
155 #define BSD_MAXPARTITIONS 8
156 #define OPENBSD_MAXPARTITIONS 16
157 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
158 struct bsd_disklabel {
159 __u32 d_magic; /* the magic number */
160 __s16 d_type; /* drive type */
161 __s16 d_subtype; /* controller/d_type specific */
162 char d_typename[16]; /* type name, e.g. "eagle" */
163 char d_packname[16]; /* pack identifier */
164 __u32 d_secsize; /* # of bytes per sector */
165 __u32 d_nsectors; /* # of data sectors per track */
166 __u32 d_ntracks; /* # of tracks per cylinder */
167 __u32 d_ncylinders; /* # of data cylinders per unit */
168 __u32 d_secpercyl; /* # of data sectors per cylinder */
169 __u32 d_secperunit; /* # of data sectors per unit */
170 __u16 d_sparespertrack; /* # of spare sectors per track */
171 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
172 __u32 d_acylinders; /* # of alt. cylinders per unit */
173 __u16 d_rpm; /* rotational speed */
174 __u16 d_interleave; /* hardware sector interleave */
175 __u16 d_trackskew; /* sector 0 skew, per track */
176 __u16 d_cylskew; /* sector 0 skew, per cylinder */
177 __u32 d_headswitch; /* head switch time, usec */
178 __u32 d_trkseek; /* track-to-track seek, usec */
179 __u32 d_flags; /* generic flags */
180 #define NDDATA 5
181 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
182 #define NSPARE 5
183 __u32 d_spare[NSPARE]; /* reserved for future use */
184 __u32 d_magic2; /* the magic number (again) */
185 __u16 d_checksum; /* xor of data incl. partitions */
186
187 /* filesystem and partition information: */
188 __u16 d_npartitions; /* number of partitions in following */
189 __u32 d_bbsize; /* size of boot area at sn0, bytes */
190 __u32 d_sbsize; /* max size of fs superblock, bytes */
191 struct bsd_partition { /* the partition table */
192 __u32 p_size; /* number of sectors in partition */
193 __u32 p_offset; /* starting sector */
194 __u32 p_fsize; /* filesystem basic fragment size */
195 __u8 p_fstype; /* filesystem type, see below */
196 __u8 p_frag; /* filesystem fragments per block */
197 __u16 p_cpg; /* filesystem cylinders per group */
198 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
199 };
200
201 #endif /* CONFIG_BSD_DISKLABEL */
202
203 #ifdef CONFIG_UNIXWARE_DISKLABEL
204 /*
205 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
206 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
207 */
208
209 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
210 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
211 #define UNIXWARE_NUMSLICE 16
212 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
213
214 struct unixware_slice {
215 __u16 s_label; /* label */
216 __u16 s_flags; /* permission flags */
217 __u32 start_sect; /* starting sector */
218 __u32 nr_sects; /* number of sectors in slice */
219 };
220
221 struct unixware_disklabel {
222 __u32 d_type; /* drive type */
223 __u32 d_magic; /* the magic number */
224 __u32 d_version; /* version number */
225 char d_serial[12]; /* serial number of the device */
226 __u32 d_ncylinders; /* # of data cylinders per device */
227 __u32 d_ntracks; /* # of tracks per cylinder */
228 __u32 d_nsectors; /* # of data sectors per track */
229 __u32 d_secsize; /* # of bytes per sector */
230 __u32 d_part_start; /* # of first sector of this partition */
231 __u32 d_unknown1[12]; /* ? */
232 __u32 d_alt_tbl; /* byte offset of alternate table */
233 __u32 d_alt_len; /* byte length of alternate table */
234 __u32 d_phys_cyl; /* # of physical cylinders per device */
235 __u32 d_phys_trk; /* # of physical tracks per cylinder */
236 __u32 d_phys_sec; /* # of physical sectors per track */
237 __u32 d_phys_bytes; /* # of physical bytes per sector */
238 __u32 d_unknown2; /* ? */
239 __u32 d_unknown3; /* ? */
240 __u32 d_pad[8]; /* pad */
241
242 struct unixware_vtoc {
243 __u32 v_magic; /* the magic number */
244 __u32 v_version; /* version number */
245 char v_name[8]; /* volume name */
246 __u16 v_nslices; /* # of slices */
247 __u16 v_unknown1; /* ? */
248 __u32 v_reserved[10]; /* reserved */
249 struct unixware_slice
250 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
251 } vtoc;
252
253 }; /* 408 */
254
255 #endif /* CONFIG_UNIXWARE_DISKLABEL */
256
257 #ifdef CONFIG_MINIX_SUBPARTITION
258 # define MINIX_NR_SUBPARTITIONS 4
259 #endif /* CONFIG_MINIX_SUBPARTITION */
260
261 #ifdef __KERNEL__
262
263 char *disk_name (struct gendisk *hd, int minor, char *buf);
264
265 /*
266 * Account for the completion of an IO request (used by drivers which
267 * bypass the normal end_request processing)
268 */
269 struct request;
270
271 #ifdef CONFIG_BLK_STATS
272 extern void disk_round_stats(struct hd_struct *hd);
273 extern void req_new_io(struct request *req, int merge, int sectors);
274 extern void req_merged_io(struct request *req);
275 extern void req_finished_io(struct request *req);
276 #else
req_new_io(struct request * req,int merge,int sectors)277 static inline void req_new_io(struct request *req, int merge, int sectors) { }
req_merged_io(struct request * req)278 static inline void req_merged_io(struct request *req) { }
req_finished_io(struct request * req)279 static inline void req_finished_io(struct request *req) { }
280 #endif /* CONFIG_BLK_STATS */
281
282 extern void devfs_register_partitions (struct gendisk *dev, int minor,
283 int unregister);
284
285
286
287 /*
288 * FIXME: this should use genhd->minor_shift, but that is slow to look up.
289 */
disk_index(kdev_t dev)290 static inline unsigned int disk_index (kdev_t dev)
291 {
292 int major = MAJOR(dev);
293 int minor = MINOR(dev);
294 unsigned int index;
295
296 switch (major) {
297 case DAC960_MAJOR+0:
298 index = (minor & 0x00f8) >> 3;
299 break;
300 case SCSI_DISK0_MAJOR:
301 index = (minor & 0x00f0) >> 4;
302 break;
303 case IDE0_MAJOR: /* same as HD_MAJOR */
304 case XT_DISK_MAJOR:
305 index = (minor & 0x0040) >> 6;
306 break;
307 case IDE1_MAJOR:
308 index = ((minor & 0x0040) >> 6) + 2;
309 break;
310 default:
311 return 0;
312 }
313 return index;
314 }
315
316 #endif
317
318 #endif
319