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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/types.h>
13
14#ifdef CONFIG_BLOCK
15
16enum {
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 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
24
25 LINUX_SWAP_PARTITION = 0x82,
26 LINUX_DATA_PARTITION = 0x83,
27 LINUX_LVM_PARTITION = 0x8e,
28 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
29
30 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
31 NEW_SOLARIS_X86_PARTITION = 0xbf,
32
33 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
34 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
35 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
36 EZD_PARTITION = 0x55, /* EZ-DRIVE */
37
38 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
39 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
40 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
41 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
42 MINIX_PARTITION = 0x81, /* Minix Partition ID */
43 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
44};
45
46#ifndef __KERNEL__
47
48struct partition {
49 unsigned char boot_ind; /* 0x80 - active */
50 unsigned char head; /* starting head */
51 unsigned char sector; /* starting sector */
52 unsigned char cyl; /* starting cylinder */
53 unsigned char sys_ind; /* What partition type */
54 unsigned char end_head; /* end head */
55 unsigned char end_sector; /* end sector */
56 unsigned char end_cyl; /* end cylinder */
57 unsigned int start_sect; /* starting sector counting from 0 */
58 unsigned int nr_sects; /* nr of sectors in partition */
59} __attribute__((packed));
60
61#endif
62
63#ifdef __KERNEL__
64#include <linux/major.h>
65#include <linux/device.h>
66#include <linux/smp.h>
67#include <linux/string.h>
68#include <linux/fs.h>
69
70struct partition {
71 unsigned char boot_ind; /* 0x80 - active */
72 unsigned char head; /* starting head */
73 unsigned char sector; /* starting sector */
74 unsigned char cyl; /* starting cylinder */
75 unsigned char sys_ind; /* What partition type */
76 unsigned char end_head; /* end head */
77 unsigned char end_sector; /* end sector */
78 unsigned char end_cyl; /* end cylinder */
79 __le32 start_sect; /* starting sector counting from 0 */
80 __le32 nr_sects; /* nr of sectors in partition */
81} __attribute__((packed));
82
83struct hd_struct {
84 sector_t start_sect;
85 sector_t nr_sects;
86 struct kobject kobj;
87 struct kobject *holder_dir;
88 unsigned ios[2], sectors[2]; /* READs and WRITEs */
89 int policy, partno;
90#ifdef CONFIG_FAIL_MAKE_REQUEST
91 int make_it_fail;
92#endif
93};
94
95#define GENHD_FL_REMOVABLE 1
96#define GENHD_FL_DRIVERFS 2
97#define GENHD_FL_CD 8
98#define GENHD_FL_UP 16
99#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
100#define GENHD_FL_FAIL 64
101
102struct disk_stats {
103 unsigned long sectors[2]; /* READs and WRITEs */
104 unsigned long ios[2];
105 unsigned long merges[2];
106 unsigned long ticks[2];
107 unsigned long io_ticks;
108 unsigned long time_in_queue;
109};
110
111struct gendisk {
112 int major; /* major number of driver */
113 int first_minor;
114 int minors; /* maximum number of minors, =1 for
115 * disks that can't be partitioned. */
116 char disk_name[32]; /* name of major driver */
117 struct hd_struct **part; /* [indexed by minor] */
118 int part_uevent_suppress;
119 struct block_device_operations *fops;
120 struct request_queue *queue;
121 void *private_data;
122 sector_t capacity;
123
124 int flags;
125 struct device *driverfs_dev;
126 struct kobject kobj;
127 struct kobject *holder_dir;
128 struct kobject *slave_dir;
129
130 struct timer_rand_state *random;
131 int policy;
132
133 atomic_t sync_io; /* RAID */
134 unsigned long stamp;
135 int in_flight;
136#ifdef CONFIG_SMP
137 struct disk_stats *dkstats;
138#else
139 struct disk_stats dkstats;
140#endif
141};
142
143/* Structure for sysfs attributes on block devices */
144struct disk_attribute {
145 struct attribute attr;
146 ssize_t (*show)(struct gendisk *, char *);
147 ssize_t (*store)(struct gendisk *, const char *, size_t);
148};
149
150/*
151 * Macros to operate on percpu disk statistics:
152 *
153 * The __ variants should only be called in critical sections. The full
154 * variants disable/enable preemption.
155 */
156#ifdef CONFIG_SMP
157#define __disk_stat_add(gendiskp, field, addnd) \
158 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
159
160#define disk_stat_read(gendiskp, field) \
161({ \
162 typeof(gendiskp->dkstats->field) res = 0; \
163 int i; \
164 for_each_possible_cpu(i) \
165 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
166 res; \
167})
168
169static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
170 int i;
171 for_each_possible_cpu(i)
172 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
173 sizeof (struct disk_stats));
174}
175
176#else
177#define __disk_stat_add(gendiskp, field, addnd) \
178 (gendiskp->dkstats.field += addnd)
179#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
180
181static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
182 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
183}
184#endif
185
186#define disk_stat_add(gendiskp, field, addnd) \
187 do { \
188 preempt_disable(); \
189 __disk_stat_add(gendiskp, field, addnd); \
190 preempt_enable(); \
191 } while (0)
192
193#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
194#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
195
196#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
197#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
198
199#define __disk_stat_sub(gendiskp, field, subnd) \
200 __disk_stat_add(gendiskp, field, -subnd)
201#define disk_stat_sub(gendiskp, field, subnd) \
202 disk_stat_add(gendiskp, field, -subnd)
203
204
205/* Inlines to alloc and free disk stats in struct gendisk */
206#ifdef CONFIG_SMP
207static inline int init_disk_stats(struct gendisk *disk)
208{
209 disk->dkstats = alloc_percpu(struct disk_stats);
210 if (!disk->dkstats)
211 return 0;
212 return 1;
213}
214
215static inline void free_disk_stats(struct gendisk *disk)
216{
217 free_percpu(disk->dkstats);
218}
219#else /* CONFIG_SMP */
220static inline int init_disk_stats(struct gendisk *disk)
221{
222 return 1;
223}
224
225static inline void free_disk_stats(struct gendisk *disk)
226{
227}
228#endif /* CONFIG_SMP */
229
230/* drivers/block/ll_rw_blk.c */
231extern void disk_round_stats(struct gendisk *disk);
232
233/* drivers/block/genhd.c */
234extern int get_blkdev_list(char *, int);
235extern void add_disk(struct gendisk *disk);
236extern void del_gendisk(struct gendisk *gp);
237extern void unlink_gendisk(struct gendisk *gp);
238extern struct gendisk *get_gendisk(dev_t dev, int *part);
239
240extern void set_device_ro(struct block_device *bdev, int flag);
241extern void set_disk_ro(struct gendisk *disk, int flag);
242
243/* drivers/char/random.c */
244extern void add_disk_randomness(struct gendisk *disk);
245extern void rand_initialize_disk(struct gendisk *disk);
246
247static inline sector_t get_start_sect(struct block_device *bdev)
248{
249 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
250}
251static inline sector_t get_capacity(struct gendisk *disk)
252{
253 return disk->capacity;
254}
255static inline void set_capacity(struct gendisk *disk, sector_t size)
256{
257 disk->capacity = size;
258}
259
260#endif /* __KERNEL__ */
261
262#ifdef CONFIG_SOLARIS_X86_PARTITION
263
264#define SOLARIS_X86_NUMSLICE 8
265#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
266
267struct solaris_x86_slice {
268 __le16 s_tag; /* ID tag of partition */
269 __le16 s_flag; /* permission flags */
270 __le32 s_start; /* start sector no of partition */
271 __le32 s_size; /* # of blocks in partition */
272};
273
274struct solaris_x86_vtoc {
275 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
276 __le32 v_sanity; /* to verify vtoc sanity */
277 __le32 v_version; /* layout version */
278 char v_volume[8]; /* volume name */
279 __le16 v_sectorsz; /* sector size in bytes */
280 __le16 v_nparts; /* number of partitions */
281 unsigned int v_reserved[10]; /* free space */
282 struct solaris_x86_slice
283 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
284 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
285 char v_asciilabel[128]; /* for compatibility */
286};
287
288#endif /* CONFIG_SOLARIS_X86_PARTITION */
289
290#ifdef CONFIG_BSD_DISKLABEL
291/*
292 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
293 * updated by Marc Espie <Marc.Espie@openbsd.org>
294 */
295
296/* check against BSD src/sys/sys/disklabel.h for consistency */
297
298#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
299#define BSD_MAXPARTITIONS 16
300#define OPENBSD_MAXPARTITIONS 16
301#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
302struct bsd_disklabel {
303 __le32 d_magic; /* the magic number */
304 __s16 d_type; /* drive type */
305 __s16 d_subtype; /* controller/d_type specific */
306 char d_typename[16]; /* type name, e.g. "eagle" */
307 char d_packname[16]; /* pack identifier */
308 __u32 d_secsize; /* # of bytes per sector */
309 __u32 d_nsectors; /* # of data sectors per track */
310 __u32 d_ntracks; /* # of tracks per cylinder */
311 __u32 d_ncylinders; /* # of data cylinders per unit */
312 __u32 d_secpercyl; /* # of data sectors per cylinder */
313 __u32 d_secperunit; /* # of data sectors per unit */
314 __u16 d_sparespertrack; /* # of spare sectors per track */
315 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
316 __u32 d_acylinders; /* # of alt. cylinders per unit */
317 __u16 d_rpm; /* rotational speed */
318 __u16 d_interleave; /* hardware sector interleave */
319 __u16 d_trackskew; /* sector 0 skew, per track */
320 __u16 d_cylskew; /* sector 0 skew, per cylinder */
321 __u32 d_headswitch; /* head switch time, usec */
322 __u32 d_trkseek; /* track-to-track seek, usec */
323 __u32 d_flags; /* generic flags */
324#define NDDATA 5
325 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
326#define NSPARE 5
327 __u32 d_spare[NSPARE]; /* reserved for future use */
328 __le32 d_magic2; /* the magic number (again) */
329 __le16 d_checksum; /* xor of data incl. partitions */
330
331 /* filesystem and partition information: */
332 __le16 d_npartitions; /* number of partitions in following */
333 __le32 d_bbsize; /* size of boot area at sn0, bytes */
334 __le32 d_sbsize; /* max size of fs superblock, bytes */
335 struct bsd_partition { /* the partition table */
336 __le32 p_size; /* number of sectors in partition */
337 __le32 p_offset; /* starting sector */
338 __le32 p_fsize; /* filesystem basic fragment size */
339 __u8 p_fstype; /* filesystem type, see below */
340 __u8 p_frag; /* filesystem fragments per block */
341 __le16 p_cpg; /* filesystem cylinders per group */
342 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
343};
344
345#endif /* CONFIG_BSD_DISKLABEL */
346
347#ifdef CONFIG_UNIXWARE_DISKLABEL
348/*
349 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
350 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
351 */
352
353#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
354#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
355#define UNIXWARE_NUMSLICE 16
356#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
357
358struct unixware_slice {
359 __le16 s_label; /* label */
360 __le16 s_flags; /* permission flags */
361 __le32 start_sect; /* starting sector */
362 __le32 nr_sects; /* number of sectors in slice */
363};
364
365struct unixware_disklabel {
366 __le32 d_type; /* drive type */
367 __le32 d_magic; /* the magic number */
368 __le32 d_version; /* version number */
369 char d_serial[12]; /* serial number of the device */
370 __le32 d_ncylinders; /* # of data cylinders per device */
371 __le32 d_ntracks; /* # of tracks per cylinder */
372 __le32 d_nsectors; /* # of data sectors per track */
373 __le32 d_secsize; /* # of bytes per sector */
374 __le32 d_part_start; /* # of first sector of this partition */
375 __le32 d_unknown1[12]; /* ? */
376 __le32 d_alt_tbl; /* byte offset of alternate table */
377 __le32 d_alt_len; /* byte length of alternate table */
378 __le32 d_phys_cyl; /* # of physical cylinders per device */
379 __le32 d_phys_trk; /* # of physical tracks per cylinder */
380 __le32 d_phys_sec; /* # of physical sectors per track */
381 __le32 d_phys_bytes; /* # of physical bytes per sector */
382 __le32 d_unknown2; /* ? */
383 __le32 d_unknown3; /* ? */
384 __le32 d_pad[8]; /* pad */
385
386 struct unixware_vtoc {
387 __le32 v_magic; /* the magic number */
388 __le32 v_version; /* version number */
389 char v_name[8]; /* volume name */
390 __le16 v_nslices; /* # of slices */
391 __le16 v_unknown1; /* ? */
392 __le32 v_reserved[10]; /* reserved */
393 struct unixware_slice
394 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
395 } vtoc;
396
397}; /* 408 */
398
399#endif /* CONFIG_UNIXWARE_DISKLABEL */
400
401#ifdef CONFIG_MINIX_SUBPARTITION
402# define MINIX_NR_SUBPARTITIONS 4
403#endif /* CONFIG_MINIX_SUBPARTITION */
404
405#ifdef __KERNEL__
406
407#define ADDPART_FLAG_NONE 0
408#define ADDPART_FLAG_RAID 1
409#define ADDPART_FLAG_WHOLEDISK 2
410
411char *disk_name (struct gendisk *hd, int part, char *buf);
412
413extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
414extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
415extern void delete_partition(struct gendisk *, int);
416
417extern struct gendisk *alloc_disk_node(int minors, int node_id);
418extern struct gendisk *alloc_disk(int minors);
419extern struct kobject *get_disk(struct gendisk *disk);
420extern void put_disk(struct gendisk *disk);
421
422extern void blk_register_region(dev_t dev, unsigned long range,
423 struct module *module,
424 struct kobject *(*probe)(dev_t, int *, void *),
425 int (*lock)(dev_t, void *),
426 void *data);
427extern void blk_unregister_region(dev_t dev, unsigned long range);
428
429static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
430{
431 return bdget(MKDEV(disk->major, disk->first_minor) + index);
432}
433
434#endif
435
436#endif
437
438#endif