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