summaryrefslogtreecommitdiffstats
path: root/include/linux/genhd.h
blob: 78af34840c69982c1c6b6e42b78564de637c174f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
#ifndef _LINUX_GENHD_H
#define _LINUX_GENHD_H

/*
 * 	genhd.h Copyright (C) 1992 Drew Eckhardt
 *	Generic hard disk header file by  
 * 		Drew Eckhardt
 *
 *		<drew@colorado.edu>
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/fs.h>

enum {
/* These three have identical behaviour; use the second one if DOS FDISK gets
   confused about extended/logical partitions starting past cylinder 1023. */
	DOS_EXTENDED_PARTITION = 5,
	LINUX_EXTENDED_PARTITION = 0x85,
	WIN98_EXTENDED_PARTITION = 0x0f,

	LINUX_SWAP_PARTITION = 0x82,
	LINUX_RAID_PARTITION = 0xfd,	/* autodetect RAID partition */

	SOLARIS_X86_PARTITION =	LINUX_SWAP_PARTITION,
	NEW_SOLARIS_X86_PARTITION = 0xbf,

	DM6_AUX1PARTITION = 0x51,	/* no DDO:  use xlated geom */
	DM6_AUX3PARTITION = 0x53,	/* no DDO:  use xlated geom */
	DM6_PARTITION =	0x54,		/* has DDO: use xlated geom & offset */
	EZD_PARTITION =	0x55,		/* EZ-DRIVE */

	FREEBSD_PARTITION = 0xa5,	/* FreeBSD Partition ID */
	OPENBSD_PARTITION = 0xa6,	/* OpenBSD Partition ID */
	NETBSD_PARTITION = 0xa9,	/* NetBSD Partition ID */
	BSDI_PARTITION = 0xb7,		/* BSDI Partition ID */
	MINIX_PARTITION = 0x81,		/* Minix Partition ID */
	UNIXWARE_PARTITION = 0x63,	/* Same as GNU_HURD and SCO Unix */
};

#ifndef __KERNEL__

struct partition {
	unsigned char boot_ind;		/* 0x80 - active */
	unsigned char head;		/* starting head */
	unsigned char sector;		/* starting sector */
	unsigned char cyl;		/* starting cylinder */
	unsigned char sys_ind;		/* What partition type */
	unsigned char end_head;		/* end head */
	unsigned char end_sector;	/* end sector */
	unsigned char end_cyl;		/* end cylinder */
	unsigned int start_sect;	/* starting sector counting from 0 */
	unsigned int nr_sects;		/* nr of sectors in partition */
} __attribute__((packed));

#endif

#ifdef __KERNEL__
struct partition {
	unsigned char boot_ind;		/* 0x80 - active */
	unsigned char head;		/* starting head */
	unsigned char sector;		/* starting sector */
	unsigned char cyl;		/* starting cylinder */
	unsigned char sys_ind;		/* What partition type */
	unsigned char end_head;		/* end head */
	unsigned char end_sector;	/* end sector */
	unsigned char end_cyl;		/* end cylinder */
	__le32 start_sect;	/* starting sector counting from 0 */
	__le32 nr_sects;		/* nr of sectors in partition */
} __attribute__((packed));

struct hd_struct {
	sector_t start_sect;
	sector_t nr_sects;
	struct kobject kobj;
	unsigned reads, read_sectors, writes, write_sectors;
	int policy, partno;
};

#define GENHD_FL_REMOVABLE			1
#define GENHD_FL_DRIVERFS			2
#define GENHD_FL_CD				8
#define GENHD_FL_UP				16
#define GENHD_FL_SUPPRESS_PARTITION_INFO	32

struct disk_stats {
	unsigned read_sectors, write_sectors;
	unsigned reads, writes;
	unsigned read_merges, write_merges;
	unsigned read_ticks, write_ticks;
	unsigned io_ticks;
	unsigned time_in_queue;
};
	
struct gendisk {
	int major;			/* major number of driver */
	int first_minor;
	int minors;                     /* maximum number of minors, =1 for
                                         * disks that can't be partitioned. */
	char disk_name[32];		/* name of major driver */
	struct hd_struct **part;	/* [indexed by minor] */
	struct block_device_operations *fops;
	struct request_queue *queue;
	void *private_data;
	sector_t capacity;

	int flags;
	char devfs_name[64];		/* devfs crap */
	int number;			/* more of the same */
	struct device *driverfs_dev;
	struct kobject kobj;

	struct timer_rand_state *random;
	int policy;

	atomic_t sync_io;		/* RAID */
	unsigned long stamp, stamp_idle;
	int in_flight;
#ifdef	CONFIG_SMP
	struct disk_stats *dkstats;
#else
	struct disk_stats dkstats;
#endif
};

/* Structure for sysfs attributes on block devices */
struct disk_attribute {
	struct attribute attr;
	ssize_t (*show)(struct gendisk *, char *);
	ssize_t (*store)(struct gendisk *, const char *, size_t);
};

/* 
 * Macros to operate on percpu disk statistics:
 *
 * The __ variants should only be called in critical sections. The full
 * variants disable/enable preemption.
 */
#ifdef	CONFIG_SMP
#define __disk_stat_add(gendiskp, field, addnd) 	\
	(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)

#define disk_stat_read(gendiskp, field)					\
({									\
	typeof(gendiskp->dkstats->field) res = 0;			\
	int i;								\
	for (i=0; i < NR_CPUS; i++) {					\
		if (!cpu_possible(i))					\
			continue;					\
		res += per_cpu_ptr(gendiskp->dkstats, i)->field;	\
	}								\
	res;								\
})

static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)	{
	int i;
	for (i=0; i < NR_CPUS; i++) {
		if (cpu_possible(i)) {
			memset(per_cpu_ptr(gendiskp->dkstats, i), value,	
					sizeof (struct disk_stats));
		}
	}
}		
				
#else
#define __disk_stat_add(gendiskp, field, addnd) \
				(gendiskp->dkstats.field += addnd)
#define disk_stat_read(gendiskp, field)	(gendiskp->dkstats.field)

static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)	{
	memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
}
#endif

#define disk_stat_add(gendiskp, field, addnd)			\
	do {							\
		preempt_disable();				\
		__disk_stat_add(gendiskp, field, addnd);	\
		preempt_enable();				\
	} while (0)

#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)

#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)

#define __disk_stat_sub(gendiskp, field, subnd) \
		__disk_stat_add(gendiskp, field, -subnd)
#define disk_stat_sub(gendiskp, field, subnd) \
		disk_stat_add(gendiskp, field, -subnd)


/* Inlines to alloc and free disk stats in struct gendisk */
#ifdef  CONFIG_SMP
static inline int init_disk_stats(struct gendisk *disk)
{
	disk->dkstats = alloc_percpu(struct disk_stats);
	if (!disk->dkstats)
		return 0;
	return 1;
}

static inline void free_disk_stats(struct gendisk *disk)
{
	free_percpu(disk->dkstats);
}
#else	/* CONFIG_SMP */
static inline int init_disk_stats(struct gendisk *disk)
{
	return 1;
}

static inline void free_disk_stats(struct gendisk *disk)
{
}
#endif	/* CONFIG_SMP */

/* drivers/block/ll_rw_blk.c */
extern void disk_round_stats(struct gendisk *disk);

/* drivers/block/genhd.c */
extern int get_blkdev_list(char *, int);
extern void add_disk(struct gendisk *disk);
extern void del_gendisk(struct gendisk *gp);
extern void unlink_gendisk(struct gendisk *gp);
extern struct gendisk *get_gendisk(dev_t dev, int *part);

extern void set_device_ro(struct block_device *bdev, int flag);
extern void set_disk_ro(struct gendisk *disk, int flag);

/* drivers/char/random.c */
extern void add_disk_randomness(struct gendisk *disk);
extern void rand_initialize_disk(struct gendisk *disk);

static inline sector_t get_start_sect(struct block_device *bdev)
{
	return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
}
static inline sector_t get_capacity(struct gendisk *disk)
{
	return disk->capacity;
}
static inline void set_capacity(struct gendisk *disk, sector_t size)
{
	disk->capacity = size;
}

#endif  /*  __KERNEL__  */

#ifdef CONFIG_SOLARIS_X86_PARTITION

#define SOLARIS_X86_NUMSLICE	8
#define SOLARIS_X86_VTOC_SANE	(0x600DDEEEUL)

struct solaris_x86_slice {
	__le16 s_tag;		/* ID tag of partition */
	__le16 s_flag;		/* permission flags */
	__le32 s_start;		/* start sector no of partition */
	__le32 s_size;		/* # of blocks in partition */
};

struct solaris_x86_vtoc {
	unsigned int v_bootinfo[3];	/* info needed by mboot (unsupported) */
	__le32 v_sanity;		/* to verify vtoc sanity */
	__le32 v_version;		/* layout version */
	char	v_volume[8];		/* volume name */
	__le16	v_sectorsz;		/* sector size in bytes */
	__le16	v_nparts;		/* number of partitions */
	unsigned int v_reserved[10];	/* free space */
	struct solaris_x86_slice
		v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
	char	v_asciilabel[128];	/* for compatibility */
};

#endif /* CONFIG_SOLARIS_X86_PARTITION */

#ifdef CONFIG_BSD_DISKLABEL
/*
 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
 * updated by Marc Espie <Marc.Espie@openbsd.org>
 */

/* check against BSD src/sys/sys/disklabel.h for consistency */

#define BSD_DISKMAGIC	(0x82564557UL)	/* The disk magic number */
#define BSD_MAXPARTITIONS	16
#define OPENBSD_MAXPARTITIONS	16
#define BSD_FS_UNUSED		0	/* disklabel unused partition entry ID */
struct bsd_disklabel {
	__le32	d_magic;		/* the magic number */
	__s16	d_type;			/* drive type */
	__s16	d_subtype;		/* controller/d_type specific */
	char	d_typename[16];		/* type name, e.g. "eagle" */
	char	d_packname[16];			/* pack identifier */ 
	__u32	d_secsize;		/* # of bytes per sector */
	__u32	d_nsectors;		/* # of data sectors per track */
	__u32	d_ntracks;		/* # of tracks per cylinder */
	__u32	d_ncylinders;		/* # of data cylinders per unit */
	__u32	d_secpercyl;		/* # of data sectors per cylinder */
	__u32	d_secperunit;		/* # of data sectors per unit */
	__u16	d_sparespertrack;	/* # of spare sectors per track */
	__u16	d_sparespercyl;		/* # of spare sectors per cylinder */
	__u32	d_acylinders;		/* # of alt. cylinders per unit */
	__u16	d_rpm;			/* rotational speed */
	__u16	d_interleave;		/* hardware sector interleave */
	__u16	d_trackskew;		/* sector 0 skew, per track */
	__u16	d_cylskew;		/* sector 0 skew, per cylinder */
	__u32	d_headswitch;		/* head switch time, usec */
	__u32	d_trkseek;		/* track-to-track seek, usec */
	__u32	d_flags;		/* generic flags */
#define NDDATA 5
	__u32	d_drivedata[NDDATA];	/* drive-type specific information */
#define NSPARE 5
	__u32	d_spare[NSPARE];	/* reserved for future use */
	__le32	d_magic2;		/* the magic number (again) */
	__le16	d_checksum;		/* xor of data incl. partitions */

			/* filesystem and partition information: */
	__le16	d_npartitions;		/* number of partitions in following */
	__le32	d_bbsize;		/* size of boot area at sn0, bytes */
	__le32	d_sbsize;		/* max size of fs superblock, bytes */
	struct	bsd_partition {		/* the partition table */
		__le32	p_size;		/* number of sectors in partition */
		__le32	p_offset;	/* starting sector */
		__le32	p_fsize;	/* filesystem basic fragment size */
		__u8	p_fstype;	/* filesystem type, see below */
		__u8	p_frag;		/* filesystem fragments per block */
		__le16	p_cpg;		/* filesystem cylinders per group */
	} d_partitions[BSD_MAXPARTITIONS];	/* actually may be more */
};

#endif	/* CONFIG_BSD_DISKLABEL */

#ifdef CONFIG_UNIXWARE_DISKLABEL
/*
 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
 */

#define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)	/* The disk magic number */
#define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)	/* The slice table magic nr */
#define UNIXWARE_NUMSLICE      16
#define UNIXWARE_FS_UNUSED     0		/* Unused slice entry ID */

struct unixware_slice {
	__le16   s_label;	/* label */
	__le16   s_flags;	/* permission flags */
	__le32   start_sect;	/* starting sector */
	__le32   nr_sects;	/* number of sectors in slice */
};

struct unixware_disklabel {
	__le32   d_type;               	/* drive type */
	__le32   d_magic;                /* the magic number */
	__le32   d_version;              /* version number */
	char    d_serial[12];           /* serial number of the device */
	__le32   d_ncylinders;           /* # of data cylinders per device */
	__le32   d_ntracks;              /* # of tracks per cylinder */
	__le32   d_nsectors;             /* # of data sectors per track */
	__le32   d_secsize;              /* # of bytes per sector */
	__le32   d_part_start;           /* # of first sector of this partition */
	__le32   d_unknown1[12];         /* ? */
 	__le32	d_alt_tbl;              /* byte offset of alternate table */
 	__le32	d_alt_len;              /* byte length of alternate table */
 	__le32	d_phys_cyl;             /* # of physical cylinders per device */
 	__le32	d_phys_trk;             /* # of physical tracks per cylinder */
 	__le32	d_phys_sec;             /* # of physical sectors per track */
 	__le32	d_phys_bytes;           /* # of physical bytes per sector */
 	__le32	d_unknown2;             /* ? */
	__le32   d_unknown3;             /* ? */
	__le32	d_pad[8];               /* pad */

	struct unixware_vtoc {
		__le32	v_magic;		/* the magic number */
		__le32	v_version;		/* version number */
		char	v_name[8];		/* volume name */
		__le16	v_nslices;		/* # of slices */
		__le16	v_unknown1;		/* ? */
		__le32	v_reserved[10];		/* reserved */
		struct unixware_slice
			v_slice[UNIXWARE_NUMSLICE];	/* slice headers */
	} vtoc;

};  /* 408 */

#endif /* CONFIG_UNIXWARE_DISKLABEL */

#ifdef CONFIG_MINIX_SUBPARTITION
#   define MINIX_NR_SUBPARTITIONS  4
#endif /* CONFIG_MINIX_SUBPARTITION */

#ifdef __KERNEL__

char *disk_name (struct gendisk *hd, int part, char *buf);

extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
extern void add_partition(struct gendisk *, int, sector_t, sector_t);
extern void delete_partition(struct gendisk *, int);

extern struct gendisk *alloc_disk_node(int minors, int node_id);
extern struct gendisk *alloc_disk(int minors);
extern struct kobject *get_disk(struct gendisk *disk);
extern void put_disk(struct gendisk *disk);

extern void blk_register_region(dev_t dev, unsigned long range,
			struct module *module,
			struct kobject *(*probe)(dev_t, int *, void *),
			int (*lock)(dev_t, void *),
			void *data);
extern void blk_unregister_region(dev_t dev, unsigned long range);

static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
{
	return bdget(MKDEV(disk->major, disk->first_minor) + index);
}

#endif

#endif
OpenPOWER on IntegriCloud