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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/config.h>
13#include <linux/types.h>
14#include <linux/major.h>
15#include <linux/device.h>
16#include <linux/smp.h>
17#include <linux/string.h>
18#include <linux/fs.h>
19
20enum {
21/* These three have identical behaviour; use the second one if DOS FDISK gets
22 confused about extended/logical partitions starting past cylinder 1023. */
23 DOS_EXTENDED_PARTITION = 5,
24 LINUX_EXTENDED_PARTITION = 0x85,
25 WIN98_EXTENDED_PARTITION = 0x0f,
26
27 LINUX_SWAP_PARTITION = 0x82,
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__
64struct partition {
65 unsigned char boot_ind; /* 0x80 - active */
66 unsigned char head; /* starting head */
67 unsigned char sector; /* starting sector */
68 unsigned char cyl; /* starting cylinder */
69 unsigned char sys_ind; /* What partition type */
70 unsigned char end_head; /* end head */
71 unsigned char end_sector; /* end sector */
72 unsigned char end_cyl; /* end cylinder */
73 __le32 start_sect; /* starting sector counting from 0 */
74 __le32 nr_sects; /* nr of sectors in partition */
75} __attribute__((packed));
76
77struct hd_struct {
78 sector_t start_sect;
79 sector_t nr_sects;
80 struct kobject kobj;
81 unsigned ios[2], sectors[2]; /* READs and WRITEs */
82 int policy, partno;
83};
84
85#define GENHD_FL_REMOVABLE 1
86#define GENHD_FL_DRIVERFS 2
87#define GENHD_FL_CD 8
88#define GENHD_FL_UP 16
89#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
90
91struct disk_stats {
92 unsigned sectors[2]; /* READs and WRITEs */
93 unsigned ios[2];
94 unsigned merges[2];
95 unsigned ticks[2];
96 unsigned io_ticks;
97 unsigned time_in_queue;
98};
99
100struct gendisk {
101 int major; /* major number of driver */
102 int first_minor;
103 int minors; /* maximum number of minors, =1 for
104 * disks that can't be partitioned. */
105 char disk_name[32]; /* name of major driver */
106 struct hd_struct **part; /* [indexed by minor] */
107 struct block_device_operations *fops;
108 struct request_queue *queue;
109 void *private_data;
110 sector_t capacity;
111
112 int flags;
113 char devfs_name[64]; /* devfs crap */
114 int number; /* more of the same */
115 struct device *driverfs_dev;
116 struct kobject kobj;
117
118 struct timer_rand_state *random;
119 int policy;
120
121 atomic_t sync_io; /* RAID */
122 unsigned long stamp;
123 int in_flight;
124#ifdef CONFIG_SMP
125 struct disk_stats *dkstats;
126#else
127 struct disk_stats dkstats;
128#endif
129};
130
131/* Structure for sysfs attributes on block devices */
132struct disk_attribute {
133 struct attribute attr;
134 ssize_t (*show)(struct gendisk *, char *);
135 ssize_t (*store)(struct gendisk *, const char *, size_t);
136};
137
138/*
139 * Macros to operate on percpu disk statistics:
140 *
141 * The __ variants should only be called in critical sections. The full
142 * variants disable/enable preemption.
143 */
144#ifdef CONFIG_SMP
145#define __disk_stat_add(gendiskp, field, addnd) \
146 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
147
148#define disk_stat_read(gendiskp, field) \
149({ \
150 typeof(gendiskp->dkstats->field) res = 0; \
151 int i; \
152 for (i=0; i < NR_CPUS; i++) { \
153 if (!cpu_possible(i)) \
154 continue; \
155 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
156 } \
157 res; \
158})
159
160static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
161 int i;
162 for (i=0; i < NR_CPUS; i++) {
163 if (cpu_possible(i)) {
164 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
165 sizeof (struct disk_stats));
166 }
167 }
168}
169
170#else
171#define __disk_stat_add(gendiskp, field, addnd) \
172 (gendiskp->dkstats.field += addnd)
173#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
174
175static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
176 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
177}
178#endif
179
180#define disk_stat_add(gendiskp, field, addnd) \
181 do { \
182 preempt_disable(); \
183 __disk_stat_add(gendiskp, field, addnd); \
184 preempt_enable(); \
185 } while (0)
186
187#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
188#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
189
190#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
191#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
192
193#define __disk_stat_sub(gendiskp, field, subnd) \
194 __disk_stat_add(gendiskp, field, -subnd)
195#define disk_stat_sub(gendiskp, field, subnd) \
196 disk_stat_add(gendiskp, field, -subnd)
197
198
199/* Inlines to alloc and free disk stats in struct gendisk */
200#ifdef CONFIG_SMP
201static inline int init_disk_stats(struct gendisk *disk)
202{
203 disk->dkstats = alloc_percpu(struct disk_stats);
204 if (!disk->dkstats)
205 return 0;
206 return 1;
207}
208
209static inline void free_disk_stats(struct gendisk *disk)
210{
211 free_percpu(disk->dkstats);
212}
213#else /* CONFIG_SMP */
214static inline int init_disk_stats(struct gendisk *disk)
215{
216 return 1;
217}
218
219static inline void free_disk_stats(struct gendisk *disk)
220{
221}
222#endif /* CONFIG_SMP */
223
224/* drivers/block/ll_rw_blk.c */
225extern void disk_round_stats(struct gendisk *disk);
226
227/* drivers/block/genhd.c */
228extern int get_blkdev_list(char *, int);
229extern void add_disk(struct gendisk *disk);
230extern void del_gendisk(struct gendisk *gp);
231extern void unlink_gendisk(struct gendisk *gp);
232extern struct gendisk *get_gendisk(dev_t dev, int *part);
233
234extern void set_device_ro(struct block_device *bdev, int flag);
235extern void set_disk_ro(struct gendisk *disk, int flag);
236
237/* drivers/char/random.c */
238extern void add_disk_randomness(struct gendisk *disk);
239extern void rand_initialize_disk(struct gendisk *disk);
240
241static inline sector_t get_start_sect(struct block_device *bdev)
242{
243 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
244}
245static inline sector_t get_capacity(struct gendisk *disk)
246{
247 return disk->capacity;
248}
249static inline void set_capacity(struct gendisk *disk, sector_t size)
250{
251 disk->capacity = size;
252}
253
254#endif /* __KERNEL__ */
255
256#ifdef CONFIG_SOLARIS_X86_PARTITION
257
258#define SOLARIS_X86_NUMSLICE 8
259#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
260
261struct solaris_x86_slice {
262 __le16 s_tag; /* ID tag of partition */
263 __le16 s_flag; /* permission flags */
264 __le32 s_start; /* start sector no of partition */
265 __le32 s_size; /* # of blocks in partition */
266};
267
268struct solaris_x86_vtoc {
269 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
270 __le32 v_sanity; /* to verify vtoc sanity */
271 __le32 v_version; /* layout version */
272 char v_volume[8]; /* volume name */
273 __le16 v_sectorsz; /* sector size in bytes */
274 __le16 v_nparts; /* number of partitions */
275 unsigned int v_reserved[10]; /* free space */
276 struct solaris_x86_slice
277 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
278 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
279 char v_asciilabel[128]; /* for compatibility */
280};
281
282#endif /* CONFIG_SOLARIS_X86_PARTITION */
283
284#ifdef CONFIG_BSD_DISKLABEL
285/*
286 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
287 * updated by Marc Espie <Marc.Espie@openbsd.org>
288 */
289
290/* check against BSD src/sys/sys/disklabel.h for consistency */
291
292#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
293#define BSD_MAXPARTITIONS 16
294#define OPENBSD_MAXPARTITIONS 16
295#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
296struct bsd_disklabel {
297 __le32 d_magic; /* the magic number */
298 __s16 d_type; /* drive type */
299 __s16 d_subtype; /* controller/d_type specific */
300 char d_typename[16]; /* type name, e.g. "eagle" */
301 char d_packname[16]; /* pack identifier */
302 __u32 d_secsize; /* # of bytes per sector */
303 __u32 d_nsectors; /* # of data sectors per track */
304 __u32 d_ntracks; /* # of tracks per cylinder */
305 __u32 d_ncylinders; /* # of data cylinders per unit */
306 __u32 d_secpercyl; /* # of data sectors per cylinder */
307 __u32 d_secperunit; /* # of data sectors per unit */
308 __u16 d_sparespertrack; /* # of spare sectors per track */
309 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
310 __u32 d_acylinders; /* # of alt. cylinders per unit */
311 __u16 d_rpm; /* rotational speed */
312 __u16 d_interleave; /* hardware sector interleave */
313 __u16 d_trackskew; /* sector 0 skew, per track */
314 __u16 d_cylskew; /* sector 0 skew, per cylinder */
315 __u32 d_headswitch; /* head switch time, usec */
316 __u32 d_trkseek; /* track-to-track seek, usec */
317 __u32 d_flags; /* generic flags */
318#define NDDATA 5
319 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
320#define NSPARE 5
321 __u32 d_spare[NSPARE]; /* reserved for future use */
322 __le32 d_magic2; /* the magic number (again) */
323 __le16 d_checksum; /* xor of data incl. partitions */
324
325 /* filesystem and partition information: */
326 __le16 d_npartitions; /* number of partitions in following */
327 __le32 d_bbsize; /* size of boot area at sn0, bytes */
328 __le32 d_sbsize; /* max size of fs superblock, bytes */
329 struct bsd_partition { /* the partition table */
330 __le32 p_size; /* number of sectors in partition */
331 __le32 p_offset; /* starting sector */
332 __le32 p_fsize; /* filesystem basic fragment size */
333 __u8 p_fstype; /* filesystem type, see below */
334 __u8 p_frag; /* filesystem fragments per block */
335 __le16 p_cpg; /* filesystem cylinders per group */
336 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
337};
338
339#endif /* CONFIG_BSD_DISKLABEL */
340
341#ifdef CONFIG_UNIXWARE_DISKLABEL
342/*
343 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
344 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
345 */
346
347#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
348#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
349#define UNIXWARE_NUMSLICE 16
350#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
351
352struct unixware_slice {
353 __le16 s_label; /* label */
354 __le16 s_flags; /* permission flags */
355 __le32 start_sect; /* starting sector */
356 __le32 nr_sects; /* number of sectors in slice */
357};
358
359struct unixware_disklabel {
360 __le32 d_type; /* drive type */
361 __le32 d_magic; /* the magic number */
362 __le32 d_version; /* version number */
363 char d_serial[12]; /* serial number of the device */
364 __le32 d_ncylinders; /* # of data cylinders per device */
365 __le32 d_ntracks; /* # of tracks per cylinder */
366 __le32 d_nsectors; /* # of data sectors per track */
367 __le32 d_secsize; /* # of bytes per sector */
368 __le32 d_part_start; /* # of first sector of this partition */
369 __le32 d_unknown1[12]; /* ? */
370 __le32 d_alt_tbl; /* byte offset of alternate table */
371 __le32 d_alt_len; /* byte length of alternate table */
372 __le32 d_phys_cyl; /* # of physical cylinders per device */
373 __le32 d_phys_trk; /* # of physical tracks per cylinder */
374 __le32 d_phys_sec; /* # of physical sectors per track */
375 __le32 d_phys_bytes; /* # of physical bytes per sector */
376 __le32 d_unknown2; /* ? */
377 __le32 d_unknown3; /* ? */
378 __le32 d_pad[8]; /* pad */
379
380 struct unixware_vtoc {
381 __le32 v_magic; /* the magic number */
382 __le32 v_version; /* version number */
383 char v_name[8]; /* volume name */
384 __le16 v_nslices; /* # of slices */
385 __le16 v_unknown1; /* ? */
386 __le32 v_reserved[10]; /* reserved */
387 struct unixware_slice
388 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
389 } vtoc;
390
391}; /* 408 */
392
393#endif /* CONFIG_UNIXWARE_DISKLABEL */
394
395#ifdef CONFIG_MINIX_SUBPARTITION
396# define MINIX_NR_SUBPARTITIONS 4
397#endif /* CONFIG_MINIX_SUBPARTITION */
398
399#ifdef __KERNEL__
400
401char *disk_name (struct gendisk *hd, int part, char *buf);
402
403extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
404extern void add_partition(struct gendisk *, int, sector_t, sector_t);
405extern void delete_partition(struct gendisk *, int);
406
407extern struct gendisk *alloc_disk_node(int minors, int node_id);
408extern struct gendisk *alloc_disk(int minors);
409extern struct kobject *get_disk(struct gendisk *disk);
410extern void put_disk(struct gendisk *disk);
411
412extern void blk_register_region(dev_t dev, unsigned long range,
413 struct module *module,
414 struct kobject *(*probe)(dev_t, int *, void *),
415 int (*lock)(dev_t, void *),
416 void *data);
417extern void blk_unregister_region(dev_t dev, unsigned long range);
418
419static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
420{
421 return bdget(MKDEV(disk->major, disk->first_minor) + index);
422}
423
424#endif
425
426#endif