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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 reads, read_sectors, writes, write_sectors;
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 read_sectors, write_sectors;
93 unsigned reads, writes;
94 unsigned read_merges, write_merges;
95 unsigned read_ticks, write_ticks;
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, stamp_idle;
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};
136
137/*
138 * Macros to operate on percpu disk statistics:
139 *
140 * The __ variants should only be called in critical sections. The full
141 * variants disable/enable preemption.
142 */
143#ifdef CONFIG_SMP
144#define __disk_stat_add(gendiskp, field, addnd) \
145 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
146
147#define disk_stat_read(gendiskp, field) \
148({ \
149 typeof(gendiskp->dkstats->field) res = 0; \
150 int i; \
151 for (i=0; i < NR_CPUS; i++) { \
152 if (!cpu_possible(i)) \
153 continue; \
154 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
155 } \
156 res; \
157})
158
159static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
160 int i;
161 for (i=0; i < NR_CPUS; i++) {
162 if (cpu_possible(i)) {
163 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
164 sizeof (struct disk_stats));
165 }
166 }
167}
168
169#else
170#define __disk_stat_add(gendiskp, field, addnd) \
171 (gendiskp->dkstats.field += addnd)
172#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
173
174static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
175 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
176}
177#endif
178
179#define disk_stat_add(gendiskp, field, addnd) \
180 do { \
181 preempt_disable(); \
182 __disk_stat_add(gendiskp, field, addnd); \
183 preempt_enable(); \
184 } while (0)
185
186#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
187#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
188
189#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
190#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
191
192#define __disk_stat_sub(gendiskp, field, subnd) \
193 __disk_stat_add(gendiskp, field, -subnd)
194#define disk_stat_sub(gendiskp, field, subnd) \
195 disk_stat_add(gendiskp, field, -subnd)
196
197
198/* Inlines to alloc and free disk stats in struct gendisk */
199#ifdef CONFIG_SMP
200static inline int init_disk_stats(struct gendisk *disk)
201{
202 disk->dkstats = alloc_percpu(struct disk_stats);
203 if (!disk->dkstats)
204 return 0;
205 return 1;
206}
207
208static inline void free_disk_stats(struct gendisk *disk)
209{
210 free_percpu(disk->dkstats);
211}
212#else /* CONFIG_SMP */
213static inline int init_disk_stats(struct gendisk *disk)
214{
215 return 1;
216}
217
218static inline void free_disk_stats(struct gendisk *disk)
219{
220}
221#endif /* CONFIG_SMP */
222
223/* drivers/block/ll_rw_blk.c */
224extern void disk_round_stats(struct gendisk *disk);
225
226/* drivers/block/genhd.c */
227extern int get_blkdev_list(char *, int);
228extern void add_disk(struct gendisk *disk);
229extern void del_gendisk(struct gendisk *gp);
230extern void unlink_gendisk(struct gendisk *gp);
231extern struct gendisk *get_gendisk(dev_t dev, int *part);
232
233extern void set_device_ro(struct block_device *bdev, int flag);
234extern void set_disk_ro(struct gendisk *disk, int flag);
235
236/* drivers/char/random.c */
237extern void add_disk_randomness(struct gendisk *disk);
238extern void rand_initialize_disk(struct gendisk *disk);
239
240static inline sector_t get_start_sect(struct block_device *bdev)
241{
242 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
243}
244static inline sector_t get_capacity(struct gendisk *disk)
245{
246 return disk->capacity;
247}
248static inline void set_capacity(struct gendisk *disk, sector_t size)
249{
250 disk->capacity = size;
251}
252
253#endif /* __KERNEL__ */
254
255#ifdef CONFIG_SOLARIS_X86_PARTITION
256
257#define SOLARIS_X86_NUMSLICE 8
258#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
259
260struct solaris_x86_slice {
261 __le16 s_tag; /* ID tag of partition */
262 __le16 s_flag; /* permission flags */
263 __le32 s_start; /* start sector no of partition */
264 __le32 s_size; /* # of blocks in partition */
265};
266
267struct solaris_x86_vtoc {
268 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
269 __le32 v_sanity; /* to verify vtoc sanity */
270 __le32 v_version; /* layout version */
271 char v_volume[8]; /* volume name */
272 __le16 v_sectorsz; /* sector size in bytes */
273 __le16 v_nparts; /* number of partitions */
274 unsigned int v_reserved[10]; /* free space */
275 struct solaris_x86_slice
276 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
277 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
278 char v_asciilabel[128]; /* for compatibility */
279};
280
281#endif /* CONFIG_SOLARIS_X86_PARTITION */
282
283#ifdef CONFIG_BSD_DISKLABEL
284/*
285 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
286 * updated by Marc Espie <Marc.Espie@openbsd.org>
287 */
288
289/* check against BSD src/sys/sys/disklabel.h for consistency */
290
291#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
292#define BSD_MAXPARTITIONS 16
293#define OPENBSD_MAXPARTITIONS 16
294#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
295struct bsd_disklabel {
296 __le32 d_magic; /* the magic number */
297 __s16 d_type; /* drive type */
298 __s16 d_subtype; /* controller/d_type specific */
299 char d_typename[16]; /* type name, e.g. "eagle" */
300 char d_packname[16]; /* pack identifier */
301 __u32 d_secsize; /* # of bytes per sector */
302 __u32 d_nsectors; /* # of data sectors per track */
303 __u32 d_ntracks; /* # of tracks per cylinder */
304 __u32 d_ncylinders; /* # of data cylinders per unit */
305 __u32 d_secpercyl; /* # of data sectors per cylinder */
306 __u32 d_secperunit; /* # of data sectors per unit */
307 __u16 d_sparespertrack; /* # of spare sectors per track */
308 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
309 __u32 d_acylinders; /* # of alt. cylinders per unit */
310 __u16 d_rpm; /* rotational speed */
311 __u16 d_interleave; /* hardware sector interleave */
312 __u16 d_trackskew; /* sector 0 skew, per track */
313 __u16 d_cylskew; /* sector 0 skew, per cylinder */
314 __u32 d_headswitch; /* head switch time, usec */
315 __u32 d_trkseek; /* track-to-track seek, usec */
316 __u32 d_flags; /* generic flags */
317#define NDDATA 5
318 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
319#define NSPARE 5
320 __u32 d_spare[NSPARE]; /* reserved for future use */
321 __le32 d_magic2; /* the magic number (again) */
322 __le16 d_checksum; /* xor of data incl. partitions */
323
324 /* filesystem and partition information: */
325 __le16 d_npartitions; /* number of partitions in following */
326 __le32 d_bbsize; /* size of boot area at sn0, bytes */
327 __le32 d_sbsize; /* max size of fs superblock, bytes */
328 struct bsd_partition { /* the partition table */
329 __le32 p_size; /* number of sectors in partition */
330 __le32 p_offset; /* starting sector */
331 __le32 p_fsize; /* filesystem basic fragment size */
332 __u8 p_fstype; /* filesystem type, see below */
333 __u8 p_frag; /* filesystem fragments per block */
334 __le16 p_cpg; /* filesystem cylinders per group */
335 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
336};
337
338#endif /* CONFIG_BSD_DISKLABEL */
339
340#ifdef CONFIG_UNIXWARE_DISKLABEL
341/*
342 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
343 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
344 */
345
346#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
347#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
348#define UNIXWARE_NUMSLICE 16
349#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
350
351struct unixware_slice {
352 __le16 s_label; /* label */
353 __le16 s_flags; /* permission flags */
354 __le32 start_sect; /* starting sector */
355 __le32 nr_sects; /* number of sectors in slice */
356};
357
358struct unixware_disklabel {
359 __le32 d_type; /* drive type */
360 __le32 d_magic; /* the magic number */
361 __le32 d_version; /* version number */
362 char d_serial[12]; /* serial number of the device */
363 __le32 d_ncylinders; /* # of data cylinders per device */
364 __le32 d_ntracks; /* # of tracks per cylinder */
365 __le32 d_nsectors; /* # of data sectors per track */
366 __le32 d_secsize; /* # of bytes per sector */
367 __le32 d_part_start; /* # of first sector of this partition */
368 __le32 d_unknown1[12]; /* ? */
369 __le32 d_alt_tbl; /* byte offset of alternate table */
370 __le32 d_alt_len; /* byte length of alternate table */
371 __le32 d_phys_cyl; /* # of physical cylinders per device */
372 __le32 d_phys_trk; /* # of physical tracks per cylinder */
373 __le32 d_phys_sec; /* # of physical sectors per track */
374 __le32 d_phys_bytes; /* # of physical bytes per sector */
375 __le32 d_unknown2; /* ? */
376 __le32 d_unknown3; /* ? */
377 __le32 d_pad[8]; /* pad */
378
379 struct unixware_vtoc {
380 __le32 v_magic; /* the magic number */
381 __le32 v_version; /* version number */
382 char v_name[8]; /* volume name */
383 __le16 v_nslices; /* # of slices */
384 __le16 v_unknown1; /* ? */
385 __le32 v_reserved[10]; /* reserved */
386 struct unixware_slice
387 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
388 } vtoc;
389
390}; /* 408 */
391
392#endif /* CONFIG_UNIXWARE_DISKLABEL */
393
394#ifdef CONFIG_MINIX_SUBPARTITION
395# define MINIX_NR_SUBPARTITIONS 4
396#endif /* CONFIG_MINIX_SUBPARTITION */
397
398#ifdef __KERNEL__
399
400char *disk_name (struct gendisk *hd, int part, char *buf);
401
402extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
403extern void add_partition(struct gendisk *, int, sector_t, sector_t);
404extern void delete_partition(struct gendisk *, int);
405
406extern struct gendisk *alloc_disk_node(int minors, int node_id);
407extern struct gendisk *alloc_disk(int minors);
408extern struct kobject *get_disk(struct gendisk *disk);
409extern void put_disk(struct gendisk *disk);
410
411extern void blk_register_region(dev_t dev, unsigned long range,
412 struct module *module,
413 struct kobject *(*probe)(dev_t, int *, void *),
414 int (*lock)(dev_t, void *),
415 void *data);
416extern void blk_unregister_region(dev_t dev, unsigned long range);
417
418static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
419{
420 return bdget(MKDEV(disk->major, disk->first_minor) + index);
421}
422
423#endif
424
425#endif