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