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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#include <linux/kdev_t.h>
14
15#ifdef CONFIG_BLOCK
16
17#define kobj_to_dev(k) container_of(k, struct device, kobj)
18#define dev_to_disk(device) container_of(device, struct gendisk, dev)
19#define dev_to_part(device) container_of(device, struct hd_struct, dev)
20
21extern struct device_type disk_type;
22extern struct device_type part_type;
23extern struct kobject *block_depr;
24extern struct class block_class;
25
26enum {
27/* These three have identical behaviour; use the second one if DOS FDISK gets
28 confused about extended/logical partitions starting past cylinder 1023. */
29 DOS_EXTENDED_PARTITION = 5,
30 LINUX_EXTENDED_PARTITION = 0x85,
31 WIN98_EXTENDED_PARTITION = 0x0f,
32
33 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
34
35 LINUX_SWAP_PARTITION = 0x82,
36 LINUX_DATA_PARTITION = 0x83,
37 LINUX_LVM_PARTITION = 0x8e,
38 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
39
40 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
41 NEW_SOLARIS_X86_PARTITION = 0xbf,
42
43 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
44 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
45 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
46 EZD_PARTITION = 0x55, /* EZ-DRIVE */
47
48 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
49 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
50 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
51 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
52 MINIX_PARTITION = 0x81, /* Minix Partition ID */
53 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
54};
55
56#ifndef __KERNEL__
57
58struct partition {
59 unsigned char boot_ind; /* 0x80 - active */
60 unsigned char head; /* starting head */
61 unsigned char sector; /* starting sector */
62 unsigned char cyl; /* starting cylinder */
63 unsigned char sys_ind; /* What partition type */
64 unsigned char end_head; /* end head */
65 unsigned char end_sector; /* end sector */
66 unsigned char end_cyl; /* end cylinder */
67 unsigned int start_sect; /* starting sector counting from 0 */
68 unsigned int nr_sects; /* nr of sectors in partition */
69} __attribute__((packed));
70
71#endif
72
73#ifdef __KERNEL__
74#include <linux/major.h>
75#include <linux/device.h>
76#include <linux/smp.h>
77#include <linux/string.h>
78#include <linux/fs.h>
79#include <linux/workqueue.h>
80
81struct partition {
82 unsigned char boot_ind; /* 0x80 - active */
83 unsigned char head; /* starting head */
84 unsigned char sector; /* starting sector */
85 unsigned char cyl; /* starting cylinder */
86 unsigned char sys_ind; /* What partition type */
87 unsigned char end_head; /* end head */
88 unsigned char end_sector; /* end sector */
89 unsigned char end_cyl; /* end cylinder */
90 __le32 start_sect; /* starting sector counting from 0 */
91 __le32 nr_sects; /* nr of sectors in partition */
92} __attribute__((packed));
93
94struct hd_struct {
95 sector_t start_sect;
96 sector_t nr_sects;
97 struct device dev;
98 struct kobject *holder_dir;
99 unsigned ios[2], sectors[2]; /* READs and WRITEs */
100 int policy, partno;
101#ifdef CONFIG_FAIL_MAKE_REQUEST
102 int make_it_fail;
103#endif
104};
105
106#define GENHD_FL_REMOVABLE 1
107#define GENHD_FL_DRIVERFS 2
108#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
109#define GENHD_FL_CD 8
110#define GENHD_FL_UP 16
111#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
112#define GENHD_FL_FAIL 64
113
114struct disk_stats {
115 unsigned long sectors[2]; /* READs and WRITEs */
116 unsigned long ios[2];
117 unsigned long merges[2];
118 unsigned long ticks[2];
119 unsigned long io_ticks;
120 unsigned long time_in_queue;
121};
122
123struct gendisk {
124 int major; /* major number of driver */
125 int first_minor;
126 int minors; /* maximum number of minors, =1 for
127 * disks that can't be partitioned. */
128 char disk_name[32]; /* name of major driver */
129 struct hd_struct **part; /* [indexed by minor] */
130 struct block_device_operations *fops;
131 struct request_queue *queue;
132 void *private_data;
133 sector_t capacity;
134
135 int flags;
136 struct device *driverfs_dev; // FIXME: remove
137 struct device dev;
138 struct kobject *holder_dir;
139 struct kobject *slave_dir;
140
141 struct timer_rand_state *random;
142 int policy;
143
144 atomic_t sync_io; /* RAID */
145 unsigned long stamp;
146 int in_flight;
147#ifdef CONFIG_SMP
148 struct disk_stats *dkstats;
149#else
150 struct disk_stats dkstats;
151#endif
152 struct work_struct async_notify;
153};
154
155/*
156 * Macros to operate on percpu disk statistics:
157 *
158 * The __ variants should only be called in critical sections. The full
159 * variants disable/enable preemption.
160 */
161#ifdef CONFIG_SMP
162#define __disk_stat_add(gendiskp, field, addnd) \
163 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
164
165#define disk_stat_read(gendiskp, field) \
166({ \
167 typeof(gendiskp->dkstats->field) res = 0; \
168 int i; \
169 for_each_possible_cpu(i) \
170 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
171 res; \
172})
173
174static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
175 int i;
176 for_each_possible_cpu(i)
177 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
178 sizeof (struct disk_stats));
179}
180
181#else
182#define __disk_stat_add(gendiskp, field, addnd) \
183 (gendiskp->dkstats.field += addnd)
184#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
185
186static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
187 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
188}
189#endif
190
191#define disk_stat_add(gendiskp, field, addnd) \
192 do { \
193 preempt_disable(); \
194 __disk_stat_add(gendiskp, field, addnd); \
195 preempt_enable(); \
196 } while (0)
197
198#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
199#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
200
201#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
202#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
203
204#define __disk_stat_sub(gendiskp, field, subnd) \
205 __disk_stat_add(gendiskp, field, -subnd)
206#define disk_stat_sub(gendiskp, field, subnd) \
207 disk_stat_add(gendiskp, field, -subnd)
208
209
210/* Inlines to alloc and free disk stats in struct gendisk */
211#ifdef CONFIG_SMP
212static inline int init_disk_stats(struct gendisk *disk)
213{
214 disk->dkstats = alloc_percpu(struct disk_stats);
215 if (!disk->dkstats)
216 return 0;
217 return 1;
218}
219
220static inline void free_disk_stats(struct gendisk *disk)
221{
222 free_percpu(disk->dkstats);
223}
224#else /* CONFIG_SMP */
225static inline int init_disk_stats(struct gendisk *disk)
226{
227 return 1;
228}
229
230static inline void free_disk_stats(struct gendisk *disk)
231{
232}
233#endif /* CONFIG_SMP */
234
235/* drivers/block/ll_rw_blk.c */
236extern void disk_round_stats(struct gendisk *disk);
237
238/* drivers/block/genhd.c */
239extern int get_blkdev_list(char *, int);
240extern void add_disk(struct gendisk *disk);
241extern void del_gendisk(struct gendisk *gp);
242extern void unlink_gendisk(struct gendisk *gp);
243extern struct gendisk *get_gendisk(dev_t dev, int *part);
244
245extern void set_device_ro(struct block_device *bdev, int flag);
246extern void set_disk_ro(struct gendisk *disk, int flag);
247
248/* drivers/char/random.c */
249extern void add_disk_randomness(struct gendisk *disk);
250extern void rand_initialize_disk(struct gendisk *disk);
251
252static inline sector_t get_start_sect(struct block_device *bdev)
253{
254 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
255}
256static inline sector_t get_capacity(struct gendisk *disk)
257{
258 return disk->capacity;
259}
260static inline void set_capacity(struct gendisk *disk, sector_t size)
261{
262 disk->capacity = size;
263}
264
265#endif /* __KERNEL__ */
266
267#ifdef CONFIG_SOLARIS_X86_PARTITION
268
269#define SOLARIS_X86_NUMSLICE 16
270#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
271
272struct solaris_x86_slice {
273 __le16 s_tag; /* ID tag of partition */
274 __le16 s_flag; /* permission flags */
275 __le32 s_start; /* start sector no of partition */
276 __le32 s_size; /* # of blocks in partition */
277};
278
279struct solaris_x86_vtoc {
280 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
281 __le32 v_sanity; /* to verify vtoc sanity */
282 __le32 v_version; /* layout version */
283 char v_volume[8]; /* volume name */
284 __le16 v_sectorsz; /* sector size in bytes */
285 __le16 v_nparts; /* number of partitions */
286 unsigned int v_reserved[10]; /* free space */
287 struct solaris_x86_slice
288 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
289 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
290 char v_asciilabel[128]; /* for compatibility */
291};
292
293#endif /* CONFIG_SOLARIS_X86_PARTITION */
294
295#ifdef CONFIG_BSD_DISKLABEL
296/*
297 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
298 * updated by Marc Espie <Marc.Espie@openbsd.org>
299 */
300
301/* check against BSD src/sys/sys/disklabel.h for consistency */
302
303#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
304#define BSD_MAXPARTITIONS 16
305#define OPENBSD_MAXPARTITIONS 16
306#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
307struct bsd_disklabel {
308 __le32 d_magic; /* the magic number */
309 __s16 d_type; /* drive type */
310 __s16 d_subtype; /* controller/d_type specific */
311 char d_typename[16]; /* type name, e.g. "eagle" */
312 char d_packname[16]; /* pack identifier */
313 __u32 d_secsize; /* # of bytes per sector */
314 __u32 d_nsectors; /* # of data sectors per track */
315 __u32 d_ntracks; /* # of tracks per cylinder */
316 __u32 d_ncylinders; /* # of data cylinders per unit */
317 __u32 d_secpercyl; /* # of data sectors per cylinder */
318 __u32 d_secperunit; /* # of data sectors per unit */
319 __u16 d_sparespertrack; /* # of spare sectors per track */
320 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
321 __u32 d_acylinders; /* # of alt. cylinders per unit */
322 __u16 d_rpm; /* rotational speed */
323 __u16 d_interleave; /* hardware sector interleave */
324 __u16 d_trackskew; /* sector 0 skew, per track */
325 __u16 d_cylskew; /* sector 0 skew, per cylinder */
326 __u32 d_headswitch; /* head switch time, usec */
327 __u32 d_trkseek; /* track-to-track seek, usec */
328 __u32 d_flags; /* generic flags */
329#define NDDATA 5
330 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
331#define NSPARE 5
332 __u32 d_spare[NSPARE]; /* reserved for future use */
333 __le32 d_magic2; /* the magic number (again) */
334 __le16 d_checksum; /* xor of data incl. partitions */
335
336 /* filesystem and partition information: */
337 __le16 d_npartitions; /* number of partitions in following */
338 __le32 d_bbsize; /* size of boot area at sn0, bytes */
339 __le32 d_sbsize; /* max size of fs superblock, bytes */
340 struct bsd_partition { /* the partition table */
341 __le32 p_size; /* number of sectors in partition */
342 __le32 p_offset; /* starting sector */
343 __le32 p_fsize; /* filesystem basic fragment size */
344 __u8 p_fstype; /* filesystem type, see below */
345 __u8 p_frag; /* filesystem fragments per block */
346 __le16 p_cpg; /* filesystem cylinders per group */
347 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
348};
349
350#endif /* CONFIG_BSD_DISKLABEL */
351
352#ifdef CONFIG_UNIXWARE_DISKLABEL
353/*
354 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
355 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
356 */
357
358#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
359#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
360#define UNIXWARE_NUMSLICE 16
361#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
362
363struct unixware_slice {
364 __le16 s_label; /* label */
365 __le16 s_flags; /* permission flags */
366 __le32 start_sect; /* starting sector */
367 __le32 nr_sects; /* number of sectors in slice */
368};
369
370struct unixware_disklabel {
371 __le32 d_type; /* drive type */
372 __le32 d_magic; /* the magic number */
373 __le32 d_version; /* version number */
374 char d_serial[12]; /* serial number of the device */
375 __le32 d_ncylinders; /* # of data cylinders per device */
376 __le32 d_ntracks; /* # of tracks per cylinder */
377 __le32 d_nsectors; /* # of data sectors per track */
378 __le32 d_secsize; /* # of bytes per sector */
379 __le32 d_part_start; /* # of first sector of this partition */
380 __le32 d_unknown1[12]; /* ? */
381 __le32 d_alt_tbl; /* byte offset of alternate table */
382 __le32 d_alt_len; /* byte length of alternate table */
383 __le32 d_phys_cyl; /* # of physical cylinders per device */
384 __le32 d_phys_trk; /* # of physical tracks per cylinder */
385 __le32 d_phys_sec; /* # of physical sectors per track */
386 __le32 d_phys_bytes; /* # of physical bytes per sector */
387 __le32 d_unknown2; /* ? */
388 __le32 d_unknown3; /* ? */
389 __le32 d_pad[8]; /* pad */
390
391 struct unixware_vtoc {
392 __le32 v_magic; /* the magic number */
393 __le32 v_version; /* version number */
394 char v_name[8]; /* volume name */
395 __le16 v_nslices; /* # of slices */
396 __le16 v_unknown1; /* ? */
397 __le32 v_reserved[10]; /* reserved */
398 struct unixware_slice
399 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
400 } vtoc;
401
402}; /* 408 */
403
404#endif /* CONFIG_UNIXWARE_DISKLABEL */
405
406#ifdef CONFIG_MINIX_SUBPARTITION
407# define MINIX_NR_SUBPARTITIONS 4
408#endif /* CONFIG_MINIX_SUBPARTITION */
409
410#ifdef __KERNEL__
411
412#define ADDPART_FLAG_NONE 0
413#define ADDPART_FLAG_RAID 1
414#define ADDPART_FLAG_WHOLEDISK 2
415
416extern dev_t blk_lookup_devt(const char *name);
417extern char *disk_name (struct gendisk *hd, int part, char *buf);
418
419extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
420extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
421extern void delete_partition(struct gendisk *, int);
422extern void printk_all_partitions(void);
423
424extern struct gendisk *alloc_disk_node(int minors, int node_id);
425extern struct gendisk *alloc_disk(int minors);
426extern struct kobject *get_disk(struct gendisk *disk);
427extern void put_disk(struct gendisk *disk);
428extern void genhd_media_change_notify(struct gendisk *disk);
429extern void blk_register_region(dev_t devt, unsigned long range,
430 struct module *module,
431 struct kobject *(*probe)(dev_t, int *, void *),
432 int (*lock)(dev_t, void *),
433 void *data);
434extern void blk_unregister_region(dev_t devt, unsigned long range);
435
436static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
437{
438 return bdget(MKDEV(disk->major, disk->first_minor) + index);
439}
440
441#endif
442
443#else /* CONFIG_BLOCK */
444
445static inline void printk_all_partitions(void) { }
446
447static inline dev_t blk_lookup_devt(const char *name)
448{
449 dev_t devt = MKDEV(0, 0);
450 return devt;
451}
452
453#endif /* CONFIG_BLOCK */
454
455#endif