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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 part_type;
22extern struct kobject *block_depr;
23extern struct class block_class;
24
25extern const struct seq_operations partitions_op;
26extern const struct seq_operations diskstats_op;
27
28enum {
29/* These three have identical behaviour; use the second one if DOS FDISK gets
30 confused about extended/logical partitions starting past cylinder 1023. */
31 DOS_EXTENDED_PARTITION = 5,
32 LINUX_EXTENDED_PARTITION = 0x85,
33 WIN98_EXTENDED_PARTITION = 0x0f,
34
35 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
36
37 LINUX_SWAP_PARTITION = 0x82,
38 LINUX_DATA_PARTITION = 0x83,
39 LINUX_LVM_PARTITION = 0x8e,
40 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
41
42 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
43 NEW_SOLARIS_X86_PARTITION = 0xbf,
44
45 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
46 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
47 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
48 EZD_PARTITION = 0x55, /* EZ-DRIVE */
49
50 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
51 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
52 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
53 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
54 MINIX_PARTITION = 0x81, /* Minix Partition ID */
55 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
56};
57
58#include <linux/major.h>
59#include <linux/device.h>
60#include <linux/smp.h>
61#include <linux/string.h>
62#include <linux/fs.h>
63#include <linux/workqueue.h>
64
65struct partition {
66 unsigned char boot_ind; /* 0x80 - active */
67 unsigned char head; /* starting head */
68 unsigned char sector; /* starting sector */
69 unsigned char cyl; /* starting cylinder */
70 unsigned char sys_ind; /* What partition type */
71 unsigned char end_head; /* end head */
72 unsigned char end_sector; /* end sector */
73 unsigned char end_cyl; /* end cylinder */
74 __le32 start_sect; /* starting sector counting from 0 */
75 __le32 nr_sects; /* nr of sectors in partition */
76} __attribute__((packed));
77
78struct disk_stats {
79 unsigned long sectors[2]; /* READs and WRITEs */
80 unsigned long ios[2];
81 unsigned long merges[2];
82 unsigned long ticks[2];
83 unsigned long io_ticks;
84 unsigned long time_in_queue;
85};
86
87struct hd_struct {
88 sector_t start_sect;
89 sector_t nr_sects;
90 struct device dev;
91 struct kobject *holder_dir;
92 int policy, partno;
93#ifdef CONFIG_FAIL_MAKE_REQUEST
94 int make_it_fail;
95#endif
96 unsigned long stamp;
97 int in_flight;
98#ifdef CONFIG_SMP
99 struct disk_stats *dkstats;
100#else
101 struct disk_stats dkstats;
102#endif
103};
104
105#define GENHD_FL_REMOVABLE 1
106#define GENHD_FL_DRIVERFS 2
107#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
108#define GENHD_FL_CD 8
109#define GENHD_FL_UP 16
110#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
111#define GENHD_FL_FAIL 64
112
113
114struct gendisk {
115 int major; /* major number of driver */
116 int first_minor;
117 int minors; /* maximum number of minors, =1 for
118 * disks that can't be partitioned. */
119 char disk_name[32]; /* name of major driver */
120 struct hd_struct **part; /* [indexed by minor] */
121 struct block_device_operations *fops;
122 struct request_queue *queue;
123 void *private_data;
124 sector_t capacity;
125
126 int flags;
127 struct device *driverfs_dev; // FIXME: remove
128 struct device dev;
129 struct kobject *holder_dir;
130 struct kobject *slave_dir;
131
132 struct timer_rand_state *random;
133 int policy;
134
135 atomic_t sync_io; /* RAID */
136 unsigned long stamp;
137 int in_flight;
138#ifdef CONFIG_SMP
139 struct disk_stats *dkstats;
140#else
141 struct disk_stats dkstats;
142#endif
143 struct work_struct async_notify;
144};
145
146/*
147 * Macros to operate on percpu disk statistics:
148 *
149 * The __ variants should only be called in critical sections. The full
150 * variants disable/enable preemption.
151 */
152static inline struct hd_struct *get_part(struct gendisk *gendiskp,
153 sector_t sector)
154{
155 struct hd_struct *part;
156 int i;
157 for (i = 0; i < gendiskp->minors - 1; i++) {
158 part = gendiskp->part[i];
159 if (part && part->start_sect <= sector
160 && sector < part->start_sect + part->nr_sects)
161 return part;
162 }
163 return NULL;
164}
165
166#ifdef CONFIG_SMP
167#define __disk_stat_add(gendiskp, field, addnd) \
168 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
169
170#define disk_stat_read(gendiskp, field) \
171({ \
172 typeof(gendiskp->dkstats->field) res = 0; \
173 int i; \
174 for_each_possible_cpu(i) \
175 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
176 res; \
177})
178
179static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
180 int i;
181 for_each_possible_cpu(i)
182 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
183 sizeof (struct disk_stats));
184}
185
186#define __part_stat_add(part, field, addnd) \
187 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
188
189#define __all_stat_add(gendiskp, field, addnd, sector) \
190({ \
191 struct hd_struct *part = get_part(gendiskp, sector); \
192 if (part) \
193 __part_stat_add(part, field, addnd); \
194 __disk_stat_add(gendiskp, field, addnd); \
195})
196
197#define part_stat_read(part, field) \
198({ \
199 typeof(part->dkstats->field) res = 0; \
200 int i; \
201 for_each_possible_cpu(i) \
202 res += per_cpu_ptr(part->dkstats, i)->field; \
203 res; \
204})
205
206static inline void part_stat_set_all(struct hd_struct *part, int value) {
207 int i;
208 for_each_possible_cpu(i)
209 memset(per_cpu_ptr(part->dkstats, i), value,
210 sizeof(struct disk_stats));
211}
212
213#else /* !CONFIG_SMP */
214#define __disk_stat_add(gendiskp, field, addnd) \
215 (gendiskp->dkstats.field += addnd)
216#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
217
218static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
219{
220 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
221}
222
223#define __part_stat_add(part, field, addnd) \
224 (part->dkstats.field += addnd)
225
226#define __all_stat_add(gendiskp, field, addnd, sector) \
227({ \
228 struct hd_struct *part = get_part(gendiskp, sector); \
229 if (part) \
230 part->dkstats.field += addnd; \
231 __disk_stat_add(gendiskp, field, addnd); \
232})
233
234#define part_stat_read(part, field) (part->dkstats.field)
235
236static inline void part_stat_set_all(struct hd_struct *part, int value)
237{
238 memset(&part->dkstats, value, sizeof(struct disk_stats));
239}
240
241#endif /* CONFIG_SMP */
242
243#define disk_stat_add(gendiskp, field, addnd) \
244 do { \
245 preempt_disable(); \
246 __disk_stat_add(gendiskp, field, addnd); \
247 preempt_enable(); \
248 } while (0)
249
250#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
251#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
252
253#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
254#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
255
256#define __disk_stat_sub(gendiskp, field, subnd) \
257 __disk_stat_add(gendiskp, field, -subnd)
258#define disk_stat_sub(gendiskp, field, subnd) \
259 disk_stat_add(gendiskp, field, -subnd)
260
261#define part_stat_add(gendiskp, field, addnd) \
262 do { \
263 preempt_disable(); \
264 __part_stat_add(gendiskp, field, addnd);\
265 preempt_enable(); \
266 } while (0)
267
268#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
269#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
270
271#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
272#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
273
274#define __part_stat_sub(gendiskp, field, subnd) \
275 __part_stat_add(gendiskp, field, -subnd)
276#define part_stat_sub(gendiskp, field, subnd) \
277 part_stat_add(gendiskp, field, -subnd)
278
279#define all_stat_add(gendiskp, field, addnd, sector) \
280 do { \
281 preempt_disable(); \
282 __all_stat_add(gendiskp, field, addnd, sector); \
283 preempt_enable(); \
284 } while (0)
285
286#define __all_stat_dec(gendiskp, field, sector) \
287 __all_stat_add(gendiskp, field, -1, sector)
288#define all_stat_dec(gendiskp, field, sector) \
289 all_stat_add(gendiskp, field, -1, sector)
290
291#define __all_stat_inc(gendiskp, field, sector) \
292 __all_stat_add(gendiskp, field, 1, sector)
293#define all_stat_inc(gendiskp, field, sector) \
294 all_stat_add(gendiskp, field, 1, sector)
295
296#define __all_stat_sub(gendiskp, field, subnd, sector) \
297 __all_stat_add(gendiskp, field, -subnd, sector)
298#define all_stat_sub(gendiskp, field, subnd, sector) \
299 all_stat_add(gendiskp, field, -subnd, sector)
300
301/* Inlines to alloc and free disk stats in struct gendisk */
302#ifdef CONFIG_SMP
303static inline int init_disk_stats(struct gendisk *disk)
304{
305 disk->dkstats = alloc_percpu(struct disk_stats);
306 if (!disk->dkstats)
307 return 0;
308 return 1;
309}
310
311static inline void free_disk_stats(struct gendisk *disk)
312{
313 free_percpu(disk->dkstats);
314}
315
316static inline int init_part_stats(struct hd_struct *part)
317{
318 part->dkstats = alloc_percpu(struct disk_stats);
319 if (!part->dkstats)
320 return 0;
321 return 1;
322}
323
324static inline void free_part_stats(struct hd_struct *part)
325{
326 free_percpu(part->dkstats);
327}
328
329#else /* CONFIG_SMP */
330static inline int init_disk_stats(struct gendisk *disk)
331{
332 return 1;
333}
334
335static inline void free_disk_stats(struct gendisk *disk)
336{
337}
338
339static inline int init_part_stats(struct hd_struct *part)
340{
341 return 1;
342}
343
344static inline void free_part_stats(struct hd_struct *part)
345{
346}
347#endif /* CONFIG_SMP */
348
349/* drivers/block/ll_rw_blk.c */
350extern void disk_round_stats(struct gendisk *disk);
351extern void part_round_stats(struct hd_struct *part);
352
353/* drivers/block/genhd.c */
354extern int get_blkdev_list(char *, int);
355extern void add_disk(struct gendisk *disk);
356extern void del_gendisk(struct gendisk *gp);
357extern void unlink_gendisk(struct gendisk *gp);
358extern struct gendisk *get_gendisk(dev_t dev, int *part);
359
360extern void set_device_ro(struct block_device *bdev, int flag);
361extern void set_disk_ro(struct gendisk *disk, int flag);
362
363/* drivers/char/random.c */
364extern void add_disk_randomness(struct gendisk *disk);
365extern void rand_initialize_disk(struct gendisk *disk);
366
367static inline sector_t get_start_sect(struct block_device *bdev)
368{
369 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
370}
371static inline sector_t get_capacity(struct gendisk *disk)
372{
373 return disk->capacity;
374}
375static inline void set_capacity(struct gendisk *disk, sector_t size)
376{
377 disk->capacity = size;
378}
379
380#ifdef CONFIG_SOLARIS_X86_PARTITION
381
382#define SOLARIS_X86_NUMSLICE 16
383#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
384
385struct solaris_x86_slice {
386 __le16 s_tag; /* ID tag of partition */
387 __le16 s_flag; /* permission flags */
388 __le32 s_start; /* start sector no of partition */
389 __le32 s_size; /* # of blocks in partition */
390};
391
392struct solaris_x86_vtoc {
393 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
394 __le32 v_sanity; /* to verify vtoc sanity */
395 __le32 v_version; /* layout version */
396 char v_volume[8]; /* volume name */
397 __le16 v_sectorsz; /* sector size in bytes */
398 __le16 v_nparts; /* number of partitions */
399 unsigned int v_reserved[10]; /* free space */
400 struct solaris_x86_slice
401 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
402 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
403 char v_asciilabel[128]; /* for compatibility */
404};
405
406#endif /* CONFIG_SOLARIS_X86_PARTITION */
407
408#ifdef CONFIG_BSD_DISKLABEL
409/*
410 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
411 * updated by Marc Espie <Marc.Espie@openbsd.org>
412 */
413
414/* check against BSD src/sys/sys/disklabel.h for consistency */
415
416#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
417#define BSD_MAXPARTITIONS 16
418#define OPENBSD_MAXPARTITIONS 16
419#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
420struct bsd_disklabel {
421 __le32 d_magic; /* the magic number */
422 __s16 d_type; /* drive type */
423 __s16 d_subtype; /* controller/d_type specific */
424 char d_typename[16]; /* type name, e.g. "eagle" */
425 char d_packname[16]; /* pack identifier */
426 __u32 d_secsize; /* # of bytes per sector */
427 __u32 d_nsectors; /* # of data sectors per track */
428 __u32 d_ntracks; /* # of tracks per cylinder */
429 __u32 d_ncylinders; /* # of data cylinders per unit */
430 __u32 d_secpercyl; /* # of data sectors per cylinder */
431 __u32 d_secperunit; /* # of data sectors per unit */
432 __u16 d_sparespertrack; /* # of spare sectors per track */
433 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
434 __u32 d_acylinders; /* # of alt. cylinders per unit */
435 __u16 d_rpm; /* rotational speed */
436 __u16 d_interleave; /* hardware sector interleave */
437 __u16 d_trackskew; /* sector 0 skew, per track */
438 __u16 d_cylskew; /* sector 0 skew, per cylinder */
439 __u32 d_headswitch; /* head switch time, usec */
440 __u32 d_trkseek; /* track-to-track seek, usec */
441 __u32 d_flags; /* generic flags */
442#define NDDATA 5
443 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
444#define NSPARE 5
445 __u32 d_spare[NSPARE]; /* reserved for future use */
446 __le32 d_magic2; /* the magic number (again) */
447 __le16 d_checksum; /* xor of data incl. partitions */
448
449 /* filesystem and partition information: */
450 __le16 d_npartitions; /* number of partitions in following */
451 __le32 d_bbsize; /* size of boot area at sn0, bytes */
452 __le32 d_sbsize; /* max size of fs superblock, bytes */
453 struct bsd_partition { /* the partition table */
454 __le32 p_size; /* number of sectors in partition */
455 __le32 p_offset; /* starting sector */
456 __le32 p_fsize; /* filesystem basic fragment size */
457 __u8 p_fstype; /* filesystem type, see below */
458 __u8 p_frag; /* filesystem fragments per block */
459 __le16 p_cpg; /* filesystem cylinders per group */
460 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
461};
462
463#endif /* CONFIG_BSD_DISKLABEL */
464
465#ifdef CONFIG_UNIXWARE_DISKLABEL
466/*
467 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
468 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
469 */
470
471#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
472#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
473#define UNIXWARE_NUMSLICE 16
474#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
475
476struct unixware_slice {
477 __le16 s_label; /* label */
478 __le16 s_flags; /* permission flags */
479 __le32 start_sect; /* starting sector */
480 __le32 nr_sects; /* number of sectors in slice */
481};
482
483struct unixware_disklabel {
484 __le32 d_type; /* drive type */
485 __le32 d_magic; /* the magic number */
486 __le32 d_version; /* version number */
487 char d_serial[12]; /* serial number of the device */
488 __le32 d_ncylinders; /* # of data cylinders per device */
489 __le32 d_ntracks; /* # of tracks per cylinder */
490 __le32 d_nsectors; /* # of data sectors per track */
491 __le32 d_secsize; /* # of bytes per sector */
492 __le32 d_part_start; /* # of first sector of this partition */
493 __le32 d_unknown1[12]; /* ? */
494 __le32 d_alt_tbl; /* byte offset of alternate table */
495 __le32 d_alt_len; /* byte length of alternate table */
496 __le32 d_phys_cyl; /* # of physical cylinders per device */
497 __le32 d_phys_trk; /* # of physical tracks per cylinder */
498 __le32 d_phys_sec; /* # of physical sectors per track */
499 __le32 d_phys_bytes; /* # of physical bytes per sector */
500 __le32 d_unknown2; /* ? */
501 __le32 d_unknown3; /* ? */
502 __le32 d_pad[8]; /* pad */
503
504 struct unixware_vtoc {
505 __le32 v_magic; /* the magic number */
506 __le32 v_version; /* version number */
507 char v_name[8]; /* volume name */
508 __le16 v_nslices; /* # of slices */
509 __le16 v_unknown1; /* ? */
510 __le32 v_reserved[10]; /* reserved */
511 struct unixware_slice
512 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
513 } vtoc;
514
515}; /* 408 */
516
517#endif /* CONFIG_UNIXWARE_DISKLABEL */
518
519#ifdef CONFIG_MINIX_SUBPARTITION
520# define MINIX_NR_SUBPARTITIONS 4
521#endif /* CONFIG_MINIX_SUBPARTITION */
522
523#define ADDPART_FLAG_NONE 0
524#define ADDPART_FLAG_RAID 1
525#define ADDPART_FLAG_WHOLEDISK 2
526
527extern dev_t blk_lookup_devt(const char *name);
528extern char *disk_name (struct gendisk *hd, int part, char *buf);
529
530extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
531extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
532extern void delete_partition(struct gendisk *, int);
533extern void printk_all_partitions(void);
534
535extern struct gendisk *alloc_disk_node(int minors, int node_id);
536extern struct gendisk *alloc_disk(int minors);
537extern struct kobject *get_disk(struct gendisk *disk);
538extern void put_disk(struct gendisk *disk);
539extern void blk_register_region(dev_t devt, unsigned long range,
540 struct module *module,
541 struct kobject *(*probe)(dev_t, int *, void *),
542 int (*lock)(dev_t, void *),
543 void *data);
544extern void blk_unregister_region(dev_t devt, unsigned long range);
545
546static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
547{
548 return bdget(MKDEV(disk->major, disk->first_minor) + index);
549}
550
551#else /* CONFIG_BLOCK */
552
553static inline void printk_all_partitions(void) { }
554
555static inline dev_t blk_lookup_devt(const char *name)
556{
557 dev_t devt = MKDEV(0, 0);
558 return devt;
559}
560
561#endif /* CONFIG_BLOCK */
562
563#endif /* _LINUX_GENHD_H */