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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#ifndef __KERNEL__
59
60struct partition {
61 unsigned char boot_ind; /* 0x80 - active */
62 unsigned char head; /* starting head */
63 unsigned char sector; /* starting sector */
64 unsigned char cyl; /* starting cylinder */
65 unsigned char sys_ind; /* What partition type */
66 unsigned char end_head; /* end head */
67 unsigned char end_sector; /* end sector */
68 unsigned char end_cyl; /* end cylinder */
69 unsigned int start_sect; /* starting sector counting from 0 */
70 unsigned int nr_sects; /* nr of sectors in partition */
71} __attribute__((packed));
72
73#endif
74
75#ifdef __KERNEL__
76#include <linux/major.h>
77#include <linux/device.h>
78#include <linux/smp.h>
79#include <linux/string.h>
80#include <linux/fs.h>
81#include <linux/workqueue.h>
82
83struct partition {
84 unsigned char boot_ind; /* 0x80 - active */
85 unsigned char head; /* starting head */
86 unsigned char sector; /* starting sector */
87 unsigned char cyl; /* starting cylinder */
88 unsigned char sys_ind; /* What partition type */
89 unsigned char end_head; /* end head */
90 unsigned char end_sector; /* end sector */
91 unsigned char end_cyl; /* end cylinder */
92 __le32 start_sect; /* starting sector counting from 0 */
93 __le32 nr_sects; /* nr of sectors in partition */
94} __attribute__((packed));
95
96struct disk_stats {
97 unsigned long sectors[2]; /* READs and WRITEs */
98 unsigned long ios[2];
99 unsigned long merges[2];
100 unsigned long ticks[2];
101 unsigned long io_ticks;
102 unsigned long time_in_queue;
103};
104
105struct hd_struct {
106 sector_t start_sect;
107 sector_t nr_sects;
108 struct device dev;
109 struct kobject *holder_dir;
110 int policy, partno;
111#ifdef CONFIG_FAIL_MAKE_REQUEST
112 int make_it_fail;
113#endif
114 unsigned long stamp;
115 int in_flight;
116#ifdef CONFIG_SMP
117 struct disk_stats *dkstats;
118#else
119 struct disk_stats dkstats;
120#endif
121};
122
123#define GENHD_FL_REMOVABLE 1
124#define GENHD_FL_DRIVERFS 2
125#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
126#define GENHD_FL_CD 8
127#define GENHD_FL_UP 16
128#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
129#define GENHD_FL_FAIL 64
130
131
132struct gendisk {
133 int major; /* major number of driver */
134 int first_minor;
135 int minors; /* maximum number of minors, =1 for
136 * disks that can't be partitioned. */
137 char disk_name[32]; /* name of major driver */
138 struct hd_struct **part; /* [indexed by minor] */
139 struct block_device_operations *fops;
140 struct request_queue *queue;
141 void *private_data;
142 sector_t capacity;
143
144 int flags;
145 struct device *driverfs_dev; // FIXME: remove
146 struct device dev;
147 struct kobject *holder_dir;
148 struct kobject *slave_dir;
149
150 struct timer_rand_state *random;
151 int policy;
152
153 atomic_t sync_io; /* RAID */
154 unsigned long stamp;
155 int in_flight;
156#ifdef CONFIG_SMP
157 struct disk_stats *dkstats;
158#else
159 struct disk_stats dkstats;
160#endif
161 struct work_struct async_notify;
162};
163
164/*
165 * Macros to operate on percpu disk statistics:
166 *
167 * The __ variants should only be called in critical sections. The full
168 * variants disable/enable preemption.
169 */
170static inline struct hd_struct *get_part(struct gendisk *gendiskp,
171 sector_t sector)
172{
173 struct hd_struct *part;
174 int i;
175 for (i = 0; i < gendiskp->minors - 1; i++) {
176 part = gendiskp->part[i];
177 if (part && part->start_sect <= sector
178 && sector < part->start_sect + part->nr_sects)
179 return part;
180 }
181 return NULL;
182}
183
184#ifdef CONFIG_SMP
185#define __disk_stat_add(gendiskp, field, addnd) \
186 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
187
188#define disk_stat_read(gendiskp, field) \
189({ \
190 typeof(gendiskp->dkstats->field) res = 0; \
191 int i; \
192 for_each_possible_cpu(i) \
193 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
194 res; \
195})
196
197static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
198 int i;
199 for_each_possible_cpu(i)
200 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
201 sizeof (struct disk_stats));
202}
203
204#define __part_stat_add(part, field, addnd) \
205 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
206
207#define __all_stat_add(gendiskp, field, addnd, sector) \
208({ \
209 struct hd_struct *part = get_part(gendiskp, sector); \
210 if (part) \
211 __part_stat_add(part, field, addnd); \
212 __disk_stat_add(gendiskp, field, addnd); \
213})
214
215#define part_stat_read(part, field) \
216({ \
217 typeof(part->dkstats->field) res = 0; \
218 int i; \
219 for_each_possible_cpu(i) \
220 res += per_cpu_ptr(part->dkstats, i)->field; \
221 res; \
222})
223
224static inline void part_stat_set_all(struct hd_struct *part, int value) {
225 int i;
226 for_each_possible_cpu(i)
227 memset(per_cpu_ptr(part->dkstats, i), value,
228 sizeof(struct disk_stats));
229}
230
231#else
232#define __disk_stat_add(gendiskp, field, addnd) \
233 (gendiskp->dkstats.field += addnd)
234#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
235
236static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
237{
238 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
239}
240
241#define __part_stat_add(part, field, addnd) \
242 (part->dkstats.field += addnd)
243
244#define __all_stat_add(gendiskp, field, addnd, sector) \
245({ \
246 struct hd_struct *part = get_part(gendiskp, sector); \
247 if (part) \
248 part->dkstats.field += addnd; \
249 __disk_stat_add(gendiskp, field, addnd); \
250})
251
252#define part_stat_read(part, field) (part->dkstats.field)
253
254static inline void part_stat_set_all(struct hd_struct *part, int value)
255{
256 memset(&part->dkstats, value, sizeof(struct disk_stats));
257}
258
259#endif
260
261#define disk_stat_add(gendiskp, field, addnd) \
262 do { \
263 preempt_disable(); \
264 __disk_stat_add(gendiskp, field, addnd); \
265 preempt_enable(); \
266 } while (0)
267
268#define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
269#define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
270
271#define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
272#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
273
274#define __disk_stat_sub(gendiskp, field, subnd) \
275 __disk_stat_add(gendiskp, field, -subnd)
276#define disk_stat_sub(gendiskp, field, subnd) \
277 disk_stat_add(gendiskp, field, -subnd)
278
279#define part_stat_add(gendiskp, field, addnd) \
280 do { \
281 preempt_disable(); \
282 __part_stat_add(gendiskp, field, addnd);\
283 preempt_enable(); \
284 } while (0)
285
286#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
287#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
288
289#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
290#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
291
292#define __part_stat_sub(gendiskp, field, subnd) \
293 __part_stat_add(gendiskp, field, -subnd)
294#define part_stat_sub(gendiskp, field, subnd) \
295 part_stat_add(gendiskp, field, -subnd)
296
297#define all_stat_add(gendiskp, field, addnd, sector) \
298 do { \
299 preempt_disable(); \
300 __all_stat_add(gendiskp, field, addnd, sector); \
301 preempt_enable(); \
302 } while (0)
303
304#define __all_stat_dec(gendiskp, field, sector) \
305 __all_stat_add(gendiskp, field, -1, sector)
306#define all_stat_dec(gendiskp, field, sector) \
307 all_stat_add(gendiskp, field, -1, sector)
308
309#define __all_stat_inc(gendiskp, field, sector) \
310 __all_stat_add(gendiskp, field, 1, sector)
311#define all_stat_inc(gendiskp, field, sector) \
312 all_stat_add(gendiskp, field, 1, sector)
313
314#define __all_stat_sub(gendiskp, field, subnd, sector) \
315 __all_stat_add(gendiskp, field, -subnd, sector)
316#define all_stat_sub(gendiskp, field, subnd, sector) \
317 all_stat_add(gendiskp, field, -subnd, sector)
318
319/* Inlines to alloc and free disk stats in struct gendisk */
320#ifdef CONFIG_SMP
321static inline int init_disk_stats(struct gendisk *disk)
322{
323 disk->dkstats = alloc_percpu(struct disk_stats);
324 if (!disk->dkstats)
325 return 0;
326 return 1;
327}
328
329static inline void free_disk_stats(struct gendisk *disk)
330{
331 free_percpu(disk->dkstats);
332}
333
334static inline int init_part_stats(struct hd_struct *part)
335{
336 part->dkstats = alloc_percpu(struct disk_stats);
337 if (!part->dkstats)
338 return 0;
339 return 1;
340}
341
342static inline void free_part_stats(struct hd_struct *part)
343{
344 free_percpu(part->dkstats);
345}
346
347#else /* CONFIG_SMP */
348static inline int init_disk_stats(struct gendisk *disk)
349{
350 return 1;
351}
352
353static inline void free_disk_stats(struct gendisk *disk)
354{
355}
356
357static inline int init_part_stats(struct hd_struct *part)
358{
359 return 1;
360}
361
362static inline void free_part_stats(struct hd_struct *part)
363{
364}
365#endif /* CONFIG_SMP */
366
367/* drivers/block/ll_rw_blk.c */
368extern void disk_round_stats(struct gendisk *disk);
369extern void part_round_stats(struct hd_struct *part);
370
371/* drivers/block/genhd.c */
372extern int get_blkdev_list(char *, int);
373extern void add_disk(struct gendisk *disk);
374extern void del_gendisk(struct gendisk *gp);
375extern void unlink_gendisk(struct gendisk *gp);
376extern struct gendisk *get_gendisk(dev_t dev, int *part);
377
378extern void set_device_ro(struct block_device *bdev, int flag);
379extern void set_disk_ro(struct gendisk *disk, int flag);
380
381/* drivers/char/random.c */
382extern void add_disk_randomness(struct gendisk *disk);
383extern void rand_initialize_disk(struct gendisk *disk);
384
385static inline sector_t get_start_sect(struct block_device *bdev)
386{
387 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
388}
389static inline sector_t get_capacity(struct gendisk *disk)
390{
391 return disk->capacity;
392}
393static inline void set_capacity(struct gendisk *disk, sector_t size)
394{
395 disk->capacity = size;
396}
397
398#endif /* __KERNEL__ */
399
400#ifdef CONFIG_SOLARIS_X86_PARTITION
401
402#define SOLARIS_X86_NUMSLICE 16
403#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
404
405struct solaris_x86_slice {
406 __le16 s_tag; /* ID tag of partition */
407 __le16 s_flag; /* permission flags */
408 __le32 s_start; /* start sector no of partition */
409 __le32 s_size; /* # of blocks in partition */
410};
411
412struct solaris_x86_vtoc {
413 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
414 __le32 v_sanity; /* to verify vtoc sanity */
415 __le32 v_version; /* layout version */
416 char v_volume[8]; /* volume name */
417 __le16 v_sectorsz; /* sector size in bytes */
418 __le16 v_nparts; /* number of partitions */
419 unsigned int v_reserved[10]; /* free space */
420 struct solaris_x86_slice
421 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
422 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
423 char v_asciilabel[128]; /* for compatibility */
424};
425
426#endif /* CONFIG_SOLARIS_X86_PARTITION */
427
428#ifdef CONFIG_BSD_DISKLABEL
429/*
430 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
431 * updated by Marc Espie <Marc.Espie@openbsd.org>
432 */
433
434/* check against BSD src/sys/sys/disklabel.h for consistency */
435
436#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
437#define BSD_MAXPARTITIONS 16
438#define OPENBSD_MAXPARTITIONS 16
439#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
440struct bsd_disklabel {
441 __le32 d_magic; /* the magic number */
442 __s16 d_type; /* drive type */
443 __s16 d_subtype; /* controller/d_type specific */
444 char d_typename[16]; /* type name, e.g. "eagle" */
445 char d_packname[16]; /* pack identifier */
446 __u32 d_secsize; /* # of bytes per sector */
447 __u32 d_nsectors; /* # of data sectors per track */
448 __u32 d_ntracks; /* # of tracks per cylinder */
449 __u32 d_ncylinders; /* # of data cylinders per unit */
450 __u32 d_secpercyl; /* # of data sectors per cylinder */
451 __u32 d_secperunit; /* # of data sectors per unit */
452 __u16 d_sparespertrack; /* # of spare sectors per track */
453 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
454 __u32 d_acylinders; /* # of alt. cylinders per unit */
455 __u16 d_rpm; /* rotational speed */
456 __u16 d_interleave; /* hardware sector interleave */
457 __u16 d_trackskew; /* sector 0 skew, per track */
458 __u16 d_cylskew; /* sector 0 skew, per cylinder */
459 __u32 d_headswitch; /* head switch time, usec */
460 __u32 d_trkseek; /* track-to-track seek, usec */
461 __u32 d_flags; /* generic flags */
462#define NDDATA 5
463 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
464#define NSPARE 5
465 __u32 d_spare[NSPARE]; /* reserved for future use */
466 __le32 d_magic2; /* the magic number (again) */
467 __le16 d_checksum; /* xor of data incl. partitions */
468
469 /* filesystem and partition information: */
470 __le16 d_npartitions; /* number of partitions in following */
471 __le32 d_bbsize; /* size of boot area at sn0, bytes */
472 __le32 d_sbsize; /* max size of fs superblock, bytes */
473 struct bsd_partition { /* the partition table */
474 __le32 p_size; /* number of sectors in partition */
475 __le32 p_offset; /* starting sector */
476 __le32 p_fsize; /* filesystem basic fragment size */
477 __u8 p_fstype; /* filesystem type, see below */
478 __u8 p_frag; /* filesystem fragments per block */
479 __le16 p_cpg; /* filesystem cylinders per group */
480 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
481};
482
483#endif /* CONFIG_BSD_DISKLABEL */
484
485#ifdef CONFIG_UNIXWARE_DISKLABEL
486/*
487 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
488 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
489 */
490
491#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
492#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
493#define UNIXWARE_NUMSLICE 16
494#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
495
496struct unixware_slice {
497 __le16 s_label; /* label */
498 __le16 s_flags; /* permission flags */
499 __le32 start_sect; /* starting sector */
500 __le32 nr_sects; /* number of sectors in slice */
501};
502
503struct unixware_disklabel {
504 __le32 d_type; /* drive type */
505 __le32 d_magic; /* the magic number */
506 __le32 d_version; /* version number */
507 char d_serial[12]; /* serial number of the device */
508 __le32 d_ncylinders; /* # of data cylinders per device */
509 __le32 d_ntracks; /* # of tracks per cylinder */
510 __le32 d_nsectors; /* # of data sectors per track */
511 __le32 d_secsize; /* # of bytes per sector */
512 __le32 d_part_start; /* # of first sector of this partition */
513 __le32 d_unknown1[12]; /* ? */
514 __le32 d_alt_tbl; /* byte offset of alternate table */
515 __le32 d_alt_len; /* byte length of alternate table */
516 __le32 d_phys_cyl; /* # of physical cylinders per device */
517 __le32 d_phys_trk; /* # of physical tracks per cylinder */
518 __le32 d_phys_sec; /* # of physical sectors per track */
519 __le32 d_phys_bytes; /* # of physical bytes per sector */
520 __le32 d_unknown2; /* ? */
521 __le32 d_unknown3; /* ? */
522 __le32 d_pad[8]; /* pad */
523
524 struct unixware_vtoc {
525 __le32 v_magic; /* the magic number */
526 __le32 v_version; /* version number */
527 char v_name[8]; /* volume name */
528 __le16 v_nslices; /* # of slices */
529 __le16 v_unknown1; /* ? */
530 __le32 v_reserved[10]; /* reserved */
531 struct unixware_slice
532 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
533 } vtoc;
534
535}; /* 408 */
536
537#endif /* CONFIG_UNIXWARE_DISKLABEL */
538
539#ifdef CONFIG_MINIX_SUBPARTITION
540# define MINIX_NR_SUBPARTITIONS 4
541#endif /* CONFIG_MINIX_SUBPARTITION */
542
543#ifdef __KERNEL__
544
545#define ADDPART_FLAG_NONE 0
546#define ADDPART_FLAG_RAID 1
547#define ADDPART_FLAG_WHOLEDISK 2
548
549extern dev_t blk_lookup_devt(const char *name);
550extern char *disk_name (struct gendisk *hd, int part, char *buf);
551
552extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
553extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
554extern void delete_partition(struct gendisk *, int);
555extern void printk_all_partitions(void);
556
557extern struct gendisk *alloc_disk_node(int minors, int node_id);
558extern struct gendisk *alloc_disk(int minors);
559extern struct kobject *get_disk(struct gendisk *disk);
560extern void put_disk(struct gendisk *disk);
561extern void blk_register_region(dev_t devt, unsigned long range,
562 struct module *module,
563 struct kobject *(*probe)(dev_t, int *, void *),
564 int (*lock)(dev_t, void *),
565 void *data);
566extern void blk_unregister_region(dev_t devt, unsigned long range);
567
568static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
569{
570 return bdget(MKDEV(disk->major, disk->first_minor) + index);
571}
572
573#endif
574
575#else /* CONFIG_BLOCK */
576
577static inline void printk_all_partitions(void) { }
578
579static inline dev_t blk_lookup_devt(const char *name)
580{
581 dev_t devt = MKDEV(0, 0);
582 return devt;
583}
584
585#endif /* CONFIG_BLOCK */
586
587#endif