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