]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - include/linux/genhd.h
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
block: always set bdev->bd_part
[mirror_ubuntu-bionic-kernel.git] / include / linux / genhd.h
CommitLineData
1da177e4
LT		 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
1da177e4 12#include <linux/types.h>
edfaa7c3 13#include <linux/kdev_t.h>
e71bf0d0 14#include <linux/rcupdate.h>
1da177e4 15
9361401e
DH		 16#ifdef CONFIG_BLOCK
17
ed9e1982 18#define kobj_to_dev(k) container_of((k), struct device, kobj)
548b10eb 19#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
ed9e1982 20#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
548b10eb 21#define disk_to_dev(disk) (&(disk)->part0.__dev)
ed9e1982 22#define part_to_dev(part) (&((part)->__dev))
edfaa7c3 23
edfaa7c3
KS		 24extern struct device_type part_type;
25extern struct kobject *block_depr;
26extern struct class block_class;
27
a0db701a
AB		 28extern const struct seq_operations partitions_op;
29extern const struct seq_operations diskstats_op;
30
1da177e4
LT		 31enum {
32/* These three have identical behaviour; use the second one if DOS FDISK gets
33 confused about extended/logical partitions starting past cylinder 1023. */
34 DOS_EXTENDED_PARTITION = 5,
35 LINUX_EXTENDED_PARTITION = 0x85,
36 WIN98_EXTENDED_PARTITION = 0x0f,
37
d18d7682
FMDN		 38 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
39
1da177e4 40 LINUX_SWAP_PARTITION = 0x82,
4419d1ac
OH		 41 LINUX_DATA_PARTITION = 0x83,
42 LINUX_LVM_PARTITION = 0x8e,
1da177e4
LT		 43 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
44
45 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
46 NEW_SOLARIS_X86_PARTITION = 0xbf,
47
48 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
49 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
50 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
51 EZD_PARTITION = 0x55, /* EZ-DRIVE */
52
53 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
54 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
55 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
56 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
57 MINIX_PARTITION = 0x81, /* Minix Partition ID */
58 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
59};
60
34186efc
DW		 61#include <linux/major.h>
62#include <linux/device.h>
63#include <linux/smp.h>
64#include <linux/string.h>
65#include <linux/fs.h>
8ce7ad7b 66#include <linux/workqueue.h>
34186efc 67
1da177e4
LT		 68struct partition {
69 unsigned char boot_ind; /* 0x80 - active */
70 unsigned char head; /* starting head */
71 unsigned char sector; /* starting sector */
72 unsigned char cyl; /* starting cylinder */
73 unsigned char sys_ind; /* What partition type */
74 unsigned char end_head; /* end head */
75 unsigned char end_sector; /* end sector */
76 unsigned char end_cyl; /* end cylinder */
77 __le32 start_sect; /* starting sector counting from 0 */
78 __le32 nr_sects; /* nr of sectors in partition */
79} __attribute__((packed));
80
ea5c48ab
JM		 81struct disk_stats {
82 unsigned long sectors[2]; /* READs and WRITEs */
83 unsigned long ios[2];
84 unsigned long merges[2];
85 unsigned long ticks[2];
86 unsigned long io_ticks;
87 unsigned long time_in_queue;
88};
89
1da177e4
LT		 90struct hd_struct {
91 sector_t start_sect;
92 sector_t nr_sects;
ed9e1982 93 struct device __dev;
6a4d44c1 94 struct kobject *holder_dir;
1da177e4 95 int policy, partno;
c17bb495
AM		 96#ifdef CONFIG_FAIL_MAKE_REQUEST
97 int make_it_fail;
ea5c48ab
JM		 98#endif
99 unsigned long stamp;
100 int in_flight;
101#ifdef CONFIG_SMP
102 struct disk_stats *dkstats;
103#else
104 struct disk_stats dkstats;
c17bb495 105#endif
e71bf0d0 106 struct rcu_head rcu_head;
1da177e4
LT		 107};
108
109#define GENHD_FL_REMOVABLE 1
110#define GENHD_FL_DRIVERFS 2
86ce18d7 111#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4
LT		 112#define GENHD_FL_CD 8
113#define GENHD_FL_UP 16
114#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
c17bb495 115#define GENHD_FL_FAIL 64
1da177e4 116
1da177e4 117struct gendisk {
bcce3de1
TH		 118 /* major, first_minor, minors and ext_minors are input
119 * parameters only, don't use directly. Use disk_devt() and
120 * disk_max_parts().
f331c029 121 */
1da177e4
LT		 122 int major; /* major number of driver */
123 int first_minor;
124 int minors; /* maximum number of minors, =1 for
125 * disks that can't be partitioned. */
bcce3de1 126 int ext_minors; /* number of extended dynamic minors */
f331c029 127
1da177e4 128 char disk_name[32]; /* name of major driver */
e71bf0d0 129
b5d0b9df 130 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH		 131 * Protected with matching bdev lock but stat and other
132 * non-critical accesses use RCU. Always access through
133 * helpers.
134 */
135 struct hd_struct **__part;
b5d0b9df 136 struct hd_struct part0;
e71bf0d0 137
1da177e4
LT		 138 struct block_device_operations *fops;
139 struct request_queue *queue;
140 void *private_data;
1da177e4
LT		 141
142 int flags;
edfaa7c3 143 struct device *driverfs_dev; // FIXME: remove
6a4d44c1 144 struct kobject *slave_dir;
1da177e4
LT		 145
146 struct timer_rand_state *random;
1da177e4
LT		 147
148 atomic_t sync_io; /* RAID */
20e5c81f 149 unsigned long stamp;
1da177e4
LT		 150 int in_flight;
151#ifdef CONFIG_SMP
152 struct disk_stats *dkstats;
153#else
154 struct disk_stats dkstats;
155#endif
8ce7ad7b 156 struct work_struct async_notify;
7ba1ba12
MP		 157#ifdef CONFIG_BLK_DEV_INTEGRITY
158 struct blk_integrity *integrity;
159#endif
1da177e4
LT		 160};
161
310a2c10
TH		 162static inline struct gendisk *part_to_disk(struct hd_struct *part)
163{
548b10eb
TH		 164 if (likely(part)) {
165 if (part->partno)
166 return dev_to_disk(part_to_dev(part)->parent);
167 else
168 return dev_to_disk(part_to_dev(part));
169 }
310a2c10
TH		 170 return NULL;
171}
172
f331c029
TH		 173static inline int disk_max_parts(struct gendisk *disk)
174{
b5d0b9df
TH		 175 return disk->minors + disk->ext_minors;
176}
177
178static inline bool disk_partitionable(struct gendisk *disk)
179{
180 return disk_max_parts(disk) > 1;
f331c029
TH		 181}
182
183static inline dev_t disk_devt(struct gendisk *disk)
184{
ed9e1982 185 return disk_to_dev(disk)->devt;
f331c029
TH		 186}
187
188static inline dev_t part_devt(struct hd_struct *part)
189{
ed9e1982 190 return part_to_dev(part)->devt;
f331c029
TH		 191}
192
e71bf0d0
TH		 193extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
194
195static inline void disk_put_part(struct hd_struct *part)
196{
197 if (likely(part))
ed9e1982 198 put_device(part_to_dev(part));
e71bf0d0
TH		 199}
200
201/*
202 * Smarter partition iterator without context limits.
203 */
204#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
205#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df 206#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
e71bf0d0
TH		 207
208struct disk_part_iter {
209 struct gendisk *disk;
210 struct hd_struct *part;
211 int idx;
212 unsigned int flags;
213};
214
215extern void disk_part_iter_init(struct disk_part_iter *piter,
216 struct gendisk *disk, unsigned int flags);
217extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
218extern void disk_part_iter_exit(struct disk_part_iter *piter);
219
220extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
221 sector_t sector);
222
c9959059 223/*
1da177e4
LT		 224 * Macros to operate on percpu disk statistics:
225 *
c9959059
TH		 226 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
227 * and should be called between disk_stat_lock() and
228 * disk_stat_unlock().
229 *
230 * part_stat_read() can be called at any time.
231 *
232 * part_stat_{add|set_all}() and {init|free}_part_stats are for
233 * internal use only.
1da177e4
LT		 234 */
235#ifdef CONFIG_SMP
c9959059
TH		 236#define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); })
237#define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
238
239#define disk_stat_add(cpu, gendiskp, field, addnd) \
240 (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd)
1da177e4
LT		 241
242#define disk_stat_read(gendiskp, field) \
243({ \
244 typeof(gendiskp->dkstats->field) res = 0; \
245 int i; \
0a945022 246 for_each_possible_cpu(i) \
1da177e4 247 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4
LT		 248 res; \
249})
250
c9959059
TH		 251static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
252{
1da177e4 253 int i;
28f13702 254
0a945022 255 for_each_possible_cpu(i)
394e3902 256 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
28f13702 257 sizeof(struct disk_stats));
1da177e4 258}
ea5c48ab 259
c9959059
TH		 260#define part_stat_add(cpu, part, field, addnd) \
261 (per_cpu_ptr(part->dkstats, cpu)->field += addnd)
ea5c48ab 262
c9959059
TH		 263#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
264({ \
265 if (part) \
266 part_stat_add(cpu, part, field, addnd); \
267 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 268})
269
270#define part_stat_read(part, field) \
271({ \
272 typeof(part->dkstats->field) res = 0; \
273 int i; \
274 for_each_possible_cpu(i) \
275 res += per_cpu_ptr(part->dkstats, i)->field; \
276 res; \
277})
278
28f13702
JA		 279static inline void part_stat_set_all(struct hd_struct *part, int value)
280{
ea5c48ab 281 int i;
28f13702 282
ea5c48ab
JM		 283 for_each_possible_cpu(i)
284 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 285 sizeof(struct disk_stats));
ea5c48ab 286}
c9959059 287
a8ae50ba 288#else /* !CONFIG_SMP */
c9959059
TH		 289#define disk_stat_lock() ({ rcu_read_lock(); 0; })
290#define disk_stat_unlock() rcu_read_unlock()
291
292#define disk_stat_add(cpu, gendiskp, field, addnd) \
293 (gendiskp->dkstats.field += addnd)
1da177e4
LT		 294#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
295
ea5c48ab
JM		 296static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
297{
1da177e4
LT		 298 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
299}
ea5c48ab 300
c9959059 301#define part_stat_add(cpu, part, field, addnd) \
ea5c48ab
JM		 302 (part->dkstats.field += addnd)
303
c9959059
TH		 304#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
305({ \
306 if (part) \
307 part_stat_add(cpu, part, field, addnd); \
308 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 309})
310
311#define part_stat_read(part, field) (part->dkstats.field)
312
313static inline void part_stat_set_all(struct hd_struct *part, int value)
314{
315 memset(&part->dkstats, value, sizeof(struct disk_stats));
316}
317
a8ae50ba 318#endif /* CONFIG_SMP */
1da177e4 319
c9959059
TH		 320#define disk_stat_dec(cpu, gendiskp, field) \
321 disk_stat_add(cpu, gendiskp, field, -1)
322#define disk_stat_inc(cpu, gendiskp, field) \
323 disk_stat_add(cpu, gendiskp, field, 1)
324#define disk_stat_sub(cpu, gendiskp, field, subnd) \
325 disk_stat_add(cpu, gendiskp, field, -subnd)
326
327#define part_stat_dec(cpu, gendiskp, field) \
328 part_stat_add(cpu, gendiskp, field, -1)
329#define part_stat_inc(cpu, gendiskp, field) \
330 part_stat_add(cpu, gendiskp, field, 1)
331#define part_stat_sub(cpu, gendiskp, field, subnd) \
332 part_stat_add(cpu, gendiskp, field, -subnd)
333
334#define all_stat_dec(cpu, gendiskp, field, sector) \
335 all_stat_add(cpu, gendiskp, field, -1, sector)
336#define all_stat_inc(cpu, gendiskp, part, field, sector) \
337 all_stat_add(cpu, gendiskp, part, field, 1, sector)
338#define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \
339 all_stat_add(cpu, gendiskp, part, field, -subnd, sector)
1da177e4
LT		 340
341/* Inlines to alloc and free disk stats in struct gendisk */
342#ifdef CONFIG_SMP
343static inline int init_disk_stats(struct gendisk *disk)
344{
345 disk->dkstats = alloc_percpu(struct disk_stats);
346 if (!disk->dkstats)
347 return 0;
348 return 1;
349}
350
351static inline void free_disk_stats(struct gendisk *disk)
352{
353 free_percpu(disk->dkstats);
354}
ea5c48ab
JM		 355
356static inline int init_part_stats(struct hd_struct *part)
357{
358 part->dkstats = alloc_percpu(struct disk_stats);
359 if (!part->dkstats)
360 return 0;
361 return 1;
362}
363
364static inline void free_part_stats(struct hd_struct *part)
365{
366 free_percpu(part->dkstats);
367}
368
1da177e4
LT		 369#else /* CONFIG_SMP */
370static inline int init_disk_stats(struct gendisk *disk)
371{
372 return 1;
373}
374
375static inline void free_disk_stats(struct gendisk *disk)
376{
377}
ea5c48ab
JM		 378
379static inline int init_part_stats(struct hd_struct *part)
380{
381 return 1;
382}
383
384static inline void free_part_stats(struct hd_struct *part)
385{
386}
1da177e4
LT		 387#endif /* CONFIG_SMP */
388
389/* drivers/block/ll_rw_blk.c */
c9959059
TH		 390extern void disk_round_stats(int cpu, struct gendisk *disk);
391extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4
LT		 392
393/* drivers/block/genhd.c */
ac20427e 394extern int get_blkdev_list(char *, int);
1da177e4
LT		 395extern void add_disk(struct gendisk *disk);
396extern void del_gendisk(struct gendisk *gp);
397extern void unlink_gendisk(struct gendisk *gp);
cf771cb5 398extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 399extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 400
401extern void set_device_ro(struct block_device *bdev, int flag);
402extern void set_disk_ro(struct gendisk *disk, int flag);
403
b7db9956
TH		 404static inline int get_disk_ro(struct gendisk *disk)
405{
406 return disk->part0.policy;
407}
408
1da177e4
LT		 409/* drivers/char/random.c */
410extern void add_disk_randomness(struct gendisk *disk);
411extern void rand_initialize_disk(struct gendisk *disk);
412
413static inline sector_t get_start_sect(struct block_device *bdev)
414{
0762b8bd 415 return bdev->bd_part->start_sect;
1da177e4
LT		 416}
417static inline sector_t get_capacity(struct gendisk *disk)
418{
80795aef 419 return disk->part0.nr_sects;
1da177e4
LT		 420}
421static inline void set_capacity(struct gendisk *disk, sector_t size)
422{
80795aef 423 disk->part0.nr_sects = size;
1da177e4
LT		 424}
425
1da177e4
LT		 426#ifdef CONFIG_SOLARIS_X86_PARTITION
427
b84d8796 428#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 429#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
430
431struct solaris_x86_slice {
432 __le16 s_tag; /* ID tag of partition */
433 __le16 s_flag; /* permission flags */
434 __le32 s_start; /* start sector no of partition */
435 __le32 s_size; /* # of blocks in partition */
436};
437
438struct solaris_x86_vtoc {
439 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
440 __le32 v_sanity; /* to verify vtoc sanity */
441 __le32 v_version; /* layout version */
442 char v_volume[8]; /* volume name */
443 __le16 v_sectorsz; /* sector size in bytes */
444 __le16 v_nparts; /* number of partitions */
445 unsigned int v_reserved[10]; /* free space */
446 struct solaris_x86_slice
447 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
448 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
449 char v_asciilabel[128]; /* for compatibility */
450};
451
452#endif /* CONFIG_SOLARIS_X86_PARTITION */
453
454#ifdef CONFIG_BSD_DISKLABEL
455/*
456 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
457 * updated by Marc Espie <Marc.Espie@openbsd.org>
458 */
459
460/* check against BSD src/sys/sys/disklabel.h for consistency */
461
462#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
463#define BSD_MAXPARTITIONS 16
464#define OPENBSD_MAXPARTITIONS 16
465#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
466struct bsd_disklabel {
467 __le32 d_magic; /* the magic number */
468 __s16 d_type; /* drive type */
469 __s16 d_subtype; /* controller/d_type specific */
470 char d_typename[16]; /* type name, e.g. "eagle" */
471 char d_packname[16]; /* pack identifier */
472 __u32 d_secsize; /* # of bytes per sector */
473 __u32 d_nsectors; /* # of data sectors per track */
474 __u32 d_ntracks; /* # of tracks per cylinder */
475 __u32 d_ncylinders; /* # of data cylinders per unit */
476 __u32 d_secpercyl; /* # of data sectors per cylinder */
477 __u32 d_secperunit; /* # of data sectors per unit */
478 __u16 d_sparespertrack; /* # of spare sectors per track */
479 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
480 __u32 d_acylinders; /* # of alt. cylinders per unit */
481 __u16 d_rpm; /* rotational speed */
482 __u16 d_interleave; /* hardware sector interleave */
483 __u16 d_trackskew; /* sector 0 skew, per track */
484 __u16 d_cylskew; /* sector 0 skew, per cylinder */
485 __u32 d_headswitch; /* head switch time, usec */
486 __u32 d_trkseek; /* track-to-track seek, usec */
487 __u32 d_flags; /* generic flags */
488#define NDDATA 5
489 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
490#define NSPARE 5
491 __u32 d_spare[NSPARE]; /* reserved for future use */
492 __le32 d_magic2; /* the magic number (again) */
493 __le16 d_checksum; /* xor of data incl. partitions */
494
495 /* filesystem and partition information: */
496 __le16 d_npartitions; /* number of partitions in following */
497 __le32 d_bbsize; /* size of boot area at sn0, bytes */
498 __le32 d_sbsize; /* max size of fs superblock, bytes */
499 struct bsd_partition { /* the partition table */
500 __le32 p_size; /* number of sectors in partition */
501 __le32 p_offset; /* starting sector */
502 __le32 p_fsize; /* filesystem basic fragment size */
503 __u8 p_fstype; /* filesystem type, see below */
504 __u8 p_frag; /* filesystem fragments per block */
505 __le16 p_cpg; /* filesystem cylinders per group */
506 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
507};
508
509#endif /* CONFIG_BSD_DISKLABEL */
510
511#ifdef CONFIG_UNIXWARE_DISKLABEL
512/*
513 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
514 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
515 */
516
517#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
518#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
519#define UNIXWARE_NUMSLICE 16
520#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
521
522struct unixware_slice {
523 __le16 s_label; /* label */
524 __le16 s_flags; /* permission flags */
525 __le32 start_sect; /* starting sector */
526 __le32 nr_sects; /* number of sectors in slice */
527};
528
529struct unixware_disklabel {
530 __le32 d_type; /* drive type */
531 __le32 d_magic; /* the magic number */
532 __le32 d_version; /* version number */
533 char d_serial[12]; /* serial number of the device */
534 __le32 d_ncylinders; /* # of data cylinders per device */
535 __le32 d_ntracks; /* # of tracks per cylinder */
536 __le32 d_nsectors; /* # of data sectors per track */
537 __le32 d_secsize; /* # of bytes per sector */
538 __le32 d_part_start; /* # of first sector of this partition */
539 __le32 d_unknown1[12]; /* ? */
540 __le32 d_alt_tbl; /* byte offset of alternate table */
541 __le32 d_alt_len; /* byte length of alternate table */
542 __le32 d_phys_cyl; /* # of physical cylinders per device */
543 __le32 d_phys_trk; /* # of physical tracks per cylinder */
544 __le32 d_phys_sec; /* # of physical sectors per track */
545 __le32 d_phys_bytes; /* # of physical bytes per sector */
546 __le32 d_unknown2; /* ? */
547 __le32 d_unknown3; /* ? */
548 __le32 d_pad[8]; /* pad */
549
550 struct unixware_vtoc {
551 __le32 v_magic; /* the magic number */
552 __le32 v_version; /* version number */
553 char v_name[8]; /* volume name */
554 __le16 v_nslices; /* # of slices */
555 __le16 v_unknown1; /* ? */
556 __le32 v_reserved[10]; /* reserved */
557 struct unixware_slice
558 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
559 } vtoc;
560
561}; /* 408 */
562
563#endif /* CONFIG_UNIXWARE_DISKLABEL */
564
565#ifdef CONFIG_MINIX_SUBPARTITION
566# define MINIX_NR_SUBPARTITIONS 4
567#endif /* CONFIG_MINIX_SUBPARTITION */
568
d18d7682
FMDN		 569#define ADDPART_FLAG_NONE 0
570#define ADDPART_FLAG_RAID 1
571#define ADDPART_FLAG_WHOLEDISK 2
572
bcce3de1
TH		 573extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
574extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 575extern dev_t blk_lookup_devt(const char *name, int partno);
576extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4
LT		 577
578extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
d805dda4 579extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4 580extern void delete_partition(struct gendisk *, int);
dd2a345f 581extern void printk_all_partitions(void);
1da177e4 582
1946089a 583extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 584extern struct gendisk *alloc_disk(int minors);
bcce3de1
TH		 585extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
586 int node_id);
587extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
1da177e4
LT		 588extern struct kobject *get_disk(struct gendisk *disk);
589extern void put_disk(struct gendisk *disk);
edfaa7c3 590extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 591 struct module *module,
592 struct kobject *(*probe)(dev_t, int *, void *),
593 int (*lock)(dev_t, void *),
594 void *data);
edfaa7c3 595extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 596
e5610521
TH		 597extern ssize_t part_size_show(struct device *dev,
598 struct device_attribute *attr, char *buf);
599
87c1efbf
JA		 600#else /* CONFIG_BLOCK */
601
602static inline void printk_all_partitions(void) { }
603
cf771cb5 604static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS		 605{
606 dev_t devt = MKDEV(0, 0);
607 return devt;
608}
609
87c1efbf 610#endif /* CONFIG_BLOCK */
9361401e 611
a8ae50ba 612#endif /* _LINUX_GENHD_H */
ubuntu-bionic-kernel mirror