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block: implement and use {disk|part}_to_dev()
[deliverable/linux.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
TH		 18#define kobj_to_dev(k) container_of((k), struct device, kobj)
19#define dev_to_disk(device) container_of((device), struct gendisk, __dev)
20#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
21#define disk_to_dev(disk) (&((disk)->__dev))
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
TH		 129
130 /* Array of pointers to partitions indexed by partno - 1.
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;
136
1da177e4
LT		 137 struct block_device_operations *fops;
138 struct request_queue *queue;
139 void *private_data;
140 sector_t capacity;
141
142 int flags;
edfaa7c3 143 struct device *driverfs_dev; // FIXME: remove
ed9e1982 144 struct device __dev;
6a4d44c1
JN		 145 struct kobject *holder_dir;
146 struct kobject *slave_dir;
1da177e4
LT		 147
148 struct timer_rand_state *random;
149 int policy;
150
151 atomic_t sync_io; /* RAID */
20e5c81f 152 unsigned long stamp;
1da177e4
LT		 153 int in_flight;
154#ifdef CONFIG_SMP
155 struct disk_stats *dkstats;
156#else
157 struct disk_stats dkstats;
158#endif
8ce7ad7b 159 struct work_struct async_notify;
7ba1ba12
MP		 160#ifdef CONFIG_BLK_DEV_INTEGRITY
161 struct blk_integrity *integrity;
162#endif
1da177e4
LT		 163};
164
310a2c10
TH		 165static inline struct gendisk *part_to_disk(struct hd_struct *part)
166{
167 if (likely(part))
ed9e1982 168 return dev_to_disk(part_to_dev(part)->parent);
310a2c10
TH		 169 return NULL;
170}
171
f331c029
TH		 172static inline int disk_max_parts(struct gendisk *disk)
173{
bcce3de1 174 return disk->minors + disk->ext_minors - 1;
f331c029
TH		 175}
176
177static inline dev_t disk_devt(struct gendisk *disk)
178{
ed9e1982 179 return disk_to_dev(disk)->devt;
f331c029
TH		 180}
181
182static inline dev_t part_devt(struct hd_struct *part)
183{
ed9e1982 184 return part_to_dev(part)->devt;
f331c029
TH		 185}
186
e71bf0d0
TH		 187extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
188
189static inline void disk_put_part(struct hd_struct *part)
190{
191 if (likely(part))
ed9e1982 192 put_device(part_to_dev(part));
e71bf0d0
TH		 193}
194
195/*
196 * Smarter partition iterator without context limits.
197 */
198#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
199#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
200
201struct disk_part_iter {
202 struct gendisk *disk;
203 struct hd_struct *part;
204 int idx;
205 unsigned int flags;
206};
207
208extern void disk_part_iter_init(struct disk_part_iter *piter,
209 struct gendisk *disk, unsigned int flags);
210extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
211extern void disk_part_iter_exit(struct disk_part_iter *piter);
212
213extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
214 sector_t sector);
215
c9959059 216/*
1da177e4
LT		 217 * Macros to operate on percpu disk statistics:
218 *
c9959059
TH		 219 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
220 * and should be called between disk_stat_lock() and
221 * disk_stat_unlock().
222 *
223 * part_stat_read() can be called at any time.
224 *
225 * part_stat_{add|set_all}() and {init|free}_part_stats are for
226 * internal use only.
1da177e4
LT		 227 */
228#ifdef CONFIG_SMP
c9959059
TH		 229#define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); })
230#define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
231
232#define disk_stat_add(cpu, gendiskp, field, addnd) \
233 (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd)
1da177e4
LT		 234
235#define disk_stat_read(gendiskp, field) \
236({ \
237 typeof(gendiskp->dkstats->field) res = 0; \
238 int i; \
0a945022 239 for_each_possible_cpu(i) \
1da177e4 240 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4
LT		 241 res; \
242})
243
c9959059
TH		 244static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
245{
1da177e4 246 int i;
28f13702 247
0a945022 248 for_each_possible_cpu(i)
394e3902 249 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
28f13702 250 sizeof(struct disk_stats));
1da177e4 251}
ea5c48ab 252
c9959059
TH		 253#define part_stat_add(cpu, part, field, addnd) \
254 (per_cpu_ptr(part->dkstats, cpu)->field += addnd)
ea5c48ab 255
c9959059
TH		 256#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
257({ \
258 if (part) \
259 part_stat_add(cpu, part, field, addnd); \
260 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 261})
262
263#define part_stat_read(part, field) \
264({ \
265 typeof(part->dkstats->field) res = 0; \
266 int i; \
267 for_each_possible_cpu(i) \
268 res += per_cpu_ptr(part->dkstats, i)->field; \
269 res; \
270})
271
28f13702
JA		 272static inline void part_stat_set_all(struct hd_struct *part, int value)
273{
ea5c48ab 274 int i;
28f13702 275
ea5c48ab
JM		 276 for_each_possible_cpu(i)
277 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 278 sizeof(struct disk_stats));
ea5c48ab 279}
c9959059 280
a8ae50ba 281#else /* !CONFIG_SMP */
c9959059
TH		 282#define disk_stat_lock() ({ rcu_read_lock(); 0; })
283#define disk_stat_unlock() rcu_read_unlock()
284
285#define disk_stat_add(cpu, gendiskp, field, addnd) \
286 (gendiskp->dkstats.field += addnd)
1da177e4
LT		 287#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
288
ea5c48ab
JM		 289static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
290{
1da177e4
LT		 291 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
292}
ea5c48ab 293
c9959059 294#define part_stat_add(cpu, part, field, addnd) \
ea5c48ab
JM		 295 (part->dkstats.field += addnd)
296
c9959059
TH		 297#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
298({ \
299 if (part) \
300 part_stat_add(cpu, part, field, addnd); \
301 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 302})
303
304#define part_stat_read(part, field) (part->dkstats.field)
305
306static inline void part_stat_set_all(struct hd_struct *part, int value)
307{
308 memset(&part->dkstats, value, sizeof(struct disk_stats));
309}
310
a8ae50ba 311#endif /* CONFIG_SMP */
1da177e4 312
c9959059
TH		 313#define disk_stat_dec(cpu, gendiskp, field) \
314 disk_stat_add(cpu, gendiskp, field, -1)
315#define disk_stat_inc(cpu, gendiskp, field) \
316 disk_stat_add(cpu, gendiskp, field, 1)
317#define disk_stat_sub(cpu, gendiskp, field, subnd) \
318 disk_stat_add(cpu, gendiskp, field, -subnd)
319
320#define part_stat_dec(cpu, gendiskp, field) \
321 part_stat_add(cpu, gendiskp, field, -1)
322#define part_stat_inc(cpu, gendiskp, field) \
323 part_stat_add(cpu, gendiskp, field, 1)
324#define part_stat_sub(cpu, gendiskp, field, subnd) \
325 part_stat_add(cpu, gendiskp, field, -subnd)
326
327#define all_stat_dec(cpu, gendiskp, field, sector) \
328 all_stat_add(cpu, gendiskp, field, -1, sector)
329#define all_stat_inc(cpu, gendiskp, part, field, sector) \
330 all_stat_add(cpu, gendiskp, part, field, 1, sector)
331#define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \
332 all_stat_add(cpu, gendiskp, part, field, -subnd, sector)
1da177e4
LT		 333
334/* Inlines to alloc and free disk stats in struct gendisk */
335#ifdef CONFIG_SMP
336static inline int init_disk_stats(struct gendisk *disk)
337{
338 disk->dkstats = alloc_percpu(struct disk_stats);
339 if (!disk->dkstats)
340 return 0;
341 return 1;
342}
343
344static inline void free_disk_stats(struct gendisk *disk)
345{
346 free_percpu(disk->dkstats);
347}
ea5c48ab
JM		 348
349static inline int init_part_stats(struct hd_struct *part)
350{
351 part->dkstats = alloc_percpu(struct disk_stats);
352 if (!part->dkstats)
353 return 0;
354 return 1;
355}
356
357static inline void free_part_stats(struct hd_struct *part)
358{
359 free_percpu(part->dkstats);
360}
361
1da177e4
LT		 362#else /* CONFIG_SMP */
363static inline int init_disk_stats(struct gendisk *disk)
364{
365 return 1;
366}
367
368static inline void free_disk_stats(struct gendisk *disk)
369{
370}
ea5c48ab
JM		 371
372static inline int init_part_stats(struct hd_struct *part)
373{
374 return 1;
375}
376
377static inline void free_part_stats(struct hd_struct *part)
378{
379}
1da177e4
LT		 380#endif /* CONFIG_SMP */
381
382/* drivers/block/ll_rw_blk.c */
c9959059
TH		 383extern void disk_round_stats(int cpu, struct gendisk *disk);
384extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4
LT		 385
386/* drivers/block/genhd.c */
ac20427e 387extern int get_blkdev_list(char *, int);
1da177e4
LT		 388extern void add_disk(struct gendisk *disk);
389extern void del_gendisk(struct gendisk *gp);
390extern void unlink_gendisk(struct gendisk *gp);
cf771cb5 391extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 392extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 393
394extern void set_device_ro(struct block_device *bdev, int flag);
395extern void set_disk_ro(struct gendisk *disk, int flag);
396
397/* drivers/char/random.c */
398extern void add_disk_randomness(struct gendisk *disk);
399extern void rand_initialize_disk(struct gendisk *disk);
400
401static inline sector_t get_start_sect(struct block_device *bdev)
402{
403 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
404}
405static inline sector_t get_capacity(struct gendisk *disk)
406{
407 return disk->capacity;
408}
409static inline void set_capacity(struct gendisk *disk, sector_t size)
410{
411 disk->capacity = size;
412}
413
1da177e4
LT		 414#ifdef CONFIG_SOLARIS_X86_PARTITION
415
b84d8796 416#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 417#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
418
419struct solaris_x86_slice {
420 __le16 s_tag; /* ID tag of partition */
421 __le16 s_flag; /* permission flags */
422 __le32 s_start; /* start sector no of partition */
423 __le32 s_size; /* # of blocks in partition */
424};
425
426struct solaris_x86_vtoc {
427 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
428 __le32 v_sanity; /* to verify vtoc sanity */
429 __le32 v_version; /* layout version */
430 char v_volume[8]; /* volume name */
431 __le16 v_sectorsz; /* sector size in bytes */
432 __le16 v_nparts; /* number of partitions */
433 unsigned int v_reserved[10]; /* free space */
434 struct solaris_x86_slice
435 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
436 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
437 char v_asciilabel[128]; /* for compatibility */
438};
439
440#endif /* CONFIG_SOLARIS_X86_PARTITION */
441
442#ifdef CONFIG_BSD_DISKLABEL
443/*
444 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
445 * updated by Marc Espie <Marc.Espie@openbsd.org>
446 */
447
448/* check against BSD src/sys/sys/disklabel.h for consistency */
449
450#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
451#define BSD_MAXPARTITIONS 16
452#define OPENBSD_MAXPARTITIONS 16
453#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
454struct bsd_disklabel {
455 __le32 d_magic; /* the magic number */
456 __s16 d_type; /* drive type */
457 __s16 d_subtype; /* controller/d_type specific */
458 char d_typename[16]; /* type name, e.g. "eagle" */
459 char d_packname[16]; /* pack identifier */
460 __u32 d_secsize; /* # of bytes per sector */
461 __u32 d_nsectors; /* # of data sectors per track */
462 __u32 d_ntracks; /* # of tracks per cylinder */
463 __u32 d_ncylinders; /* # of data cylinders per unit */
464 __u32 d_secpercyl; /* # of data sectors per cylinder */
465 __u32 d_secperunit; /* # of data sectors per unit */
466 __u16 d_sparespertrack; /* # of spare sectors per track */
467 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
468 __u32 d_acylinders; /* # of alt. cylinders per unit */
469 __u16 d_rpm; /* rotational speed */
470 __u16 d_interleave; /* hardware sector interleave */
471 __u16 d_trackskew; /* sector 0 skew, per track */
472 __u16 d_cylskew; /* sector 0 skew, per cylinder */
473 __u32 d_headswitch; /* head switch time, usec */
474 __u32 d_trkseek; /* track-to-track seek, usec */
475 __u32 d_flags; /* generic flags */
476#define NDDATA 5
477 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
478#define NSPARE 5
479 __u32 d_spare[NSPARE]; /* reserved for future use */
480 __le32 d_magic2; /* the magic number (again) */
481 __le16 d_checksum; /* xor of data incl. partitions */
482
483 /* filesystem and partition information: */
484 __le16 d_npartitions; /* number of partitions in following */
485 __le32 d_bbsize; /* size of boot area at sn0, bytes */
486 __le32 d_sbsize; /* max size of fs superblock, bytes */
487 struct bsd_partition { /* the partition table */
488 __le32 p_size; /* number of sectors in partition */
489 __le32 p_offset; /* starting sector */
490 __le32 p_fsize; /* filesystem basic fragment size */
491 __u8 p_fstype; /* filesystem type, see below */
492 __u8 p_frag; /* filesystem fragments per block */
493 __le16 p_cpg; /* filesystem cylinders per group */
494 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
495};
496
497#endif /* CONFIG_BSD_DISKLABEL */
498
499#ifdef CONFIG_UNIXWARE_DISKLABEL
500/*
501 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
502 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
503 */
504
505#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
506#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
507#define UNIXWARE_NUMSLICE 16
508#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
509
510struct unixware_slice {
511 __le16 s_label; /* label */
512 __le16 s_flags; /* permission flags */
513 __le32 start_sect; /* starting sector */
514 __le32 nr_sects; /* number of sectors in slice */
515};
516
517struct unixware_disklabel {
518 __le32 d_type; /* drive type */
519 __le32 d_magic; /* the magic number */
520 __le32 d_version; /* version number */
521 char d_serial[12]; /* serial number of the device */
522 __le32 d_ncylinders; /* # of data cylinders per device */
523 __le32 d_ntracks; /* # of tracks per cylinder */
524 __le32 d_nsectors; /* # of data sectors per track */
525 __le32 d_secsize; /* # of bytes per sector */
526 __le32 d_part_start; /* # of first sector of this partition */
527 __le32 d_unknown1[12]; /* ? */
528 __le32 d_alt_tbl; /* byte offset of alternate table */
529 __le32 d_alt_len; /* byte length of alternate table */
530 __le32 d_phys_cyl; /* # of physical cylinders per device */
531 __le32 d_phys_trk; /* # of physical tracks per cylinder */
532 __le32 d_phys_sec; /* # of physical sectors per track */
533 __le32 d_phys_bytes; /* # of physical bytes per sector */
534 __le32 d_unknown2; /* ? */
535 __le32 d_unknown3; /* ? */
536 __le32 d_pad[8]; /* pad */
537
538 struct unixware_vtoc {
539 __le32 v_magic; /* the magic number */
540 __le32 v_version; /* version number */
541 char v_name[8]; /* volume name */
542 __le16 v_nslices; /* # of slices */
543 __le16 v_unknown1; /* ? */
544 __le32 v_reserved[10]; /* reserved */
545 struct unixware_slice
546 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
547 } vtoc;
548
549}; /* 408 */
550
551#endif /* CONFIG_UNIXWARE_DISKLABEL */
552
553#ifdef CONFIG_MINIX_SUBPARTITION
554# define MINIX_NR_SUBPARTITIONS 4
555#endif /* CONFIG_MINIX_SUBPARTITION */
556
d18d7682
FMDN		 557#define ADDPART_FLAG_NONE 0
558#define ADDPART_FLAG_RAID 1
559#define ADDPART_FLAG_WHOLEDISK 2
560
bcce3de1
TH		 561extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
562extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 563extern dev_t blk_lookup_devt(const char *name, int partno);
564extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4
LT		 565
566extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
d805dda4 567extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4 568extern void delete_partition(struct gendisk *, int);
dd2a345f 569extern void printk_all_partitions(void);
1da177e4 570
1946089a 571extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 572extern struct gendisk *alloc_disk(int minors);
bcce3de1
TH		 573extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
574 int node_id);
575extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
1da177e4
LT		 576extern struct kobject *get_disk(struct gendisk *disk);
577extern void put_disk(struct gendisk *disk);
edfaa7c3 578extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 579 struct module *module,
580 struct kobject *(*probe)(dev_t, int *, void *),
581 int (*lock)(dev_t, void *),
582 void *data);
edfaa7c3 583extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 584
87c1efbf
JA		 585#else /* CONFIG_BLOCK */
586
587static inline void printk_all_partitions(void) { }
588
cf771cb5 589static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS		 590{
591 dev_t devt = MKDEV(0, 0);
592 return devt;
593}
594
87c1efbf 595#endif /* CONFIG_BLOCK */
9361401e 596
a8ae50ba 597#endif /* _LINUX_GENHD_H */
Linux kernel - Deliverables
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