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