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