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[linux-2.6-block.git] / include / linux / genhd.h
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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
115
1da177e4 116struct gendisk {
bcce3de1
TH		 117 /* major, first_minor, minors and ext_minors are input
118 * parameters only, don't use directly. Use disk_devt() and
119 * disk_max_parts().
f331c029 120 */
1da177e4
LT		 121 int major; /* major number of driver */
122 int first_minor;
123 int minors; /* maximum number of minors, =1 for
124 * disks that can't be partitioned. */
bcce3de1 125 int ext_minors; /* number of extended dynamic minors */
f331c029 126
1da177e4 127 char disk_name[32]; /* name of major driver */
e71bf0d0 128
b5d0b9df 129 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH		 130 * Protected with matching bdev lock but stat and other
131 * non-critical accesses use RCU. Always access through
132 * helpers.
133 */
134 struct hd_struct **__part;
b5d0b9df 135 struct hd_struct part0;
e71bf0d0 136
1da177e4
LT		 137 struct block_device_operations *fops;
138 struct request_queue *queue;
139 void *private_data;
1da177e4
LT		 140
141 int flags;
edfaa7c3 142 struct device *driverfs_dev; // FIXME: remove
6a4d44c1 143 struct kobject *slave_dir;
1da177e4
LT		 144
145 struct timer_rand_state *random;
1da177e4
LT		 146
147 atomic_t sync_io; /* RAID */
8ce7ad7b 148 struct work_struct async_notify;
7ba1ba12
MP		 149#ifdef CONFIG_BLK_DEV_INTEGRITY
150 struct blk_integrity *integrity;
151#endif
1da177e4
LT		 152};
153
310a2c10
TH		 154static inline struct gendisk *part_to_disk(struct hd_struct *part)
155{
548b10eb
TH		 156 if (likely(part)) {
157 if (part->partno)
158 return dev_to_disk(part_to_dev(part)->parent);
159 else
160 return dev_to_disk(part_to_dev(part));
161 }
310a2c10
TH		 162 return NULL;
163}
164
f331c029
TH		 165static inline int disk_max_parts(struct gendisk *disk)
166{
b5d0b9df
TH		 167 return disk->minors + disk->ext_minors;
168}
169
170static inline bool disk_partitionable(struct gendisk *disk)
171{
172 return disk_max_parts(disk) > 1;
f331c029
TH		 173}
174
175static inline dev_t disk_devt(struct gendisk *disk)
176{
ed9e1982 177 return disk_to_dev(disk)->devt;
f331c029
TH		 178}
179
180static inline dev_t part_devt(struct hd_struct *part)
181{
ed9e1982 182 return part_to_dev(part)->devt;
f331c029
TH		 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))
ed9e1982 190 put_device(part_to_dev(part));
e71bf0d0
TH		 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 */
b5d0b9df 198#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
e71bf0d0
TH		 199
200struct disk_part_iter {
201 struct gendisk *disk;
202 struct hd_struct *part;
203 int idx;
204 unsigned int flags;
205};
206
207extern void disk_part_iter_init(struct disk_part_iter *piter,
208 struct gendisk *disk, unsigned int flags);
209extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
210extern void disk_part_iter_exit(struct disk_part_iter *piter);
211
212extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
213 sector_t sector);
214
c9959059 215/*
1da177e4
LT		 216 * Macros to operate on percpu disk statistics:
217 *
c9959059
TH		 218 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
219 * and should be called between disk_stat_lock() and
220 * disk_stat_unlock().
221 *
222 * part_stat_read() can be called at any time.
223 *
224 * part_stat_{add|set_all}() and {init|free}_part_stats are for
225 * internal use only.
1da177e4
LT		 226 */
227#ifdef CONFIG_SMP
074a7aca
TH		 228#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
229#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
ea5c48ab 230
074a7aca
TH		 231#define __part_stat_add(cpu, part, field, addnd) \
232 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
ea5c48ab
JM		 233
234#define part_stat_read(part, field) \
235({ \
074a7aca 236 typeof((part)->dkstats->field) res = 0; \
ea5c48ab
JM		 237 int i; \
238 for_each_possible_cpu(i) \
074a7aca 239 res += per_cpu_ptr((part)->dkstats, i)->field; \
ea5c48ab
JM		 240 res; \
241})
242
28f13702
JA		 243static inline void part_stat_set_all(struct hd_struct *part, int value)
244{
ea5c48ab 245 int i;
28f13702 246
ea5c48ab
JM		 247 for_each_possible_cpu(i)
248 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 249 sizeof(struct disk_stats));
ea5c48ab 250}
c9959059 251
074a7aca 252static inline int init_part_stats(struct hd_struct *part)
ea5c48ab 253{
074a7aca
TH		 254 part->dkstats = alloc_percpu(struct disk_stats);
255 if (!part->dkstats)
256 return 0;
257 return 1;
1da177e4 258}
ea5c48ab 259
074a7aca 260static inline void free_part_stats(struct hd_struct *part)
ea5c48ab 261{
074a7aca 262 free_percpu(part->dkstats);
ea5c48ab
JM		 263}
264
074a7aca
TH		 265#else /* !CONFIG_SMP */
266#define part_stat_lock() ({ rcu_read_lock(); 0; })
267#define part_stat_unlock() rcu_read_unlock()
c9959059 268
074a7aca
TH		 269#define __part_stat_add(cpu, part, field, addnd) \
270 ((part)->dkstats.field += addnd)
1da177e4 271
074a7aca 272#define part_stat_read(part, field) ((part)->dkstats.field)
1da177e4 273
074a7aca 274static inline void part_stat_set_all(struct hd_struct *part, int value)
1da177e4 275{
074a7aca 276 memset(&part->dkstats, value, sizeof(struct disk_stats));
1da177e4 277}
ea5c48ab
JM		 278
279static inline int init_part_stats(struct hd_struct *part)
280{
ea5c48ab
JM		 281 return 1;
282}
283
284static inline void free_part_stats(struct hd_struct *part)
285{
ea5c48ab
JM		 286}
287
074a7aca 288#endif /* CONFIG_SMP */
1da177e4 289
074a7aca
TH		 290#define part_stat_add(cpu, part, field, addnd) do { \
291 __part_stat_add((cpu), (part), field, addnd); \
292 if ((part)->partno) \
293 __part_stat_add((cpu), &part_to_disk((part))->part0, \
294 field, addnd); \
295} while (0)
ea5c48ab 296
074a7aca
TH		 297#define part_stat_dec(cpu, gendiskp, field) \
298 part_stat_add(cpu, gendiskp, field, -1)
299#define part_stat_inc(cpu, gendiskp, field) \
300 part_stat_add(cpu, gendiskp, field, 1)
301#define part_stat_sub(cpu, gendiskp, field, subnd) \
302 part_stat_add(cpu, gendiskp, field, -subnd)
303
304static inline void part_inc_in_flight(struct hd_struct *part)
ea5c48ab 305{
074a7aca
TH		 306 part->in_flight++;
307 if (part->partno)
308 part_to_disk(part)->part0.in_flight++;
ea5c48ab
JM		 309}
310
074a7aca 311static inline void part_dec_in_flight(struct hd_struct *part)
ea5c48ab 312{
074a7aca
TH		 313 part->in_flight--;
314 if (part->partno)
315 part_to_disk(part)->part0.in_flight--;
ea5c48ab 316}
1da177e4
LT		 317
318/* drivers/block/ll_rw_blk.c */
c9959059 319extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4
LT		 320
321/* drivers/block/genhd.c */
ac20427e 322extern int get_blkdev_list(char *, int);
1da177e4
LT		 323extern void add_disk(struct gendisk *disk);
324extern void del_gendisk(struct gendisk *gp);
325extern void unlink_gendisk(struct gendisk *gp);
cf771cb5 326extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 327extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 328
329extern void set_device_ro(struct block_device *bdev, int flag);
330extern void set_disk_ro(struct gendisk *disk, int flag);
331
b7db9956
TH		 332static inline int get_disk_ro(struct gendisk *disk)
333{
334 return disk->part0.policy;
335}
336
1da177e4
LT		 337/* drivers/char/random.c */
338extern void add_disk_randomness(struct gendisk *disk);
339extern void rand_initialize_disk(struct gendisk *disk);
340
341static inline sector_t get_start_sect(struct block_device *bdev)
342{
0762b8bd 343 return bdev->bd_part->start_sect;
1da177e4
LT		 344}
345static inline sector_t get_capacity(struct gendisk *disk)
346{
80795aef 347 return disk->part0.nr_sects;
1da177e4
LT		 348}
349static inline void set_capacity(struct gendisk *disk, sector_t size)
350{
80795aef 351 disk->part0.nr_sects = size;
1da177e4
LT		 352}
353
1da177e4
LT		 354#ifdef CONFIG_SOLARIS_X86_PARTITION
355
b84d8796 356#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 357#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
358
359struct solaris_x86_slice {
360 __le16 s_tag; /* ID tag of partition */
361 __le16 s_flag; /* permission flags */
362 __le32 s_start; /* start sector no of partition */
363 __le32 s_size; /* # of blocks in partition */
364};
365
366struct solaris_x86_vtoc {
367 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
368 __le32 v_sanity; /* to verify vtoc sanity */
369 __le32 v_version; /* layout version */
370 char v_volume[8]; /* volume name */
371 __le16 v_sectorsz; /* sector size in bytes */
372 __le16 v_nparts; /* number of partitions */
373 unsigned int v_reserved[10]; /* free space */
374 struct solaris_x86_slice
375 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
376 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
377 char v_asciilabel[128]; /* for compatibility */
378};
379
380#endif /* CONFIG_SOLARIS_X86_PARTITION */
381
382#ifdef CONFIG_BSD_DISKLABEL
383/*
384 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
385 * updated by Marc Espie <Marc.Espie@openbsd.org>
386 */
387
388/* check against BSD src/sys/sys/disklabel.h for consistency */
389
390#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
391#define BSD_MAXPARTITIONS 16
392#define OPENBSD_MAXPARTITIONS 16
393#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
394struct bsd_disklabel {
395 __le32 d_magic; /* the magic number */
396 __s16 d_type; /* drive type */
397 __s16 d_subtype; /* controller/d_type specific */
398 char d_typename[16]; /* type name, e.g. "eagle" */
399 char d_packname[16]; /* pack identifier */
400 __u32 d_secsize; /* # of bytes per sector */
401 __u32 d_nsectors; /* # of data sectors per track */
402 __u32 d_ntracks; /* # of tracks per cylinder */
403 __u32 d_ncylinders; /* # of data cylinders per unit */
404 __u32 d_secpercyl; /* # of data sectors per cylinder */
405 __u32 d_secperunit; /* # of data sectors per unit */
406 __u16 d_sparespertrack; /* # of spare sectors per track */
407 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
408 __u32 d_acylinders; /* # of alt. cylinders per unit */
409 __u16 d_rpm; /* rotational speed */
410 __u16 d_interleave; /* hardware sector interleave */
411 __u16 d_trackskew; /* sector 0 skew, per track */
412 __u16 d_cylskew; /* sector 0 skew, per cylinder */
413 __u32 d_headswitch; /* head switch time, usec */
414 __u32 d_trkseek; /* track-to-track seek, usec */
415 __u32 d_flags; /* generic flags */
416#define NDDATA 5
417 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
418#define NSPARE 5
419 __u32 d_spare[NSPARE]; /* reserved for future use */
420 __le32 d_magic2; /* the magic number (again) */
421 __le16 d_checksum; /* xor of data incl. partitions */
422
423 /* filesystem and partition information: */
424 __le16 d_npartitions; /* number of partitions in following */
425 __le32 d_bbsize; /* size of boot area at sn0, bytes */
426 __le32 d_sbsize; /* max size of fs superblock, bytes */
427 struct bsd_partition { /* the partition table */
428 __le32 p_size; /* number of sectors in partition */
429 __le32 p_offset; /* starting sector */
430 __le32 p_fsize; /* filesystem basic fragment size */
431 __u8 p_fstype; /* filesystem type, see below */
432 __u8 p_frag; /* filesystem fragments per block */
433 __le16 p_cpg; /* filesystem cylinders per group */
434 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
435};
436
437#endif /* CONFIG_BSD_DISKLABEL */
438
439#ifdef CONFIG_UNIXWARE_DISKLABEL
440/*
441 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
442 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
443 */
444
445#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
446#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
447#define UNIXWARE_NUMSLICE 16
448#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
449
450struct unixware_slice {
451 __le16 s_label; /* label */
452 __le16 s_flags; /* permission flags */
453 __le32 start_sect; /* starting sector */
454 __le32 nr_sects; /* number of sectors in slice */
455};
456
457struct unixware_disklabel {
458 __le32 d_type; /* drive type */
459 __le32 d_magic; /* the magic number */
460 __le32 d_version; /* version number */
461 char d_serial[12]; /* serial number of the device */
462 __le32 d_ncylinders; /* # of data cylinders per device */
463 __le32 d_ntracks; /* # of tracks per cylinder */
464 __le32 d_nsectors; /* # of data sectors per track */
465 __le32 d_secsize; /* # of bytes per sector */
466 __le32 d_part_start; /* # of first sector of this partition */
467 __le32 d_unknown1[12]; /* ? */
468 __le32 d_alt_tbl; /* byte offset of alternate table */
469 __le32 d_alt_len; /* byte length of alternate table */
470 __le32 d_phys_cyl; /* # of physical cylinders per device */
471 __le32 d_phys_trk; /* # of physical tracks per cylinder */
472 __le32 d_phys_sec; /* # of physical sectors per track */
473 __le32 d_phys_bytes; /* # of physical bytes per sector */
474 __le32 d_unknown2; /* ? */
475 __le32 d_unknown3; /* ? */
476 __le32 d_pad[8]; /* pad */
477
478 struct unixware_vtoc {
479 __le32 v_magic; /* the magic number */
480 __le32 v_version; /* version number */
481 char v_name[8]; /* volume name */
482 __le16 v_nslices; /* # of slices */
483 __le16 v_unknown1; /* ? */
484 __le32 v_reserved[10]; /* reserved */
485 struct unixware_slice
486 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
487 } vtoc;
488
489}; /* 408 */
490
491#endif /* CONFIG_UNIXWARE_DISKLABEL */
492
493#ifdef CONFIG_MINIX_SUBPARTITION
494# define MINIX_NR_SUBPARTITIONS 4
495#endif /* CONFIG_MINIX_SUBPARTITION */
496
d18d7682
FMDN		 497#define ADDPART_FLAG_NONE 0
498#define ADDPART_FLAG_RAID 1
499#define ADDPART_FLAG_WHOLEDISK 2
500
bcce3de1
TH		 501extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
502extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 503extern dev_t blk_lookup_devt(const char *name, int partno);
504extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4
LT		 505
506extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
d805dda4 507extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4 508extern void delete_partition(struct gendisk *, int);
dd2a345f 509extern void printk_all_partitions(void);
1da177e4 510
1946089a 511extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 512extern struct gendisk *alloc_disk(int minors);
bcce3de1
TH		 513extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
514 int node_id);
515extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
1da177e4
LT		 516extern struct kobject *get_disk(struct gendisk *disk);
517extern void put_disk(struct gendisk *disk);
edfaa7c3 518extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 519 struct module *module,
520 struct kobject *(*probe)(dev_t, int *, void *),
521 int (*lock)(dev_t, void *),
522 void *data);
edfaa7c3 523extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 524
e5610521
TH		 525extern ssize_t part_size_show(struct device *dev,
526 struct device_attribute *attr, char *buf);
074a7aca
TH		 527extern ssize_t part_stat_show(struct device *dev,
528 struct device_attribute *attr, char *buf);
eddb2e26
TH		 529#ifdef CONFIG_FAIL_MAKE_REQUEST
530extern ssize_t part_fail_show(struct device *dev,
531 struct device_attribute *attr, char *buf);
532extern ssize_t part_fail_store(struct device *dev,
533 struct device_attribute *attr,
534 const char *buf, size_t count);
535#endif /* CONFIG_FAIL_MAKE_REQUEST */
e5610521 536
87c1efbf
JA		 537#else /* CONFIG_BLOCK */
538
539static inline void printk_all_partitions(void) { }
540
cf771cb5 541static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS		 542{
543 dev_t devt = MKDEV(0, 0);
544 return devt;
545}
546
87c1efbf 547#endif /* CONFIG_BLOCK */
9361401e 548
a8ae50ba 549#endif /* _LINUX_GENHD_H */
Linux 6.x block layer and io_uring tree(s)