Line data Source code
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 :
12 : #include <linux/types.h>
13 : #include <linux/kdev_t.h>
14 : #include <linux/rcupdate.h>
15 :
16 : #ifdef CONFIG_BLOCK
17 :
18 : #define kobj_to_dev(k) container_of((k), struct device, kobj)
19 : #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
20 : #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
21 : #define disk_to_dev(disk) (&(disk)->part0.__dev)
22 : #define part_to_dev(part) (&((part)->__dev))
23 :
24 1 : extern struct device_type part_type;
25 : extern struct kobject *block_depr;
26 1 : extern struct class block_class;
27 :
28 : enum {
29 : /* These three have identical behaviour; use the second one if DOS FDISK gets
30 : confused about extended/logical partitions starting past cylinder 1023. */
31 : DOS_EXTENDED_PARTITION = 5,
32 : LINUX_EXTENDED_PARTITION = 0x85,
33 : WIN98_EXTENDED_PARTITION = 0x0f,
34 :
35 : SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
36 :
37 : LINUX_SWAP_PARTITION = 0x82,
38 : LINUX_DATA_PARTITION = 0x83,
39 : LINUX_LVM_PARTITION = 0x8e,
40 : LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
41 :
42 : SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
43 : NEW_SOLARIS_X86_PARTITION = 0xbf,
44 :
45 : DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
46 : DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
47 : DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
48 : EZD_PARTITION = 0x55, /* EZ-DRIVE */
49 :
50 1 : FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
51 : OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
52 : NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
53 : BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
54 : MINIX_PARTITION = 0x81, /* Minix Partition ID */
55 : UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
56 : };
57 :
58 : #define DISK_MAX_PARTS 256
59 : #define DISK_NAME_LEN 32
60 :
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>
66 : #include <linux/workqueue.h>
67 :
68 : struct 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 1 :
81 : struct 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 1 :
90 : struct hd_struct {
91 : sector_t start_sect;
92 : sector_t nr_sects;
93 : sector_t alignment_offset;
94 : unsigned int discard_alignment;
95 : struct device __dev;
96 : struct kobject *holder_dir;
97 : int policy, partno;
98 : #ifdef CONFIG_FAIL_MAKE_REQUEST
99 : int make_it_fail;
100 : #endif
101 : unsigned long stamp;
102 : int in_flight[2];
103 : #ifdef CONFIG_SMP
104 : struct disk_stats *dkstats;
105 : #else
106 : struct disk_stats dkstats;
107 : #endif
108 : struct rcu_head rcu_head;
109 : };
110 :
111 : #define GENHD_FL_REMOVABLE 1
112 : #define GENHD_FL_DRIVERFS 2
113 : #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
114 : #define GENHD_FL_CD 8
115 : #define GENHD_FL_UP 16
116 : #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
117 : #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
118 : #define GENHD_FL_NATIVE_CAPACITY 128
119 :
120 : #define BLK_SCSI_MAX_CMDS (256)
121 : #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
122 :
123 : struct blk_scsi_cmd_filter {
124 : unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
125 : unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
126 : struct kobject kobj;
127 : };
128 1 :
129 : struct disk_part_tbl {
130 : struct rcu_head rcu_head;
131 : int len;
132 : struct hd_struct *last_lookup;
133 : struct hd_struct *part[];
134 : };
135 2 :
136 : struct gendisk {
137 : /* major, first_minor and minors are input parameters only,
138 : * don't use directly. Use disk_devt() and disk_max_parts().
139 : */
140 : int major; /* major number of driver */
141 : int first_minor;
142 : int minors; /* maximum number of minors, =1 for
143 : * disks that can't be partitioned. */
144 :
145 : char disk_name[DISK_NAME_LEN]; /* name of major driver */
146 : char *(*devnode)(struct gendisk *gd, mode_t *mode);
147 : /* Array of pointers to partitions indexed by partno.
148 : * Protected with matching bdev lock but stat and other
149 : * non-critical accesses use RCU. Always access through
150 : * helpers.
151 : */
152 : struct disk_part_tbl *part_tbl;
153 : struct hd_struct part0;
154 :
155 : const struct block_device_operations *fops;
156 : struct request_queue *queue;
157 : void *private_data;
158 :
159 : int flags;
160 : struct device *driverfs_dev; // FIXME: remove
161 : struct kobject *slave_dir;
162 :
163 : struct timer_rand_state *random;
164 :
165 : atomic_t sync_io; /* RAID */
166 : struct work_struct async_notify;
167 : #ifdef CONFIG_BLK_DEV_INTEGRITY
168 : struct blk_integrity *integrity;
169 : #endif
170 : int node_id;
171 : };
172 :
173 : static inline struct gendisk *part_to_disk(struct hd_struct *part)
174 : {
175 : if (likely(part)) {
176 : if (part->partno)
177 : return dev_to_disk(part_to_dev(part)->parent);
178 : else
179 : return dev_to_disk(part_to_dev(part));
180 : }
181 : return NULL;
182 : }
183 :
184 : static inline int disk_max_parts(struct gendisk *disk)
185 : {
186 : if (disk->flags & GENHD_FL_EXT_DEVT)
187 : return DISK_MAX_PARTS;
188 : return disk->minors;
189 : }
190 :
191 : static inline bool disk_partitionable(struct gendisk *disk)
192 : {
193 : return disk_max_parts(disk) > 1;
194 : }
195 :
196 : static inline dev_t disk_devt(struct gendisk *disk)
197 : {
198 : return disk_to_dev(disk)->devt;
199 : }
200 :
201 : static inline dev_t part_devt(struct hd_struct *part)
202 : {
203 : return part_to_dev(part)->devt;
204 : }
205 :
206 : extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
207 :
208 : static inline void disk_put_part(struct hd_struct *part)
209 : {
210 : if (likely(part))
211 : put_device(part_to_dev(part));
212 : }
213 :
214 : /*
215 : * Smarter partition iterator without context limits.
216 : */
217 : #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
218 : #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
219 : #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
220 : #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
221 :
222 : struct disk_part_iter {
223 : struct gendisk *disk;
224 : struct hd_struct *part;
225 : int idx;
226 : unsigned int flags;
227 : };
228 :
229 : extern void disk_part_iter_init(struct disk_part_iter *piter,
230 : struct gendisk *disk, unsigned int flags);
231 : extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
232 : extern void disk_part_iter_exit(struct disk_part_iter *piter);
233 :
234 : extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
235 : sector_t sector);
236 :
237 : /*
238 : * Macros to operate on percpu disk statistics:
239 : *
240 : * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
241 : * and should be called between disk_stat_lock() and
242 : * disk_stat_unlock().
243 : *
244 : * part_stat_read() can be called at any time.
245 : *
246 : * part_stat_{add|set_all}() and {init|free}_part_stats are for
247 : * internal use only.
248 : */
249 : #ifdef CONFIG_SMP
250 : #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
251 : #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
252 :
253 : #define __part_stat_add(cpu, part, field, addnd) \
254 : (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
255 :
256 : #define part_stat_read(part, field) \
257 : ({ \
258 : typeof((part)->dkstats->field) res = 0; \
259 : unsigned int _cpu; \
260 : for_each_possible_cpu(_cpu) \
261 : res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
262 : res; \
263 : })
264 :
265 : static inline void part_stat_set_all(struct hd_struct *part, int value)
266 : {
267 : int i;
268 :
269 : for_each_possible_cpu(i)
270 : memset(per_cpu_ptr(part->dkstats, i), value,
271 : sizeof(struct disk_stats));
272 : }
273 :
274 : static inline int init_part_stats(struct hd_struct *part)
275 : {
276 : part->dkstats = alloc_percpu(struct disk_stats);
277 : if (!part->dkstats)
278 : return 0;
279 : return 1;
280 : }
281 :
282 : static inline void free_part_stats(struct hd_struct *part)
283 : {
284 : free_percpu(part->dkstats);
285 : }
286 :
287 : #else /* !CONFIG_SMP */
288 : #define part_stat_lock() ({ rcu_read_lock(); 0; })
289 : #define part_stat_unlock() rcu_read_unlock()
290 :
291 : #define __part_stat_add(cpu, part, field, addnd) \
292 : ((part)->dkstats.field += addnd)
293 :
294 : #define part_stat_read(part, field) ((part)->dkstats.field)
295 :
296 : static inline void part_stat_set_all(struct hd_struct *part, int value)
297 : {
298 : memset(&part->dkstats, value, sizeof(struct disk_stats));
299 : }
300 :
301 : static inline int init_part_stats(struct hd_struct *part)
302 : {
303 : return 1;
304 : }
305 :
306 : static inline void free_part_stats(struct hd_struct *part)
307 : {
308 : }
309 :
310 : #endif /* CONFIG_SMP */
311 :
312 : #define part_stat_add(cpu, part, field, addnd) do { \
313 : __part_stat_add((cpu), (part), field, addnd); \
314 : if ((part)->partno) \
315 : __part_stat_add((cpu), &part_to_disk((part))->part0, \
316 : field, addnd); \
317 : } while (0)
318 :
319 : #define part_stat_dec(cpu, gendiskp, field) \
320 : part_stat_add(cpu, gendiskp, field, -1)
321 : #define part_stat_inc(cpu, gendiskp, field) \
322 : part_stat_add(cpu, gendiskp, field, 1)
323 : #define part_stat_sub(cpu, gendiskp, field, subnd) \
324 : part_stat_add(cpu, gendiskp, field, -subnd)
325 :
326 : static inline void part_inc_in_flight(struct hd_struct *part, int rw)
327 : {
328 : part->in_flight[rw]++;
329 : if (part->partno)
330 : part_to_disk(part)->part0.in_flight[rw]++;
331 : }
332 :
333 : static inline void part_dec_in_flight(struct hd_struct *part, int rw)
334 : {
335 : part->in_flight[rw]--;
336 : if (part->partno)
337 : part_to_disk(part)->part0.in_flight[rw]--;
338 : }
339 :
340 : static inline int part_in_flight(struct hd_struct *part)
341 : {
342 : return part->in_flight[0] + part->in_flight[1];
343 : }
344 :
345 : /* block/blk-core.c */
346 : extern void part_round_stats(int cpu, struct hd_struct *part);
347 :
348 : /* block/genhd.c */
349 : extern void add_disk(struct gendisk *disk);
350 : extern void del_gendisk(struct gendisk *gp);
351 : extern void unlink_gendisk(struct gendisk *gp);
352 : extern struct gendisk *get_gendisk(dev_t dev, int *partno);
353 : extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
354 :
355 : extern void set_device_ro(struct block_device *bdev, int flag);
356 : extern void set_disk_ro(struct gendisk *disk, int flag);
357 :
358 : static inline int get_disk_ro(struct gendisk *disk)
359 : {
360 : return disk->part0.policy;
361 : }
362 :
363 : /* drivers/char/random.c */
364 : extern void add_disk_randomness(struct gendisk *disk);
365 : extern void rand_initialize_disk(struct gendisk *disk);
366 :
367 : static inline sector_t get_start_sect(struct block_device *bdev)
368 : {
369 : return bdev->bd_part->start_sect;
370 : }
371 : static inline sector_t get_capacity(struct gendisk *disk)
372 : {
373 : return disk->part0.nr_sects;
374 : }
375 : static inline void set_capacity(struct gendisk *disk, sector_t size)
376 : {
377 : disk->part0.nr_sects = size;
378 : }
379 :
380 : #ifdef CONFIG_SOLARIS_X86_PARTITION
381 :
382 : #define SOLARIS_X86_NUMSLICE 16
383 : #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
384 :
385 : struct solaris_x86_slice {
386 : __le16 s_tag; /* ID tag of partition */
387 : __le16 s_flag; /* permission flags */
388 : __le32 s_start; /* start sector no of partition */
389 : __le32 s_size; /* # of blocks in partition */
390 : };
391 :
392 : struct solaris_x86_vtoc {
393 : unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
394 : __le32 v_sanity; /* to verify vtoc sanity */
395 : __le32 v_version; /* layout version */
396 : char v_volume[8]; /* volume name */
397 : __le16 v_sectorsz; /* sector size in bytes */
398 : __le16 v_nparts; /* number of partitions */
399 : unsigned int v_reserved[10]; /* free space */
400 : struct solaris_x86_slice
401 : v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
402 : unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
403 : char v_asciilabel[128]; /* for compatibility */
404 : };
405 :
406 : #endif /* CONFIG_SOLARIS_X86_PARTITION */
407 :
408 : #ifdef CONFIG_BSD_DISKLABEL
409 : /*
410 : * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
411 : * updated by Marc Espie <Marc.Espie@openbsd.org>
412 : */
413 :
414 : /* check against BSD src/sys/sys/disklabel.h for consistency */
415 :
416 : #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
417 : #define BSD_MAXPARTITIONS 16
418 : #define OPENBSD_MAXPARTITIONS 16
419 : #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
420 : struct bsd_disklabel {
421 : __le32 d_magic; /* the magic number */
422 : __s16 d_type; /* drive type */
423 : __s16 d_subtype; /* controller/d_type specific */
424 : char d_typename[16]; /* type name, e.g. "eagle" */
425 : char d_packname[16]; /* pack identifier */
426 : __u32 d_secsize; /* # of bytes per sector */
427 : __u32 d_nsectors; /* # of data sectors per track */
428 : __u32 d_ntracks; /* # of tracks per cylinder */
429 : __u32 d_ncylinders; /* # of data cylinders per unit */
430 : __u32 d_secpercyl; /* # of data sectors per cylinder */
431 : __u32 d_secperunit; /* # of data sectors per unit */
432 : __u16 d_sparespertrack; /* # of spare sectors per track */
433 : __u16 d_sparespercyl; /* # of spare sectors per cylinder */
434 : __u32 d_acylinders; /* # of alt. cylinders per unit */
435 : __u16 d_rpm; /* rotational speed */
436 : __u16 d_interleave; /* hardware sector interleave */
437 : __u16 d_trackskew; /* sector 0 skew, per track */
438 : __u16 d_cylskew; /* sector 0 skew, per cylinder */
439 : __u32 d_headswitch; /* head switch time, usec */
440 : __u32 d_trkseek; /* track-to-track seek, usec */
441 : __u32 d_flags; /* generic flags */
442 : #define NDDATA 5
443 : __u32 d_drivedata[NDDATA]; /* drive-type specific information */
444 : #define NSPARE 5
445 : __u32 d_spare[NSPARE]; /* reserved for future use */
446 : __le32 d_magic2; /* the magic number (again) */
447 : __le16 d_checksum; /* xor of data incl. partitions */
448 :
449 : /* filesystem and partition information: */
450 : __le16 d_npartitions; /* number of partitions in following */
451 : __le32 d_bbsize; /* size of boot area at sn0, bytes */
452 : __le32 d_sbsize; /* max size of fs superblock, bytes */
453 : struct bsd_partition { /* the partition table */
454 : __le32 p_size; /* number of sectors in partition */
455 : __le32 p_offset; /* starting sector */
456 : __le32 p_fsize; /* filesystem basic fragment size */
457 : __u8 p_fstype; /* filesystem type, see below */
458 : __u8 p_frag; /* filesystem fragments per block */
459 : __le16 p_cpg; /* filesystem cylinders per group */
460 : } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
461 : };
462 :
463 : #endif /* CONFIG_BSD_DISKLABEL */
464 :
465 : #ifdef CONFIG_UNIXWARE_DISKLABEL
466 : /*
467 : * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
468 : * and Krzysztof G. Baranowski <kgb@knm.org.pl>
469 : */
470 :
471 : #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
472 : #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
473 : #define UNIXWARE_NUMSLICE 16
474 : #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
475 :
476 : struct unixware_slice {
477 : __le16 s_label; /* label */
478 : __le16 s_flags; /* permission flags */
479 : __le32 start_sect; /* starting sector */
480 : __le32 nr_sects; /* number of sectors in slice */
481 : };
482 :
483 : struct unixware_disklabel {
484 : __le32 d_type; /* drive type */
485 : __le32 d_magic; /* the magic number */
486 : __le32 d_version; /* version number */
487 : char d_serial[12]; /* serial number of the device */
488 : __le32 d_ncylinders; /* # of data cylinders per device */
489 : __le32 d_ntracks; /* # of tracks per cylinder */
490 : __le32 d_nsectors; /* # of data sectors per track */
491 : __le32 d_secsize; /* # of bytes per sector */
492 : __le32 d_part_start; /* # of first sector of this partition */
493 : __le32 d_unknown1[12]; /* ? */
494 : __le32 d_alt_tbl; /* byte offset of alternate table */
495 : __le32 d_alt_len; /* byte length of alternate table */
496 : __le32 d_phys_cyl; /* # of physical cylinders per device */
497 : __le32 d_phys_trk; /* # of physical tracks per cylinder */
498 : __le32 d_phys_sec; /* # of physical sectors per track */
499 : __le32 d_phys_bytes; /* # of physical bytes per sector */
500 : __le32 d_unknown2; /* ? */
501 : __le32 d_unknown3; /* ? */
502 : __le32 d_pad[8]; /* pad */
503 :
504 : struct unixware_vtoc {
505 : __le32 v_magic; /* the magic number */
506 : __le32 v_version; /* version number */
507 : char v_name[8]; /* volume name */
508 : __le16 v_nslices; /* # of slices */
509 : __le16 v_unknown1; /* ? */
510 : __le32 v_reserved[10]; /* reserved */
511 : struct unixware_slice
512 : v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
513 : } vtoc;
514 :
515 : }; /* 408 */
516 :
517 : #endif /* CONFIG_UNIXWARE_DISKLABEL */
518 :
519 : #ifdef CONFIG_MINIX_SUBPARTITION
520 : # define MINIX_NR_SUBPARTITIONS 4
521 : #endif /* CONFIG_MINIX_SUBPARTITION */
522 :
523 : #define ADDPART_FLAG_NONE 0
524 : #define ADDPART_FLAG_RAID 1
525 : #define ADDPART_FLAG_WHOLEDISK 2
526 :
527 : extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
528 : extern void blk_free_devt(dev_t devt);
529 : extern dev_t blk_lookup_devt(const char *name, int partno);
530 : extern char *disk_name (struct gendisk *hd, int partno, char *buf);
531 :
532 : extern int disk_expand_part_tbl(struct gendisk *disk, int target);
533 : extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
534 : extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
535 : int partno, sector_t start,
536 : sector_t len, int flags);
537 : extern void delete_partition(struct gendisk *, int);
538 : extern void printk_all_partitions(void);
539 :
540 : extern struct gendisk *alloc_disk_node(int minors, int node_id);
541 : extern struct gendisk *alloc_disk(int minors);
542 : extern struct kobject *get_disk(struct gendisk *disk);
543 : extern void put_disk(struct gendisk *disk);
544 : extern void blk_register_region(dev_t devt, unsigned long range,
545 : struct module *module,
546 : struct kobject *(*probe)(dev_t, int *, void *),
547 : int (*lock)(dev_t, void *),
548 : void *data);
549 : extern void blk_unregister_region(dev_t devt, unsigned long range);
550 :
551 : extern ssize_t part_size_show(struct device *dev,
552 : struct device_attribute *attr, char *buf);
553 : extern ssize_t part_stat_show(struct device *dev,
554 : struct device_attribute *attr, char *buf);
555 : extern ssize_t part_inflight_show(struct device *dev,
556 : struct device_attribute *attr, char *buf);
557 : #ifdef CONFIG_FAIL_MAKE_REQUEST
558 : extern ssize_t part_fail_show(struct device *dev,
559 : struct device_attribute *attr, char *buf);
560 : extern ssize_t part_fail_store(struct device *dev,
561 : struct device_attribute *attr,
562 : const char *buf, size_t count);
563 : #endif /* CONFIG_FAIL_MAKE_REQUEST */
564 :
565 : #else /* CONFIG_BLOCK */
566 :
567 : static inline void printk_all_partitions(void) { }
568 :
569 : static inline dev_t blk_lookup_devt(const char *name, int partno)
570 : {
571 : dev_t devt = MKDEV(0, 0);
572 : return devt;
573 : }
574 :
575 : #endif /* CONFIG_BLOCK */
576 :
577 : #endif /* _LINUX_GENHD_H */
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