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block: unify sysfs size node handling
[linux-2.6-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
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
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 129
b5d0b9df 130 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH		 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;
b5d0b9df 136 struct hd_struct part0;
e71bf0d0 137
1da177e4
LT		 138 struct block_device_operations *fops;
139 struct request_queue *queue;
140 void *private_data;
1da177e4
LT		 141
142 int flags;
edfaa7c3 143 struct device *driverfs_dev; // FIXME: remove
6a4d44c1
JN		 144 struct kobject *holder_dir;
145 struct kobject *slave_dir;
1da177e4
LT		 146
147 struct timer_rand_state *random;
148 int policy;
149
150 atomic_t sync_io; /* RAID */
20e5c81f 151 unsigned long stamp;
1da177e4
LT		 152 int in_flight;
153#ifdef CONFIG_SMP
154 struct disk_stats *dkstats;
155#else
156 struct disk_stats dkstats;
157#endif
8ce7ad7b 158 struct work_struct async_notify;
7ba1ba12
MP		 159#ifdef CONFIG_BLK_DEV_INTEGRITY
160 struct blk_integrity *integrity;
161#endif
1da177e4
LT		 162};
163
310a2c10
TH		 164static inline struct gendisk *part_to_disk(struct hd_struct *part)
165{
548b10eb
TH		 166 if (likely(part)) {
167 if (part->partno)
168 return dev_to_disk(part_to_dev(part)->parent);
169 else
170 return dev_to_disk(part_to_dev(part));
171 }
310a2c10
TH		 172 return NULL;
173}
174
f331c029
TH		 175static inline int disk_max_parts(struct gendisk *disk)
176{
b5d0b9df
TH		 177 return disk->minors + disk->ext_minors;
178}
179
180static inline bool disk_partitionable(struct gendisk *disk)
181{
182 return disk_max_parts(disk) > 1;
f331c029
TH		 183}
184
185static inline dev_t disk_devt(struct gendisk *disk)
186{
ed9e1982 187 return disk_to_dev(disk)->devt;
f331c029
TH		 188}
189
190static inline dev_t part_devt(struct hd_struct *part)
191{
ed9e1982 192 return part_to_dev(part)->devt;
f331c029
TH		 193}
194
e71bf0d0
TH		 195extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
196
197static inline void disk_put_part(struct hd_struct *part)
198{
199 if (likely(part))
ed9e1982 200 put_device(part_to_dev(part));
e71bf0d0
TH		 201}
202
203/*
204 * Smarter partition iterator without context limits.
205 */
206#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
207#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df 208#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
e71bf0d0
TH		 209
210struct disk_part_iter {
211 struct gendisk *disk;
212 struct hd_struct *part;
213 int idx;
214 unsigned int flags;
215};
216
217extern void disk_part_iter_init(struct disk_part_iter *piter,
218 struct gendisk *disk, unsigned int flags);
219extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
220extern void disk_part_iter_exit(struct disk_part_iter *piter);
221
222extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
223 sector_t sector);
224
c9959059 225/*
1da177e4
LT		 226 * Macros to operate on percpu disk statistics:
227 *
c9959059
TH		 228 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
229 * and should be called between disk_stat_lock() and
230 * disk_stat_unlock().
231 *
232 * part_stat_read() can be called at any time.
233 *
234 * part_stat_{add|set_all}() and {init|free}_part_stats are for
235 * internal use only.
1da177e4
LT		 236 */
237#ifdef CONFIG_SMP
c9959059
TH		 238#define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); })
239#define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
240
241#define disk_stat_add(cpu, gendiskp, field, addnd) \
242 (per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd)
1da177e4
LT		 243
244#define disk_stat_read(gendiskp, field) \
245({ \
246 typeof(gendiskp->dkstats->field) res = 0; \
247 int i; \
0a945022 248 for_each_possible_cpu(i) \
1da177e4 249 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
1da177e4
LT		 250 res; \
251})
252
c9959059
TH		 253static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
254{
1da177e4 255 int i;
28f13702 256
0a945022 257 for_each_possible_cpu(i)
394e3902 258 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
28f13702 259 sizeof(struct disk_stats));
1da177e4 260}
ea5c48ab 261
c9959059
TH		 262#define part_stat_add(cpu, part, field, addnd) \
263 (per_cpu_ptr(part->dkstats, cpu)->field += addnd)
ea5c48ab 264
c9959059
TH		 265#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
266({ \
267 if (part) \
268 part_stat_add(cpu, part, field, addnd); \
269 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 270})
271
272#define part_stat_read(part, field) \
273({ \
274 typeof(part->dkstats->field) res = 0; \
275 int i; \
276 for_each_possible_cpu(i) \
277 res += per_cpu_ptr(part->dkstats, i)->field; \
278 res; \
279})
280
28f13702
JA		 281static inline void part_stat_set_all(struct hd_struct *part, int value)
282{
ea5c48ab 283 int i;
28f13702 284
ea5c48ab
JM		 285 for_each_possible_cpu(i)
286 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 287 sizeof(struct disk_stats));
ea5c48ab 288}
c9959059 289
a8ae50ba 290#else /* !CONFIG_SMP */
c9959059
TH		 291#define disk_stat_lock() ({ rcu_read_lock(); 0; })
292#define disk_stat_unlock() rcu_read_unlock()
293
294#define disk_stat_add(cpu, gendiskp, field, addnd) \
295 (gendiskp->dkstats.field += addnd)
1da177e4
LT		 296#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
297
ea5c48ab
JM		 298static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
299{
1da177e4
LT		 300 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
301}
ea5c48ab 302
c9959059 303#define part_stat_add(cpu, part, field, addnd) \
ea5c48ab
JM		 304 (part->dkstats.field += addnd)
305
c9959059
TH		 306#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
307({ \
308 if (part) \
309 part_stat_add(cpu, part, field, addnd); \
310 disk_stat_add(cpu, gendiskp, field, addnd); \
ea5c48ab
JM		 311})
312
313#define part_stat_read(part, field) (part->dkstats.field)
314
315static inline void part_stat_set_all(struct hd_struct *part, int value)
316{
317 memset(&part->dkstats, value, sizeof(struct disk_stats));
318}
319
a8ae50ba 320#endif /* CONFIG_SMP */
1da177e4 321
c9959059
TH		 322#define disk_stat_dec(cpu, gendiskp, field) \
323 disk_stat_add(cpu, gendiskp, field, -1)
324#define disk_stat_inc(cpu, gendiskp, field) \
325 disk_stat_add(cpu, gendiskp, field, 1)
326#define disk_stat_sub(cpu, gendiskp, field, subnd) \
327 disk_stat_add(cpu, gendiskp, field, -subnd)
328
329#define part_stat_dec(cpu, gendiskp, field) \
330 part_stat_add(cpu, gendiskp, field, -1)
331#define part_stat_inc(cpu, gendiskp, field) \
332 part_stat_add(cpu, gendiskp, field, 1)
333#define part_stat_sub(cpu, gendiskp, field, subnd) \
334 part_stat_add(cpu, gendiskp, field, -subnd)
335
336#define all_stat_dec(cpu, gendiskp, field, sector) \
337 all_stat_add(cpu, gendiskp, field, -1, sector)
338#define all_stat_inc(cpu, gendiskp, part, field, sector) \
339 all_stat_add(cpu, gendiskp, part, field, 1, sector)
340#define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \
341 all_stat_add(cpu, gendiskp, part, field, -subnd, sector)
1da177e4
LT		 342
343/* Inlines to alloc and free disk stats in struct gendisk */
344#ifdef CONFIG_SMP
345static inline int init_disk_stats(struct gendisk *disk)
346{
347 disk->dkstats = alloc_percpu(struct disk_stats);
348 if (!disk->dkstats)
349 return 0;
350 return 1;
351}
352
353static inline void free_disk_stats(struct gendisk *disk)
354{
355 free_percpu(disk->dkstats);
356}
ea5c48ab
JM		 357
358static inline int init_part_stats(struct hd_struct *part)
359{
360 part->dkstats = alloc_percpu(struct disk_stats);
361 if (!part->dkstats)
362 return 0;
363 return 1;
364}
365
366static inline void free_part_stats(struct hd_struct *part)
367{
368 free_percpu(part->dkstats);
369}
370
1da177e4
LT		 371#else /* CONFIG_SMP */
372static inline int init_disk_stats(struct gendisk *disk)
373{
374 return 1;
375}
376
377static inline void free_disk_stats(struct gendisk *disk)
378{
379}
ea5c48ab
JM		 380
381static inline int init_part_stats(struct hd_struct *part)
382{
383 return 1;
384}
385
386static inline void free_part_stats(struct hd_struct *part)
387{
388}
1da177e4
LT		 389#endif /* CONFIG_SMP */
390
391/* drivers/block/ll_rw_blk.c */
c9959059
TH		 392extern void disk_round_stats(int cpu, struct gendisk *disk);
393extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4
LT		 394
395/* drivers/block/genhd.c */
ac20427e 396extern int get_blkdev_list(char *, int);
1da177e4
LT		 397extern void add_disk(struct gendisk *disk);
398extern void del_gendisk(struct gendisk *gp);
399extern void unlink_gendisk(struct gendisk *gp);
cf771cb5 400extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 401extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 402
403extern void set_device_ro(struct block_device *bdev, int flag);
404extern void set_disk_ro(struct gendisk *disk, int flag);
405
406/* drivers/char/random.c */
407extern void add_disk_randomness(struct gendisk *disk);
408extern void rand_initialize_disk(struct gendisk *disk);
409
410static inline sector_t get_start_sect(struct block_device *bdev)
411{
412 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
413}
414static inline sector_t get_capacity(struct gendisk *disk)
415{
80795aef 416 return disk->part0.nr_sects;
1da177e4
LT		 417}
418static inline void set_capacity(struct gendisk *disk, sector_t size)
419{
80795aef 420 disk->part0.nr_sects = size;
1da177e4
LT		 421}
422
1da177e4
LT		 423#ifdef CONFIG_SOLARIS_X86_PARTITION
424
b84d8796 425#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 426#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
427
428struct solaris_x86_slice {
429 __le16 s_tag; /* ID tag of partition */
430 __le16 s_flag; /* permission flags */
431 __le32 s_start; /* start sector no of partition */
432 __le32 s_size; /* # of blocks in partition */
433};
434
435struct solaris_x86_vtoc {
436 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
437 __le32 v_sanity; /* to verify vtoc sanity */
438 __le32 v_version; /* layout version */
439 char v_volume[8]; /* volume name */
440 __le16 v_sectorsz; /* sector size in bytes */
441 __le16 v_nparts; /* number of partitions */
442 unsigned int v_reserved[10]; /* free space */
443 struct solaris_x86_slice
444 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
445 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
446 char v_asciilabel[128]; /* for compatibility */
447};
448
449#endif /* CONFIG_SOLARIS_X86_PARTITION */
450
451#ifdef CONFIG_BSD_DISKLABEL
452/*
453 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
454 * updated by Marc Espie <Marc.Espie@openbsd.org>
455 */
456
457/* check against BSD src/sys/sys/disklabel.h for consistency */
458
459#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
460#define BSD_MAXPARTITIONS 16
461#define OPENBSD_MAXPARTITIONS 16
462#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
463struct bsd_disklabel {
464 __le32 d_magic; /* the magic number */
465 __s16 d_type; /* drive type */
466 __s16 d_subtype; /* controller/d_type specific */
467 char d_typename[16]; /* type name, e.g. "eagle" */
468 char d_packname[16]; /* pack identifier */
469 __u32 d_secsize; /* # of bytes per sector */
470 __u32 d_nsectors; /* # of data sectors per track */
471 __u32 d_ntracks; /* # of tracks per cylinder */
472 __u32 d_ncylinders; /* # of data cylinders per unit */
473 __u32 d_secpercyl; /* # of data sectors per cylinder */
474 __u32 d_secperunit; /* # of data sectors per unit */
475 __u16 d_sparespertrack; /* # of spare sectors per track */
476 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
477 __u32 d_acylinders; /* # of alt. cylinders per unit */
478 __u16 d_rpm; /* rotational speed */
479 __u16 d_interleave; /* hardware sector interleave */
480 __u16 d_trackskew; /* sector 0 skew, per track */
481 __u16 d_cylskew; /* sector 0 skew, per cylinder */
482 __u32 d_headswitch; /* head switch time, usec */
483 __u32 d_trkseek; /* track-to-track seek, usec */
484 __u32 d_flags; /* generic flags */
485#define NDDATA 5
486 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
487#define NSPARE 5
488 __u32 d_spare[NSPARE]; /* reserved for future use */
489 __le32 d_magic2; /* the magic number (again) */
490 __le16 d_checksum; /* xor of data incl. partitions */
491
492 /* filesystem and partition information: */
493 __le16 d_npartitions; /* number of partitions in following */
494 __le32 d_bbsize; /* size of boot area at sn0, bytes */
495 __le32 d_sbsize; /* max size of fs superblock, bytes */
496 struct bsd_partition { /* the partition table */
497 __le32 p_size; /* number of sectors in partition */
498 __le32 p_offset; /* starting sector */
499 __le32 p_fsize; /* filesystem basic fragment size */
500 __u8 p_fstype; /* filesystem type, see below */
501 __u8 p_frag; /* filesystem fragments per block */
502 __le16 p_cpg; /* filesystem cylinders per group */
503 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
504};
505
506#endif /* CONFIG_BSD_DISKLABEL */
507
508#ifdef CONFIG_UNIXWARE_DISKLABEL
509/*
510 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
511 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
512 */
513
514#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
515#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
516#define UNIXWARE_NUMSLICE 16
517#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
518
519struct unixware_slice {
520 __le16 s_label; /* label */
521 __le16 s_flags; /* permission flags */
522 __le32 start_sect; /* starting sector */
523 __le32 nr_sects; /* number of sectors in slice */
524};
525
526struct unixware_disklabel {
527 __le32 d_type; /* drive type */
528 __le32 d_magic; /* the magic number */
529 __le32 d_version; /* version number */
530 char d_serial[12]; /* serial number of the device */
531 __le32 d_ncylinders; /* # of data cylinders per device */
532 __le32 d_ntracks; /* # of tracks per cylinder */
533 __le32 d_nsectors; /* # of data sectors per track */
534 __le32 d_secsize; /* # of bytes per sector */
535 __le32 d_part_start; /* # of first sector of this partition */
536 __le32 d_unknown1[12]; /* ? */
537 __le32 d_alt_tbl; /* byte offset of alternate table */
538 __le32 d_alt_len; /* byte length of alternate table */
539 __le32 d_phys_cyl; /* # of physical cylinders per device */
540 __le32 d_phys_trk; /* # of physical tracks per cylinder */
541 __le32 d_phys_sec; /* # of physical sectors per track */
542 __le32 d_phys_bytes; /* # of physical bytes per sector */
543 __le32 d_unknown2; /* ? */
544 __le32 d_unknown3; /* ? */
545 __le32 d_pad[8]; /* pad */
546
547 struct unixware_vtoc {
548 __le32 v_magic; /* the magic number */
549 __le32 v_version; /* version number */
550 char v_name[8]; /* volume name */
551 __le16 v_nslices; /* # of slices */
552 __le16 v_unknown1; /* ? */
553 __le32 v_reserved[10]; /* reserved */
554 struct unixware_slice
555 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
556 } vtoc;
557
558}; /* 408 */
559
560#endif /* CONFIG_UNIXWARE_DISKLABEL */
561
562#ifdef CONFIG_MINIX_SUBPARTITION
563# define MINIX_NR_SUBPARTITIONS 4
564#endif /* CONFIG_MINIX_SUBPARTITION */
565
d18d7682
FMDN		 566#define ADDPART_FLAG_NONE 0
567#define ADDPART_FLAG_RAID 1
568#define ADDPART_FLAG_WHOLEDISK 2
569
bcce3de1
TH		 570extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
571extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 572extern dev_t blk_lookup_devt(const char *name, int partno);
573extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4
LT		 574
575extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
d805dda4 576extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4 577extern void delete_partition(struct gendisk *, int);
dd2a345f 578extern void printk_all_partitions(void);
1da177e4 579
1946089a 580extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 581extern struct gendisk *alloc_disk(int minors);
bcce3de1
TH		 582extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
583 int node_id);
584extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
1da177e4
LT		 585extern struct kobject *get_disk(struct gendisk *disk);
586extern void put_disk(struct gendisk *disk);
edfaa7c3 587extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 588 struct module *module,
589 struct kobject *(*probe)(dev_t, int *, void *),
590 int (*lock)(dev_t, void *),
591 void *data);
edfaa7c3 592extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 593
e5610521
TH		 594extern ssize_t part_size_show(struct device *dev,
595 struct device_attribute *attr, char *buf);
596
87c1efbf
JA		 597#else /* CONFIG_BLOCK */
598
599static inline void printk_all_partitions(void) { }
600
cf771cb5 601static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS		 602{
603 dev_t devt = MKDEV(0, 0);
604 return devt;
605}
606
87c1efbf 607#endif /* CONFIG_BLOCK */
9361401e 608
a8ae50ba 609#endif /* _LINUX_GENHD_H */
Linux 6.x block layer and io_uring tree(s)