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Merge tag '9p-for-4.20' of git://github.com/martinetd/linux
[linux-block.git] / include / linux / genhd.h
CommitLineData
b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
1da177e4
LT		 2#ifndef _LINUX_GENHD_H
3#define _LINUX_GENHD_H
4
5/*
6 * genhd.h Copyright (C) 1992 Drew Eckhardt
7 * Generic hard disk header file by
8 * Drew Eckhardt
9 *
10 * <drew@colorado.edu>
11 */
12
1da177e4 13#include <linux/types.h>
edfaa7c3 14#include <linux/kdev_t.h>
e71bf0d0 15#include <linux/rcupdate.h>
6d1d8050 16#include <linux/slab.h>
6c71013e 17#include <linux/percpu-refcount.h>
63579785 18#include <linux/uuid.h>
dbae2c55 19#include <linux/blk_types.h>
1da177e4 20
9361401e
DH		 21#ifdef CONFIG_BLOCK
22
548b10eb 23#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
ed9e1982 24#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
548b10eb 25#define disk_to_dev(disk) (&(disk)->part0.__dev)
ed9e1982 26#define part_to_dev(part) (&((part)->__dev))
edfaa7c3 27
edfaa7c3
KS		 28extern struct device_type part_type;
29extern struct kobject *block_depr;
30extern struct class block_class;
31
1da177e4
LT		 32enum {
33/* These three have identical behaviour; use the second one if DOS FDISK gets
34 confused about extended/logical partitions starting past cylinder 1023. */
35 DOS_EXTENDED_PARTITION = 5,
36 LINUX_EXTENDED_PARTITION = 0x85,
37 WIN98_EXTENDED_PARTITION = 0x0f,
38
d18d7682
FMDN		 39 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
40
1da177e4 41 LINUX_SWAP_PARTITION = 0x82,
4419d1ac
OH		 42 LINUX_DATA_PARTITION = 0x83,
43 LINUX_LVM_PARTITION = 0x8e,
1da177e4
LT		 44 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
45
46 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
47 NEW_SOLARIS_X86_PARTITION = 0xbf,
48
49 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
50 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
51 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
52 EZD_PARTITION = 0x55, /* EZ-DRIVE */
53
54 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
55 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
56 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
57 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
58 MINIX_PARTITION = 0x81, /* Minix Partition ID */
59 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
60};
61
689d6fac 62#define DISK_MAX_PARTS 256
3e1a7ff8 63#define DISK_NAME_LEN 32
689d6fac 64
34186efc
DW		 65#include <linux/major.h>
66#include <linux/device.h>
67#include <linux/smp.h>
68#include <linux/string.h>
69#include <linux/fs.h>
8ce7ad7b 70#include <linux/workqueue.h>
34186efc 71
1da177e4
LT		 72struct partition {
73 unsigned char boot_ind; /* 0x80 - active */
74 unsigned char head; /* starting head */
75 unsigned char sector; /* starting sector */
76 unsigned char cyl; /* starting cylinder */
77 unsigned char sys_ind; /* What partition type */
78 unsigned char end_head; /* end head */
79 unsigned char end_sector; /* end sector */
80 unsigned char end_cyl; /* end cylinder */
81 __le32 start_sect; /* starting sector counting from 0 */
82 __le32 nr_sects; /* nr of sectors in partition */
83} __attribute__((packed));
84
ea5c48ab 85struct disk_stats {
b57e99b4 86 u64 nsecs[NR_STAT_GROUPS];
dbae2c55
MC		 87 unsigned long sectors[NR_STAT_GROUPS];
88 unsigned long ios[NR_STAT_GROUPS];
89 unsigned long merges[NR_STAT_GROUPS];
ea5c48ab
JM		 90 unsigned long io_ticks;
91 unsigned long time_in_queue;
92};
6d1d8050
WD		 93
94#define PARTITION_META_INFO_VOLNAMELTH 64
1ad7e899
SW		 95/*
96 * Enough for the string representation of any kind of UUID plus NULL.
97 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
98 */
63579785 99#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
6d1d8050
WD		 100
101struct partition_meta_info {
1ad7e899 102 char uuid[PARTITION_META_INFO_UUIDLTH];
6d1d8050
WD		 103 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
104};
105
1da177e4
LT		 106struct hd_struct {
107 sector_t start_sect;
c83f6bf9
VG		 108 /*
109 * nr_sects is protected by sequence counter. One might extend a
110 * partition while IO is happening to it and update of nr_sects
111 * can be non-atomic on 32bit machines with 64bit sector_t.
112 */
1da177e4 113 sector_t nr_sects;
c83f6bf9 114 seqcount_t nr_sects_seq;
c72758f3 115 sector_t alignment_offset;
a1706ac4 116 unsigned int discard_alignment;
ed9e1982 117 struct device __dev;
6a4d44c1 118 struct kobject *holder_dir;
1da177e4 119 int policy, partno;
6d1d8050 120 struct partition_meta_info *info;
c17bb495
AM		 121#ifdef CONFIG_FAIL_MAKE_REQUEST
122 int make_it_fail;
ea5c48ab
JM		 123#endif
124 unsigned long stamp;
1e9bb880 125 atomic_t in_flight[2];
ea5c48ab 126#ifdef CONFIG_SMP
43cf38eb 127 struct disk_stats __percpu *dkstats;
ea5c48ab
JM		 128#else
129 struct disk_stats dkstats;
c17bb495 130#endif
6c71013e 131 struct percpu_ref ref;
e71bf0d0 132 struct rcu_head rcu_head;
1da177e4
LT		 133};
134
135#define GENHD_FL_REMOVABLE 1
97fedbbe 136/* 2 is unused */
86ce18d7 137#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4
LT		 138#define GENHD_FL_CD 8
139#define GENHD_FL_UP 16
140#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
689d6fac 141#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
db429e9e 142#define GENHD_FL_NATIVE_CAPACITY 128
d4dc210f 143#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
d27769ec 144#define GENHD_FL_NO_PART_SCAN 512
8ddcd653 145#define GENHD_FL_HIDDEN 1024
1da177e4 146
77ea887e
TH		 147enum {
148 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
149 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
150};
151
540eed56
TH		 152struct disk_part_tbl {
153 struct rcu_head rcu_head;
154 int len;
4d2deb40
AB		 155 struct hd_struct __rcu *last_lookup;
156 struct hd_struct __rcu *part[];
540eed56
TH		 157};
158
77ea887e 159struct disk_events;
99e6608c 160struct badblocks;
77ea887e 161
25520d55
MP		 162#if defined(CONFIG_BLK_DEV_INTEGRITY)
163
164struct blk_integrity {
869ab90f
EB		 165 const struct blk_integrity_profile *profile;
166 unsigned char flags;
167 unsigned char tuple_size;
168 unsigned char interval_exp;
169 unsigned char tag_size;
25520d55
MP		 170};
171
172#endif /* CONFIG_BLK_DEV_INTEGRITY */
173
1da177e4 174struct gendisk {
689d6fac
TH		 175 /* major, first_minor and minors are input parameters only,
176 * don't use directly. Use disk_devt() and disk_max_parts().
f331c029 177 */
1da177e4
LT		 178 int major; /* major number of driver */
179 int first_minor;
180 int minors; /* maximum number of minors, =1 for
181 * disks that can't be partitioned. */
f331c029 182
3e1a7ff8 183 char disk_name[DISK_NAME_LEN]; /* name of major driver */
2c9ede55 184 char *(*devnode)(struct gendisk *gd, umode_t *mode);
77ea887e
TH		 185
186 unsigned int events; /* supported events */
187 unsigned int async_events; /* async events, subset of all */
188
b5d0b9df 189 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH		 190 * Protected with matching bdev lock but stat and other
191 * non-critical accesses use RCU. Always access through
192 * helpers.
193 */
4d2deb40 194 struct disk_part_tbl __rcu *part_tbl;
b5d0b9df 195 struct hd_struct part0;
e71bf0d0 196
83d5cde4 197 const struct block_device_operations *fops;
1da177e4
LT		 198 struct request_queue *queue;
199 void *private_data;
1da177e4
LT		 200
201 int flags;
56c0908c 202 struct rw_semaphore lookup_sem;
6a4d44c1 203 struct kobject *slave_dir;
1da177e4
LT		 204
205 struct timer_rand_state *random;
1da177e4 206 atomic_t sync_io; /* RAID */
77ea887e 207 struct disk_events *ev;
7ba1ba12 208#ifdef CONFIG_BLK_DEV_INTEGRITY
aff34e19 209 struct kobject integrity_kobj;
25520d55 210#endif /* CONFIG_BLK_DEV_INTEGRITY */
540eed56 211 int node_id;
99e6608c 212 struct badblocks *bb;
e319e1fb 213 struct lockdep_map lockdep_map;
1da177e4
LT		 214};
215
310a2c10
TH		 216static inline struct gendisk *part_to_disk(struct hd_struct *part)
217{
548b10eb
TH		 218 if (likely(part)) {
219 if (part->partno)
220 return dev_to_disk(part_to_dev(part)->parent);
221 else
222 return dev_to_disk(part_to_dev(part));
223 }
310a2c10
TH		 224 return NULL;
225}
226
f331c029
TH		 227static inline int disk_max_parts(struct gendisk *disk)
228{
689d6fac
TH		 229 if (disk->flags & GENHD_FL_EXT_DEVT)
230 return DISK_MAX_PARTS;
231 return disk->minors;
b5d0b9df
TH		 232}
233
d27769ec 234static inline bool disk_part_scan_enabled(struct gendisk *disk)
b5d0b9df 235{
d27769ec
TH		 236 return disk_max_parts(disk) > 1 &&
237 !(disk->flags & GENHD_FL_NO_PART_SCAN);
f331c029
TH		 238}
239
240static inline dev_t disk_devt(struct gendisk *disk)
241{
517bf3c3 242 return MKDEV(disk->major, disk->first_minor);
f331c029
TH		 243}
244
245static inline dev_t part_devt(struct hd_struct *part)
246{
ed9e1982 247 return part_to_dev(part)->devt;
f331c029
TH		 248}
249
67f2519f 250extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
e71bf0d0
TH		 251extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
252
253static inline void disk_put_part(struct hd_struct *part)
254{
255 if (likely(part))
ed9e1982 256 put_device(part_to_dev(part));
e71bf0d0
TH		 257}
258
259/*
260 * Smarter partition iterator without context limits.
261 */
262#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
263#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df 264#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
71982a40 265#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
e71bf0d0
TH		 266
267struct disk_part_iter {
268 struct gendisk *disk;
269 struct hd_struct *part;
270 int idx;
271 unsigned int flags;
272};
273
274extern void disk_part_iter_init(struct disk_part_iter *piter,
275 struct gendisk *disk, unsigned int flags);
276extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
277extern void disk_part_iter_exit(struct disk_part_iter *piter);
278
279extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
280 sector_t sector);
281
c9959059 282/*
1da177e4
LT		 283 * Macros to operate on percpu disk statistics:
284 *
c9959059
TH		 285 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
286 * and should be called between disk_stat_lock() and
287 * disk_stat_unlock().
288 *
289 * part_stat_read() can be called at any time.
290 *
291 * part_stat_{add|set_all}() and {init|free}_part_stats are for
292 * internal use only.
1da177e4
LT		 293 */
294#ifdef CONFIG_SMP
074a7aca
TH		 295#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
296#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
ea5c48ab 297
074a7aca
TH		 298#define __part_stat_add(cpu, part, field, addnd) \
299 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
ea5c48ab
JM		 300
301#define part_stat_read(part, field) \
302({ \
074a7aca 303 typeof((part)->dkstats->field) res = 0; \
7af92f87
SH		 304 unsigned int _cpu; \
305 for_each_possible_cpu(_cpu) \
306 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
ea5c48ab
JM		 307 res; \
308})
309
28f13702
JA		 310static inline void part_stat_set_all(struct hd_struct *part, int value)
311{
ea5c48ab 312 int i;
28f13702 313
ea5c48ab
JM		 314 for_each_possible_cpu(i)
315 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 316 sizeof(struct disk_stats));
ea5c48ab 317}
c9959059 318
074a7aca 319static inline int init_part_stats(struct hd_struct *part)
ea5c48ab 320{
074a7aca
TH		 321 part->dkstats = alloc_percpu(struct disk_stats);
322 if (!part->dkstats)
323 return 0;
324 return 1;
1da177e4 325}
ea5c48ab 326
074a7aca 327static inline void free_part_stats(struct hd_struct *part)
ea5c48ab 328{
074a7aca 329 free_percpu(part->dkstats);
ea5c48ab
JM		 330}
331
074a7aca
TH		 332#else /* !CONFIG_SMP */
333#define part_stat_lock() ({ rcu_read_lock(); 0; })
334#define part_stat_unlock() rcu_read_unlock()
c9959059 335
074a7aca
TH		 336#define __part_stat_add(cpu, part, field, addnd) \
337 ((part)->dkstats.field += addnd)
1da177e4 338
074a7aca 339#define part_stat_read(part, field) ((part)->dkstats.field)
1da177e4 340
074a7aca 341static inline void part_stat_set_all(struct hd_struct *part, int value)
1da177e4 342{
074a7aca 343 memset(&part->dkstats, value, sizeof(struct disk_stats));
1da177e4 344}
ea5c48ab
JM		 345
346static inline int init_part_stats(struct hd_struct *part)
347{
ea5c48ab
JM		 348 return 1;
349}
350
351static inline void free_part_stats(struct hd_struct *part)
352{
ea5c48ab
JM		 353}
354
074a7aca 355#endif /* CONFIG_SMP */
1da177e4 356
b57e99b4
OS		 357#define part_stat_read_msecs(part, which) \
358 div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC)
359
59767fbd 360#define part_stat_read_accum(part, field) \
dbae2c55 361 (part_stat_read(part, field[STAT_READ]) + \
bdca3c87
MC		 362 part_stat_read(part, field[STAT_WRITE]) + \
363 part_stat_read(part, field[STAT_DISCARD]))
59767fbd 364
074a7aca
TH		 365#define part_stat_add(cpu, part, field, addnd) do { \
366 __part_stat_add((cpu), (part), field, addnd); \
367 if ((part)->partno) \
368 __part_stat_add((cpu), &part_to_disk((part))->part0, \
369 field, addnd); \
370} while (0)
ea5c48ab 371
074a7aca
TH		 372#define part_stat_dec(cpu, gendiskp, field) \
373 part_stat_add(cpu, gendiskp, field, -1)
374#define part_stat_inc(cpu, gendiskp, field) \
375 part_stat_add(cpu, gendiskp, field, 1)
376#define part_stat_sub(cpu, gendiskp, field, subnd) \
377 part_stat_add(cpu, gendiskp, field, -subnd)
378
f299b7c7 379void part_in_flight(struct request_queue *q, struct hd_struct *part,
bf0ddaba
OS		 380 unsigned int inflight[2]);
381void part_in_flight_rw(struct request_queue *q, struct hd_struct *part,
382 unsigned int inflight[2]);
f299b7c7
JA		 383void part_dec_in_flight(struct request_queue *q, struct hd_struct *part,
384 int rw);
385void part_inc_in_flight(struct request_queue *q, struct hd_struct *part,
386 int rw);
1da177e4 387
6d1d8050
WD		 388static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
389{
390 if (disk)
391 return kzalloc_node(sizeof(struct partition_meta_info),
392 GFP_KERNEL, disk->node_id);
393 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
394}
395
396static inline void free_part_info(struct hd_struct *part)
397{
398 kfree(part->info);
399}
400
d3992286 401/* block/blk-core.c */
d62e26b3 402extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part);
1da177e4 403
32ca163c 404/* block/genhd.c */
fef912bf
HR		 405extern void device_add_disk(struct device *parent, struct gendisk *disk,
406 const struct attribute_group **groups);
e63a46be
DW		 407static inline void add_disk(struct gendisk *disk)
408{
fef912bf 409 device_add_disk(NULL, disk, NULL);
e63a46be 410}
fa70d2e2
MS		 411extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
412static inline void add_disk_no_queue_reg(struct gendisk *disk)
413{
414 device_add_disk_no_queue_reg(NULL, disk);
415}
e63a46be 416
1da177e4 417extern void del_gendisk(struct gendisk *gp);
cf771cb5 418extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 419extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 420
421extern void set_device_ro(struct block_device *bdev, int flag);
422extern void set_disk_ro(struct gendisk *disk, int flag);
423
b7db9956
TH		 424static inline int get_disk_ro(struct gendisk *disk)
425{
426 return disk->part0.policy;
427}
428
77ea887e
TH		 429extern void disk_block_events(struct gendisk *disk);
430extern void disk_unblock_events(struct gendisk *disk);
85ef06d1 431extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
77ea887e
TH		 432extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
433
1da177e4 434/* drivers/char/random.c */
0766f788 435extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
1da177e4
LT		 436extern void rand_initialize_disk(struct gendisk *disk);
437
438static inline sector_t get_start_sect(struct block_device *bdev)
439{
0762b8bd 440 return bdev->bd_part->start_sect;
1da177e4
LT		 441}
442static inline sector_t get_capacity(struct gendisk *disk)
443{
80795aef 444 return disk->part0.nr_sects;
1da177e4
LT		 445}
446static inline void set_capacity(struct gendisk *disk, sector_t size)
447{
80795aef 448 disk->part0.nr_sects = size;
1da177e4
LT		 449}
450
1da177e4
LT		 451#ifdef CONFIG_SOLARIS_X86_PARTITION
452
b84d8796 453#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 454#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
455
456struct solaris_x86_slice {
457 __le16 s_tag; /* ID tag of partition */
458 __le16 s_flag; /* permission flags */
459 __le32 s_start; /* start sector no of partition */
460 __le32 s_size; /* # of blocks in partition */
461};
462
463struct solaris_x86_vtoc {
464 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
465 __le32 v_sanity; /* to verify vtoc sanity */
466 __le32 v_version; /* layout version */
467 char v_volume[8]; /* volume name */
468 __le16 v_sectorsz; /* sector size in bytes */
469 __le16 v_nparts; /* number of partitions */
470 unsigned int v_reserved[10]; /* free space */
471 struct solaris_x86_slice
472 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
473 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
474 char v_asciilabel[128]; /* for compatibility */
475};
476
477#endif /* CONFIG_SOLARIS_X86_PARTITION */
478
479#ifdef CONFIG_BSD_DISKLABEL
480/*
481 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
482 * updated by Marc Espie <Marc.Espie@openbsd.org>
483 */
484
485/* check against BSD src/sys/sys/disklabel.h for consistency */
486
487#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
488#define BSD_MAXPARTITIONS 16
489#define OPENBSD_MAXPARTITIONS 16
490#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
491struct bsd_disklabel {
492 __le32 d_magic; /* the magic number */
493 __s16 d_type; /* drive type */
494 __s16 d_subtype; /* controller/d_type specific */
495 char d_typename[16]; /* type name, e.g. "eagle" */
496 char d_packname[16]; /* pack identifier */
497 __u32 d_secsize; /* # of bytes per sector */
498 __u32 d_nsectors; /* # of data sectors per track */
499 __u32 d_ntracks; /* # of tracks per cylinder */
500 __u32 d_ncylinders; /* # of data cylinders per unit */
501 __u32 d_secpercyl; /* # of data sectors per cylinder */
502 __u32 d_secperunit; /* # of data sectors per unit */
503 __u16 d_sparespertrack; /* # of spare sectors per track */
504 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
505 __u32 d_acylinders; /* # of alt. cylinders per unit */
506 __u16 d_rpm; /* rotational speed */
507 __u16 d_interleave; /* hardware sector interleave */
508 __u16 d_trackskew; /* sector 0 skew, per track */
509 __u16 d_cylskew; /* sector 0 skew, per cylinder */
510 __u32 d_headswitch; /* head switch time, usec */
511 __u32 d_trkseek; /* track-to-track seek, usec */
512 __u32 d_flags; /* generic flags */
513#define NDDATA 5
514 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
515#define NSPARE 5
516 __u32 d_spare[NSPARE]; /* reserved for future use */
517 __le32 d_magic2; /* the magic number (again) */
518 __le16 d_checksum; /* xor of data incl. partitions */
519
520 /* filesystem and partition information: */
521 __le16 d_npartitions; /* number of partitions in following */
522 __le32 d_bbsize; /* size of boot area at sn0, bytes */
523 __le32 d_sbsize; /* max size of fs superblock, bytes */
524 struct bsd_partition { /* the partition table */
525 __le32 p_size; /* number of sectors in partition */
526 __le32 p_offset; /* starting sector */
527 __le32 p_fsize; /* filesystem basic fragment size */
528 __u8 p_fstype; /* filesystem type, see below */
529 __u8 p_frag; /* filesystem fragments per block */
530 __le16 p_cpg; /* filesystem cylinders per group */
531 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
532};
533
534#endif /* CONFIG_BSD_DISKLABEL */
535
536#ifdef CONFIG_UNIXWARE_DISKLABEL
537/*
538 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
539 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
540 */
541
542#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
543#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
544#define UNIXWARE_NUMSLICE 16
545#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
546
547struct unixware_slice {
548 __le16 s_label; /* label */
549 __le16 s_flags; /* permission flags */
550 __le32 start_sect; /* starting sector */
551 __le32 nr_sects; /* number of sectors in slice */
552};
553
554struct unixware_disklabel {
555 __le32 d_type; /* drive type */
556 __le32 d_magic; /* the magic number */
557 __le32 d_version; /* version number */
558 char d_serial[12]; /* serial number of the device */
559 __le32 d_ncylinders; /* # of data cylinders per device */
560 __le32 d_ntracks; /* # of tracks per cylinder */
561 __le32 d_nsectors; /* # of data sectors per track */
562 __le32 d_secsize; /* # of bytes per sector */
563 __le32 d_part_start; /* # of first sector of this partition */
564 __le32 d_unknown1[12]; /* ? */
565 __le32 d_alt_tbl; /* byte offset of alternate table */
566 __le32 d_alt_len; /* byte length of alternate table */
567 __le32 d_phys_cyl; /* # of physical cylinders per device */
568 __le32 d_phys_trk; /* # of physical tracks per cylinder */
569 __le32 d_phys_sec; /* # of physical sectors per track */
570 __le32 d_phys_bytes; /* # of physical bytes per sector */
571 __le32 d_unknown2; /* ? */
572 __le32 d_unknown3; /* ? */
573 __le32 d_pad[8]; /* pad */
574
575 struct unixware_vtoc {
576 __le32 v_magic; /* the magic number */
577 __le32 v_version; /* version number */
578 char v_name[8]; /* volume name */
579 __le16 v_nslices; /* # of slices */
580 __le16 v_unknown1; /* ? */
581 __le32 v_reserved[10]; /* reserved */
582 struct unixware_slice
583 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
584 } vtoc;
585
586}; /* 408 */
587
588#endif /* CONFIG_UNIXWARE_DISKLABEL */
589
590#ifdef CONFIG_MINIX_SUBPARTITION
591# define MINIX_NR_SUBPARTITIONS 4
592#endif /* CONFIG_MINIX_SUBPARTITION */
593
d18d7682
FMDN		 594#define ADDPART_FLAG_NONE 0
595#define ADDPART_FLAG_RAID 1
596#define ADDPART_FLAG_WHOLEDISK 2
597
bcce3de1
TH		 598extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
599extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 600extern dev_t blk_lookup_devt(const char *name, int partno);
601extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4 602
540eed56 603extern int disk_expand_part_tbl(struct gendisk *disk, int target);
1da177e4 604extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
fe316bf2 605extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
ba32929a
TH		 606extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
607 int partno, sector_t start,
6d1d8050
WD		 608 sector_t len, int flags,
609 struct partition_meta_info
610 *info);
6c71013e 611extern void __delete_partition(struct percpu_ref *);
1da177e4 612extern void delete_partition(struct gendisk *, int);
dd2a345f 613extern void printk_all_partitions(void);
1da177e4 614
e319e1fb 615extern struct gendisk *__alloc_disk_node(int minors, int node_id);
3079c22e 616extern struct kobject *get_disk_and_module(struct gendisk *disk);
1da177e4 617extern void put_disk(struct gendisk *disk);
9df6c299 618extern void put_disk_and_module(struct gendisk *disk);
edfaa7c3 619extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 620 struct module *module,
621 struct kobject *(*probe)(dev_t, int *, void *),
622 int (*lock)(dev_t, void *),
623 void *data);
edfaa7c3 624extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 625
e5610521
TH		 626extern ssize_t part_size_show(struct device *dev,
627 struct device_attribute *attr, char *buf);
074a7aca
TH		 628extern ssize_t part_stat_show(struct device *dev,
629 struct device_attribute *attr, char *buf);
316d315b
NK		 630extern ssize_t part_inflight_show(struct device *dev,
631 struct device_attribute *attr, char *buf);
eddb2e26
TH		 632#ifdef CONFIG_FAIL_MAKE_REQUEST
633extern ssize_t part_fail_show(struct device *dev,
634 struct device_attribute *attr, char *buf);
635extern ssize_t part_fail_store(struct device *dev,
636 struct device_attribute *attr,
637 const char *buf, size_t count);
638#endif /* CONFIG_FAIL_MAKE_REQUEST */
e5610521 639
e319e1fb
BP		 640#define alloc_disk_node(minors, node_id) \
641({ \
642 static struct lock_class_key __key; \
643 const char *__name; \
644 struct gendisk *__disk; \
645 \
646 __name = "(gendisk_completion)"#minors"("#node_id")"; \
647 \
648 __disk = __alloc_disk_node(minors, node_id); \
649 \
650 if (__disk) \
651 lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
652 \
653 __disk; \
654})
655
656#define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
657
6c71013e 658static inline int hd_ref_init(struct hd_struct *part)
6c23a968 659{
6c71013e
ML		 660 if (percpu_ref_init(&part->ref, __delete_partition, 0,
661 GFP_KERNEL))
662 return -ENOMEM;
663 return 0;
6c23a968
JA		 664}
665
666static inline void hd_struct_get(struct hd_struct *part)
667{
6c71013e 668 percpu_ref_get(&part->ref);
6c23a968
JA		 669}
670
671static inline int hd_struct_try_get(struct hd_struct *part)
672{
6c71013e 673 return percpu_ref_tryget_live(&part->ref);
6c23a968
JA		 674}
675
676static inline void hd_struct_put(struct hd_struct *part)
677{
6c71013e
ML		 678 percpu_ref_put(&part->ref);
679}
680
681static inline void hd_struct_kill(struct hd_struct *part)
682{
683 percpu_ref_kill(&part->ref);
6c23a968
JA		 684}
685
b54e5ed8
ML		 686static inline void hd_free_part(struct hd_struct *part)
687{
688 free_part_stats(part);
689 free_part_info(part);
6c71013e 690 percpu_ref_exit(&part->ref);
b54e5ed8
ML		 691}
692
c83f6bf9
VG		 693/*
694 * Any access of part->nr_sects which is not protected by partition
695 * bd_mutex or gendisk bdev bd_mutex, should be done using this
696 * accessor function.
697 *
698 * Code written along the lines of i_size_read() and i_size_write().
699 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
700 * on.
701 */
702static inline sector_t part_nr_sects_read(struct hd_struct *part)
703{
704#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
705 sector_t nr_sects;
706 unsigned seq;
707 do {
708 seq = read_seqcount_begin(&part->nr_sects_seq);
709 nr_sects = part->nr_sects;
710 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
711 return nr_sects;
712#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
713 sector_t nr_sects;
714
715 preempt_disable();
716 nr_sects = part->nr_sects;
717 preempt_enable();
718 return nr_sects;
719#else
720 return part->nr_sects;
721#endif
722}
723
724/*
725 * Should be called with mutex lock held (typically bd_mutex) of partition
726 * to provide mutual exlusion among writers otherwise seqcount might be
727 * left in wrong state leaving the readers spinning infinitely.
728 */
729static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
730{
731#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
732 write_seqcount_begin(&part->nr_sects_seq);
733 part->nr_sects = size;
734 write_seqcount_end(&part->nr_sects_seq);
735#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
736 preempt_disable();
737 part->nr_sects = size;
738 preempt_enable();
739#else
740 part->nr_sects = size;
741#endif
742}
743
25520d55
MP		 744#if defined(CONFIG_BLK_DEV_INTEGRITY)
745extern void blk_integrity_add(struct gendisk *);
746extern void blk_integrity_del(struct gendisk *);
25520d55
MP		 747#else /* CONFIG_BLK_DEV_INTEGRITY */
748static inline void blk_integrity_add(struct gendisk *disk) { }
749static inline void blk_integrity_del(struct gendisk *disk) { }
25520d55
MP		 750#endif /* CONFIG_BLK_DEV_INTEGRITY */
751
87c1efbf
JA		 752#else /* CONFIG_BLOCK */
753
754static inline void printk_all_partitions(void) { }
755
cf771cb5 756static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS		 757{
758 dev_t devt = MKDEV(0, 0);
759 return devt;
760}
87c1efbf 761#endif /* CONFIG_BLOCK */
9361401e 762
a8ae50ba 763#endif /* _LINUX_GENHD_H */
Linux 6.x block layer and io_uring tree(s)