Merge tag 'for-linus-20160523' of git://git.infradead.org/linux-mtd
[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>
6d1d8050 15#include <linux/slab.h>
6c71013e 16#include <linux/percpu-refcount.h>
63579785 17#include <linux/uuid.h>
1da177e4 18
9361401e
DH
19#ifdef CONFIG_BLOCK
20
548b10eb 21#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
ed9e1982 22#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
548b10eb 23#define disk_to_dev(disk) (&(disk)->part0.__dev)
ed9e1982 24#define part_to_dev(part) (&((part)->__dev))
edfaa7c3 25
edfaa7c3
KS
26extern struct device_type part_type;
27extern struct kobject *block_depr;
28extern struct class block_class;
29
1da177e4
LT
30enum {
31/* These three have identical behaviour; use the second one if DOS FDISK gets
32 confused about extended/logical partitions starting past cylinder 1023. */
33 DOS_EXTENDED_PARTITION = 5,
34 LINUX_EXTENDED_PARTITION = 0x85,
35 WIN98_EXTENDED_PARTITION = 0x0f,
36
d18d7682
FMDN
37 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
38
1da177e4 39 LINUX_SWAP_PARTITION = 0x82,
4419d1ac
OH
40 LINUX_DATA_PARTITION = 0x83,
41 LINUX_LVM_PARTITION = 0x8e,
1da177e4
LT
42 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
43
44 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
45 NEW_SOLARIS_X86_PARTITION = 0xbf,
46
47 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
48 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
49 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
50 EZD_PARTITION = 0x55, /* EZ-DRIVE */
51
52 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
53 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
54 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
55 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
56 MINIX_PARTITION = 0x81, /* Minix Partition ID */
57 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
58};
59
689d6fac 60#define DISK_MAX_PARTS 256
3e1a7ff8 61#define DISK_NAME_LEN 32
689d6fac 62
34186efc
DW
63#include <linux/major.h>
64#include <linux/device.h>
65#include <linux/smp.h>
66#include <linux/string.h>
67#include <linux/fs.h>
8ce7ad7b 68#include <linux/workqueue.h>
34186efc 69
1da177e4
LT
70struct partition {
71 unsigned char boot_ind; /* 0x80 - active */
72 unsigned char head; /* starting head */
73 unsigned char sector; /* starting sector */
74 unsigned char cyl; /* starting cylinder */
75 unsigned char sys_ind; /* What partition type */
76 unsigned char end_head; /* end head */
77 unsigned char end_sector; /* end sector */
78 unsigned char end_cyl; /* end cylinder */
79 __le32 start_sect; /* starting sector counting from 0 */
80 __le32 nr_sects; /* nr of sectors in partition */
81} __attribute__((packed));
82
ea5c48ab
JM
83struct disk_stats {
84 unsigned long sectors[2]; /* READs and WRITEs */
85 unsigned long ios[2];
86 unsigned long merges[2];
87 unsigned long ticks[2];
88 unsigned long io_ticks;
89 unsigned long time_in_queue;
90};
6d1d8050
WD
91
92#define PARTITION_META_INFO_VOLNAMELTH 64
1ad7e899
SW
93/*
94 * Enough for the string representation of any kind of UUID plus NULL.
95 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
96 */
63579785 97#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
6d1d8050
WD
98
99struct partition_meta_info {
1ad7e899 100 char uuid[PARTITION_META_INFO_UUIDLTH];
6d1d8050
WD
101 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
102};
103
1da177e4
LT
104struct hd_struct {
105 sector_t start_sect;
c83f6bf9
VG
106 /*
107 * nr_sects is protected by sequence counter. One might extend a
108 * partition while IO is happening to it and update of nr_sects
109 * can be non-atomic on 32bit machines with 64bit sector_t.
110 */
1da177e4 111 sector_t nr_sects;
c83f6bf9 112 seqcount_t nr_sects_seq;
c72758f3 113 sector_t alignment_offset;
a1706ac4 114 unsigned int discard_alignment;
ed9e1982 115 struct device __dev;
6a4d44c1 116 struct kobject *holder_dir;
1da177e4 117 int policy, partno;
6d1d8050 118 struct partition_meta_info *info;
c17bb495
AM
119#ifdef CONFIG_FAIL_MAKE_REQUEST
120 int make_it_fail;
ea5c48ab
JM
121#endif
122 unsigned long stamp;
1e9bb880 123 atomic_t in_flight[2];
ea5c48ab 124#ifdef CONFIG_SMP
43cf38eb 125 struct disk_stats __percpu *dkstats;
ea5c48ab
JM
126#else
127 struct disk_stats dkstats;
c17bb495 128#endif
6c71013e 129 struct percpu_ref ref;
e71bf0d0 130 struct rcu_head rcu_head;
1da177e4
LT
131};
132
133#define GENHD_FL_REMOVABLE 1
97fedbbe 134/* 2 is unused */
86ce18d7 135#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4
LT
136#define GENHD_FL_CD 8
137#define GENHD_FL_UP 16
138#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
689d6fac 139#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
db429e9e 140#define GENHD_FL_NATIVE_CAPACITY 128
d4dc210f 141#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
d27769ec 142#define GENHD_FL_NO_PART_SCAN 512
1da177e4 143
77ea887e
TH
144enum {
145 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
146 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
147};
148
540eed56
TH
149#define BLK_SCSI_MAX_CMDS (256)
150#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
151
152struct blk_scsi_cmd_filter {
153 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
154 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
155 struct kobject kobj;
156};
157
158struct disk_part_tbl {
159 struct rcu_head rcu_head;
160 int len;
4d2deb40
AB
161 struct hd_struct __rcu *last_lookup;
162 struct hd_struct __rcu *part[];
540eed56
TH
163};
164
77ea887e 165struct disk_events;
99e6608c 166struct badblocks;
77ea887e 167
25520d55
MP
168#if defined(CONFIG_BLK_DEV_INTEGRITY)
169
170struct blk_integrity {
171 struct blk_integrity_profile *profile;
172 unsigned char flags;
173 unsigned char tuple_size;
174 unsigned char interval_exp;
175 unsigned char tag_size;
176};
177
178#endif /* CONFIG_BLK_DEV_INTEGRITY */
179
1da177e4 180struct gendisk {
689d6fac
TH
181 /* major, first_minor and minors are input parameters only,
182 * don't use directly. Use disk_devt() and disk_max_parts().
f331c029 183 */
1da177e4
LT
184 int major; /* major number of driver */
185 int first_minor;
186 int minors; /* maximum number of minors, =1 for
187 * disks that can't be partitioned. */
f331c029 188
3e1a7ff8 189 char disk_name[DISK_NAME_LEN]; /* name of major driver */
2c9ede55 190 char *(*devnode)(struct gendisk *gd, umode_t *mode);
77ea887e
TH
191
192 unsigned int events; /* supported events */
193 unsigned int async_events; /* async events, subset of all */
194
b5d0b9df 195 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH
196 * Protected with matching bdev lock but stat and other
197 * non-critical accesses use RCU. Always access through
198 * helpers.
199 */
4d2deb40 200 struct disk_part_tbl __rcu *part_tbl;
b5d0b9df 201 struct hd_struct part0;
e71bf0d0 202
83d5cde4 203 const struct block_device_operations *fops;
1da177e4
LT
204 struct request_queue *queue;
205 void *private_data;
1da177e4
LT
206
207 int flags;
edfaa7c3 208 struct device *driverfs_dev; // FIXME: remove
6a4d44c1 209 struct kobject *slave_dir;
1da177e4
LT
210
211 struct timer_rand_state *random;
1da177e4 212 atomic_t sync_io; /* RAID */
77ea887e 213 struct disk_events *ev;
7ba1ba12 214#ifdef CONFIG_BLK_DEV_INTEGRITY
aff34e19 215 struct kobject integrity_kobj;
25520d55 216#endif /* CONFIG_BLK_DEV_INTEGRITY */
540eed56 217 int node_id;
99e6608c 218 struct badblocks *bb;
1da177e4
LT
219};
220
310a2c10
TH
221static inline struct gendisk *part_to_disk(struct hd_struct *part)
222{
548b10eb
TH
223 if (likely(part)) {
224 if (part->partno)
225 return dev_to_disk(part_to_dev(part)->parent);
226 else
227 return dev_to_disk(part_to_dev(part));
228 }
310a2c10
TH
229 return NULL;
230}
231
446d64e3
MZ
232static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
233{
63579785 234 uuid_be_to_bin(uuid_str, (uuid_be *)to);
446d64e3
MZ
235 return 0;
236}
237
f331c029
TH
238static inline int disk_max_parts(struct gendisk *disk)
239{
689d6fac
TH
240 if (disk->flags & GENHD_FL_EXT_DEVT)
241 return DISK_MAX_PARTS;
242 return disk->minors;
b5d0b9df
TH
243}
244
d27769ec 245static inline bool disk_part_scan_enabled(struct gendisk *disk)
b5d0b9df 246{
d27769ec
TH
247 return disk_max_parts(disk) > 1 &&
248 !(disk->flags & GENHD_FL_NO_PART_SCAN);
f331c029
TH
249}
250
251static inline dev_t disk_devt(struct gendisk *disk)
252{
ed9e1982 253 return disk_to_dev(disk)->devt;
f331c029
TH
254}
255
256static inline dev_t part_devt(struct hd_struct *part)
257{
ed9e1982 258 return part_to_dev(part)->devt;
f331c029
TH
259}
260
e71bf0d0
TH
261extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
262
263static inline void disk_put_part(struct hd_struct *part)
264{
265 if (likely(part))
ed9e1982 266 put_device(part_to_dev(part));
e71bf0d0
TH
267}
268
269/*
270 * Smarter partition iterator without context limits.
271 */
272#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
273#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df 274#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
71982a40 275#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
e71bf0d0
TH
276
277struct disk_part_iter {
278 struct gendisk *disk;
279 struct hd_struct *part;
280 int idx;
281 unsigned int flags;
282};
283
284extern void disk_part_iter_init(struct disk_part_iter *piter,
285 struct gendisk *disk, unsigned int flags);
286extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
287extern void disk_part_iter_exit(struct disk_part_iter *piter);
288
289extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
290 sector_t sector);
291
c9959059 292/*
1da177e4
LT
293 * Macros to operate on percpu disk statistics:
294 *
c9959059
TH
295 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
296 * and should be called between disk_stat_lock() and
297 * disk_stat_unlock().
298 *
299 * part_stat_read() can be called at any time.
300 *
301 * part_stat_{add|set_all}() and {init|free}_part_stats are for
302 * internal use only.
1da177e4
LT
303 */
304#ifdef CONFIG_SMP
074a7aca
TH
305#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
306#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
ea5c48ab 307
074a7aca
TH
308#define __part_stat_add(cpu, part, field, addnd) \
309 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
ea5c48ab
JM
310
311#define part_stat_read(part, field) \
312({ \
074a7aca 313 typeof((part)->dkstats->field) res = 0; \
7af92f87
SH
314 unsigned int _cpu; \
315 for_each_possible_cpu(_cpu) \
316 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
ea5c48ab
JM
317 res; \
318})
319
28f13702
JA
320static inline void part_stat_set_all(struct hd_struct *part, int value)
321{
ea5c48ab 322 int i;
28f13702 323
ea5c48ab
JM
324 for_each_possible_cpu(i)
325 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 326 sizeof(struct disk_stats));
ea5c48ab 327}
c9959059 328
074a7aca 329static inline int init_part_stats(struct hd_struct *part)
ea5c48ab 330{
074a7aca
TH
331 part->dkstats = alloc_percpu(struct disk_stats);
332 if (!part->dkstats)
333 return 0;
334 return 1;
1da177e4 335}
ea5c48ab 336
074a7aca 337static inline void free_part_stats(struct hd_struct *part)
ea5c48ab 338{
074a7aca 339 free_percpu(part->dkstats);
ea5c48ab
JM
340}
341
074a7aca
TH
342#else /* !CONFIG_SMP */
343#define part_stat_lock() ({ rcu_read_lock(); 0; })
344#define part_stat_unlock() rcu_read_unlock()
c9959059 345
074a7aca
TH
346#define __part_stat_add(cpu, part, field, addnd) \
347 ((part)->dkstats.field += addnd)
1da177e4 348
074a7aca 349#define part_stat_read(part, field) ((part)->dkstats.field)
1da177e4 350
074a7aca 351static inline void part_stat_set_all(struct hd_struct *part, int value)
1da177e4 352{
074a7aca 353 memset(&part->dkstats, value, sizeof(struct disk_stats));
1da177e4 354}
ea5c48ab
JM
355
356static inline int init_part_stats(struct hd_struct *part)
357{
ea5c48ab
JM
358 return 1;
359}
360
361static inline void free_part_stats(struct hd_struct *part)
362{
ea5c48ab
JM
363}
364
074a7aca 365#endif /* CONFIG_SMP */
1da177e4 366
074a7aca
TH
367#define part_stat_add(cpu, part, field, addnd) do { \
368 __part_stat_add((cpu), (part), field, addnd); \
369 if ((part)->partno) \
370 __part_stat_add((cpu), &part_to_disk((part))->part0, \
371 field, addnd); \
372} while (0)
ea5c48ab 373
074a7aca
TH
374#define part_stat_dec(cpu, gendiskp, field) \
375 part_stat_add(cpu, gendiskp, field, -1)
376#define part_stat_inc(cpu, gendiskp, field) \
377 part_stat_add(cpu, gendiskp, field, 1)
378#define part_stat_sub(cpu, gendiskp, field, subnd) \
379 part_stat_add(cpu, gendiskp, field, -subnd)
380
316d315b 381static inline void part_inc_in_flight(struct hd_struct *part, int rw)
ea5c48ab 382{
1e9bb880 383 atomic_inc(&part->in_flight[rw]);
074a7aca 384 if (part->partno)
1e9bb880 385 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
ea5c48ab
JM
386}
387
316d315b 388static inline void part_dec_in_flight(struct hd_struct *part, int rw)
ea5c48ab 389{
1e9bb880 390 atomic_dec(&part->in_flight[rw]);
074a7aca 391 if (part->partno)
1e9bb880 392 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
316d315b
NK
393}
394
395static inline int part_in_flight(struct hd_struct *part)
396{
1e9bb880 397 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
ea5c48ab 398}
1da177e4 399
6d1d8050
WD
400static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
401{
402 if (disk)
403 return kzalloc_node(sizeof(struct partition_meta_info),
404 GFP_KERNEL, disk->node_id);
405 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
406}
407
408static inline void free_part_info(struct hd_struct *part)
409{
410 kfree(part->info);
411}
412
d3992286 413/* block/blk-core.c */
c9959059 414extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4 415
32ca163c 416/* block/genhd.c */
1da177e4
LT
417extern void add_disk(struct gendisk *disk);
418extern void del_gendisk(struct gendisk *gp);
cf771cb5 419extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 420extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT
421
422extern void set_device_ro(struct block_device *bdev, int flag);
423extern void set_disk_ro(struct gendisk *disk, int flag);
424
b7db9956
TH
425static inline int get_disk_ro(struct gendisk *disk)
426{
427 return disk->part0.policy;
428}
429
77ea887e
TH
430extern void disk_block_events(struct gendisk *disk);
431extern void disk_unblock_events(struct gendisk *disk);
85ef06d1 432extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
77ea887e
TH
433extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
434
1da177e4
LT
435/* drivers/char/random.c */
436extern void add_disk_randomness(struct gendisk *disk);
437extern void rand_initialize_disk(struct gendisk *disk);
438
439static inline sector_t get_start_sect(struct block_device *bdev)
440{
0762b8bd 441 return bdev->bd_part->start_sect;
1da177e4
LT
442}
443static inline sector_t get_capacity(struct gendisk *disk)
444{
80795aef 445 return disk->part0.nr_sects;
1da177e4
LT
446}
447static inline void set_capacity(struct gendisk *disk, sector_t size)
448{
80795aef 449 disk->part0.nr_sects = size;
1da177e4
LT
450}
451
1da177e4
LT
452#ifdef CONFIG_SOLARIS_X86_PARTITION
453
b84d8796 454#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT
455#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
456
457struct solaris_x86_slice {
458 __le16 s_tag; /* ID tag of partition */
459 __le16 s_flag; /* permission flags */
460 __le32 s_start; /* start sector no of partition */
461 __le32 s_size; /* # of blocks in partition */
462};
463
464struct solaris_x86_vtoc {
465 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
466 __le32 v_sanity; /* to verify vtoc sanity */
467 __le32 v_version; /* layout version */
468 char v_volume[8]; /* volume name */
469 __le16 v_sectorsz; /* sector size in bytes */
470 __le16 v_nparts; /* number of partitions */
471 unsigned int v_reserved[10]; /* free space */
472 struct solaris_x86_slice
473 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
474 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
475 char v_asciilabel[128]; /* for compatibility */
476};
477
478#endif /* CONFIG_SOLARIS_X86_PARTITION */
479
480#ifdef CONFIG_BSD_DISKLABEL
481/*
482 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
483 * updated by Marc Espie <Marc.Espie@openbsd.org>
484 */
485
486/* check against BSD src/sys/sys/disklabel.h for consistency */
487
488#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
489#define BSD_MAXPARTITIONS 16
490#define OPENBSD_MAXPARTITIONS 16
491#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
492struct bsd_disklabel {
493 __le32 d_magic; /* the magic number */
494 __s16 d_type; /* drive type */
495 __s16 d_subtype; /* controller/d_type specific */
496 char d_typename[16]; /* type name, e.g. "eagle" */
497 char d_packname[16]; /* pack identifier */
498 __u32 d_secsize; /* # of bytes per sector */
499 __u32 d_nsectors; /* # of data sectors per track */
500 __u32 d_ntracks; /* # of tracks per cylinder */
501 __u32 d_ncylinders; /* # of data cylinders per unit */
502 __u32 d_secpercyl; /* # of data sectors per cylinder */
503 __u32 d_secperunit; /* # of data sectors per unit */
504 __u16 d_sparespertrack; /* # of spare sectors per track */
505 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
506 __u32 d_acylinders; /* # of alt. cylinders per unit */
507 __u16 d_rpm; /* rotational speed */
508 __u16 d_interleave; /* hardware sector interleave */
509 __u16 d_trackskew; /* sector 0 skew, per track */
510 __u16 d_cylskew; /* sector 0 skew, per cylinder */
511 __u32 d_headswitch; /* head switch time, usec */
512 __u32 d_trkseek; /* track-to-track seek, usec */
513 __u32 d_flags; /* generic flags */
514#define NDDATA 5
515 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
516#define NSPARE 5
517 __u32 d_spare[NSPARE]; /* reserved for future use */
518 __le32 d_magic2; /* the magic number (again) */
519 __le16 d_checksum; /* xor of data incl. partitions */
520
521 /* filesystem and partition information: */
522 __le16 d_npartitions; /* number of partitions in following */
523 __le32 d_bbsize; /* size of boot area at sn0, bytes */
524 __le32 d_sbsize; /* max size of fs superblock, bytes */
525 struct bsd_partition { /* the partition table */
526 __le32 p_size; /* number of sectors in partition */
527 __le32 p_offset; /* starting sector */
528 __le32 p_fsize; /* filesystem basic fragment size */
529 __u8 p_fstype; /* filesystem type, see below */
530 __u8 p_frag; /* filesystem fragments per block */
531 __le16 p_cpg; /* filesystem cylinders per group */
532 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
533};
534
535#endif /* CONFIG_BSD_DISKLABEL */
536
537#ifdef CONFIG_UNIXWARE_DISKLABEL
538/*
539 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
540 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
541 */
542
543#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
544#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
545#define UNIXWARE_NUMSLICE 16
546#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
547
548struct unixware_slice {
549 __le16 s_label; /* label */
550 __le16 s_flags; /* permission flags */
551 __le32 start_sect; /* starting sector */
552 __le32 nr_sects; /* number of sectors in slice */
553};
554
555struct unixware_disklabel {
556 __le32 d_type; /* drive type */
557 __le32 d_magic; /* the magic number */
558 __le32 d_version; /* version number */
559 char d_serial[12]; /* serial number of the device */
560 __le32 d_ncylinders; /* # of data cylinders per device */
561 __le32 d_ntracks; /* # of tracks per cylinder */
562 __le32 d_nsectors; /* # of data sectors per track */
563 __le32 d_secsize; /* # of bytes per sector */
564 __le32 d_part_start; /* # of first sector of this partition */
565 __le32 d_unknown1[12]; /* ? */
566 __le32 d_alt_tbl; /* byte offset of alternate table */
567 __le32 d_alt_len; /* byte length of alternate table */
568 __le32 d_phys_cyl; /* # of physical cylinders per device */
569 __le32 d_phys_trk; /* # of physical tracks per cylinder */
570 __le32 d_phys_sec; /* # of physical sectors per track */
571 __le32 d_phys_bytes; /* # of physical bytes per sector */
572 __le32 d_unknown2; /* ? */
573 __le32 d_unknown3; /* ? */
574 __le32 d_pad[8]; /* pad */
575
576 struct unixware_vtoc {
577 __le32 v_magic; /* the magic number */
578 __le32 v_version; /* version number */
579 char v_name[8]; /* volume name */
580 __le16 v_nslices; /* # of slices */
581 __le16 v_unknown1; /* ? */
582 __le32 v_reserved[10]; /* reserved */
583 struct unixware_slice
584 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
585 } vtoc;
586
587}; /* 408 */
588
589#endif /* CONFIG_UNIXWARE_DISKLABEL */
590
591#ifdef CONFIG_MINIX_SUBPARTITION
592# define MINIX_NR_SUBPARTITIONS 4
593#endif /* CONFIG_MINIX_SUBPARTITION */
594
d18d7682
FMDN
595#define ADDPART_FLAG_NONE 0
596#define ADDPART_FLAG_RAID 1
597#define ADDPART_FLAG_WHOLEDISK 2
598
bcce3de1
TH
599extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
600extern void blk_free_devt(dev_t devt);
cf771cb5
TH
601extern dev_t blk_lookup_devt(const char *name, int partno);
602extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4 603
540eed56 604extern int disk_expand_part_tbl(struct gendisk *disk, int target);
1da177e4 605extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
fe316bf2 606extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
ba32929a
TH
607extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
608 int partno, sector_t start,
6d1d8050
WD
609 sector_t len, int flags,
610 struct partition_meta_info
611 *info);
6c71013e 612extern void __delete_partition(struct percpu_ref *);
1da177e4 613extern void delete_partition(struct gendisk *, int);
dd2a345f 614extern void printk_all_partitions(void);
1da177e4 615
1946089a 616extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4
LT
617extern struct gendisk *alloc_disk(int minors);
618extern struct kobject *get_disk(struct gendisk *disk);
619extern void put_disk(struct gendisk *disk);
edfaa7c3 620extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT
621 struct module *module,
622 struct kobject *(*probe)(dev_t, int *, void *),
623 int (*lock)(dev_t, void *),
624 void *data);
edfaa7c3 625extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 626
e5610521
TH
627extern ssize_t part_size_show(struct device *dev,
628 struct device_attribute *attr, char *buf);
074a7aca
TH
629extern ssize_t part_stat_show(struct device *dev,
630 struct device_attribute *attr, char *buf);
316d315b
NK
631extern ssize_t part_inflight_show(struct device *dev,
632 struct device_attribute *attr, char *buf);
eddb2e26
TH
633#ifdef CONFIG_FAIL_MAKE_REQUEST
634extern ssize_t part_fail_show(struct device *dev,
635 struct device_attribute *attr, char *buf);
636extern ssize_t part_fail_store(struct device *dev,
637 struct device_attribute *attr,
638 const char *buf, size_t count);
639#endif /* CONFIG_FAIL_MAKE_REQUEST */
e5610521 640
6c71013e 641static inline int hd_ref_init(struct hd_struct *part)
6c23a968 642{
6c71013e
ML
643 if (percpu_ref_init(&part->ref, __delete_partition, 0,
644 GFP_KERNEL))
645 return -ENOMEM;
646 return 0;
6c23a968
JA
647}
648
649static inline void hd_struct_get(struct hd_struct *part)
650{
6c71013e 651 percpu_ref_get(&part->ref);
6c23a968
JA
652}
653
654static inline int hd_struct_try_get(struct hd_struct *part)
655{
6c71013e 656 return percpu_ref_tryget_live(&part->ref);
6c23a968
JA
657}
658
659static inline void hd_struct_put(struct hd_struct *part)
660{
6c71013e
ML
661 percpu_ref_put(&part->ref);
662}
663
664static inline void hd_struct_kill(struct hd_struct *part)
665{
666 percpu_ref_kill(&part->ref);
6c23a968
JA
667}
668
b54e5ed8
ML
669static inline void hd_free_part(struct hd_struct *part)
670{
671 free_part_stats(part);
672 free_part_info(part);
6c71013e 673 percpu_ref_exit(&part->ref);
b54e5ed8
ML
674}
675
c83f6bf9
VG
676/*
677 * Any access of part->nr_sects which is not protected by partition
678 * bd_mutex or gendisk bdev bd_mutex, should be done using this
679 * accessor function.
680 *
681 * Code written along the lines of i_size_read() and i_size_write().
682 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
683 * on.
684 */
685static inline sector_t part_nr_sects_read(struct hd_struct *part)
686{
687#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
688 sector_t nr_sects;
689 unsigned seq;
690 do {
691 seq = read_seqcount_begin(&part->nr_sects_seq);
692 nr_sects = part->nr_sects;
693 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
694 return nr_sects;
695#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
696 sector_t nr_sects;
697
698 preempt_disable();
699 nr_sects = part->nr_sects;
700 preempt_enable();
701 return nr_sects;
702#else
703 return part->nr_sects;
704#endif
705}
706
707/*
708 * Should be called with mutex lock held (typically bd_mutex) of partition
709 * to provide mutual exlusion among writers otherwise seqcount might be
710 * left in wrong state leaving the readers spinning infinitely.
711 */
712static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
713{
714#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
715 write_seqcount_begin(&part->nr_sects_seq);
716 part->nr_sects = size;
717 write_seqcount_end(&part->nr_sects_seq);
718#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
719 preempt_disable();
720 part->nr_sects = size;
721 preempt_enable();
722#else
723 part->nr_sects = size;
724#endif
725}
726
25520d55
MP
727#if defined(CONFIG_BLK_DEV_INTEGRITY)
728extern void blk_integrity_add(struct gendisk *);
729extern void blk_integrity_del(struct gendisk *);
730extern void blk_integrity_revalidate(struct gendisk *);
731#else /* CONFIG_BLK_DEV_INTEGRITY */
732static inline void blk_integrity_add(struct gendisk *disk) { }
733static inline void blk_integrity_del(struct gendisk *disk) { }
734static inline void blk_integrity_revalidate(struct gendisk *disk) { }
735#endif /* CONFIG_BLK_DEV_INTEGRITY */
736
87c1efbf
JA
737#else /* CONFIG_BLOCK */
738
739static inline void printk_all_partitions(void) { }
740
cf771cb5 741static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS
742{
743 dev_t devt = MKDEV(0, 0);
744 return devt;
745}
746
446d64e3
MZ
747static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
748{
749 return -EINVAL;
750}
87c1efbf 751#endif /* CONFIG_BLOCK */
9361401e 752
a8ae50ba 753#endif /* _LINUX_GENHD_H */