projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'drm-intel-fixes-2016-05-02' of git://anongit.freedesktop.org/drm-intel...
[deliverable/linux.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>
1da177e4 17
9361401e
DH		 18#ifdef CONFIG_BLOCK
19
548b10eb 20#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
ed9e1982 21#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
548b10eb 22#define disk_to_dev(disk) (&(disk)->part0.__dev)
ed9e1982 23#define part_to_dev(part) (&((part)->__dev))
edfaa7c3 24
edfaa7c3
KS		 25extern struct device_type part_type;
26extern struct kobject *block_depr;
27extern struct class block_class;
28
1da177e4
LT		 29enum {
30/* These three have identical behaviour; use the second one if DOS FDISK gets
31 confused about extended/logical partitions starting past cylinder 1023. */
32 DOS_EXTENDED_PARTITION = 5,
33 LINUX_EXTENDED_PARTITION = 0x85,
34 WIN98_EXTENDED_PARTITION = 0x0f,
35
d18d7682
FMDN		 36 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
37
1da177e4 38 LINUX_SWAP_PARTITION = 0x82,
4419d1ac
OH		 39 LINUX_DATA_PARTITION = 0x83,
40 LINUX_LVM_PARTITION = 0x8e,
1da177e4
LT		 41 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
42
43 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
44 NEW_SOLARIS_X86_PARTITION = 0xbf,
45
46 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
47 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
48 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
49 EZD_PARTITION = 0x55, /* EZ-DRIVE */
50
51 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
52 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
53 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
54 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
55 MINIX_PARTITION = 0x81, /* Minix Partition ID */
56 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
57};
58
689d6fac 59#define DISK_MAX_PARTS 256
3e1a7ff8 60#define DISK_NAME_LEN 32
689d6fac 61
34186efc
DW		 62#include <linux/major.h>
63#include <linux/device.h>
64#include <linux/smp.h>
65#include <linux/string.h>
66#include <linux/fs.h>
8ce7ad7b 67#include <linux/workqueue.h>
34186efc 68
1da177e4
LT		 69struct partition {
70 unsigned char boot_ind; /* 0x80 - active */
71 unsigned char head; /* starting head */
72 unsigned char sector; /* starting sector */
73 unsigned char cyl; /* starting cylinder */
74 unsigned char sys_ind; /* What partition type */
75 unsigned char end_head; /* end head */
76 unsigned char end_sector; /* end sector */
77 unsigned char end_cyl; /* end cylinder */
78 __le32 start_sect; /* starting sector counting from 0 */
79 __le32 nr_sects; /* nr of sectors in partition */
80} __attribute__((packed));
81
ea5c48ab
JM		 82struct disk_stats {
83 unsigned long sectors[2]; /* READs and WRITEs */
84 unsigned long ios[2];
85 unsigned long merges[2];
86 unsigned long ticks[2];
87 unsigned long io_ticks;
88 unsigned long time_in_queue;
89};
6d1d8050
WD		 90
91#define PARTITION_META_INFO_VOLNAMELTH 64
1ad7e899
SW		 92/*
93 * Enough for the string representation of any kind of UUID plus NULL.
94 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
95 */
96#define PARTITION_META_INFO_UUIDLTH 37
6d1d8050
WD		 97
98struct partition_meta_info {
1ad7e899 99 char uuid[PARTITION_META_INFO_UUIDLTH];
6d1d8050
WD		 100 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
101};
102
1da177e4
LT		 103struct hd_struct {
104 sector_t start_sect;
c83f6bf9
VG		 105 /*
106 * nr_sects is protected by sequence counter. One might extend a
107 * partition while IO is happening to it and update of nr_sects
108 * can be non-atomic on 32bit machines with 64bit sector_t.
109 */
1da177e4 110 sector_t nr_sects;
c83f6bf9 111 seqcount_t nr_sects_seq;
c72758f3 112 sector_t alignment_offset;
a1706ac4 113 unsigned int discard_alignment;
ed9e1982 114 struct device __dev;
6a4d44c1 115 struct kobject *holder_dir;
1da177e4 116 int policy, partno;
6d1d8050 117 struct partition_meta_info *info;
c17bb495
AM		 118#ifdef CONFIG_FAIL_MAKE_REQUEST
119 int make_it_fail;
ea5c48ab
JM		 120#endif
121 unsigned long stamp;
1e9bb880 122 atomic_t in_flight[2];
ea5c48ab 123#ifdef CONFIG_SMP
43cf38eb 124 struct disk_stats __percpu *dkstats;
ea5c48ab
JM		 125#else
126 struct disk_stats dkstats;
c17bb495 127#endif
6c71013e 128 struct percpu_ref ref;
e71bf0d0 129 struct rcu_head rcu_head;
1da177e4
LT		 130};
131
132#define GENHD_FL_REMOVABLE 1
97fedbbe 133/* 2 is unused */
86ce18d7 134#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4
LT		 135#define GENHD_FL_CD 8
136#define GENHD_FL_UP 16
137#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
689d6fac 138#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
db429e9e 139#define GENHD_FL_NATIVE_CAPACITY 128
d4dc210f 140#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
d27769ec 141#define GENHD_FL_NO_PART_SCAN 512
1da177e4 142
77ea887e
TH		 143enum {
144 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
145 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
146};
147
540eed56
TH		 148#define BLK_SCSI_MAX_CMDS (256)
149#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
150
151struct blk_scsi_cmd_filter {
152 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
153 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
154 struct kobject kobj;
155};
156
157struct disk_part_tbl {
158 struct rcu_head rcu_head;
159 int len;
4d2deb40
AB		 160 struct hd_struct __rcu *last_lookup;
161 struct hd_struct __rcu *part[];
540eed56
TH		 162};
163
77ea887e 164struct disk_events;
99e6608c 165struct badblocks;
77ea887e 166
25520d55
MP		 167#if defined(CONFIG_BLK_DEV_INTEGRITY)
168
169struct blk_integrity {
170 struct blk_integrity_profile *profile;
171 unsigned char flags;
172 unsigned char tuple_size;
173 unsigned char interval_exp;
174 unsigned char tag_size;
175};
176
177#endif /* CONFIG_BLK_DEV_INTEGRITY */
178
1da177e4 179struct gendisk {
689d6fac
TH		 180 /* major, first_minor and minors are input parameters only,
181 * don't use directly. Use disk_devt() and disk_max_parts().
f331c029 182 */
1da177e4
LT		 183 int major; /* major number of driver */
184 int first_minor;
185 int minors; /* maximum number of minors, =1 for
186 * disks that can't be partitioned. */
f331c029 187
3e1a7ff8 188 char disk_name[DISK_NAME_LEN]; /* name of major driver */
2c9ede55 189 char *(*devnode)(struct gendisk *gd, umode_t *mode);
77ea887e
TH		 190
191 unsigned int events; /* supported events */
192 unsigned int async_events; /* async events, subset of all */
193
b5d0b9df 194 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH		 195 * Protected with matching bdev lock but stat and other
196 * non-critical accesses use RCU. Always access through
197 * helpers.
198 */
4d2deb40 199 struct disk_part_tbl __rcu *part_tbl;
b5d0b9df 200 struct hd_struct part0;
e71bf0d0 201
83d5cde4 202 const struct block_device_operations *fops;
1da177e4
LT		 203 struct request_queue *queue;
204 void *private_data;
1da177e4
LT		 205
206 int flags;
edfaa7c3 207 struct device *driverfs_dev; // FIXME: remove
6a4d44c1 208 struct kobject *slave_dir;
1da177e4
LT		 209
210 struct timer_rand_state *random;
1da177e4 211 atomic_t sync_io; /* RAID */
77ea887e 212 struct disk_events *ev;
7ba1ba12 213#ifdef CONFIG_BLK_DEV_INTEGRITY
aff34e19 214 struct kobject integrity_kobj;
25520d55 215#endif /* CONFIG_BLK_DEV_INTEGRITY */
540eed56 216 int node_id;
99e6608c 217 struct badblocks *bb;
1da177e4
LT		 218};
219
310a2c10
TH		 220static inline struct gendisk *part_to_disk(struct hd_struct *part)
221{
548b10eb
TH		 222 if (likely(part)) {
223 if (part->partno)
224 return dev_to_disk(part_to_dev(part)->parent);
225 else
226 return dev_to_disk(part_to_dev(part));
227 }
310a2c10
TH		 228 return NULL;
229}
230
6d1d8050
WD		 231static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
232{
233 int i;
234 for (i = 0; i < 16; ++i) {
235 *to++ = (hex_to_bin(*uuid_str) << 4) |
236 (hex_to_bin(*(uuid_str + 1)));
237 uuid_str += 2;
238 switch (i) {
239 case 3:
240 case 5:
241 case 7:
242 case 9:
243 uuid_str++;
244 continue;
245 }
246 }
247}
248
446d64e3
MZ		 249static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
250{
251 part_pack_uuid(uuid_str, to);
252 return 0;
253}
254
f331c029
TH		 255static inline int disk_max_parts(struct gendisk *disk)
256{
689d6fac
TH		 257 if (disk->flags & GENHD_FL_EXT_DEVT)
258 return DISK_MAX_PARTS;
259 return disk->minors;
b5d0b9df
TH		 260}
261
d27769ec 262static inline bool disk_part_scan_enabled(struct gendisk *disk)
b5d0b9df 263{
d27769ec
TH		 264 return disk_max_parts(disk) > 1 &&
265 !(disk->flags & GENHD_FL_NO_PART_SCAN);
f331c029
TH		 266}
267
268static inline dev_t disk_devt(struct gendisk *disk)
269{
ed9e1982 270 return disk_to_dev(disk)->devt;
f331c029
TH		 271}
272
273static inline dev_t part_devt(struct hd_struct *part)
274{
ed9e1982 275 return part_to_dev(part)->devt;
f331c029
TH		 276}
277
e71bf0d0
TH		 278extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
279
280static inline void disk_put_part(struct hd_struct *part)
281{
282 if (likely(part))
ed9e1982 283 put_device(part_to_dev(part));
e71bf0d0
TH		 284}
285
286/*
287 * Smarter partition iterator without context limits.
288 */
289#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
290#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df 291#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
71982a40 292#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
e71bf0d0
TH		 293
294struct disk_part_iter {
295 struct gendisk *disk;
296 struct hd_struct *part;
297 int idx;
298 unsigned int flags;
299};
300
301extern void disk_part_iter_init(struct disk_part_iter *piter,
302 struct gendisk *disk, unsigned int flags);
303extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
304extern void disk_part_iter_exit(struct disk_part_iter *piter);
305
306extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
307 sector_t sector);
308
c9959059 309/*
1da177e4
LT		 310 * Macros to operate on percpu disk statistics:
311 *
c9959059
TH		 312 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
313 * and should be called between disk_stat_lock() and
314 * disk_stat_unlock().
315 *
316 * part_stat_read() can be called at any time.
317 *
318 * part_stat_{add|set_all}() and {init|free}_part_stats are for
319 * internal use only.
1da177e4
LT		 320 */
321#ifdef CONFIG_SMP
074a7aca
TH		 322#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
323#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
ea5c48ab 324
074a7aca
TH		 325#define __part_stat_add(cpu, part, field, addnd) \
326 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
ea5c48ab
JM		 327
328#define part_stat_read(part, field) \
329({ \
074a7aca 330 typeof((part)->dkstats->field) res = 0; \
7af92f87
SH		 331 unsigned int _cpu; \
332 for_each_possible_cpu(_cpu) \
333 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
ea5c48ab
JM		 334 res; \
335})
336
28f13702
JA		 337static inline void part_stat_set_all(struct hd_struct *part, int value)
338{
ea5c48ab 339 int i;
28f13702 340
ea5c48ab
JM		 341 for_each_possible_cpu(i)
342 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 343 sizeof(struct disk_stats));
ea5c48ab 344}
c9959059 345
074a7aca 346static inline int init_part_stats(struct hd_struct *part)
ea5c48ab 347{
074a7aca
TH		 348 part->dkstats = alloc_percpu(struct disk_stats);
349 if (!part->dkstats)
350 return 0;
351 return 1;
1da177e4 352}
ea5c48ab 353
074a7aca 354static inline void free_part_stats(struct hd_struct *part)
ea5c48ab 355{
074a7aca 356 free_percpu(part->dkstats);
ea5c48ab
JM		 357}
358
074a7aca
TH		 359#else /* !CONFIG_SMP */
360#define part_stat_lock() ({ rcu_read_lock(); 0; })
361#define part_stat_unlock() rcu_read_unlock()
c9959059 362
074a7aca
TH		 363#define __part_stat_add(cpu, part, field, addnd) \
364 ((part)->dkstats.field += addnd)
1da177e4 365
074a7aca 366#define part_stat_read(part, field) ((part)->dkstats.field)
1da177e4 367
074a7aca 368static inline void part_stat_set_all(struct hd_struct *part, int value)
1da177e4 369{
074a7aca 370 memset(&part->dkstats, value, sizeof(struct disk_stats));
1da177e4 371}
ea5c48ab
JM		 372
373static inline int init_part_stats(struct hd_struct *part)
374{
ea5c48ab
JM		 375 return 1;
376}
377
378static inline void free_part_stats(struct hd_struct *part)
379{
ea5c48ab
JM		 380}
381
074a7aca 382#endif /* CONFIG_SMP */
1da177e4 383
074a7aca
TH		 384#define part_stat_add(cpu, part, field, addnd) do { \
385 __part_stat_add((cpu), (part), field, addnd); \
386 if ((part)->partno) \
387 __part_stat_add((cpu), &part_to_disk((part))->part0, \
388 field, addnd); \
389} while (0)
ea5c48ab 390
074a7aca
TH		 391#define part_stat_dec(cpu, gendiskp, field) \
392 part_stat_add(cpu, gendiskp, field, -1)
393#define part_stat_inc(cpu, gendiskp, field) \
394 part_stat_add(cpu, gendiskp, field, 1)
395#define part_stat_sub(cpu, gendiskp, field, subnd) \
396 part_stat_add(cpu, gendiskp, field, -subnd)
397
316d315b 398static inline void part_inc_in_flight(struct hd_struct *part, int rw)
ea5c48ab 399{
1e9bb880 400 atomic_inc(&part->in_flight[rw]);
074a7aca 401 if (part->partno)
1e9bb880 402 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
ea5c48ab
JM		 403}
404
316d315b 405static inline void part_dec_in_flight(struct hd_struct *part, int rw)
ea5c48ab 406{
1e9bb880 407 atomic_dec(&part->in_flight[rw]);
074a7aca 408 if (part->partno)
1e9bb880 409 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
316d315b
NK		 410}
411
412static inline int part_in_flight(struct hd_struct *part)
413{
1e9bb880 414 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
ea5c48ab 415}
1da177e4 416
6d1d8050
WD		 417static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
418{
419 if (disk)
420 return kzalloc_node(sizeof(struct partition_meta_info),
421 GFP_KERNEL, disk->node_id);
422 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
423}
424
425static inline void free_part_info(struct hd_struct *part)
426{
427 kfree(part->info);
428}
429
d3992286 430/* block/blk-core.c */
c9959059 431extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4 432
32ca163c 433/* block/genhd.c */
1da177e4
LT		 434extern void add_disk(struct gendisk *disk);
435extern void del_gendisk(struct gendisk *gp);
cf771cb5 436extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 437extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 438
439extern void set_device_ro(struct block_device *bdev, int flag);
440extern void set_disk_ro(struct gendisk *disk, int flag);
441
b7db9956
TH		 442static inline int get_disk_ro(struct gendisk *disk)
443{
444 return disk->part0.policy;
445}
446
77ea887e
TH		 447extern void disk_block_events(struct gendisk *disk);
448extern void disk_unblock_events(struct gendisk *disk);
85ef06d1 449extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
77ea887e
TH		 450extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
451
1da177e4
LT		 452/* drivers/char/random.c */
453extern void add_disk_randomness(struct gendisk *disk);
454extern void rand_initialize_disk(struct gendisk *disk);
455
456static inline sector_t get_start_sect(struct block_device *bdev)
457{
0762b8bd 458 return bdev->bd_part->start_sect;
1da177e4
LT		 459}
460static inline sector_t get_capacity(struct gendisk *disk)
461{
80795aef 462 return disk->part0.nr_sects;
1da177e4
LT		 463}
464static inline void set_capacity(struct gendisk *disk, sector_t size)
465{
80795aef 466 disk->part0.nr_sects = size;
1da177e4
LT		 467}
468
1da177e4
LT		 469#ifdef CONFIG_SOLARIS_X86_PARTITION
470
b84d8796 471#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 472#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
473
474struct solaris_x86_slice {
475 __le16 s_tag; /* ID tag of partition */
476 __le16 s_flag; /* permission flags */
477 __le32 s_start; /* start sector no of partition */
478 __le32 s_size; /* # of blocks in partition */
479};
480
481struct solaris_x86_vtoc {
482 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
483 __le32 v_sanity; /* to verify vtoc sanity */
484 __le32 v_version; /* layout version */
485 char v_volume[8]; /* volume name */
486 __le16 v_sectorsz; /* sector size in bytes */
487 __le16 v_nparts; /* number of partitions */
488 unsigned int v_reserved[10]; /* free space */
489 struct solaris_x86_slice
490 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
491 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
492 char v_asciilabel[128]; /* for compatibility */
493};
494
495#endif /* CONFIG_SOLARIS_X86_PARTITION */
496
497#ifdef CONFIG_BSD_DISKLABEL
498/*
499 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
500 * updated by Marc Espie <Marc.Espie@openbsd.org>
501 */
502
503/* check against BSD src/sys/sys/disklabel.h for consistency */
504
505#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
506#define BSD_MAXPARTITIONS 16
507#define OPENBSD_MAXPARTITIONS 16
508#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
509struct bsd_disklabel {
510 __le32 d_magic; /* the magic number */
511 __s16 d_type; /* drive type */
512 __s16 d_subtype; /* controller/d_type specific */
513 char d_typename[16]; /* type name, e.g. "eagle" */
514 char d_packname[16]; /* pack identifier */
515 __u32 d_secsize; /* # of bytes per sector */
516 __u32 d_nsectors; /* # of data sectors per track */
517 __u32 d_ntracks; /* # of tracks per cylinder */
518 __u32 d_ncylinders; /* # of data cylinders per unit */
519 __u32 d_secpercyl; /* # of data sectors per cylinder */
520 __u32 d_secperunit; /* # of data sectors per unit */
521 __u16 d_sparespertrack; /* # of spare sectors per track */
522 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
523 __u32 d_acylinders; /* # of alt. cylinders per unit */
524 __u16 d_rpm; /* rotational speed */
525 __u16 d_interleave; /* hardware sector interleave */
526 __u16 d_trackskew; /* sector 0 skew, per track */
527 __u16 d_cylskew; /* sector 0 skew, per cylinder */
528 __u32 d_headswitch; /* head switch time, usec */
529 __u32 d_trkseek; /* track-to-track seek, usec */
530 __u32 d_flags; /* generic flags */
531#define NDDATA 5
532 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
533#define NSPARE 5
534 __u32 d_spare[NSPARE]; /* reserved for future use */
535 __le32 d_magic2; /* the magic number (again) */
536 __le16 d_checksum; /* xor of data incl. partitions */
537
538 /* filesystem and partition information: */
539 __le16 d_npartitions; /* number of partitions in following */
540 __le32 d_bbsize; /* size of boot area at sn0, bytes */
541 __le32 d_sbsize; /* max size of fs superblock, bytes */
542 struct bsd_partition { /* the partition table */
543 __le32 p_size; /* number of sectors in partition */
544 __le32 p_offset; /* starting sector */
545 __le32 p_fsize; /* filesystem basic fragment size */
546 __u8 p_fstype; /* filesystem type, see below */
547 __u8 p_frag; /* filesystem fragments per block */
548 __le16 p_cpg; /* filesystem cylinders per group */
549 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
550};
551
552#endif /* CONFIG_BSD_DISKLABEL */
553
554#ifdef CONFIG_UNIXWARE_DISKLABEL
555/*
556 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
557 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
558 */
559
560#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
561#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
562#define UNIXWARE_NUMSLICE 16
563#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
564
565struct unixware_slice {
566 __le16 s_label; /* label */
567 __le16 s_flags; /* permission flags */
568 __le32 start_sect; /* starting sector */
569 __le32 nr_sects; /* number of sectors in slice */
570};
571
572struct unixware_disklabel {
573 __le32 d_type; /* drive type */
574 __le32 d_magic; /* the magic number */
575 __le32 d_version; /* version number */
576 char d_serial[12]; /* serial number of the device */
577 __le32 d_ncylinders; /* # of data cylinders per device */
578 __le32 d_ntracks; /* # of tracks per cylinder */
579 __le32 d_nsectors; /* # of data sectors per track */
580 __le32 d_secsize; /* # of bytes per sector */
581 __le32 d_part_start; /* # of first sector of this partition */
582 __le32 d_unknown1[12]; /* ? */
583 __le32 d_alt_tbl; /* byte offset of alternate table */
584 __le32 d_alt_len; /* byte length of alternate table */
585 __le32 d_phys_cyl; /* # of physical cylinders per device */
586 __le32 d_phys_trk; /* # of physical tracks per cylinder */
587 __le32 d_phys_sec; /* # of physical sectors per track */
588 __le32 d_phys_bytes; /* # of physical bytes per sector */
589 __le32 d_unknown2; /* ? */
590 __le32 d_unknown3; /* ? */
591 __le32 d_pad[8]; /* pad */
592
593 struct unixware_vtoc {
594 __le32 v_magic; /* the magic number */
595 __le32 v_version; /* version number */
596 char v_name[8]; /* volume name */
597 __le16 v_nslices; /* # of slices */
598 __le16 v_unknown1; /* ? */
599 __le32 v_reserved[10]; /* reserved */
600 struct unixware_slice
601 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
602 } vtoc;
603
604}; /* 408 */
605
606#endif /* CONFIG_UNIXWARE_DISKLABEL */
607
608#ifdef CONFIG_MINIX_SUBPARTITION
609# define MINIX_NR_SUBPARTITIONS 4
610#endif /* CONFIG_MINIX_SUBPARTITION */
611
d18d7682
FMDN		 612#define ADDPART_FLAG_NONE 0
613#define ADDPART_FLAG_RAID 1
614#define ADDPART_FLAG_WHOLEDISK 2
615
bcce3de1
TH		 616extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
617extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 618extern dev_t blk_lookup_devt(const char *name, int partno);
619extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4 620
540eed56 621extern int disk_expand_part_tbl(struct gendisk *disk, int target);
1da177e4 622extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
fe316bf2 623extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
ba32929a
TH		 624extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
625 int partno, sector_t start,
6d1d8050
WD		 626 sector_t len, int flags,
627 struct partition_meta_info
628 *info);
6c71013e 629extern void __delete_partition(struct percpu_ref *);
1da177e4 630extern void delete_partition(struct gendisk *, int);
dd2a345f 631extern void printk_all_partitions(void);
1da177e4 632
1946089a 633extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4
LT		 634extern struct gendisk *alloc_disk(int minors);
635extern struct kobject *get_disk(struct gendisk *disk);
636extern void put_disk(struct gendisk *disk);
edfaa7c3 637extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 638 struct module *module,
639 struct kobject *(*probe)(dev_t, int *, void *),
640 int (*lock)(dev_t, void *),
641 void *data);
edfaa7c3 642extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 643
e5610521
TH		 644extern ssize_t part_size_show(struct device *dev,
645 struct device_attribute *attr, char *buf);
074a7aca
TH		 646extern ssize_t part_stat_show(struct device *dev,
647 struct device_attribute *attr, char *buf);
316d315b
NK		 648extern ssize_t part_inflight_show(struct device *dev,
649 struct device_attribute *attr, char *buf);
eddb2e26
TH		 650#ifdef CONFIG_FAIL_MAKE_REQUEST
651extern ssize_t part_fail_show(struct device *dev,
652 struct device_attribute *attr, char *buf);
653extern ssize_t part_fail_store(struct device *dev,
654 struct device_attribute *attr,
655 const char *buf, size_t count);
656#endif /* CONFIG_FAIL_MAKE_REQUEST */
e5610521 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 *);
747extern void blk_integrity_revalidate(struct gendisk *);
748#else /* CONFIG_BLK_DEV_INTEGRITY */
749static inline void blk_integrity_add(struct gendisk *disk) { }
750static inline void blk_integrity_del(struct gendisk *disk) { }
751static inline void blk_integrity_revalidate(struct gendisk *disk) { }
752#endif /* CONFIG_BLK_DEV_INTEGRITY */
753
87c1efbf
JA		 754#else /* CONFIG_BLOCK */
755
756static inline void printk_all_partitions(void) { }
757
cf771cb5 758static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS		 759{
760 dev_t devt = MKDEV(0, 0);
761 return devt;
762}
763
446d64e3
MZ		 764static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
765{
766 return -EINVAL;
767}
87c1efbf 768#endif /* CONFIG_BLOCK */
9361401e 769
a8ae50ba 770#endif /* _LINUX_GENHD_H */
Linux kernel - Deliverables
This page took 0.95881 seconds and 5 git commands to generate.