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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> |
1226b8dd | 20 | #include <asm/local.h> |
1da177e4 | 21 | |
9361401e DH |
22 | #ifdef CONFIG_BLOCK |
23 | ||
548b10eb | 24 | #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
ed9e1982 | 25 | #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
548b10eb | 26 | #define disk_to_dev(disk) (&(disk)->part0.__dev) |
ed9e1982 | 27 | #define part_to_dev(part) (&((part)->__dev)) |
edfaa7c3 | 28 | |
edfaa7c3 KS |
29 | extern struct device_type part_type; |
30 | extern struct kobject *block_depr; | |
31 | extern struct class block_class; | |
32 | ||
1da177e4 LT |
33 | enum { |
34 | /* These three have identical behaviour; use the second one if DOS FDISK gets | |
35 | confused about extended/logical partitions starting past cylinder 1023. */ | |
36 | DOS_EXTENDED_PARTITION = 5, | |
37 | LINUX_EXTENDED_PARTITION = 0x85, | |
38 | WIN98_EXTENDED_PARTITION = 0x0f, | |
39 | ||
d18d7682 FMDN |
40 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
41 | ||
1da177e4 | 42 | LINUX_SWAP_PARTITION = 0x82, |
4419d1ac OH |
43 | LINUX_DATA_PARTITION = 0x83, |
44 | LINUX_LVM_PARTITION = 0x8e, | |
1da177e4 LT |
45 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
46 | ||
47 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, | |
48 | NEW_SOLARIS_X86_PARTITION = 0xbf, | |
49 | ||
50 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ | |
51 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ | |
52 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ | |
53 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ | |
54 | ||
55 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ | |
56 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ | |
57 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ | |
58 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ | |
59 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ | |
60 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ | |
61 | }; | |
62 | ||
689d6fac | 63 | #define DISK_MAX_PARTS 256 |
3e1a7ff8 | 64 | #define DISK_NAME_LEN 32 |
689d6fac | 65 | |
34186efc DW |
66 | #include <linux/major.h> |
67 | #include <linux/device.h> | |
68 | #include <linux/smp.h> | |
69 | #include <linux/string.h> | |
70 | #include <linux/fs.h> | |
8ce7ad7b | 71 | #include <linux/workqueue.h> |
34186efc | 72 | |
1da177e4 LT |
73 | struct partition { |
74 | unsigned char boot_ind; /* 0x80 - active */ | |
75 | unsigned char head; /* starting head */ | |
76 | unsigned char sector; /* starting sector */ | |
77 | unsigned char cyl; /* starting cylinder */ | |
78 | unsigned char sys_ind; /* What partition type */ | |
79 | unsigned char end_head; /* end head */ | |
80 | unsigned char end_sector; /* end sector */ | |
81 | unsigned char end_cyl; /* end cylinder */ | |
82 | __le32 start_sect; /* starting sector counting from 0 */ | |
83 | __le32 nr_sects; /* nr of sectors in partition */ | |
84 | } __attribute__((packed)); | |
85 | ||
ea5c48ab | 86 | struct disk_stats { |
b57e99b4 | 87 | u64 nsecs[NR_STAT_GROUPS]; |
dbae2c55 MC |
88 | unsigned long sectors[NR_STAT_GROUPS]; |
89 | unsigned long ios[NR_STAT_GROUPS]; | |
90 | unsigned long merges[NR_STAT_GROUPS]; | |
ea5c48ab JM |
91 | unsigned long io_ticks; |
92 | unsigned long time_in_queue; | |
1226b8dd | 93 | local_t in_flight[2]; |
ea5c48ab | 94 | }; |
6d1d8050 WD |
95 | |
96 | #define PARTITION_META_INFO_VOLNAMELTH 64 | |
1ad7e899 SW |
97 | /* |
98 | * Enough for the string representation of any kind of UUID plus NULL. | |
99 | * EFI UUID is 36 characters. MSDOS UUID is 11 characters. | |
100 | */ | |
63579785 | 101 | #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) |
6d1d8050 WD |
102 | |
103 | struct partition_meta_info { | |
1ad7e899 | 104 | char uuid[PARTITION_META_INFO_UUIDLTH]; |
6d1d8050 WD |
105 | u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
106 | }; | |
107 | ||
1da177e4 LT |
108 | struct hd_struct { |
109 | sector_t start_sect; | |
c83f6bf9 VG |
110 | /* |
111 | * nr_sects is protected by sequence counter. One might extend a | |
112 | * partition while IO is happening to it and update of nr_sects | |
113 | * can be non-atomic on 32bit machines with 64bit sector_t. | |
114 | */ | |
1da177e4 | 115 | sector_t nr_sects; |
c83f6bf9 | 116 | seqcount_t nr_sects_seq; |
c72758f3 | 117 | sector_t alignment_offset; |
a1706ac4 | 118 | unsigned int discard_alignment; |
ed9e1982 | 119 | struct device __dev; |
6a4d44c1 | 120 | struct kobject *holder_dir; |
1da177e4 | 121 | int policy, partno; |
6d1d8050 | 122 | struct partition_meta_info *info; |
c17bb495 AM |
123 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
124 | int make_it_fail; | |
ea5c48ab JM |
125 | #endif |
126 | unsigned long stamp; | |
ea5c48ab | 127 | #ifdef CONFIG_SMP |
43cf38eb | 128 | struct disk_stats __percpu *dkstats; |
ea5c48ab JM |
129 | #else |
130 | struct disk_stats dkstats; | |
c17bb495 | 131 | #endif |
6c71013e | 132 | struct percpu_ref ref; |
94a2c3a3 | 133 | struct rcu_work rcu_work; |
1da177e4 LT |
134 | }; |
135 | ||
136 | #define GENHD_FL_REMOVABLE 1 | |
97fedbbe | 137 | /* 2 is unused */ |
86ce18d7 | 138 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
1da177e4 LT |
139 | #define GENHD_FL_CD 8 |
140 | #define GENHD_FL_UP 16 | |
141 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
689d6fac | 142 | #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
db429e9e | 143 | #define GENHD_FL_NATIVE_CAPACITY 128 |
d4dc210f | 144 | #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
d27769ec | 145 | #define GENHD_FL_NO_PART_SCAN 512 |
8ddcd653 | 146 | #define GENHD_FL_HIDDEN 1024 |
1da177e4 | 147 | |
77ea887e TH |
148 | enum { |
149 | DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ | |
150 | DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ | |
151 | }; | |
152 | ||
c92e2f04 MW |
153 | enum { |
154 | /* Poll even if events_poll_msecs is unset */ | |
155 | DISK_EVENT_FLAG_POLL = 1 << 0, | |
156 | /* Forward events to udev */ | |
157 | DISK_EVENT_FLAG_UEVENT = 1 << 1, | |
158 | }; | |
159 | ||
540eed56 TH |
160 | struct disk_part_tbl { |
161 | struct rcu_head rcu_head; | |
162 | int len; | |
4d2deb40 AB |
163 | struct hd_struct __rcu *last_lookup; |
164 | struct hd_struct __rcu *part[]; | |
540eed56 TH |
165 | }; |
166 | ||
77ea887e | 167 | struct disk_events; |
99e6608c | 168 | struct badblocks; |
77ea887e | 169 | |
25520d55 MP |
170 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
171 | ||
172 | struct blk_integrity { | |
869ab90f EB |
173 | const struct blk_integrity_profile *profile; |
174 | unsigned char flags; | |
175 | unsigned char tuple_size; | |
176 | unsigned char interval_exp; | |
177 | unsigned char tag_size; | |
25520d55 MP |
178 | }; |
179 | ||
180 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
181 | ||
1da177e4 | 182 | struct gendisk { |
689d6fac TH |
183 | /* major, first_minor and minors are input parameters only, |
184 | * don't use directly. Use disk_devt() and disk_max_parts(). | |
f331c029 | 185 | */ |
1da177e4 LT |
186 | int major; /* major number of driver */ |
187 | int first_minor; | |
188 | int minors; /* maximum number of minors, =1 for | |
189 | * disks that can't be partitioned. */ | |
f331c029 | 190 | |
3e1a7ff8 | 191 | char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
2c9ede55 | 192 | char *(*devnode)(struct gendisk *gd, umode_t *mode); |
77ea887e | 193 | |
c92e2f04 MW |
194 | unsigned short events; /* supported events */ |
195 | unsigned short event_flags; /* flags related to event processing */ | |
77ea887e | 196 | |
b5d0b9df | 197 | /* Array of pointers to partitions indexed by partno. |
e71bf0d0 TH |
198 | * Protected with matching bdev lock but stat and other |
199 | * non-critical accesses use RCU. Always access through | |
200 | * helpers. | |
201 | */ | |
4d2deb40 | 202 | struct disk_part_tbl __rcu *part_tbl; |
b5d0b9df | 203 | struct hd_struct part0; |
e71bf0d0 | 204 | |
83d5cde4 | 205 | const struct block_device_operations *fops; |
1da177e4 LT |
206 | struct request_queue *queue; |
207 | void *private_data; | |
1da177e4 LT |
208 | |
209 | int flags; | |
56c0908c | 210 | struct rw_semaphore lookup_sem; |
6a4d44c1 | 211 | struct kobject *slave_dir; |
1da177e4 LT |
212 | |
213 | struct timer_rand_state *random; | |
1da177e4 | 214 | atomic_t sync_io; /* RAID */ |
77ea887e | 215 | struct disk_events *ev; |
7ba1ba12 | 216 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
aff34e19 | 217 | struct kobject integrity_kobj; |
25520d55 | 218 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
540eed56 | 219 | int node_id; |
99e6608c | 220 | struct badblocks *bb; |
e319e1fb | 221 | struct lockdep_map lockdep_map; |
1da177e4 LT |
222 | }; |
223 | ||
310a2c10 TH |
224 | static inline struct gendisk *part_to_disk(struct hd_struct *part) |
225 | { | |
548b10eb TH |
226 | if (likely(part)) { |
227 | if (part->partno) | |
228 | return dev_to_disk(part_to_dev(part)->parent); | |
229 | else | |
230 | return dev_to_disk(part_to_dev(part)); | |
231 | } | |
310a2c10 TH |
232 | return NULL; |
233 | } | |
234 | ||
f331c029 TH |
235 | static inline int disk_max_parts(struct gendisk *disk) |
236 | { | |
689d6fac TH |
237 | if (disk->flags & GENHD_FL_EXT_DEVT) |
238 | return DISK_MAX_PARTS; | |
239 | return disk->minors; | |
b5d0b9df TH |
240 | } |
241 | ||
d27769ec | 242 | static inline bool disk_part_scan_enabled(struct gendisk *disk) |
b5d0b9df | 243 | { |
d27769ec TH |
244 | return disk_max_parts(disk) > 1 && |
245 | !(disk->flags & GENHD_FL_NO_PART_SCAN); | |
f331c029 TH |
246 | } |
247 | ||
248 | static inline dev_t disk_devt(struct gendisk *disk) | |
249 | { | |
517bf3c3 | 250 | return MKDEV(disk->major, disk->first_minor); |
f331c029 TH |
251 | } |
252 | ||
253 | static inline dev_t part_devt(struct hd_struct *part) | |
254 | { | |
ed9e1982 | 255 | return part_to_dev(part)->devt; |
f331c029 TH |
256 | } |
257 | ||
67f2519f | 258 | extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
e71bf0d0 TH |
259 | extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
260 | ||
261 | static inline void disk_put_part(struct hd_struct *part) | |
262 | { | |
263 | if (likely(part)) | |
ed9e1982 | 264 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
265 | } |
266 | ||
267 | /* | |
268 | * Smarter partition iterator without context limits. | |
269 | */ | |
270 | #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ | |
271 | #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ | |
b5d0b9df | 272 | #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
71982a40 | 273 | #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
e71bf0d0 TH |
274 | |
275 | struct disk_part_iter { | |
276 | struct gendisk *disk; | |
277 | struct hd_struct *part; | |
278 | int idx; | |
279 | unsigned int flags; | |
280 | }; | |
281 | ||
282 | extern void disk_part_iter_init(struct disk_part_iter *piter, | |
283 | struct gendisk *disk, unsigned int flags); | |
284 | extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); | |
285 | extern void disk_part_iter_exit(struct disk_part_iter *piter); | |
286 | ||
287 | extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, | |
288 | sector_t sector); | |
289 | ||
c9959059 | 290 | /* |
1da177e4 LT |
291 | * Macros to operate on percpu disk statistics: |
292 | * | |
c9959059 TH |
293 | * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
294 | * and should be called between disk_stat_lock() and | |
295 | * disk_stat_unlock(). | |
296 | * | |
297 | * part_stat_read() can be called at any time. | |
298 | * | |
299 | * part_stat_{add|set_all}() and {init|free}_part_stats are for | |
300 | * internal use only. | |
1da177e4 LT |
301 | */ |
302 | #ifdef CONFIG_SMP | |
074a7aca TH |
303 | #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
304 | #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) | |
ea5c48ab | 305 | |
1226b8dd MP |
306 | #define part_stat_get_cpu(part, field, cpu) \ |
307 | (per_cpu_ptr((part)->dkstats, (cpu))->field) | |
308 | ||
309 | #define part_stat_get(part, field) \ | |
310 | part_stat_get_cpu(part, field, smp_processor_id()) | |
ea5c48ab JM |
311 | |
312 | #define part_stat_read(part, field) \ | |
313 | ({ \ | |
074a7aca | 314 | typeof((part)->dkstats->field) res = 0; \ |
7af92f87 SH |
315 | unsigned int _cpu; \ |
316 | for_each_possible_cpu(_cpu) \ | |
317 | res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ | |
ea5c48ab JM |
318 | res; \ |
319 | }) | |
320 | ||
28f13702 JA |
321 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
322 | { | |
ea5c48ab | 323 | int i; |
28f13702 | 324 | |
ea5c48ab JM |
325 | for_each_possible_cpu(i) |
326 | memset(per_cpu_ptr(part->dkstats, i), value, | |
28f13702 | 327 | sizeof(struct disk_stats)); |
ea5c48ab | 328 | } |
c9959059 | 329 | |
074a7aca | 330 | static inline int init_part_stats(struct hd_struct *part) |
ea5c48ab | 331 | { |
074a7aca TH |
332 | part->dkstats = alloc_percpu(struct disk_stats); |
333 | if (!part->dkstats) | |
334 | return 0; | |
335 | return 1; | |
1da177e4 | 336 | } |
ea5c48ab | 337 | |
074a7aca | 338 | static inline void free_part_stats(struct hd_struct *part) |
ea5c48ab | 339 | { |
074a7aca | 340 | free_percpu(part->dkstats); |
ea5c48ab JM |
341 | } |
342 | ||
074a7aca TH |
343 | #else /* !CONFIG_SMP */ |
344 | #define part_stat_lock() ({ rcu_read_lock(); 0; }) | |
345 | #define part_stat_unlock() rcu_read_unlock() | |
c9959059 | 346 | |
1226b8dd MP |
347 | #define part_stat_get(part, field) ((part)->dkstats.field) |
348 | #define part_stat_get_cpu(part, field, cpu) part_stat_get(part, field) | |
349 | #define part_stat_read(part, field) part_stat_get(part, field) | |
1da177e4 | 350 | |
074a7aca | 351 | static 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 | |
356 | static inline int init_part_stats(struct hd_struct *part) | |
357 | { | |
ea5c48ab JM |
358 | return 1; |
359 | } | |
360 | ||
361 | static inline void free_part_stats(struct hd_struct *part) | |
362 | { | |
ea5c48ab JM |
363 | } |
364 | ||
074a7aca | 365 | #endif /* CONFIG_SMP */ |
1da177e4 | 366 | |
b57e99b4 OS |
367 | #define part_stat_read_msecs(part, which) \ |
368 | div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC) | |
369 | ||
59767fbd | 370 | #define part_stat_read_accum(part, field) \ |
dbae2c55 | 371 | (part_stat_read(part, field[STAT_READ]) + \ |
bdca3c87 MC |
372 | part_stat_read(part, field[STAT_WRITE]) + \ |
373 | part_stat_read(part, field[STAT_DISCARD])) | |
59767fbd | 374 | |
1226b8dd MP |
375 | #define __part_stat_add(part, field, addnd) \ |
376 | (part_stat_get(part, field) += (addnd)) | |
377 | ||
112f158f MS |
378 | #define part_stat_add(part, field, addnd) do { \ |
379 | __part_stat_add((part), field, addnd); \ | |
074a7aca | 380 | if ((part)->partno) \ |
112f158f | 381 | __part_stat_add(&part_to_disk((part))->part0, \ |
074a7aca TH |
382 | field, addnd); \ |
383 | } while (0) | |
ea5c48ab | 384 | |
112f158f MS |
385 | #define part_stat_dec(gendiskp, field) \ |
386 | part_stat_add(gendiskp, field, -1) | |
387 | #define part_stat_inc(gendiskp, field) \ | |
388 | part_stat_add(gendiskp, field, 1) | |
389 | #define part_stat_sub(gendiskp, field, subnd) \ | |
390 | part_stat_add(gendiskp, field, -subnd) | |
074a7aca | 391 | |
1226b8dd MP |
392 | #define part_stat_local_dec(gendiskp, field) \ |
393 | local_dec(&(part_stat_get(gendiskp, field))) | |
394 | #define part_stat_local_inc(gendiskp, field) \ | |
395 | local_inc(&(part_stat_get(gendiskp, field))) | |
396 | #define part_stat_local_read(gendiskp, field) \ | |
397 | local_read(&(part_stat_get(gendiskp, field))) | |
398 | #define part_stat_local_read_cpu(gendiskp, field, cpu) \ | |
399 | local_read(&(part_stat_get_cpu(gendiskp, field, cpu))) | |
400 | ||
e016b782 | 401 | unsigned int part_in_flight(struct request_queue *q, struct hd_struct *part); |
bf0ddaba OS |
402 | void part_in_flight_rw(struct request_queue *q, struct hd_struct *part, |
403 | unsigned int inflight[2]); | |
f299b7c7 JA |
404 | void part_dec_in_flight(struct request_queue *q, struct hd_struct *part, |
405 | int rw); | |
406 | void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, | |
407 | int rw); | |
1da177e4 | 408 | |
6d1d8050 WD |
409 | static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
410 | { | |
411 | if (disk) | |
412 | return kzalloc_node(sizeof(struct partition_meta_info), | |
413 | GFP_KERNEL, disk->node_id); | |
414 | return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); | |
415 | } | |
416 | ||
417 | static inline void free_part_info(struct hd_struct *part) | |
418 | { | |
419 | kfree(part->info); | |
420 | } | |
421 | ||
5b18b5a7 | 422 | void update_io_ticks(struct hd_struct *part, unsigned long now); |
1da177e4 | 423 | |
32ca163c | 424 | /* block/genhd.c */ |
fef912bf HR |
425 | extern void device_add_disk(struct device *parent, struct gendisk *disk, |
426 | const struct attribute_group **groups); | |
e63a46be DW |
427 | static inline void add_disk(struct gendisk *disk) |
428 | { | |
fef912bf | 429 | device_add_disk(NULL, disk, NULL); |
e63a46be | 430 | } |
fa70d2e2 MS |
431 | extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk); |
432 | static inline void add_disk_no_queue_reg(struct gendisk *disk) | |
433 | { | |
434 | device_add_disk_no_queue_reg(NULL, disk); | |
435 | } | |
e63a46be | 436 | |
1da177e4 | 437 | extern void del_gendisk(struct gendisk *gp); |
cf771cb5 | 438 | extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
f331c029 | 439 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
1da177e4 LT |
440 | |
441 | extern void set_device_ro(struct block_device *bdev, int flag); | |
442 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
443 | ||
b7db9956 TH |
444 | static inline int get_disk_ro(struct gendisk *disk) |
445 | { | |
446 | return disk->part0.policy; | |
447 | } | |
448 | ||
77ea887e TH |
449 | extern void disk_block_events(struct gendisk *disk); |
450 | extern void disk_unblock_events(struct gendisk *disk); | |
85ef06d1 | 451 | extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
77ea887e TH |
452 | extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
453 | ||
1da177e4 | 454 | /* drivers/char/random.c */ |
0766f788 | 455 | extern void add_disk_randomness(struct gendisk *disk) __latent_entropy; |
1da177e4 LT |
456 | extern void rand_initialize_disk(struct gendisk *disk); |
457 | ||
458 | static inline sector_t get_start_sect(struct block_device *bdev) | |
459 | { | |
0762b8bd | 460 | return bdev->bd_part->start_sect; |
1da177e4 LT |
461 | } |
462 | static inline sector_t get_capacity(struct gendisk *disk) | |
463 | { | |
80795aef | 464 | return disk->part0.nr_sects; |
1da177e4 LT |
465 | } |
466 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
467 | { | |
80795aef | 468 | disk->part0.nr_sects = size; |
1da177e4 LT |
469 | } |
470 | ||
1da177e4 LT |
471 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
472 | ||
b84d8796 | 473 | #define SOLARIS_X86_NUMSLICE 16 |
1da177e4 LT |
474 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
475 | ||
476 | struct solaris_x86_slice { | |
477 | __le16 s_tag; /* ID tag of partition */ | |
478 | __le16 s_flag; /* permission flags */ | |
479 | __le32 s_start; /* start sector no of partition */ | |
480 | __le32 s_size; /* # of blocks in partition */ | |
481 | }; | |
482 | ||
483 | struct solaris_x86_vtoc { | |
484 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
485 | __le32 v_sanity; /* to verify vtoc sanity */ | |
486 | __le32 v_version; /* layout version */ | |
487 | char v_volume[8]; /* volume name */ | |
488 | __le16 v_sectorsz; /* sector size in bytes */ | |
489 | __le16 v_nparts; /* number of partitions */ | |
490 | unsigned int v_reserved[10]; /* free space */ | |
491 | struct solaris_x86_slice | |
492 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
493 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
494 | char v_asciilabel[128]; /* for compatibility */ | |
495 | }; | |
496 | ||
497 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
498 | ||
499 | #ifdef CONFIG_BSD_DISKLABEL | |
500 | /* | |
501 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
502 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
503 | */ | |
504 | ||
505 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
506 | ||
507 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
508 | #define BSD_MAXPARTITIONS 16 | |
509 | #define OPENBSD_MAXPARTITIONS 16 | |
510 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
511 | struct bsd_disklabel { | |
512 | __le32 d_magic; /* the magic number */ | |
513 | __s16 d_type; /* drive type */ | |
514 | __s16 d_subtype; /* controller/d_type specific */ | |
515 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
516 | char d_packname[16]; /* pack identifier */ | |
517 | __u32 d_secsize; /* # of bytes per sector */ | |
518 | __u32 d_nsectors; /* # of data sectors per track */ | |
519 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
520 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
521 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
522 | __u32 d_secperunit; /* # of data sectors per unit */ | |
523 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
524 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
525 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
526 | __u16 d_rpm; /* rotational speed */ | |
527 | __u16 d_interleave; /* hardware sector interleave */ | |
528 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
529 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
530 | __u32 d_headswitch; /* head switch time, usec */ | |
531 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
532 | __u32 d_flags; /* generic flags */ | |
533 | #define NDDATA 5 | |
534 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
535 | #define NSPARE 5 | |
536 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
537 | __le32 d_magic2; /* the magic number (again) */ | |
538 | __le16 d_checksum; /* xor of data incl. partitions */ | |
539 | ||
540 | /* filesystem and partition information: */ | |
541 | __le16 d_npartitions; /* number of partitions in following */ | |
542 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
543 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
544 | struct bsd_partition { /* the partition table */ | |
545 | __le32 p_size; /* number of sectors in partition */ | |
546 | __le32 p_offset; /* starting sector */ | |
547 | __le32 p_fsize; /* filesystem basic fragment size */ | |
548 | __u8 p_fstype; /* filesystem type, see below */ | |
549 | __u8 p_frag; /* filesystem fragments per block */ | |
550 | __le16 p_cpg; /* filesystem cylinders per group */ | |
551 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
552 | }; | |
553 | ||
554 | #endif /* CONFIG_BSD_DISKLABEL */ | |
555 | ||
556 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
557 | /* | |
558 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
559 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
560 | */ | |
561 | ||
562 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
563 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
564 | #define UNIXWARE_NUMSLICE 16 | |
565 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
566 | ||
567 | struct unixware_slice { | |
568 | __le16 s_label; /* label */ | |
569 | __le16 s_flags; /* permission flags */ | |
570 | __le32 start_sect; /* starting sector */ | |
571 | __le32 nr_sects; /* number of sectors in slice */ | |
572 | }; | |
573 | ||
574 | struct unixware_disklabel { | |
575 | __le32 d_type; /* drive type */ | |
576 | __le32 d_magic; /* the magic number */ | |
577 | __le32 d_version; /* version number */ | |
578 | char d_serial[12]; /* serial number of the device */ | |
579 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
580 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
581 | __le32 d_nsectors; /* # of data sectors per track */ | |
582 | __le32 d_secsize; /* # of bytes per sector */ | |
583 | __le32 d_part_start; /* # of first sector of this partition */ | |
584 | __le32 d_unknown1[12]; /* ? */ | |
585 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
586 | __le32 d_alt_len; /* byte length of alternate table */ | |
587 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
588 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
589 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
590 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
591 | __le32 d_unknown2; /* ? */ | |
592 | __le32 d_unknown3; /* ? */ | |
593 | __le32 d_pad[8]; /* pad */ | |
594 | ||
595 | struct unixware_vtoc { | |
596 | __le32 v_magic; /* the magic number */ | |
597 | __le32 v_version; /* version number */ | |
598 | char v_name[8]; /* volume name */ | |
599 | __le16 v_nslices; /* # of slices */ | |
600 | __le16 v_unknown1; /* ? */ | |
601 | __le32 v_reserved[10]; /* reserved */ | |
602 | struct unixware_slice | |
603 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
604 | } vtoc; | |
605 | ||
606 | }; /* 408 */ | |
607 | ||
608 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
609 | ||
610 | #ifdef CONFIG_MINIX_SUBPARTITION | |
611 | # define MINIX_NR_SUBPARTITIONS 4 | |
612 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
613 | ||
d18d7682 FMDN |
614 | #define ADDPART_FLAG_NONE 0 |
615 | #define ADDPART_FLAG_RAID 1 | |
616 | #define ADDPART_FLAG_WHOLEDISK 2 | |
617 | ||
bcce3de1 TH |
618 | extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
619 | extern void blk_free_devt(dev_t devt); | |
6fcc44d1 | 620 | extern void blk_invalidate_devt(dev_t devt); |
cf771cb5 TH |
621 | extern dev_t blk_lookup_devt(const char *name, int partno); |
622 | extern char *disk_name (struct gendisk *hd, int partno, char *buf); | |
1da177e4 | 623 | |
540eed56 | 624 | extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
1da177e4 | 625 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
fe316bf2 | 626 | extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); |
ba32929a TH |
627 | extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
628 | int partno, sector_t start, | |
6d1d8050 WD |
629 | sector_t len, int flags, |
630 | struct partition_meta_info | |
631 | *info); | |
6c71013e | 632 | extern void __delete_partition(struct percpu_ref *); |
1da177e4 | 633 | extern void delete_partition(struct gendisk *, int); |
dd2a345f | 634 | extern void printk_all_partitions(void); |
1da177e4 | 635 | |
e319e1fb | 636 | extern struct gendisk *__alloc_disk_node(int minors, int node_id); |
3079c22e | 637 | extern struct kobject *get_disk_and_module(struct gendisk *disk); |
1da177e4 | 638 | extern void put_disk(struct gendisk *disk); |
9df6c299 | 639 | extern void put_disk_and_module(struct gendisk *disk); |
edfaa7c3 | 640 | extern void blk_register_region(dev_t devt, unsigned long range, |
1da177e4 LT |
641 | struct module *module, |
642 | struct kobject *(*probe)(dev_t, int *, void *), | |
643 | int (*lock)(dev_t, void *), | |
644 | void *data); | |
edfaa7c3 | 645 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
1da177e4 | 646 | |
e5610521 TH |
647 | extern ssize_t part_size_show(struct device *dev, |
648 | struct device_attribute *attr, char *buf); | |
074a7aca TH |
649 | extern ssize_t part_stat_show(struct device *dev, |
650 | struct device_attribute *attr, char *buf); | |
316d315b NK |
651 | extern ssize_t part_inflight_show(struct device *dev, |
652 | struct device_attribute *attr, char *buf); | |
eddb2e26 TH |
653 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
654 | extern ssize_t part_fail_show(struct device *dev, | |
655 | struct device_attribute *attr, char *buf); | |
656 | extern ssize_t part_fail_store(struct device *dev, | |
657 | struct device_attribute *attr, | |
658 | const char *buf, size_t count); | |
659 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ | |
e5610521 | 660 | |
e319e1fb BP |
661 | #define alloc_disk_node(minors, node_id) \ |
662 | ({ \ | |
663 | static struct lock_class_key __key; \ | |
664 | const char *__name; \ | |
665 | struct gendisk *__disk; \ | |
666 | \ | |
667 | __name = "(gendisk_completion)"#minors"("#node_id")"; \ | |
668 | \ | |
669 | __disk = __alloc_disk_node(minors, node_id); \ | |
670 | \ | |
671 | if (__disk) \ | |
672 | lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \ | |
673 | \ | |
674 | __disk; \ | |
675 | }) | |
676 | ||
677 | #define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE) | |
678 | ||
6c71013e | 679 | static inline int hd_ref_init(struct hd_struct *part) |
6c23a968 | 680 | { |
6c71013e ML |
681 | if (percpu_ref_init(&part->ref, __delete_partition, 0, |
682 | GFP_KERNEL)) | |
683 | return -ENOMEM; | |
684 | return 0; | |
6c23a968 JA |
685 | } |
686 | ||
687 | static inline void hd_struct_get(struct hd_struct *part) | |
688 | { | |
6c71013e | 689 | percpu_ref_get(&part->ref); |
6c23a968 JA |
690 | } |
691 | ||
692 | static inline int hd_struct_try_get(struct hd_struct *part) | |
693 | { | |
6c71013e | 694 | return percpu_ref_tryget_live(&part->ref); |
6c23a968 JA |
695 | } |
696 | ||
697 | static inline void hd_struct_put(struct hd_struct *part) | |
698 | { | |
6c71013e ML |
699 | percpu_ref_put(&part->ref); |
700 | } | |
701 | ||
702 | static inline void hd_struct_kill(struct hd_struct *part) | |
703 | { | |
704 | percpu_ref_kill(&part->ref); | |
6c23a968 JA |
705 | } |
706 | ||
b54e5ed8 ML |
707 | static inline void hd_free_part(struct hd_struct *part) |
708 | { | |
709 | free_part_stats(part); | |
710 | free_part_info(part); | |
6c71013e | 711 | percpu_ref_exit(&part->ref); |
b54e5ed8 ML |
712 | } |
713 | ||
c83f6bf9 VG |
714 | /* |
715 | * Any access of part->nr_sects which is not protected by partition | |
716 | * bd_mutex or gendisk bdev bd_mutex, should be done using this | |
717 | * accessor function. | |
718 | * | |
719 | * Code written along the lines of i_size_read() and i_size_write(). | |
720 | * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption | |
721 | * on. | |
722 | */ | |
723 | static inline sector_t part_nr_sects_read(struct hd_struct *part) | |
724 | { | |
72deb455 | 725 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
c83f6bf9 VG |
726 | sector_t nr_sects; |
727 | unsigned seq; | |
728 | do { | |
729 | seq = read_seqcount_begin(&part->nr_sects_seq); | |
730 | nr_sects = part->nr_sects; | |
731 | } while (read_seqcount_retry(&part->nr_sects_seq, seq)); | |
732 | return nr_sects; | |
72deb455 | 733 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
c83f6bf9 VG |
734 | sector_t nr_sects; |
735 | ||
736 | preempt_disable(); | |
737 | nr_sects = part->nr_sects; | |
738 | preempt_enable(); | |
739 | return nr_sects; | |
740 | #else | |
741 | return part->nr_sects; | |
742 | #endif | |
743 | } | |
744 | ||
745 | /* | |
746 | * Should be called with mutex lock held (typically bd_mutex) of partition | |
747 | * to provide mutual exlusion among writers otherwise seqcount might be | |
748 | * left in wrong state leaving the readers spinning infinitely. | |
749 | */ | |
750 | static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) | |
751 | { | |
72deb455 | 752 | #if BITS_PER_LONG==32 && defined(CONFIG_SMP) |
c83f6bf9 VG |
753 | write_seqcount_begin(&part->nr_sects_seq); |
754 | part->nr_sects = size; | |
755 | write_seqcount_end(&part->nr_sects_seq); | |
72deb455 | 756 | #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) |
c83f6bf9 VG |
757 | preempt_disable(); |
758 | part->nr_sects = size; | |
759 | preempt_enable(); | |
760 | #else | |
761 | part->nr_sects = size; | |
762 | #endif | |
763 | } | |
764 | ||
25520d55 MP |
765 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
766 | extern void blk_integrity_add(struct gendisk *); | |
767 | extern void blk_integrity_del(struct gendisk *); | |
25520d55 MP |
768 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
769 | static inline void blk_integrity_add(struct gendisk *disk) { } | |
770 | static inline void blk_integrity_del(struct gendisk *disk) { } | |
25520d55 MP |
771 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
772 | ||
87c1efbf JA |
773 | #else /* CONFIG_BLOCK */ |
774 | ||
775 | static inline void printk_all_partitions(void) { } | |
776 | ||
cf771cb5 | 777 | static inline dev_t blk_lookup_devt(const char *name, int partno) |
edfaa7c3 KS |
778 | { |
779 | dev_t devt = MKDEV(0, 0); | |
780 | return devt; | |
781 | } | |
87c1efbf | 782 | #endif /* CONFIG_BLOCK */ |
9361401e | 783 | |
a8ae50ba | 784 | #endif /* _LINUX_GENHD_H */ |