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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> |
1da177e4 | 19 | |
9361401e DH |
20 | #ifdef CONFIG_BLOCK |
21 | ||
548b10eb | 22 | #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
ed9e1982 | 23 | #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
548b10eb | 24 | #define disk_to_dev(disk) (&(disk)->part0.__dev) |
ed9e1982 | 25 | #define part_to_dev(part) (&((part)->__dev)) |
edfaa7c3 | 26 | |
edfaa7c3 KS |
27 | extern struct device_type part_type; |
28 | extern struct kobject *block_depr; | |
29 | extern struct class block_class; | |
30 | ||
1da177e4 LT |
31 | enum { |
32 | /* These three have identical behaviour; use the second one if DOS FDISK gets | |
33 | confused about extended/logical partitions starting past cylinder 1023. */ | |
34 | DOS_EXTENDED_PARTITION = 5, | |
35 | LINUX_EXTENDED_PARTITION = 0x85, | |
36 | WIN98_EXTENDED_PARTITION = 0x0f, | |
37 | ||
d18d7682 FMDN |
38 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
39 | ||
1da177e4 | 40 | LINUX_SWAP_PARTITION = 0x82, |
4419d1ac OH |
41 | LINUX_DATA_PARTITION = 0x83, |
42 | LINUX_LVM_PARTITION = 0x8e, | |
1da177e4 LT |
43 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
44 | ||
45 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, | |
46 | NEW_SOLARIS_X86_PARTITION = 0xbf, | |
47 | ||
48 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ | |
49 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ | |
50 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ | |
51 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ | |
52 | ||
53 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ | |
54 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ | |
55 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ | |
56 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ | |
57 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ | |
58 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ | |
59 | }; | |
60 | ||
689d6fac | 61 | #define DISK_MAX_PARTS 256 |
3e1a7ff8 | 62 | #define DISK_NAME_LEN 32 |
689d6fac | 63 | |
34186efc DW |
64 | #include <linux/major.h> |
65 | #include <linux/device.h> | |
66 | #include <linux/smp.h> | |
67 | #include <linux/string.h> | |
68 | #include <linux/fs.h> | |
8ce7ad7b | 69 | #include <linux/workqueue.h> |
34186efc | 70 | |
1da177e4 LT |
71 | struct partition { |
72 | unsigned char boot_ind; /* 0x80 - active */ | |
73 | unsigned char head; /* starting head */ | |
74 | unsigned char sector; /* starting sector */ | |
75 | unsigned char cyl; /* starting cylinder */ | |
76 | unsigned char sys_ind; /* What partition type */ | |
77 | unsigned char end_head; /* end head */ | |
78 | unsigned char end_sector; /* end sector */ | |
79 | unsigned char end_cyl; /* end cylinder */ | |
80 | __le32 start_sect; /* starting sector counting from 0 */ | |
81 | __le32 nr_sects; /* nr of sectors in partition */ | |
82 | } __attribute__((packed)); | |
83 | ||
ea5c48ab JM |
84 | struct disk_stats { |
85 | unsigned long sectors[2]; /* READs and WRITEs */ | |
86 | unsigned long ios[2]; | |
87 | unsigned long merges[2]; | |
88 | unsigned long ticks[2]; | |
89 | unsigned long io_ticks; | |
90 | unsigned long time_in_queue; | |
91 | }; | |
6d1d8050 WD |
92 | |
93 | #define PARTITION_META_INFO_VOLNAMELTH 64 | |
1ad7e899 SW |
94 | /* |
95 | * Enough for the string representation of any kind of UUID plus NULL. | |
96 | * EFI UUID is 36 characters. MSDOS UUID is 11 characters. | |
97 | */ | |
63579785 | 98 | #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) |
6d1d8050 WD |
99 | |
100 | struct partition_meta_info { | |
1ad7e899 | 101 | char uuid[PARTITION_META_INFO_UUIDLTH]; |
6d1d8050 WD |
102 | u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
103 | }; | |
104 | ||
1da177e4 LT |
105 | struct hd_struct { |
106 | sector_t start_sect; | |
c83f6bf9 VG |
107 | /* |
108 | * nr_sects is protected by sequence counter. One might extend a | |
109 | * partition while IO is happening to it and update of nr_sects | |
110 | * can be non-atomic on 32bit machines with 64bit sector_t. | |
111 | */ | |
1da177e4 | 112 | sector_t nr_sects; |
c83f6bf9 | 113 | seqcount_t nr_sects_seq; |
c72758f3 | 114 | sector_t alignment_offset; |
a1706ac4 | 115 | unsigned int discard_alignment; |
ed9e1982 | 116 | struct device __dev; |
6a4d44c1 | 117 | struct kobject *holder_dir; |
1da177e4 | 118 | int policy, partno; |
6d1d8050 | 119 | struct partition_meta_info *info; |
c17bb495 AM |
120 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
121 | int make_it_fail; | |
ea5c48ab JM |
122 | #endif |
123 | unsigned long stamp; | |
1e9bb880 | 124 | atomic_t in_flight[2]; |
ea5c48ab | 125 | #ifdef CONFIG_SMP |
43cf38eb | 126 | struct disk_stats __percpu *dkstats; |
ea5c48ab JM |
127 | #else |
128 | struct disk_stats dkstats; | |
c17bb495 | 129 | #endif |
6c71013e | 130 | struct percpu_ref ref; |
e71bf0d0 | 131 | struct rcu_head rcu_head; |
1da177e4 LT |
132 | }; |
133 | ||
134 | #define GENHD_FL_REMOVABLE 1 | |
97fedbbe | 135 | /* 2 is unused */ |
86ce18d7 | 136 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
1da177e4 LT |
137 | #define GENHD_FL_CD 8 |
138 | #define GENHD_FL_UP 16 | |
139 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
689d6fac | 140 | #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
db429e9e | 141 | #define GENHD_FL_NATIVE_CAPACITY 128 |
d4dc210f | 142 | #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
d27769ec | 143 | #define GENHD_FL_NO_PART_SCAN 512 |
1da177e4 | 144 | |
77ea887e TH |
145 | enum { |
146 | DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ | |
147 | DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ | |
148 | }; | |
149 | ||
540eed56 TH |
150 | struct disk_part_tbl { |
151 | struct rcu_head rcu_head; | |
152 | int len; | |
4d2deb40 AB |
153 | struct hd_struct __rcu *last_lookup; |
154 | struct hd_struct __rcu *part[]; | |
540eed56 TH |
155 | }; |
156 | ||
77ea887e | 157 | struct disk_events; |
99e6608c | 158 | struct badblocks; |
77ea887e | 159 | |
25520d55 MP |
160 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
161 | ||
162 | struct blk_integrity { | |
869ab90f EB |
163 | const struct blk_integrity_profile *profile; |
164 | unsigned char flags; | |
165 | unsigned char tuple_size; | |
166 | unsigned char interval_exp; | |
167 | unsigned char tag_size; | |
25520d55 MP |
168 | }; |
169 | ||
170 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
171 | ||
1da177e4 | 172 | struct gendisk { |
689d6fac TH |
173 | /* major, first_minor and minors are input parameters only, |
174 | * don't use directly. Use disk_devt() and disk_max_parts(). | |
f331c029 | 175 | */ |
1da177e4 LT |
176 | int major; /* major number of driver */ |
177 | int first_minor; | |
178 | int minors; /* maximum number of minors, =1 for | |
179 | * disks that can't be partitioned. */ | |
f331c029 | 180 | |
3e1a7ff8 | 181 | char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
2c9ede55 | 182 | char *(*devnode)(struct gendisk *gd, umode_t *mode); |
77ea887e TH |
183 | |
184 | unsigned int events; /* supported events */ | |
185 | unsigned int async_events; /* async events, subset of all */ | |
186 | ||
b5d0b9df | 187 | /* Array of pointers to partitions indexed by partno. |
e71bf0d0 TH |
188 | * Protected with matching bdev lock but stat and other |
189 | * non-critical accesses use RCU. Always access through | |
190 | * helpers. | |
191 | */ | |
4d2deb40 | 192 | struct disk_part_tbl __rcu *part_tbl; |
b5d0b9df | 193 | struct hd_struct part0; |
e71bf0d0 | 194 | |
83d5cde4 | 195 | const struct block_device_operations *fops; |
1da177e4 LT |
196 | struct request_queue *queue; |
197 | void *private_data; | |
1da177e4 LT |
198 | |
199 | int flags; | |
6a4d44c1 | 200 | struct kobject *slave_dir; |
1da177e4 LT |
201 | |
202 | struct timer_rand_state *random; | |
1da177e4 | 203 | atomic_t sync_io; /* RAID */ |
77ea887e | 204 | struct disk_events *ev; |
7ba1ba12 | 205 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
aff34e19 | 206 | struct kobject integrity_kobj; |
25520d55 | 207 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
540eed56 | 208 | int node_id; |
99e6608c | 209 | struct badblocks *bb; |
1da177e4 LT |
210 | }; |
211 | ||
310a2c10 TH |
212 | static inline struct gendisk *part_to_disk(struct hd_struct *part) |
213 | { | |
548b10eb TH |
214 | if (likely(part)) { |
215 | if (part->partno) | |
216 | return dev_to_disk(part_to_dev(part)->parent); | |
217 | else | |
218 | return dev_to_disk(part_to_dev(part)); | |
219 | } | |
310a2c10 TH |
220 | return NULL; |
221 | } | |
222 | ||
f331c029 TH |
223 | static inline int disk_max_parts(struct gendisk *disk) |
224 | { | |
689d6fac TH |
225 | if (disk->flags & GENHD_FL_EXT_DEVT) |
226 | return DISK_MAX_PARTS; | |
227 | return disk->minors; | |
b5d0b9df TH |
228 | } |
229 | ||
d27769ec | 230 | static inline bool disk_part_scan_enabled(struct gendisk *disk) |
b5d0b9df | 231 | { |
d27769ec TH |
232 | return disk_max_parts(disk) > 1 && |
233 | !(disk->flags & GENHD_FL_NO_PART_SCAN); | |
f331c029 TH |
234 | } |
235 | ||
236 | static inline dev_t disk_devt(struct gendisk *disk) | |
237 | { | |
ed9e1982 | 238 | return disk_to_dev(disk)->devt; |
f331c029 TH |
239 | } |
240 | ||
241 | static inline dev_t part_devt(struct hd_struct *part) | |
242 | { | |
ed9e1982 | 243 | return part_to_dev(part)->devt; |
f331c029 TH |
244 | } |
245 | ||
5c21c3dd | 246 | extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
e71bf0d0 TH |
247 | extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
248 | ||
249 | static inline void disk_put_part(struct hd_struct *part) | |
250 | { | |
251 | if (likely(part)) | |
ed9e1982 | 252 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
253 | } |
254 | ||
255 | /* | |
256 | * Smarter partition iterator without context limits. | |
257 | */ | |
258 | #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ | |
259 | #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ | |
b5d0b9df | 260 | #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
71982a40 | 261 | #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
e71bf0d0 TH |
262 | |
263 | struct disk_part_iter { | |
264 | struct gendisk *disk; | |
265 | struct hd_struct *part; | |
266 | int idx; | |
267 | unsigned int flags; | |
268 | }; | |
269 | ||
270 | extern void disk_part_iter_init(struct disk_part_iter *piter, | |
271 | struct gendisk *disk, unsigned int flags); | |
272 | extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); | |
273 | extern void disk_part_iter_exit(struct disk_part_iter *piter); | |
274 | ||
275 | extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, | |
276 | sector_t sector); | |
277 | ||
c9959059 | 278 | /* |
1da177e4 LT |
279 | * Macros to operate on percpu disk statistics: |
280 | * | |
c9959059 TH |
281 | * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
282 | * and should be called between disk_stat_lock() and | |
283 | * disk_stat_unlock(). | |
284 | * | |
285 | * part_stat_read() can be called at any time. | |
286 | * | |
287 | * part_stat_{add|set_all}() and {init|free}_part_stats are for | |
288 | * internal use only. | |
1da177e4 LT |
289 | */ |
290 | #ifdef CONFIG_SMP | |
074a7aca TH |
291 | #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
292 | #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) | |
ea5c48ab | 293 | |
074a7aca TH |
294 | #define __part_stat_add(cpu, part, field, addnd) \ |
295 | (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) | |
ea5c48ab JM |
296 | |
297 | #define part_stat_read(part, field) \ | |
298 | ({ \ | |
074a7aca | 299 | typeof((part)->dkstats->field) res = 0; \ |
7af92f87 SH |
300 | unsigned int _cpu; \ |
301 | for_each_possible_cpu(_cpu) \ | |
302 | res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ | |
ea5c48ab JM |
303 | res; \ |
304 | }) | |
305 | ||
28f13702 JA |
306 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
307 | { | |
ea5c48ab | 308 | int i; |
28f13702 | 309 | |
ea5c48ab JM |
310 | for_each_possible_cpu(i) |
311 | memset(per_cpu_ptr(part->dkstats, i), value, | |
28f13702 | 312 | sizeof(struct disk_stats)); |
ea5c48ab | 313 | } |
c9959059 | 314 | |
074a7aca | 315 | static inline int init_part_stats(struct hd_struct *part) |
ea5c48ab | 316 | { |
074a7aca TH |
317 | part->dkstats = alloc_percpu(struct disk_stats); |
318 | if (!part->dkstats) | |
319 | return 0; | |
320 | return 1; | |
1da177e4 | 321 | } |
ea5c48ab | 322 | |
074a7aca | 323 | static inline void free_part_stats(struct hd_struct *part) |
ea5c48ab | 324 | { |
074a7aca | 325 | free_percpu(part->dkstats); |
ea5c48ab JM |
326 | } |
327 | ||
074a7aca TH |
328 | #else /* !CONFIG_SMP */ |
329 | #define part_stat_lock() ({ rcu_read_lock(); 0; }) | |
330 | #define part_stat_unlock() rcu_read_unlock() | |
c9959059 | 331 | |
074a7aca TH |
332 | #define __part_stat_add(cpu, part, field, addnd) \ |
333 | ((part)->dkstats.field += addnd) | |
1da177e4 | 334 | |
074a7aca | 335 | #define part_stat_read(part, field) ((part)->dkstats.field) |
1da177e4 | 336 | |
074a7aca | 337 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
1da177e4 | 338 | { |
074a7aca | 339 | memset(&part->dkstats, value, sizeof(struct disk_stats)); |
1da177e4 | 340 | } |
ea5c48ab JM |
341 | |
342 | static inline int init_part_stats(struct hd_struct *part) | |
343 | { | |
ea5c48ab JM |
344 | return 1; |
345 | } | |
346 | ||
347 | static inline void free_part_stats(struct hd_struct *part) | |
348 | { | |
ea5c48ab JM |
349 | } |
350 | ||
074a7aca | 351 | #endif /* CONFIG_SMP */ |
1da177e4 | 352 | |
074a7aca TH |
353 | #define part_stat_add(cpu, part, field, addnd) do { \ |
354 | __part_stat_add((cpu), (part), field, addnd); \ | |
355 | if ((part)->partno) \ | |
356 | __part_stat_add((cpu), &part_to_disk((part))->part0, \ | |
357 | field, addnd); \ | |
358 | } while (0) | |
ea5c48ab | 359 | |
074a7aca TH |
360 | #define part_stat_dec(cpu, gendiskp, field) \ |
361 | part_stat_add(cpu, gendiskp, field, -1) | |
362 | #define part_stat_inc(cpu, gendiskp, field) \ | |
363 | part_stat_add(cpu, gendiskp, field, 1) | |
364 | #define part_stat_sub(cpu, gendiskp, field, subnd) \ | |
365 | part_stat_add(cpu, gendiskp, field, -subnd) | |
366 | ||
f299b7c7 | 367 | void part_in_flight(struct request_queue *q, struct hd_struct *part, |
06beec87 OS |
368 | unsigned int inflight[2]); |
369 | void part_in_flight_rw(struct request_queue *q, struct hd_struct *part, | |
370 | unsigned int inflight[2]); | |
f299b7c7 JA |
371 | void part_dec_in_flight(struct request_queue *q, struct hd_struct *part, |
372 | int rw); | |
373 | void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, | |
374 | int rw); | |
1da177e4 | 375 | |
6d1d8050 WD |
376 | static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
377 | { | |
378 | if (disk) | |
379 | return kzalloc_node(sizeof(struct partition_meta_info), | |
380 | GFP_KERNEL, disk->node_id); | |
381 | return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); | |
382 | } | |
383 | ||
384 | static inline void free_part_info(struct hd_struct *part) | |
385 | { | |
386 | kfree(part->info); | |
387 | } | |
388 | ||
d3992286 | 389 | /* block/blk-core.c */ |
d62e26b3 | 390 | extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part); |
1da177e4 | 391 | |
32ca163c | 392 | /* block/genhd.c */ |
e63a46be DW |
393 | extern void device_add_disk(struct device *parent, struct gendisk *disk); |
394 | static inline void add_disk(struct gendisk *disk) | |
395 | { | |
52c44d93 | 396 | device_add_disk(NULL, disk); |
e63a46be DW |
397 | } |
398 | ||
1da177e4 | 399 | extern void del_gendisk(struct gendisk *gp); |
cf771cb5 | 400 | extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
f331c029 | 401 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
1da177e4 LT |
402 | |
403 | extern void set_device_ro(struct block_device *bdev, int flag); | |
404 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
405 | ||
b7db9956 TH |
406 | static inline int get_disk_ro(struct gendisk *disk) |
407 | { | |
408 | return disk->part0.policy; | |
409 | } | |
410 | ||
77ea887e TH |
411 | extern void disk_block_events(struct gendisk *disk); |
412 | extern void disk_unblock_events(struct gendisk *disk); | |
85ef06d1 | 413 | extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
77ea887e TH |
414 | extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
415 | ||
1da177e4 | 416 | /* drivers/char/random.c */ |
0766f788 | 417 | extern void add_disk_randomness(struct gendisk *disk) __latent_entropy; |
1da177e4 LT |
418 | extern void rand_initialize_disk(struct gendisk *disk); |
419 | ||
420 | static inline sector_t get_start_sect(struct block_device *bdev) | |
421 | { | |
0762b8bd | 422 | return bdev->bd_part->start_sect; |
1da177e4 LT |
423 | } |
424 | static inline sector_t get_capacity(struct gendisk *disk) | |
425 | { | |
80795aef | 426 | return disk->part0.nr_sects; |
1da177e4 LT |
427 | } |
428 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
429 | { | |
80795aef | 430 | disk->part0.nr_sects = size; |
1da177e4 LT |
431 | } |
432 | ||
1da177e4 LT |
433 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
434 | ||
b84d8796 | 435 | #define SOLARIS_X86_NUMSLICE 16 |
1da177e4 LT |
436 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
437 | ||
438 | struct solaris_x86_slice { | |
439 | __le16 s_tag; /* ID tag of partition */ | |
440 | __le16 s_flag; /* permission flags */ | |
441 | __le32 s_start; /* start sector no of partition */ | |
442 | __le32 s_size; /* # of blocks in partition */ | |
443 | }; | |
444 | ||
445 | struct solaris_x86_vtoc { | |
446 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
447 | __le32 v_sanity; /* to verify vtoc sanity */ | |
448 | __le32 v_version; /* layout version */ | |
449 | char v_volume[8]; /* volume name */ | |
450 | __le16 v_sectorsz; /* sector size in bytes */ | |
451 | __le16 v_nparts; /* number of partitions */ | |
452 | unsigned int v_reserved[10]; /* free space */ | |
453 | struct solaris_x86_slice | |
454 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
455 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
456 | char v_asciilabel[128]; /* for compatibility */ | |
457 | }; | |
458 | ||
459 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
460 | ||
461 | #ifdef CONFIG_BSD_DISKLABEL | |
462 | /* | |
463 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
464 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
465 | */ | |
466 | ||
467 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
468 | ||
469 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
470 | #define BSD_MAXPARTITIONS 16 | |
471 | #define OPENBSD_MAXPARTITIONS 16 | |
472 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
473 | struct bsd_disklabel { | |
474 | __le32 d_magic; /* the magic number */ | |
475 | __s16 d_type; /* drive type */ | |
476 | __s16 d_subtype; /* controller/d_type specific */ | |
477 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
478 | char d_packname[16]; /* pack identifier */ | |
479 | __u32 d_secsize; /* # of bytes per sector */ | |
480 | __u32 d_nsectors; /* # of data sectors per track */ | |
481 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
482 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
483 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
484 | __u32 d_secperunit; /* # of data sectors per unit */ | |
485 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
486 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
487 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
488 | __u16 d_rpm; /* rotational speed */ | |
489 | __u16 d_interleave; /* hardware sector interleave */ | |
490 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
491 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
492 | __u32 d_headswitch; /* head switch time, usec */ | |
493 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
494 | __u32 d_flags; /* generic flags */ | |
495 | #define NDDATA 5 | |
496 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
497 | #define NSPARE 5 | |
498 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
499 | __le32 d_magic2; /* the magic number (again) */ | |
500 | __le16 d_checksum; /* xor of data incl. partitions */ | |
501 | ||
502 | /* filesystem and partition information: */ | |
503 | __le16 d_npartitions; /* number of partitions in following */ | |
504 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
505 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
506 | struct bsd_partition { /* the partition table */ | |
507 | __le32 p_size; /* number of sectors in partition */ | |
508 | __le32 p_offset; /* starting sector */ | |
509 | __le32 p_fsize; /* filesystem basic fragment size */ | |
510 | __u8 p_fstype; /* filesystem type, see below */ | |
511 | __u8 p_frag; /* filesystem fragments per block */ | |
512 | __le16 p_cpg; /* filesystem cylinders per group */ | |
513 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
514 | }; | |
515 | ||
516 | #endif /* CONFIG_BSD_DISKLABEL */ | |
517 | ||
518 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
519 | /* | |
520 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
521 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
522 | */ | |
523 | ||
524 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
525 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
526 | #define UNIXWARE_NUMSLICE 16 | |
527 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
528 | ||
529 | struct unixware_slice { | |
530 | __le16 s_label; /* label */ | |
531 | __le16 s_flags; /* permission flags */ | |
532 | __le32 start_sect; /* starting sector */ | |
533 | __le32 nr_sects; /* number of sectors in slice */ | |
534 | }; | |
535 | ||
536 | struct unixware_disklabel { | |
537 | __le32 d_type; /* drive type */ | |
538 | __le32 d_magic; /* the magic number */ | |
539 | __le32 d_version; /* version number */ | |
540 | char d_serial[12]; /* serial number of the device */ | |
541 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
542 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
543 | __le32 d_nsectors; /* # of data sectors per track */ | |
544 | __le32 d_secsize; /* # of bytes per sector */ | |
545 | __le32 d_part_start; /* # of first sector of this partition */ | |
546 | __le32 d_unknown1[12]; /* ? */ | |
547 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
548 | __le32 d_alt_len; /* byte length of alternate table */ | |
549 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
550 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
551 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
552 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
553 | __le32 d_unknown2; /* ? */ | |
554 | __le32 d_unknown3; /* ? */ | |
555 | __le32 d_pad[8]; /* pad */ | |
556 | ||
557 | struct unixware_vtoc { | |
558 | __le32 v_magic; /* the magic number */ | |
559 | __le32 v_version; /* version number */ | |
560 | char v_name[8]; /* volume name */ | |
561 | __le16 v_nslices; /* # of slices */ | |
562 | __le16 v_unknown1; /* ? */ | |
563 | __le32 v_reserved[10]; /* reserved */ | |
564 | struct unixware_slice | |
565 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
566 | } vtoc; | |
567 | ||
568 | }; /* 408 */ | |
569 | ||
570 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
571 | ||
572 | #ifdef CONFIG_MINIX_SUBPARTITION | |
573 | # define MINIX_NR_SUBPARTITIONS 4 | |
574 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
575 | ||
d18d7682 FMDN |
576 | #define ADDPART_FLAG_NONE 0 |
577 | #define ADDPART_FLAG_RAID 1 | |
578 | #define ADDPART_FLAG_WHOLEDISK 2 | |
579 | ||
bcce3de1 TH |
580 | extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
581 | extern void blk_free_devt(dev_t devt); | |
cf771cb5 TH |
582 | extern dev_t blk_lookup_devt(const char *name, int partno); |
583 | extern char *disk_name (struct gendisk *hd, int partno, char *buf); | |
1da177e4 | 584 | |
540eed56 | 585 | extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
1da177e4 | 586 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
fe316bf2 | 587 | extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); |
ba32929a TH |
588 | extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
589 | int partno, sector_t start, | |
6d1d8050 WD |
590 | sector_t len, int flags, |
591 | struct partition_meta_info | |
592 | *info); | |
6c71013e | 593 | extern void __delete_partition(struct percpu_ref *); |
1da177e4 | 594 | extern void delete_partition(struct gendisk *, int); |
dd2a345f | 595 | extern void printk_all_partitions(void); |
1da177e4 | 596 | |
1946089a | 597 | extern struct gendisk *alloc_disk_node(int minors, int node_id); |
1da177e4 LT |
598 | extern struct gendisk *alloc_disk(int minors); |
599 | extern struct kobject *get_disk(struct gendisk *disk); | |
600 | extern void put_disk(struct gendisk *disk); | |
edfaa7c3 | 601 | extern void blk_register_region(dev_t devt, unsigned long range, |
1da177e4 LT |
602 | struct module *module, |
603 | struct kobject *(*probe)(dev_t, int *, void *), | |
604 | int (*lock)(dev_t, void *), | |
605 | void *data); | |
edfaa7c3 | 606 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
1da177e4 | 607 | |
e5610521 TH |
608 | extern ssize_t part_size_show(struct device *dev, |
609 | struct device_attribute *attr, char *buf); | |
074a7aca TH |
610 | extern ssize_t part_stat_show(struct device *dev, |
611 | struct device_attribute *attr, char *buf); | |
316d315b NK |
612 | extern ssize_t part_inflight_show(struct device *dev, |
613 | struct device_attribute *attr, char *buf); | |
eddb2e26 TH |
614 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
615 | extern ssize_t part_fail_show(struct device *dev, | |
616 | struct device_attribute *attr, char *buf); | |
617 | extern ssize_t part_fail_store(struct device *dev, | |
618 | struct device_attribute *attr, | |
619 | const char *buf, size_t count); | |
620 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ | |
e5610521 | 621 | |
6c71013e | 622 | static inline int hd_ref_init(struct hd_struct *part) |
6c23a968 | 623 | { |
6c71013e ML |
624 | if (percpu_ref_init(&part->ref, __delete_partition, 0, |
625 | GFP_KERNEL)) | |
626 | return -ENOMEM; | |
627 | return 0; | |
6c23a968 JA |
628 | } |
629 | ||
630 | static inline void hd_struct_get(struct hd_struct *part) | |
631 | { | |
6c71013e | 632 | percpu_ref_get(&part->ref); |
6c23a968 JA |
633 | } |
634 | ||
635 | static inline int hd_struct_try_get(struct hd_struct *part) | |
636 | { | |
6c71013e | 637 | return percpu_ref_tryget_live(&part->ref); |
6c23a968 JA |
638 | } |
639 | ||
640 | static inline void hd_struct_put(struct hd_struct *part) | |
641 | { | |
6c71013e ML |
642 | percpu_ref_put(&part->ref); |
643 | } | |
644 | ||
645 | static inline void hd_struct_kill(struct hd_struct *part) | |
646 | { | |
647 | percpu_ref_kill(&part->ref); | |
6c23a968 JA |
648 | } |
649 | ||
b54e5ed8 ML |
650 | static inline void hd_free_part(struct hd_struct *part) |
651 | { | |
652 | free_part_stats(part); | |
653 | free_part_info(part); | |
6c71013e | 654 | percpu_ref_exit(&part->ref); |
b54e5ed8 ML |
655 | } |
656 | ||
c83f6bf9 VG |
657 | /* |
658 | * Any access of part->nr_sects which is not protected by partition | |
659 | * bd_mutex or gendisk bdev bd_mutex, should be done using this | |
660 | * accessor function. | |
661 | * | |
662 | * Code written along the lines of i_size_read() and i_size_write(). | |
663 | * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption | |
664 | * on. | |
665 | */ | |
666 | static inline sector_t part_nr_sects_read(struct hd_struct *part) | |
667 | { | |
668 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) | |
669 | sector_t nr_sects; | |
670 | unsigned seq; | |
671 | do { | |
672 | seq = read_seqcount_begin(&part->nr_sects_seq); | |
673 | nr_sects = part->nr_sects; | |
674 | } while (read_seqcount_retry(&part->nr_sects_seq, seq)); | |
675 | return nr_sects; | |
676 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) | |
677 | sector_t nr_sects; | |
678 | ||
679 | preempt_disable(); | |
680 | nr_sects = part->nr_sects; | |
681 | preempt_enable(); | |
682 | return nr_sects; | |
683 | #else | |
684 | return part->nr_sects; | |
685 | #endif | |
686 | } | |
687 | ||
688 | /* | |
689 | * Should be called with mutex lock held (typically bd_mutex) of partition | |
690 | * to provide mutual exlusion among writers otherwise seqcount might be | |
691 | * left in wrong state leaving the readers spinning infinitely. | |
692 | */ | |
693 | static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) | |
694 | { | |
695 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) | |
696 | write_seqcount_begin(&part->nr_sects_seq); | |
697 | part->nr_sects = size; | |
698 | write_seqcount_end(&part->nr_sects_seq); | |
699 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) | |
700 | preempt_disable(); | |
701 | part->nr_sects = size; | |
702 | preempt_enable(); | |
703 | #else | |
704 | part->nr_sects = size; | |
705 | #endif | |
706 | } | |
707 | ||
25520d55 MP |
708 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
709 | extern void blk_integrity_add(struct gendisk *); | |
710 | extern void blk_integrity_del(struct gendisk *); | |
25520d55 MP |
711 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
712 | static inline void blk_integrity_add(struct gendisk *disk) { } | |
713 | static inline void blk_integrity_del(struct gendisk *disk) { } | |
25520d55 MP |
714 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
715 | ||
87c1efbf JA |
716 | #else /* CONFIG_BLOCK */ |
717 | ||
718 | static inline void printk_all_partitions(void) { } | |
719 | ||
cf771cb5 | 720 | static inline dev_t blk_lookup_devt(const char *name, int partno) |
edfaa7c3 KS |
721 | { |
722 | dev_t devt = MKDEV(0, 0); | |
723 | return devt; | |
724 | } | |
87c1efbf | 725 | #endif /* CONFIG_BLOCK */ |
9361401e | 726 | |
a8ae50ba | 727 | #endif /* _LINUX_GENHD_H */ |