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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> |
1da177e4 | 20 | |
9361401e DH |
21 | #ifdef CONFIG_BLOCK |
22 | ||
548b10eb | 23 | #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
ed9e1982 | 24 | #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
548b10eb | 25 | #define disk_to_dev(disk) (&(disk)->part0.__dev) |
ed9e1982 | 26 | #define part_to_dev(part) (&((part)->__dev)) |
edfaa7c3 | 27 | |
edfaa7c3 KS |
28 | extern struct device_type part_type; |
29 | extern struct kobject *block_depr; | |
30 | extern struct class block_class; | |
31 | ||
1da177e4 LT |
32 | enum { |
33 | /* These three have identical behaviour; use the second one if DOS FDISK gets | |
34 | confused about extended/logical partitions starting past cylinder 1023. */ | |
35 | DOS_EXTENDED_PARTITION = 5, | |
36 | LINUX_EXTENDED_PARTITION = 0x85, | |
37 | WIN98_EXTENDED_PARTITION = 0x0f, | |
38 | ||
d18d7682 FMDN |
39 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
40 | ||
1da177e4 | 41 | LINUX_SWAP_PARTITION = 0x82, |
4419d1ac OH |
42 | LINUX_DATA_PARTITION = 0x83, |
43 | LINUX_LVM_PARTITION = 0x8e, | |
1da177e4 LT |
44 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
45 | ||
46 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, | |
47 | NEW_SOLARIS_X86_PARTITION = 0xbf, | |
48 | ||
49 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ | |
50 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ | |
51 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ | |
52 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ | |
53 | ||
54 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ | |
55 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ | |
56 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ | |
57 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ | |
58 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ | |
59 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ | |
60 | }; | |
61 | ||
689d6fac | 62 | #define DISK_MAX_PARTS 256 |
3e1a7ff8 | 63 | #define DISK_NAME_LEN 32 |
689d6fac | 64 | |
34186efc DW |
65 | #include <linux/major.h> |
66 | #include <linux/device.h> | |
67 | #include <linux/smp.h> | |
68 | #include <linux/string.h> | |
69 | #include <linux/fs.h> | |
8ce7ad7b | 70 | #include <linux/workqueue.h> |
34186efc | 71 | |
1da177e4 LT |
72 | struct partition { |
73 | unsigned char boot_ind; /* 0x80 - active */ | |
74 | unsigned char head; /* starting head */ | |
75 | unsigned char sector; /* starting sector */ | |
76 | unsigned char cyl; /* starting cylinder */ | |
77 | unsigned char sys_ind; /* What partition type */ | |
78 | unsigned char end_head; /* end head */ | |
79 | unsigned char end_sector; /* end sector */ | |
80 | unsigned char end_cyl; /* end cylinder */ | |
81 | __le32 start_sect; /* starting sector counting from 0 */ | |
82 | __le32 nr_sects; /* nr of sectors in partition */ | |
83 | } __attribute__((packed)); | |
84 | ||
ea5c48ab | 85 | struct disk_stats { |
dbae2c55 MC |
86 | unsigned long sectors[NR_STAT_GROUPS]; |
87 | unsigned long ios[NR_STAT_GROUPS]; | |
88 | unsigned long merges[NR_STAT_GROUPS]; | |
89 | unsigned long ticks[NR_STAT_GROUPS]; | |
ea5c48ab JM |
90 | unsigned long io_ticks; |
91 | unsigned long time_in_queue; | |
92 | }; | |
6d1d8050 WD |
93 | |
94 | #define PARTITION_META_INFO_VOLNAMELTH 64 | |
1ad7e899 SW |
95 | /* |
96 | * Enough for the string representation of any kind of UUID plus NULL. | |
97 | * EFI UUID is 36 characters. MSDOS UUID is 11 characters. | |
98 | */ | |
63579785 | 99 | #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) |
6d1d8050 WD |
100 | |
101 | struct partition_meta_info { | |
1ad7e899 | 102 | char uuid[PARTITION_META_INFO_UUIDLTH]; |
6d1d8050 WD |
103 | u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
104 | }; | |
105 | ||
1da177e4 LT |
106 | struct hd_struct { |
107 | sector_t start_sect; | |
c83f6bf9 VG |
108 | /* |
109 | * nr_sects is protected by sequence counter. One might extend a | |
110 | * partition while IO is happening to it and update of nr_sects | |
111 | * can be non-atomic on 32bit machines with 64bit sector_t. | |
112 | */ | |
1da177e4 | 113 | sector_t nr_sects; |
c83f6bf9 | 114 | seqcount_t nr_sects_seq; |
c72758f3 | 115 | sector_t alignment_offset; |
a1706ac4 | 116 | unsigned int discard_alignment; |
ed9e1982 | 117 | struct device __dev; |
6a4d44c1 | 118 | struct kobject *holder_dir; |
1da177e4 | 119 | int policy, partno; |
6d1d8050 | 120 | struct partition_meta_info *info; |
c17bb495 AM |
121 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
122 | int make_it_fail; | |
ea5c48ab JM |
123 | #endif |
124 | unsigned long stamp; | |
1e9bb880 | 125 | atomic_t in_flight[2]; |
ea5c48ab | 126 | #ifdef CONFIG_SMP |
43cf38eb | 127 | struct disk_stats __percpu *dkstats; |
ea5c48ab JM |
128 | #else |
129 | struct disk_stats dkstats; | |
c17bb495 | 130 | #endif |
6c71013e | 131 | struct percpu_ref ref; |
e71bf0d0 | 132 | struct rcu_head rcu_head; |
1da177e4 LT |
133 | }; |
134 | ||
135 | #define GENHD_FL_REMOVABLE 1 | |
97fedbbe | 136 | /* 2 is unused */ |
86ce18d7 | 137 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
1da177e4 LT |
138 | #define GENHD_FL_CD 8 |
139 | #define GENHD_FL_UP 16 | |
140 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
689d6fac | 141 | #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
db429e9e | 142 | #define GENHD_FL_NATIVE_CAPACITY 128 |
d4dc210f | 143 | #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
d27769ec | 144 | #define GENHD_FL_NO_PART_SCAN 512 |
8ddcd653 | 145 | #define GENHD_FL_HIDDEN 1024 |
1da177e4 | 146 | |
77ea887e TH |
147 | enum { |
148 | DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ | |
149 | DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ | |
150 | }; | |
151 | ||
540eed56 TH |
152 | struct disk_part_tbl { |
153 | struct rcu_head rcu_head; | |
154 | int len; | |
4d2deb40 AB |
155 | struct hd_struct __rcu *last_lookup; |
156 | struct hd_struct __rcu *part[]; | |
540eed56 TH |
157 | }; |
158 | ||
77ea887e | 159 | struct disk_events; |
99e6608c | 160 | struct badblocks; |
77ea887e | 161 | |
25520d55 MP |
162 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
163 | ||
164 | struct blk_integrity { | |
869ab90f EB |
165 | const struct blk_integrity_profile *profile; |
166 | unsigned char flags; | |
167 | unsigned char tuple_size; | |
168 | unsigned char interval_exp; | |
169 | unsigned char tag_size; | |
25520d55 MP |
170 | }; |
171 | ||
172 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
173 | ||
1da177e4 | 174 | struct gendisk { |
689d6fac TH |
175 | /* major, first_minor and minors are input parameters only, |
176 | * don't use directly. Use disk_devt() and disk_max_parts(). | |
f331c029 | 177 | */ |
1da177e4 LT |
178 | int major; /* major number of driver */ |
179 | int first_minor; | |
180 | int minors; /* maximum number of minors, =1 for | |
181 | * disks that can't be partitioned. */ | |
f331c029 | 182 | |
3e1a7ff8 | 183 | char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
2c9ede55 | 184 | char *(*devnode)(struct gendisk *gd, umode_t *mode); |
77ea887e TH |
185 | |
186 | unsigned int events; /* supported events */ | |
187 | unsigned int async_events; /* async events, subset of all */ | |
188 | ||
b5d0b9df | 189 | /* Array of pointers to partitions indexed by partno. |
e71bf0d0 TH |
190 | * Protected with matching bdev lock but stat and other |
191 | * non-critical accesses use RCU. Always access through | |
192 | * helpers. | |
193 | */ | |
4d2deb40 | 194 | struct disk_part_tbl __rcu *part_tbl; |
b5d0b9df | 195 | struct hd_struct part0; |
e71bf0d0 | 196 | |
83d5cde4 | 197 | const struct block_device_operations *fops; |
1da177e4 LT |
198 | struct request_queue *queue; |
199 | void *private_data; | |
1da177e4 LT |
200 | |
201 | int flags; | |
56c0908c | 202 | struct rw_semaphore lookup_sem; |
6a4d44c1 | 203 | struct kobject *slave_dir; |
1da177e4 LT |
204 | |
205 | struct timer_rand_state *random; | |
1da177e4 | 206 | atomic_t sync_io; /* RAID */ |
77ea887e | 207 | struct disk_events *ev; |
7ba1ba12 | 208 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
aff34e19 | 209 | struct kobject integrity_kobj; |
25520d55 | 210 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
540eed56 | 211 | int node_id; |
99e6608c | 212 | struct badblocks *bb; |
e319e1fb | 213 | struct lockdep_map lockdep_map; |
1da177e4 LT |
214 | }; |
215 | ||
310a2c10 TH |
216 | static inline struct gendisk *part_to_disk(struct hd_struct *part) |
217 | { | |
548b10eb TH |
218 | if (likely(part)) { |
219 | if (part->partno) | |
220 | return dev_to_disk(part_to_dev(part)->parent); | |
221 | else | |
222 | return dev_to_disk(part_to_dev(part)); | |
223 | } | |
310a2c10 TH |
224 | return NULL; |
225 | } | |
226 | ||
f331c029 TH |
227 | static inline int disk_max_parts(struct gendisk *disk) |
228 | { | |
689d6fac TH |
229 | if (disk->flags & GENHD_FL_EXT_DEVT) |
230 | return DISK_MAX_PARTS; | |
231 | return disk->minors; | |
b5d0b9df TH |
232 | } |
233 | ||
d27769ec | 234 | static inline bool disk_part_scan_enabled(struct gendisk *disk) |
b5d0b9df | 235 | { |
d27769ec TH |
236 | return disk_max_parts(disk) > 1 && |
237 | !(disk->flags & GENHD_FL_NO_PART_SCAN); | |
f331c029 TH |
238 | } |
239 | ||
240 | static inline dev_t disk_devt(struct gendisk *disk) | |
241 | { | |
517bf3c3 | 242 | return MKDEV(disk->major, disk->first_minor); |
f331c029 TH |
243 | } |
244 | ||
245 | static inline dev_t part_devt(struct hd_struct *part) | |
246 | { | |
ed9e1982 | 247 | return part_to_dev(part)->devt; |
f331c029 TH |
248 | } |
249 | ||
67f2519f | 250 | extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
e71bf0d0 TH |
251 | extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
252 | ||
253 | static inline void disk_put_part(struct hd_struct *part) | |
254 | { | |
255 | if (likely(part)) | |
ed9e1982 | 256 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
257 | } |
258 | ||
259 | /* | |
260 | * Smarter partition iterator without context limits. | |
261 | */ | |
262 | #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ | |
263 | #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ | |
b5d0b9df | 264 | #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
71982a40 | 265 | #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
e71bf0d0 TH |
266 | |
267 | struct disk_part_iter { | |
268 | struct gendisk *disk; | |
269 | struct hd_struct *part; | |
270 | int idx; | |
271 | unsigned int flags; | |
272 | }; | |
273 | ||
274 | extern void disk_part_iter_init(struct disk_part_iter *piter, | |
275 | struct gendisk *disk, unsigned int flags); | |
276 | extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); | |
277 | extern void disk_part_iter_exit(struct disk_part_iter *piter); | |
278 | ||
279 | extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, | |
280 | sector_t sector); | |
281 | ||
c9959059 | 282 | /* |
1da177e4 LT |
283 | * Macros to operate on percpu disk statistics: |
284 | * | |
c9959059 TH |
285 | * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
286 | * and should be called between disk_stat_lock() and | |
287 | * disk_stat_unlock(). | |
288 | * | |
289 | * part_stat_read() can be called at any time. | |
290 | * | |
291 | * part_stat_{add|set_all}() and {init|free}_part_stats are for | |
292 | * internal use only. | |
1da177e4 LT |
293 | */ |
294 | #ifdef CONFIG_SMP | |
074a7aca TH |
295 | #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
296 | #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) | |
ea5c48ab | 297 | |
074a7aca TH |
298 | #define __part_stat_add(cpu, part, field, addnd) \ |
299 | (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) | |
ea5c48ab JM |
300 | |
301 | #define part_stat_read(part, field) \ | |
302 | ({ \ | |
074a7aca | 303 | typeof((part)->dkstats->field) res = 0; \ |
7af92f87 SH |
304 | unsigned int _cpu; \ |
305 | for_each_possible_cpu(_cpu) \ | |
306 | res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ | |
ea5c48ab JM |
307 | res; \ |
308 | }) | |
309 | ||
28f13702 JA |
310 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
311 | { | |
ea5c48ab | 312 | int i; |
28f13702 | 313 | |
ea5c48ab JM |
314 | for_each_possible_cpu(i) |
315 | memset(per_cpu_ptr(part->dkstats, i), value, | |
28f13702 | 316 | sizeof(struct disk_stats)); |
ea5c48ab | 317 | } |
c9959059 | 318 | |
074a7aca | 319 | static inline int init_part_stats(struct hd_struct *part) |
ea5c48ab | 320 | { |
074a7aca TH |
321 | part->dkstats = alloc_percpu(struct disk_stats); |
322 | if (!part->dkstats) | |
323 | return 0; | |
324 | return 1; | |
1da177e4 | 325 | } |
ea5c48ab | 326 | |
074a7aca | 327 | static inline void free_part_stats(struct hd_struct *part) |
ea5c48ab | 328 | { |
074a7aca | 329 | free_percpu(part->dkstats); |
ea5c48ab JM |
330 | } |
331 | ||
074a7aca TH |
332 | #else /* !CONFIG_SMP */ |
333 | #define part_stat_lock() ({ rcu_read_lock(); 0; }) | |
334 | #define part_stat_unlock() rcu_read_unlock() | |
c9959059 | 335 | |
074a7aca TH |
336 | #define __part_stat_add(cpu, part, field, addnd) \ |
337 | ((part)->dkstats.field += addnd) | |
1da177e4 | 338 | |
074a7aca | 339 | #define part_stat_read(part, field) ((part)->dkstats.field) |
1da177e4 | 340 | |
074a7aca | 341 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
1da177e4 | 342 | { |
074a7aca | 343 | memset(&part->dkstats, value, sizeof(struct disk_stats)); |
1da177e4 | 344 | } |
ea5c48ab JM |
345 | |
346 | static inline int init_part_stats(struct hd_struct *part) | |
347 | { | |
ea5c48ab JM |
348 | return 1; |
349 | } | |
350 | ||
351 | static inline void free_part_stats(struct hd_struct *part) | |
352 | { | |
ea5c48ab JM |
353 | } |
354 | ||
074a7aca | 355 | #endif /* CONFIG_SMP */ |
1da177e4 | 356 | |
59767fbd | 357 | #define part_stat_read_accum(part, field) \ |
dbae2c55 | 358 | (part_stat_read(part, field[STAT_READ]) + \ |
bdca3c87 MC |
359 | part_stat_read(part, field[STAT_WRITE]) + \ |
360 | part_stat_read(part, field[STAT_DISCARD])) | |
59767fbd | 361 | |
074a7aca TH |
362 | #define part_stat_add(cpu, part, field, addnd) do { \ |
363 | __part_stat_add((cpu), (part), field, addnd); \ | |
364 | if ((part)->partno) \ | |
365 | __part_stat_add((cpu), &part_to_disk((part))->part0, \ | |
366 | field, addnd); \ | |
367 | } while (0) | |
ea5c48ab | 368 | |
074a7aca TH |
369 | #define part_stat_dec(cpu, gendiskp, field) \ |
370 | part_stat_add(cpu, gendiskp, field, -1) | |
371 | #define part_stat_inc(cpu, gendiskp, field) \ | |
372 | part_stat_add(cpu, gendiskp, field, 1) | |
373 | #define part_stat_sub(cpu, gendiskp, field, subnd) \ | |
374 | part_stat_add(cpu, gendiskp, field, -subnd) | |
375 | ||
f299b7c7 | 376 | void part_in_flight(struct request_queue *q, struct hd_struct *part, |
bf0ddaba OS |
377 | unsigned int inflight[2]); |
378 | void part_in_flight_rw(struct request_queue *q, struct hd_struct *part, | |
379 | unsigned int inflight[2]); | |
f299b7c7 JA |
380 | void part_dec_in_flight(struct request_queue *q, struct hd_struct *part, |
381 | int rw); | |
382 | void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, | |
383 | int rw); | |
1da177e4 | 384 | |
6d1d8050 WD |
385 | static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
386 | { | |
387 | if (disk) | |
388 | return kzalloc_node(sizeof(struct partition_meta_info), | |
389 | GFP_KERNEL, disk->node_id); | |
390 | return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); | |
391 | } | |
392 | ||
393 | static inline void free_part_info(struct hd_struct *part) | |
394 | { | |
395 | kfree(part->info); | |
396 | } | |
397 | ||
d3992286 | 398 | /* block/blk-core.c */ |
d62e26b3 | 399 | extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part); |
1da177e4 | 400 | |
32ca163c | 401 | /* block/genhd.c */ |
e63a46be DW |
402 | extern void device_add_disk(struct device *parent, struct gendisk *disk); |
403 | static inline void add_disk(struct gendisk *disk) | |
404 | { | |
52c44d93 | 405 | device_add_disk(NULL, disk); |
e63a46be | 406 | } |
fa70d2e2 MS |
407 | extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk); |
408 | static inline void add_disk_no_queue_reg(struct gendisk *disk) | |
409 | { | |
410 | device_add_disk_no_queue_reg(NULL, disk); | |
411 | } | |
e63a46be | 412 | |
1da177e4 | 413 | extern void del_gendisk(struct gendisk *gp); |
cf771cb5 | 414 | extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
f331c029 | 415 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
1da177e4 LT |
416 | |
417 | extern void set_device_ro(struct block_device *bdev, int flag); | |
418 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
419 | ||
b7db9956 TH |
420 | static inline int get_disk_ro(struct gendisk *disk) |
421 | { | |
422 | return disk->part0.policy; | |
423 | } | |
424 | ||
77ea887e TH |
425 | extern void disk_block_events(struct gendisk *disk); |
426 | extern void disk_unblock_events(struct gendisk *disk); | |
85ef06d1 | 427 | extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
77ea887e TH |
428 | extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
429 | ||
1da177e4 | 430 | /* drivers/char/random.c */ |
0766f788 | 431 | extern void add_disk_randomness(struct gendisk *disk) __latent_entropy; |
1da177e4 LT |
432 | extern void rand_initialize_disk(struct gendisk *disk); |
433 | ||
434 | static inline sector_t get_start_sect(struct block_device *bdev) | |
435 | { | |
0762b8bd | 436 | return bdev->bd_part->start_sect; |
1da177e4 LT |
437 | } |
438 | static inline sector_t get_capacity(struct gendisk *disk) | |
439 | { | |
80795aef | 440 | return disk->part0.nr_sects; |
1da177e4 LT |
441 | } |
442 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
443 | { | |
80795aef | 444 | disk->part0.nr_sects = size; |
1da177e4 LT |
445 | } |
446 | ||
1da177e4 LT |
447 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
448 | ||
b84d8796 | 449 | #define SOLARIS_X86_NUMSLICE 16 |
1da177e4 LT |
450 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
451 | ||
452 | struct solaris_x86_slice { | |
453 | __le16 s_tag; /* ID tag of partition */ | |
454 | __le16 s_flag; /* permission flags */ | |
455 | __le32 s_start; /* start sector no of partition */ | |
456 | __le32 s_size; /* # of blocks in partition */ | |
457 | }; | |
458 | ||
459 | struct solaris_x86_vtoc { | |
460 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
461 | __le32 v_sanity; /* to verify vtoc sanity */ | |
462 | __le32 v_version; /* layout version */ | |
463 | char v_volume[8]; /* volume name */ | |
464 | __le16 v_sectorsz; /* sector size in bytes */ | |
465 | __le16 v_nparts; /* number of partitions */ | |
466 | unsigned int v_reserved[10]; /* free space */ | |
467 | struct solaris_x86_slice | |
468 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
469 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
470 | char v_asciilabel[128]; /* for compatibility */ | |
471 | }; | |
472 | ||
473 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
474 | ||
475 | #ifdef CONFIG_BSD_DISKLABEL | |
476 | /* | |
477 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
478 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
479 | */ | |
480 | ||
481 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
482 | ||
483 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
484 | #define BSD_MAXPARTITIONS 16 | |
485 | #define OPENBSD_MAXPARTITIONS 16 | |
486 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
487 | struct bsd_disklabel { | |
488 | __le32 d_magic; /* the magic number */ | |
489 | __s16 d_type; /* drive type */ | |
490 | __s16 d_subtype; /* controller/d_type specific */ | |
491 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
492 | char d_packname[16]; /* pack identifier */ | |
493 | __u32 d_secsize; /* # of bytes per sector */ | |
494 | __u32 d_nsectors; /* # of data sectors per track */ | |
495 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
496 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
497 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
498 | __u32 d_secperunit; /* # of data sectors per unit */ | |
499 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
500 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
501 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
502 | __u16 d_rpm; /* rotational speed */ | |
503 | __u16 d_interleave; /* hardware sector interleave */ | |
504 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
505 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
506 | __u32 d_headswitch; /* head switch time, usec */ | |
507 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
508 | __u32 d_flags; /* generic flags */ | |
509 | #define NDDATA 5 | |
510 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
511 | #define NSPARE 5 | |
512 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
513 | __le32 d_magic2; /* the magic number (again) */ | |
514 | __le16 d_checksum; /* xor of data incl. partitions */ | |
515 | ||
516 | /* filesystem and partition information: */ | |
517 | __le16 d_npartitions; /* number of partitions in following */ | |
518 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
519 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
520 | struct bsd_partition { /* the partition table */ | |
521 | __le32 p_size; /* number of sectors in partition */ | |
522 | __le32 p_offset; /* starting sector */ | |
523 | __le32 p_fsize; /* filesystem basic fragment size */ | |
524 | __u8 p_fstype; /* filesystem type, see below */ | |
525 | __u8 p_frag; /* filesystem fragments per block */ | |
526 | __le16 p_cpg; /* filesystem cylinders per group */ | |
527 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
528 | }; | |
529 | ||
530 | #endif /* CONFIG_BSD_DISKLABEL */ | |
531 | ||
532 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
533 | /* | |
534 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
535 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
536 | */ | |
537 | ||
538 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
539 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
540 | #define UNIXWARE_NUMSLICE 16 | |
541 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
542 | ||
543 | struct unixware_slice { | |
544 | __le16 s_label; /* label */ | |
545 | __le16 s_flags; /* permission flags */ | |
546 | __le32 start_sect; /* starting sector */ | |
547 | __le32 nr_sects; /* number of sectors in slice */ | |
548 | }; | |
549 | ||
550 | struct unixware_disklabel { | |
551 | __le32 d_type; /* drive type */ | |
552 | __le32 d_magic; /* the magic number */ | |
553 | __le32 d_version; /* version number */ | |
554 | char d_serial[12]; /* serial number of the device */ | |
555 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
556 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
557 | __le32 d_nsectors; /* # of data sectors per track */ | |
558 | __le32 d_secsize; /* # of bytes per sector */ | |
559 | __le32 d_part_start; /* # of first sector of this partition */ | |
560 | __le32 d_unknown1[12]; /* ? */ | |
561 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
562 | __le32 d_alt_len; /* byte length of alternate table */ | |
563 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
564 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
565 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
566 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
567 | __le32 d_unknown2; /* ? */ | |
568 | __le32 d_unknown3; /* ? */ | |
569 | __le32 d_pad[8]; /* pad */ | |
570 | ||
571 | struct unixware_vtoc { | |
572 | __le32 v_magic; /* the magic number */ | |
573 | __le32 v_version; /* version number */ | |
574 | char v_name[8]; /* volume name */ | |
575 | __le16 v_nslices; /* # of slices */ | |
576 | __le16 v_unknown1; /* ? */ | |
577 | __le32 v_reserved[10]; /* reserved */ | |
578 | struct unixware_slice | |
579 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
580 | } vtoc; | |
581 | ||
582 | }; /* 408 */ | |
583 | ||
584 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
585 | ||
586 | #ifdef CONFIG_MINIX_SUBPARTITION | |
587 | # define MINIX_NR_SUBPARTITIONS 4 | |
588 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
589 | ||
d18d7682 FMDN |
590 | #define ADDPART_FLAG_NONE 0 |
591 | #define ADDPART_FLAG_RAID 1 | |
592 | #define ADDPART_FLAG_WHOLEDISK 2 | |
593 | ||
bcce3de1 TH |
594 | extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
595 | extern void blk_free_devt(dev_t devt); | |
cf771cb5 TH |
596 | extern dev_t blk_lookup_devt(const char *name, int partno); |
597 | extern char *disk_name (struct gendisk *hd, int partno, char *buf); | |
1da177e4 | 598 | |
540eed56 | 599 | extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
1da177e4 | 600 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
fe316bf2 | 601 | extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); |
ba32929a TH |
602 | extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
603 | int partno, sector_t start, | |
6d1d8050 WD |
604 | sector_t len, int flags, |
605 | struct partition_meta_info | |
606 | *info); | |
6c71013e | 607 | extern void __delete_partition(struct percpu_ref *); |
1da177e4 | 608 | extern void delete_partition(struct gendisk *, int); |
dd2a345f | 609 | extern void printk_all_partitions(void); |
1da177e4 | 610 | |
e319e1fb | 611 | extern struct gendisk *__alloc_disk_node(int minors, int node_id); |
3079c22e | 612 | extern struct kobject *get_disk_and_module(struct gendisk *disk); |
1da177e4 | 613 | extern void put_disk(struct gendisk *disk); |
9df6c299 | 614 | extern void put_disk_and_module(struct gendisk *disk); |
edfaa7c3 | 615 | extern void blk_register_region(dev_t devt, unsigned long range, |
1da177e4 LT |
616 | struct module *module, |
617 | struct kobject *(*probe)(dev_t, int *, void *), | |
618 | int (*lock)(dev_t, void *), | |
619 | void *data); | |
edfaa7c3 | 620 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
1da177e4 | 621 | |
e5610521 TH |
622 | extern ssize_t part_size_show(struct device *dev, |
623 | struct device_attribute *attr, char *buf); | |
074a7aca TH |
624 | extern ssize_t part_stat_show(struct device *dev, |
625 | struct device_attribute *attr, char *buf); | |
316d315b NK |
626 | extern ssize_t part_inflight_show(struct device *dev, |
627 | struct device_attribute *attr, char *buf); | |
eddb2e26 TH |
628 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
629 | extern ssize_t part_fail_show(struct device *dev, | |
630 | struct device_attribute *attr, char *buf); | |
631 | extern ssize_t part_fail_store(struct device *dev, | |
632 | struct device_attribute *attr, | |
633 | const char *buf, size_t count); | |
634 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ | |
e5610521 | 635 | |
e319e1fb BP |
636 | #define alloc_disk_node(minors, node_id) \ |
637 | ({ \ | |
638 | static struct lock_class_key __key; \ | |
639 | const char *__name; \ | |
640 | struct gendisk *__disk; \ | |
641 | \ | |
642 | __name = "(gendisk_completion)"#minors"("#node_id")"; \ | |
643 | \ | |
644 | __disk = __alloc_disk_node(minors, node_id); \ | |
645 | \ | |
646 | if (__disk) \ | |
647 | lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \ | |
648 | \ | |
649 | __disk; \ | |
650 | }) | |
651 | ||
652 | #define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE) | |
653 | ||
6c71013e | 654 | static inline int hd_ref_init(struct hd_struct *part) |
6c23a968 | 655 | { |
6c71013e ML |
656 | if (percpu_ref_init(&part->ref, __delete_partition, 0, |
657 | GFP_KERNEL)) | |
658 | return -ENOMEM; | |
659 | return 0; | |
6c23a968 JA |
660 | } |
661 | ||
662 | static inline void hd_struct_get(struct hd_struct *part) | |
663 | { | |
6c71013e | 664 | percpu_ref_get(&part->ref); |
6c23a968 JA |
665 | } |
666 | ||
667 | static inline int hd_struct_try_get(struct hd_struct *part) | |
668 | { | |
6c71013e | 669 | return percpu_ref_tryget_live(&part->ref); |
6c23a968 JA |
670 | } |
671 | ||
672 | static inline void hd_struct_put(struct hd_struct *part) | |
673 | { | |
6c71013e ML |
674 | percpu_ref_put(&part->ref); |
675 | } | |
676 | ||
677 | static inline void hd_struct_kill(struct hd_struct *part) | |
678 | { | |
679 | percpu_ref_kill(&part->ref); | |
6c23a968 JA |
680 | } |
681 | ||
b54e5ed8 ML |
682 | static inline void hd_free_part(struct hd_struct *part) |
683 | { | |
684 | free_part_stats(part); | |
685 | free_part_info(part); | |
6c71013e | 686 | percpu_ref_exit(&part->ref); |
b54e5ed8 ML |
687 | } |
688 | ||
c83f6bf9 VG |
689 | /* |
690 | * Any access of part->nr_sects which is not protected by partition | |
691 | * bd_mutex or gendisk bdev bd_mutex, should be done using this | |
692 | * accessor function. | |
693 | * | |
694 | * Code written along the lines of i_size_read() and i_size_write(). | |
695 | * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption | |
696 | * on. | |
697 | */ | |
698 | static inline sector_t part_nr_sects_read(struct hd_struct *part) | |
699 | { | |
700 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) | |
701 | sector_t nr_sects; | |
702 | unsigned seq; | |
703 | do { | |
704 | seq = read_seqcount_begin(&part->nr_sects_seq); | |
705 | nr_sects = part->nr_sects; | |
706 | } while (read_seqcount_retry(&part->nr_sects_seq, seq)); | |
707 | return nr_sects; | |
708 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) | |
709 | sector_t nr_sects; | |
710 | ||
711 | preempt_disable(); | |
712 | nr_sects = part->nr_sects; | |
713 | preempt_enable(); | |
714 | return nr_sects; | |
715 | #else | |
716 | return part->nr_sects; | |
717 | #endif | |
718 | } | |
719 | ||
720 | /* | |
721 | * Should be called with mutex lock held (typically bd_mutex) of partition | |
722 | * to provide mutual exlusion among writers otherwise seqcount might be | |
723 | * left in wrong state leaving the readers spinning infinitely. | |
724 | */ | |
725 | static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) | |
726 | { | |
727 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) | |
728 | write_seqcount_begin(&part->nr_sects_seq); | |
729 | part->nr_sects = size; | |
730 | write_seqcount_end(&part->nr_sects_seq); | |
731 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) | |
732 | preempt_disable(); | |
733 | part->nr_sects = size; | |
734 | preempt_enable(); | |
735 | #else | |
736 | part->nr_sects = size; | |
737 | #endif | |
738 | } | |
739 | ||
25520d55 MP |
740 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
741 | extern void blk_integrity_add(struct gendisk *); | |
742 | extern void blk_integrity_del(struct gendisk *); | |
25520d55 MP |
743 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
744 | static inline void blk_integrity_add(struct gendisk *disk) { } | |
745 | static inline void blk_integrity_del(struct gendisk *disk) { } | |
25520d55 MP |
746 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
747 | ||
87c1efbf JA |
748 | #else /* CONFIG_BLOCK */ |
749 | ||
750 | static inline void printk_all_partitions(void) { } | |
751 | ||
cf771cb5 | 752 | static inline dev_t blk_lookup_devt(const char *name, int partno) |
edfaa7c3 KS |
753 | { |
754 | dev_t devt = MKDEV(0, 0); | |
755 | return devt; | |
756 | } | |
87c1efbf | 757 | #endif /* CONFIG_BLOCK */ |
9361401e | 758 | |
a8ae50ba | 759 | #endif /* _LINUX_GENHD_H */ |