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1da177e4 LT |
1 | #ifndef _LINUX_GENHD_H |
2 | #define _LINUX_GENHD_H | |
3 | ||
4 | /* | |
5 | * genhd.h Copyright (C) 1992 Drew Eckhardt | |
6 | * Generic hard disk header file by | |
7 | * Drew Eckhardt | |
8 | * | |
9 | * <drew@colorado.edu> | |
10 | */ | |
11 | ||
1da177e4 | 12 | #include <linux/types.h> |
edfaa7c3 | 13 | #include <linux/kdev_t.h> |
e71bf0d0 | 14 | #include <linux/rcupdate.h> |
6d1d8050 | 15 | #include <linux/slab.h> |
6c71013e | 16 | #include <linux/percpu-refcount.h> |
63579785 | 17 | #include <linux/uuid.h> |
1da177e4 | 18 | |
9361401e DH |
19 | #ifdef CONFIG_BLOCK |
20 | ||
548b10eb | 21 | #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
ed9e1982 | 22 | #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
548b10eb | 23 | #define disk_to_dev(disk) (&(disk)->part0.__dev) |
ed9e1982 | 24 | #define part_to_dev(part) (&((part)->__dev)) |
edfaa7c3 | 25 | |
edfaa7c3 KS |
26 | extern struct device_type part_type; |
27 | extern struct kobject *block_depr; | |
28 | extern struct class block_class; | |
29 | ||
1da177e4 LT |
30 | enum { |
31 | /* These three have identical behaviour; use the second one if DOS FDISK gets | |
32 | confused about extended/logical partitions starting past cylinder 1023. */ | |
33 | DOS_EXTENDED_PARTITION = 5, | |
34 | LINUX_EXTENDED_PARTITION = 0x85, | |
35 | WIN98_EXTENDED_PARTITION = 0x0f, | |
36 | ||
d18d7682 FMDN |
37 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
38 | ||
1da177e4 | 39 | LINUX_SWAP_PARTITION = 0x82, |
4419d1ac OH |
40 | LINUX_DATA_PARTITION = 0x83, |
41 | LINUX_LVM_PARTITION = 0x8e, | |
1da177e4 LT |
42 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
43 | ||
44 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, | |
45 | NEW_SOLARIS_X86_PARTITION = 0xbf, | |
46 | ||
47 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ | |
48 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ | |
49 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ | |
50 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ | |
51 | ||
52 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ | |
53 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ | |
54 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ | |
55 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ | |
56 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ | |
57 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ | |
58 | }; | |
59 | ||
689d6fac | 60 | #define DISK_MAX_PARTS 256 |
3e1a7ff8 | 61 | #define DISK_NAME_LEN 32 |
689d6fac | 62 | |
34186efc DW |
63 | #include <linux/major.h> |
64 | #include <linux/device.h> | |
65 | #include <linux/smp.h> | |
66 | #include <linux/string.h> | |
67 | #include <linux/fs.h> | |
8ce7ad7b | 68 | #include <linux/workqueue.h> |
34186efc | 69 | |
1da177e4 LT |
70 | struct partition { |
71 | unsigned char boot_ind; /* 0x80 - active */ | |
72 | unsigned char head; /* starting head */ | |
73 | unsigned char sector; /* starting sector */ | |
74 | unsigned char cyl; /* starting cylinder */ | |
75 | unsigned char sys_ind; /* What partition type */ | |
76 | unsigned char end_head; /* end head */ | |
77 | unsigned char end_sector; /* end sector */ | |
78 | unsigned char end_cyl; /* end cylinder */ | |
79 | __le32 start_sect; /* starting sector counting from 0 */ | |
80 | __le32 nr_sects; /* nr of sectors in partition */ | |
81 | } __attribute__((packed)); | |
82 | ||
ea5c48ab JM |
83 | struct disk_stats { |
84 | unsigned long sectors[2]; /* READs and WRITEs */ | |
85 | unsigned long ios[2]; | |
86 | unsigned long merges[2]; | |
87 | unsigned long ticks[2]; | |
88 | unsigned long io_ticks; | |
89 | unsigned long time_in_queue; | |
90 | }; | |
6d1d8050 WD |
91 | |
92 | #define PARTITION_META_INFO_VOLNAMELTH 64 | |
1ad7e899 SW |
93 | /* |
94 | * Enough for the string representation of any kind of UUID plus NULL. | |
95 | * EFI UUID is 36 characters. MSDOS UUID is 11 characters. | |
96 | */ | |
63579785 | 97 | #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) |
6d1d8050 WD |
98 | |
99 | struct partition_meta_info { | |
1ad7e899 | 100 | char uuid[PARTITION_META_INFO_UUIDLTH]; |
6d1d8050 WD |
101 | u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
102 | }; | |
103 | ||
1da177e4 LT |
104 | struct hd_struct { |
105 | sector_t start_sect; | |
c83f6bf9 VG |
106 | /* |
107 | * nr_sects is protected by sequence counter. One might extend a | |
108 | * partition while IO is happening to it and update of nr_sects | |
109 | * can be non-atomic on 32bit machines with 64bit sector_t. | |
110 | */ | |
1da177e4 | 111 | sector_t nr_sects; |
c83f6bf9 | 112 | seqcount_t nr_sects_seq; |
c72758f3 | 113 | sector_t alignment_offset; |
a1706ac4 | 114 | unsigned int discard_alignment; |
ed9e1982 | 115 | struct device __dev; |
6a4d44c1 | 116 | struct kobject *holder_dir; |
1da177e4 | 117 | int policy, partno; |
6d1d8050 | 118 | struct partition_meta_info *info; |
c17bb495 AM |
119 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
120 | int make_it_fail; | |
ea5c48ab JM |
121 | #endif |
122 | unsigned long stamp; | |
1e9bb880 | 123 | atomic_t in_flight[2]; |
ea5c48ab | 124 | #ifdef CONFIG_SMP |
43cf38eb | 125 | struct disk_stats __percpu *dkstats; |
ea5c48ab JM |
126 | #else |
127 | struct disk_stats dkstats; | |
c17bb495 | 128 | #endif |
6c71013e | 129 | struct percpu_ref ref; |
e71bf0d0 | 130 | struct rcu_head rcu_head; |
1da177e4 LT |
131 | }; |
132 | ||
133 | #define GENHD_FL_REMOVABLE 1 | |
97fedbbe | 134 | /* 2 is unused */ |
86ce18d7 | 135 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
1da177e4 LT |
136 | #define GENHD_FL_CD 8 |
137 | #define GENHD_FL_UP 16 | |
138 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
689d6fac | 139 | #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
db429e9e | 140 | #define GENHD_FL_NATIVE_CAPACITY 128 |
d4dc210f | 141 | #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
d27769ec | 142 | #define GENHD_FL_NO_PART_SCAN 512 |
1da177e4 | 143 | |
77ea887e TH |
144 | enum { |
145 | DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ | |
146 | DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ | |
147 | }; | |
148 | ||
540eed56 TH |
149 | #define BLK_SCSI_MAX_CMDS (256) |
150 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
151 | ||
152 | struct blk_scsi_cmd_filter { | |
153 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; | |
154 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
155 | struct kobject kobj; | |
156 | }; | |
157 | ||
158 | struct disk_part_tbl { | |
159 | struct rcu_head rcu_head; | |
160 | int len; | |
4d2deb40 AB |
161 | struct hd_struct __rcu *last_lookup; |
162 | struct hd_struct __rcu *part[]; | |
540eed56 TH |
163 | }; |
164 | ||
77ea887e | 165 | struct disk_events; |
99e6608c | 166 | struct badblocks; |
77ea887e | 167 | |
25520d55 MP |
168 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
169 | ||
170 | struct blk_integrity { | |
171 | struct blk_integrity_profile *profile; | |
172 | unsigned char flags; | |
173 | unsigned char tuple_size; | |
174 | unsigned char interval_exp; | |
175 | unsigned char tag_size; | |
176 | }; | |
177 | ||
178 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
179 | ||
1da177e4 | 180 | struct gendisk { |
689d6fac TH |
181 | /* major, first_minor and minors are input parameters only, |
182 | * don't use directly. Use disk_devt() and disk_max_parts(). | |
f331c029 | 183 | */ |
1da177e4 LT |
184 | int major; /* major number of driver */ |
185 | int first_minor; | |
186 | int minors; /* maximum number of minors, =1 for | |
187 | * disks that can't be partitioned. */ | |
f331c029 | 188 | |
3e1a7ff8 | 189 | char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
2c9ede55 | 190 | char *(*devnode)(struct gendisk *gd, umode_t *mode); |
77ea887e TH |
191 | |
192 | unsigned int events; /* supported events */ | |
193 | unsigned int async_events; /* async events, subset of all */ | |
194 | ||
b5d0b9df | 195 | /* Array of pointers to partitions indexed by partno. |
e71bf0d0 TH |
196 | * Protected with matching bdev lock but stat and other |
197 | * non-critical accesses use RCU. Always access through | |
198 | * helpers. | |
199 | */ | |
4d2deb40 | 200 | struct disk_part_tbl __rcu *part_tbl; |
b5d0b9df | 201 | struct hd_struct part0; |
e71bf0d0 | 202 | |
83d5cde4 | 203 | const struct block_device_operations *fops; |
1da177e4 LT |
204 | struct request_queue *queue; |
205 | void *private_data; | |
1da177e4 LT |
206 | |
207 | int flags; | |
6a4d44c1 | 208 | struct kobject *slave_dir; |
1da177e4 LT |
209 | |
210 | struct timer_rand_state *random; | |
1da177e4 | 211 | atomic_t sync_io; /* RAID */ |
77ea887e | 212 | struct disk_events *ev; |
7ba1ba12 | 213 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
aff34e19 | 214 | struct kobject integrity_kobj; |
25520d55 | 215 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
540eed56 | 216 | int node_id; |
99e6608c | 217 | struct badblocks *bb; |
1da177e4 LT |
218 | }; |
219 | ||
310a2c10 TH |
220 | static inline struct gendisk *part_to_disk(struct hd_struct *part) |
221 | { | |
548b10eb TH |
222 | if (likely(part)) { |
223 | if (part->partno) | |
224 | return dev_to_disk(part_to_dev(part)->parent); | |
225 | else | |
226 | return dev_to_disk(part_to_dev(part)); | |
227 | } | |
310a2c10 TH |
228 | return NULL; |
229 | } | |
230 | ||
446d64e3 MZ |
231 | static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to) |
232 | { | |
63579785 | 233 | uuid_be_to_bin(uuid_str, (uuid_be *)to); |
446d64e3 MZ |
234 | return 0; |
235 | } | |
236 | ||
f331c029 TH |
237 | static inline int disk_max_parts(struct gendisk *disk) |
238 | { | |
689d6fac TH |
239 | if (disk->flags & GENHD_FL_EXT_DEVT) |
240 | return DISK_MAX_PARTS; | |
241 | return disk->minors; | |
b5d0b9df TH |
242 | } |
243 | ||
d27769ec | 244 | static inline bool disk_part_scan_enabled(struct gendisk *disk) |
b5d0b9df | 245 | { |
d27769ec TH |
246 | return disk_max_parts(disk) > 1 && |
247 | !(disk->flags & GENHD_FL_NO_PART_SCAN); | |
f331c029 TH |
248 | } |
249 | ||
250 | static inline dev_t disk_devt(struct gendisk *disk) | |
251 | { | |
ed9e1982 | 252 | return disk_to_dev(disk)->devt; |
f331c029 TH |
253 | } |
254 | ||
255 | static inline dev_t part_devt(struct hd_struct *part) | |
256 | { | |
ed9e1982 | 257 | return part_to_dev(part)->devt; |
f331c029 TH |
258 | } |
259 | ||
e71bf0d0 TH |
260 | extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
261 | ||
262 | static inline void disk_put_part(struct hd_struct *part) | |
263 | { | |
264 | if (likely(part)) | |
ed9e1982 | 265 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
266 | } |
267 | ||
268 | /* | |
269 | * Smarter partition iterator without context limits. | |
270 | */ | |
271 | #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ | |
272 | #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ | |
b5d0b9df | 273 | #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
71982a40 | 274 | #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
e71bf0d0 TH |
275 | |
276 | struct disk_part_iter { | |
277 | struct gendisk *disk; | |
278 | struct hd_struct *part; | |
279 | int idx; | |
280 | unsigned int flags; | |
281 | }; | |
282 | ||
283 | extern void disk_part_iter_init(struct disk_part_iter *piter, | |
284 | struct gendisk *disk, unsigned int flags); | |
285 | extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); | |
286 | extern void disk_part_iter_exit(struct disk_part_iter *piter); | |
287 | ||
288 | extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, | |
289 | sector_t sector); | |
290 | ||
c9959059 | 291 | /* |
1da177e4 LT |
292 | * Macros to operate on percpu disk statistics: |
293 | * | |
c9959059 TH |
294 | * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
295 | * and should be called between disk_stat_lock() and | |
296 | * disk_stat_unlock(). | |
297 | * | |
298 | * part_stat_read() can be called at any time. | |
299 | * | |
300 | * part_stat_{add|set_all}() and {init|free}_part_stats are for | |
301 | * internal use only. | |
1da177e4 LT |
302 | */ |
303 | #ifdef CONFIG_SMP | |
074a7aca TH |
304 | #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
305 | #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) | |
ea5c48ab | 306 | |
074a7aca TH |
307 | #define __part_stat_add(cpu, part, field, addnd) \ |
308 | (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) | |
ea5c48ab JM |
309 | |
310 | #define part_stat_read(part, field) \ | |
311 | ({ \ | |
074a7aca | 312 | typeof((part)->dkstats->field) res = 0; \ |
7af92f87 SH |
313 | unsigned int _cpu; \ |
314 | for_each_possible_cpu(_cpu) \ | |
315 | res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ | |
ea5c48ab JM |
316 | res; \ |
317 | }) | |
318 | ||
28f13702 JA |
319 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
320 | { | |
ea5c48ab | 321 | int i; |
28f13702 | 322 | |
ea5c48ab JM |
323 | for_each_possible_cpu(i) |
324 | memset(per_cpu_ptr(part->dkstats, i), value, | |
28f13702 | 325 | sizeof(struct disk_stats)); |
ea5c48ab | 326 | } |
c9959059 | 327 | |
074a7aca | 328 | static inline int init_part_stats(struct hd_struct *part) |
ea5c48ab | 329 | { |
074a7aca TH |
330 | part->dkstats = alloc_percpu(struct disk_stats); |
331 | if (!part->dkstats) | |
332 | return 0; | |
333 | return 1; | |
1da177e4 | 334 | } |
ea5c48ab | 335 | |
074a7aca | 336 | static inline void free_part_stats(struct hd_struct *part) |
ea5c48ab | 337 | { |
074a7aca | 338 | free_percpu(part->dkstats); |
ea5c48ab JM |
339 | } |
340 | ||
074a7aca TH |
341 | #else /* !CONFIG_SMP */ |
342 | #define part_stat_lock() ({ rcu_read_lock(); 0; }) | |
343 | #define part_stat_unlock() rcu_read_unlock() | |
c9959059 | 344 | |
074a7aca TH |
345 | #define __part_stat_add(cpu, part, field, addnd) \ |
346 | ((part)->dkstats.field += addnd) | |
1da177e4 | 347 | |
074a7aca | 348 | #define part_stat_read(part, field) ((part)->dkstats.field) |
1da177e4 | 349 | |
074a7aca | 350 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
1da177e4 | 351 | { |
074a7aca | 352 | memset(&part->dkstats, value, sizeof(struct disk_stats)); |
1da177e4 | 353 | } |
ea5c48ab JM |
354 | |
355 | static inline int init_part_stats(struct hd_struct *part) | |
356 | { | |
ea5c48ab JM |
357 | return 1; |
358 | } | |
359 | ||
360 | static inline void free_part_stats(struct hd_struct *part) | |
361 | { | |
ea5c48ab JM |
362 | } |
363 | ||
074a7aca | 364 | #endif /* CONFIG_SMP */ |
1da177e4 | 365 | |
074a7aca TH |
366 | #define part_stat_add(cpu, part, field, addnd) do { \ |
367 | __part_stat_add((cpu), (part), field, addnd); \ | |
368 | if ((part)->partno) \ | |
369 | __part_stat_add((cpu), &part_to_disk((part))->part0, \ | |
370 | field, addnd); \ | |
371 | } while (0) | |
ea5c48ab | 372 | |
074a7aca TH |
373 | #define part_stat_dec(cpu, gendiskp, field) \ |
374 | part_stat_add(cpu, gendiskp, field, -1) | |
375 | #define part_stat_inc(cpu, gendiskp, field) \ | |
376 | part_stat_add(cpu, gendiskp, field, 1) | |
377 | #define part_stat_sub(cpu, gendiskp, field, subnd) \ | |
378 | part_stat_add(cpu, gendiskp, field, -subnd) | |
379 | ||
316d315b | 380 | static inline void part_inc_in_flight(struct hd_struct *part, int rw) |
ea5c48ab | 381 | { |
1e9bb880 | 382 | atomic_inc(&part->in_flight[rw]); |
074a7aca | 383 | if (part->partno) |
1e9bb880 | 384 | atomic_inc(&part_to_disk(part)->part0.in_flight[rw]); |
ea5c48ab JM |
385 | } |
386 | ||
316d315b | 387 | static inline void part_dec_in_flight(struct hd_struct *part, int rw) |
ea5c48ab | 388 | { |
1e9bb880 | 389 | atomic_dec(&part->in_flight[rw]); |
074a7aca | 390 | if (part->partno) |
1e9bb880 | 391 | atomic_dec(&part_to_disk(part)->part0.in_flight[rw]); |
316d315b NK |
392 | } |
393 | ||
394 | static inline int part_in_flight(struct hd_struct *part) | |
395 | { | |
1e9bb880 | 396 | return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]); |
ea5c48ab | 397 | } |
1da177e4 | 398 | |
6d1d8050 WD |
399 | static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
400 | { | |
401 | if (disk) | |
402 | return kzalloc_node(sizeof(struct partition_meta_info), | |
403 | GFP_KERNEL, disk->node_id); | |
404 | return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); | |
405 | } | |
406 | ||
407 | static inline void free_part_info(struct hd_struct *part) | |
408 | { | |
409 | kfree(part->info); | |
410 | } | |
411 | ||
d3992286 | 412 | /* block/blk-core.c */ |
c9959059 | 413 | extern void part_round_stats(int cpu, struct hd_struct *part); |
1da177e4 | 414 | |
32ca163c | 415 | /* block/genhd.c */ |
e63a46be DW |
416 | extern void device_add_disk(struct device *parent, struct gendisk *disk); |
417 | static inline void add_disk(struct gendisk *disk) | |
418 | { | |
52c44d93 | 419 | device_add_disk(NULL, disk); |
e63a46be DW |
420 | } |
421 | ||
1da177e4 | 422 | extern void del_gendisk(struct gendisk *gp); |
cf771cb5 | 423 | extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
f331c029 | 424 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
1da177e4 LT |
425 | |
426 | extern void set_device_ro(struct block_device *bdev, int flag); | |
427 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
428 | ||
b7db9956 TH |
429 | static inline int get_disk_ro(struct gendisk *disk) |
430 | { | |
431 | return disk->part0.policy; | |
432 | } | |
433 | ||
77ea887e TH |
434 | extern void disk_block_events(struct gendisk *disk); |
435 | extern void disk_unblock_events(struct gendisk *disk); | |
85ef06d1 | 436 | extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
77ea887e TH |
437 | extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
438 | ||
1da177e4 LT |
439 | /* drivers/char/random.c */ |
440 | extern void add_disk_randomness(struct gendisk *disk); | |
441 | extern void rand_initialize_disk(struct gendisk *disk); | |
442 | ||
443 | static inline sector_t get_start_sect(struct block_device *bdev) | |
444 | { | |
0762b8bd | 445 | return bdev->bd_part->start_sect; |
1da177e4 LT |
446 | } |
447 | static inline sector_t get_capacity(struct gendisk *disk) | |
448 | { | |
80795aef | 449 | return disk->part0.nr_sects; |
1da177e4 LT |
450 | } |
451 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
452 | { | |
80795aef | 453 | disk->part0.nr_sects = size; |
1da177e4 LT |
454 | } |
455 | ||
1da177e4 LT |
456 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
457 | ||
b84d8796 | 458 | #define SOLARIS_X86_NUMSLICE 16 |
1da177e4 LT |
459 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
460 | ||
461 | struct solaris_x86_slice { | |
462 | __le16 s_tag; /* ID tag of partition */ | |
463 | __le16 s_flag; /* permission flags */ | |
464 | __le32 s_start; /* start sector no of partition */ | |
465 | __le32 s_size; /* # of blocks in partition */ | |
466 | }; | |
467 | ||
468 | struct solaris_x86_vtoc { | |
469 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
470 | __le32 v_sanity; /* to verify vtoc sanity */ | |
471 | __le32 v_version; /* layout version */ | |
472 | char v_volume[8]; /* volume name */ | |
473 | __le16 v_sectorsz; /* sector size in bytes */ | |
474 | __le16 v_nparts; /* number of partitions */ | |
475 | unsigned int v_reserved[10]; /* free space */ | |
476 | struct solaris_x86_slice | |
477 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
478 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
479 | char v_asciilabel[128]; /* for compatibility */ | |
480 | }; | |
481 | ||
482 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
483 | ||
484 | #ifdef CONFIG_BSD_DISKLABEL | |
485 | /* | |
486 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
487 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
488 | */ | |
489 | ||
490 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
491 | ||
492 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
493 | #define BSD_MAXPARTITIONS 16 | |
494 | #define OPENBSD_MAXPARTITIONS 16 | |
495 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
496 | struct bsd_disklabel { | |
497 | __le32 d_magic; /* the magic number */ | |
498 | __s16 d_type; /* drive type */ | |
499 | __s16 d_subtype; /* controller/d_type specific */ | |
500 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
501 | char d_packname[16]; /* pack identifier */ | |
502 | __u32 d_secsize; /* # of bytes per sector */ | |
503 | __u32 d_nsectors; /* # of data sectors per track */ | |
504 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
505 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
506 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
507 | __u32 d_secperunit; /* # of data sectors per unit */ | |
508 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
509 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
510 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
511 | __u16 d_rpm; /* rotational speed */ | |
512 | __u16 d_interleave; /* hardware sector interleave */ | |
513 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
514 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
515 | __u32 d_headswitch; /* head switch time, usec */ | |
516 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
517 | __u32 d_flags; /* generic flags */ | |
518 | #define NDDATA 5 | |
519 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
520 | #define NSPARE 5 | |
521 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
522 | __le32 d_magic2; /* the magic number (again) */ | |
523 | __le16 d_checksum; /* xor of data incl. partitions */ | |
524 | ||
525 | /* filesystem and partition information: */ | |
526 | __le16 d_npartitions; /* number of partitions in following */ | |
527 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
528 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
529 | struct bsd_partition { /* the partition table */ | |
530 | __le32 p_size; /* number of sectors in partition */ | |
531 | __le32 p_offset; /* starting sector */ | |
532 | __le32 p_fsize; /* filesystem basic fragment size */ | |
533 | __u8 p_fstype; /* filesystem type, see below */ | |
534 | __u8 p_frag; /* filesystem fragments per block */ | |
535 | __le16 p_cpg; /* filesystem cylinders per group */ | |
536 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
537 | }; | |
538 | ||
539 | #endif /* CONFIG_BSD_DISKLABEL */ | |
540 | ||
541 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
542 | /* | |
543 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
544 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
545 | */ | |
546 | ||
547 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
548 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
549 | #define UNIXWARE_NUMSLICE 16 | |
550 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
551 | ||
552 | struct unixware_slice { | |
553 | __le16 s_label; /* label */ | |
554 | __le16 s_flags; /* permission flags */ | |
555 | __le32 start_sect; /* starting sector */ | |
556 | __le32 nr_sects; /* number of sectors in slice */ | |
557 | }; | |
558 | ||
559 | struct unixware_disklabel { | |
560 | __le32 d_type; /* drive type */ | |
561 | __le32 d_magic; /* the magic number */ | |
562 | __le32 d_version; /* version number */ | |
563 | char d_serial[12]; /* serial number of the device */ | |
564 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
565 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
566 | __le32 d_nsectors; /* # of data sectors per track */ | |
567 | __le32 d_secsize; /* # of bytes per sector */ | |
568 | __le32 d_part_start; /* # of first sector of this partition */ | |
569 | __le32 d_unknown1[12]; /* ? */ | |
570 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
571 | __le32 d_alt_len; /* byte length of alternate table */ | |
572 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
573 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
574 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
575 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
576 | __le32 d_unknown2; /* ? */ | |
577 | __le32 d_unknown3; /* ? */ | |
578 | __le32 d_pad[8]; /* pad */ | |
579 | ||
580 | struct unixware_vtoc { | |
581 | __le32 v_magic; /* the magic number */ | |
582 | __le32 v_version; /* version number */ | |
583 | char v_name[8]; /* volume name */ | |
584 | __le16 v_nslices; /* # of slices */ | |
585 | __le16 v_unknown1; /* ? */ | |
586 | __le32 v_reserved[10]; /* reserved */ | |
587 | struct unixware_slice | |
588 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
589 | } vtoc; | |
590 | ||
591 | }; /* 408 */ | |
592 | ||
593 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
594 | ||
595 | #ifdef CONFIG_MINIX_SUBPARTITION | |
596 | # define MINIX_NR_SUBPARTITIONS 4 | |
597 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
598 | ||
d18d7682 FMDN |
599 | #define ADDPART_FLAG_NONE 0 |
600 | #define ADDPART_FLAG_RAID 1 | |
601 | #define ADDPART_FLAG_WHOLEDISK 2 | |
602 | ||
bcce3de1 TH |
603 | extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
604 | extern void blk_free_devt(dev_t devt); | |
cf771cb5 TH |
605 | extern dev_t blk_lookup_devt(const char *name, int partno); |
606 | extern char *disk_name (struct gendisk *hd, int partno, char *buf); | |
1da177e4 | 607 | |
540eed56 | 608 | extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
1da177e4 | 609 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
fe316bf2 | 610 | extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); |
ba32929a TH |
611 | extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
612 | int partno, sector_t start, | |
6d1d8050 WD |
613 | sector_t len, int flags, |
614 | struct partition_meta_info | |
615 | *info); | |
6c71013e | 616 | extern void __delete_partition(struct percpu_ref *); |
1da177e4 | 617 | extern void delete_partition(struct gendisk *, int); |
dd2a345f | 618 | extern void printk_all_partitions(void); |
1da177e4 | 619 | |
1946089a | 620 | extern struct gendisk *alloc_disk_node(int minors, int node_id); |
1da177e4 LT |
621 | extern struct gendisk *alloc_disk(int minors); |
622 | extern struct kobject *get_disk(struct gendisk *disk); | |
623 | extern void put_disk(struct gendisk *disk); | |
edfaa7c3 | 624 | extern void blk_register_region(dev_t devt, unsigned long range, |
1da177e4 LT |
625 | struct module *module, |
626 | struct kobject *(*probe)(dev_t, int *, void *), | |
627 | int (*lock)(dev_t, void *), | |
628 | void *data); | |
edfaa7c3 | 629 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
1da177e4 | 630 | |
e5610521 TH |
631 | extern ssize_t part_size_show(struct device *dev, |
632 | struct device_attribute *attr, char *buf); | |
074a7aca TH |
633 | extern ssize_t part_stat_show(struct device *dev, |
634 | struct device_attribute *attr, char *buf); | |
316d315b NK |
635 | extern ssize_t part_inflight_show(struct device *dev, |
636 | struct device_attribute *attr, char *buf); | |
eddb2e26 TH |
637 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
638 | extern ssize_t part_fail_show(struct device *dev, | |
639 | struct device_attribute *attr, char *buf); | |
640 | extern ssize_t part_fail_store(struct device *dev, | |
641 | struct device_attribute *attr, | |
642 | const char *buf, size_t count); | |
643 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ | |
e5610521 | 644 | |
6c71013e | 645 | static inline int hd_ref_init(struct hd_struct *part) |
6c23a968 | 646 | { |
6c71013e ML |
647 | if (percpu_ref_init(&part->ref, __delete_partition, 0, |
648 | GFP_KERNEL)) | |
649 | return -ENOMEM; | |
650 | return 0; | |
6c23a968 JA |
651 | } |
652 | ||
653 | static inline void hd_struct_get(struct hd_struct *part) | |
654 | { | |
6c71013e | 655 | percpu_ref_get(&part->ref); |
6c23a968 JA |
656 | } |
657 | ||
658 | static inline int hd_struct_try_get(struct hd_struct *part) | |
659 | { | |
6c71013e | 660 | return percpu_ref_tryget_live(&part->ref); |
6c23a968 JA |
661 | } |
662 | ||
663 | static inline void hd_struct_put(struct hd_struct *part) | |
664 | { | |
6c71013e ML |
665 | percpu_ref_put(&part->ref); |
666 | } | |
667 | ||
668 | static inline void hd_struct_kill(struct hd_struct *part) | |
669 | { | |
670 | percpu_ref_kill(&part->ref); | |
6c23a968 JA |
671 | } |
672 | ||
b54e5ed8 ML |
673 | static inline void hd_free_part(struct hd_struct *part) |
674 | { | |
675 | free_part_stats(part); | |
676 | free_part_info(part); | |
6c71013e | 677 | percpu_ref_exit(&part->ref); |
b54e5ed8 ML |
678 | } |
679 | ||
c83f6bf9 VG |
680 | /* |
681 | * Any access of part->nr_sects which is not protected by partition | |
682 | * bd_mutex or gendisk bdev bd_mutex, should be done using this | |
683 | * accessor function. | |
684 | * | |
685 | * Code written along the lines of i_size_read() and i_size_write(). | |
686 | * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption | |
687 | * on. | |
688 | */ | |
689 | static inline sector_t part_nr_sects_read(struct hd_struct *part) | |
690 | { | |
691 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) | |
692 | sector_t nr_sects; | |
693 | unsigned seq; | |
694 | do { | |
695 | seq = read_seqcount_begin(&part->nr_sects_seq); | |
696 | nr_sects = part->nr_sects; | |
697 | } while (read_seqcount_retry(&part->nr_sects_seq, seq)); | |
698 | return nr_sects; | |
699 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) | |
700 | sector_t nr_sects; | |
701 | ||
702 | preempt_disable(); | |
703 | nr_sects = part->nr_sects; | |
704 | preempt_enable(); | |
705 | return nr_sects; | |
706 | #else | |
707 | return part->nr_sects; | |
708 | #endif | |
709 | } | |
710 | ||
711 | /* | |
712 | * Should be called with mutex lock held (typically bd_mutex) of partition | |
713 | * to provide mutual exlusion among writers otherwise seqcount might be | |
714 | * left in wrong state leaving the readers spinning infinitely. | |
715 | */ | |
716 | static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) | |
717 | { | |
718 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) | |
719 | write_seqcount_begin(&part->nr_sects_seq); | |
720 | part->nr_sects = size; | |
721 | write_seqcount_end(&part->nr_sects_seq); | |
722 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) | |
723 | preempt_disable(); | |
724 | part->nr_sects = size; | |
725 | preempt_enable(); | |
726 | #else | |
727 | part->nr_sects = size; | |
728 | #endif | |
729 | } | |
730 | ||
25520d55 MP |
731 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
732 | extern void blk_integrity_add(struct gendisk *); | |
733 | extern void blk_integrity_del(struct gendisk *); | |
734 | extern void blk_integrity_revalidate(struct gendisk *); | |
735 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
736 | static inline void blk_integrity_add(struct gendisk *disk) { } | |
737 | static inline void blk_integrity_del(struct gendisk *disk) { } | |
738 | static inline void blk_integrity_revalidate(struct gendisk *disk) { } | |
739 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
740 | ||
87c1efbf JA |
741 | #else /* CONFIG_BLOCK */ |
742 | ||
743 | static inline void printk_all_partitions(void) { } | |
744 | ||
cf771cb5 | 745 | static inline dev_t blk_lookup_devt(const char *name, int partno) |
edfaa7c3 KS |
746 | { |
747 | dev_t devt = MKDEV(0, 0); | |
748 | return devt; | |
749 | } | |
750 | ||
446d64e3 MZ |
751 | static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to) |
752 | { | |
753 | return -EINVAL; | |
754 | } | |
87c1efbf | 755 | #endif /* CONFIG_BLOCK */ |
9361401e | 756 | |
a8ae50ba | 757 | #endif /* _LINUX_GENHD_H */ |