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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> |
1da177e4 | 16 | |
9361401e DH |
17 | #ifdef CONFIG_BLOCK |
18 | ||
ed9e1982 | 19 | #define kobj_to_dev(k) container_of((k), struct device, kobj) |
548b10eb | 20 | #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
ed9e1982 | 21 | #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
548b10eb | 22 | #define disk_to_dev(disk) (&(disk)->part0.__dev) |
ed9e1982 | 23 | #define part_to_dev(part) (&((part)->__dev)) |
edfaa7c3 | 24 | |
edfaa7c3 KS |
25 | extern struct device_type part_type; |
26 | extern struct kobject *block_depr; | |
27 | extern struct class block_class; | |
28 | ||
1da177e4 LT |
29 | enum { |
30 | /* These three have identical behaviour; use the second one if DOS FDISK gets | |
31 | confused about extended/logical partitions starting past cylinder 1023. */ | |
32 | DOS_EXTENDED_PARTITION = 5, | |
33 | LINUX_EXTENDED_PARTITION = 0x85, | |
34 | WIN98_EXTENDED_PARTITION = 0x0f, | |
35 | ||
d18d7682 FMDN |
36 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
37 | ||
1da177e4 | 38 | LINUX_SWAP_PARTITION = 0x82, |
4419d1ac OH |
39 | LINUX_DATA_PARTITION = 0x83, |
40 | LINUX_LVM_PARTITION = 0x8e, | |
1da177e4 LT |
41 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
42 | ||
43 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, | |
44 | NEW_SOLARIS_X86_PARTITION = 0xbf, | |
45 | ||
46 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ | |
47 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ | |
48 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ | |
49 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ | |
50 | ||
51 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ | |
52 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ | |
53 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ | |
54 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ | |
55 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ | |
56 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ | |
57 | }; | |
58 | ||
689d6fac | 59 | #define DISK_MAX_PARTS 256 |
3e1a7ff8 | 60 | #define DISK_NAME_LEN 32 |
689d6fac | 61 | |
34186efc DW |
62 | #include <linux/major.h> |
63 | #include <linux/device.h> | |
64 | #include <linux/smp.h> | |
65 | #include <linux/string.h> | |
66 | #include <linux/fs.h> | |
8ce7ad7b | 67 | #include <linux/workqueue.h> |
34186efc | 68 | |
1da177e4 LT |
69 | struct partition { |
70 | unsigned char boot_ind; /* 0x80 - active */ | |
71 | unsigned char head; /* starting head */ | |
72 | unsigned char sector; /* starting sector */ | |
73 | unsigned char cyl; /* starting cylinder */ | |
74 | unsigned char sys_ind; /* What partition type */ | |
75 | unsigned char end_head; /* end head */ | |
76 | unsigned char end_sector; /* end sector */ | |
77 | unsigned char end_cyl; /* end cylinder */ | |
78 | __le32 start_sect; /* starting sector counting from 0 */ | |
79 | __le32 nr_sects; /* nr of sectors in partition */ | |
80 | } __attribute__((packed)); | |
81 | ||
ea5c48ab JM |
82 | struct disk_stats { |
83 | unsigned long sectors[2]; /* READs and WRITEs */ | |
84 | unsigned long ios[2]; | |
85 | unsigned long merges[2]; | |
86 | unsigned long ticks[2]; | |
87 | unsigned long io_ticks; | |
88 | unsigned long time_in_queue; | |
89 | }; | |
6d1d8050 WD |
90 | |
91 | #define PARTITION_META_INFO_VOLNAMELTH 64 | |
92 | #define PARTITION_META_INFO_UUIDLTH 16 | |
93 | ||
94 | struct partition_meta_info { | |
95 | u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */ | |
96 | u8 volname[PARTITION_META_INFO_VOLNAMELTH]; | |
97 | }; | |
98 | ||
1da177e4 LT |
99 | struct hd_struct { |
100 | sector_t start_sect; | |
101 | sector_t nr_sects; | |
c72758f3 | 102 | sector_t alignment_offset; |
a1706ac4 | 103 | unsigned int discard_alignment; |
ed9e1982 | 104 | struct device __dev; |
6a4d44c1 | 105 | struct kobject *holder_dir; |
1da177e4 | 106 | int policy, partno; |
6d1d8050 | 107 | struct partition_meta_info *info; |
c17bb495 AM |
108 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
109 | int make_it_fail; | |
ea5c48ab JM |
110 | #endif |
111 | unsigned long stamp; | |
1e9bb880 | 112 | atomic_t in_flight[2]; |
ea5c48ab | 113 | #ifdef CONFIG_SMP |
43cf38eb | 114 | struct disk_stats __percpu *dkstats; |
ea5c48ab JM |
115 | #else |
116 | struct disk_stats dkstats; | |
c17bb495 | 117 | #endif |
6c23a968 | 118 | atomic_t ref; |
e71bf0d0 | 119 | struct rcu_head rcu_head; |
1da177e4 LT |
120 | }; |
121 | ||
122 | #define GENHD_FL_REMOVABLE 1 | |
97fedbbe | 123 | /* 2 is unused */ |
86ce18d7 | 124 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
1da177e4 LT |
125 | #define GENHD_FL_CD 8 |
126 | #define GENHD_FL_UP 16 | |
127 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 | |
689d6fac | 128 | #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
db429e9e | 129 | #define GENHD_FL_NATIVE_CAPACITY 128 |
d4dc210f | 130 | #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
d27769ec | 131 | #define GENHD_FL_NO_PART_SCAN 512 |
1da177e4 | 132 | |
77ea887e TH |
133 | enum { |
134 | DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ | |
135 | DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ | |
136 | }; | |
137 | ||
540eed56 TH |
138 | #define BLK_SCSI_MAX_CMDS (256) |
139 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
140 | ||
141 | struct blk_scsi_cmd_filter { | |
142 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; | |
143 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
144 | struct kobject kobj; | |
145 | }; | |
146 | ||
147 | struct disk_part_tbl { | |
148 | struct rcu_head rcu_head; | |
149 | int len; | |
4d2deb40 AB |
150 | struct hd_struct __rcu *last_lookup; |
151 | struct hd_struct __rcu *part[]; | |
540eed56 TH |
152 | }; |
153 | ||
77ea887e TH |
154 | struct disk_events; |
155 | ||
1da177e4 | 156 | struct gendisk { |
689d6fac TH |
157 | /* major, first_minor and minors are input parameters only, |
158 | * don't use directly. Use disk_devt() and disk_max_parts(). | |
f331c029 | 159 | */ |
1da177e4 LT |
160 | int major; /* major number of driver */ |
161 | int first_minor; | |
162 | int minors; /* maximum number of minors, =1 for | |
163 | * disks that can't be partitioned. */ | |
f331c029 | 164 | |
3e1a7ff8 | 165 | char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
e454cea2 | 166 | char *(*devnode)(struct gendisk *gd, mode_t *mode); |
77ea887e TH |
167 | |
168 | unsigned int events; /* supported events */ | |
169 | unsigned int async_events; /* async events, subset of all */ | |
170 | ||
b5d0b9df | 171 | /* Array of pointers to partitions indexed by partno. |
e71bf0d0 TH |
172 | * Protected with matching bdev lock but stat and other |
173 | * non-critical accesses use RCU. Always access through | |
174 | * helpers. | |
175 | */ | |
4d2deb40 | 176 | struct disk_part_tbl __rcu *part_tbl; |
b5d0b9df | 177 | struct hd_struct part0; |
e71bf0d0 | 178 | |
83d5cde4 | 179 | const struct block_device_operations *fops; |
1da177e4 LT |
180 | struct request_queue *queue; |
181 | void *private_data; | |
1da177e4 LT |
182 | |
183 | int flags; | |
edfaa7c3 | 184 | struct device *driverfs_dev; // FIXME: remove |
6a4d44c1 | 185 | struct kobject *slave_dir; |
1da177e4 LT |
186 | |
187 | struct timer_rand_state *random; | |
1da177e4 | 188 | atomic_t sync_io; /* RAID */ |
77ea887e | 189 | struct disk_events *ev; |
7ba1ba12 MP |
190 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
191 | struct blk_integrity *integrity; | |
192 | #endif | |
540eed56 | 193 | int node_id; |
1da177e4 LT |
194 | }; |
195 | ||
310a2c10 TH |
196 | static inline struct gendisk *part_to_disk(struct hd_struct *part) |
197 | { | |
548b10eb TH |
198 | if (likely(part)) { |
199 | if (part->partno) | |
200 | return dev_to_disk(part_to_dev(part)->parent); | |
201 | else | |
202 | return dev_to_disk(part_to_dev(part)); | |
203 | } | |
310a2c10 TH |
204 | return NULL; |
205 | } | |
206 | ||
6d1d8050 WD |
207 | static inline void part_pack_uuid(const u8 *uuid_str, u8 *to) |
208 | { | |
209 | int i; | |
210 | for (i = 0; i < 16; ++i) { | |
211 | *to++ = (hex_to_bin(*uuid_str) << 4) | | |
212 | (hex_to_bin(*(uuid_str + 1))); | |
213 | uuid_str += 2; | |
214 | switch (i) { | |
215 | case 3: | |
216 | case 5: | |
217 | case 7: | |
218 | case 9: | |
219 | uuid_str++; | |
220 | continue; | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
225 | static inline char *part_unpack_uuid(const u8 *uuid, char *out) | |
226 | { | |
227 | sprintf(out, "%pU", uuid); | |
228 | return out; | |
229 | } | |
230 | ||
f331c029 TH |
231 | static inline int disk_max_parts(struct gendisk *disk) |
232 | { | |
689d6fac TH |
233 | if (disk->flags & GENHD_FL_EXT_DEVT) |
234 | return DISK_MAX_PARTS; | |
235 | return disk->minors; | |
b5d0b9df TH |
236 | } |
237 | ||
d27769ec | 238 | static inline bool disk_part_scan_enabled(struct gendisk *disk) |
b5d0b9df | 239 | { |
d27769ec TH |
240 | return disk_max_parts(disk) > 1 && |
241 | !(disk->flags & GENHD_FL_NO_PART_SCAN); | |
f331c029 TH |
242 | } |
243 | ||
244 | static inline dev_t disk_devt(struct gendisk *disk) | |
245 | { | |
ed9e1982 | 246 | return disk_to_dev(disk)->devt; |
f331c029 TH |
247 | } |
248 | ||
249 | static inline dev_t part_devt(struct hd_struct *part) | |
250 | { | |
ed9e1982 | 251 | return part_to_dev(part)->devt; |
f331c029 TH |
252 | } |
253 | ||
e71bf0d0 TH |
254 | extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
255 | ||
256 | static inline void disk_put_part(struct hd_struct *part) | |
257 | { | |
258 | if (likely(part)) | |
ed9e1982 | 259 | put_device(part_to_dev(part)); |
e71bf0d0 TH |
260 | } |
261 | ||
262 | /* | |
263 | * Smarter partition iterator without context limits. | |
264 | */ | |
265 | #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ | |
266 | #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ | |
b5d0b9df | 267 | #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
71982a40 | 268 | #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
e71bf0d0 TH |
269 | |
270 | struct disk_part_iter { | |
271 | struct gendisk *disk; | |
272 | struct hd_struct *part; | |
273 | int idx; | |
274 | unsigned int flags; | |
275 | }; | |
276 | ||
277 | extern void disk_part_iter_init(struct disk_part_iter *piter, | |
278 | struct gendisk *disk, unsigned int flags); | |
279 | extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); | |
280 | extern void disk_part_iter_exit(struct disk_part_iter *piter); | |
281 | ||
282 | extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, | |
283 | sector_t sector); | |
284 | ||
c9959059 | 285 | /* |
1da177e4 LT |
286 | * Macros to operate on percpu disk statistics: |
287 | * | |
c9959059 TH |
288 | * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
289 | * and should be called between disk_stat_lock() and | |
290 | * disk_stat_unlock(). | |
291 | * | |
292 | * part_stat_read() can be called at any time. | |
293 | * | |
294 | * part_stat_{add|set_all}() and {init|free}_part_stats are for | |
295 | * internal use only. | |
1da177e4 LT |
296 | */ |
297 | #ifdef CONFIG_SMP | |
074a7aca TH |
298 | #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
299 | #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) | |
ea5c48ab | 300 | |
074a7aca TH |
301 | #define __part_stat_add(cpu, part, field, addnd) \ |
302 | (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) | |
ea5c48ab JM |
303 | |
304 | #define part_stat_read(part, field) \ | |
305 | ({ \ | |
074a7aca | 306 | typeof((part)->dkstats->field) res = 0; \ |
7af92f87 SH |
307 | unsigned int _cpu; \ |
308 | for_each_possible_cpu(_cpu) \ | |
309 | res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ | |
ea5c48ab JM |
310 | res; \ |
311 | }) | |
312 | ||
28f13702 JA |
313 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
314 | { | |
ea5c48ab | 315 | int i; |
28f13702 | 316 | |
ea5c48ab JM |
317 | for_each_possible_cpu(i) |
318 | memset(per_cpu_ptr(part->dkstats, i), value, | |
28f13702 | 319 | sizeof(struct disk_stats)); |
ea5c48ab | 320 | } |
c9959059 | 321 | |
074a7aca | 322 | static inline int init_part_stats(struct hd_struct *part) |
ea5c48ab | 323 | { |
074a7aca TH |
324 | part->dkstats = alloc_percpu(struct disk_stats); |
325 | if (!part->dkstats) | |
326 | return 0; | |
327 | return 1; | |
1da177e4 | 328 | } |
ea5c48ab | 329 | |
074a7aca | 330 | static inline void free_part_stats(struct hd_struct *part) |
ea5c48ab | 331 | { |
074a7aca | 332 | free_percpu(part->dkstats); |
ea5c48ab JM |
333 | } |
334 | ||
074a7aca TH |
335 | #else /* !CONFIG_SMP */ |
336 | #define part_stat_lock() ({ rcu_read_lock(); 0; }) | |
337 | #define part_stat_unlock() rcu_read_unlock() | |
c9959059 | 338 | |
074a7aca TH |
339 | #define __part_stat_add(cpu, part, field, addnd) \ |
340 | ((part)->dkstats.field += addnd) | |
1da177e4 | 341 | |
074a7aca | 342 | #define part_stat_read(part, field) ((part)->dkstats.field) |
1da177e4 | 343 | |
074a7aca | 344 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
1da177e4 | 345 | { |
074a7aca | 346 | memset(&part->dkstats, value, sizeof(struct disk_stats)); |
1da177e4 | 347 | } |
ea5c48ab JM |
348 | |
349 | static inline int init_part_stats(struct hd_struct *part) | |
350 | { | |
ea5c48ab JM |
351 | return 1; |
352 | } | |
353 | ||
354 | static inline void free_part_stats(struct hd_struct *part) | |
355 | { | |
ea5c48ab JM |
356 | } |
357 | ||
074a7aca | 358 | #endif /* CONFIG_SMP */ |
1da177e4 | 359 | |
074a7aca TH |
360 | #define part_stat_add(cpu, part, field, addnd) do { \ |
361 | __part_stat_add((cpu), (part), field, addnd); \ | |
362 | if ((part)->partno) \ | |
363 | __part_stat_add((cpu), &part_to_disk((part))->part0, \ | |
364 | field, addnd); \ | |
365 | } while (0) | |
ea5c48ab | 366 | |
074a7aca TH |
367 | #define part_stat_dec(cpu, gendiskp, field) \ |
368 | part_stat_add(cpu, gendiskp, field, -1) | |
369 | #define part_stat_inc(cpu, gendiskp, field) \ | |
370 | part_stat_add(cpu, gendiskp, field, 1) | |
371 | #define part_stat_sub(cpu, gendiskp, field, subnd) \ | |
372 | part_stat_add(cpu, gendiskp, field, -subnd) | |
373 | ||
316d315b | 374 | static inline void part_inc_in_flight(struct hd_struct *part, int rw) |
ea5c48ab | 375 | { |
1e9bb880 | 376 | atomic_inc(&part->in_flight[rw]); |
074a7aca | 377 | if (part->partno) |
1e9bb880 | 378 | atomic_inc(&part_to_disk(part)->part0.in_flight[rw]); |
ea5c48ab JM |
379 | } |
380 | ||
316d315b | 381 | static inline void part_dec_in_flight(struct hd_struct *part, int rw) |
ea5c48ab | 382 | { |
1e9bb880 | 383 | atomic_dec(&part->in_flight[rw]); |
074a7aca | 384 | if (part->partno) |
1e9bb880 | 385 | atomic_dec(&part_to_disk(part)->part0.in_flight[rw]); |
316d315b NK |
386 | } |
387 | ||
388 | static inline int part_in_flight(struct hd_struct *part) | |
389 | { | |
1e9bb880 | 390 | return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]); |
ea5c48ab | 391 | } |
1da177e4 | 392 | |
6d1d8050 WD |
393 | static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
394 | { | |
395 | if (disk) | |
396 | return kzalloc_node(sizeof(struct partition_meta_info), | |
397 | GFP_KERNEL, disk->node_id); | |
398 | return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); | |
399 | } | |
400 | ||
401 | static inline void free_part_info(struct hd_struct *part) | |
402 | { | |
403 | kfree(part->info); | |
404 | } | |
405 | ||
d3992286 | 406 | /* block/blk-core.c */ |
c9959059 | 407 | extern void part_round_stats(int cpu, struct hd_struct *part); |
1da177e4 | 408 | |
32ca163c | 409 | /* block/genhd.c */ |
1da177e4 LT |
410 | extern void add_disk(struct gendisk *disk); |
411 | extern void del_gendisk(struct gendisk *gp); | |
cf771cb5 | 412 | extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
f331c029 | 413 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
1da177e4 LT |
414 | |
415 | extern void set_device_ro(struct block_device *bdev, int flag); | |
416 | extern void set_disk_ro(struct gendisk *disk, int flag); | |
417 | ||
b7db9956 TH |
418 | static inline int get_disk_ro(struct gendisk *disk) |
419 | { | |
420 | return disk->part0.policy; | |
421 | } | |
422 | ||
77ea887e TH |
423 | extern void disk_block_events(struct gendisk *disk); |
424 | extern void disk_unblock_events(struct gendisk *disk); | |
85ef06d1 | 425 | extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
77ea887e TH |
426 | extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
427 | ||
1da177e4 LT |
428 | /* drivers/char/random.c */ |
429 | extern void add_disk_randomness(struct gendisk *disk); | |
430 | extern void rand_initialize_disk(struct gendisk *disk); | |
431 | ||
432 | static inline sector_t get_start_sect(struct block_device *bdev) | |
433 | { | |
0762b8bd | 434 | return bdev->bd_part->start_sect; |
1da177e4 LT |
435 | } |
436 | static inline sector_t get_capacity(struct gendisk *disk) | |
437 | { | |
80795aef | 438 | return disk->part0.nr_sects; |
1da177e4 LT |
439 | } |
440 | static inline void set_capacity(struct gendisk *disk, sector_t size) | |
441 | { | |
80795aef | 442 | disk->part0.nr_sects = size; |
1da177e4 LT |
443 | } |
444 | ||
1da177e4 LT |
445 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
446 | ||
b84d8796 | 447 | #define SOLARIS_X86_NUMSLICE 16 |
1da177e4 LT |
448 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
449 | ||
450 | struct solaris_x86_slice { | |
451 | __le16 s_tag; /* ID tag of partition */ | |
452 | __le16 s_flag; /* permission flags */ | |
453 | __le32 s_start; /* start sector no of partition */ | |
454 | __le32 s_size; /* # of blocks in partition */ | |
455 | }; | |
456 | ||
457 | struct solaris_x86_vtoc { | |
458 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ | |
459 | __le32 v_sanity; /* to verify vtoc sanity */ | |
460 | __le32 v_version; /* layout version */ | |
461 | char v_volume[8]; /* volume name */ | |
462 | __le16 v_sectorsz; /* sector size in bytes */ | |
463 | __le16 v_nparts; /* number of partitions */ | |
464 | unsigned int v_reserved[10]; /* free space */ | |
465 | struct solaris_x86_slice | |
466 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ | |
467 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ | |
468 | char v_asciilabel[128]; /* for compatibility */ | |
469 | }; | |
470 | ||
471 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ | |
472 | ||
473 | #ifdef CONFIG_BSD_DISKLABEL | |
474 | /* | |
475 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> | |
476 | * updated by Marc Espie <Marc.Espie@openbsd.org> | |
477 | */ | |
478 | ||
479 | /* check against BSD src/sys/sys/disklabel.h for consistency */ | |
480 | ||
481 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ | |
482 | #define BSD_MAXPARTITIONS 16 | |
483 | #define OPENBSD_MAXPARTITIONS 16 | |
484 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ | |
485 | struct bsd_disklabel { | |
486 | __le32 d_magic; /* the magic number */ | |
487 | __s16 d_type; /* drive type */ | |
488 | __s16 d_subtype; /* controller/d_type specific */ | |
489 | char d_typename[16]; /* type name, e.g. "eagle" */ | |
490 | char d_packname[16]; /* pack identifier */ | |
491 | __u32 d_secsize; /* # of bytes per sector */ | |
492 | __u32 d_nsectors; /* # of data sectors per track */ | |
493 | __u32 d_ntracks; /* # of tracks per cylinder */ | |
494 | __u32 d_ncylinders; /* # of data cylinders per unit */ | |
495 | __u32 d_secpercyl; /* # of data sectors per cylinder */ | |
496 | __u32 d_secperunit; /* # of data sectors per unit */ | |
497 | __u16 d_sparespertrack; /* # of spare sectors per track */ | |
498 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ | |
499 | __u32 d_acylinders; /* # of alt. cylinders per unit */ | |
500 | __u16 d_rpm; /* rotational speed */ | |
501 | __u16 d_interleave; /* hardware sector interleave */ | |
502 | __u16 d_trackskew; /* sector 0 skew, per track */ | |
503 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ | |
504 | __u32 d_headswitch; /* head switch time, usec */ | |
505 | __u32 d_trkseek; /* track-to-track seek, usec */ | |
506 | __u32 d_flags; /* generic flags */ | |
507 | #define NDDATA 5 | |
508 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ | |
509 | #define NSPARE 5 | |
510 | __u32 d_spare[NSPARE]; /* reserved for future use */ | |
511 | __le32 d_magic2; /* the magic number (again) */ | |
512 | __le16 d_checksum; /* xor of data incl. partitions */ | |
513 | ||
514 | /* filesystem and partition information: */ | |
515 | __le16 d_npartitions; /* number of partitions in following */ | |
516 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ | |
517 | __le32 d_sbsize; /* max size of fs superblock, bytes */ | |
518 | struct bsd_partition { /* the partition table */ | |
519 | __le32 p_size; /* number of sectors in partition */ | |
520 | __le32 p_offset; /* starting sector */ | |
521 | __le32 p_fsize; /* filesystem basic fragment size */ | |
522 | __u8 p_fstype; /* filesystem type, see below */ | |
523 | __u8 p_frag; /* filesystem fragments per block */ | |
524 | __le16 p_cpg; /* filesystem cylinders per group */ | |
525 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ | |
526 | }; | |
527 | ||
528 | #endif /* CONFIG_BSD_DISKLABEL */ | |
529 | ||
530 | #ifdef CONFIG_UNIXWARE_DISKLABEL | |
531 | /* | |
532 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> | |
533 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> | |
534 | */ | |
535 | ||
536 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ | |
537 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ | |
538 | #define UNIXWARE_NUMSLICE 16 | |
539 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ | |
540 | ||
541 | struct unixware_slice { | |
542 | __le16 s_label; /* label */ | |
543 | __le16 s_flags; /* permission flags */ | |
544 | __le32 start_sect; /* starting sector */ | |
545 | __le32 nr_sects; /* number of sectors in slice */ | |
546 | }; | |
547 | ||
548 | struct unixware_disklabel { | |
549 | __le32 d_type; /* drive type */ | |
550 | __le32 d_magic; /* the magic number */ | |
551 | __le32 d_version; /* version number */ | |
552 | char d_serial[12]; /* serial number of the device */ | |
553 | __le32 d_ncylinders; /* # of data cylinders per device */ | |
554 | __le32 d_ntracks; /* # of tracks per cylinder */ | |
555 | __le32 d_nsectors; /* # of data sectors per track */ | |
556 | __le32 d_secsize; /* # of bytes per sector */ | |
557 | __le32 d_part_start; /* # of first sector of this partition */ | |
558 | __le32 d_unknown1[12]; /* ? */ | |
559 | __le32 d_alt_tbl; /* byte offset of alternate table */ | |
560 | __le32 d_alt_len; /* byte length of alternate table */ | |
561 | __le32 d_phys_cyl; /* # of physical cylinders per device */ | |
562 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ | |
563 | __le32 d_phys_sec; /* # of physical sectors per track */ | |
564 | __le32 d_phys_bytes; /* # of physical bytes per sector */ | |
565 | __le32 d_unknown2; /* ? */ | |
566 | __le32 d_unknown3; /* ? */ | |
567 | __le32 d_pad[8]; /* pad */ | |
568 | ||
569 | struct unixware_vtoc { | |
570 | __le32 v_magic; /* the magic number */ | |
571 | __le32 v_version; /* version number */ | |
572 | char v_name[8]; /* volume name */ | |
573 | __le16 v_nslices; /* # of slices */ | |
574 | __le16 v_unknown1; /* ? */ | |
575 | __le32 v_reserved[10]; /* reserved */ | |
576 | struct unixware_slice | |
577 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ | |
578 | } vtoc; | |
579 | ||
580 | }; /* 408 */ | |
581 | ||
582 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ | |
583 | ||
584 | #ifdef CONFIG_MINIX_SUBPARTITION | |
585 | # define MINIX_NR_SUBPARTITIONS 4 | |
586 | #endif /* CONFIG_MINIX_SUBPARTITION */ | |
587 | ||
d18d7682 FMDN |
588 | #define ADDPART_FLAG_NONE 0 |
589 | #define ADDPART_FLAG_RAID 1 | |
590 | #define ADDPART_FLAG_WHOLEDISK 2 | |
591 | ||
bcce3de1 TH |
592 | extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
593 | extern void blk_free_devt(dev_t devt); | |
cf771cb5 TH |
594 | extern dev_t blk_lookup_devt(const char *name, int partno); |
595 | extern char *disk_name (struct gendisk *hd, int partno, char *buf); | |
1da177e4 | 596 | |
540eed56 | 597 | extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
1da177e4 | 598 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
ba32929a TH |
599 | extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
600 | int partno, sector_t start, | |
6d1d8050 WD |
601 | sector_t len, int flags, |
602 | struct partition_meta_info | |
603 | *info); | |
6c23a968 | 604 | extern void __delete_partition(struct hd_struct *); |
1da177e4 | 605 | extern void delete_partition(struct gendisk *, int); |
dd2a345f | 606 | extern void printk_all_partitions(void); |
1da177e4 | 607 | |
1946089a | 608 | extern struct gendisk *alloc_disk_node(int minors, int node_id); |
1da177e4 LT |
609 | extern struct gendisk *alloc_disk(int minors); |
610 | extern struct kobject *get_disk(struct gendisk *disk); | |
611 | extern void put_disk(struct gendisk *disk); | |
edfaa7c3 | 612 | extern void blk_register_region(dev_t devt, unsigned long range, |
1da177e4 LT |
613 | struct module *module, |
614 | struct kobject *(*probe)(dev_t, int *, void *), | |
615 | int (*lock)(dev_t, void *), | |
616 | void *data); | |
edfaa7c3 | 617 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
1da177e4 | 618 | |
e5610521 TH |
619 | extern ssize_t part_size_show(struct device *dev, |
620 | struct device_attribute *attr, char *buf); | |
074a7aca TH |
621 | extern ssize_t part_stat_show(struct device *dev, |
622 | struct device_attribute *attr, char *buf); | |
316d315b NK |
623 | extern ssize_t part_inflight_show(struct device *dev, |
624 | struct device_attribute *attr, char *buf); | |
eddb2e26 TH |
625 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
626 | extern ssize_t part_fail_show(struct device *dev, | |
627 | struct device_attribute *attr, char *buf); | |
628 | extern ssize_t part_fail_store(struct device *dev, | |
629 | struct device_attribute *attr, | |
630 | const char *buf, size_t count); | |
631 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ | |
e5610521 | 632 | |
6c23a968 JA |
633 | static inline void hd_ref_init(struct hd_struct *part) |
634 | { | |
635 | atomic_set(&part->ref, 1); | |
636 | smp_mb(); | |
637 | } | |
638 | ||
639 | static inline void hd_struct_get(struct hd_struct *part) | |
640 | { | |
641 | atomic_inc(&part->ref); | |
642 | smp_mb__after_atomic_inc(); | |
643 | } | |
644 | ||
645 | static inline int hd_struct_try_get(struct hd_struct *part) | |
646 | { | |
647 | return atomic_inc_not_zero(&part->ref); | |
648 | } | |
649 | ||
650 | static inline void hd_struct_put(struct hd_struct *part) | |
651 | { | |
652 | if (atomic_dec_and_test(&part->ref)) | |
653 | __delete_partition(part); | |
654 | } | |
655 | ||
87c1efbf JA |
656 | #else /* CONFIG_BLOCK */ |
657 | ||
658 | static inline void printk_all_partitions(void) { } | |
659 | ||
cf771cb5 | 660 | static inline dev_t blk_lookup_devt(const char *name, int partno) |
edfaa7c3 KS |
661 | { |
662 | dev_t devt = MKDEV(0, 0); | |
663 | return devt; | |
664 | } | |
665 | ||
87c1efbf | 666 | #endif /* CONFIG_BLOCK */ |
9361401e | 667 | |
a8ae50ba | 668 | #endif /* _LINUX_GENHD_H */ |