1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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 | |
13 | #include <linux/types.h> |
14 | #include <linux/kdev_t.h> |
15 | #include <linux/rcupdate.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/percpu-refcount.h> |
18 | #include <linux/uuid.h> |
19 | #include <linux/blk_types.h> |
20 | #include <asm/local.h> |
21 | |
22 | #ifdef CONFIG_BLOCK |
23 | |
24 | #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
25 | #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
26 | #define disk_to_dev(disk) (&(disk)->part0.__dev) |
27 | #define part_to_dev(part) (&((part)->__dev)) |
28 | |
29 | extern struct device_type part_type; |
30 | extern struct kobject *block_depr; |
31 | extern struct class block_class; |
32 | |
33 | enum { |
34 | /* These three have identical behaviour; use the second one if DOS FDISK gets |
35 | confused about extended/logical partitions starting past cylinder 1023. */ |
36 | DOS_EXTENDED_PARTITION = 5, |
37 | LINUX_EXTENDED_PARTITION = 0x85, |
38 | WIN98_EXTENDED_PARTITION = 0x0f, |
39 | |
40 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
41 | |
42 | LINUX_SWAP_PARTITION = 0x82, |
43 | LINUX_DATA_PARTITION = 0x83, |
44 | LINUX_LVM_PARTITION = 0x8e, |
45 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
46 | |
47 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, |
48 | NEW_SOLARIS_X86_PARTITION = 0xbf, |
49 | |
50 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ |
51 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ |
52 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ |
53 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ |
54 | |
55 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ |
56 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ |
57 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ |
58 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ |
59 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ |
60 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ |
61 | }; |
62 | |
63 | #define DISK_MAX_PARTS 256 |
64 | #define DISK_NAME_LEN 32 |
65 | |
66 | #include <linux/major.h> |
67 | #include <linux/device.h> |
68 | #include <linux/smp.h> |
69 | #include <linux/string.h> |
70 | #include <linux/fs.h> |
71 | #include <linux/workqueue.h> |
72 | |
73 | struct partition { |
74 | unsigned char boot_ind; /* 0x80 - active */ |
75 | unsigned char head; /* starting head */ |
76 | unsigned char sector; /* starting sector */ |
77 | unsigned char cyl; /* starting cylinder */ |
78 | unsigned char sys_ind; /* What partition type */ |
79 | unsigned char end_head; /* end head */ |
80 | unsigned char end_sector; /* end sector */ |
81 | unsigned char end_cyl; /* end cylinder */ |
82 | __le32 start_sect; /* starting sector counting from 0 */ |
83 | __le32 nr_sects; /* nr of sectors in partition */ |
84 | } __attribute__((packed)); |
85 | |
86 | struct disk_stats { |
87 | u64 nsecs[NR_STAT_GROUPS]; |
88 | unsigned long sectors[NR_STAT_GROUPS]; |
89 | unsigned long ios[NR_STAT_GROUPS]; |
90 | unsigned long merges[NR_STAT_GROUPS]; |
91 | unsigned long io_ticks; |
92 | unsigned long time_in_queue; |
93 | local_t in_flight[2]; |
94 | }; |
95 | |
96 | #define PARTITION_META_INFO_VOLNAMELTH 64 |
97 | /* |
98 | * Enough for the string representation of any kind of UUID plus NULL. |
99 | * EFI UUID is 36 characters. MSDOS UUID is 11 characters. |
100 | */ |
101 | #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) |
102 | |
103 | struct partition_meta_info { |
104 | char uuid[PARTITION_META_INFO_UUIDLTH]; |
105 | u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
106 | }; |
107 | |
108 | struct hd_struct { |
109 | sector_t start_sect; |
110 | /* |
111 | * nr_sects is protected by sequence counter. One might extend a |
112 | * partition while IO is happening to it and update of nr_sects |
113 | * can be non-atomic on 32bit machines with 64bit sector_t. |
114 | */ |
115 | sector_t nr_sects; |
116 | seqcount_t nr_sects_seq; |
117 | sector_t alignment_offset; |
118 | unsigned int discard_alignment; |
119 | struct device __dev; |
120 | struct kobject *holder_dir; |
121 | int policy, partno; |
122 | struct partition_meta_info *info; |
123 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
124 | int make_it_fail; |
125 | #endif |
126 | unsigned long stamp; |
127 | #ifdef CONFIG_SMP |
128 | struct disk_stats __percpu *dkstats; |
129 | #else |
130 | struct disk_stats dkstats; |
131 | #endif |
132 | struct percpu_ref ref; |
133 | struct rcu_work rcu_work; |
134 | }; |
135 | |
136 | #define GENHD_FL_REMOVABLE 1 |
137 | /* 2 is unused */ |
138 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
139 | #define GENHD_FL_CD 8 |
140 | #define GENHD_FL_UP 16 |
141 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 |
142 | #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
143 | #define GENHD_FL_NATIVE_CAPACITY 128 |
144 | #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
145 | #define GENHD_FL_NO_PART_SCAN 512 |
146 | #define GENHD_FL_HIDDEN 1024 |
147 | |
148 | enum { |
149 | DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ |
150 | DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ |
151 | }; |
152 | |
153 | struct disk_part_tbl { |
154 | struct rcu_head rcu_head; |
155 | int len; |
156 | struct hd_struct __rcu *last_lookup; |
157 | struct hd_struct __rcu *part[]; |
158 | }; |
159 | |
160 | struct disk_events; |
161 | struct badblocks; |
162 | |
163 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
164 | |
165 | struct blk_integrity { |
166 | const struct blk_integrity_profile *profile; |
167 | unsigned char flags; |
168 | unsigned char tuple_size; |
169 | unsigned char interval_exp; |
170 | unsigned char tag_size; |
171 | }; |
172 | |
173 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
174 | |
175 | struct gendisk { |
176 | /* major, first_minor and minors are input parameters only, |
177 | * don't use directly. Use disk_devt() and disk_max_parts(). |
178 | */ |
179 | int major; /* major number of driver */ |
180 | int first_minor; |
181 | int minors; /* maximum number of minors, =1 for |
182 | * disks that can't be partitioned. */ |
183 | |
184 | char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
185 | char *(*devnode)(struct gendisk *gd, umode_t *mode); |
186 | |
187 | unsigned int events; /* supported events */ |
188 | unsigned int async_events; /* async events, subset of all */ |
189 | |
190 | /* Array of pointers to partitions indexed by partno. |
191 | * Protected with matching bdev lock but stat and other |
192 | * non-critical accesses use RCU. Always access through |
193 | * helpers. |
194 | */ |
195 | struct disk_part_tbl __rcu *part_tbl; |
196 | struct hd_struct part0; |
197 | |
198 | const struct block_device_operations *fops; |
199 | struct request_queue *queue; |
200 | void *private_data; |
201 | |
202 | int flags; |
203 | struct rw_semaphore lookup_sem; |
204 | struct kobject *slave_dir; |
205 | |
206 | struct timer_rand_state *random; |
207 | atomic_t sync_io; /* RAID */ |
208 | struct disk_events *ev; |
209 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
210 | struct kobject integrity_kobj; |
211 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
212 | int node_id; |
213 | struct badblocks *bb; |
214 | struct lockdep_map lockdep_map; |
215 | }; |
216 | |
217 | static inline struct gendisk *part_to_disk(struct hd_struct *part) |
218 | { |
219 | if (likely(part)) { |
220 | if (part->partno) |
221 | return dev_to_disk(part_to_dev(part)->parent); |
222 | else |
223 | return dev_to_disk(part_to_dev(part)); |
224 | } |
225 | return NULL; |
226 | } |
227 | |
228 | static inline int disk_max_parts(struct gendisk *disk) |
229 | { |
230 | if (disk->flags & GENHD_FL_EXT_DEVT) |
231 | return DISK_MAX_PARTS; |
232 | return disk->minors; |
233 | } |
234 | |
235 | static inline bool disk_part_scan_enabled(struct gendisk *disk) |
236 | { |
237 | return disk_max_parts(disk) > 1 && |
238 | !(disk->flags & GENHD_FL_NO_PART_SCAN); |
239 | } |
240 | |
241 | static inline dev_t disk_devt(struct gendisk *disk) |
242 | { |
243 | return MKDEV(disk->major, disk->first_minor); |
244 | } |
245 | |
246 | static inline dev_t part_devt(struct hd_struct *part) |
247 | { |
248 | return part_to_dev(part)->devt; |
249 | } |
250 | |
251 | extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); |
252 | extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
253 | |
254 | static inline void disk_put_part(struct hd_struct *part) |
255 | { |
256 | if (likely(part)) |
257 | put_device(part_to_dev(part)); |
258 | } |
259 | |
260 | /* |
261 | * Smarter partition iterator without context limits. |
262 | */ |
263 | #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ |
264 | #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ |
265 | #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
266 | #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
267 | |
268 | struct disk_part_iter { |
269 | struct gendisk *disk; |
270 | struct hd_struct *part; |
271 | int idx; |
272 | unsigned int flags; |
273 | }; |
274 | |
275 | extern void disk_part_iter_init(struct disk_part_iter *piter, |
276 | struct gendisk *disk, unsigned int flags); |
277 | extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); |
278 | extern void disk_part_iter_exit(struct disk_part_iter *piter); |
279 | |
280 | extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, |
281 | sector_t sector); |
282 | |
283 | /* |
284 | * Macros to operate on percpu disk statistics: |
285 | * |
286 | * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
287 | * and should be called between disk_stat_lock() and |
288 | * disk_stat_unlock(). |
289 | * |
290 | * part_stat_read() can be called at any time. |
291 | * |
292 | * part_stat_{add|set_all}() and {init|free}_part_stats are for |
293 | * internal use only. |
294 | */ |
295 | #ifdef CONFIG_SMP |
296 | #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
297 | #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) |
298 | |
299 | #define part_stat_get_cpu(part, field, cpu) \ |
300 | (per_cpu_ptr((part)->dkstats, (cpu))->field) |
301 | |
302 | #define part_stat_get(part, field) \ |
303 | part_stat_get_cpu(part, field, smp_processor_id()) |
304 | |
305 | #define part_stat_read(part, field) \ |
306 | ({ \ |
307 | typeof((part)->dkstats->field) res = 0; \ |
308 | unsigned int _cpu; \ |
309 | for_each_possible_cpu(_cpu) \ |
310 | res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ |
311 | res; \ |
312 | }) |
313 | |
314 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
315 | { |
316 | int i; |
317 | |
318 | for_each_possible_cpu(i) |
319 | memset(per_cpu_ptr(part->dkstats, i), value, |
320 | sizeof(struct disk_stats)); |
321 | } |
322 | |
323 | static inline int init_part_stats(struct hd_struct *part) |
324 | { |
325 | part->dkstats = alloc_percpu(struct disk_stats); |
326 | if (!part->dkstats) |
327 | return 0; |
328 | return 1; |
329 | } |
330 | |
331 | static inline void free_part_stats(struct hd_struct *part) |
332 | { |
333 | free_percpu(part->dkstats); |
334 | } |
335 | |
336 | #else /* !CONFIG_SMP */ |
337 | #define part_stat_lock() ({ rcu_read_lock(); 0; }) |
338 | #define part_stat_unlock() rcu_read_unlock() |
339 | |
340 | #define part_stat_get(part, field) ((part)->dkstats.field) |
341 | #define part_stat_get_cpu(part, field, cpu) part_stat_get(part, field) |
342 | #define part_stat_read(part, field) part_stat_get(part, field) |
343 | |
344 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
345 | { |
346 | memset(&part->dkstats, value, sizeof(struct disk_stats)); |
347 | } |
348 | |
349 | static inline int init_part_stats(struct hd_struct *part) |
350 | { |
351 | return 1; |
352 | } |
353 | |
354 | static inline void free_part_stats(struct hd_struct *part) |
355 | { |
356 | } |
357 | |
358 | #endif /* CONFIG_SMP */ |
359 | |
360 | #define part_stat_read_msecs(part, which) \ |
361 | div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC) |
362 | |
363 | #define part_stat_read_accum(part, field) \ |
364 | (part_stat_read(part, field[STAT_READ]) + \ |
365 | part_stat_read(part, field[STAT_WRITE]) + \ |
366 | part_stat_read(part, field[STAT_DISCARD])) |
367 | |
368 | #define __part_stat_add(part, field, addnd) \ |
369 | (part_stat_get(part, field) += (addnd)) |
370 | |
371 | #define part_stat_add(part, field, addnd) do { \ |
372 | __part_stat_add((part), field, addnd); \ |
373 | if ((part)->partno) \ |
374 | __part_stat_add(&part_to_disk((part))->part0, \ |
375 | field, addnd); \ |
376 | } while (0) |
377 | |
378 | #define part_stat_dec(gendiskp, field) \ |
379 | part_stat_add(gendiskp, field, -1) |
380 | #define part_stat_inc(gendiskp, field) \ |
381 | part_stat_add(gendiskp, field, 1) |
382 | #define part_stat_sub(gendiskp, field, subnd) \ |
383 | part_stat_add(gendiskp, field, -subnd) |
384 | |
385 | #define part_stat_local_dec(gendiskp, field) \ |
386 | local_dec(&(part_stat_get(gendiskp, field))) |
387 | #define part_stat_local_inc(gendiskp, field) \ |
388 | local_inc(&(part_stat_get(gendiskp, field))) |
389 | #define part_stat_local_read(gendiskp, field) \ |
390 | local_read(&(part_stat_get(gendiskp, field))) |
391 | #define part_stat_local_read_cpu(gendiskp, field, cpu) \ |
392 | local_read(&(part_stat_get_cpu(gendiskp, field, cpu))) |
393 | |
394 | unsigned int part_in_flight(struct request_queue *q, struct hd_struct *part); |
395 | void part_in_flight_rw(struct request_queue *q, struct hd_struct *part, |
396 | unsigned int inflight[2]); |
397 | void part_dec_in_flight(struct request_queue *q, struct hd_struct *part, |
398 | int rw); |
399 | void part_inc_in_flight(struct request_queue *q, struct hd_struct *part, |
400 | int rw); |
401 | |
402 | static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
403 | { |
404 | if (disk) |
405 | return kzalloc_node(sizeof(struct partition_meta_info), |
406 | GFP_KERNEL, disk->node_id); |
407 | return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); |
408 | } |
409 | |
410 | static inline void free_part_info(struct hd_struct *part) |
411 | { |
412 | kfree(part->info); |
413 | } |
414 | |
415 | void update_io_ticks(struct hd_struct *part, unsigned long now); |
416 | |
417 | /* block/genhd.c */ |
418 | extern void device_add_disk(struct device *parent, struct gendisk *disk, |
419 | const struct attribute_group **groups); |
420 | static inline void add_disk(struct gendisk *disk) |
421 | { |
422 | device_add_disk(NULL, disk, NULL); |
423 | } |
424 | extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk); |
425 | static inline void add_disk_no_queue_reg(struct gendisk *disk) |
426 | { |
427 | device_add_disk_no_queue_reg(NULL, disk); |
428 | } |
429 | |
430 | extern void del_gendisk(struct gendisk *gp); |
431 | extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
432 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
433 | |
434 | extern void set_device_ro(struct block_device *bdev, int flag); |
435 | extern void set_disk_ro(struct gendisk *disk, int flag); |
436 | |
437 | static inline int get_disk_ro(struct gendisk *disk) |
438 | { |
439 | return disk->part0.policy; |
440 | } |
441 | |
442 | extern void disk_block_events(struct gendisk *disk); |
443 | extern void disk_unblock_events(struct gendisk *disk); |
444 | extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
445 | extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
446 | |
447 | /* drivers/char/random.c */ |
448 | extern void add_disk_randomness(struct gendisk *disk) __latent_entropy; |
449 | extern void rand_initialize_disk(struct gendisk *disk); |
450 | |
451 | static inline sector_t get_start_sect(struct block_device *bdev) |
452 | { |
453 | return bdev->bd_part->start_sect; |
454 | } |
455 | static inline sector_t get_capacity(struct gendisk *disk) |
456 | { |
457 | return disk->part0.nr_sects; |
458 | } |
459 | static inline void set_capacity(struct gendisk *disk, sector_t size) |
460 | { |
461 | disk->part0.nr_sects = size; |
462 | } |
463 | |
464 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
465 | |
466 | #define SOLARIS_X86_NUMSLICE 16 |
467 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
468 | |
469 | struct solaris_x86_slice { |
470 | __le16 s_tag; /* ID tag of partition */ |
471 | __le16 s_flag; /* permission flags */ |
472 | __le32 s_start; /* start sector no of partition */ |
473 | __le32 s_size; /* # of blocks in partition */ |
474 | }; |
475 | |
476 | struct solaris_x86_vtoc { |
477 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ |
478 | __le32 v_sanity; /* to verify vtoc sanity */ |
479 | __le32 v_version; /* layout version */ |
480 | char v_volume[8]; /* volume name */ |
481 | __le16 v_sectorsz; /* sector size in bytes */ |
482 | __le16 v_nparts; /* number of partitions */ |
483 | unsigned int v_reserved[10]; /* free space */ |
484 | struct solaris_x86_slice |
485 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ |
486 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ |
487 | char v_asciilabel[128]; /* for compatibility */ |
488 | }; |
489 | |
490 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ |
491 | |
492 | #ifdef CONFIG_BSD_DISKLABEL |
493 | /* |
494 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> |
495 | * updated by Marc Espie <Marc.Espie@openbsd.org> |
496 | */ |
497 | |
498 | /* check against BSD src/sys/sys/disklabel.h for consistency */ |
499 | |
500 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ |
501 | #define BSD_MAXPARTITIONS 16 |
502 | #define OPENBSD_MAXPARTITIONS 16 |
503 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ |
504 | struct bsd_disklabel { |
505 | __le32 d_magic; /* the magic number */ |
506 | __s16 d_type; /* drive type */ |
507 | __s16 d_subtype; /* controller/d_type specific */ |
508 | char d_typename[16]; /* type name, e.g. "eagle" */ |
509 | char d_packname[16]; /* pack identifier */ |
510 | __u32 d_secsize; /* # of bytes per sector */ |
511 | __u32 d_nsectors; /* # of data sectors per track */ |
512 | __u32 d_ntracks; /* # of tracks per cylinder */ |
513 | __u32 d_ncylinders; /* # of data cylinders per unit */ |
514 | __u32 d_secpercyl; /* # of data sectors per cylinder */ |
515 | __u32 d_secperunit; /* # of data sectors per unit */ |
516 | __u16 d_sparespertrack; /* # of spare sectors per track */ |
517 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ |
518 | __u32 d_acylinders; /* # of alt. cylinders per unit */ |
519 | __u16 d_rpm; /* rotational speed */ |
520 | __u16 d_interleave; /* hardware sector interleave */ |
521 | __u16 d_trackskew; /* sector 0 skew, per track */ |
522 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ |
523 | __u32 d_headswitch; /* head switch time, usec */ |
524 | __u32 d_trkseek; /* track-to-track seek, usec */ |
525 | __u32 d_flags; /* generic flags */ |
526 | #define NDDATA 5 |
527 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ |
528 | #define NSPARE 5 |
529 | __u32 d_spare[NSPARE]; /* reserved for future use */ |
530 | __le32 d_magic2; /* the magic number (again) */ |
531 | __le16 d_checksum; /* xor of data incl. partitions */ |
532 | |
533 | /* filesystem and partition information: */ |
534 | __le16 d_npartitions; /* number of partitions in following */ |
535 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ |
536 | __le32 d_sbsize; /* max size of fs superblock, bytes */ |
537 | struct bsd_partition { /* the partition table */ |
538 | __le32 p_size; /* number of sectors in partition */ |
539 | __le32 p_offset; /* starting sector */ |
540 | __le32 p_fsize; /* filesystem basic fragment size */ |
541 | __u8 p_fstype; /* filesystem type, see below */ |
542 | __u8 p_frag; /* filesystem fragments per block */ |
543 | __le16 p_cpg; /* filesystem cylinders per group */ |
544 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ |
545 | }; |
546 | |
547 | #endif /* CONFIG_BSD_DISKLABEL */ |
548 | |
549 | #ifdef CONFIG_UNIXWARE_DISKLABEL |
550 | /* |
551 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> |
552 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> |
553 | */ |
554 | |
555 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ |
556 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ |
557 | #define UNIXWARE_NUMSLICE 16 |
558 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ |
559 | |
560 | struct unixware_slice { |
561 | __le16 s_label; /* label */ |
562 | __le16 s_flags; /* permission flags */ |
563 | __le32 start_sect; /* starting sector */ |
564 | __le32 nr_sects; /* number of sectors in slice */ |
565 | }; |
566 | |
567 | struct unixware_disklabel { |
568 | __le32 d_type; /* drive type */ |
569 | __le32 d_magic; /* the magic number */ |
570 | __le32 d_version; /* version number */ |
571 | char d_serial[12]; /* serial number of the device */ |
572 | __le32 d_ncylinders; /* # of data cylinders per device */ |
573 | __le32 d_ntracks; /* # of tracks per cylinder */ |
574 | __le32 d_nsectors; /* # of data sectors per track */ |
575 | __le32 d_secsize; /* # of bytes per sector */ |
576 | __le32 d_part_start; /* # of first sector of this partition */ |
577 | __le32 d_unknown1[12]; /* ? */ |
578 | __le32 d_alt_tbl; /* byte offset of alternate table */ |
579 | __le32 d_alt_len; /* byte length of alternate table */ |
580 | __le32 d_phys_cyl; /* # of physical cylinders per device */ |
581 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ |
582 | __le32 d_phys_sec; /* # of physical sectors per track */ |
583 | __le32 d_phys_bytes; /* # of physical bytes per sector */ |
584 | __le32 d_unknown2; /* ? */ |
585 | __le32 d_unknown3; /* ? */ |
586 | __le32 d_pad[8]; /* pad */ |
587 | |
588 | struct unixware_vtoc { |
589 | __le32 v_magic; /* the magic number */ |
590 | __le32 v_version; /* version number */ |
591 | char v_name[8]; /* volume name */ |
592 | __le16 v_nslices; /* # of slices */ |
593 | __le16 v_unknown1; /* ? */ |
594 | __le32 v_reserved[10]; /* reserved */ |
595 | struct unixware_slice |
596 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ |
597 | } vtoc; |
598 | |
599 | }; /* 408 */ |
600 | |
601 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ |
602 | |
603 | #ifdef CONFIG_MINIX_SUBPARTITION |
604 | # define MINIX_NR_SUBPARTITIONS 4 |
605 | #endif /* CONFIG_MINIX_SUBPARTITION */ |
606 | |
607 | #define ADDPART_FLAG_NONE 0 |
608 | #define ADDPART_FLAG_RAID 1 |
609 | #define ADDPART_FLAG_WHOLEDISK 2 |
610 | |
611 | extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
612 | extern void blk_free_devt(dev_t devt); |
613 | extern dev_t blk_lookup_devt(const char *name, int partno); |
614 | extern char *disk_name (struct gendisk *hd, int partno, char *buf); |
615 | |
616 | extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
617 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
618 | extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); |
619 | extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
620 | int partno, sector_t start, |
621 | sector_t len, int flags, |
622 | struct partition_meta_info |
623 | *info); |
624 | extern void __delete_partition(struct percpu_ref *); |
625 | extern void delete_partition(struct gendisk *, int); |
626 | extern void printk_all_partitions(void); |
627 | |
628 | extern struct gendisk *__alloc_disk_node(int minors, int node_id); |
629 | extern struct kobject *get_disk_and_module(struct gendisk *disk); |
630 | extern void put_disk(struct gendisk *disk); |
631 | extern void put_disk_and_module(struct gendisk *disk); |
632 | extern void blk_register_region(dev_t devt, unsigned long range, |
633 | struct module *module, |
634 | struct kobject *(*probe)(dev_t, int *, void *), |
635 | int (*lock)(dev_t, void *), |
636 | void *data); |
637 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
638 | |
639 | extern ssize_t part_size_show(struct device *dev, |
640 | struct device_attribute *attr, char *buf); |
641 | extern ssize_t part_stat_show(struct device *dev, |
642 | struct device_attribute *attr, char *buf); |
643 | extern ssize_t part_inflight_show(struct device *dev, |
644 | struct device_attribute *attr, char *buf); |
645 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
646 | extern ssize_t part_fail_show(struct device *dev, |
647 | struct device_attribute *attr, char *buf); |
648 | extern ssize_t part_fail_store(struct device *dev, |
649 | struct device_attribute *attr, |
650 | const char *buf, size_t count); |
651 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
652 | |
653 | #define alloc_disk_node(minors, node_id) \ |
654 | ({ \ |
655 | static struct lock_class_key __key; \ |
656 | const char *__name; \ |
657 | struct gendisk *__disk; \ |
658 | \ |
659 | __name = "(gendisk_completion)"#minors"("#node_id")"; \ |
660 | \ |
661 | __disk = __alloc_disk_node(minors, node_id); \ |
662 | \ |
663 | if (__disk) \ |
664 | lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \ |
665 | \ |
666 | __disk; \ |
667 | }) |
668 | |
669 | #define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE) |
670 | |
671 | static inline int hd_ref_init(struct hd_struct *part) |
672 | { |
673 | if (percpu_ref_init(&part->ref, __delete_partition, 0, |
674 | GFP_KERNEL)) |
675 | return -ENOMEM; |
676 | return 0; |
677 | } |
678 | |
679 | static inline void hd_struct_get(struct hd_struct *part) |
680 | { |
681 | percpu_ref_get(&part->ref); |
682 | } |
683 | |
684 | static inline int hd_struct_try_get(struct hd_struct *part) |
685 | { |
686 | return percpu_ref_tryget_live(&part->ref); |
687 | } |
688 | |
689 | static inline void hd_struct_put(struct hd_struct *part) |
690 | { |
691 | percpu_ref_put(&part->ref); |
692 | } |
693 | |
694 | static inline void hd_struct_kill(struct hd_struct *part) |
695 | { |
696 | percpu_ref_kill(&part->ref); |
697 | } |
698 | |
699 | static inline void hd_free_part(struct hd_struct *part) |
700 | { |
701 | free_part_stats(part); |
702 | free_part_info(part); |
703 | percpu_ref_exit(&part->ref); |
704 | } |
705 | |
706 | /* |
707 | * Any access of part->nr_sects which is not protected by partition |
708 | * bd_mutex or gendisk bdev bd_mutex, should be done using this |
709 | * accessor function. |
710 | * |
711 | * Code written along the lines of i_size_read() and i_size_write(). |
712 | * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption |
713 | * on. |
714 | */ |
715 | static inline sector_t part_nr_sects_read(struct hd_struct *part) |
716 | { |
717 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) |
718 | sector_t nr_sects; |
719 | unsigned seq; |
720 | do { |
721 | seq = read_seqcount_begin(&part->nr_sects_seq); |
722 | nr_sects = part->nr_sects; |
723 | } while (read_seqcount_retry(&part->nr_sects_seq, seq)); |
724 | return nr_sects; |
725 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) |
726 | sector_t nr_sects; |
727 | |
728 | preempt_disable(); |
729 | nr_sects = part->nr_sects; |
730 | preempt_enable(); |
731 | return nr_sects; |
732 | #else |
733 | return part->nr_sects; |
734 | #endif |
735 | } |
736 | |
737 | /* |
738 | * Should be called with mutex lock held (typically bd_mutex) of partition |
739 | * to provide mutual exlusion among writers otherwise seqcount might be |
740 | * left in wrong state leaving the readers spinning infinitely. |
741 | */ |
742 | static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) |
743 | { |
744 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) |
745 | write_seqcount_begin(&part->nr_sects_seq); |
746 | part->nr_sects = size; |
747 | write_seqcount_end(&part->nr_sects_seq); |
748 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) |
749 | preempt_disable(); |
750 | part->nr_sects = size; |
751 | preempt_enable(); |
752 | #else |
753 | part->nr_sects = size; |
754 | #endif |
755 | } |
756 | |
757 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
758 | extern void blk_integrity_add(struct gendisk *); |
759 | extern void blk_integrity_del(struct gendisk *); |
760 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
761 | static inline void blk_integrity_add(struct gendisk *disk) { } |
762 | static inline void blk_integrity_del(struct gendisk *disk) { } |
763 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
764 | |
765 | #else /* CONFIG_BLOCK */ |
766 | |
767 | static inline void printk_all_partitions(void) { } |
768 | |
769 | static inline dev_t blk_lookup_devt(const char *name, int partno) |
770 | { |
771 | dev_t devt = MKDEV(0, 0); |
772 | return devt; |
773 | } |
774 | #endif /* CONFIG_BLOCK */ |
775 | |
776 | #endif /* _LINUX_GENHD_H */ |
777 | |