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