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 #include <linux/percpu-refcount.h>
17
18 #ifdef CONFIG_BLOCK
19
20 #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
21 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
22 #define disk_to_dev(disk) (&(disk)->part0.__dev)
23 #define part_to_dev(part) (&((part)->__dev))
24
25 extern struct device_type part_type;
26 extern struct kobject *block_depr;
27 extern struct class block_class;
28
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
36 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
37
38 LINUX_SWAP_PARTITION = 0x82,
39 LINUX_DATA_PARTITION = 0x83,
40 LINUX_LVM_PARTITION = 0x8e,
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
59 #define DISK_MAX_PARTS 256
60 #define DISK_NAME_LEN 32
61
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>
67 #include <linux/workqueue.h>
68
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
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 };
90
91 #define PARTITION_META_INFO_VOLNAMELTH 64
92 /*
93 * Enough for the string representation of any kind of UUID plus NULL.
94 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
95 */
96 #define PARTITION_META_INFO_UUIDLTH 37
97
98 struct partition_meta_info {
99 char uuid[PARTITION_META_INFO_UUIDLTH];
100 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
101 };
102
103 struct hd_struct {
104 sector_t start_sect;
105 /*
106 * nr_sects is protected by sequence counter. One might extend a
107 * partition while IO is happening to it and update of nr_sects
108 * can be non-atomic on 32bit machines with 64bit sector_t.
109 */
110 sector_t nr_sects;
111 seqcount_t nr_sects_seq;
112 sector_t alignment_offset;
113 unsigned int discard_alignment;
114 struct device __dev;
115 struct kobject *holder_dir;
116 int policy, partno;
117 struct partition_meta_info *info;
118 #ifdef CONFIG_FAIL_MAKE_REQUEST
119 int make_it_fail;
120 #endif
121 unsigned long stamp;
122 atomic_t in_flight[2];
123 #ifdef CONFIG_SMP
124 struct disk_stats __percpu *dkstats;
125 #else
126 struct disk_stats dkstats;
127 #endif
128 struct percpu_ref ref;
129 struct rcu_head rcu_head;
130 };
131
132 #define GENHD_FL_REMOVABLE 1
133 /* 2 is unused */
134 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
135 #define GENHD_FL_CD 8
136 #define GENHD_FL_UP 16
137 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
138 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
139 #define GENHD_FL_NATIVE_CAPACITY 128
140 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
141 #define GENHD_FL_NO_PART_SCAN 512
142
143 enum {
144 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
145 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
146 };
147
148 #define BLK_SCSI_MAX_CMDS (256)
149 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
150
151 struct blk_scsi_cmd_filter {
152 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
153 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
154 struct kobject kobj;
155 };
156
157 struct disk_part_tbl {
158 struct rcu_head rcu_head;
159 int len;
160 struct hd_struct __rcu *last_lookup;
161 struct hd_struct __rcu *part[];
162 };
163
164 struct disk_events;
165
166 #if defined(CONFIG_BLK_DEV_INTEGRITY)
167
168 struct blk_integrity {
169 struct blk_integrity_profile *profile;
170 unsigned char flags;
171 unsigned char tuple_size;
172 unsigned char interval_exp;
173 unsigned char tag_size;
174 };
175
176 #endif /* CONFIG_BLK_DEV_INTEGRITY */
177
178 struct gendisk {
179 /* major, first_minor and minors are input parameters only,
180 * don't use directly. Use disk_devt() and disk_max_parts().
181 */
182 int major; /* major number of driver */
183 int first_minor;
184 int minors; /* maximum number of minors, =1 for
185 * disks that can't be partitioned. */
186
187 char disk_name[DISK_NAME_LEN]; /* name of major driver */
188 char *(*devnode)(struct gendisk *gd, umode_t *mode);
189
190 unsigned int events; /* supported events */
191 unsigned int async_events; /* async events, subset of all */
192
193 /* Array of pointers to partitions indexed by partno.
194 * Protected with matching bdev lock but stat and other
195 * non-critical accesses use RCU. Always access through
196 * helpers.
197 */
198 struct disk_part_tbl __rcu *part_tbl;
199 struct hd_struct part0;
200
201 const struct block_device_operations *fops;
202 struct request_queue *queue;
203 void *private_data;
204
205 int flags;
206 struct device *driverfs_dev; // FIXME: remove
207 struct kobject *slave_dir;
208
209 struct timer_rand_state *random;
210 atomic_t sync_io; /* RAID */
211 struct disk_events *ev;
212 #ifdef CONFIG_BLK_DEV_INTEGRITY
213 struct kobject integrity_kobj;
214 #endif /* CONFIG_BLK_DEV_INTEGRITY */
215 int node_id;
216 };
217
part_to_disk(struct hd_struct * part)218 static inline struct gendisk *part_to_disk(struct hd_struct *part)
219 {
220 if (likely(part)) {
221 if (part->partno)
222 return dev_to_disk(part_to_dev(part)->parent);
223 else
224 return dev_to_disk(part_to_dev(part));
225 }
226 return NULL;
227 }
228
part_pack_uuid(const u8 * uuid_str,u8 * to)229 static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
230 {
231 int i;
232 for (i = 0; i < 16; ++i) {
233 *to++ = (hex_to_bin(*uuid_str) << 4) |
234 (hex_to_bin(*(uuid_str + 1)));
235 uuid_str += 2;
236 switch (i) {
237 case 3:
238 case 5:
239 case 7:
240 case 9:
241 uuid_str++;
242 continue;
243 }
244 }
245 }
246
blk_part_pack_uuid(const u8 * uuid_str,u8 * to)247 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
248 {
249 part_pack_uuid(uuid_str, to);
250 return 0;
251 }
252
disk_max_parts(struct gendisk * disk)253 static inline int disk_max_parts(struct gendisk *disk)
254 {
255 if (disk->flags & GENHD_FL_EXT_DEVT)
256 return DISK_MAX_PARTS;
257 return disk->minors;
258 }
259
disk_part_scan_enabled(struct gendisk * disk)260 static inline bool disk_part_scan_enabled(struct gendisk *disk)
261 {
262 return disk_max_parts(disk) > 1 &&
263 !(disk->flags & GENHD_FL_NO_PART_SCAN);
264 }
265
disk_devt(struct gendisk * disk)266 static inline dev_t disk_devt(struct gendisk *disk)
267 {
268 return disk_to_dev(disk)->devt;
269 }
270
part_devt(struct hd_struct * part)271 static inline dev_t part_devt(struct hd_struct *part)
272 {
273 return part_to_dev(part)->devt;
274 }
275
276 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
277
disk_put_part(struct hd_struct * part)278 static inline void disk_put_part(struct hd_struct *part)
279 {
280 if (likely(part))
281 put_device(part_to_dev(part));
282 }
283
284 /*
285 * Smarter partition iterator without context limits.
286 */
287 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
288 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
289 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
290 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
291
292 struct disk_part_iter {
293 struct gendisk *disk;
294 struct hd_struct *part;
295 int idx;
296 unsigned int flags;
297 };
298
299 extern void disk_part_iter_init(struct disk_part_iter *piter,
300 struct gendisk *disk, unsigned int flags);
301 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
302 extern void disk_part_iter_exit(struct disk_part_iter *piter);
303
304 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
305 sector_t sector);
306
307 /*
308 * Macros to operate on percpu disk statistics:
309 *
310 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
311 * and should be called between disk_stat_lock() and
312 * disk_stat_unlock().
313 *
314 * part_stat_read() can be called at any time.
315 *
316 * part_stat_{add|set_all}() and {init|free}_part_stats are for
317 * internal use only.
318 */
319 #ifdef CONFIG_SMP
320 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
321 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
322
323 #define __part_stat_add(cpu, part, field, addnd) \
324 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
325
326 #define part_stat_read(part, field) \
327 ({ \
328 typeof((part)->dkstats->field) res = 0; \
329 unsigned int _cpu; \
330 for_each_possible_cpu(_cpu) \
331 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
332 res; \
333 })
334
part_stat_set_all(struct hd_struct * part,int value)335 static inline void part_stat_set_all(struct hd_struct *part, int value)
336 {
337 int i;
338
339 for_each_possible_cpu(i)
340 memset(per_cpu_ptr(part->dkstats, i), value,
341 sizeof(struct disk_stats));
342 }
343
init_part_stats(struct hd_struct * part)344 static inline int init_part_stats(struct hd_struct *part)
345 {
346 part->dkstats = alloc_percpu(struct disk_stats);
347 if (!part->dkstats)
348 return 0;
349 return 1;
350 }
351
free_part_stats(struct hd_struct * part)352 static inline void free_part_stats(struct hd_struct *part)
353 {
354 free_percpu(part->dkstats);
355 }
356
357 #else /* !CONFIG_SMP */
358 #define part_stat_lock() ({ rcu_read_lock(); 0; })
359 #define part_stat_unlock() rcu_read_unlock()
360
361 #define __part_stat_add(cpu, part, field, addnd) \
362 ((part)->dkstats.field += addnd)
363
364 #define part_stat_read(part, field) ((part)->dkstats.field)
365
part_stat_set_all(struct hd_struct * part,int value)366 static inline void part_stat_set_all(struct hd_struct *part, int value)
367 {
368 memset(&part->dkstats, value, sizeof(struct disk_stats));
369 }
370
init_part_stats(struct hd_struct * part)371 static inline int init_part_stats(struct hd_struct *part)
372 {
373 return 1;
374 }
375
free_part_stats(struct hd_struct * part)376 static inline void free_part_stats(struct hd_struct *part)
377 {
378 }
379
380 #endif /* CONFIG_SMP */
381
382 #define part_stat_add(cpu, part, field, addnd) do { \
383 __part_stat_add((cpu), (part), field, addnd); \
384 if ((part)->partno) \
385 __part_stat_add((cpu), &part_to_disk((part))->part0, \
386 field, addnd); \
387 } while (0)
388
389 #define part_stat_dec(cpu, gendiskp, field) \
390 part_stat_add(cpu, gendiskp, field, -1)
391 #define part_stat_inc(cpu, gendiskp, field) \
392 part_stat_add(cpu, gendiskp, field, 1)
393 #define part_stat_sub(cpu, gendiskp, field, subnd) \
394 part_stat_add(cpu, gendiskp, field, -subnd)
395
part_inc_in_flight(struct hd_struct * part,int rw)396 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
397 {
398 atomic_inc(&part->in_flight[rw]);
399 if (part->partno)
400 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
401 }
402
part_dec_in_flight(struct hd_struct * part,int rw)403 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
404 {
405 atomic_dec(&part->in_flight[rw]);
406 if (part->partno)
407 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
408 }
409
part_in_flight(struct hd_struct * part)410 static inline int part_in_flight(struct hd_struct *part)
411 {
412 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
413 }
414
alloc_part_info(struct gendisk * disk)415 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
416 {
417 if (disk)
418 return kzalloc_node(sizeof(struct partition_meta_info),
419 GFP_KERNEL, disk->node_id);
420 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
421 }
422
free_part_info(struct hd_struct * part)423 static inline void free_part_info(struct hd_struct *part)
424 {
425 kfree(part->info);
426 }
427
428 /* block/blk-core.c */
429 extern void part_round_stats(int cpu, struct hd_struct *part);
430
431 /* block/genhd.c */
432 extern void add_disk(struct gendisk *disk);
433 extern void del_gendisk(struct gendisk *gp);
434 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
435 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
436
437 extern void set_device_ro(struct block_device *bdev, int flag);
438 extern void set_disk_ro(struct gendisk *disk, int flag);
439
get_disk_ro(struct gendisk * disk)440 static inline int get_disk_ro(struct gendisk *disk)
441 {
442 return disk->part0.policy;
443 }
444
445 extern void disk_block_events(struct gendisk *disk);
446 extern void disk_unblock_events(struct gendisk *disk);
447 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
448 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
449
450 /* drivers/char/random.c */
451 extern void add_disk_randomness(struct gendisk *disk);
452 extern void rand_initialize_disk(struct gendisk *disk);
453
get_start_sect(struct block_device * bdev)454 static inline sector_t get_start_sect(struct block_device *bdev)
455 {
456 return bdev->bd_part->start_sect;
457 }
get_capacity(struct gendisk * disk)458 static inline sector_t get_capacity(struct gendisk *disk)
459 {
460 return disk->part0.nr_sects;
461 }
set_capacity(struct gendisk * disk,sector_t size)462 static inline void set_capacity(struct gendisk *disk, sector_t size)
463 {
464 disk->part0.nr_sects = size;
465 }
466
467 #ifdef CONFIG_SOLARIS_X86_PARTITION
468
469 #define SOLARIS_X86_NUMSLICE 16
470 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
471
472 struct solaris_x86_slice {
473 __le16 s_tag; /* ID tag of partition */
474 __le16 s_flag; /* permission flags */
475 __le32 s_start; /* start sector no of partition */
476 __le32 s_size; /* # of blocks in partition */
477 };
478
479 struct solaris_x86_vtoc {
480 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
481 __le32 v_sanity; /* to verify vtoc sanity */
482 __le32 v_version; /* layout version */
483 char v_volume[8]; /* volume name */
484 __le16 v_sectorsz; /* sector size in bytes */
485 __le16 v_nparts; /* number of partitions */
486 unsigned int v_reserved[10]; /* free space */
487 struct solaris_x86_slice
488 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
489 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
490 char v_asciilabel[128]; /* for compatibility */
491 };
492
493 #endif /* CONFIG_SOLARIS_X86_PARTITION */
494
495 #ifdef CONFIG_BSD_DISKLABEL
496 /*
497 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
498 * updated by Marc Espie <Marc.Espie@openbsd.org>
499 */
500
501 /* check against BSD src/sys/sys/disklabel.h for consistency */
502
503 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
504 #define BSD_MAXPARTITIONS 16
505 #define OPENBSD_MAXPARTITIONS 16
506 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
507 struct bsd_disklabel {
508 __le32 d_magic; /* the magic number */
509 __s16 d_type; /* drive type */
510 __s16 d_subtype; /* controller/d_type specific */
511 char d_typename[16]; /* type name, e.g. "eagle" */
512 char d_packname[16]; /* pack identifier */
513 __u32 d_secsize; /* # of bytes per sector */
514 __u32 d_nsectors; /* # of data sectors per track */
515 __u32 d_ntracks; /* # of tracks per cylinder */
516 __u32 d_ncylinders; /* # of data cylinders per unit */
517 __u32 d_secpercyl; /* # of data sectors per cylinder */
518 __u32 d_secperunit; /* # of data sectors per unit */
519 __u16 d_sparespertrack; /* # of spare sectors per track */
520 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
521 __u32 d_acylinders; /* # of alt. cylinders per unit */
522 __u16 d_rpm; /* rotational speed */
523 __u16 d_interleave; /* hardware sector interleave */
524 __u16 d_trackskew; /* sector 0 skew, per track */
525 __u16 d_cylskew; /* sector 0 skew, per cylinder */
526 __u32 d_headswitch; /* head switch time, usec */
527 __u32 d_trkseek; /* track-to-track seek, usec */
528 __u32 d_flags; /* generic flags */
529 #define NDDATA 5
530 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
531 #define NSPARE 5
532 __u32 d_spare[NSPARE]; /* reserved for future use */
533 __le32 d_magic2; /* the magic number (again) */
534 __le16 d_checksum; /* xor of data incl. partitions */
535
536 /* filesystem and partition information: */
537 __le16 d_npartitions; /* number of partitions in following */
538 __le32 d_bbsize; /* size of boot area at sn0, bytes */
539 __le32 d_sbsize; /* max size of fs superblock, bytes */
540 struct bsd_partition { /* the partition table */
541 __le32 p_size; /* number of sectors in partition */
542 __le32 p_offset; /* starting sector */
543 __le32 p_fsize; /* filesystem basic fragment size */
544 __u8 p_fstype; /* filesystem type, see below */
545 __u8 p_frag; /* filesystem fragments per block */
546 __le16 p_cpg; /* filesystem cylinders per group */
547 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
548 };
549
550 #endif /* CONFIG_BSD_DISKLABEL */
551
552 #ifdef CONFIG_UNIXWARE_DISKLABEL
553 /*
554 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
555 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
556 */
557
558 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
559 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
560 #define UNIXWARE_NUMSLICE 16
561 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
562
563 struct unixware_slice {
564 __le16 s_label; /* label */
565 __le16 s_flags; /* permission flags */
566 __le32 start_sect; /* starting sector */
567 __le32 nr_sects; /* number of sectors in slice */
568 };
569
570 struct unixware_disklabel {
571 __le32 d_type; /* drive type */
572 __le32 d_magic; /* the magic number */
573 __le32 d_version; /* version number */
574 char d_serial[12]; /* serial number of the device */
575 __le32 d_ncylinders; /* # of data cylinders per device */
576 __le32 d_ntracks; /* # of tracks per cylinder */
577 __le32 d_nsectors; /* # of data sectors per track */
578 __le32 d_secsize; /* # of bytes per sector */
579 __le32 d_part_start; /* # of first sector of this partition */
580 __le32 d_unknown1[12]; /* ? */
581 __le32 d_alt_tbl; /* byte offset of alternate table */
582 __le32 d_alt_len; /* byte length of alternate table */
583 __le32 d_phys_cyl; /* # of physical cylinders per device */
584 __le32 d_phys_trk; /* # of physical tracks per cylinder */
585 __le32 d_phys_sec; /* # of physical sectors per track */
586 __le32 d_phys_bytes; /* # of physical bytes per sector */
587 __le32 d_unknown2; /* ? */
588 __le32 d_unknown3; /* ? */
589 __le32 d_pad[8]; /* pad */
590
591 struct unixware_vtoc {
592 __le32 v_magic; /* the magic number */
593 __le32 v_version; /* version number */
594 char v_name[8]; /* volume name */
595 __le16 v_nslices; /* # of slices */
596 __le16 v_unknown1; /* ? */
597 __le32 v_reserved[10]; /* reserved */
598 struct unixware_slice
599 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
600 } vtoc;
601
602 }; /* 408 */
603
604 #endif /* CONFIG_UNIXWARE_DISKLABEL */
605
606 #ifdef CONFIG_MINIX_SUBPARTITION
607 # define MINIX_NR_SUBPARTITIONS 4
608 #endif /* CONFIG_MINIX_SUBPARTITION */
609
610 #define ADDPART_FLAG_NONE 0
611 #define ADDPART_FLAG_RAID 1
612 #define ADDPART_FLAG_WHOLEDISK 2
613
614 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
615 extern void blk_free_devt(dev_t devt);
616 extern dev_t blk_lookup_devt(const char *name, int partno);
617 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
618
619 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
620 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
621 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
622 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
623 int partno, sector_t start,
624 sector_t len, int flags,
625 struct partition_meta_info
626 *info);
627 extern void __delete_partition(struct percpu_ref *);
628 extern void delete_partition(struct gendisk *, int);
629 extern void printk_all_partitions(void);
630
631 extern struct gendisk *alloc_disk_node(int minors, int node_id);
632 extern struct gendisk *alloc_disk(int minors);
633 extern struct kobject *get_disk(struct gendisk *disk);
634 extern void put_disk(struct gendisk *disk);
635 extern void blk_register_region(dev_t devt, unsigned long range,
636 struct module *module,
637 struct kobject *(*probe)(dev_t, int *, void *),
638 int (*lock)(dev_t, void *),
639 void *data);
640 extern void blk_unregister_region(dev_t devt, unsigned long range);
641
642 extern ssize_t part_size_show(struct device *dev,
643 struct device_attribute *attr, char *buf);
644 extern ssize_t part_stat_show(struct device *dev,
645 struct device_attribute *attr, char *buf);
646 extern ssize_t part_inflight_show(struct device *dev,
647 struct device_attribute *attr, char *buf);
648 #ifdef CONFIG_FAIL_MAKE_REQUEST
649 extern ssize_t part_fail_show(struct device *dev,
650 struct device_attribute *attr, char *buf);
651 extern ssize_t part_fail_store(struct device *dev,
652 struct device_attribute *attr,
653 const char *buf, size_t count);
654 #endif /* CONFIG_FAIL_MAKE_REQUEST */
655
hd_ref_init(struct hd_struct * part)656 static inline int hd_ref_init(struct hd_struct *part)
657 {
658 if (percpu_ref_init(&part->ref, __delete_partition, 0,
659 GFP_KERNEL))
660 return -ENOMEM;
661 return 0;
662 }
663
hd_struct_get(struct hd_struct * part)664 static inline void hd_struct_get(struct hd_struct *part)
665 {
666 percpu_ref_get(&part->ref);
667 }
668
hd_struct_try_get(struct hd_struct * part)669 static inline int hd_struct_try_get(struct hd_struct *part)
670 {
671 return percpu_ref_tryget_live(&part->ref);
672 }
673
hd_struct_put(struct hd_struct * part)674 static inline void hd_struct_put(struct hd_struct *part)
675 {
676 percpu_ref_put(&part->ref);
677 }
678
hd_struct_kill(struct hd_struct * part)679 static inline void hd_struct_kill(struct hd_struct *part)
680 {
681 percpu_ref_kill(&part->ref);
682 }
683
hd_free_part(struct hd_struct * part)684 static inline void hd_free_part(struct hd_struct *part)
685 {
686 free_part_stats(part);
687 free_part_info(part);
688 percpu_ref_exit(&part->ref);
689 }
690
691 /*
692 * Any access of part->nr_sects which is not protected by partition
693 * bd_mutex or gendisk bdev bd_mutex, should be done using this
694 * accessor function.
695 *
696 * Code written along the lines of i_size_read() and i_size_write().
697 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
698 * on.
699 */
part_nr_sects_read(struct hd_struct * part)700 static inline sector_t part_nr_sects_read(struct hd_struct *part)
701 {
702 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
703 sector_t nr_sects;
704 unsigned seq;
705 do {
706 seq = read_seqcount_begin(&part->nr_sects_seq);
707 nr_sects = part->nr_sects;
708 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
709 return nr_sects;
710 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
711 sector_t nr_sects;
712
713 preempt_disable();
714 nr_sects = part->nr_sects;
715 preempt_enable();
716 return nr_sects;
717 #else
718 return part->nr_sects;
719 #endif
720 }
721
722 /*
723 * Should be called with mutex lock held (typically bd_mutex) of partition
724 * to provide mutual exlusion among writers otherwise seqcount might be
725 * left in wrong state leaving the readers spinning infinitely.
726 */
part_nr_sects_write(struct hd_struct * part,sector_t size)727 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
728 {
729 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
730 preempt_disable();
731 write_seqcount_begin(&part->nr_sects_seq);
732 part->nr_sects = size;
733 write_seqcount_end(&part->nr_sects_seq);
734 preempt_enable();
735 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
736 preempt_disable();
737 part->nr_sects = size;
738 preempt_enable();
739 #else
740 part->nr_sects = size;
741 #endif
742 }
743
744 #if defined(CONFIG_BLK_DEV_INTEGRITY)
745 extern void blk_integrity_add(struct gendisk *);
746 extern void blk_integrity_del(struct gendisk *);
747 #else /* CONFIG_BLK_DEV_INTEGRITY */
blk_integrity_add(struct gendisk * disk)748 static inline void blk_integrity_add(struct gendisk *disk) { }
blk_integrity_del(struct gendisk * disk)749 static inline void blk_integrity_del(struct gendisk *disk) { }
750 #endif /* CONFIG_BLK_DEV_INTEGRITY */
751
752 #else /* CONFIG_BLOCK */
753
printk_all_partitions(void)754 static inline void printk_all_partitions(void) { }
755
blk_lookup_devt(const char * name,int partno)756 static inline dev_t blk_lookup_devt(const char *name, int partno)
757 {
758 dev_t devt = MKDEV(0, 0);
759 return devt;
760 }
761
blk_part_pack_uuid(const u8 * uuid_str,u8 * to)762 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
763 {
764 return -EINVAL;
765 }
766 #endif /* CONFIG_BLOCK */
767
768 #endif /* _LINUX_GENHD_H */
769