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Linux 4.6-rc6
[cris-mirror.git] / include / linux / genhd.h
blob5c706765404a85f4d097eba66da659601f8c073a
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 struct badblocks;
166
167 #if defined(CONFIG_BLK_DEV_INTEGRITY)
168
169 struct blk_integrity {
170 struct blk_integrity_profile *profile;
171 unsigned char flags;
172 unsigned char tuple_size;
173 unsigned char interval_exp;
174 unsigned char tag_size;
175 };
176
177 #endif /* CONFIG_BLK_DEV_INTEGRITY */
178
179 struct gendisk {
180 /* major, first_minor and minors are input parameters only,
181 * don't use directly. Use disk_devt() and disk_max_parts().
182 */
183 int major; /* major number of driver */
184 int first_minor;
185 int minors; /* maximum number of minors, =1 for
186 * disks that can't be partitioned. */
187
188 char disk_name[DISK_NAME_LEN]; /* name of major driver */
189 char *(*devnode)(struct gendisk *gd, umode_t *mode);
190
191 unsigned int events; /* supported events */
192 unsigned int async_events; /* async events, subset of all */
193
194 /* Array of pointers to partitions indexed by partno.
195 * Protected with matching bdev lock but stat and other
196 * non-critical accesses use RCU. Always access through
197 * helpers.
198 */
199 struct disk_part_tbl __rcu *part_tbl;
200 struct hd_struct part0;
201
202 const struct block_device_operations *fops;
203 struct request_queue *queue;
204 void *private_data;
205
206 int flags;
207 struct device *driverfs_dev; // FIXME: remove
208 struct kobject *slave_dir;
209
210 struct timer_rand_state *random;
211 atomic_t sync_io; /* RAID */
212 struct disk_events *ev;
213 #ifdef CONFIG_BLK_DEV_INTEGRITY
214 struct kobject integrity_kobj;
215 #endif /* CONFIG_BLK_DEV_INTEGRITY */
216 int node_id;
217 struct badblocks *bb;
218 };
219
220 static inline struct gendisk *part_to_disk(struct hd_struct *part)
221 {
222 if (likely(part)) {
223 if (part->partno)
224 return dev_to_disk(part_to_dev(part)->parent);
225 else
226 return dev_to_disk(part_to_dev(part));
227 }
228 return NULL;
229 }
230
231 static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
232 {
233 int i;
234 for (i = 0; i < 16; ++i) {
235 *to++ = (hex_to_bin(*uuid_str) << 4) |
236 (hex_to_bin(*(uuid_str + 1)));
237 uuid_str += 2;
238 switch (i) {
239 case 3:
240 case 5:
241 case 7:
242 case 9:
243 uuid_str++;
244 continue;
245 }
246 }
247 }
248
249 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
250 {
251 part_pack_uuid(uuid_str, to);
252 return 0;
253 }
254
255 static inline int disk_max_parts(struct gendisk *disk)
256 {
257 if (disk->flags & GENHD_FL_EXT_DEVT)
258 return DISK_MAX_PARTS;
259 return disk->minors;
260 }
261
262 static inline bool disk_part_scan_enabled(struct gendisk *disk)
263 {
264 return disk_max_parts(disk) > 1 &&
265 !(disk->flags & GENHD_FL_NO_PART_SCAN);
266 }
267
268 static inline dev_t disk_devt(struct gendisk *disk)
269 {
270 return disk_to_dev(disk)->devt;
271 }
272
273 static inline dev_t part_devt(struct hd_struct *part)
274 {
275 return part_to_dev(part)->devt;
276 }
277
278 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
279
280 static inline void disk_put_part(struct hd_struct *part)
281 {
282 if (likely(part))
283 put_device(part_to_dev(part));
284 }
285
286 /*
287 * Smarter partition iterator without context limits.
288 */
289 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
290 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
291 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
292 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
293
294 struct disk_part_iter {
295 struct gendisk *disk;
296 struct hd_struct *part;
297 int idx;
298 unsigned int flags;
299 };
300
301 extern void disk_part_iter_init(struct disk_part_iter *piter,
302 struct gendisk *disk, unsigned int flags);
303 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
304 extern void disk_part_iter_exit(struct disk_part_iter *piter);
305
306 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
307 sector_t sector);
308
309 /*
310 * Macros to operate on percpu disk statistics:
311 *
312 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
313 * and should be called between disk_stat_lock() and
314 * disk_stat_unlock().
315 *
316 * part_stat_read() can be called at any time.
317 *
318 * part_stat_{add|set_all}() and {init|free}_part_stats are for
319 * internal use only.
320 */
321 #ifdef CONFIG_SMP
322 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
323 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
324
325 #define __part_stat_add(cpu, part, field, addnd) \
326 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
327
328 #define part_stat_read(part, field) \
329 ({ \
330 typeof((part)->dkstats->field) res = 0; \
331 unsigned int _cpu; \
332 for_each_possible_cpu(_cpu) \
333 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
334 res; \
335 })
336
337 static inline void part_stat_set_all(struct hd_struct *part, int value)
338 {
339 int i;
340
341 for_each_possible_cpu(i)
342 memset(per_cpu_ptr(part->dkstats, i), value,
343 sizeof(struct disk_stats));
344 }
345
346 static inline int init_part_stats(struct hd_struct *part)
347 {
348 part->dkstats = alloc_percpu(struct disk_stats);
349 if (!part->dkstats)
350 return 0;
351 return 1;
352 }
353
354 static inline void free_part_stats(struct hd_struct *part)
355 {
356 free_percpu(part->dkstats);
357 }
358
359 #else /* !CONFIG_SMP */
360 #define part_stat_lock() ({ rcu_read_lock(); 0; })
361 #define part_stat_unlock() rcu_read_unlock()
362
363 #define __part_stat_add(cpu, part, field, addnd) \
364 ((part)->dkstats.field += addnd)
365
366 #define part_stat_read(part, field) ((part)->dkstats.field)
367
368 static inline void part_stat_set_all(struct hd_struct *part, int value)
369 {
370 memset(&part->dkstats, value, sizeof(struct disk_stats));
371 }
372
373 static inline int init_part_stats(struct hd_struct *part)
374 {
375 return 1;
376 }
377
378 static inline void free_part_stats(struct hd_struct *part)
379 {
380 }
381
382 #endif /* CONFIG_SMP */
383
384 #define part_stat_add(cpu, part, field, addnd) do { \
385 __part_stat_add((cpu), (part), field, addnd); \
386 if ((part)->partno) \
387 __part_stat_add((cpu), &part_to_disk((part))->part0, \
388 field, addnd); \
389 } while (0)
390
391 #define part_stat_dec(cpu, gendiskp, field) \
392 part_stat_add(cpu, gendiskp, field, -1)
393 #define part_stat_inc(cpu, gendiskp, field) \
394 part_stat_add(cpu, gendiskp, field, 1)
395 #define part_stat_sub(cpu, gendiskp, field, subnd) \
396 part_stat_add(cpu, gendiskp, field, -subnd)
397
398 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
399 {
400 atomic_inc(&part->in_flight[rw]);
401 if (part->partno)
402 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
403 }
404
405 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
406 {
407 atomic_dec(&part->in_flight[rw]);
408 if (part->partno)
409 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
410 }
411
412 static inline int part_in_flight(struct hd_struct *part)
413 {
414 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
415 }
416
417 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
418 {
419 if (disk)
420 return kzalloc_node(sizeof(struct partition_meta_info),
421 GFP_KERNEL, disk->node_id);
422 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
423 }
424
425 static inline void free_part_info(struct hd_struct *part)
426 {
427 kfree(part->info);
428 }
429
430 /* block/blk-core.c */
431 extern void part_round_stats(int cpu, struct hd_struct *part);
432
433 /* block/genhd.c */
434 extern void add_disk(struct gendisk *disk);
435 extern void del_gendisk(struct gendisk *gp);
436 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
437 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
438
439 extern void set_device_ro(struct block_device *bdev, int flag);
440 extern void set_disk_ro(struct gendisk *disk, int flag);
441
442 static inline int get_disk_ro(struct gendisk *disk)
443 {
444 return disk->part0.policy;
445 }
446
447 extern void disk_block_events(struct gendisk *disk);
448 extern void disk_unblock_events(struct gendisk *disk);
449 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
450 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
451
452 /* drivers/char/random.c */
453 extern void add_disk_randomness(struct gendisk *disk);
454 extern void rand_initialize_disk(struct gendisk *disk);
455
456 static inline sector_t get_start_sect(struct block_device *bdev)
457 {
458 return bdev->bd_part->start_sect;
459 }
460 static inline sector_t get_capacity(struct gendisk *disk)
461 {
462 return disk->part0.nr_sects;
463 }
464 static inline void set_capacity(struct gendisk *disk, sector_t size)
465 {
466 disk->part0.nr_sects = size;
467 }
468
469 #ifdef CONFIG_SOLARIS_X86_PARTITION
470
471 #define SOLARIS_X86_NUMSLICE 16
472 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
473
474 struct solaris_x86_slice {
475 __le16 s_tag; /* ID tag of partition */
476 __le16 s_flag; /* permission flags */
477 __le32 s_start; /* start sector no of partition */
478 __le32 s_size; /* # of blocks in partition */
479 };
480
481 struct solaris_x86_vtoc {
482 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
483 __le32 v_sanity; /* to verify vtoc sanity */
484 __le32 v_version; /* layout version */
485 char v_volume[8]; /* volume name */
486 __le16 v_sectorsz; /* sector size in bytes */
487 __le16 v_nparts; /* number of partitions */
488 unsigned int v_reserved[10]; /* free space */
489 struct solaris_x86_slice
490 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
491 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
492 char v_asciilabel[128]; /* for compatibility */
493 };
494
495 #endif /* CONFIG_SOLARIS_X86_PARTITION */
496
497 #ifdef CONFIG_BSD_DISKLABEL
498 /*
499 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
500 * updated by Marc Espie <Marc.Espie@openbsd.org>
501 */
502
503 /* check against BSD src/sys/sys/disklabel.h for consistency */
504
505 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
506 #define BSD_MAXPARTITIONS 16
507 #define OPENBSD_MAXPARTITIONS 16
508 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
509 struct bsd_disklabel {
510 __le32 d_magic; /* the magic number */
511 __s16 d_type; /* drive type */
512 __s16 d_subtype; /* controller/d_type specific */
513 char d_typename[16]; /* type name, e.g. "eagle" */
514 char d_packname[16]; /* pack identifier */
515 __u32 d_secsize; /* # of bytes per sector */
516 __u32 d_nsectors; /* # of data sectors per track */
517 __u32 d_ntracks; /* # of tracks per cylinder */
518 __u32 d_ncylinders; /* # of data cylinders per unit */
519 __u32 d_secpercyl; /* # of data sectors per cylinder */
520 __u32 d_secperunit; /* # of data sectors per unit */
521 __u16 d_sparespertrack; /* # of spare sectors per track */
522 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
523 __u32 d_acylinders; /* # of alt. cylinders per unit */
524 __u16 d_rpm; /* rotational speed */
525 __u16 d_interleave; /* hardware sector interleave */
526 __u16 d_trackskew; /* sector 0 skew, per track */
527 __u16 d_cylskew; /* sector 0 skew, per cylinder */
528 __u32 d_headswitch; /* head switch time, usec */
529 __u32 d_trkseek; /* track-to-track seek, usec */
530 __u32 d_flags; /* generic flags */
531 #define NDDATA 5
532 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
533 #define NSPARE 5
534 __u32 d_spare[NSPARE]; /* reserved for future use */
535 __le32 d_magic2; /* the magic number (again) */
536 __le16 d_checksum; /* xor of data incl. partitions */
537
538 /* filesystem and partition information: */
539 __le16 d_npartitions; /* number of partitions in following */
540 __le32 d_bbsize; /* size of boot area at sn0, bytes */
541 __le32 d_sbsize; /* max size of fs superblock, bytes */
542 struct bsd_partition { /* the partition table */
543 __le32 p_size; /* number of sectors in partition */
544 __le32 p_offset; /* starting sector */
545 __le32 p_fsize; /* filesystem basic fragment size */
546 __u8 p_fstype; /* filesystem type, see below */
547 __u8 p_frag; /* filesystem fragments per block */
548 __le16 p_cpg; /* filesystem cylinders per group */
549 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
550 };
551
552 #endif /* CONFIG_BSD_DISKLABEL */
553
554 #ifdef CONFIG_UNIXWARE_DISKLABEL
555 /*
556 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
557 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
558 */
559
560 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
561 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
562 #define UNIXWARE_NUMSLICE 16
563 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
564
565 struct unixware_slice {
566 __le16 s_label; /* label */
567 __le16 s_flags; /* permission flags */
568 __le32 start_sect; /* starting sector */
569 __le32 nr_sects; /* number of sectors in slice */
570 };
571
572 struct unixware_disklabel {
573 __le32 d_type; /* drive type */
574 __le32 d_magic; /* the magic number */
575 __le32 d_version; /* version number */
576 char d_serial[12]; /* serial number of the device */
577 __le32 d_ncylinders; /* # of data cylinders per device */
578 __le32 d_ntracks; /* # of tracks per cylinder */
579 __le32 d_nsectors; /* # of data sectors per track */
580 __le32 d_secsize; /* # of bytes per sector */
581 __le32 d_part_start; /* # of first sector of this partition */
582 __le32 d_unknown1[12]; /* ? */
583 __le32 d_alt_tbl; /* byte offset of alternate table */
584 __le32 d_alt_len; /* byte length of alternate table */
585 __le32 d_phys_cyl; /* # of physical cylinders per device */
586 __le32 d_phys_trk; /* # of physical tracks per cylinder */
587 __le32 d_phys_sec; /* # of physical sectors per track */
588 __le32 d_phys_bytes; /* # of physical bytes per sector */
589 __le32 d_unknown2; /* ? */
590 __le32 d_unknown3; /* ? */
591 __le32 d_pad[8]; /* pad */
592
593 struct unixware_vtoc {
594 __le32 v_magic; /* the magic number */
595 __le32 v_version; /* version number */
596 char v_name[8]; /* volume name */
597 __le16 v_nslices; /* # of slices */
598 __le16 v_unknown1; /* ? */
599 __le32 v_reserved[10]; /* reserved */
600 struct unixware_slice
601 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
602 } vtoc;
603
604 }; /* 408 */
605
606 #endif /* CONFIG_UNIXWARE_DISKLABEL */
607
608 #ifdef CONFIG_MINIX_SUBPARTITION
609 # define MINIX_NR_SUBPARTITIONS 4
610 #endif /* CONFIG_MINIX_SUBPARTITION */
611
612 #define ADDPART_FLAG_NONE 0
613 #define ADDPART_FLAG_RAID 1
614 #define ADDPART_FLAG_WHOLEDISK 2
615
616 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
617 extern void blk_free_devt(dev_t devt);
618 extern dev_t blk_lookup_devt(const char *name, int partno);
619 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
620
621 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
622 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
623 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
624 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
625 int partno, sector_t start,
626 sector_t len, int flags,
627 struct partition_meta_info
628 *info);
629 extern void __delete_partition(struct percpu_ref *);
630 extern void delete_partition(struct gendisk *, int);
631 extern void printk_all_partitions(void);
632
633 extern struct gendisk *alloc_disk_node(int minors, int node_id);
634 extern struct gendisk *alloc_disk(int minors);
635 extern struct kobject *get_disk(struct gendisk *disk);
636 extern void put_disk(struct gendisk *disk);
637 extern void blk_register_region(dev_t devt, unsigned long range,
638 struct module *module,
639 struct kobject *(*probe)(dev_t, int *, void *),
640 int (*lock)(dev_t, void *),
641 void *data);
642 extern void blk_unregister_region(dev_t devt, unsigned long range);
643
644 extern ssize_t part_size_show(struct device *dev,
645 struct device_attribute *attr, char *buf);
646 extern ssize_t part_stat_show(struct device *dev,
647 struct device_attribute *attr, char *buf);
648 extern ssize_t part_inflight_show(struct device *dev,
649 struct device_attribute *attr, char *buf);
650 #ifdef CONFIG_FAIL_MAKE_REQUEST
651 extern ssize_t part_fail_show(struct device *dev,
652 struct device_attribute *attr, char *buf);
653 extern ssize_t part_fail_store(struct device *dev,
654 struct device_attribute *attr,
655 const char *buf, size_t count);
656 #endif /* CONFIG_FAIL_MAKE_REQUEST */
657
658 static inline int hd_ref_init(struct hd_struct *part)
659 {
660 if (percpu_ref_init(&part->ref, __delete_partition, 0,
661 GFP_KERNEL))
662 return -ENOMEM;
663 return 0;
664 }
665
666 static inline void hd_struct_get(struct hd_struct *part)
667 {
668 percpu_ref_get(&part->ref);
669 }
670
671 static inline int hd_struct_try_get(struct hd_struct *part)
672 {
673 return percpu_ref_tryget_live(&part->ref);
674 }
675
676 static inline void hd_struct_put(struct hd_struct *part)
677 {
678 percpu_ref_put(&part->ref);
679 }
680
681 static inline void hd_struct_kill(struct hd_struct *part)
682 {
683 percpu_ref_kill(&part->ref);
684 }
685
686 static inline void hd_free_part(struct hd_struct *part)
687 {
688 free_part_stats(part);
689 free_part_info(part);
690 percpu_ref_exit(&part->ref);
691 }
692
693 /*
694 * Any access of part->nr_sects which is not protected by partition
695 * bd_mutex or gendisk bdev bd_mutex, should be done using this
696 * accessor function.
697 *
698 * Code written along the lines of i_size_read() and i_size_write().
699 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
700 * on.
701 */
702 static inline sector_t part_nr_sects_read(struct hd_struct *part)
703 {
704 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
705 sector_t nr_sects;
706 unsigned seq;
707 do {
708 seq = read_seqcount_begin(&part->nr_sects_seq);
709 nr_sects = part->nr_sects;
710 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
711 return nr_sects;
712 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
713 sector_t nr_sects;
714
715 preempt_disable();
716 nr_sects = part->nr_sects;
717 preempt_enable();
718 return nr_sects;
719 #else
720 return part->nr_sects;
721 #endif
722 }
723
724 /*
725 * Should be called with mutex lock held (typically bd_mutex) of partition
726 * to provide mutual exlusion among writers otherwise seqcount might be
727 * left in wrong state leaving the readers spinning infinitely.
728 */
729 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
730 {
731 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
732 write_seqcount_begin(&part->nr_sects_seq);
733 part->nr_sects = size;
734 write_seqcount_end(&part->nr_sects_seq);
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 extern void blk_integrity_revalidate(struct gendisk *);
748 #else /* CONFIG_BLK_DEV_INTEGRITY */
749 static inline void blk_integrity_add(struct gendisk *disk) { }
750 static inline void blk_integrity_del(struct gendisk *disk) { }
751 static inline void blk_integrity_revalidate(struct gendisk *disk) { }
752 #endif /* CONFIG_BLK_DEV_INTEGRITY */
753
754 #else /* CONFIG_BLOCK */
755
756 static inline void printk_all_partitions(void) { }
757
758 static inline dev_t blk_lookup_devt(const char *name, int partno)
759 {
760 dev_t devt = MKDEV(0, 0);
761 return devt;
762 }
763
764 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
765 {
766 return -EINVAL;
767 }
768 #endif /* CONFIG_BLOCK */
769
770 #endif /* _LINUX_GENHD_H */
CRIS linux kernel tree