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signal: Fix sending signals with siginfo
[cris-mirror.git] / include / linux / genhd.h
blobe619fae2f0375e073e5f3216fd764676ae1340b8
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 #include <linux/uuid.h>
18
19 #ifdef CONFIG_BLOCK
20
21 #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
22 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
23 #define disk_to_dev(disk) (&(disk)->part0.__dev)
24 #define part_to_dev(part) (&((part)->__dev))
25
26 extern struct device_type part_type;
27 extern struct kobject *block_depr;
28 extern struct class block_class;
29
30 enum {
31 /* These three have identical behaviour; use the second one if DOS FDISK gets
32 confused about extended/logical partitions starting past cylinder 1023. */
33 DOS_EXTENDED_PARTITION = 5,
34 LINUX_EXTENDED_PARTITION = 0x85,
35 WIN98_EXTENDED_PARTITION = 0x0f,
36
37 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
38
39 LINUX_SWAP_PARTITION = 0x82,
40 LINUX_DATA_PARTITION = 0x83,
41 LINUX_LVM_PARTITION = 0x8e,
42 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
43
44 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
45 NEW_SOLARIS_X86_PARTITION = 0xbf,
46
47 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
48 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
49 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
50 EZD_PARTITION = 0x55, /* EZ-DRIVE */
51
52 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
53 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
54 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
55 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
56 MINIX_PARTITION = 0x81, /* Minix Partition ID */
57 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
58 };
59
60 #define DISK_MAX_PARTS 256
61 #define DISK_NAME_LEN 32
62
63 #include <linux/major.h>
64 #include <linux/device.h>
65 #include <linux/smp.h>
66 #include <linux/string.h>
67 #include <linux/fs.h>
68 #include <linux/workqueue.h>
69
70 struct partition {
71 unsigned char boot_ind; /* 0x80 - active */
72 unsigned char head; /* starting head */
73 unsigned char sector; /* starting sector */
74 unsigned char cyl; /* starting cylinder */
75 unsigned char sys_ind; /* What partition type */
76 unsigned char end_head; /* end head */
77 unsigned char end_sector; /* end sector */
78 unsigned char end_cyl; /* end cylinder */
79 __le32 start_sect; /* starting sector counting from 0 */
80 __le32 nr_sects; /* nr of sectors in partition */
81 } __attribute__((packed));
82
83 struct disk_stats {
84 unsigned long sectors[2]; /* READs and WRITEs */
85 unsigned long ios[2];
86 unsigned long merges[2];
87 unsigned long ticks[2];
88 unsigned long io_ticks;
89 unsigned long time_in_queue;
90 };
91
92 #define PARTITION_META_INFO_VOLNAMELTH 64
93 /*
94 * Enough for the string representation of any kind of UUID plus NULL.
95 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
96 */
97 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
98
99 struct partition_meta_info {
100 char uuid[PARTITION_META_INFO_UUIDLTH];
101 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
102 };
103
104 struct hd_struct {
105 sector_t start_sect;
106 /*
107 * nr_sects is protected by sequence counter. One might extend a
108 * partition while IO is happening to it and update of nr_sects
109 * can be non-atomic on 32bit machines with 64bit sector_t.
110 */
111 sector_t nr_sects;
112 seqcount_t nr_sects_seq;
113 sector_t alignment_offset;
114 unsigned int discard_alignment;
115 struct device __dev;
116 struct kobject *holder_dir;
117 int policy, partno;
118 struct partition_meta_info *info;
119 #ifdef CONFIG_FAIL_MAKE_REQUEST
120 int make_it_fail;
121 #endif
122 unsigned long stamp;
123 atomic_t in_flight[2];
124 #ifdef CONFIG_SMP
125 struct disk_stats __percpu *dkstats;
126 #else
127 struct disk_stats dkstats;
128 #endif
129 struct percpu_ref ref;
130 struct rcu_head rcu_head;
131 };
132
133 #define GENHD_FL_REMOVABLE 1
134 /* 2 is unused */
135 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
136 #define GENHD_FL_CD 8
137 #define GENHD_FL_UP 16
138 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
139 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
140 #define GENHD_FL_NATIVE_CAPACITY 128
141 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
142 #define GENHD_FL_NO_PART_SCAN 512
143
144 enum {
145 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
146 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
147 };
148
149 struct disk_part_tbl {
150 struct rcu_head rcu_head;
151 int len;
152 struct hd_struct __rcu *last_lookup;
153 struct hd_struct __rcu *part[];
154 };
155
156 struct disk_events;
157 struct badblocks;
158
159 #if defined(CONFIG_BLK_DEV_INTEGRITY)
160
161 struct blk_integrity {
162 const struct blk_integrity_profile *profile;
163 unsigned char flags;
164 unsigned char tuple_size;
165 unsigned char interval_exp;
166 unsigned char tag_size;
167 };
168
169 #endif /* CONFIG_BLK_DEV_INTEGRITY */
170
171 struct gendisk {
172 /* major, first_minor and minors are input parameters only,
173 * don't use directly. Use disk_devt() and disk_max_parts().
174 */
175 int major; /* major number of driver */
176 int first_minor;
177 int minors; /* maximum number of minors, =1 for
178 * disks that can't be partitioned. */
179
180 char disk_name[DISK_NAME_LEN]; /* name of major driver */
181 char *(*devnode)(struct gendisk *gd, umode_t *mode);
182
183 unsigned int events; /* supported events */
184 unsigned int async_events; /* async events, subset of all */
185
186 /* Array of pointers to partitions indexed by partno.
187 * Protected with matching bdev lock but stat and other
188 * non-critical accesses use RCU. Always access through
189 * helpers.
190 */
191 struct disk_part_tbl __rcu *part_tbl;
192 struct hd_struct part0;
193
194 const struct block_device_operations *fops;
195 struct request_queue *queue;
196 void *private_data;
197
198 int flags;
199 struct kobject *slave_dir;
200
201 struct timer_rand_state *random;
202 atomic_t sync_io; /* RAID */
203 struct disk_events *ev;
204 #ifdef CONFIG_BLK_DEV_INTEGRITY
205 struct kobject integrity_kobj;
206 #endif /* CONFIG_BLK_DEV_INTEGRITY */
207 int node_id;
208 struct badblocks *bb;
209 };
210
211 static inline struct gendisk *part_to_disk(struct hd_struct *part)
212 {
213 if (likely(part)) {
214 if (part->partno)
215 return dev_to_disk(part_to_dev(part)->parent);
216 else
217 return dev_to_disk(part_to_dev(part));
218 }
219 return NULL;
220 }
221
222 static inline int disk_max_parts(struct gendisk *disk)
223 {
224 if (disk->flags & GENHD_FL_EXT_DEVT)
225 return DISK_MAX_PARTS;
226 return disk->minors;
227 }
228
229 static inline bool disk_part_scan_enabled(struct gendisk *disk)
230 {
231 return disk_max_parts(disk) > 1 &&
232 !(disk->flags & GENHD_FL_NO_PART_SCAN);
233 }
234
235 static inline dev_t disk_devt(struct gendisk *disk)
236 {
237 return disk_to_dev(disk)->devt;
238 }
239
240 static inline dev_t part_devt(struct hd_struct *part)
241 {
242 return part_to_dev(part)->devt;
243 }
244
245 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
246
247 static inline void disk_put_part(struct hd_struct *part)
248 {
249 if (likely(part))
250 put_device(part_to_dev(part));
251 }
252
253 /*
254 * Smarter partition iterator without context limits.
255 */
256 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
257 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
258 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
259 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
260
261 struct disk_part_iter {
262 struct gendisk *disk;
263 struct hd_struct *part;
264 int idx;
265 unsigned int flags;
266 };
267
268 extern void disk_part_iter_init(struct disk_part_iter *piter,
269 struct gendisk *disk, unsigned int flags);
270 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
271 extern void disk_part_iter_exit(struct disk_part_iter *piter);
272
273 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
274 sector_t sector);
275
276 /*
277 * Macros to operate on percpu disk statistics:
278 *
279 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
280 * and should be called between disk_stat_lock() and
281 * disk_stat_unlock().
282 *
283 * part_stat_read() can be called at any time.
284 *
285 * part_stat_{add|set_all}() and {init|free}_part_stats are for
286 * internal use only.
287 */
288 #ifdef CONFIG_SMP
289 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
290 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
291
292 #define __part_stat_add(cpu, part, field, addnd) \
293 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
294
295 #define part_stat_read(part, field) \
296 ({ \
297 typeof((part)->dkstats->field) res = 0; \
298 unsigned int _cpu; \
299 for_each_possible_cpu(_cpu) \
300 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
301 res; \
302 })
303
304 static inline void part_stat_set_all(struct hd_struct *part, int value)
305 {
306 int i;
307
308 for_each_possible_cpu(i)
309 memset(per_cpu_ptr(part->dkstats, i), value,
310 sizeof(struct disk_stats));
311 }
312
313 static inline int init_part_stats(struct hd_struct *part)
314 {
315 part->dkstats = alloc_percpu(struct disk_stats);
316 if (!part->dkstats)
317 return 0;
318 return 1;
319 }
320
321 static inline void free_part_stats(struct hd_struct *part)
322 {
323 free_percpu(part->dkstats);
324 }
325
326 #else /* !CONFIG_SMP */
327 #define part_stat_lock() ({ rcu_read_lock(); 0; })
328 #define part_stat_unlock() rcu_read_unlock()
329
330 #define __part_stat_add(cpu, part, field, addnd) \
331 ((part)->dkstats.field += addnd)
332
333 #define part_stat_read(part, field) ((part)->dkstats.field)
334
335 static inline void part_stat_set_all(struct hd_struct *part, int value)
336 {
337 memset(&part->dkstats, value, sizeof(struct disk_stats));
338 }
339
340 static inline int init_part_stats(struct hd_struct *part)
341 {
342 return 1;
343 }
344
345 static inline void free_part_stats(struct hd_struct *part)
346 {
347 }
348
349 #endif /* CONFIG_SMP */
350
351 #define part_stat_add(cpu, part, field, addnd) do { \
352 __part_stat_add((cpu), (part), field, addnd); \
353 if ((part)->partno) \
354 __part_stat_add((cpu), &part_to_disk((part))->part0, \
355 field, addnd); \
356 } while (0)
357
358 #define part_stat_dec(cpu, gendiskp, field) \
359 part_stat_add(cpu, gendiskp, field, -1)
360 #define part_stat_inc(cpu, gendiskp, field) \
361 part_stat_add(cpu, gendiskp, field, 1)
362 #define part_stat_sub(cpu, gendiskp, field, subnd) \
363 part_stat_add(cpu, gendiskp, field, -subnd)
364
365 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
366 {
367 atomic_inc(&part->in_flight[rw]);
368 if (part->partno)
369 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
370 }
371
372 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
373 {
374 atomic_dec(&part->in_flight[rw]);
375 if (part->partno)
376 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
377 }
378
379 static inline int part_in_flight(struct hd_struct *part)
380 {
381 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
382 }
383
384 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
385 {
386 if (disk)
387 return kzalloc_node(sizeof(struct partition_meta_info),
388 GFP_KERNEL, disk->node_id);
389 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
390 }
391
392 static inline void free_part_info(struct hd_struct *part)
393 {
394 kfree(part->info);
395 }
396
397 /* block/blk-core.c */
398 extern void part_round_stats(int cpu, struct hd_struct *part);
399
400 /* block/genhd.c */
401 extern void device_add_disk(struct device *parent, struct gendisk *disk);
402 static inline void add_disk(struct gendisk *disk)
403 {
404 device_add_disk(NULL, disk);
405 }
406
407 extern void del_gendisk(struct gendisk *gp);
408 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
409 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
410
411 extern void set_device_ro(struct block_device *bdev, int flag);
412 extern void set_disk_ro(struct gendisk *disk, int flag);
413
414 static inline int get_disk_ro(struct gendisk *disk)
415 {
416 return disk->part0.policy;
417 }
418
419 extern void disk_block_events(struct gendisk *disk);
420 extern void disk_unblock_events(struct gendisk *disk);
421 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
422 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
423
424 /* drivers/char/random.c */
425 extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
426 extern void rand_initialize_disk(struct gendisk *disk);
427
428 static inline sector_t get_start_sect(struct block_device *bdev)
429 {
430 return bdev->bd_part->start_sect;
431 }
432 static inline sector_t get_capacity(struct gendisk *disk)
433 {
434 return disk->part0.nr_sects;
435 }
436 static inline void set_capacity(struct gendisk *disk, sector_t size)
437 {
438 disk->part0.nr_sects = size;
439 }
440
441 #ifdef CONFIG_SOLARIS_X86_PARTITION
442
443 #define SOLARIS_X86_NUMSLICE 16
444 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
445
446 struct solaris_x86_slice {
447 __le16 s_tag; /* ID tag of partition */
448 __le16 s_flag; /* permission flags */
449 __le32 s_start; /* start sector no of partition */
450 __le32 s_size; /* # of blocks in partition */
451 };
452
453 struct solaris_x86_vtoc {
454 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
455 __le32 v_sanity; /* to verify vtoc sanity */
456 __le32 v_version; /* layout version */
457 char v_volume[8]; /* volume name */
458 __le16 v_sectorsz; /* sector size in bytes */
459 __le16 v_nparts; /* number of partitions */
460 unsigned int v_reserved[10]; /* free space */
461 struct solaris_x86_slice
462 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
463 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
464 char v_asciilabel[128]; /* for compatibility */
465 };
466
467 #endif /* CONFIG_SOLARIS_X86_PARTITION */
468
469 #ifdef CONFIG_BSD_DISKLABEL
470 /*
471 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
472 * updated by Marc Espie <Marc.Espie@openbsd.org>
473 */
474
475 /* check against BSD src/sys/sys/disklabel.h for consistency */
476
477 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
478 #define BSD_MAXPARTITIONS 16
479 #define OPENBSD_MAXPARTITIONS 16
480 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
481 struct bsd_disklabel {
482 __le32 d_magic; /* the magic number */
483 __s16 d_type; /* drive type */
484 __s16 d_subtype; /* controller/d_type specific */
485 char d_typename[16]; /* type name, e.g. "eagle" */
486 char d_packname[16]; /* pack identifier */
487 __u32 d_secsize; /* # of bytes per sector */
488 __u32 d_nsectors; /* # of data sectors per track */
489 __u32 d_ntracks; /* # of tracks per cylinder */
490 __u32 d_ncylinders; /* # of data cylinders per unit */
491 __u32 d_secpercyl; /* # of data sectors per cylinder */
492 __u32 d_secperunit; /* # of data sectors per unit */
493 __u16 d_sparespertrack; /* # of spare sectors per track */
494 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
495 __u32 d_acylinders; /* # of alt. cylinders per unit */
496 __u16 d_rpm; /* rotational speed */
497 __u16 d_interleave; /* hardware sector interleave */
498 __u16 d_trackskew; /* sector 0 skew, per track */
499 __u16 d_cylskew; /* sector 0 skew, per cylinder */
500 __u32 d_headswitch; /* head switch time, usec */
501 __u32 d_trkseek; /* track-to-track seek, usec */
502 __u32 d_flags; /* generic flags */
503 #define NDDATA 5
504 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
505 #define NSPARE 5
506 __u32 d_spare[NSPARE]; /* reserved for future use */
507 __le32 d_magic2; /* the magic number (again) */
508 __le16 d_checksum; /* xor of data incl. partitions */
509
510 /* filesystem and partition information: */
511 __le16 d_npartitions; /* number of partitions in following */
512 __le32 d_bbsize; /* size of boot area at sn0, bytes */
513 __le32 d_sbsize; /* max size of fs superblock, bytes */
514 struct bsd_partition { /* the partition table */
515 __le32 p_size; /* number of sectors in partition */
516 __le32 p_offset; /* starting sector */
517 __le32 p_fsize; /* filesystem basic fragment size */
518 __u8 p_fstype; /* filesystem type, see below */
519 __u8 p_frag; /* filesystem fragments per block */
520 __le16 p_cpg; /* filesystem cylinders per group */
521 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
522 };
523
524 #endif /* CONFIG_BSD_DISKLABEL */
525
526 #ifdef CONFIG_UNIXWARE_DISKLABEL
527 /*
528 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
529 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
530 */
531
532 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
533 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
534 #define UNIXWARE_NUMSLICE 16
535 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
536
537 struct unixware_slice {
538 __le16 s_label; /* label */
539 __le16 s_flags; /* permission flags */
540 __le32 start_sect; /* starting sector */
541 __le32 nr_sects; /* number of sectors in slice */
542 };
543
544 struct unixware_disklabel {
545 __le32 d_type; /* drive type */
546 __le32 d_magic; /* the magic number */
547 __le32 d_version; /* version number */
548 char d_serial[12]; /* serial number of the device */
549 __le32 d_ncylinders; /* # of data cylinders per device */
550 __le32 d_ntracks; /* # of tracks per cylinder */
551 __le32 d_nsectors; /* # of data sectors per track */
552 __le32 d_secsize; /* # of bytes per sector */
553 __le32 d_part_start; /* # of first sector of this partition */
554 __le32 d_unknown1[12]; /* ? */
555 __le32 d_alt_tbl; /* byte offset of alternate table */
556 __le32 d_alt_len; /* byte length of alternate table */
557 __le32 d_phys_cyl; /* # of physical cylinders per device */
558 __le32 d_phys_trk; /* # of physical tracks per cylinder */
559 __le32 d_phys_sec; /* # of physical sectors per track */
560 __le32 d_phys_bytes; /* # of physical bytes per sector */
561 __le32 d_unknown2; /* ? */
562 __le32 d_unknown3; /* ? */
563 __le32 d_pad[8]; /* pad */
564
565 struct unixware_vtoc {
566 __le32 v_magic; /* the magic number */
567 __le32 v_version; /* version number */
568 char v_name[8]; /* volume name */
569 __le16 v_nslices; /* # of slices */
570 __le16 v_unknown1; /* ? */
571 __le32 v_reserved[10]; /* reserved */
572 struct unixware_slice
573 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
574 } vtoc;
575
576 }; /* 408 */
577
578 #endif /* CONFIG_UNIXWARE_DISKLABEL */
579
580 #ifdef CONFIG_MINIX_SUBPARTITION
581 # define MINIX_NR_SUBPARTITIONS 4
582 #endif /* CONFIG_MINIX_SUBPARTITION */
583
584 #define ADDPART_FLAG_NONE 0
585 #define ADDPART_FLAG_RAID 1
586 #define ADDPART_FLAG_WHOLEDISK 2
587
588 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
589 extern void blk_free_devt(dev_t devt);
590 extern dev_t blk_lookup_devt(const char *name, int partno);
591 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
592
593 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
594 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
595 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
596 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
597 int partno, sector_t start,
598 sector_t len, int flags,
599 struct partition_meta_info
600 *info);
601 extern void __delete_partition(struct percpu_ref *);
602 extern void delete_partition(struct gendisk *, int);
603 extern void printk_all_partitions(void);
604
605 extern struct gendisk *alloc_disk_node(int minors, int node_id);
606 extern struct gendisk *alloc_disk(int minors);
607 extern struct kobject *get_disk(struct gendisk *disk);
608 extern void put_disk(struct gendisk *disk);
609 extern void blk_register_region(dev_t devt, unsigned long range,
610 struct module *module,
611 struct kobject *(*probe)(dev_t, int *, void *),
612 int (*lock)(dev_t, void *),
613 void *data);
614 extern void blk_unregister_region(dev_t devt, unsigned long range);
615
616 extern ssize_t part_size_show(struct device *dev,
617 struct device_attribute *attr, char *buf);
618 extern ssize_t part_stat_show(struct device *dev,
619 struct device_attribute *attr, char *buf);
620 extern ssize_t part_inflight_show(struct device *dev,
621 struct device_attribute *attr, char *buf);
622 #ifdef CONFIG_FAIL_MAKE_REQUEST
623 extern ssize_t part_fail_show(struct device *dev,
624 struct device_attribute *attr, char *buf);
625 extern ssize_t part_fail_store(struct device *dev,
626 struct device_attribute *attr,
627 const char *buf, size_t count);
628 #endif /* CONFIG_FAIL_MAKE_REQUEST */
629
630 static inline int hd_ref_init(struct hd_struct *part)
631 {
632 if (percpu_ref_init(&part->ref, __delete_partition, 0,
633 GFP_KERNEL))
634 return -ENOMEM;
635 return 0;
636 }
637
638 static inline void hd_struct_get(struct hd_struct *part)
639 {
640 percpu_ref_get(&part->ref);
641 }
642
643 static inline int hd_struct_try_get(struct hd_struct *part)
644 {
645 return percpu_ref_tryget_live(&part->ref);
646 }
647
648 static inline void hd_struct_put(struct hd_struct *part)
649 {
650 percpu_ref_put(&part->ref);
651 }
652
653 static inline void hd_struct_kill(struct hd_struct *part)
654 {
655 percpu_ref_kill(&part->ref);
656 }
657
658 static inline void hd_free_part(struct hd_struct *part)
659 {
660 free_part_stats(part);
661 free_part_info(part);
662 percpu_ref_exit(&part->ref);
663 }
664
665 /*
666 * Any access of part->nr_sects which is not protected by partition
667 * bd_mutex or gendisk bdev bd_mutex, should be done using this
668 * accessor function.
669 *
670 * Code written along the lines of i_size_read() and i_size_write().
671 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
672 * on.
673 */
674 static inline sector_t part_nr_sects_read(struct hd_struct *part)
675 {
676 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
677 sector_t nr_sects;
678 unsigned seq;
679 do {
680 seq = read_seqcount_begin(&part->nr_sects_seq);
681 nr_sects = part->nr_sects;
682 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
683 return nr_sects;
684 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
685 sector_t nr_sects;
686
687 preempt_disable();
688 nr_sects = part->nr_sects;
689 preempt_enable();
690 return nr_sects;
691 #else
692 return part->nr_sects;
693 #endif
694 }
695
696 /*
697 * Should be called with mutex lock held (typically bd_mutex) of partition
698 * to provide mutual exlusion among writers otherwise seqcount might be
699 * left in wrong state leaving the readers spinning infinitely.
700 */
701 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
702 {
703 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
704 write_seqcount_begin(&part->nr_sects_seq);
705 part->nr_sects = size;
706 write_seqcount_end(&part->nr_sects_seq);
707 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
708 preempt_disable();
709 part->nr_sects = size;
710 preempt_enable();
711 #else
712 part->nr_sects = size;
713 #endif
714 }
715
716 #if defined(CONFIG_BLK_DEV_INTEGRITY)
717 extern void blk_integrity_add(struct gendisk *);
718 extern void blk_integrity_del(struct gendisk *);
719 #else /* CONFIG_BLK_DEV_INTEGRITY */
720 static inline void blk_integrity_add(struct gendisk *disk) { }
721 static inline void blk_integrity_del(struct gendisk *disk) { }
722 #endif /* CONFIG_BLK_DEV_INTEGRITY */
723
724 #else /* CONFIG_BLOCK */
725
726 static inline void printk_all_partitions(void) { }
727
728 static inline dev_t blk_lookup_devt(const char *name, int partno)
729 {
730 dev_t devt = MKDEV(0, 0);
731 return devt;
732 }
733 #endif /* CONFIG_BLOCK */
734
735 #endif /* _LINUX_GENHD_H */
CRIS linux kernel tree