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dmatest: don't use set_freezable_with_signal()
[linux-2.6.git] / include / linux / genhd.h
blob6d18f3531f180f401d35e8028b3395b339182c2e
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 kobj_to_dev(k) container_of((k), struct device, kobj)
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 #define PARTITION_META_INFO_UUIDLTH 16
93
94 struct partition_meta_info {
95 u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */
96 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
97 };
98
99 struct hd_struct {
100 sector_t start_sect;
101 sector_t nr_sects;
102 sector_t alignment_offset;
103 unsigned int discard_alignment;
104 struct device __dev;
105 struct kobject *holder_dir;
106 int policy, partno;
107 struct partition_meta_info *info;
108 #ifdef CONFIG_FAIL_MAKE_REQUEST
109 int make_it_fail;
110 #endif
111 unsigned long stamp;
112 atomic_t in_flight[2];
113 #ifdef CONFIG_SMP
114 struct disk_stats __percpu *dkstats;
115 #else
116 struct disk_stats dkstats;
117 #endif
118 atomic_t ref;
119 struct rcu_head rcu_head;
120 };
121
122 #define GENHD_FL_REMOVABLE 1
123 /* 2 is unused */
124 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
125 #define GENHD_FL_CD 8
126 #define GENHD_FL_UP 16
127 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
128 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
129 #define GENHD_FL_NATIVE_CAPACITY 128
130 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
131 #define GENHD_FL_NO_PART_SCAN 512
132
133 enum {
134 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
135 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
136 };
137
138 #define BLK_SCSI_MAX_CMDS (256)
139 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
140
141 struct blk_scsi_cmd_filter {
142 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
143 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
144 struct kobject kobj;
145 };
146
147 struct disk_part_tbl {
148 struct rcu_head rcu_head;
149 int len;
150 struct hd_struct __rcu *last_lookup;
151 struct hd_struct __rcu *part[];
152 };
153
154 struct disk_events;
155
156 struct gendisk {
157 /* major, first_minor and minors are input parameters only,
158 * don't use directly. Use disk_devt() and disk_max_parts().
159 */
160 int major; /* major number of driver */
161 int first_minor;
162 int minors; /* maximum number of minors, =1 for
163 * disks that can't be partitioned. */
164
165 char disk_name[DISK_NAME_LEN]; /* name of major driver */
166 char *(*devnode)(struct gendisk *gd, mode_t *mode);
167
168 unsigned int events; /* supported events */
169 unsigned int async_events; /* async events, subset of all */
170
171 /* Array of pointers to partitions indexed by partno.
172 * Protected with matching bdev lock but stat and other
173 * non-critical accesses use RCU. Always access through
174 * helpers.
175 */
176 struct disk_part_tbl __rcu *part_tbl;
177 struct hd_struct part0;
178
179 const struct block_device_operations *fops;
180 struct request_queue *queue;
181 void *private_data;
182
183 int flags;
184 struct device *driverfs_dev; // FIXME: remove
185 struct kobject *slave_dir;
186
187 struct timer_rand_state *random;
188 atomic_t sync_io; /* RAID */
189 struct disk_events *ev;
190 #ifdef CONFIG_BLK_DEV_INTEGRITY
191 struct blk_integrity *integrity;
192 #endif
193 int node_id;
194 };
195
196 static inline struct gendisk *part_to_disk(struct hd_struct *part)
197 {
198 if (likely(part)) {
199 if (part->partno)
200 return dev_to_disk(part_to_dev(part)->parent);
201 else
202 return dev_to_disk(part_to_dev(part));
203 }
204 return NULL;
205 }
206
207 static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
208 {
209 int i;
210 for (i = 0; i < 16; ++i) {
211 *to++ = (hex_to_bin(*uuid_str) << 4) |
212 (hex_to_bin(*(uuid_str + 1)));
213 uuid_str += 2;
214 switch (i) {
215 case 3:
216 case 5:
217 case 7:
218 case 9:
219 uuid_str++;
220 continue;
221 }
222 }
223 }
224
225 static inline char *part_unpack_uuid(const u8 *uuid, char *out)
226 {
227 sprintf(out, "%pU", uuid);
228 return out;
229 }
230
231 static inline int disk_max_parts(struct gendisk *disk)
232 {
233 if (disk->flags & GENHD_FL_EXT_DEVT)
234 return DISK_MAX_PARTS;
235 return disk->minors;
236 }
237
238 static inline bool disk_part_scan_enabled(struct gendisk *disk)
239 {
240 return disk_max_parts(disk) > 1 &&
241 !(disk->flags & GENHD_FL_NO_PART_SCAN);
242 }
243
244 static inline dev_t disk_devt(struct gendisk *disk)
245 {
246 return disk_to_dev(disk)->devt;
247 }
248
249 static inline dev_t part_devt(struct hd_struct *part)
250 {
251 return part_to_dev(part)->devt;
252 }
253
254 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
255
256 static inline void disk_put_part(struct hd_struct *part)
257 {
258 if (likely(part))
259 put_device(part_to_dev(part));
260 }
261
262 /*
263 * Smarter partition iterator without context limits.
264 */
265 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
266 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
267 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
268 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
269
270 struct disk_part_iter {
271 struct gendisk *disk;
272 struct hd_struct *part;
273 int idx;
274 unsigned int flags;
275 };
276
277 extern void disk_part_iter_init(struct disk_part_iter *piter,
278 struct gendisk *disk, unsigned int flags);
279 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
280 extern void disk_part_iter_exit(struct disk_part_iter *piter);
281
282 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
283 sector_t sector);
284
285 /*
286 * Macros to operate on percpu disk statistics:
287 *
288 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
289 * and should be called between disk_stat_lock() and
290 * disk_stat_unlock().
291 *
292 * part_stat_read() can be called at any time.
293 *
294 * part_stat_{add|set_all}() and {init|free}_part_stats are for
295 * internal use only.
296 */
297 #ifdef CONFIG_SMP
298 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
299 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
300
301 #define __part_stat_add(cpu, part, field, addnd) \
302 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
303
304 #define part_stat_read(part, field) \
305 ({ \
306 typeof((part)->dkstats->field) res = 0; \
307 unsigned int _cpu; \
308 for_each_possible_cpu(_cpu) \
309 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
310 res; \
311 })
312
313 static inline void part_stat_set_all(struct hd_struct *part, int value)
314 {
315 int i;
316
317 for_each_possible_cpu(i)
318 memset(per_cpu_ptr(part->dkstats, i), value,
319 sizeof(struct disk_stats));
320 }
321
322 static inline int init_part_stats(struct hd_struct *part)
323 {
324 part->dkstats = alloc_percpu(struct disk_stats);
325 if (!part->dkstats)
326 return 0;
327 return 1;
328 }
329
330 static inline void free_part_stats(struct hd_struct *part)
331 {
332 free_percpu(part->dkstats);
333 }
334
335 #else /* !CONFIG_SMP */
336 #define part_stat_lock() ({ rcu_read_lock(); 0; })
337 #define part_stat_unlock() rcu_read_unlock()
338
339 #define __part_stat_add(cpu, part, field, addnd) \
340 ((part)->dkstats.field += addnd)
341
342 #define part_stat_read(part, field) ((part)->dkstats.field)
343
344 static inline void part_stat_set_all(struct hd_struct *part, int value)
345 {
346 memset(&part->dkstats, value, sizeof(struct disk_stats));
347 }
348
349 static inline int init_part_stats(struct hd_struct *part)
350 {
351 return 1;
352 }
353
354 static inline void free_part_stats(struct hd_struct *part)
355 {
356 }
357
358 #endif /* CONFIG_SMP */
359
360 #define part_stat_add(cpu, part, field, addnd) do { \
361 __part_stat_add((cpu), (part), field, addnd); \
362 if ((part)->partno) \
363 __part_stat_add((cpu), &part_to_disk((part))->part0, \
364 field, addnd); \
365 } while (0)
366
367 #define part_stat_dec(cpu, gendiskp, field) \
368 part_stat_add(cpu, gendiskp, field, -1)
369 #define part_stat_inc(cpu, gendiskp, field) \
370 part_stat_add(cpu, gendiskp, field, 1)
371 #define part_stat_sub(cpu, gendiskp, field, subnd) \
372 part_stat_add(cpu, gendiskp, field, -subnd)
373
374 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
375 {
376 atomic_inc(&part->in_flight[rw]);
377 if (part->partno)
378 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
379 }
380
381 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
382 {
383 atomic_dec(&part->in_flight[rw]);
384 if (part->partno)
385 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
386 }
387
388 static inline int part_in_flight(struct hd_struct *part)
389 {
390 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
391 }
392
393 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
394 {
395 if (disk)
396 return kzalloc_node(sizeof(struct partition_meta_info),
397 GFP_KERNEL, disk->node_id);
398 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
399 }
400
401 static inline void free_part_info(struct hd_struct *part)
402 {
403 kfree(part->info);
404 }
405
406 /* block/blk-core.c */
407 extern void part_round_stats(int cpu, struct hd_struct *part);
408
409 /* block/genhd.c */
410 extern void add_disk(struct gendisk *disk);
411 extern void del_gendisk(struct gendisk *gp);
412 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
413 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
414
415 extern void set_device_ro(struct block_device *bdev, int flag);
416 extern void set_disk_ro(struct gendisk *disk, int flag);
417
418 static inline int get_disk_ro(struct gendisk *disk)
419 {
420 return disk->part0.policy;
421 }
422
423 extern void disk_block_events(struct gendisk *disk);
424 extern void disk_unblock_events(struct gendisk *disk);
425 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
426 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
427
428 /* drivers/char/random.c */
429 extern void add_disk_randomness(struct gendisk *disk);
430 extern void rand_initialize_disk(struct gendisk *disk);
431
432 static inline sector_t get_start_sect(struct block_device *bdev)
433 {
434 return bdev->bd_part->start_sect;
435 }
436 static inline sector_t get_capacity(struct gendisk *disk)
437 {
438 return disk->part0.nr_sects;
439 }
440 static inline void set_capacity(struct gendisk *disk, sector_t size)
441 {
442 disk->part0.nr_sects = size;
443 }
444
445 #ifdef CONFIG_SOLARIS_X86_PARTITION
446
447 #define SOLARIS_X86_NUMSLICE 16
448 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
449
450 struct solaris_x86_slice {
451 __le16 s_tag; /* ID tag of partition */
452 __le16 s_flag; /* permission flags */
453 __le32 s_start; /* start sector no of partition */
454 __le32 s_size; /* # of blocks in partition */
455 };
456
457 struct solaris_x86_vtoc {
458 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
459 __le32 v_sanity; /* to verify vtoc sanity */
460 __le32 v_version; /* layout version */
461 char v_volume[8]; /* volume name */
462 __le16 v_sectorsz; /* sector size in bytes */
463 __le16 v_nparts; /* number of partitions */
464 unsigned int v_reserved[10]; /* free space */
465 struct solaris_x86_slice
466 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
467 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
468 char v_asciilabel[128]; /* for compatibility */
469 };
470
471 #endif /* CONFIG_SOLARIS_X86_PARTITION */
472
473 #ifdef CONFIG_BSD_DISKLABEL
474 /*
475 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
476 * updated by Marc Espie <Marc.Espie@openbsd.org>
477 */
478
479 /* check against BSD src/sys/sys/disklabel.h for consistency */
480
481 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
482 #define BSD_MAXPARTITIONS 16
483 #define OPENBSD_MAXPARTITIONS 16
484 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
485 struct bsd_disklabel {
486 __le32 d_magic; /* the magic number */
487 __s16 d_type; /* drive type */
488 __s16 d_subtype; /* controller/d_type specific */
489 char d_typename[16]; /* type name, e.g. "eagle" */
490 char d_packname[16]; /* pack identifier */
491 __u32 d_secsize; /* # of bytes per sector */
492 __u32 d_nsectors; /* # of data sectors per track */
493 __u32 d_ntracks; /* # of tracks per cylinder */
494 __u32 d_ncylinders; /* # of data cylinders per unit */
495 __u32 d_secpercyl; /* # of data sectors per cylinder */
496 __u32 d_secperunit; /* # of data sectors per unit */
497 __u16 d_sparespertrack; /* # of spare sectors per track */
498 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
499 __u32 d_acylinders; /* # of alt. cylinders per unit */
500 __u16 d_rpm; /* rotational speed */
501 __u16 d_interleave; /* hardware sector interleave */
502 __u16 d_trackskew; /* sector 0 skew, per track */
503 __u16 d_cylskew; /* sector 0 skew, per cylinder */
504 __u32 d_headswitch; /* head switch time, usec */
505 __u32 d_trkseek; /* track-to-track seek, usec */
506 __u32 d_flags; /* generic flags */
507 #define NDDATA 5
508 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
509 #define NSPARE 5
510 __u32 d_spare[NSPARE]; /* reserved for future use */
511 __le32 d_magic2; /* the magic number (again) */
512 __le16 d_checksum; /* xor of data incl. partitions */
513
514 /* filesystem and partition information: */
515 __le16 d_npartitions; /* number of partitions in following */
516 __le32 d_bbsize; /* size of boot area at sn0, bytes */
517 __le32 d_sbsize; /* max size of fs superblock, bytes */
518 struct bsd_partition { /* the partition table */
519 __le32 p_size; /* number of sectors in partition */
520 __le32 p_offset; /* starting sector */
521 __le32 p_fsize; /* filesystem basic fragment size */
522 __u8 p_fstype; /* filesystem type, see below */
523 __u8 p_frag; /* filesystem fragments per block */
524 __le16 p_cpg; /* filesystem cylinders per group */
525 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
526 };
527
528 #endif /* CONFIG_BSD_DISKLABEL */
529
530 #ifdef CONFIG_UNIXWARE_DISKLABEL
531 /*
532 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
533 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
534 */
535
536 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
537 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
538 #define UNIXWARE_NUMSLICE 16
539 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
540
541 struct unixware_slice {
542 __le16 s_label; /* label */
543 __le16 s_flags; /* permission flags */
544 __le32 start_sect; /* starting sector */
545 __le32 nr_sects; /* number of sectors in slice */
546 };
547
548 struct unixware_disklabel {
549 __le32 d_type; /* drive type */
550 __le32 d_magic; /* the magic number */
551 __le32 d_version; /* version number */
552 char d_serial[12]; /* serial number of the device */
553 __le32 d_ncylinders; /* # of data cylinders per device */
554 __le32 d_ntracks; /* # of tracks per cylinder */
555 __le32 d_nsectors; /* # of data sectors per track */
556 __le32 d_secsize; /* # of bytes per sector */
557 __le32 d_part_start; /* # of first sector of this partition */
558 __le32 d_unknown1[12]; /* ? */
559 __le32 d_alt_tbl; /* byte offset of alternate table */
560 __le32 d_alt_len; /* byte length of alternate table */
561 __le32 d_phys_cyl; /* # of physical cylinders per device */
562 __le32 d_phys_trk; /* # of physical tracks per cylinder */
563 __le32 d_phys_sec; /* # of physical sectors per track */
564 __le32 d_phys_bytes; /* # of physical bytes per sector */
565 __le32 d_unknown2; /* ? */
566 __le32 d_unknown3; /* ? */
567 __le32 d_pad[8]; /* pad */
568
569 struct unixware_vtoc {
570 __le32 v_magic; /* the magic number */
571 __le32 v_version; /* version number */
572 char v_name[8]; /* volume name */
573 __le16 v_nslices; /* # of slices */
574 __le16 v_unknown1; /* ? */
575 __le32 v_reserved[10]; /* reserved */
576 struct unixware_slice
577 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
578 } vtoc;
579
580 }; /* 408 */
581
582 #endif /* CONFIG_UNIXWARE_DISKLABEL */
583
584 #ifdef CONFIG_MINIX_SUBPARTITION
585 # define MINIX_NR_SUBPARTITIONS 4
586 #endif /* CONFIG_MINIX_SUBPARTITION */
587
588 #define ADDPART_FLAG_NONE 0
589 #define ADDPART_FLAG_RAID 1
590 #define ADDPART_FLAG_WHOLEDISK 2
591
592 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
593 extern void blk_free_devt(dev_t devt);
594 extern dev_t blk_lookup_devt(const char *name, int partno);
595 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
596
597 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
598 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
599 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
600 int partno, sector_t start,
601 sector_t len, int flags,
602 struct partition_meta_info
603 *info);
604 extern void __delete_partition(struct hd_struct *);
605 extern void delete_partition(struct gendisk *, int);
606 extern void printk_all_partitions(void);
607
608 extern struct gendisk *alloc_disk_node(int minors, int node_id);
609 extern struct gendisk *alloc_disk(int minors);
610 extern struct kobject *get_disk(struct gendisk *disk);
611 extern void put_disk(struct gendisk *disk);
612 extern void blk_register_region(dev_t devt, unsigned long range,
613 struct module *module,
614 struct kobject *(*probe)(dev_t, int *, void *),
615 int (*lock)(dev_t, void *),
616 void *data);
617 extern void blk_unregister_region(dev_t devt, unsigned long range);
618
619 extern ssize_t part_size_show(struct device *dev,
620 struct device_attribute *attr, char *buf);
621 extern ssize_t part_stat_show(struct device *dev,
622 struct device_attribute *attr, char *buf);
623 extern ssize_t part_inflight_show(struct device *dev,
624 struct device_attribute *attr, char *buf);
625 #ifdef CONFIG_FAIL_MAKE_REQUEST
626 extern ssize_t part_fail_show(struct device *dev,
627 struct device_attribute *attr, char *buf);
628 extern ssize_t part_fail_store(struct device *dev,
629 struct device_attribute *attr,
630 const char *buf, size_t count);
631 #endif /* CONFIG_FAIL_MAKE_REQUEST */
632
633 static inline void hd_ref_init(struct hd_struct *part)
634 {
635 atomic_set(&part->ref, 1);
636 smp_mb();
637 }
638
639 static inline void hd_struct_get(struct hd_struct *part)
640 {
641 atomic_inc(&part->ref);
642 smp_mb__after_atomic_inc();
643 }
644
645 static inline int hd_struct_try_get(struct hd_struct *part)
646 {
647 return atomic_inc_not_zero(&part->ref);
648 }
649
650 static inline void hd_struct_put(struct hd_struct *part)
651 {
652 if (atomic_dec_and_test(&part->ref))
653 __delete_partition(part);
654 }
655
656 #else /* CONFIG_BLOCK */
657
658 static inline void printk_all_partitions(void) { }
659
660 static inline dev_t blk_lookup_devt(const char *name, int partno)
661 {
662 dev_t devt = MKDEV(0, 0);
663 return devt;
664 }
665
666 #endif /* CONFIG_BLOCK */
667
668 #endif /* _LINUX_GENHD_H */
Linus' kernel tree