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1#ifndef _LINUX_GENHD_H
2#define _LINUX_GENHD_H
3
4/*
5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
7 * Drew Eckhardt
8 *
9 * <drew@colorado.edu>
10 */
11
12#include <linux/types.h>
13#include <linux/kdev_t.h>
14#include <linux/rcupdate.h>
15#include <linux/slab.h>
16
17#ifdef CONFIG_BLOCK
18
19#define 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#define alias_name(disk) ((disk)->alias ? (disk)->alias : \
25 (disk)->disk_name)
26
27extern struct device_type part_type;
28extern struct kobject *block_depr;
29extern struct class block_class;
30
31enum {
32/* These three have identical behaviour; use the second one if DOS FDISK gets
33 confused about extended/logical partitions starting past cylinder 1023. */
34 DOS_EXTENDED_PARTITION = 5,
35 LINUX_EXTENDED_PARTITION = 0x85,
36 WIN98_EXTENDED_PARTITION = 0x0f,
37
38 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
39
40 LINUX_SWAP_PARTITION = 0x82,
41 LINUX_DATA_PARTITION = 0x83,
42 LINUX_LVM_PARTITION = 0x8e,
43 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
44
45 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
46 NEW_SOLARIS_X86_PARTITION = 0xbf,
47
48 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
49 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
50 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
51 EZD_PARTITION = 0x55, /* EZ-DRIVE */
52
53 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
54 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
55 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
56 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
57 MINIX_PARTITION = 0x81, /* Minix Partition ID */
58 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
59};
60
61#define DISK_MAX_PARTS 256
62#define DISK_NAME_LEN 32
63#define ALIAS_LEN 256
64
65#include <linux/major.h>
66#include <linux/device.h>
67#include <linux/smp.h>
68#include <linux/string.h>
69#include <linux/fs.h>
70#include <linux/workqueue.h>
71
72struct partition {
73 unsigned char boot_ind; /* 0x80 - active */
74 unsigned char head; /* starting head */
75 unsigned char sector; /* starting sector */
76 unsigned char cyl; /* starting cylinder */
77 unsigned char sys_ind; /* What partition type */
78 unsigned char end_head; /* end head */
79 unsigned char end_sector; /* end sector */
80 unsigned char end_cyl; /* end cylinder */
81 __le32 start_sect; /* starting sector counting from 0 */
82 __le32 nr_sects; /* nr of sectors in partition */
83} __attribute__((packed));
84
85struct disk_stats {
86 unsigned long sectors[2]; /* READs and WRITEs */
87 unsigned long ios[2];
88 unsigned long merges[2];
89 unsigned long ticks[2];
90 unsigned long io_ticks;
91 unsigned long time_in_queue;
92};
93
94#define PARTITION_META_INFO_VOLNAMELTH 64
95#define PARTITION_META_INFO_UUIDLTH 16
96
97struct partition_meta_info {
98 u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */
99 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
100};
101
102struct hd_struct {
103 sector_t start_sect;
104 sector_t nr_sects;
105 sector_t alignment_offset;
106 unsigned int discard_alignment;
107 struct device __dev;
108 struct kobject *holder_dir;
109 int policy, partno;
110 struct partition_meta_info *info;
111#ifdef CONFIG_FAIL_MAKE_REQUEST
112 int make_it_fail;
113#endif
114 unsigned long stamp;
115 atomic_t in_flight[2];
116#ifdef CONFIG_SMP
117 struct disk_stats __percpu *dkstats;
118#else
119 struct disk_stats dkstats;
120#endif
121 atomic_t ref;
122 struct rcu_head rcu_head;
123};
124
125#define GENHD_FL_REMOVABLE 1
126/* 2 is unused */
127#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
128#define GENHD_FL_CD 8
129#define GENHD_FL_UP 16
130#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
131#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
132#define GENHD_FL_NATIVE_CAPACITY 128
133#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
134#define GENHD_FL_NO_PART_SCAN 512
135
136enum {
137 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
138 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
139};
140
141#define BLK_SCSI_MAX_CMDS (256)
142#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
143
144struct blk_scsi_cmd_filter {
145 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
146 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
147 struct kobject kobj;
148};
149
150struct disk_part_tbl {
151 struct rcu_head rcu_head;
152 int len;
153 struct hd_struct __rcu *last_lookup;
154 struct hd_struct __rcu *part[];
155};
156
157struct disk_events;
158
159struct gendisk {
160 /* major, first_minor and minors are input parameters only,
161 * don't use directly. Use disk_devt() and disk_max_parts().
162 */
163 int major; /* major number of driver */
164 int first_minor;
165 int minors; /* maximum number of minors, =1 for
166 * disks that can't be partitioned. */
167
168 char disk_name[DISK_NAME_LEN]; /* name of major driver */
169 char *alias; /* alias name of disk */
170 char *(*devnode)(struct gendisk *gd, mode_t *mode);
171
172 unsigned int events; /* supported events */
173 unsigned int async_events; /* async events, subset of all */
174
175 /* Array of pointers to partitions indexed by partno.
176 * Protected with matching bdev lock but stat and other
177 * non-critical accesses use RCU. Always access through
178 * helpers.
179 */
180 struct disk_part_tbl __rcu *part_tbl;
181 struct hd_struct part0;
182
183 const struct block_device_operations *fops;
184 struct request_queue *queue;
185 void *private_data;
186
187 int flags;
188 struct device *driverfs_dev; // FIXME: remove
189 struct kobject *slave_dir;
190
191 struct timer_rand_state *random;
192 atomic_t sync_io; /* RAID */
193 struct disk_events *ev;
194#ifdef CONFIG_BLK_DEV_INTEGRITY
195 struct blk_integrity *integrity;
196#endif
197 int node_id;
198};
199
200static inline struct gendisk *part_to_disk(struct hd_struct *part)
201{
202 if (likely(part)) {
203 if (part->partno)
204 return dev_to_disk(part_to_dev(part)->parent);
205 else
206 return dev_to_disk(part_to_dev(part));
207 }
208 return NULL;
209}
210
211static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
212{
213 int i;
214 for (i = 0; i < 16; ++i) {
215 *to++ = (hex_to_bin(*uuid_str) << 4) |
216 (hex_to_bin(*(uuid_str + 1)));
217 uuid_str += 2;
218 switch (i) {
219 case 3:
220 case 5:
221 case 7:
222 case 9:
223 uuid_str++;
224 continue;
225 }
226 }
227}
228
229static inline char *part_unpack_uuid(const u8 *uuid, char *out)
230{
231 sprintf(out, "%pU", uuid);
232 return out;
233}
234
235static inline int disk_max_parts(struct gendisk *disk)
236{
237 if (disk->flags & GENHD_FL_EXT_DEVT)
238 return DISK_MAX_PARTS;
239 return disk->minors;
240}
241
242static inline bool disk_part_scan_enabled(struct gendisk *disk)
243{
244 return disk_max_parts(disk) > 1 &&
245 !(disk->flags & GENHD_FL_NO_PART_SCAN);
246}
247
248static inline dev_t disk_devt(struct gendisk *disk)
249{
250 return disk_to_dev(disk)->devt;
251}
252
253static inline dev_t part_devt(struct hd_struct *part)
254{
255 return part_to_dev(part)->devt;
256}
257
258extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
259
260static inline void disk_put_part(struct hd_struct *part)
261{
262 if (likely(part))
263 put_device(part_to_dev(part));
264}
265
266/*
267 * Smarter partition iterator without context limits.
268 */
269#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
270#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
271#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
272#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
273
274struct disk_part_iter {
275 struct gendisk *disk;
276 struct hd_struct *part;
277 int idx;
278 unsigned int flags;
279};
280
281extern void disk_part_iter_init(struct disk_part_iter *piter,
282 struct gendisk *disk, unsigned int flags);
283extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
284extern void disk_part_iter_exit(struct disk_part_iter *piter);
285
286extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
287 sector_t sector);
288
289/*
290 * Macros to operate on percpu disk statistics:
291 *
292 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
293 * and should be called between disk_stat_lock() and
294 * disk_stat_unlock().
295 *
296 * part_stat_read() can be called at any time.
297 *
298 * part_stat_{add|set_all}() and {init|free}_part_stats are for
299 * internal use only.
300 */
301#ifdef CONFIG_SMP
302#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
303#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
304
305#define __part_stat_add(cpu, part, field, addnd) \
306 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
307
308#define part_stat_read(part, field) \
309({ \
310 typeof((part)->dkstats->field) res = 0; \
311 unsigned int _cpu; \
312 for_each_possible_cpu(_cpu) \
313 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
314 res; \
315})
316
317static inline void part_stat_set_all(struct hd_struct *part, int value)
318{
319 int i;
320
321 for_each_possible_cpu(i)
322 memset(per_cpu_ptr(part->dkstats, i), value,
323 sizeof(struct disk_stats));
324}
325
326static inline int init_part_stats(struct hd_struct *part)
327{
328 part->dkstats = alloc_percpu(struct disk_stats);
329 if (!part->dkstats)
330 return 0;
331 return 1;
332}
333
334static inline void free_part_stats(struct hd_struct *part)
335{
336 free_percpu(part->dkstats);
337}
338
339#else /* !CONFIG_SMP */
340#define part_stat_lock() ({ rcu_read_lock(); 0; })
341#define part_stat_unlock() rcu_read_unlock()
342
343#define __part_stat_add(cpu, part, field, addnd) \
344 ((part)->dkstats.field += addnd)
345
346#define part_stat_read(part, field) ((part)->dkstats.field)
347
348static inline void part_stat_set_all(struct hd_struct *part, int value)
349{
350 memset(&part->dkstats, value, sizeof(struct disk_stats));
351}
352
353static inline int init_part_stats(struct hd_struct *part)
354{
355 return 1;
356}
357
358static inline void free_part_stats(struct hd_struct *part)
359{
360}
361
362#endif /* CONFIG_SMP */
363
364#define part_stat_add(cpu, part, field, addnd) do { \
365 __part_stat_add((cpu), (part), field, addnd); \
366 if ((part)->partno) \
367 __part_stat_add((cpu), &part_to_disk((part))->part0, \
368 field, addnd); \
369} while (0)
370
371#define part_stat_dec(cpu, gendiskp, field) \
372 part_stat_add(cpu, gendiskp, field, -1)
373#define part_stat_inc(cpu, gendiskp, field) \
374 part_stat_add(cpu, gendiskp, field, 1)
375#define part_stat_sub(cpu, gendiskp, field, subnd) \
376 part_stat_add(cpu, gendiskp, field, -subnd)
377
378static inline void part_inc_in_flight(struct hd_struct *part, int rw)
379{
380 atomic_inc(&part->in_flight[rw]);
381 if (part->partno)
382 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
383}
384
385static inline void part_dec_in_flight(struct hd_struct *part, int rw)
386{
387 atomic_dec(&part->in_flight[rw]);
388 if (part->partno)
389 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
390}
391
392static inline int part_in_flight(struct hd_struct *part)
393{
394 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
395}
396
397static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
398{
399 if (disk)
400 return kzalloc_node(sizeof(struct partition_meta_info),
401 GFP_KERNEL, disk->node_id);
402 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
403}
404
405static inline void free_part_info(struct hd_struct *part)
406{
407 kfree(part->info);
408}
409
410/* block/blk-core.c */
411extern void part_round_stats(int cpu, struct hd_struct *part);
412
413/* block/genhd.c */
414extern void add_disk(struct gendisk *disk);
415extern void del_gendisk(struct gendisk *gp);
416extern struct gendisk *get_gendisk(dev_t dev, int *partno);
417extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
418
419extern void set_device_ro(struct block_device *bdev, int flag);
420extern void set_disk_ro(struct gendisk *disk, int flag);
421
422static inline int get_disk_ro(struct gendisk *disk)
423{
424 return disk->part0.policy;
425}
426
427extern void disk_block_events(struct gendisk *disk);
428extern void disk_unblock_events(struct gendisk *disk);
429extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
430extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
431
432/* drivers/char/random.c */
433extern void add_disk_randomness(struct gendisk *disk);
434extern void rand_initialize_disk(struct gendisk *disk);
435
436static inline sector_t get_start_sect(struct block_device *bdev)
437{
438 return bdev->bd_part->start_sect;
439}
440static inline sector_t get_capacity(struct gendisk *disk)
441{
442 return disk->part0.nr_sects;
443}
444static inline void set_capacity(struct gendisk *disk, sector_t size)
445{
446 disk->part0.nr_sects = size;
447}
448
449#ifdef CONFIG_SOLARIS_X86_PARTITION
450
451#define SOLARIS_X86_NUMSLICE 16
452#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
453
454struct solaris_x86_slice {
455 __le16 s_tag; /* ID tag of partition */
456 __le16 s_flag; /* permission flags */
457 __le32 s_start; /* start sector no of partition */
458 __le32 s_size; /* # of blocks in partition */
459};
460
461struct solaris_x86_vtoc {
462 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
463 __le32 v_sanity; /* to verify vtoc sanity */
464 __le32 v_version; /* layout version */
465 char v_volume[8]; /* volume name */
466 __le16 v_sectorsz; /* sector size in bytes */
467 __le16 v_nparts; /* number of partitions */
468 unsigned int v_reserved[10]; /* free space */
469 struct solaris_x86_slice
470 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
471 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
472 char v_asciilabel[128]; /* for compatibility */
473};
474
475#endif /* CONFIG_SOLARIS_X86_PARTITION */
476
477#ifdef CONFIG_BSD_DISKLABEL
478/*
479 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
480 * updated by Marc Espie <Marc.Espie@openbsd.org>
481 */
482
483/* check against BSD src/sys/sys/disklabel.h for consistency */
484
485#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
486#define BSD_MAXPARTITIONS 16
487#define OPENBSD_MAXPARTITIONS 16
488#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
489struct bsd_disklabel {
490 __le32 d_magic; /* the magic number */
491 __s16 d_type; /* drive type */
492 __s16 d_subtype; /* controller/d_type specific */
493 char d_typename[16]; /* type name, e.g. "eagle" */
494 char d_packname[16]; /* pack identifier */
495 __u32 d_secsize; /* # of bytes per sector */
496 __u32 d_nsectors; /* # of data sectors per track */
497 __u32 d_ntracks; /* # of tracks per cylinder */
498 __u32 d_ncylinders; /* # of data cylinders per unit */
499 __u32 d_secpercyl; /* # of data sectors per cylinder */
500 __u32 d_secperunit; /* # of data sectors per unit */
501 __u16 d_sparespertrack; /* # of spare sectors per track */
502 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
503 __u32 d_acylinders; /* # of alt. cylinders per unit */
504 __u16 d_rpm; /* rotational speed */
505 __u16 d_interleave; /* hardware sector interleave */
506 __u16 d_trackskew; /* sector 0 skew, per track */
507 __u16 d_cylskew; /* sector 0 skew, per cylinder */
508 __u32 d_headswitch; /* head switch time, usec */
509 __u32 d_trkseek; /* track-to-track seek, usec */
510 __u32 d_flags; /* generic flags */
511#define NDDATA 5
512 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
513#define NSPARE 5
514 __u32 d_spare[NSPARE]; /* reserved for future use */
515 __le32 d_magic2; /* the magic number (again) */
516 __le16 d_checksum; /* xor of data incl. partitions */
517
518 /* filesystem and partition information: */
519 __le16 d_npartitions; /* number of partitions in following */
520 __le32 d_bbsize; /* size of boot area at sn0, bytes */
521 __le32 d_sbsize; /* max size of fs superblock, bytes */
522 struct bsd_partition { /* the partition table */
523 __le32 p_size; /* number of sectors in partition */
524 __le32 p_offset; /* starting sector */
525 __le32 p_fsize; /* filesystem basic fragment size */
526 __u8 p_fstype; /* filesystem type, see below */
527 __u8 p_frag; /* filesystem fragments per block */
528 __le16 p_cpg; /* filesystem cylinders per group */
529 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
530};
531
532#endif /* CONFIG_BSD_DISKLABEL */
533
534#ifdef CONFIG_UNIXWARE_DISKLABEL
535/*
536 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
537 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
538 */
539
540#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
541#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
542#define UNIXWARE_NUMSLICE 16
543#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
544
545struct unixware_slice {
546 __le16 s_label; /* label */
547 __le16 s_flags; /* permission flags */
548 __le32 start_sect; /* starting sector */
549 __le32 nr_sects; /* number of sectors in slice */
550};
551
552struct unixware_disklabel {
553 __le32 d_type; /* drive type */
554 __le32 d_magic; /* the magic number */
555 __le32 d_version; /* version number */
556 char d_serial[12]; /* serial number of the device */
557 __le32 d_ncylinders; /* # of data cylinders per device */
558 __le32 d_ntracks; /* # of tracks per cylinder */
559 __le32 d_nsectors; /* # of data sectors per track */
560 __le32 d_secsize; /* # of bytes per sector */
561 __le32 d_part_start; /* # of first sector of this partition */
562 __le32 d_unknown1[12]; /* ? */
563 __le32 d_alt_tbl; /* byte offset of alternate table */
564 __le32 d_alt_len; /* byte length of alternate table */
565 __le32 d_phys_cyl; /* # of physical cylinders per device */
566 __le32 d_phys_trk; /* # of physical tracks per cylinder */
567 __le32 d_phys_sec; /* # of physical sectors per track */
568 __le32 d_phys_bytes; /* # of physical bytes per sector */
569 __le32 d_unknown2; /* ? */
570 __le32 d_unknown3; /* ? */
571 __le32 d_pad[8]; /* pad */
572
573 struct unixware_vtoc {
574 __le32 v_magic; /* the magic number */
575 __le32 v_version; /* version number */
576 char v_name[8]; /* volume name */
577 __le16 v_nslices; /* # of slices */
578 __le16 v_unknown1; /* ? */
579 __le32 v_reserved[10]; /* reserved */
580 struct unixware_slice
581 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
582 } vtoc;
583
584}; /* 408 */
585
586#endif /* CONFIG_UNIXWARE_DISKLABEL */
587
588#ifdef CONFIG_MINIX_SUBPARTITION
589# define MINIX_NR_SUBPARTITIONS 4
590#endif /* CONFIG_MINIX_SUBPARTITION */
591
592#define ADDPART_FLAG_NONE 0
593#define ADDPART_FLAG_RAID 1
594#define ADDPART_FLAG_WHOLEDISK 2
595
596extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
597extern void blk_free_devt(dev_t devt);
598extern dev_t blk_lookup_devt(const char *name, int partno);
599extern char *disk_name (struct gendisk *hd, int partno, char *buf);
600
601extern int disk_expand_part_tbl(struct gendisk *disk, int target);
602extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
603extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
604 int partno, sector_t start,
605 sector_t len, int flags,
606 struct partition_meta_info
607 *info);
608extern void __delete_partition(struct hd_struct *);
609extern void delete_partition(struct gendisk *, int);
610extern void printk_all_partitions(void);
611
612extern struct gendisk *alloc_disk_node(int minors, int node_id);
613extern struct gendisk *alloc_disk(int minors);
614extern struct kobject *get_disk(struct gendisk *disk);
615extern void put_disk(struct gendisk *disk);
616extern void blk_register_region(dev_t devt, unsigned long range,
617 struct module *module,
618 struct kobject *(*probe)(dev_t, int *, void *),
619 int (*lock)(dev_t, void *),
620 void *data);
621extern void blk_unregister_region(dev_t devt, unsigned long range);
622
623extern ssize_t part_size_show(struct device *dev,
624 struct device_attribute *attr, char *buf);
625extern ssize_t part_stat_show(struct device *dev,
626 struct device_attribute *attr, char *buf);
627extern ssize_t part_inflight_show(struct device *dev,
628 struct device_attribute *attr, char *buf);
629#ifdef CONFIG_FAIL_MAKE_REQUEST
630extern ssize_t part_fail_show(struct device *dev,
631 struct device_attribute *attr, char *buf);
632extern ssize_t part_fail_store(struct device *dev,
633 struct device_attribute *attr,
634 const char *buf, size_t count);
635#endif /* CONFIG_FAIL_MAKE_REQUEST */
636
637static inline void hd_ref_init(struct hd_struct *part)
638{
639 atomic_set(&part->ref, 1);
640 smp_mb();
641}
642
643static inline void hd_struct_get(struct hd_struct *part)
644{
645 atomic_inc(&part->ref);
646 smp_mb__after_atomic_inc();
647}
648
649static inline int hd_struct_try_get(struct hd_struct *part)
650{
651 return atomic_inc_not_zero(&part->ref);
652}
653
654static inline void hd_struct_put(struct hd_struct *part)
655{
656 if (atomic_dec_and_test(&part->ref))
657 __delete_partition(part);
658}
659
660#else /* CONFIG_BLOCK */
661
662static inline void printk_all_partitions(void) { }
663
664static inline dev_t blk_lookup_devt(const char *name, int partno)
665{
666 dev_t devt = MKDEV(0, 0);
667 return devt;
668}
669
670#endif /* CONFIG_BLOCK */
671
672#endif /* _LINUX_GENHD_H */