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