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