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