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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#include <linux/percpu-refcount.h>
17#include <linux/uuid.h>
18
19#ifdef CONFIG_BLOCK
20
21#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
22#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
23#define disk_to_dev(disk) (&(disk)->part0.__dev)
24#define part_to_dev(part) (&((part)->__dev))
25
26extern struct device_type part_type;
27extern struct kobject *block_depr;
28extern struct class block_class;
29
30enum {
31/* These three have identical behaviour; use the second one if DOS FDISK gets
32 confused about extended/logical partitions starting past cylinder 1023. */
33 DOS_EXTENDED_PARTITION = 5,
34 LINUX_EXTENDED_PARTITION = 0x85,
35 WIN98_EXTENDED_PARTITION = 0x0f,
36
37 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
38
39 LINUX_SWAP_PARTITION = 0x82,
40 LINUX_DATA_PARTITION = 0x83,
41 LINUX_LVM_PARTITION = 0x8e,
42 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
43
44 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
45 NEW_SOLARIS_X86_PARTITION = 0xbf,
46
47 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
48 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
49 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
50 EZD_PARTITION = 0x55, /* EZ-DRIVE */
51
52 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
53 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
54 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
55 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
56 MINIX_PARTITION = 0x81, /* Minix Partition ID */
57 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
58};
59
60#define DISK_MAX_PARTS 256
61#define DISK_NAME_LEN 32
62
63#include <linux/major.h>
64#include <linux/device.h>
65#include <linux/smp.h>
66#include <linux/string.h>
67#include <linux/fs.h>
68#include <linux/workqueue.h>
69
70struct partition {
71 unsigned char boot_ind; /* 0x80 - active */
72 unsigned char head; /* starting head */
73 unsigned char sector; /* starting sector */
74 unsigned char cyl; /* starting cylinder */
75 unsigned char sys_ind; /* What partition type */
76 unsigned char end_head; /* end head */
77 unsigned char end_sector; /* end sector */
78 unsigned char end_cyl; /* end cylinder */
79 __le32 start_sect; /* starting sector counting from 0 */
80 __le32 nr_sects; /* nr of sectors in partition */
81} __attribute__((packed));
82
83struct disk_stats {
84 unsigned long sectors[2]; /* READs and WRITEs */
85 unsigned long ios[2];
86 unsigned long merges[2];
87 unsigned long ticks[2];
88 unsigned long io_ticks;
89 unsigned long time_in_queue;
90};
91
92#define PARTITION_META_INFO_VOLNAMELTH 64
93/*
94 * Enough for the string representation of any kind of UUID plus NULL.
95 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
96 */
97#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
98
99struct partition_meta_info {
100 char uuid[PARTITION_META_INFO_UUIDLTH];
101 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
102};
103
104struct hd_struct {
105 sector_t start_sect;
106 /*
107 * nr_sects is protected by sequence counter. One might extend a
108 * partition while IO is happening to it and update of nr_sects
109 * can be non-atomic on 32bit machines with 64bit sector_t.
110 */
111 sector_t nr_sects;
112 seqcount_t nr_sects_seq;
113 sector_t alignment_offset;
114 unsigned int discard_alignment;
115 struct device __dev;
116 struct kobject *holder_dir;
117 int policy, partno;
118 struct partition_meta_info *info;
119#ifdef CONFIG_FAIL_MAKE_REQUEST
120 int make_it_fail;
121#endif
122 unsigned long stamp;
123 atomic_t in_flight[2];
124#ifdef CONFIG_SMP
125 struct disk_stats __percpu *dkstats;
126#else
127 struct disk_stats dkstats;
128#endif
129 struct percpu_ref ref;
130 struct rcu_head rcu_head;
131};
132
133#define GENHD_FL_REMOVABLE 1
134/* 2 is unused */
135#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
136#define GENHD_FL_CD 8
137#define GENHD_FL_UP 16
138#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
139#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
140#define GENHD_FL_NATIVE_CAPACITY 128
141#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
142#define GENHD_FL_NO_PART_SCAN 512
143
144enum {
145 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
146 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
147};
148
149struct disk_part_tbl {
150 struct rcu_head rcu_head;
151 int len;
152 struct hd_struct __rcu *last_lookup;
153 struct hd_struct __rcu *part[];
154};
155
156struct disk_events;
157struct badblocks;
158
159#if defined(CONFIG_BLK_DEV_INTEGRITY)
160
161struct blk_integrity {
162 struct blk_integrity_profile *profile;
163 unsigned char flags;
164 unsigned char tuple_size;
165 unsigned char interval_exp;
166 unsigned char tag_size;
167};
168
169#endif /* CONFIG_BLK_DEV_INTEGRITY */
170struct disk_devt {
171 atomic_t count;
172 void (*release)(struct disk_devt *disk_devt);
173};
174
175void put_disk_devt(struct disk_devt *disk_devt);
176void get_disk_devt(struct disk_devt *disk_devt);
177
178struct gendisk {
179 /* major, first_minor and minors are input parameters only,
180 * don't use directly. Use disk_devt() and disk_max_parts().
181 */
182 int major; /* major number of driver */
183 int first_minor;
184 int minors; /* maximum number of minors, =1 for
185 * disks that can't be partitioned. */
186 struct disk_devt *disk_devt;
187
188 char disk_name[DISK_NAME_LEN]; /* name of major driver */
189 char *(*devnode)(struct gendisk *gd, umode_t *mode);
190
191 unsigned int events; /* supported events */
192 unsigned int async_events; /* async events, subset of all */
193
194 /* Array of pointers to partitions indexed by partno.
195 * Protected with matching bdev lock but stat and other
196 * non-critical accesses use RCU. Always access through
197 * helpers.
198 */
199 struct disk_part_tbl __rcu *part_tbl;
200 struct hd_struct part0;
201
202 const struct block_device_operations *fops;
203 struct request_queue *queue;
204 void *private_data;
205
206 int flags;
207 struct kobject *slave_dir;
208
209 struct timer_rand_state *random;
210 atomic_t sync_io; /* RAID */
211 struct disk_events *ev;
212#ifdef CONFIG_BLK_DEV_INTEGRITY
213 struct kobject integrity_kobj;
214#endif /* CONFIG_BLK_DEV_INTEGRITY */
215 int node_id;
216 struct badblocks *bb;
217};
218
219static inline struct gendisk *part_to_disk(struct hd_struct *part)
220{
221 if (likely(part)) {
222 if (part->partno)
223 return dev_to_disk(part_to_dev(part)->parent);
224 else
225 return dev_to_disk(part_to_dev(part));
226 }
227 return NULL;
228}
229
230static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
231{
232 uuid_be_to_bin(uuid_str, (uuid_be *)to);
233 return 0;
234}
235
236static inline int disk_max_parts(struct gendisk *disk)
237{
238 if (disk->flags & GENHD_FL_EXT_DEVT)
239 return DISK_MAX_PARTS;
240 return disk->minors;
241}
242
243static inline bool disk_part_scan_enabled(struct gendisk *disk)
244{
245 return disk_max_parts(disk) > 1 &&
246 !(disk->flags & GENHD_FL_NO_PART_SCAN);
247}
248
249static inline dev_t disk_devt(struct gendisk *disk)
250{
251 return disk_to_dev(disk)->devt;
252}
253
254static inline dev_t part_devt(struct hd_struct *part)
255{
256 return part_to_dev(part)->devt;
257}
258
259extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
260
261static inline void disk_put_part(struct hd_struct *part)
262{
263 if (likely(part))
264 put_device(part_to_dev(part));
265}
266
267/*
268 * Smarter partition iterator without context limits.
269 */
270#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
271#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
272#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
273#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
274
275struct disk_part_iter {
276 struct gendisk *disk;
277 struct hd_struct *part;
278 int idx;
279 unsigned int flags;
280};
281
282extern void disk_part_iter_init(struct disk_part_iter *piter,
283 struct gendisk *disk, unsigned int flags);
284extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
285extern void disk_part_iter_exit(struct disk_part_iter *piter);
286
287extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
288 sector_t sector);
289
290/*
291 * Macros to operate on percpu disk statistics:
292 *
293 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
294 * and should be called between disk_stat_lock() and
295 * disk_stat_unlock().
296 *
297 * part_stat_read() can be called at any time.
298 *
299 * part_stat_{add|set_all}() and {init|free}_part_stats are for
300 * internal use only.
301 */
302#ifdef CONFIG_SMP
303#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
304#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
305
306#define __part_stat_add(cpu, part, field, addnd) \
307 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
308
309#define part_stat_read(part, field) \
310({ \
311 typeof((part)->dkstats->field) res = 0; \
312 unsigned int _cpu; \
313 for_each_possible_cpu(_cpu) \
314 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
315 res; \
316})
317
318static inline void part_stat_set_all(struct hd_struct *part, int value)
319{
320 int i;
321
322 for_each_possible_cpu(i)
323 memset(per_cpu_ptr(part->dkstats, i), value,
324 sizeof(struct disk_stats));
325}
326
327static inline int init_part_stats(struct hd_struct *part)
328{
329 part->dkstats = alloc_percpu(struct disk_stats);
330 if (!part->dkstats)
331 return 0;
332 return 1;
333}
334
335static inline void free_part_stats(struct hd_struct *part)
336{
337 free_percpu(part->dkstats);
338}
339
340#else /* !CONFIG_SMP */
341#define part_stat_lock() ({ rcu_read_lock(); 0; })
342#define part_stat_unlock() rcu_read_unlock()
343
344#define __part_stat_add(cpu, part, field, addnd) \
345 ((part)->dkstats.field += addnd)
346
347#define part_stat_read(part, field) ((part)->dkstats.field)
348
349static inline void part_stat_set_all(struct hd_struct *part, int value)
350{
351 memset(&part->dkstats, value, sizeof(struct disk_stats));
352}
353
354static inline int init_part_stats(struct hd_struct *part)
355{
356 return 1;
357}
358
359static inline void free_part_stats(struct hd_struct *part)
360{
361}
362
363#endif /* CONFIG_SMP */
364
365#define part_stat_add(cpu, part, field, addnd) do { \
366 __part_stat_add((cpu), (part), field, addnd); \
367 if ((part)->partno) \
368 __part_stat_add((cpu), &part_to_disk((part))->part0, \
369 field, addnd); \
370} while (0)
371
372#define part_stat_dec(cpu, gendiskp, field) \
373 part_stat_add(cpu, gendiskp, field, -1)
374#define part_stat_inc(cpu, gendiskp, field) \
375 part_stat_add(cpu, gendiskp, field, 1)
376#define part_stat_sub(cpu, gendiskp, field, subnd) \
377 part_stat_add(cpu, gendiskp, field, -subnd)
378
379static inline void part_inc_in_flight(struct hd_struct *part, int rw)
380{
381 atomic_inc(&part->in_flight[rw]);
382 if (part->partno)
383 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
384}
385
386static inline void part_dec_in_flight(struct hd_struct *part, int rw)
387{
388 atomic_dec(&part->in_flight[rw]);
389 if (part->partno)
390 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
391}
392
393static inline int part_in_flight(struct hd_struct *part)
394{
395 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
396}
397
398static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
399{
400 if (disk)
401 return kzalloc_node(sizeof(struct partition_meta_info),
402 GFP_KERNEL, disk->node_id);
403 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
404}
405
406static inline void free_part_info(struct hd_struct *part)
407{
408 kfree(part->info);
409}
410
411/* block/blk-core.c */
412extern void part_round_stats(int cpu, struct hd_struct *part);
413
414/* block/genhd.c */
415extern void device_add_disk(struct device *parent, struct gendisk *disk);
416static inline void add_disk(struct gendisk *disk)
417{
418 device_add_disk(NULL, disk);
419}
420
421extern void del_gendisk(struct gendisk *gp);
422extern struct gendisk *get_gendisk(dev_t dev, int *partno);
423extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
424
425extern void set_device_ro(struct block_device *bdev, int flag);
426extern void set_disk_ro(struct gendisk *disk, int flag);
427
428static inline int get_disk_ro(struct gendisk *disk)
429{
430 return disk->part0.policy;
431}
432
433extern void disk_block_events(struct gendisk *disk);
434extern void disk_unblock_events(struct gendisk *disk);
435extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
436extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
437
438/* drivers/char/random.c */
439extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
440extern void rand_initialize_disk(struct gendisk *disk);
441
442static inline sector_t get_start_sect(struct block_device *bdev)
443{
444 return bdev->bd_part->start_sect;
445}
446static inline sector_t get_capacity(struct gendisk *disk)
447{
448 return disk->part0.nr_sects;
449}
450static inline void set_capacity(struct gendisk *disk, sector_t size)
451{
452 disk->part0.nr_sects = size;
453}
454
455#ifdef CONFIG_SOLARIS_X86_PARTITION
456
457#define SOLARIS_X86_NUMSLICE 16
458#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
459
460struct solaris_x86_slice {
461 __le16 s_tag; /* ID tag of partition */
462 __le16 s_flag; /* permission flags */
463 __le32 s_start; /* start sector no of partition */
464 __le32 s_size; /* # of blocks in partition */
465};
466
467struct solaris_x86_vtoc {
468 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
469 __le32 v_sanity; /* to verify vtoc sanity */
470 __le32 v_version; /* layout version */
471 char v_volume[8]; /* volume name */
472 __le16 v_sectorsz; /* sector size in bytes */
473 __le16 v_nparts; /* number of partitions */
474 unsigned int v_reserved[10]; /* free space */
475 struct solaris_x86_slice
476 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
477 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
478 char v_asciilabel[128]; /* for compatibility */
479};
480
481#endif /* CONFIG_SOLARIS_X86_PARTITION */
482
483#ifdef CONFIG_BSD_DISKLABEL
484/*
485 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
486 * updated by Marc Espie <Marc.Espie@openbsd.org>
487 */
488
489/* check against BSD src/sys/sys/disklabel.h for consistency */
490
491#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
492#define BSD_MAXPARTITIONS 16
493#define OPENBSD_MAXPARTITIONS 16
494#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
495struct bsd_disklabel {
496 __le32 d_magic; /* the magic number */
497 __s16 d_type; /* drive type */
498 __s16 d_subtype; /* controller/d_type specific */
499 char d_typename[16]; /* type name, e.g. "eagle" */
500 char d_packname[16]; /* pack identifier */
501 __u32 d_secsize; /* # of bytes per sector */
502 __u32 d_nsectors; /* # of data sectors per track */
503 __u32 d_ntracks; /* # of tracks per cylinder */
504 __u32 d_ncylinders; /* # of data cylinders per unit */
505 __u32 d_secpercyl; /* # of data sectors per cylinder */
506 __u32 d_secperunit; /* # of data sectors per unit */
507 __u16 d_sparespertrack; /* # of spare sectors per track */
508 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
509 __u32 d_acylinders; /* # of alt. cylinders per unit */
510 __u16 d_rpm; /* rotational speed */
511 __u16 d_interleave; /* hardware sector interleave */
512 __u16 d_trackskew; /* sector 0 skew, per track */
513 __u16 d_cylskew; /* sector 0 skew, per cylinder */
514 __u32 d_headswitch; /* head switch time, usec */
515 __u32 d_trkseek; /* track-to-track seek, usec */
516 __u32 d_flags; /* generic flags */
517#define NDDATA 5
518 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
519#define NSPARE 5
520 __u32 d_spare[NSPARE]; /* reserved for future use */
521 __le32 d_magic2; /* the magic number (again) */
522 __le16 d_checksum; /* xor of data incl. partitions */
523
524 /* filesystem and partition information: */
525 __le16 d_npartitions; /* number of partitions in following */
526 __le32 d_bbsize; /* size of boot area at sn0, bytes */
527 __le32 d_sbsize; /* max size of fs superblock, bytes */
528 struct bsd_partition { /* the partition table */
529 __le32 p_size; /* number of sectors in partition */
530 __le32 p_offset; /* starting sector */
531 __le32 p_fsize; /* filesystem basic fragment size */
532 __u8 p_fstype; /* filesystem type, see below */
533 __u8 p_frag; /* filesystem fragments per block */
534 __le16 p_cpg; /* filesystem cylinders per group */
535 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
536};
537
538#endif /* CONFIG_BSD_DISKLABEL */
539
540#ifdef CONFIG_UNIXWARE_DISKLABEL
541/*
542 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
543 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
544 */
545
546#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
547#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
548#define UNIXWARE_NUMSLICE 16
549#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
550
551struct unixware_slice {
552 __le16 s_label; /* label */
553 __le16 s_flags; /* permission flags */
554 __le32 start_sect; /* starting sector */
555 __le32 nr_sects; /* number of sectors in slice */
556};
557
558struct unixware_disklabel {
559 __le32 d_type; /* drive type */
560 __le32 d_magic; /* the magic number */
561 __le32 d_version; /* version number */
562 char d_serial[12]; /* serial number of the device */
563 __le32 d_ncylinders; /* # of data cylinders per device */
564 __le32 d_ntracks; /* # of tracks per cylinder */
565 __le32 d_nsectors; /* # of data sectors per track */
566 __le32 d_secsize; /* # of bytes per sector */
567 __le32 d_part_start; /* # of first sector of this partition */
568 __le32 d_unknown1[12]; /* ? */
569 __le32 d_alt_tbl; /* byte offset of alternate table */
570 __le32 d_alt_len; /* byte length of alternate table */
571 __le32 d_phys_cyl; /* # of physical cylinders per device */
572 __le32 d_phys_trk; /* # of physical tracks per cylinder */
573 __le32 d_phys_sec; /* # of physical sectors per track */
574 __le32 d_phys_bytes; /* # of physical bytes per sector */
575 __le32 d_unknown2; /* ? */
576 __le32 d_unknown3; /* ? */
577 __le32 d_pad[8]; /* pad */
578
579 struct unixware_vtoc {
580 __le32 v_magic; /* the magic number */
581 __le32 v_version; /* version number */
582 char v_name[8]; /* volume name */
583 __le16 v_nslices; /* # of slices */
584 __le16 v_unknown1; /* ? */
585 __le32 v_reserved[10]; /* reserved */
586 struct unixware_slice
587 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
588 } vtoc;
589
590}; /* 408 */
591
592#endif /* CONFIG_UNIXWARE_DISKLABEL */
593
594#ifdef CONFIG_MINIX_SUBPARTITION
595# define MINIX_NR_SUBPARTITIONS 4
596#endif /* CONFIG_MINIX_SUBPARTITION */
597
598#define ADDPART_FLAG_NONE 0
599#define ADDPART_FLAG_RAID 1
600#define ADDPART_FLAG_WHOLEDISK 2
601
602extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
603extern void blk_free_devt(dev_t devt);
604extern dev_t blk_lookup_devt(const char *name, int partno);
605extern char *disk_name (struct gendisk *hd, int partno, char *buf);
606
607extern int disk_expand_part_tbl(struct gendisk *disk, int target);
608extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
609extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
610extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
611 int partno, sector_t start,
612 sector_t len, int flags,
613 struct partition_meta_info
614 *info);
615extern void __delete_partition(struct percpu_ref *);
616extern void delete_partition(struct gendisk *, int);
617extern void printk_all_partitions(void);
618
619extern struct gendisk *alloc_disk_node(int minors, int node_id);
620extern struct gendisk *alloc_disk(int minors);
621extern struct kobject *get_disk(struct gendisk *disk);
622extern void put_disk(struct gendisk *disk);
623extern void blk_register_region(dev_t devt, unsigned long range,
624 struct module *module,
625 struct kobject *(*probe)(dev_t, int *, void *),
626 int (*lock)(dev_t, void *),
627 void *data);
628extern void blk_unregister_region(dev_t devt, unsigned long range);
629
630extern ssize_t part_size_show(struct device *dev,
631 struct device_attribute *attr, char *buf);
632extern ssize_t part_stat_show(struct device *dev,
633 struct device_attribute *attr, char *buf);
634extern ssize_t part_inflight_show(struct device *dev,
635 struct device_attribute *attr, char *buf);
636#ifdef CONFIG_FAIL_MAKE_REQUEST
637extern ssize_t part_fail_show(struct device *dev,
638 struct device_attribute *attr, char *buf);
639extern ssize_t part_fail_store(struct device *dev,
640 struct device_attribute *attr,
641 const char *buf, size_t count);
642#endif /* CONFIG_FAIL_MAKE_REQUEST */
643
644static inline int hd_ref_init(struct hd_struct *part)
645{
646 if (percpu_ref_init(&part->ref, __delete_partition, 0,
647 GFP_KERNEL))
648 return -ENOMEM;
649 return 0;
650}
651
652static inline void hd_struct_get(struct hd_struct *part)
653{
654 percpu_ref_get(&part->ref);
655}
656
657static inline int hd_struct_try_get(struct hd_struct *part)
658{
659 return percpu_ref_tryget_live(&part->ref);
660}
661
662static inline void hd_struct_put(struct hd_struct *part)
663{
664 percpu_ref_put(&part->ref);
665}
666
667static inline void hd_struct_kill(struct hd_struct *part)
668{
669 percpu_ref_kill(&part->ref);
670}
671
672static inline void hd_free_part(struct hd_struct *part)
673{
674 free_part_stats(part);
675 free_part_info(part);
676 percpu_ref_exit(&part->ref);
677}
678
679/*
680 * Any access of part->nr_sects which is not protected by partition
681 * bd_mutex or gendisk bdev bd_mutex, should be done using this
682 * accessor function.
683 *
684 * Code written along the lines of i_size_read() and i_size_write().
685 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
686 * on.
687 */
688static inline sector_t part_nr_sects_read(struct hd_struct *part)
689{
690#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
691 sector_t nr_sects;
692 unsigned seq;
693 do {
694 seq = read_seqcount_begin(&part->nr_sects_seq);
695 nr_sects = part->nr_sects;
696 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
697 return nr_sects;
698#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
699 sector_t nr_sects;
700
701 preempt_disable();
702 nr_sects = part->nr_sects;
703 preempt_enable();
704 return nr_sects;
705#else
706 return part->nr_sects;
707#endif
708}
709
710/*
711 * Should be called with mutex lock held (typically bd_mutex) of partition
712 * to provide mutual exlusion among writers otherwise seqcount might be
713 * left in wrong state leaving the readers spinning infinitely.
714 */
715static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
716{
717#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
718 write_seqcount_begin(&part->nr_sects_seq);
719 part->nr_sects = size;
720 write_seqcount_end(&part->nr_sects_seq);
721#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
722 preempt_disable();
723 part->nr_sects = size;
724 preempt_enable();
725#else
726 part->nr_sects = size;
727#endif
728}
729
730#if defined(CONFIG_BLK_DEV_INTEGRITY)
731extern void blk_integrity_add(struct gendisk *);
732extern void blk_integrity_del(struct gendisk *);
733extern void blk_integrity_revalidate(struct gendisk *);
734#else /* CONFIG_BLK_DEV_INTEGRITY */
735static inline void blk_integrity_add(struct gendisk *disk) { }
736static inline void blk_integrity_del(struct gendisk *disk) { }
737static inline void blk_integrity_revalidate(struct gendisk *disk) { }
738#endif /* CONFIG_BLK_DEV_INTEGRITY */
739
740#else /* CONFIG_BLOCK */
741
742static inline void printk_all_partitions(void) { }
743
744static inline dev_t blk_lookup_devt(const char *name, int partno)
745{
746 dev_t devt = MKDEV(0, 0);
747 return devt;
748}
749
750static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
751{
752 return -EINVAL;
753}
754#endif /* CONFIG_BLOCK */
755
756#endif /* _LINUX_GENHD_H */
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