1#ifndef _LINUX_GENHD_H
2#define _LINUX_GENHD_H
3
4
5
6
7
8
9
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
32
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,
43
44 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
45 NEW_SOLARIS_X86_PARTITION = 0xbf,
46
47 DM6_AUX1PARTITION = 0x51,
48 DM6_AUX3PARTITION = 0x53,
49 DM6_PARTITION = 0x54,
50 EZD_PARTITION = 0x55,
51
52 FREEBSD_PARTITION = 0xa5,
53 OPENBSD_PARTITION = 0xa6,
54 NETBSD_PARTITION = 0xa9,
55 BSDI_PARTITION = 0xb7,
56 MINIX_PARTITION = 0x81,
57 UNIXWARE_PARTITION = 0x63,
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;
72 unsigned char head;
73 unsigned char sector;
74 unsigned char cyl;
75 unsigned char sys_ind;
76 unsigned char end_head;
77 unsigned char end_sector;
78 unsigned char end_cyl;
79 __le32 start_sect;
80 __le32 nr_sects;
81} __attribute__((packed));
82
83struct disk_stats {
84 unsigned long sectors[2];
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
95
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
108
109
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
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
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,
146 DISK_EVENT_EJECT_REQUEST = 1 << 1,
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 const 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
170
171struct gendisk {
172
173
174
175 int major;
176 int first_minor;
177 int minors;
178
179
180 char disk_name[DISK_NAME_LEN];
181 char *(*devnode)(struct gendisk *gd, umode_t *mode);
182
183 unsigned int events;
184 unsigned int async_events;
185
186
187
188
189
190
191 struct disk_part_tbl __rcu *part_tbl;
192 struct hd_struct part0;
193
194 const struct block_device_operations *fops;
195 struct request_queue *queue;
196 void *private_data;
197
198 int flags;
199 struct kobject *slave_dir;
200
201 struct timer_rand_state *random;
202 atomic_t sync_io;
203 struct disk_events *ev;
204#ifdef CONFIG_BLK_DEV_INTEGRITY
205 struct kobject integrity_kobj;
206#endif
207 int node_id;
208 struct badblocks *bb;
209};
210
211static inline struct gendisk *part_to_disk(struct hd_struct *part)
212{
213 if (likely(part)) {
214 if (part->partno)
215 return dev_to_disk(part_to_dev(part)->parent);
216 else
217 return dev_to_disk(part_to_dev(part));
218 }
219 return NULL;
220}
221
222static inline int disk_max_parts(struct gendisk *disk)
223{
224 if (disk->flags & GENHD_FL_EXT_DEVT)
225 return DISK_MAX_PARTS;
226 return disk->minors;
227}
228
229static inline bool disk_part_scan_enabled(struct gendisk *disk)
230{
231 return disk_max_parts(disk) > 1 &&
232 !(disk->flags & GENHD_FL_NO_PART_SCAN);
233}
234
235static inline dev_t disk_devt(struct gendisk *disk)
236{
237 return disk_to_dev(disk)->devt;
238}
239
240static inline dev_t part_devt(struct hd_struct *part)
241{
242 return part_to_dev(part)->devt;
243}
244
245extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
246
247static inline void disk_put_part(struct hd_struct *part)
248{
249 if (likely(part))
250 put_device(part_to_dev(part));
251}
252
253
254
255
256#define DISK_PITER_REVERSE (1 << 0)
257#define DISK_PITER_INCL_EMPTY (1 << 1)
258#define DISK_PITER_INCL_PART0 (1 << 2)
259#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3)
260
261struct disk_part_iter {
262 struct gendisk *disk;
263 struct hd_struct *part;
264 int idx;
265 unsigned int flags;
266};
267
268extern void disk_part_iter_init(struct disk_part_iter *piter,
269 struct gendisk *disk, unsigned int flags);
270extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
271extern void disk_part_iter_exit(struct disk_part_iter *piter);
272
273extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
274 sector_t sector);
275
276
277
278
279
280
281
282
283
284
285
286
287
288#ifdef CONFIG_SMP
289#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
290#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
291
292#define __part_stat_add(cpu, part, field, addnd) \
293 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
294
295#define part_stat_read(part, field) \
296({ \
297 typeof((part)->dkstats->field) res = 0; \
298 unsigned int _cpu; \
299 for_each_possible_cpu(_cpu) \
300 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
301 res; \
302})
303
304static inline void part_stat_set_all(struct hd_struct *part, int value)
305{
306 int i;
307
308 for_each_possible_cpu(i)
309 memset(per_cpu_ptr(part->dkstats, i), value,
310 sizeof(struct disk_stats));
311}
312
313static inline int init_part_stats(struct hd_struct *part)
314{
315 part->dkstats = alloc_percpu(struct disk_stats);
316 if (!part->dkstats)
317 return 0;
318 return 1;
319}
320
321static inline void free_part_stats(struct hd_struct *part)
322{
323 free_percpu(part->dkstats);
324}
325
326#else
327#define part_stat_lock() ({ rcu_read_lock(); 0; })
328#define part_stat_unlock() rcu_read_unlock()
329
330#define __part_stat_add(cpu, part, field, addnd) \
331 ((part)->dkstats.field += addnd)
332
333#define part_stat_read(part, field) ((part)->dkstats.field)
334
335static inline void part_stat_set_all(struct hd_struct *part, int value)
336{
337 memset(&part->dkstats, value, sizeof(struct disk_stats));
338}
339
340static inline int init_part_stats(struct hd_struct *part)
341{
342 return 1;
343}
344
345static inline void free_part_stats(struct hd_struct *part)
346{
347}
348
349#endif
350
351#define part_stat_add(cpu, part, field, addnd) do { \
352 __part_stat_add((cpu), (part), field, addnd); \
353 if ((part)->partno) \
354 __part_stat_add((cpu), &part_to_disk((part))->part0, \
355 field, addnd); \
356} while (0)
357
358#define part_stat_dec(cpu, gendiskp, field) \
359 part_stat_add(cpu, gendiskp, field, -1)
360#define part_stat_inc(cpu, gendiskp, field) \
361 part_stat_add(cpu, gendiskp, field, 1)
362#define part_stat_sub(cpu, gendiskp, field, subnd) \
363 part_stat_add(cpu, gendiskp, field, -subnd)
364
365static inline void part_inc_in_flight(struct hd_struct *part, int rw)
366{
367 atomic_inc(&part->in_flight[rw]);
368 if (part->partno)
369 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
370}
371
372static inline void part_dec_in_flight(struct hd_struct *part, int rw)
373{
374 atomic_dec(&part->in_flight[rw]);
375 if (part->partno)
376 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
377}
378
379static inline int part_in_flight(struct hd_struct *part)
380{
381 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
382}
383
384static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
385{
386 if (disk)
387 return kzalloc_node(sizeof(struct partition_meta_info),
388 GFP_KERNEL, disk->node_id);
389 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
390}
391
392static inline void free_part_info(struct hd_struct *part)
393{
394 kfree(part->info);
395}
396
397
398extern void part_round_stats(int cpu, struct hd_struct *part);
399
400
401extern void device_add_disk(struct device *parent, struct gendisk *disk);
402static inline void add_disk(struct gendisk *disk)
403{
404 device_add_disk(NULL, disk);
405}
406
407extern void del_gendisk(struct gendisk *gp);
408extern struct gendisk *get_gendisk(dev_t dev, int *partno);
409extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
410
411extern void set_device_ro(struct block_device *bdev, int flag);
412extern void set_disk_ro(struct gendisk *disk, int flag);
413
414static inline int get_disk_ro(struct gendisk *disk)
415{
416 return disk->part0.policy;
417}
418
419extern void disk_block_events(struct gendisk *disk);
420extern void disk_unblock_events(struct gendisk *disk);
421extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
422extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
423
424
425extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
426extern void rand_initialize_disk(struct gendisk *disk);
427
428static inline sector_t get_start_sect(struct block_device *bdev)
429{
430 return bdev->bd_part->start_sect;
431}
432static inline sector_t get_capacity(struct gendisk *disk)
433{
434 return disk->part0.nr_sects;
435}
436static inline void set_capacity(struct gendisk *disk, sector_t size)
437{
438 disk->part0.nr_sects = size;
439}
440
441#ifdef CONFIG_SOLARIS_X86_PARTITION
442
443#define SOLARIS_X86_NUMSLICE 16
444#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
445
446struct solaris_x86_slice {
447 __le16 s_tag;
448 __le16 s_flag;
449 __le32 s_start;
450 __le32 s_size;
451};
452
453struct solaris_x86_vtoc {
454 unsigned int v_bootinfo[3];
455 __le32 v_sanity;
456 __le32 v_version;
457 char v_volume[8];
458 __le16 v_sectorsz;
459 __le16 v_nparts;
460 unsigned int v_reserved[10];
461 struct solaris_x86_slice
462 v_slice[SOLARIS_X86_NUMSLICE];
463 unsigned int timestamp[SOLARIS_X86_NUMSLICE];
464 char v_asciilabel[128];
465};
466
467#endif
468
469#ifdef CONFIG_BSD_DISKLABEL
470
471
472
473
474
475
476
477#define BSD_DISKMAGIC (0x82564557UL)
478#define BSD_MAXPARTITIONS 16
479#define OPENBSD_MAXPARTITIONS 16
480#define BSD_FS_UNUSED 0
481struct bsd_disklabel {
482 __le32 d_magic;
483 __s16 d_type;
484 __s16 d_subtype;
485 char d_typename[16];
486 char d_packname[16];
487 __u32 d_secsize;
488 __u32 d_nsectors;
489 __u32 d_ntracks;
490 __u32 d_ncylinders;
491 __u32 d_secpercyl;
492 __u32 d_secperunit;
493 __u16 d_sparespertrack;
494 __u16 d_sparespercyl;
495 __u32 d_acylinders;
496 __u16 d_rpm;
497 __u16 d_interleave;
498 __u16 d_trackskew;
499 __u16 d_cylskew;
500 __u32 d_headswitch;
501 __u32 d_trkseek;
502 __u32 d_flags;
503#define NDDATA 5
504 __u32 d_drivedata[NDDATA];
505#define NSPARE 5
506 __u32 d_spare[NSPARE];
507 __le32 d_magic2;
508 __le16 d_checksum;
509
510
511 __le16 d_npartitions;
512 __le32 d_bbsize;
513 __le32 d_sbsize;
514 struct bsd_partition {
515 __le32 p_size;
516 __le32 p_offset;
517 __le32 p_fsize;
518 __u8 p_fstype;
519 __u8 p_frag;
520 __le16 p_cpg;
521 } d_partitions[BSD_MAXPARTITIONS];
522};
523
524#endif
525
526#ifdef CONFIG_UNIXWARE_DISKLABEL
527
528
529
530
531
532#define UNIXWARE_DISKMAGIC (0xCA5E600DUL)
533#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL)
534#define UNIXWARE_NUMSLICE 16
535#define UNIXWARE_FS_UNUSED 0
536
537struct unixware_slice {
538 __le16 s_label;
539 __le16 s_flags;
540 __le32 start_sect;
541 __le32 nr_sects;
542};
543
544struct unixware_disklabel {
545 __le32 d_type;
546 __le32 d_magic;
547 __le32 d_version;
548 char d_serial[12];
549 __le32 d_ncylinders;
550 __le32 d_ntracks;
551 __le32 d_nsectors;
552 __le32 d_secsize;
553 __le32 d_part_start;
554 __le32 d_unknown1[12];
555 __le32 d_alt_tbl;
556 __le32 d_alt_len;
557 __le32 d_phys_cyl;
558 __le32 d_phys_trk;
559 __le32 d_phys_sec;
560 __le32 d_phys_bytes;
561 __le32 d_unknown2;
562 __le32 d_unknown3;
563 __le32 d_pad[8];
564
565 struct unixware_vtoc {
566 __le32 v_magic;
567 __le32 v_version;
568 char v_name[8];
569 __le16 v_nslices;
570 __le16 v_unknown1;
571 __le32 v_reserved[10];
572 struct unixware_slice
573 v_slice[UNIXWARE_NUMSLICE];
574 } vtoc;
575
576};
577
578#endif
579
580#ifdef CONFIG_MINIX_SUBPARTITION
581# define MINIX_NR_SUBPARTITIONS 4
582#endif
583
584#define ADDPART_FLAG_NONE 0
585#define ADDPART_FLAG_RAID 1
586#define ADDPART_FLAG_WHOLEDISK 2
587
588extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
589extern void blk_free_devt(dev_t devt);
590extern dev_t blk_lookup_devt(const char *name, int partno);
591extern char *disk_name (struct gendisk *hd, int partno, char *buf);
592
593extern int disk_expand_part_tbl(struct gendisk *disk, int target);
594extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
595extern int invalidate_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 percpu_ref *);
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
629
630static inline int hd_ref_init(struct hd_struct *part)
631{
632 if (percpu_ref_init(&part->ref, __delete_partition, 0,
633 GFP_KERNEL))
634 return -ENOMEM;
635 return 0;
636}
637
638static inline void hd_struct_get(struct hd_struct *part)
639{
640 percpu_ref_get(&part->ref);
641}
642
643static inline int hd_struct_try_get(struct hd_struct *part)
644{
645 return percpu_ref_tryget_live(&part->ref);
646}
647
648static inline void hd_struct_put(struct hd_struct *part)
649{
650 percpu_ref_put(&part->ref);
651}
652
653static inline void hd_struct_kill(struct hd_struct *part)
654{
655 percpu_ref_kill(&part->ref);
656}
657
658static inline void hd_free_part(struct hd_struct *part)
659{
660 free_part_stats(part);
661 free_part_info(part);
662 percpu_ref_exit(&part->ref);
663}
664
665
666
667
668
669
670
671
672
673
674static inline sector_t part_nr_sects_read(struct hd_struct *part)
675{
676#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
677 sector_t nr_sects;
678 unsigned seq;
679 do {
680 seq = read_seqcount_begin(&part->nr_sects_seq);
681 nr_sects = part->nr_sects;
682 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
683 return nr_sects;
684#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
685 sector_t nr_sects;
686
687 preempt_disable();
688 nr_sects = part->nr_sects;
689 preempt_enable();
690 return nr_sects;
691#else
692 return part->nr_sects;
693#endif
694}
695
696
697
698
699
700
701static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
702{
703#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
704 write_seqcount_begin(&part->nr_sects_seq);
705 part->nr_sects = size;
706 write_seqcount_end(&part->nr_sects_seq);
707#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
708 preempt_disable();
709 part->nr_sects = size;
710 preempt_enable();
711#else
712 part->nr_sects = size;
713#endif
714}
715
716#if defined(CONFIG_BLK_DEV_INTEGRITY)
717extern void blk_integrity_add(struct gendisk *);
718extern void blk_integrity_del(struct gendisk *);
719#else
720static inline void blk_integrity_add(struct gendisk *disk) { }
721static inline void blk_integrity_del(struct gendisk *disk) { }
722#endif
723
724#else
725
726static inline void printk_all_partitions(void) { }
727
728static inline dev_t blk_lookup_devt(const char *name, int partno)
729{
730 dev_t devt = MKDEV(0, 0);
731 return devt;
732}
733#endif
734
735#endif
736