1
2#ifndef _LINUX_GENHD_H
3#define _LINUX_GENHD_H
4
5
6
7
8
9
10
11
12
13#include <linux/types.h>
14#include <linux/kdev_t.h>
15#include <linux/rcupdate.h>
16#include <linux/slab.h>
17#include <linux/percpu-refcount.h>
18#include <linux/uuid.h>
19#include <linux/blk_types.h>
20
21#ifdef CONFIG_BLOCK
22
23#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
24#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
25#define disk_to_dev(disk) (&(disk)->part0.__dev)
26#define part_to_dev(part) (&((part)->__dev))
27
28extern struct device_type part_type;
29extern struct kobject *block_depr;
30extern struct class block_class;
31
32enum {
33
34
35 DOS_EXTENDED_PARTITION = 5,
36 LINUX_EXTENDED_PARTITION = 0x85,
37 WIN98_EXTENDED_PARTITION = 0x0f,
38
39 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
40
41 LINUX_SWAP_PARTITION = 0x82,
42 LINUX_DATA_PARTITION = 0x83,
43 LINUX_LVM_PARTITION = 0x8e,
44 LINUX_RAID_PARTITION = 0xfd,
45
46 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
47 NEW_SOLARIS_X86_PARTITION = 0xbf,
48
49 DM6_AUX1PARTITION = 0x51,
50 DM6_AUX3PARTITION = 0x53,
51 DM6_PARTITION = 0x54,
52 EZD_PARTITION = 0x55,
53
54 FREEBSD_PARTITION = 0xa5,
55 OPENBSD_PARTITION = 0xa6,
56 NETBSD_PARTITION = 0xa9,
57 BSDI_PARTITION = 0xb7,
58 MINIX_PARTITION = 0x81,
59 UNIXWARE_PARTITION = 0x63,
60};
61
62#define DISK_MAX_PARTS 256
63#define DISK_NAME_LEN 32
64
65#include <linux/major.h>
66#include <linux/device.h>
67#include <linux/smp.h>
68#include <linux/string.h>
69#include <linux/fs.h>
70#include <linux/workqueue.h>
71
72struct partition {
73 unsigned char boot_ind;
74 unsigned char head;
75 unsigned char sector;
76 unsigned char cyl;
77 unsigned char sys_ind;
78 unsigned char end_head;
79 unsigned char end_sector;
80 unsigned char end_cyl;
81 __le32 start_sect;
82 __le32 nr_sects;
83} __attribute__((packed));
84
85struct disk_stats {
86 u64 nsecs[NR_STAT_GROUPS];
87 unsigned long sectors[NR_STAT_GROUPS];
88 unsigned long ios[NR_STAT_GROUPS];
89 unsigned long merges[NR_STAT_GROUPS];
90 unsigned long io_ticks;
91 unsigned long time_in_queue;
92};
93
94#define PARTITION_META_INFO_VOLNAMELTH 64
95
96
97
98
99#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
100
101struct partition_meta_info {
102 char uuid[PARTITION_META_INFO_UUIDLTH];
103 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
104};
105
106struct hd_struct {
107 sector_t start_sect;
108
109
110
111
112
113 sector_t nr_sects;
114 seqcount_t nr_sects_seq;
115 sector_t alignment_offset;
116 unsigned int discard_alignment;
117 struct device __dev;
118 struct kobject *holder_dir;
119 int policy, partno;
120 struct partition_meta_info *info;
121#ifdef CONFIG_FAIL_MAKE_REQUEST
122 int make_it_fail;
123#endif
124 unsigned long stamp;
125 atomic_t in_flight[2];
126#ifdef CONFIG_SMP
127 struct disk_stats __percpu *dkstats;
128#else
129 struct disk_stats dkstats;
130#endif
131 struct percpu_ref ref;
132 struct rcu_head rcu_head;
133};
134
135#define GENHD_FL_REMOVABLE 1
136
137#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
138#define GENHD_FL_CD 8
139#define GENHD_FL_UP 16
140#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
141#define GENHD_FL_EXT_DEVT 64
142#define GENHD_FL_NATIVE_CAPACITY 128
143#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
144#define GENHD_FL_NO_PART_SCAN 512
145#define GENHD_FL_HIDDEN 1024
146
147enum {
148 DISK_EVENT_MEDIA_CHANGE = 1 << 0,
149 DISK_EVENT_EJECT_REQUEST = 1 << 1,
150};
151
152struct disk_part_tbl {
153 struct rcu_head rcu_head;
154 int len;
155 struct hd_struct __rcu *last_lookup;
156 struct hd_struct __rcu *part[];
157};
158
159struct disk_events;
160struct badblocks;
161
162#if defined(CONFIG_BLK_DEV_INTEGRITY)
163
164struct blk_integrity {
165 const struct blk_integrity_profile *profile;
166 unsigned char flags;
167 unsigned char tuple_size;
168 unsigned char interval_exp;
169 unsigned char tag_size;
170};
171
172#endif
173
174struct gendisk {
175
176
177
178 int major;
179 int first_minor;
180 int minors;
181
182
183 char disk_name[DISK_NAME_LEN];
184 char *(*devnode)(struct gendisk *gd, umode_t *mode);
185
186 unsigned int events;
187 unsigned int async_events;
188
189
190
191
192
193
194 struct disk_part_tbl __rcu *part_tbl;
195 struct hd_struct part0;
196
197 const struct block_device_operations *fops;
198 struct request_queue *queue;
199 void *private_data;
200
201 int flags;
202 struct rw_semaphore lookup_sem;
203 struct kobject *slave_dir;
204
205 struct timer_rand_state *random;
206 atomic_t sync_io;
207 struct disk_events *ev;
208#ifdef CONFIG_BLK_DEV_INTEGRITY
209 struct kobject integrity_kobj;
210#endif
211 int node_id;
212 struct badblocks *bb;
213 struct lockdep_map lockdep_map;
214};
215
216static inline struct gendisk *part_to_disk(struct hd_struct *part)
217{
218 if (likely(part)) {
219 if (part->partno)
220 return dev_to_disk(part_to_dev(part)->parent);
221 else
222 return dev_to_disk(part_to_dev(part));
223 }
224 return NULL;
225}
226
227static inline int disk_max_parts(struct gendisk *disk)
228{
229 if (disk->flags & GENHD_FL_EXT_DEVT)
230 return DISK_MAX_PARTS;
231 return disk->minors;
232}
233
234static inline bool disk_part_scan_enabled(struct gendisk *disk)
235{
236 return disk_max_parts(disk) > 1 &&
237 !(disk->flags & GENHD_FL_NO_PART_SCAN);
238}
239
240static inline dev_t disk_devt(struct gendisk *disk)
241{
242 return MKDEV(disk->major, disk->first_minor);
243}
244
245static inline dev_t part_devt(struct hd_struct *part)
246{
247 return part_to_dev(part)->devt;
248}
249
250extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
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
261
262#define DISK_PITER_REVERSE (1 << 0)
263#define DISK_PITER_INCL_EMPTY (1 << 1)
264#define DISK_PITER_INCL_PART0 (1 << 2)
265#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3)
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
284
285
286
287
288
289
290
291
292
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
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
356
357#define part_stat_read_msecs(part, which) \
358 div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC)
359
360#define part_stat_read_accum(part, field) \
361 (part_stat_read(part, field[STAT_READ]) + \
362 part_stat_read(part, field[STAT_WRITE]) + \
363 part_stat_read(part, field[STAT_DISCARD]))
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
379void part_in_flight(struct request_queue *q, struct hd_struct *part,
380 unsigned int inflight[2]);
381void part_in_flight_rw(struct request_queue *q, struct hd_struct *part,
382 unsigned int inflight[2]);
383void part_dec_in_flight(struct request_queue *q, struct hd_struct *part,
384 int rw);
385void part_inc_in_flight(struct request_queue *q, struct hd_struct *part,
386 int rw);
387
388static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
389{
390 if (disk)
391 return kzalloc_node(sizeof(struct partition_meta_info),
392 GFP_KERNEL, disk->node_id);
393 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
394}
395
396static inline void free_part_info(struct hd_struct *part)
397{
398 kfree(part->info);
399}
400
401
402extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part);
403
404
405extern void device_add_disk(struct device *parent, struct gendisk *disk);
406static inline void add_disk(struct gendisk *disk)
407{
408 device_add_disk(NULL, disk);
409}
410extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
411static inline void add_disk_no_queue_reg(struct gendisk *disk)
412{
413 device_add_disk_no_queue_reg(NULL, disk);
414}
415
416extern void del_gendisk(struct gendisk *gp);
417extern struct gendisk *get_gendisk(dev_t dev, int *partno);
418extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
419
420extern void set_device_ro(struct block_device *bdev, int flag);
421extern void set_disk_ro(struct gendisk *disk, int flag);
422
423static inline int get_disk_ro(struct gendisk *disk)
424{
425 return disk->part0.policy;
426}
427
428extern void disk_block_events(struct gendisk *disk);
429extern void disk_unblock_events(struct gendisk *disk);
430extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
431extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
432
433
434extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
435extern void rand_initialize_disk(struct gendisk *disk);
436
437static inline sector_t get_start_sect(struct block_device *bdev)
438{
439 return bdev->bd_part->start_sect;
440}
441static inline sector_t get_capacity(struct gendisk *disk)
442{
443 return disk->part0.nr_sects;
444}
445static inline void set_capacity(struct gendisk *disk, sector_t size)
446{
447 disk->part0.nr_sects = size;
448}
449
450#ifdef CONFIG_SOLARIS_X86_PARTITION
451
452#define SOLARIS_X86_NUMSLICE 16
453#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
454
455struct solaris_x86_slice {
456 __le16 s_tag;
457 __le16 s_flag;
458 __le32 s_start;
459 __le32 s_size;
460};
461
462struct solaris_x86_vtoc {
463 unsigned int v_bootinfo[3];
464 __le32 v_sanity;
465 __le32 v_version;
466 char v_volume[8];
467 __le16 v_sectorsz;
468 __le16 v_nparts;
469 unsigned int v_reserved[10];
470 struct solaris_x86_slice
471 v_slice[SOLARIS_X86_NUMSLICE];
472 unsigned int timestamp[SOLARIS_X86_NUMSLICE];
473 char v_asciilabel[128];
474};
475
476#endif
477
478#ifdef CONFIG_BSD_DISKLABEL
479
480
481
482
483
484
485
486#define BSD_DISKMAGIC (0x82564557UL)
487#define BSD_MAXPARTITIONS 16
488#define OPENBSD_MAXPARTITIONS 16
489#define BSD_FS_UNUSED 0
490struct bsd_disklabel {
491 __le32 d_magic;
492 __s16 d_type;
493 __s16 d_subtype;
494 char d_typename[16];
495 char d_packname[16];
496 __u32 d_secsize;
497 __u32 d_nsectors;
498 __u32 d_ntracks;
499 __u32 d_ncylinders;
500 __u32 d_secpercyl;
501 __u32 d_secperunit;
502 __u16 d_sparespertrack;
503 __u16 d_sparespercyl;
504 __u32 d_acylinders;
505 __u16 d_rpm;
506 __u16 d_interleave;
507 __u16 d_trackskew;
508 __u16 d_cylskew;
509 __u32 d_headswitch;
510 __u32 d_trkseek;
511 __u32 d_flags;
512#define NDDATA 5
513 __u32 d_drivedata[NDDATA];
514#define NSPARE 5
515 __u32 d_spare[NSPARE];
516 __le32 d_magic2;
517 __le16 d_checksum;
518
519
520 __le16 d_npartitions;
521 __le32 d_bbsize;
522 __le32 d_sbsize;
523 struct bsd_partition {
524 __le32 p_size;
525 __le32 p_offset;
526 __le32 p_fsize;
527 __u8 p_fstype;
528 __u8 p_frag;
529 __le16 p_cpg;
530 } d_partitions[BSD_MAXPARTITIONS];
531};
532
533#endif
534
535#ifdef CONFIG_UNIXWARE_DISKLABEL
536
537
538
539
540
541#define UNIXWARE_DISKMAGIC (0xCA5E600DUL)
542#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL)
543#define UNIXWARE_NUMSLICE 16
544#define UNIXWARE_FS_UNUSED 0
545
546struct unixware_slice {
547 __le16 s_label;
548 __le16 s_flags;
549 __le32 start_sect;
550 __le32 nr_sects;
551};
552
553struct unixware_disklabel {
554 __le32 d_type;
555 __le32 d_magic;
556 __le32 d_version;
557 char d_serial[12];
558 __le32 d_ncylinders;
559 __le32 d_ntracks;
560 __le32 d_nsectors;
561 __le32 d_secsize;
562 __le32 d_part_start;
563 __le32 d_unknown1[12];
564 __le32 d_alt_tbl;
565 __le32 d_alt_len;
566 __le32 d_phys_cyl;
567 __le32 d_phys_trk;
568 __le32 d_phys_sec;
569 __le32 d_phys_bytes;
570 __le32 d_unknown2;
571 __le32 d_unknown3;
572 __le32 d_pad[8];
573
574 struct unixware_vtoc {
575 __le32 v_magic;
576 __le32 v_version;
577 char v_name[8];
578 __le16 v_nslices;
579 __le16 v_unknown1;
580 __le32 v_reserved[10];
581 struct unixware_slice
582 v_slice[UNIXWARE_NUMSLICE];
583 } vtoc;
584
585};
586
587#endif
588
589#ifdef CONFIG_MINIX_SUBPARTITION
590# define MINIX_NR_SUBPARTITIONS 4
591#endif
592
593#define ADDPART_FLAG_NONE 0
594#define ADDPART_FLAG_RAID 1
595#define ADDPART_FLAG_WHOLEDISK 2
596
597extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
598extern void blk_free_devt(dev_t devt);
599extern dev_t blk_lookup_devt(const char *name, int partno);
600extern char *disk_name (struct gendisk *hd, int partno, char *buf);
601
602extern int disk_expand_part_tbl(struct gendisk *disk, int target);
603extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
604extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
605extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
606 int partno, sector_t start,
607 sector_t len, int flags,
608 struct partition_meta_info
609 *info);
610extern void __delete_partition(struct percpu_ref *);
611extern void delete_partition(struct gendisk *, int);
612extern void printk_all_partitions(void);
613
614extern struct gendisk *__alloc_disk_node(int minors, int node_id);
615extern struct kobject *get_disk_and_module(struct gendisk *disk);
616extern void put_disk(struct gendisk *disk);
617extern void put_disk_and_module(struct gendisk *disk);
618extern void blk_register_region(dev_t devt, unsigned long range,
619 struct module *module,
620 struct kobject *(*probe)(dev_t, int *, void *),
621 int (*lock)(dev_t, void *),
622 void *data);
623extern void blk_unregister_region(dev_t devt, unsigned long range);
624
625extern ssize_t part_size_show(struct device *dev,
626 struct device_attribute *attr, char *buf);
627extern ssize_t part_stat_show(struct device *dev,
628 struct device_attribute *attr, char *buf);
629extern ssize_t part_inflight_show(struct device *dev,
630 struct device_attribute *attr, char *buf);
631#ifdef CONFIG_FAIL_MAKE_REQUEST
632extern ssize_t part_fail_show(struct device *dev,
633 struct device_attribute *attr, char *buf);
634extern ssize_t part_fail_store(struct device *dev,
635 struct device_attribute *attr,
636 const char *buf, size_t count);
637#endif
638
639#define alloc_disk_node(minors, node_id) \
640({ \
641 static struct lock_class_key __key; \
642 const char *__name; \
643 struct gendisk *__disk; \
644 \
645 __name = "(gendisk_completion)"#minors"("#node_id")"; \
646 \
647 __disk = __alloc_disk_node(minors, node_id); \
648 \
649 if (__disk) \
650 lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
651 \
652 __disk; \
653})
654
655#define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
656
657static inline int hd_ref_init(struct hd_struct *part)
658{
659 if (percpu_ref_init(&part->ref, __delete_partition, 0,
660 GFP_KERNEL))
661 return -ENOMEM;
662 return 0;
663}
664
665static inline void hd_struct_get(struct hd_struct *part)
666{
667 percpu_ref_get(&part->ref);
668}
669
670static inline int hd_struct_try_get(struct hd_struct *part)
671{
672 return percpu_ref_tryget_live(&part->ref);
673}
674
675static inline void hd_struct_put(struct hd_struct *part)
676{
677 percpu_ref_put(&part->ref);
678}
679
680static inline void hd_struct_kill(struct hd_struct *part)
681{
682 percpu_ref_kill(&part->ref);
683}
684
685static inline void hd_free_part(struct hd_struct *part)
686{
687 free_part_stats(part);
688 free_part_info(part);
689 percpu_ref_exit(&part->ref);
690}
691
692
693
694
695
696
697
698
699
700
701static inline sector_t part_nr_sects_read(struct hd_struct *part)
702{
703#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
704 sector_t nr_sects;
705 unsigned seq;
706 do {
707 seq = read_seqcount_begin(&part->nr_sects_seq);
708 nr_sects = part->nr_sects;
709 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
710 return nr_sects;
711#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
712 sector_t nr_sects;
713
714 preempt_disable();
715 nr_sects = part->nr_sects;
716 preempt_enable();
717 return nr_sects;
718#else
719 return part->nr_sects;
720#endif
721}
722
723
724
725
726
727
728static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
729{
730#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
731 write_seqcount_begin(&part->nr_sects_seq);
732 part->nr_sects = size;
733 write_seqcount_end(&part->nr_sects_seq);
734#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
735 preempt_disable();
736 part->nr_sects = size;
737 preempt_enable();
738#else
739 part->nr_sects = size;
740#endif
741}
742
743#if defined(CONFIG_BLK_DEV_INTEGRITY)
744extern void blk_integrity_add(struct gendisk *);
745extern void blk_integrity_del(struct gendisk *);
746#else
747static inline void blk_integrity_add(struct gendisk *disk) { }
748static inline void blk_integrity_del(struct gendisk *disk) { }
749#endif
750
751#else
752
753static inline void printk_all_partitions(void) { }
754
755static inline dev_t blk_lookup_devt(const char *name, int partno)
756{
757 dev_t devt = MKDEV(0, 0);
758 return devt;
759}
760#endif
761
762#endif
763