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
17#ifdef CONFIG_BLOCK
18
19#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
20#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
21#define disk_to_dev(disk) (&(disk)->part0.__dev)
22#define part_to_dev(part) (&((part)->__dev))
23
24extern struct device_type part_type;
25extern struct kobject *block_depr;
26extern struct class block_class;
27
28enum {
29
30
31 DOS_EXTENDED_PARTITION = 5,
32 LINUX_EXTENDED_PARTITION = 0x85,
33 WIN98_EXTENDED_PARTITION = 0x0f,
34
35 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
36
37 LINUX_SWAP_PARTITION = 0x82,
38 LINUX_DATA_PARTITION = 0x83,
39 LINUX_LVM_PARTITION = 0x8e,
40 LINUX_RAID_PARTITION = 0xfd,
41
42 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
43 NEW_SOLARIS_X86_PARTITION = 0xbf,
44
45 DM6_AUX1PARTITION = 0x51,
46 DM6_AUX3PARTITION = 0x53,
47 DM6_PARTITION = 0x54,
48 EZD_PARTITION = 0x55,
49
50 FREEBSD_PARTITION = 0xa5,
51 OPENBSD_PARTITION = 0xa6,
52 NETBSD_PARTITION = 0xa9,
53 BSDI_PARTITION = 0xb7,
54 MINIX_PARTITION = 0x81,
55 UNIXWARE_PARTITION = 0x63,
56};
57
58#define DISK_MAX_PARTS 256
59#define DISK_NAME_LEN 32
60
61#include <linux/major.h>
62#include <linux/device.h>
63#include <linux/smp.h>
64#include <linux/string.h>
65#include <linux/fs.h>
66#include <linux/workqueue.h>
67
68struct partition {
69 unsigned char boot_ind;
70 unsigned char head;
71 unsigned char sector;
72 unsigned char cyl;
73 unsigned char sys_ind;
74 unsigned char end_head;
75 unsigned char end_sector;
76 unsigned char end_cyl;
77 __le32 start_sect;
78 __le32 nr_sects;
79} __attribute__((packed));
80
81struct disk_stats {
82 unsigned long sectors[2];
83 unsigned long ios[2];
84 unsigned long merges[2];
85 unsigned long ticks[2];
86 unsigned long io_ticks;
87 unsigned long time_in_queue;
88};
89
90#define PARTITION_META_INFO_VOLNAMELTH 64
91
92
93
94
95#define PARTITION_META_INFO_UUIDLTH 37
96
97struct partition_meta_info {
98 char uuid[PARTITION_META_INFO_UUIDLTH];
99 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
100};
101
102struct hd_struct {
103 sector_t start_sect;
104
105
106
107
108
109 sector_t nr_sects;
110 seqcount_t nr_sects_seq;
111 sector_t alignment_offset;
112 unsigned int discard_alignment;
113 struct device __dev;
114 struct kobject *holder_dir;
115 int policy, partno;
116 struct partition_meta_info *info;
117#ifdef CONFIG_FAIL_MAKE_REQUEST
118 int make_it_fail;
119#endif
120 unsigned long stamp;
121 atomic_t in_flight[2];
122#ifdef CONFIG_SMP
123 struct disk_stats __percpu *dkstats;
124#else
125 struct disk_stats dkstats;
126#endif
127 atomic_t ref;
128 struct rcu_head rcu_head;
129};
130
131#define GENHD_FL_REMOVABLE 1
132
133#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
134#define GENHD_FL_CD 8
135#define GENHD_FL_UP 16
136#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
137#define GENHD_FL_EXT_DEVT 64
138#define GENHD_FL_NATIVE_CAPACITY 128
139#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
140#define GENHD_FL_NO_PART_SCAN 512
141
142enum {
143 DISK_EVENT_MEDIA_CHANGE = 1 << 0,
144 DISK_EVENT_EJECT_REQUEST = 1 << 1,
145};
146
147#define BLK_SCSI_MAX_CMDS (256)
148#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
149
150struct blk_scsi_cmd_filter {
151 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
152 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
153 struct kobject kobj;
154};
155
156struct disk_part_tbl {
157 struct rcu_head rcu_head;
158 int len;
159 struct hd_struct __rcu *last_lookup;
160 struct hd_struct __rcu *part[];
161};
162
163struct disk_events;
164
165struct gendisk {
166
167
168
169 int major;
170 int first_minor;
171 int minors;
172
173
174 char disk_name[DISK_NAME_LEN];
175 char *(*devnode)(struct gendisk *gd, umode_t *mode);
176
177 unsigned int events;
178 unsigned int async_events;
179
180
181
182
183
184
185 struct disk_part_tbl __rcu *part_tbl;
186 struct hd_struct part0;
187
188 const struct block_device_operations *fops;
189 struct request_queue *queue;
190 void *private_data;
191
192 int flags;
193 struct device *driverfs_dev;
194 struct kobject *slave_dir;
195
196 struct timer_rand_state *random;
197 atomic_t sync_io;
198 struct disk_events *ev;
199#ifdef CONFIG_BLK_DEV_INTEGRITY
200 struct blk_integrity *integrity;
201#endif
202 int node_id;
203};
204
205static inline struct gendisk *part_to_disk(struct hd_struct *part)
206{
207 if (likely(part)) {
208 if (part->partno)
209 return dev_to_disk(part_to_dev(part)->parent);
210 else
211 return dev_to_disk(part_to_dev(part));
212 }
213 return NULL;
214}
215
216static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
217{
218 int i;
219 for (i = 0; i < 16; ++i) {
220 *to++ = (hex_to_bin(*uuid_str) << 4) |
221 (hex_to_bin(*(uuid_str + 1)));
222 uuid_str += 2;
223 switch (i) {
224 case 3:
225 case 5:
226 case 7:
227 case 9:
228 uuid_str++;
229 continue;
230 }
231 }
232}
233
234static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
235{
236 part_pack_uuid(uuid_str, to);
237 return 0;
238}
239
240static inline int disk_max_parts(struct gendisk *disk)
241{
242 if (disk->flags & GENHD_FL_EXT_DEVT)
243 return DISK_MAX_PARTS;
244 return disk->minors;
245}
246
247static inline bool disk_part_scan_enabled(struct gendisk *disk)
248{
249 return disk_max_parts(disk) > 1 &&
250 !(disk->flags & GENHD_FL_NO_PART_SCAN);
251}
252
253static inline dev_t disk_devt(struct gendisk *disk)
254{
255 return disk_to_dev(disk)->devt;
256}
257
258static inline dev_t part_devt(struct hd_struct *part)
259{
260 return part_to_dev(part)->devt;
261}
262
263extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
264
265static inline void disk_put_part(struct hd_struct *part)
266{
267 if (likely(part))
268 put_device(part_to_dev(part));
269}
270
271
272
273
274#define DISK_PITER_REVERSE (1 << 0)
275#define DISK_PITER_INCL_EMPTY (1 << 1)
276#define DISK_PITER_INCL_PART0 (1 << 2)
277#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3)
278
279struct disk_part_iter {
280 struct gendisk *disk;
281 struct hd_struct *part;
282 int idx;
283 unsigned int flags;
284};
285
286extern void disk_part_iter_init(struct disk_part_iter *piter,
287 struct gendisk *disk, unsigned int flags);
288extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
289extern void disk_part_iter_exit(struct disk_part_iter *piter);
290
291extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
292 sector_t sector);
293
294
295
296
297
298
299
300
301
302
303
304
305
306#ifdef CONFIG_SMP
307#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
308#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
309
310#define __part_stat_add(cpu, part, field, addnd) \
311 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
312
313#define part_stat_read(part, field) \
314({ \
315 typeof((part)->dkstats->field) res = 0; \
316 unsigned int _cpu; \
317 for_each_possible_cpu(_cpu) \
318 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
319 res; \
320})
321
322static inline void part_stat_set_all(struct hd_struct *part, int value)
323{
324 int i;
325
326 for_each_possible_cpu(i)
327 memset(per_cpu_ptr(part->dkstats, i), value,
328 sizeof(struct disk_stats));
329}
330
331static inline int init_part_stats(struct hd_struct *part)
332{
333 part->dkstats = alloc_percpu(struct disk_stats);
334 if (!part->dkstats)
335 return 0;
336 return 1;
337}
338
339static inline void free_part_stats(struct hd_struct *part)
340{
341 free_percpu(part->dkstats);
342}
343
344#else
345#define part_stat_lock() ({ rcu_read_lock(); 0; })
346#define part_stat_unlock() rcu_read_unlock()
347
348#define __part_stat_add(cpu, part, field, addnd) \
349 ((part)->dkstats.field += addnd)
350
351#define part_stat_read(part, field) ((part)->dkstats.field)
352
353static inline void part_stat_set_all(struct hd_struct *part, int value)
354{
355 memset(&part->dkstats, value, sizeof(struct disk_stats));
356}
357
358static inline int init_part_stats(struct hd_struct *part)
359{
360 return 1;
361}
362
363static inline void free_part_stats(struct hd_struct *part)
364{
365}
366
367#endif
368
369#define part_stat_add(cpu, part, field, addnd) do { \
370 __part_stat_add((cpu), (part), field, addnd); \
371 if ((part)->partno) \
372 __part_stat_add((cpu), &part_to_disk((part))->part0, \
373 field, addnd); \
374} while (0)
375
376#define part_stat_dec(cpu, gendiskp, field) \
377 part_stat_add(cpu, gendiskp, field, -1)
378#define part_stat_inc(cpu, gendiskp, field) \
379 part_stat_add(cpu, gendiskp, field, 1)
380#define part_stat_sub(cpu, gendiskp, field, subnd) \
381 part_stat_add(cpu, gendiskp, field, -subnd)
382
383static inline void part_inc_in_flight(struct hd_struct *part, int rw)
384{
385 atomic_inc(&part->in_flight[rw]);
386 if (part->partno)
387 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
388}
389
390static inline void part_dec_in_flight(struct hd_struct *part, int rw)
391{
392 atomic_dec(&part->in_flight[rw]);
393 if (part->partno)
394 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
395}
396
397static inline int part_in_flight(struct hd_struct *part)
398{
399 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
400}
401
402static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
403{
404 if (disk)
405 return kzalloc_node(sizeof(struct partition_meta_info),
406 GFP_KERNEL, disk->node_id);
407 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
408}
409
410static inline void free_part_info(struct hd_struct *part)
411{
412 kfree(part->info);
413}
414
415
416extern void part_round_stats(int cpu, struct hd_struct *part);
417
418
419extern void add_disk(struct gendisk *disk);
420extern void del_gendisk(struct gendisk *gp);
421extern struct gendisk *get_gendisk(dev_t dev, int *partno);
422extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
423
424extern void set_device_ro(struct block_device *bdev, int flag);
425extern void set_disk_ro(struct gendisk *disk, int flag);
426
427static inline int get_disk_ro(struct gendisk *disk)
428{
429 return disk->part0.policy;
430}
431
432extern void disk_block_events(struct gendisk *disk);
433extern void disk_unblock_events(struct gendisk *disk);
434extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
435extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
436
437
438extern void add_disk_randomness(struct gendisk *disk);
439extern void rand_initialize_disk(struct gendisk *disk);
440
441static inline sector_t get_start_sect(struct block_device *bdev)
442{
443 return bdev->bd_part->start_sect;
444}
445static inline sector_t get_capacity(struct gendisk *disk)
446{
447 return disk->part0.nr_sects;
448}
449static inline void set_capacity(struct gendisk *disk, sector_t size)
450{
451 disk->part0.nr_sects = size;
452}
453
454#ifdef CONFIG_SOLARIS_X86_PARTITION
455
456#define SOLARIS_X86_NUMSLICE 16
457#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
458
459struct solaris_x86_slice {
460 __le16 s_tag;
461 __le16 s_flag;
462 __le32 s_start;
463 __le32 s_size;
464};
465
466struct solaris_x86_vtoc {
467 unsigned int v_bootinfo[3];
468 __le32 v_sanity;
469 __le32 v_version;
470 char v_volume[8];
471 __le16 v_sectorsz;
472 __le16 v_nparts;
473 unsigned int v_reserved[10];
474 struct solaris_x86_slice
475 v_slice[SOLARIS_X86_NUMSLICE];
476 unsigned int timestamp[SOLARIS_X86_NUMSLICE];
477 char v_asciilabel[128];
478};
479
480#endif
481
482#ifdef CONFIG_BSD_DISKLABEL
483
484
485
486
487
488
489
490#define BSD_DISKMAGIC (0x82564557UL)
491#define BSD_MAXPARTITIONS 16
492#define OPENBSD_MAXPARTITIONS 16
493#define BSD_FS_UNUSED 0
494struct bsd_disklabel {
495 __le32 d_magic;
496 __s16 d_type;
497 __s16 d_subtype;
498 char d_typename[16];
499 char d_packname[16];
500 __u32 d_secsize;
501 __u32 d_nsectors;
502 __u32 d_ntracks;
503 __u32 d_ncylinders;
504 __u32 d_secpercyl;
505 __u32 d_secperunit;
506 __u16 d_sparespertrack;
507 __u16 d_sparespercyl;
508 __u32 d_acylinders;
509 __u16 d_rpm;
510 __u16 d_interleave;
511 __u16 d_trackskew;
512 __u16 d_cylskew;
513 __u32 d_headswitch;
514 __u32 d_trkseek;
515 __u32 d_flags;
516#define NDDATA 5
517 __u32 d_drivedata[NDDATA];
518#define NSPARE 5
519 __u32 d_spare[NSPARE];
520 __le32 d_magic2;
521 __le16 d_checksum;
522
523
524 __le16 d_npartitions;
525 __le32 d_bbsize;
526 __le32 d_sbsize;
527 struct bsd_partition {
528 __le32 p_size;
529 __le32 p_offset;
530 __le32 p_fsize;
531 __u8 p_fstype;
532 __u8 p_frag;
533 __le16 p_cpg;
534 } d_partitions[BSD_MAXPARTITIONS];
535};
536
537#endif
538
539#ifdef CONFIG_UNIXWARE_DISKLABEL
540
541
542
543
544
545#define UNIXWARE_DISKMAGIC (0xCA5E600DUL)
546#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL)
547#define UNIXWARE_NUMSLICE 16
548#define UNIXWARE_FS_UNUSED 0
549
550struct unixware_slice {
551 __le16 s_label;
552 __le16 s_flags;
553 __le32 start_sect;
554 __le32 nr_sects;
555};
556
557struct unixware_disklabel {
558 __le32 d_type;
559 __le32 d_magic;
560 __le32 d_version;
561 char d_serial[12];
562 __le32 d_ncylinders;
563 __le32 d_ntracks;
564 __le32 d_nsectors;
565 __le32 d_secsize;
566 __le32 d_part_start;
567 __le32 d_unknown1[12];
568 __le32 d_alt_tbl;
569 __le32 d_alt_len;
570 __le32 d_phys_cyl;
571 __le32 d_phys_trk;
572 __le32 d_phys_sec;
573 __le32 d_phys_bytes;
574 __le32 d_unknown2;
575 __le32 d_unknown3;
576 __le32 d_pad[8];
577
578 struct unixware_vtoc {
579 __le32 v_magic;
580 __le32 v_version;
581 char v_name[8];
582 __le16 v_nslices;
583 __le16 v_unknown1;
584 __le32 v_reserved[10];
585 struct unixware_slice
586 v_slice[UNIXWARE_NUMSLICE];
587 } vtoc;
588
589};
590
591#endif
592
593#ifdef CONFIG_MINIX_SUBPARTITION
594# define MINIX_NR_SUBPARTITIONS 4
595#endif
596
597#define ADDPART_FLAG_NONE 0
598#define ADDPART_FLAG_RAID 1
599#define ADDPART_FLAG_WHOLEDISK 2
600
601extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
602extern void blk_free_devt(dev_t devt);
603extern dev_t blk_lookup_devt(const char *name, int partno);
604extern char *disk_name (struct gendisk *hd, int partno, char *buf);
605
606extern int disk_expand_part_tbl(struct gendisk *disk, int target);
607extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
608extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
609extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
610 int partno, sector_t start,
611 sector_t len, int flags,
612 struct partition_meta_info
613 *info);
614extern void __delete_partition(struct hd_struct *);
615extern void delete_partition(struct gendisk *, int);
616extern void printk_all_partitions(void);
617
618extern struct gendisk *alloc_disk_node(int minors, int node_id);
619extern struct gendisk *alloc_disk(int minors);
620extern struct kobject *get_disk(struct gendisk *disk);
621extern void put_disk(struct gendisk *disk);
622extern void blk_register_region(dev_t devt, unsigned long range,
623 struct module *module,
624 struct kobject *(*probe)(dev_t, int *, void *),
625 int (*lock)(dev_t, void *),
626 void *data);
627extern void blk_unregister_region(dev_t devt, unsigned long range);
628
629extern ssize_t part_size_show(struct device *dev,
630 struct device_attribute *attr, char *buf);
631extern ssize_t part_stat_show(struct device *dev,
632 struct device_attribute *attr, char *buf);
633extern ssize_t part_inflight_show(struct device *dev,
634 struct device_attribute *attr, char *buf);
635#ifdef CONFIG_FAIL_MAKE_REQUEST
636extern ssize_t part_fail_show(struct device *dev,
637 struct device_attribute *attr, char *buf);
638extern ssize_t part_fail_store(struct device *dev,
639 struct device_attribute *attr,
640 const char *buf, size_t count);
641#endif
642
643static inline void hd_ref_init(struct hd_struct *part)
644{
645 atomic_set(&part->ref, 1);
646 smp_mb();
647}
648
649static inline void hd_struct_get(struct hd_struct *part)
650{
651 atomic_inc(&part->ref);
652 smp_mb__after_atomic();
653}
654
655static inline int hd_struct_try_get(struct hd_struct *part)
656{
657 return atomic_inc_not_zero(&part->ref);
658}
659
660static inline void hd_struct_put(struct hd_struct *part)
661{
662 if (atomic_dec_and_test(&part->ref))
663 __delete_partition(part);
664}
665
666
667
668
669
670
671
672
673
674
675static inline sector_t part_nr_sects_read(struct hd_struct *part)
676{
677#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
678 sector_t nr_sects;
679 unsigned seq;
680 do {
681 seq = read_seqcount_begin(&part->nr_sects_seq);
682 nr_sects = part->nr_sects;
683 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
684 return nr_sects;
685#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
686 sector_t nr_sects;
687
688 preempt_disable();
689 nr_sects = part->nr_sects;
690 preempt_enable();
691 return nr_sects;
692#else
693 return part->nr_sects;
694#endif
695}
696
697
698
699
700
701
702static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
703{
704#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
705 write_seqcount_begin(&part->nr_sects_seq);
706 part->nr_sects = size;
707 write_seqcount_end(&part->nr_sects_seq);
708#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
709 preempt_disable();
710 part->nr_sects = size;
711 preempt_enable();
712#else
713 part->nr_sects = size;
714#endif
715}
716
717#else
718
719static inline void printk_all_partitions(void) { }
720
721static inline dev_t blk_lookup_devt(const char *name, int partno)
722{
723 dev_t devt = MKDEV(0, 0);
724 return devt;
725}
726
727static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
728{
729 return -EINVAL;
730}
731#endif
732
733#endif
734