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
16#ifdef CONFIG_BLOCK
17
18#define kobj_to_dev(k) container_of((k), struct device, kobj)
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
90struct hd_struct {
91 sector_t start_sect;
92 sector_t nr_sects;
93 sector_t alignment_offset;
94 struct device __dev;
95 struct kobject *holder_dir;
96 int policy, partno;
97#ifdef CONFIG_FAIL_MAKE_REQUEST
98 int make_it_fail;
99#endif
100 unsigned long stamp;
101 int in_flight[2];
102#ifdef CONFIG_SMP
103 struct disk_stats *dkstats;
104#else
105 struct disk_stats dkstats;
106#endif
107 struct rcu_head rcu_head;
108};
109
110#define GENHD_FL_REMOVABLE 1
111#define GENHD_FL_DRIVERFS 2
112#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
113#define GENHD_FL_CD 8
114#define GENHD_FL_UP 16
115#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
116#define GENHD_FL_EXT_DEVT 64
117#define GENHD_FL_NATIVE_CAPACITY 128
118
119#define BLK_SCSI_MAX_CMDS (256)
120#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
121
122struct blk_scsi_cmd_filter {
123 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
124 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
125 struct kobject kobj;
126};
127
128struct disk_part_tbl {
129 struct rcu_head rcu_head;
130 int len;
131 struct hd_struct *last_lookup;
132 struct hd_struct *part[];
133};
134
135struct gendisk {
136
137
138
139 int major;
140 int first_minor;
141 int minors;
142
143
144 char disk_name[DISK_NAME_LEN];
145 char *(*devnode)(struct gendisk *gd, mode_t *mode);
146
147
148
149
150
151 struct disk_part_tbl *part_tbl;
152 struct hd_struct part0;
153
154 const struct block_device_operations *fops;
155 struct request_queue *queue;
156 void *private_data;
157
158 int flags;
159 struct device *driverfs_dev;
160 struct kobject *slave_dir;
161
162 struct timer_rand_state *random;
163
164 atomic_t sync_io;
165 struct work_struct async_notify;
166#ifdef CONFIG_BLK_DEV_INTEGRITY
167 struct blk_integrity *integrity;
168#endif
169 int node_id;
170};
171
172static inline struct gendisk *part_to_disk(struct hd_struct *part)
173{
174 if (likely(part)) {
175 if (part->partno)
176 return dev_to_disk(part_to_dev(part)->parent);
177 else
178 return dev_to_disk(part_to_dev(part));
179 }
180 return NULL;
181}
182
183static inline int disk_max_parts(struct gendisk *disk)
184{
185 if (disk->flags & GENHD_FL_EXT_DEVT)
186 return DISK_MAX_PARTS;
187 return disk->minors;
188}
189
190static inline bool disk_partitionable(struct gendisk *disk)
191{
192 return disk_max_parts(disk) > 1;
193}
194
195static inline dev_t disk_devt(struct gendisk *disk)
196{
197 return disk_to_dev(disk)->devt;
198}
199
200static inline dev_t part_devt(struct hd_struct *part)
201{
202 return part_to_dev(part)->devt;
203}
204
205extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
206
207static inline void disk_put_part(struct hd_struct *part)
208{
209 if (likely(part))
210 put_device(part_to_dev(part));
211}
212
213
214
215
216#define DISK_PITER_REVERSE (1 << 0)
217#define DISK_PITER_INCL_EMPTY (1 << 1)
218#define DISK_PITER_INCL_PART0 (1 << 2)
219#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3)
220
221struct disk_part_iter {
222 struct gendisk *disk;
223 struct hd_struct *part;
224 int idx;
225 unsigned int flags;
226};
227
228extern void disk_part_iter_init(struct disk_part_iter *piter,
229 struct gendisk *disk, unsigned int flags);
230extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
231extern void disk_part_iter_exit(struct disk_part_iter *piter);
232
233extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
234 sector_t sector);
235
236
237
238
239
240
241
242
243
244
245
246
247
248#ifdef CONFIG_SMP
249#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
250#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
251
252#define __part_stat_add(cpu, part, field, addnd) \
253 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
254
255#define part_stat_read(part, field) \
256({ \
257 typeof((part)->dkstats->field) res = 0; \
258 int i; \
259 for_each_possible_cpu(i) \
260 res += per_cpu_ptr((part)->dkstats, i)->field; \
261 res; \
262})
263
264static inline void part_stat_set_all(struct hd_struct *part, int value)
265{
266 int i;
267
268 for_each_possible_cpu(i)
269 memset(per_cpu_ptr(part->dkstats, i), value,
270 sizeof(struct disk_stats));
271}
272
273static inline int init_part_stats(struct hd_struct *part)
274{
275 part->dkstats = alloc_percpu(struct disk_stats);
276 if (!part->dkstats)
277 return 0;
278 return 1;
279}
280
281static inline void free_part_stats(struct hd_struct *part)
282{
283 free_percpu(part->dkstats);
284}
285
286#else
287#define part_stat_lock() ({ rcu_read_lock(); 0; })
288#define part_stat_unlock() rcu_read_unlock()
289
290#define __part_stat_add(cpu, part, field, addnd) \
291 ((part)->dkstats.field += addnd)
292
293#define part_stat_read(part, field) ((part)->dkstats.field)
294
295static inline void part_stat_set_all(struct hd_struct *part, int value)
296{
297 memset(&part->dkstats, value, sizeof(struct disk_stats));
298}
299
300static inline int init_part_stats(struct hd_struct *part)
301{
302 return 1;
303}
304
305static inline void free_part_stats(struct hd_struct *part)
306{
307}
308
309#endif
310
311#define part_stat_add(cpu, part, field, addnd) do { \
312 __part_stat_add((cpu), (part), field, addnd); \
313 if ((part)->partno) \
314 __part_stat_add((cpu), &part_to_disk((part))->part0, \
315 field, addnd); \
316} while (0)
317
318#define part_stat_dec(cpu, gendiskp, field) \
319 part_stat_add(cpu, gendiskp, field, -1)
320#define part_stat_inc(cpu, gendiskp, field) \
321 part_stat_add(cpu, gendiskp, field, 1)
322#define part_stat_sub(cpu, gendiskp, field, subnd) \
323 part_stat_add(cpu, gendiskp, field, -subnd)
324
325static inline void part_inc_in_flight(struct hd_struct *part, int rw)
326{
327 part->in_flight[rw]++;
328 if (part->partno)
329 part_to_disk(part)->part0.in_flight[rw]++;
330}
331
332static inline void part_dec_in_flight(struct hd_struct *part, int rw)
333{
334 part->in_flight[rw]--;
335 if (part->partno)
336 part_to_disk(part)->part0.in_flight[rw]--;
337}
338
339static inline int part_in_flight(struct hd_struct *part)
340{
341 return part->in_flight[0] + part->in_flight[1];
342}
343
344
345extern void part_round_stats(int cpu, struct hd_struct *part);
346
347
348extern void add_disk(struct gendisk *disk);
349extern void del_gendisk(struct gendisk *gp);
350extern void unlink_gendisk(struct gendisk *gp);
351extern struct gendisk *get_gendisk(dev_t dev, int *partno);
352extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
353
354extern void set_device_ro(struct block_device *bdev, int flag);
355extern void set_disk_ro(struct gendisk *disk, int flag);
356
357static inline int get_disk_ro(struct gendisk *disk)
358{
359 return disk->part0.policy;
360}
361
362
363extern void add_disk_randomness(struct gendisk *disk);
364extern void rand_initialize_disk(struct gendisk *disk);
365
366static inline sector_t get_start_sect(struct block_device *bdev)
367{
368 return bdev->bd_part->start_sect;
369}
370static inline sector_t get_capacity(struct gendisk *disk)
371{
372 return disk->part0.nr_sects;
373}
374static inline void set_capacity(struct gendisk *disk, sector_t size)
375{
376 disk->part0.nr_sects = size;
377}
378
379#ifdef CONFIG_SOLARIS_X86_PARTITION
380
381#define SOLARIS_X86_NUMSLICE 16
382#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
383
384struct solaris_x86_slice {
385 __le16 s_tag;
386 __le16 s_flag;
387 __le32 s_start;
388 __le32 s_size;
389};
390
391struct solaris_x86_vtoc {
392 unsigned int v_bootinfo[3];
393 __le32 v_sanity;
394 __le32 v_version;
395 char v_volume[8];
396 __le16 v_sectorsz;
397 __le16 v_nparts;
398 unsigned int v_reserved[10];
399 struct solaris_x86_slice
400 v_slice[SOLARIS_X86_NUMSLICE];
401 unsigned int timestamp[SOLARIS_X86_NUMSLICE];
402 char v_asciilabel[128];
403};
404
405#endif
406
407#ifdef CONFIG_BSD_DISKLABEL
408
409
410
411
412
413
414
415#define BSD_DISKMAGIC (0x82564557UL)
416#define BSD_MAXPARTITIONS 16
417#define OPENBSD_MAXPARTITIONS 16
418#define BSD_FS_UNUSED 0
419struct bsd_disklabel {
420 __le32 d_magic;
421 __s16 d_type;
422 __s16 d_subtype;
423 char d_typename[16];
424 char d_packname[16];
425 __u32 d_secsize;
426 __u32 d_nsectors;
427 __u32 d_ntracks;
428 __u32 d_ncylinders;
429 __u32 d_secpercyl;
430 __u32 d_secperunit;
431 __u16 d_sparespertrack;
432 __u16 d_sparespercyl;
433 __u32 d_acylinders;
434 __u16 d_rpm;
435 __u16 d_interleave;
436 __u16 d_trackskew;
437 __u16 d_cylskew;
438 __u32 d_headswitch;
439 __u32 d_trkseek;
440 __u32 d_flags;
441#define NDDATA 5
442 __u32 d_drivedata[NDDATA];
443#define NSPARE 5
444 __u32 d_spare[NSPARE];
445 __le32 d_magic2;
446 __le16 d_checksum;
447
448
449 __le16 d_npartitions;
450 __le32 d_bbsize;
451 __le32 d_sbsize;
452 struct bsd_partition {
453 __le32 p_size;
454 __le32 p_offset;
455 __le32 p_fsize;
456 __u8 p_fstype;
457 __u8 p_frag;
458 __le16 p_cpg;
459 } d_partitions[BSD_MAXPARTITIONS];
460};
461
462#endif
463
464#ifdef CONFIG_UNIXWARE_DISKLABEL
465
466
467
468
469
470#define UNIXWARE_DISKMAGIC (0xCA5E600DUL)
471#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL)
472#define UNIXWARE_NUMSLICE 16
473#define UNIXWARE_FS_UNUSED 0
474
475struct unixware_slice {
476 __le16 s_label;
477 __le16 s_flags;
478 __le32 start_sect;
479 __le32 nr_sects;
480};
481
482struct unixware_disklabel {
483 __le32 d_type;
484 __le32 d_magic;
485 __le32 d_version;
486 char d_serial[12];
487 __le32 d_ncylinders;
488 __le32 d_ntracks;
489 __le32 d_nsectors;
490 __le32 d_secsize;
491 __le32 d_part_start;
492 __le32 d_unknown1[12];
493 __le32 d_alt_tbl;
494 __le32 d_alt_len;
495 __le32 d_phys_cyl;
496 __le32 d_phys_trk;
497 __le32 d_phys_sec;
498 __le32 d_phys_bytes;
499 __le32 d_unknown2;
500 __le32 d_unknown3;
501 __le32 d_pad[8];
502
503 struct unixware_vtoc {
504 __le32 v_magic;
505 __le32 v_version;
506 char v_name[8];
507 __le16 v_nslices;
508 __le16 v_unknown1;
509 __le32 v_reserved[10];
510 struct unixware_slice
511 v_slice[UNIXWARE_NUMSLICE];
512 } vtoc;
513
514};
515
516#endif
517
518#ifdef CONFIG_MINIX_SUBPARTITION
519# define MINIX_NR_SUBPARTITIONS 4
520#endif
521
522#define ADDPART_FLAG_NONE 0
523#define ADDPART_FLAG_RAID 1
524#define ADDPART_FLAG_WHOLEDISK 2
525
526extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
527extern void blk_free_devt(dev_t devt);
528extern dev_t blk_lookup_devt(const char *name, int partno);
529extern char *disk_name (struct gendisk *hd, int partno, char *buf);
530
531extern int disk_expand_part_tbl(struct gendisk *disk, int target);
532extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
533extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
534 int partno, sector_t start,
535 sector_t len, int flags);
536extern void delete_partition(struct gendisk *, int);
537extern void printk_all_partitions(void);
538
539extern struct gendisk *alloc_disk_node(int minors, int node_id);
540extern struct gendisk *alloc_disk(int minors);
541extern struct kobject *get_disk(struct gendisk *disk);
542extern void put_disk(struct gendisk *disk);
543extern void blk_register_region(dev_t devt, unsigned long range,
544 struct module *module,
545 struct kobject *(*probe)(dev_t, int *, void *),
546 int (*lock)(dev_t, void *),
547 void *data);
548extern void blk_unregister_region(dev_t devt, unsigned long range);
549
550extern ssize_t part_size_show(struct device *dev,
551 struct device_attribute *attr, char *buf);
552extern ssize_t part_stat_show(struct device *dev,
553 struct device_attribute *attr, char *buf);
554extern ssize_t part_inflight_show(struct device *dev,
555 struct device_attribute *attr, char *buf);
556#ifdef CONFIG_FAIL_MAKE_REQUEST
557extern ssize_t part_fail_show(struct device *dev,
558 struct device_attribute *attr, char *buf);
559extern ssize_t part_fail_store(struct device *dev,
560 struct device_attribute *attr,
561 const char *buf, size_t count);
562#endif
563
564#else
565
566static inline void printk_all_partitions(void) { }
567
568static inline dev_t blk_lookup_devt(const char *name, int partno)
569{
570 dev_t devt = MKDEV(0, 0);
571 return devt;
572}
573
574#endif
575
576#endif
577