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[thirdparty/kernel/stable.git] / include / linux / genhd.h
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
15 #ifdef CONFIG_BLOCK
16
17 #define kobj_to_dev(k) container_of(k, struct device, kobj)
18 #define dev_to_disk(device) container_of(device, struct gendisk, dev)
19 #define dev_to_part(device) container_of(device, struct hd_struct, dev)
20
21 extern struct device_type part_type;
22 extern struct kobject *block_depr;
23 extern struct class block_class;
24
25 extern const struct seq_operations partitions_op;
26 extern const struct seq_operations diskstats_op;
27
28 enum {
29 /* These three have identical behaviour; use the second one if DOS FDISK gets
30 confused about extended/logical partitions starting past cylinder 1023. */
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, /* autodetect RAID partition */
41
42 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
43 NEW_SOLARIS_X86_PARTITION = 0xbf,
44
45 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
46 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
47 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
48 EZD_PARTITION = 0x55, /* EZ-DRIVE */
49
50 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
51 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
52 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
53 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
54 MINIX_PARTITION = 0x81, /* Minix Partition ID */
55 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
56 };
57
58 #include <linux/major.h>
59 #include <linux/device.h>
60 #include <linux/smp.h>
61 #include <linux/string.h>
62 #include <linux/fs.h>
63 #include <linux/workqueue.h>
64
65 struct partition {
66 unsigned char boot_ind; /* 0x80 - active */
67 unsigned char head; /* starting head */
68 unsigned char sector; /* starting sector */
69 unsigned char cyl; /* starting cylinder */
70 unsigned char sys_ind; /* What partition type */
71 unsigned char end_head; /* end head */
72 unsigned char end_sector; /* end sector */
73 unsigned char end_cyl; /* end cylinder */
74 __le32 start_sect; /* starting sector counting from 0 */
75 __le32 nr_sects; /* nr of sectors in partition */
76 } __attribute__((packed));
77
78 struct disk_stats {
79 unsigned long sectors[2]; /* READs and WRITEs */
80 unsigned long ios[2];
81 unsigned long merges[2];
82 unsigned long ticks[2];
83 unsigned long io_ticks;
84 unsigned long time_in_queue;
85 };
86
87 struct hd_struct {
88 sector_t start_sect;
89 sector_t nr_sects;
90 struct device dev;
91 struct kobject *holder_dir;
92 int policy, partno;
93 #ifdef CONFIG_FAIL_MAKE_REQUEST
94 int make_it_fail;
95 #endif
96 unsigned long stamp;
97 int in_flight;
98 #ifdef CONFIG_SMP
99 struct disk_stats *dkstats;
100 #else
101 struct disk_stats dkstats;
102 #endif
103 };
104
105 #define GENHD_FL_REMOVABLE 1
106 #define GENHD_FL_DRIVERFS 2
107 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
108 #define GENHD_FL_CD 8
109 #define GENHD_FL_UP 16
110 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
111 #define GENHD_FL_FAIL 64
112
113 struct gendisk {
114 /* major, first_minor and minors are input parameters only,
115 * don't use directly. Use disk_devt() and disk_max_parts().
116 */
117 int major; /* major number of driver */
118 int first_minor;
119 int minors; /* maximum number of minors, =1 for
120 * disks that can't be partitioned. */
121
122 char disk_name[32]; /* name of major driver */
123 struct hd_struct **part; /* [indexed by minor - 1] */
124 struct block_device_operations *fops;
125 struct request_queue *queue;
126 void *private_data;
127 sector_t capacity;
128
129 int flags;
130 struct device *driverfs_dev; // FIXME: remove
131 struct device dev;
132 struct kobject *holder_dir;
133 struct kobject *slave_dir;
134
135 struct timer_rand_state *random;
136 int policy;
137
138 atomic_t sync_io; /* RAID */
139 unsigned long stamp;
140 int in_flight;
141 #ifdef CONFIG_SMP
142 struct disk_stats *dkstats;
143 #else
144 struct disk_stats dkstats;
145 #endif
146 struct work_struct async_notify;
147 #ifdef CONFIG_BLK_DEV_INTEGRITY
148 struct blk_integrity *integrity;
149 #endif
150 };
151
152 static inline struct gendisk *part_to_disk(struct hd_struct *part)
153 {
154 if (likely(part))
155 return dev_to_disk((part)->dev.parent);
156 return NULL;
157 }
158
159 static inline int disk_max_parts(struct gendisk *disk)
160 {
161 return disk->minors - 1;
162 }
163
164 static inline dev_t disk_devt(struct gendisk *disk)
165 {
166 return disk->dev.devt;
167 }
168
169 static inline dev_t part_devt(struct hd_struct *part)
170 {
171 return part->dev.devt;
172 }
173
174 /*
175 * Macros to operate on percpu disk statistics:
176 *
177 * The __ variants should only be called in critical sections. The full
178 * variants disable/enable preemption.
179 */
180 static inline struct hd_struct *disk_map_sector(struct gendisk *gendiskp,
181 sector_t sector)
182 {
183 struct hd_struct *part;
184 int i;
185 for (i = 0; i < disk_max_parts(gendiskp); i++) {
186 part = gendiskp->part[i];
187 if (part && part->start_sect <= sector
188 && sector < part->start_sect + part->nr_sects)
189 return part;
190 }
191 return NULL;
192 }
193
194 #ifdef CONFIG_SMP
195 #define __disk_stat_add(gendiskp, field, addnd) \
196 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
197
198 #define disk_stat_read(gendiskp, field) \
199 ({ \
200 typeof(gendiskp->dkstats->field) res = 0; \
201 int i; \
202 for_each_possible_cpu(i) \
203 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
204 res; \
205 })
206
207 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
208 int i;
209
210 for_each_possible_cpu(i)
211 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
212 sizeof(struct disk_stats));
213 }
214
215 #define __part_stat_add(part, field, addnd) \
216 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
217
218 #define __all_stat_add(gendiskp, part, field, addnd, sector) \
219 ({ \
220 if (part) \
221 __part_stat_add(part, field, addnd); \
222 __disk_stat_add(gendiskp, field, addnd); \
223 })
224
225 #define part_stat_read(part, field) \
226 ({ \
227 typeof(part->dkstats->field) res = 0; \
228 int i; \
229 for_each_possible_cpu(i) \
230 res += per_cpu_ptr(part->dkstats, i)->field; \
231 res; \
232 })
233
234 static inline void part_stat_set_all(struct hd_struct *part, int value)
235 {
236 int i;
237
238 for_each_possible_cpu(i)
239 memset(per_cpu_ptr(part->dkstats, i), value,
240 sizeof(struct disk_stats));
241 }
242
243 #else /* !CONFIG_SMP */
244 #define __disk_stat_add(gendiskp, field, addnd) \
245 (gendiskp->dkstats.field += addnd)
246 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
247
248 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
249 {
250 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
251 }
252
253 #define __part_stat_add(part, field, addnd) \
254 (part->dkstats.field += addnd)
255
256 #define __all_stat_add(gendiskp, part, field, addnd, sector) \
257 ({ \
258 if (part) \
259 part->dkstats.field += addnd; \
260 __disk_stat_add(gendiskp, field, addnd); \
261 })
262
263 #define part_stat_read(part, field) (part->dkstats.field)
264
265 static inline void part_stat_set_all(struct hd_struct *part, int value)
266 {
267 memset(&part->dkstats, value, sizeof(struct disk_stats));
268 }
269
270 #endif /* CONFIG_SMP */
271
272 #define disk_stat_add(gendiskp, field, addnd) \
273 do { \
274 preempt_disable(); \
275 __disk_stat_add(gendiskp, field, addnd); \
276 preempt_enable(); \
277 } while (0)
278
279 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
280 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
281
282 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
283 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
284
285 #define __disk_stat_sub(gendiskp, field, subnd) \
286 __disk_stat_add(gendiskp, field, -subnd)
287 #define disk_stat_sub(gendiskp, field, subnd) \
288 disk_stat_add(gendiskp, field, -subnd)
289
290 #define part_stat_add(gendiskp, field, addnd) \
291 do { \
292 preempt_disable(); \
293 __part_stat_add(gendiskp, field, addnd);\
294 preempt_enable(); \
295 } while (0)
296
297 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
298 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
299
300 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
301 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
302
303 #define __part_stat_sub(gendiskp, field, subnd) \
304 __part_stat_add(gendiskp, field, -subnd)
305 #define part_stat_sub(gendiskp, field, subnd) \
306 part_stat_add(gendiskp, field, -subnd)
307
308 #define all_stat_add(gendiskp, part, field, addnd, sector) \
309 do { \
310 preempt_disable(); \
311 __all_stat_add(gendiskp, part, field, addnd, sector); \
312 preempt_enable(); \
313 } while (0)
314
315 #define __all_stat_dec(gendiskp, field, sector) \
316 __all_stat_add(gendiskp, field, -1, sector)
317 #define all_stat_dec(gendiskp, field, sector) \
318 all_stat_add(gendiskp, field, -1, sector)
319
320 #define __all_stat_inc(gendiskp, part, field, sector) \
321 __all_stat_add(gendiskp, part, field, 1, sector)
322 #define all_stat_inc(gendiskp, part, field, sector) \
323 all_stat_add(gendiskp, part, field, 1, sector)
324
325 #define __all_stat_sub(gendiskp, part, field, subnd, sector) \
326 __all_stat_add(gendiskp, part, field, -subnd, sector)
327 #define all_stat_sub(gendiskp, part, field, subnd, sector) \
328 all_stat_add(gendiskp, part, field, -subnd, sector)
329
330 /* Inlines to alloc and free disk stats in struct gendisk */
331 #ifdef CONFIG_SMP
332 static inline int init_disk_stats(struct gendisk *disk)
333 {
334 disk->dkstats = alloc_percpu(struct disk_stats);
335 if (!disk->dkstats)
336 return 0;
337 return 1;
338 }
339
340 static inline void free_disk_stats(struct gendisk *disk)
341 {
342 free_percpu(disk->dkstats);
343 }
344
345 static inline int init_part_stats(struct hd_struct *part)
346 {
347 part->dkstats = alloc_percpu(struct disk_stats);
348 if (!part->dkstats)
349 return 0;
350 return 1;
351 }
352
353 static inline void free_part_stats(struct hd_struct *part)
354 {
355 free_percpu(part->dkstats);
356 }
357
358 #else /* CONFIG_SMP */
359 static inline int init_disk_stats(struct gendisk *disk)
360 {
361 return 1;
362 }
363
364 static inline void free_disk_stats(struct gendisk *disk)
365 {
366 }
367
368 static inline int init_part_stats(struct hd_struct *part)
369 {
370 return 1;
371 }
372
373 static inline void free_part_stats(struct hd_struct *part)
374 {
375 }
376 #endif /* CONFIG_SMP */
377
378 /* drivers/block/ll_rw_blk.c */
379 extern void disk_round_stats(struct gendisk *disk);
380 extern void part_round_stats(struct hd_struct *part);
381
382 /* drivers/block/genhd.c */
383 extern int get_blkdev_list(char *, int);
384 extern void add_disk(struct gendisk *disk);
385 extern void del_gendisk(struct gendisk *gp);
386 extern void unlink_gendisk(struct gendisk *gp);
387 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
388 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
389
390 extern void set_device_ro(struct block_device *bdev, int flag);
391 extern void set_disk_ro(struct gendisk *disk, int flag);
392
393 /* drivers/char/random.c */
394 extern void add_disk_randomness(struct gendisk *disk);
395 extern void rand_initialize_disk(struct gendisk *disk);
396
397 static inline sector_t get_start_sect(struct block_device *bdev)
398 {
399 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
400 }
401 static inline sector_t get_capacity(struct gendisk *disk)
402 {
403 return disk->capacity;
404 }
405 static inline void set_capacity(struct gendisk *disk, sector_t size)
406 {
407 disk->capacity = size;
408 }
409
410 #ifdef CONFIG_SOLARIS_X86_PARTITION
411
412 #define SOLARIS_X86_NUMSLICE 16
413 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
414
415 struct solaris_x86_slice {
416 __le16 s_tag; /* ID tag of partition */
417 __le16 s_flag; /* permission flags */
418 __le32 s_start; /* start sector no of partition */
419 __le32 s_size; /* # of blocks in partition */
420 };
421
422 struct solaris_x86_vtoc {
423 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
424 __le32 v_sanity; /* to verify vtoc sanity */
425 __le32 v_version; /* layout version */
426 char v_volume[8]; /* volume name */
427 __le16 v_sectorsz; /* sector size in bytes */
428 __le16 v_nparts; /* number of partitions */
429 unsigned int v_reserved[10]; /* free space */
430 struct solaris_x86_slice
431 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
432 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
433 char v_asciilabel[128]; /* for compatibility */
434 };
435
436 #endif /* CONFIG_SOLARIS_X86_PARTITION */
437
438 #ifdef CONFIG_BSD_DISKLABEL
439 /*
440 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
441 * updated by Marc Espie <Marc.Espie@openbsd.org>
442 */
443
444 /* check against BSD src/sys/sys/disklabel.h for consistency */
445
446 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
447 #define BSD_MAXPARTITIONS 16
448 #define OPENBSD_MAXPARTITIONS 16
449 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
450 struct bsd_disklabel {
451 __le32 d_magic; /* the magic number */
452 __s16 d_type; /* drive type */
453 __s16 d_subtype; /* controller/d_type specific */
454 char d_typename[16]; /* type name, e.g. "eagle" */
455 char d_packname[16]; /* pack identifier */
456 __u32 d_secsize; /* # of bytes per sector */
457 __u32 d_nsectors; /* # of data sectors per track */
458 __u32 d_ntracks; /* # of tracks per cylinder */
459 __u32 d_ncylinders; /* # of data cylinders per unit */
460 __u32 d_secpercyl; /* # of data sectors per cylinder */
461 __u32 d_secperunit; /* # of data sectors per unit */
462 __u16 d_sparespertrack; /* # of spare sectors per track */
463 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
464 __u32 d_acylinders; /* # of alt. cylinders per unit */
465 __u16 d_rpm; /* rotational speed */
466 __u16 d_interleave; /* hardware sector interleave */
467 __u16 d_trackskew; /* sector 0 skew, per track */
468 __u16 d_cylskew; /* sector 0 skew, per cylinder */
469 __u32 d_headswitch; /* head switch time, usec */
470 __u32 d_trkseek; /* track-to-track seek, usec */
471 __u32 d_flags; /* generic flags */
472 #define NDDATA 5
473 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
474 #define NSPARE 5
475 __u32 d_spare[NSPARE]; /* reserved for future use */
476 __le32 d_magic2; /* the magic number (again) */
477 __le16 d_checksum; /* xor of data incl. partitions */
478
479 /* filesystem and partition information: */
480 __le16 d_npartitions; /* number of partitions in following */
481 __le32 d_bbsize; /* size of boot area at sn0, bytes */
482 __le32 d_sbsize; /* max size of fs superblock, bytes */
483 struct bsd_partition { /* the partition table */
484 __le32 p_size; /* number of sectors in partition */
485 __le32 p_offset; /* starting sector */
486 __le32 p_fsize; /* filesystem basic fragment size */
487 __u8 p_fstype; /* filesystem type, see below */
488 __u8 p_frag; /* filesystem fragments per block */
489 __le16 p_cpg; /* filesystem cylinders per group */
490 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
491 };
492
493 #endif /* CONFIG_BSD_DISKLABEL */
494
495 #ifdef CONFIG_UNIXWARE_DISKLABEL
496 /*
497 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
498 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
499 */
500
501 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
502 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
503 #define UNIXWARE_NUMSLICE 16
504 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
505
506 struct unixware_slice {
507 __le16 s_label; /* label */
508 __le16 s_flags; /* permission flags */
509 __le32 start_sect; /* starting sector */
510 __le32 nr_sects; /* number of sectors in slice */
511 };
512
513 struct unixware_disklabel {
514 __le32 d_type; /* drive type */
515 __le32 d_magic; /* the magic number */
516 __le32 d_version; /* version number */
517 char d_serial[12]; /* serial number of the device */
518 __le32 d_ncylinders; /* # of data cylinders per device */
519 __le32 d_ntracks; /* # of tracks per cylinder */
520 __le32 d_nsectors; /* # of data sectors per track */
521 __le32 d_secsize; /* # of bytes per sector */
522 __le32 d_part_start; /* # of first sector of this partition */
523 __le32 d_unknown1[12]; /* ? */
524 __le32 d_alt_tbl; /* byte offset of alternate table */
525 __le32 d_alt_len; /* byte length of alternate table */
526 __le32 d_phys_cyl; /* # of physical cylinders per device */
527 __le32 d_phys_trk; /* # of physical tracks per cylinder */
528 __le32 d_phys_sec; /* # of physical sectors per track */
529 __le32 d_phys_bytes; /* # of physical bytes per sector */
530 __le32 d_unknown2; /* ? */
531 __le32 d_unknown3; /* ? */
532 __le32 d_pad[8]; /* pad */
533
534 struct unixware_vtoc {
535 __le32 v_magic; /* the magic number */
536 __le32 v_version; /* version number */
537 char v_name[8]; /* volume name */
538 __le16 v_nslices; /* # of slices */
539 __le16 v_unknown1; /* ? */
540 __le32 v_reserved[10]; /* reserved */
541 struct unixware_slice
542 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
543 } vtoc;
544
545 }; /* 408 */
546
547 #endif /* CONFIG_UNIXWARE_DISKLABEL */
548
549 #ifdef CONFIG_MINIX_SUBPARTITION
550 # define MINIX_NR_SUBPARTITIONS 4
551 #endif /* CONFIG_MINIX_SUBPARTITION */
552
553 #define ADDPART_FLAG_NONE 0
554 #define ADDPART_FLAG_RAID 1
555 #define ADDPART_FLAG_WHOLEDISK 2
556
557 extern dev_t blk_lookup_devt(const char *name, int partno);
558 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
559
560 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
561 extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
562 extern void delete_partition(struct gendisk *, int);
563 extern void printk_all_partitions(void);
564
565 extern struct gendisk *alloc_disk_node(int minors, int node_id);
566 extern struct gendisk *alloc_disk(int minors);
567 extern struct kobject *get_disk(struct gendisk *disk);
568 extern void put_disk(struct gendisk *disk);
569 extern void blk_register_region(dev_t devt, unsigned long range,
570 struct module *module,
571 struct kobject *(*probe)(dev_t, int *, void *),
572 int (*lock)(dev_t, void *),
573 void *data);
574 extern void blk_unregister_region(dev_t devt, unsigned long range);
575
576 #else /* CONFIG_BLOCK */
577
578 static inline void printk_all_partitions(void) { }
579
580 static inline dev_t blk_lookup_devt(const char *name, int partno)
581 {
582 dev_t devt = MKDEV(0, 0);
583 return devt;
584 }
585
586 #endif /* CONFIG_BLOCK */
587
588 #endif /* _LINUX_GENHD_H */
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