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block: Block layer data integrity support
[deliverable/linux.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
114 struct gendisk {
115 int major; /* major number of driver */
116 int first_minor;
117 int minors; /* maximum number of minors, =1 for
118 * disks that can't be partitioned. */
119 char disk_name[32]; /* name of major driver */
120 struct hd_struct **part; /* [indexed by minor] */
121 struct block_device_operations *fops;
122 struct request_queue *queue;
123 void *private_data;
124 sector_t capacity;
125
126 int flags;
127 struct device *driverfs_dev; // FIXME: remove
128 struct device dev;
129 struct kobject *holder_dir;
130 struct kobject *slave_dir;
131
132 struct timer_rand_state *random;
133 int policy;
134
135 atomic_t sync_io; /* RAID */
136 unsigned long stamp;
137 int in_flight;
138 #ifdef CONFIG_SMP
139 struct disk_stats *dkstats;
140 #else
141 struct disk_stats dkstats;
142 #endif
143 struct work_struct async_notify;
144 #ifdef CONFIG_BLK_DEV_INTEGRITY
145 struct blk_integrity *integrity;
146 #endif
147 };
148
149 /*
150 * Macros to operate on percpu disk statistics:
151 *
152 * The __ variants should only be called in critical sections. The full
153 * variants disable/enable preemption.
154 */
155 static inline struct hd_struct *get_part(struct gendisk *gendiskp,
156 sector_t sector)
157 {
158 struct hd_struct *part;
159 int i;
160 for (i = 0; i < gendiskp->minors - 1; i++) {
161 part = gendiskp->part[i];
162 if (part && part->start_sect <= sector
163 && sector < part->start_sect + part->nr_sects)
164 return part;
165 }
166 return NULL;
167 }
168
169 #ifdef CONFIG_SMP
170 #define __disk_stat_add(gendiskp, field, addnd) \
171 (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
172
173 #define disk_stat_read(gendiskp, field) \
174 ({ \
175 typeof(gendiskp->dkstats->field) res = 0; \
176 int i; \
177 for_each_possible_cpu(i) \
178 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
179 res; \
180 })
181
182 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
183 int i;
184
185 for_each_possible_cpu(i)
186 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
187 sizeof(struct disk_stats));
188 }
189
190 #define __part_stat_add(part, field, addnd) \
191 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
192
193 #define __all_stat_add(gendiskp, part, field, addnd, sector) \
194 ({ \
195 if (part) \
196 __part_stat_add(part, field, addnd); \
197 __disk_stat_add(gendiskp, field, addnd); \
198 })
199
200 #define part_stat_read(part, field) \
201 ({ \
202 typeof(part->dkstats->field) res = 0; \
203 int i; \
204 for_each_possible_cpu(i) \
205 res += per_cpu_ptr(part->dkstats, i)->field; \
206 res; \
207 })
208
209 static inline void part_stat_set_all(struct hd_struct *part, int value)
210 {
211 int i;
212
213 for_each_possible_cpu(i)
214 memset(per_cpu_ptr(part->dkstats, i), value,
215 sizeof(struct disk_stats));
216 }
217
218 #else /* !CONFIG_SMP */
219 #define __disk_stat_add(gendiskp, field, addnd) \
220 (gendiskp->dkstats.field += addnd)
221 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
222
223 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
224 {
225 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
226 }
227
228 #define __part_stat_add(part, field, addnd) \
229 (part->dkstats.field += addnd)
230
231 #define __all_stat_add(gendiskp, part, field, addnd, sector) \
232 ({ \
233 if (part) \
234 part->dkstats.field += addnd; \
235 __disk_stat_add(gendiskp, field, addnd); \
236 })
237
238 #define part_stat_read(part, field) (part->dkstats.field)
239
240 static inline void part_stat_set_all(struct hd_struct *part, int value)
241 {
242 memset(&part->dkstats, value, sizeof(struct disk_stats));
243 }
244
245 #endif /* CONFIG_SMP */
246
247 #define disk_stat_add(gendiskp, field, addnd) \
248 do { \
249 preempt_disable(); \
250 __disk_stat_add(gendiskp, field, addnd); \
251 preempt_enable(); \
252 } while (0)
253
254 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
255 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
256
257 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
258 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
259
260 #define __disk_stat_sub(gendiskp, field, subnd) \
261 __disk_stat_add(gendiskp, field, -subnd)
262 #define disk_stat_sub(gendiskp, field, subnd) \
263 disk_stat_add(gendiskp, field, -subnd)
264
265 #define part_stat_add(gendiskp, field, addnd) \
266 do { \
267 preempt_disable(); \
268 __part_stat_add(gendiskp, field, addnd);\
269 preempt_enable(); \
270 } while (0)
271
272 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
273 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
274
275 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
276 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
277
278 #define __part_stat_sub(gendiskp, field, subnd) \
279 __part_stat_add(gendiskp, field, -subnd)
280 #define part_stat_sub(gendiskp, field, subnd) \
281 part_stat_add(gendiskp, field, -subnd)
282
283 #define all_stat_add(gendiskp, part, field, addnd, sector) \
284 do { \
285 preempt_disable(); \
286 __all_stat_add(gendiskp, part, field, addnd, sector); \
287 preempt_enable(); \
288 } while (0)
289
290 #define __all_stat_dec(gendiskp, field, sector) \
291 __all_stat_add(gendiskp, field, -1, sector)
292 #define all_stat_dec(gendiskp, field, sector) \
293 all_stat_add(gendiskp, field, -1, sector)
294
295 #define __all_stat_inc(gendiskp, part, field, sector) \
296 __all_stat_add(gendiskp, part, field, 1, sector)
297 #define all_stat_inc(gendiskp, part, field, sector) \
298 all_stat_add(gendiskp, part, field, 1, sector)
299
300 #define __all_stat_sub(gendiskp, part, field, subnd, sector) \
301 __all_stat_add(gendiskp, part, field, -subnd, sector)
302 #define all_stat_sub(gendiskp, part, field, subnd, sector) \
303 all_stat_add(gendiskp, part, field, -subnd, sector)
304
305 /* Inlines to alloc and free disk stats in struct gendisk */
306 #ifdef CONFIG_SMP
307 static inline int init_disk_stats(struct gendisk *disk)
308 {
309 disk->dkstats = alloc_percpu(struct disk_stats);
310 if (!disk->dkstats)
311 return 0;
312 return 1;
313 }
314
315 static inline void free_disk_stats(struct gendisk *disk)
316 {
317 free_percpu(disk->dkstats);
318 }
319
320 static inline int init_part_stats(struct hd_struct *part)
321 {
322 part->dkstats = alloc_percpu(struct disk_stats);
323 if (!part->dkstats)
324 return 0;
325 return 1;
326 }
327
328 static inline void free_part_stats(struct hd_struct *part)
329 {
330 free_percpu(part->dkstats);
331 }
332
333 #else /* CONFIG_SMP */
334 static inline int init_disk_stats(struct gendisk *disk)
335 {
336 return 1;
337 }
338
339 static inline void free_disk_stats(struct gendisk *disk)
340 {
341 }
342
343 static inline int init_part_stats(struct hd_struct *part)
344 {
345 return 1;
346 }
347
348 static inline void free_part_stats(struct hd_struct *part)
349 {
350 }
351 #endif /* CONFIG_SMP */
352
353 /* drivers/block/ll_rw_blk.c */
354 extern void disk_round_stats(struct gendisk *disk);
355 extern void part_round_stats(struct hd_struct *part);
356
357 /* drivers/block/genhd.c */
358 extern int get_blkdev_list(char *, int);
359 extern void add_disk(struct gendisk *disk);
360 extern void del_gendisk(struct gendisk *gp);
361 extern void unlink_gendisk(struct gendisk *gp);
362 extern struct gendisk *get_gendisk(dev_t dev, int *part);
363
364 extern void set_device_ro(struct block_device *bdev, int flag);
365 extern void set_disk_ro(struct gendisk *disk, int flag);
366
367 /* drivers/char/random.c */
368 extern void add_disk_randomness(struct gendisk *disk);
369 extern void rand_initialize_disk(struct gendisk *disk);
370
371 static inline sector_t get_start_sect(struct block_device *bdev)
372 {
373 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
374 }
375 static inline sector_t get_capacity(struct gendisk *disk)
376 {
377 return disk->capacity;
378 }
379 static inline void set_capacity(struct gendisk *disk, sector_t size)
380 {
381 disk->capacity = size;
382 }
383
384 #ifdef CONFIG_SOLARIS_X86_PARTITION
385
386 #define SOLARIS_X86_NUMSLICE 16
387 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
388
389 struct solaris_x86_slice {
390 __le16 s_tag; /* ID tag of partition */
391 __le16 s_flag; /* permission flags */
392 __le32 s_start; /* start sector no of partition */
393 __le32 s_size; /* # of blocks in partition */
394 };
395
396 struct solaris_x86_vtoc {
397 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
398 __le32 v_sanity; /* to verify vtoc sanity */
399 __le32 v_version; /* layout version */
400 char v_volume[8]; /* volume name */
401 __le16 v_sectorsz; /* sector size in bytes */
402 __le16 v_nparts; /* number of partitions */
403 unsigned int v_reserved[10]; /* free space */
404 struct solaris_x86_slice
405 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
406 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
407 char v_asciilabel[128]; /* for compatibility */
408 };
409
410 #endif /* CONFIG_SOLARIS_X86_PARTITION */
411
412 #ifdef CONFIG_BSD_DISKLABEL
413 /*
414 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
415 * updated by Marc Espie <Marc.Espie@openbsd.org>
416 */
417
418 /* check against BSD src/sys/sys/disklabel.h for consistency */
419
420 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
421 #define BSD_MAXPARTITIONS 16
422 #define OPENBSD_MAXPARTITIONS 16
423 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
424 struct bsd_disklabel {
425 __le32 d_magic; /* the magic number */
426 __s16 d_type; /* drive type */
427 __s16 d_subtype; /* controller/d_type specific */
428 char d_typename[16]; /* type name, e.g. "eagle" */
429 char d_packname[16]; /* pack identifier */
430 __u32 d_secsize; /* # of bytes per sector */
431 __u32 d_nsectors; /* # of data sectors per track */
432 __u32 d_ntracks; /* # of tracks per cylinder */
433 __u32 d_ncylinders; /* # of data cylinders per unit */
434 __u32 d_secpercyl; /* # of data sectors per cylinder */
435 __u32 d_secperunit; /* # of data sectors per unit */
436 __u16 d_sparespertrack; /* # of spare sectors per track */
437 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
438 __u32 d_acylinders; /* # of alt. cylinders per unit */
439 __u16 d_rpm; /* rotational speed */
440 __u16 d_interleave; /* hardware sector interleave */
441 __u16 d_trackskew; /* sector 0 skew, per track */
442 __u16 d_cylskew; /* sector 0 skew, per cylinder */
443 __u32 d_headswitch; /* head switch time, usec */
444 __u32 d_trkseek; /* track-to-track seek, usec */
445 __u32 d_flags; /* generic flags */
446 #define NDDATA 5
447 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
448 #define NSPARE 5
449 __u32 d_spare[NSPARE]; /* reserved for future use */
450 __le32 d_magic2; /* the magic number (again) */
451 __le16 d_checksum; /* xor of data incl. partitions */
452
453 /* filesystem and partition information: */
454 __le16 d_npartitions; /* number of partitions in following */
455 __le32 d_bbsize; /* size of boot area at sn0, bytes */
456 __le32 d_sbsize; /* max size of fs superblock, bytes */
457 struct bsd_partition { /* the partition table */
458 __le32 p_size; /* number of sectors in partition */
459 __le32 p_offset; /* starting sector */
460 __le32 p_fsize; /* filesystem basic fragment size */
461 __u8 p_fstype; /* filesystem type, see below */
462 __u8 p_frag; /* filesystem fragments per block */
463 __le16 p_cpg; /* filesystem cylinders per group */
464 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
465 };
466
467 #endif /* CONFIG_BSD_DISKLABEL */
468
469 #ifdef CONFIG_UNIXWARE_DISKLABEL
470 /*
471 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
472 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
473 */
474
475 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
476 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
477 #define UNIXWARE_NUMSLICE 16
478 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
479
480 struct unixware_slice {
481 __le16 s_label; /* label */
482 __le16 s_flags; /* permission flags */
483 __le32 start_sect; /* starting sector */
484 __le32 nr_sects; /* number of sectors in slice */
485 };
486
487 struct unixware_disklabel {
488 __le32 d_type; /* drive type */
489 __le32 d_magic; /* the magic number */
490 __le32 d_version; /* version number */
491 char d_serial[12]; /* serial number of the device */
492 __le32 d_ncylinders; /* # of data cylinders per device */
493 __le32 d_ntracks; /* # of tracks per cylinder */
494 __le32 d_nsectors; /* # of data sectors per track */
495 __le32 d_secsize; /* # of bytes per sector */
496 __le32 d_part_start; /* # of first sector of this partition */
497 __le32 d_unknown1[12]; /* ? */
498 __le32 d_alt_tbl; /* byte offset of alternate table */
499 __le32 d_alt_len; /* byte length of alternate table */
500 __le32 d_phys_cyl; /* # of physical cylinders per device */
501 __le32 d_phys_trk; /* # of physical tracks per cylinder */
502 __le32 d_phys_sec; /* # of physical sectors per track */
503 __le32 d_phys_bytes; /* # of physical bytes per sector */
504 __le32 d_unknown2; /* ? */
505 __le32 d_unknown3; /* ? */
506 __le32 d_pad[8]; /* pad */
507
508 struct unixware_vtoc {
509 __le32 v_magic; /* the magic number */
510 __le32 v_version; /* version number */
511 char v_name[8]; /* volume name */
512 __le16 v_nslices; /* # of slices */
513 __le16 v_unknown1; /* ? */
514 __le32 v_reserved[10]; /* reserved */
515 struct unixware_slice
516 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
517 } vtoc;
518
519 }; /* 408 */
520
521 #endif /* CONFIG_UNIXWARE_DISKLABEL */
522
523 #ifdef CONFIG_MINIX_SUBPARTITION
524 # define MINIX_NR_SUBPARTITIONS 4
525 #endif /* CONFIG_MINIX_SUBPARTITION */
526
527 #define ADDPART_FLAG_NONE 0
528 #define ADDPART_FLAG_RAID 1
529 #define ADDPART_FLAG_WHOLEDISK 2
530
531 extern dev_t blk_lookup_devt(const char *name, int part);
532 extern char *disk_name (struct gendisk *hd, int part, char *buf);
533
534 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
535 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
536 extern void delete_partition(struct gendisk *, int);
537 extern void printk_all_partitions(void);
538
539 extern struct gendisk *alloc_disk_node(int minors, int node_id);
540 extern struct gendisk *alloc_disk(int minors);
541 extern struct kobject *get_disk(struct gendisk *disk);
542 extern void put_disk(struct gendisk *disk);
543 extern 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);
548 extern void blk_unregister_region(dev_t devt, unsigned long range);
549
550 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
551 {
552 return bdget(MKDEV(disk->major, disk->first_minor) + index);
553 }
554
555 #else /* CONFIG_BLOCK */
556
557 static inline void printk_all_partitions(void) { }
558
559 static inline dev_t blk_lookup_devt(const char *name, int part)
560 {
561 dev_t devt = MKDEV(0, 0);
562 return devt;
563 }
564
565 #endif /* CONFIG_BLOCK */
566
567 #endif /* _LINUX_GENHD_H */
Linux kernel - Deliverables
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