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 };
145
146 /*
147 * Macros to operate on percpu disk statistics:
148 *
149 * The __ variants should only be called in critical sections. The full
150 * variants disable/enable preemption.
151 */
152 static inline struct hd_struct *get_part(struct gendisk *gendiskp,
153 sector_t sector)
154 {
155 struct hd_struct *part;
156 int i;
157 for (i = 0; i < gendiskp->minors - 1; i++) {
158 part = gendiskp->part[i];
159 if (part && part->start_sect <= sector
160 && sector < part->start_sect + part->nr_sects)
161 return part;
162 }
163 return NULL;
164 }
165
166 #ifdef CONFIG_SMP
167 #define __disk_stat_add(gendiskp, field, addnd) \
168 do { \
169 preempt_disable(); \
170 (per_cpu_ptr(gendiskp->dkstats, \
171 smp_processor_id())->field += addnd); \
172 preempt_enable(); \
173 } while (0)
174
175 #define disk_stat_read(gendiskp, field) \
176 ({ \
177 typeof(gendiskp->dkstats->field) res = 0; \
178 int i; \
179 for_each_possible_cpu(i) \
180 res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
181 res; \
182 })
183
184 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
185 int i;
186 for_each_possible_cpu(i)
187 memset(per_cpu_ptr(gendiskp->dkstats, i), value,
188 sizeof (struct disk_stats));
189 }
190
191 #define __part_stat_add(part, field, addnd) \
192 do { \
193 preempt_disable(); \
194 (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd); \
195 preempt_enable(); \
196 } while (0)
197
198 #define __all_stat_add(gendiskp, field, addnd, sector) \
199 ({ \
200 struct hd_struct *part = get_part(gendiskp, sector); \
201 if (part) \
202 __part_stat_add(part, field, addnd); \
203 __disk_stat_add(gendiskp, field, addnd); \
204 })
205
206 #define part_stat_read(part, field) \
207 ({ \
208 typeof(part->dkstats->field) res = 0; \
209 int i; \
210 for_each_possible_cpu(i) \
211 res += per_cpu_ptr(part->dkstats, i)->field; \
212 res; \
213 })
214
215 static inline void part_stat_set_all(struct hd_struct *part, int value) {
216 int i;
217 for_each_possible_cpu(i)
218 memset(per_cpu_ptr(part->dkstats, i), value,
219 sizeof(struct disk_stats));
220 }
221
222 #else /* !CONFIG_SMP */
223 #define __disk_stat_add(gendiskp, field, addnd) \
224 (gendiskp->dkstats.field += addnd)
225 #define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
226
227 static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
228 {
229 memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
230 }
231
232 #define __part_stat_add(part, field, addnd) \
233 (part->dkstats.field += addnd)
234
235 #define __all_stat_add(gendiskp, field, addnd, sector) \
236 ({ \
237 struct hd_struct *part = get_part(gendiskp, sector); \
238 if (part) \
239 part->dkstats.field += addnd; \
240 __disk_stat_add(gendiskp, field, addnd); \
241 })
242
243 #define part_stat_read(part, field) (part->dkstats.field)
244
245 static inline void part_stat_set_all(struct hd_struct *part, int value)
246 {
247 memset(&part->dkstats, value, sizeof(struct disk_stats));
248 }
249
250 #endif /* CONFIG_SMP */
251
252 #define disk_stat_add(gendiskp, field, addnd) \
253 do { \
254 preempt_disable(); \
255 __disk_stat_add(gendiskp, field, addnd); \
256 preempt_enable(); \
257 } while (0)
258
259 #define __disk_stat_dec(gendiskp, field) __disk_stat_add(gendiskp, field, -1)
260 #define disk_stat_dec(gendiskp, field) disk_stat_add(gendiskp, field, -1)
261
262 #define __disk_stat_inc(gendiskp, field) __disk_stat_add(gendiskp, field, 1)
263 #define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
264
265 #define __disk_stat_sub(gendiskp, field, subnd) \
266 __disk_stat_add(gendiskp, field, -subnd)
267 #define disk_stat_sub(gendiskp, field, subnd) \
268 disk_stat_add(gendiskp, field, -subnd)
269
270 #define part_stat_add(gendiskp, field, addnd) \
271 do { \
272 preempt_disable(); \
273 __part_stat_add(gendiskp, field, addnd);\
274 preempt_enable(); \
275 } while (0)
276
277 #define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
278 #define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
279
280 #define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
281 #define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
282
283 #define __part_stat_sub(gendiskp, field, subnd) \
284 __part_stat_add(gendiskp, field, -subnd)
285 #define part_stat_sub(gendiskp, field, subnd) \
286 part_stat_add(gendiskp, field, -subnd)
287
288 #define all_stat_add(gendiskp, field, addnd, sector) \
289 do { \
290 preempt_disable(); \
291 __all_stat_add(gendiskp, field, addnd, sector); \
292 preempt_enable(); \
293 } while (0)
294
295 #define __all_stat_dec(gendiskp, field, sector) \
296 __all_stat_add(gendiskp, field, -1, sector)
297 #define all_stat_dec(gendiskp, field, sector) \
298 all_stat_add(gendiskp, field, -1, sector)
299
300 #define __all_stat_inc(gendiskp, field, sector) \
301 __all_stat_add(gendiskp, field, 1, sector)
302 #define all_stat_inc(gendiskp, field, sector) \
303 all_stat_add(gendiskp, field, 1, sector)
304
305 #define __all_stat_sub(gendiskp, field, subnd, sector) \
306 __all_stat_add(gendiskp, field, -subnd, sector)
307 #define all_stat_sub(gendiskp, field, subnd, sector) \
308 all_stat_add(gendiskp, field, -subnd, sector)
309
310 /* Inlines to alloc and free disk stats in struct gendisk */
311 #ifdef CONFIG_SMP
312 static inline int init_disk_stats(struct gendisk *disk)
313 {
314 disk->dkstats = alloc_percpu(struct disk_stats);
315 if (!disk->dkstats)
316 return 0;
317 return 1;
318 }
319
320 static inline void free_disk_stats(struct gendisk *disk)
321 {
322 free_percpu(disk->dkstats);
323 }
324
325 static inline int init_part_stats(struct hd_struct *part)
326 {
327 part->dkstats = alloc_percpu(struct disk_stats);
328 if (!part->dkstats)
329 return 0;
330 return 1;
331 }
332
333 static inline void free_part_stats(struct hd_struct *part)
334 {
335 free_percpu(part->dkstats);
336 }
337
338 #else /* CONFIG_SMP */
339 static inline int init_disk_stats(struct gendisk *disk)
340 {
341 return 1;
342 }
343
344 static inline void free_disk_stats(struct gendisk *disk)
345 {
346 }
347
348 static inline int init_part_stats(struct hd_struct *part)
349 {
350 return 1;
351 }
352
353 static inline void free_part_stats(struct hd_struct *part)
354 {
355 }
356 #endif /* CONFIG_SMP */
357
358 /* drivers/block/ll_rw_blk.c */
359 extern void disk_round_stats(struct gendisk *disk);
360 extern void part_round_stats(struct hd_struct *part);
361
362 /* drivers/block/genhd.c */
363 extern int get_blkdev_list(char *, int);
364 extern void add_disk(struct gendisk *disk);
365 extern void del_gendisk(struct gendisk *gp);
366 extern void unlink_gendisk(struct gendisk *gp);
367 extern struct gendisk *get_gendisk(dev_t dev, int *part);
368
369 extern void set_device_ro(struct block_device *bdev, int flag);
370 extern void set_disk_ro(struct gendisk *disk, int flag);
371
372 /* drivers/char/random.c */
373 extern void add_disk_randomness(struct gendisk *disk);
374 extern void rand_initialize_disk(struct gendisk *disk);
375
376 static inline sector_t get_start_sect(struct block_device *bdev)
377 {
378 return bdev->bd_contains == bdev ? 0 : bdev->bd_part->start_sect;
379 }
380 static inline sector_t get_capacity(struct gendisk *disk)
381 {
382 return disk->capacity;
383 }
384 static inline void set_capacity(struct gendisk *disk, sector_t size)
385 {
386 disk->capacity = size;
387 }
388
389 #ifdef CONFIG_SOLARIS_X86_PARTITION
390
391 #define SOLARIS_X86_NUMSLICE 16
392 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
393
394 struct solaris_x86_slice {
395 __le16 s_tag; /* ID tag of partition */
396 __le16 s_flag; /* permission flags */
397 __le32 s_start; /* start sector no of partition */
398 __le32 s_size; /* # of blocks in partition */
399 };
400
401 struct solaris_x86_vtoc {
402 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
403 __le32 v_sanity; /* to verify vtoc sanity */
404 __le32 v_version; /* layout version */
405 char v_volume[8]; /* volume name */
406 __le16 v_sectorsz; /* sector size in bytes */
407 __le16 v_nparts; /* number of partitions */
408 unsigned int v_reserved[10]; /* free space */
409 struct solaris_x86_slice
410 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
411 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
412 char v_asciilabel[128]; /* for compatibility */
413 };
414
415 #endif /* CONFIG_SOLARIS_X86_PARTITION */
416
417 #ifdef CONFIG_BSD_DISKLABEL
418 /*
419 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
420 * updated by Marc Espie <Marc.Espie@openbsd.org>
421 */
422
423 /* check against BSD src/sys/sys/disklabel.h for consistency */
424
425 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
426 #define BSD_MAXPARTITIONS 16
427 #define OPENBSD_MAXPARTITIONS 16
428 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
429 struct bsd_disklabel {
430 __le32 d_magic; /* the magic number */
431 __s16 d_type; /* drive type */
432 __s16 d_subtype; /* controller/d_type specific */
433 char d_typename[16]; /* type name, e.g. "eagle" */
434 char d_packname[16]; /* pack identifier */
435 __u32 d_secsize; /* # of bytes per sector */
436 __u32 d_nsectors; /* # of data sectors per track */
437 __u32 d_ntracks; /* # of tracks per cylinder */
438 __u32 d_ncylinders; /* # of data cylinders per unit */
439 __u32 d_secpercyl; /* # of data sectors per cylinder */
440 __u32 d_secperunit; /* # of data sectors per unit */
441 __u16 d_sparespertrack; /* # of spare sectors per track */
442 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
443 __u32 d_acylinders; /* # of alt. cylinders per unit */
444 __u16 d_rpm; /* rotational speed */
445 __u16 d_interleave; /* hardware sector interleave */
446 __u16 d_trackskew; /* sector 0 skew, per track */
447 __u16 d_cylskew; /* sector 0 skew, per cylinder */
448 __u32 d_headswitch; /* head switch time, usec */
449 __u32 d_trkseek; /* track-to-track seek, usec */
450 __u32 d_flags; /* generic flags */
451 #define NDDATA 5
452 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
453 #define NSPARE 5
454 __u32 d_spare[NSPARE]; /* reserved for future use */
455 __le32 d_magic2; /* the magic number (again) */
456 __le16 d_checksum; /* xor of data incl. partitions */
457
458 /* filesystem and partition information: */
459 __le16 d_npartitions; /* number of partitions in following */
460 __le32 d_bbsize; /* size of boot area at sn0, bytes */
461 __le32 d_sbsize; /* max size of fs superblock, bytes */
462 struct bsd_partition { /* the partition table */
463 __le32 p_size; /* number of sectors in partition */
464 __le32 p_offset; /* starting sector */
465 __le32 p_fsize; /* filesystem basic fragment size */
466 __u8 p_fstype; /* filesystem type, see below */
467 __u8 p_frag; /* filesystem fragments per block */
468 __le16 p_cpg; /* filesystem cylinders per group */
469 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
470 };
471
472 #endif /* CONFIG_BSD_DISKLABEL */
473
474 #ifdef CONFIG_UNIXWARE_DISKLABEL
475 /*
476 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
477 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
478 */
479
480 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
481 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
482 #define UNIXWARE_NUMSLICE 16
483 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
484
485 struct unixware_slice {
486 __le16 s_label; /* label */
487 __le16 s_flags; /* permission flags */
488 __le32 start_sect; /* starting sector */
489 __le32 nr_sects; /* number of sectors in slice */
490 };
491
492 struct unixware_disklabel {
493 __le32 d_type; /* drive type */
494 __le32 d_magic; /* the magic number */
495 __le32 d_version; /* version number */
496 char d_serial[12]; /* serial number of the device */
497 __le32 d_ncylinders; /* # of data cylinders per device */
498 __le32 d_ntracks; /* # of tracks per cylinder */
499 __le32 d_nsectors; /* # of data sectors per track */
500 __le32 d_secsize; /* # of bytes per sector */
501 __le32 d_part_start; /* # of first sector of this partition */
502 __le32 d_unknown1[12]; /* ? */
503 __le32 d_alt_tbl; /* byte offset of alternate table */
504 __le32 d_alt_len; /* byte length of alternate table */
505 __le32 d_phys_cyl; /* # of physical cylinders per device */
506 __le32 d_phys_trk; /* # of physical tracks per cylinder */
507 __le32 d_phys_sec; /* # of physical sectors per track */
508 __le32 d_phys_bytes; /* # of physical bytes per sector */
509 __le32 d_unknown2; /* ? */
510 __le32 d_unknown3; /* ? */
511 __le32 d_pad[8]; /* pad */
512
513 struct unixware_vtoc {
514 __le32 v_magic; /* the magic number */
515 __le32 v_version; /* version number */
516 char v_name[8]; /* volume name */
517 __le16 v_nslices; /* # of slices */
518 __le16 v_unknown1; /* ? */
519 __le32 v_reserved[10]; /* reserved */
520 struct unixware_slice
521 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
522 } vtoc;
523
524 }; /* 408 */
525
526 #endif /* CONFIG_UNIXWARE_DISKLABEL */
527
528 #ifdef CONFIG_MINIX_SUBPARTITION
529 # define MINIX_NR_SUBPARTITIONS 4
530 #endif /* CONFIG_MINIX_SUBPARTITION */
531
532 #define ADDPART_FLAG_NONE 0
533 #define ADDPART_FLAG_RAID 1
534 #define ADDPART_FLAG_WHOLEDISK 2
535
536 extern dev_t blk_lookup_devt(const char *name);
537 extern char *disk_name (struct gendisk *hd, int part, char *buf);
538
539 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
540 extern void add_partition(struct gendisk *, int, sector_t, sector_t, int);
541 extern void delete_partition(struct gendisk *, int);
542 extern void printk_all_partitions(void);
543
544 extern struct gendisk *alloc_disk_node(int minors, int node_id);
545 extern struct gendisk *alloc_disk(int minors);
546 extern struct kobject *get_disk(struct gendisk *disk);
547 extern void put_disk(struct gendisk *disk);
548 extern void blk_register_region(dev_t devt, unsigned long range,
549 struct module *module,
550 struct kobject *(*probe)(dev_t, int *, void *),
551 int (*lock)(dev_t, void *),
552 void *data);
553 extern void blk_unregister_region(dev_t devt, unsigned long range);
554
555 static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
556 {
557 return bdget(MKDEV(disk->major, disk->first_minor) + index);
558 }
559
560 #else /* CONFIG_BLOCK */
561
562 static inline void printk_all_partitions(void) { }
563
564 static inline dev_t blk_lookup_devt(const char *name)
565 {
566 dev_t devt = MKDEV(0, 0);
567 return devt;
568 }
569
570 #endif /* CONFIG_BLOCK */
571
572 #endif /* _LINUX_GENHD_H */
573
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