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 #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
24 extern struct device_type part_type;
25 extern struct kobject *block_depr;
26 extern struct class block_class;
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 #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
68 struct partition {
69 unsigned char boot_ind; /* 0x80 - active */
70 unsigned char head; /* starting head */
71 unsigned char sector; /* starting sector */
72 unsigned char cyl; /* starting cylinder */
73 unsigned char sys_ind; /* What partition type */
74 unsigned char end_head; /* end head */
75 unsigned char end_sector; /* end sector */
76 unsigned char end_cyl; /* end cylinder */
77 __le32 start_sect; /* starting sector counting from 0 */
78 __le32 nr_sects; /* nr of sectors in partition */
79 } __attribute__((packed));
80
81 struct disk_stats {
82 unsigned long sectors[2]; /* READs and WRITEs */
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 struct hd_struct {
91 sector_t start_sect;
92 sector_t nr_sects;
93 struct device __dev;
94 struct kobject *holder_dir;
95 int policy, partno;
96 #ifdef CONFIG_FAIL_MAKE_REQUEST
97 int make_it_fail;
98 #endif
99 unsigned long stamp;
100 int in_flight;
101 #ifdef CONFIG_SMP
102 struct disk_stats *dkstats;
103 #else
104 struct disk_stats dkstats;
105 #endif
106 struct rcu_head rcu_head;
107 };
108
109 #define GENHD_FL_REMOVABLE 1
110 #define GENHD_FL_DRIVERFS 2
111 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
112 #define GENHD_FL_CD 8
113 #define GENHD_FL_UP 16
114 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
115 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
116
117 #define BLK_SCSI_MAX_CMDS (256)
118 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
119
120 struct blk_scsi_cmd_filter {
121 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
122 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
123 struct kobject kobj;
124 };
125
126 struct disk_part_tbl {
127 struct rcu_head rcu_head;
128 int len;
129 struct hd_struct *last_lookup;
130 struct hd_struct *part[];
131 };
132
133 struct gendisk {
134 /* major, first_minor and minors are input parameters only,
135 * don't use directly. Use disk_devt() and disk_max_parts().
136 */
137 int major; /* major number of driver */
138 int first_minor;
139 int minors; /* maximum number of minors, =1 for
140 * disks that can't be partitioned. */
141
142 char disk_name[DISK_NAME_LEN]; /* name of major driver */
143
144 /* Array of pointers to partitions indexed by partno.
145 * Protected with matching bdev lock but stat and other
146 * non-critical accesses use RCU. Always access through
147 * helpers.
148 */
149 struct disk_part_tbl *part_tbl;
150 struct hd_struct part0;
151
152 struct block_device_operations *fops;
153 struct request_queue *queue;
154 void *private_data;
155
156 int flags;
157 struct device *driverfs_dev; // FIXME: remove
158 struct kobject *slave_dir;
159
160 struct timer_rand_state *random;
161
162 atomic_t sync_io; /* RAID */
163 struct work_struct async_notify;
164 #ifdef CONFIG_BLK_DEV_INTEGRITY
165 struct blk_integrity *integrity;
166 #endif
167 int node_id;
168 };
169
part_to_disk(struct hd_struct * part)170 static inline struct gendisk *part_to_disk(struct hd_struct *part)
171 {
172 if (likely(part)) {
173 if (part->partno)
174 return dev_to_disk(part_to_dev(part)->parent);
175 else
176 return dev_to_disk(part_to_dev(part));
177 }
178 return NULL;
179 }
180
disk_max_parts(struct gendisk * disk)181 static inline int disk_max_parts(struct gendisk *disk)
182 {
183 if (disk->flags & GENHD_FL_EXT_DEVT)
184 return DISK_MAX_PARTS;
185 return disk->minors;
186 }
187
disk_partitionable(struct gendisk * disk)188 static inline bool disk_partitionable(struct gendisk *disk)
189 {
190 return disk_max_parts(disk) > 1;
191 }
192
disk_devt(struct gendisk * disk)193 static inline dev_t disk_devt(struct gendisk *disk)
194 {
195 return disk_to_dev(disk)->devt;
196 }
197
part_devt(struct hd_struct * part)198 static inline dev_t part_devt(struct hd_struct *part)
199 {
200 return part_to_dev(part)->devt;
201 }
202
203 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
204
disk_put_part(struct hd_struct * part)205 static inline void disk_put_part(struct hd_struct *part)
206 {
207 if (likely(part))
208 put_device(part_to_dev(part));
209 }
210
211 /*
212 * Smarter partition iterator without context limits.
213 */
214 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
215 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
216 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
217
218 struct disk_part_iter {
219 struct gendisk *disk;
220 struct hd_struct *part;
221 int idx;
222 unsigned int flags;
223 };
224
225 extern void disk_part_iter_init(struct disk_part_iter *piter,
226 struct gendisk *disk, unsigned int flags);
227 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
228 extern void disk_part_iter_exit(struct disk_part_iter *piter);
229
230 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
231 sector_t sector);
232
233 /*
234 * Macros to operate on percpu disk statistics:
235 *
236 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
237 * and should be called between disk_stat_lock() and
238 * disk_stat_unlock().
239 *
240 * part_stat_read() can be called at any time.
241 *
242 * part_stat_{add|set_all}() and {init|free}_part_stats are for
243 * internal use only.
244 */
245 #ifdef CONFIG_SMP
246 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
247 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
248
249 #define __part_stat_add(cpu, part, field, addnd) \
250 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
251
252 #define part_stat_read(part, field) \
253 ({ \
254 typeof((part)->dkstats->field) res = 0; \
255 int i; \
256 for_each_possible_cpu(i) \
257 res += per_cpu_ptr((part)->dkstats, i)->field; \
258 res; \
259 })
260
part_stat_set_all(struct hd_struct * part,int value)261 static inline void part_stat_set_all(struct hd_struct *part, int value)
262 {
263 int i;
264
265 for_each_possible_cpu(i)
266 memset(per_cpu_ptr(part->dkstats, i), value,
267 sizeof(struct disk_stats));
268 }
269
init_part_stats(struct hd_struct * part)270 static inline int init_part_stats(struct hd_struct *part)
271 {
272 part->dkstats = alloc_percpu(struct disk_stats);
273 if (!part->dkstats)
274 return 0;
275 return 1;
276 }
277
free_part_stats(struct hd_struct * part)278 static inline void free_part_stats(struct hd_struct *part)
279 {
280 free_percpu(part->dkstats);
281 }
282
283 #else /* !CONFIG_SMP */
284 #define part_stat_lock() ({ rcu_read_lock(); 0; })
285 #define part_stat_unlock() rcu_read_unlock()
286
287 #define __part_stat_add(cpu, part, field, addnd) \
288 ((part)->dkstats.field += addnd)
289
290 #define part_stat_read(part, field) ((part)->dkstats.field)
291
part_stat_set_all(struct hd_struct * part,int value)292 static inline void part_stat_set_all(struct hd_struct *part, int value)
293 {
294 memset(&part->dkstats, value, sizeof(struct disk_stats));
295 }
296
init_part_stats(struct hd_struct * part)297 static inline int init_part_stats(struct hd_struct *part)
298 {
299 return 1;
300 }
301
free_part_stats(struct hd_struct * part)302 static inline void free_part_stats(struct hd_struct *part)
303 {
304 }
305
306 #endif /* CONFIG_SMP */
307
308 #define part_stat_add(cpu, part, field, addnd) do { \
309 __part_stat_add((cpu), (part), field, addnd); \
310 if ((part)->partno) \
311 __part_stat_add((cpu), &part_to_disk((part))->part0, \
312 field, addnd); \
313 } while (0)
314
315 #define part_stat_dec(cpu, gendiskp, field) \
316 part_stat_add(cpu, gendiskp, field, -1)
317 #define part_stat_inc(cpu, gendiskp, field) \
318 part_stat_add(cpu, gendiskp, field, 1)
319 #define part_stat_sub(cpu, gendiskp, field, subnd) \
320 part_stat_add(cpu, gendiskp, field, -subnd)
321
part_inc_in_flight(struct hd_struct * part)322 static inline void part_inc_in_flight(struct hd_struct *part)
323 {
324 part->in_flight++;
325 if (part->partno)
326 part_to_disk(part)->part0.in_flight++;
327 }
328
part_dec_in_flight(struct hd_struct * part)329 static inline void part_dec_in_flight(struct hd_struct *part)
330 {
331 part->in_flight--;
332 if (part->partno)
333 part_to_disk(part)->part0.in_flight--;
334 }
335
336 /* drivers/block/ll_rw_blk.c */
337 extern void part_round_stats(int cpu, struct hd_struct *part);
338
339 /* drivers/block/genhd.c */
340 extern int get_blkdev_list(char *, int);
341 extern void add_disk(struct gendisk *disk);
342 extern void del_gendisk(struct gendisk *gp);
343 extern void unlink_gendisk(struct gendisk *gp);
344 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
345 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
346
347 extern void set_device_ro(struct block_device *bdev, int flag);
348 extern void set_disk_ro(struct gendisk *disk, int flag);
349
get_disk_ro(struct gendisk * disk)350 static inline int get_disk_ro(struct gendisk *disk)
351 {
352 return disk->part0.policy;
353 }
354
355 /* drivers/char/random.c */
356 extern void add_disk_randomness(struct gendisk *disk);
357 extern void rand_initialize_disk(struct gendisk *disk);
358
get_start_sect(struct block_device * bdev)359 static inline sector_t get_start_sect(struct block_device *bdev)
360 {
361 return bdev->bd_part->start_sect;
362 }
get_capacity(struct gendisk * disk)363 static inline sector_t get_capacity(struct gendisk *disk)
364 {
365 return disk->part0.nr_sects;
366 }
set_capacity(struct gendisk * disk,sector_t size)367 static inline void set_capacity(struct gendisk *disk, sector_t size)
368 {
369 disk->part0.nr_sects = size;
370 }
371
372 #ifdef CONFIG_SOLARIS_X86_PARTITION
373
374 #define SOLARIS_X86_NUMSLICE 16
375 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
376
377 struct solaris_x86_slice {
378 __le16 s_tag; /* ID tag of partition */
379 __le16 s_flag; /* permission flags */
380 __le32 s_start; /* start sector no of partition */
381 __le32 s_size; /* # of blocks in partition */
382 };
383
384 struct solaris_x86_vtoc {
385 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
386 __le32 v_sanity; /* to verify vtoc sanity */
387 __le32 v_version; /* layout version */
388 char v_volume[8]; /* volume name */
389 __le16 v_sectorsz; /* sector size in bytes */
390 __le16 v_nparts; /* number of partitions */
391 unsigned int v_reserved[10]; /* free space */
392 struct solaris_x86_slice
393 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
394 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
395 char v_asciilabel[128]; /* for compatibility */
396 };
397
398 #endif /* CONFIG_SOLARIS_X86_PARTITION */
399
400 #ifdef CONFIG_BSD_DISKLABEL
401 /*
402 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
403 * updated by Marc Espie <Marc.Espie@openbsd.org>
404 */
405
406 /* check against BSD src/sys/sys/disklabel.h for consistency */
407
408 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
409 #define BSD_MAXPARTITIONS 16
410 #define OPENBSD_MAXPARTITIONS 16
411 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
412 struct bsd_disklabel {
413 __le32 d_magic; /* the magic number */
414 __s16 d_type; /* drive type */
415 __s16 d_subtype; /* controller/d_type specific */
416 char d_typename[16]; /* type name, e.g. "eagle" */
417 char d_packname[16]; /* pack identifier */
418 __u32 d_secsize; /* # of bytes per sector */
419 __u32 d_nsectors; /* # of data sectors per track */
420 __u32 d_ntracks; /* # of tracks per cylinder */
421 __u32 d_ncylinders; /* # of data cylinders per unit */
422 __u32 d_secpercyl; /* # of data sectors per cylinder */
423 __u32 d_secperunit; /* # of data sectors per unit */
424 __u16 d_sparespertrack; /* # of spare sectors per track */
425 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
426 __u32 d_acylinders; /* # of alt. cylinders per unit */
427 __u16 d_rpm; /* rotational speed */
428 __u16 d_interleave; /* hardware sector interleave */
429 __u16 d_trackskew; /* sector 0 skew, per track */
430 __u16 d_cylskew; /* sector 0 skew, per cylinder */
431 __u32 d_headswitch; /* head switch time, usec */
432 __u32 d_trkseek; /* track-to-track seek, usec */
433 __u32 d_flags; /* generic flags */
434 #define NDDATA 5
435 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
436 #define NSPARE 5
437 __u32 d_spare[NSPARE]; /* reserved for future use */
438 __le32 d_magic2; /* the magic number (again) */
439 __le16 d_checksum; /* xor of data incl. partitions */
440
441 /* filesystem and partition information: */
442 __le16 d_npartitions; /* number of partitions in following */
443 __le32 d_bbsize; /* size of boot area at sn0, bytes */
444 __le32 d_sbsize; /* max size of fs superblock, bytes */
445 struct bsd_partition { /* the partition table */
446 __le32 p_size; /* number of sectors in partition */
447 __le32 p_offset; /* starting sector */
448 __le32 p_fsize; /* filesystem basic fragment size */
449 __u8 p_fstype; /* filesystem type, see below */
450 __u8 p_frag; /* filesystem fragments per block */
451 __le16 p_cpg; /* filesystem cylinders per group */
452 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
453 };
454
455 #endif /* CONFIG_BSD_DISKLABEL */
456
457 #ifdef CONFIG_UNIXWARE_DISKLABEL
458 /*
459 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
460 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
461 */
462
463 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
464 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
465 #define UNIXWARE_NUMSLICE 16
466 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
467
468 struct unixware_slice {
469 __le16 s_label; /* label */
470 __le16 s_flags; /* permission flags */
471 __le32 start_sect; /* starting sector */
472 __le32 nr_sects; /* number of sectors in slice */
473 };
474
475 struct unixware_disklabel {
476 __le32 d_type; /* drive type */
477 __le32 d_magic; /* the magic number */
478 __le32 d_version; /* version number */
479 char d_serial[12]; /* serial number of the device */
480 __le32 d_ncylinders; /* # of data cylinders per device */
481 __le32 d_ntracks; /* # of tracks per cylinder */
482 __le32 d_nsectors; /* # of data sectors per track */
483 __le32 d_secsize; /* # of bytes per sector */
484 __le32 d_part_start; /* # of first sector of this partition */
485 __le32 d_unknown1[12]; /* ? */
486 __le32 d_alt_tbl; /* byte offset of alternate table */
487 __le32 d_alt_len; /* byte length of alternate table */
488 __le32 d_phys_cyl; /* # of physical cylinders per device */
489 __le32 d_phys_trk; /* # of physical tracks per cylinder */
490 __le32 d_phys_sec; /* # of physical sectors per track */
491 __le32 d_phys_bytes; /* # of physical bytes per sector */
492 __le32 d_unknown2; /* ? */
493 __le32 d_unknown3; /* ? */
494 __le32 d_pad[8]; /* pad */
495
496 struct unixware_vtoc {
497 __le32 v_magic; /* the magic number */
498 __le32 v_version; /* version number */
499 char v_name[8]; /* volume name */
500 __le16 v_nslices; /* # of slices */
501 __le16 v_unknown1; /* ? */
502 __le32 v_reserved[10]; /* reserved */
503 struct unixware_slice
504 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
505 } vtoc;
506
507 }; /* 408 */
508
509 #endif /* CONFIG_UNIXWARE_DISKLABEL */
510
511 #ifdef CONFIG_MINIX_SUBPARTITION
512 # define MINIX_NR_SUBPARTITIONS 4
513 #endif /* CONFIG_MINIX_SUBPARTITION */
514
515 #define ADDPART_FLAG_NONE 0
516 #define ADDPART_FLAG_RAID 1
517 #define ADDPART_FLAG_WHOLEDISK 2
518
519 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
520 extern void blk_free_devt(dev_t devt);
521 extern dev_t blk_lookup_devt(const char *name, int partno);
522 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
523
524 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
525 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
526 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
527 int partno, sector_t start,
528 sector_t len, int flags);
529 extern void delete_partition(struct gendisk *, int);
530 extern void printk_all_partitions(void);
531
532 extern struct gendisk *alloc_disk_node(int minors, int node_id);
533 extern struct gendisk *alloc_disk(int minors);
534 extern struct kobject *get_disk(struct gendisk *disk);
535 extern void put_disk(struct gendisk *disk);
536 extern void blk_register_region(dev_t devt, unsigned long range,
537 struct module *module,
538 struct kobject *(*probe)(dev_t, int *, void *),
539 int (*lock)(dev_t, void *),
540 void *data);
541 extern void blk_unregister_region(dev_t devt, unsigned long range);
542
543 extern ssize_t part_size_show(struct device *dev,
544 struct device_attribute *attr, char *buf);
545 extern ssize_t part_stat_show(struct device *dev,
546 struct device_attribute *attr, char *buf);
547 #ifdef CONFIG_FAIL_MAKE_REQUEST
548 extern ssize_t part_fail_show(struct device *dev,
549 struct device_attribute *attr, char *buf);
550 extern ssize_t part_fail_store(struct device *dev,
551 struct device_attribute *attr,
552 const char *buf, size_t count);
553 #endif /* CONFIG_FAIL_MAKE_REQUEST */
554
555 #else /* CONFIG_BLOCK */
556
printk_all_partitions(void)557 static inline void printk_all_partitions(void) { }
558
blk_lookup_devt(const char * name,int partno)559 static inline dev_t blk_lookup_devt(const char *name, int partno)
560 {
561 dev_t devt = MKDEV(0, 0);
562 return devt;
563 }
564
565 #endif /* CONFIG_BLOCK */
566
567 #endif /* _LINUX_GENHD_H */
568