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new retransmit part 3
[cor_2_6_31.git] / include / linux / genhd.h
blob45fc320a53c6f002fbb466d2b38315254b19ff94
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 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;
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 /* allow extended devt */
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
122 struct 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
128 struct 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
135 struct gendisk {
136 /* major, first_minor and minors are input parameters only,
137 * don't use directly. Use disk_devt() and disk_max_parts().
138 */
139 int major; /* major number of driver */
140 int first_minor;
141 int minors; /* maximum number of minors, =1 for
142 * disks that can't be partitioned. */
143
144 char disk_name[DISK_NAME_LEN]; /* name of major driver */
145 char *(*nodename)(struct gendisk *gd);
146 /* Array of pointers to partitions indexed by partno.
147 * Protected with matching bdev lock but stat and other
148 * non-critical accesses use RCU. Always access through
149 * helpers.
150 */
151 struct disk_part_tbl *part_tbl;
152 struct hd_struct part0;
153
154 struct block_device_operations *fops;
155 struct request_queue *queue;
156 void *private_data;
157
158 int flags;
159 struct device *driverfs_dev; // FIXME: remove
160 struct kobject *slave_dir;
161
162 struct timer_rand_state *random;
163
164 atomic_t sync_io; /* RAID */
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
172 static 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
183 static 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
190 static inline bool disk_partitionable(struct gendisk *disk)
191 {
192 return disk_max_parts(disk) > 1;
193 }
194
195 static inline dev_t disk_devt(struct gendisk *disk)
196 {
197 return disk_to_dev(disk)->devt;
198 }
199
200 static inline dev_t part_devt(struct hd_struct *part)
201 {
202 return part_to_dev(part)->devt;
203 }
204
205 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
206
207 static 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 * Smarter partition iterator without context limits.
215 */
216 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
217 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
218 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
219 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
220
221 struct disk_part_iter {
222 struct gendisk *disk;
223 struct hd_struct *part;
224 int idx;
225 unsigned int flags;
226 };
227
228 extern void disk_part_iter_init(struct disk_part_iter *piter,
229 struct gendisk *disk, unsigned int flags);
230 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
231 extern void disk_part_iter_exit(struct disk_part_iter *piter);
232
233 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
234 sector_t sector);
235
236 /*
237 * Macros to operate on percpu disk statistics:
238 *
239 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
240 * and should be called between disk_stat_lock() and
241 * disk_stat_unlock().
242 *
243 * part_stat_read() can be called at any time.
244 *
245 * part_stat_{add|set_all}() and {init|free}_part_stats are for
246 * internal use only.
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
264 static 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
273 static 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
281 static inline void free_part_stats(struct hd_struct *part)
282 {
283 free_percpu(part->dkstats);
284 }
285
286 #else /* !CONFIG_SMP */
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
295 static inline void part_stat_set_all(struct hd_struct *part, int value)
296 {
297 memset(&part->dkstats, value, sizeof(struct disk_stats));
298 }
299
300 static inline int init_part_stats(struct hd_struct *part)
301 {
302 return 1;
303 }
304
305 static inline void free_part_stats(struct hd_struct *part)
306 {
307 }
308
309 #endif /* CONFIG_SMP */
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
325 static inline void part_inc_in_flight(struct hd_struct *part)
326 {
327 part->in_flight++;
328 if (part->partno)
329 part_to_disk(part)->part0.in_flight++;
330 }
331
332 static inline void part_dec_in_flight(struct hd_struct *part)
333 {
334 part->in_flight--;
335 if (part->partno)
336 part_to_disk(part)->part0.in_flight--;
337 }
338
339 /* block/blk-core.c */
340 extern void part_round_stats(int cpu, struct hd_struct *part);
341
342 /* block/genhd.c */
343 extern void add_disk(struct gendisk *disk);
344 extern void del_gendisk(struct gendisk *gp);
345 extern void unlink_gendisk(struct gendisk *gp);
346 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
347 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
348
349 extern void set_device_ro(struct block_device *bdev, int flag);
350 extern void set_disk_ro(struct gendisk *disk, int flag);
351
352 static inline int get_disk_ro(struct gendisk *disk)
353 {
354 return disk->part0.policy;
355 }
356
357 /* drivers/char/random.c */
358 extern void add_disk_randomness(struct gendisk *disk);
359 extern void rand_initialize_disk(struct gendisk *disk);
360
361 static inline sector_t get_start_sect(struct block_device *bdev)
362 {
363 return bdev->bd_part->start_sect;
364 }
365 static inline sector_t get_capacity(struct gendisk *disk)
366 {
367 return disk->part0.nr_sects;
368 }
369 static inline void set_capacity(struct gendisk *disk, sector_t size)
370 {
371 disk->part0.nr_sects = size;
372 }
373
374 #ifdef CONFIG_SOLARIS_X86_PARTITION
375
376 #define SOLARIS_X86_NUMSLICE 16
377 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
378
379 struct solaris_x86_slice {
380 __le16 s_tag; /* ID tag of partition */
381 __le16 s_flag; /* permission flags */
382 __le32 s_start; /* start sector no of partition */
383 __le32 s_size; /* # of blocks in partition */
384 };
385
386 struct solaris_x86_vtoc {
387 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
388 __le32 v_sanity; /* to verify vtoc sanity */
389 __le32 v_version; /* layout version */
390 char v_volume[8]; /* volume name */
391 __le16 v_sectorsz; /* sector size in bytes */
392 __le16 v_nparts; /* number of partitions */
393 unsigned int v_reserved[10]; /* free space */
394 struct solaris_x86_slice
395 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
396 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
397 char v_asciilabel[128]; /* for compatibility */
398 };
399
400 #endif /* CONFIG_SOLARIS_X86_PARTITION */
401
402 #ifdef CONFIG_BSD_DISKLABEL
403 /*
404 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
405 * updated by Marc Espie <Marc.Espie@openbsd.org>
406 */
407
408 /* check against BSD src/sys/sys/disklabel.h for consistency */
409
410 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
411 #define BSD_MAXPARTITIONS 16
412 #define OPENBSD_MAXPARTITIONS 16
413 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
414 struct bsd_disklabel {
415 __le32 d_magic; /* the magic number */
416 __s16 d_type; /* drive type */
417 __s16 d_subtype; /* controller/d_type specific */
418 char d_typename[16]; /* type name, e.g. "eagle" */
419 char d_packname[16]; /* pack identifier */
420 __u32 d_secsize; /* # of bytes per sector */
421 __u32 d_nsectors; /* # of data sectors per track */
422 __u32 d_ntracks; /* # of tracks per cylinder */
423 __u32 d_ncylinders; /* # of data cylinders per unit */
424 __u32 d_secpercyl; /* # of data sectors per cylinder */
425 __u32 d_secperunit; /* # of data sectors per unit */
426 __u16 d_sparespertrack; /* # of spare sectors per track */
427 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
428 __u32 d_acylinders; /* # of alt. cylinders per unit */
429 __u16 d_rpm; /* rotational speed */
430 __u16 d_interleave; /* hardware sector interleave */
431 __u16 d_trackskew; /* sector 0 skew, per track */
432 __u16 d_cylskew; /* sector 0 skew, per cylinder */
433 __u32 d_headswitch; /* head switch time, usec */
434 __u32 d_trkseek; /* track-to-track seek, usec */
435 __u32 d_flags; /* generic flags */
436 #define NDDATA 5
437 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
438 #define NSPARE 5
439 __u32 d_spare[NSPARE]; /* reserved for future use */
440 __le32 d_magic2; /* the magic number (again) */
441 __le16 d_checksum; /* xor of data incl. partitions */
442
443 /* filesystem and partition information: */
444 __le16 d_npartitions; /* number of partitions in following */
445 __le32 d_bbsize; /* size of boot area at sn0, bytes */
446 __le32 d_sbsize; /* max size of fs superblock, bytes */
447 struct bsd_partition { /* the partition table */
448 __le32 p_size; /* number of sectors in partition */
449 __le32 p_offset; /* starting sector */
450 __le32 p_fsize; /* filesystem basic fragment size */
451 __u8 p_fstype; /* filesystem type, see below */
452 __u8 p_frag; /* filesystem fragments per block */
453 __le16 p_cpg; /* filesystem cylinders per group */
454 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
455 };
456
457 #endif /* CONFIG_BSD_DISKLABEL */
458
459 #ifdef CONFIG_UNIXWARE_DISKLABEL
460 /*
461 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
462 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
463 */
464
465 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
466 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
467 #define UNIXWARE_NUMSLICE 16
468 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
469
470 struct unixware_slice {
471 __le16 s_label; /* label */
472 __le16 s_flags; /* permission flags */
473 __le32 start_sect; /* starting sector */
474 __le32 nr_sects; /* number of sectors in slice */
475 };
476
477 struct unixware_disklabel {
478 __le32 d_type; /* drive type */
479 __le32 d_magic; /* the magic number */
480 __le32 d_version; /* version number */
481 char d_serial[12]; /* serial number of the device */
482 __le32 d_ncylinders; /* # of data cylinders per device */
483 __le32 d_ntracks; /* # of tracks per cylinder */
484 __le32 d_nsectors; /* # of data sectors per track */
485 __le32 d_secsize; /* # of bytes per sector */
486 __le32 d_part_start; /* # of first sector of this partition */
487 __le32 d_unknown1[12]; /* ? */
488 __le32 d_alt_tbl; /* byte offset of alternate table */
489 __le32 d_alt_len; /* byte length of alternate table */
490 __le32 d_phys_cyl; /* # of physical cylinders per device */
491 __le32 d_phys_trk; /* # of physical tracks per cylinder */
492 __le32 d_phys_sec; /* # of physical sectors per track */
493 __le32 d_phys_bytes; /* # of physical bytes per sector */
494 __le32 d_unknown2; /* ? */
495 __le32 d_unknown3; /* ? */
496 __le32 d_pad[8]; /* pad */
497
498 struct unixware_vtoc {
499 __le32 v_magic; /* the magic number */
500 __le32 v_version; /* version number */
501 char v_name[8]; /* volume name */
502 __le16 v_nslices; /* # of slices */
503 __le16 v_unknown1; /* ? */
504 __le32 v_reserved[10]; /* reserved */
505 struct unixware_slice
506 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
507 } vtoc;
508
509 }; /* 408 */
510
511 #endif /* CONFIG_UNIXWARE_DISKLABEL */
512
513 #ifdef CONFIG_MINIX_SUBPARTITION
514 # define MINIX_NR_SUBPARTITIONS 4
515 #endif /* CONFIG_MINIX_SUBPARTITION */
516
517 #define ADDPART_FLAG_NONE 0
518 #define ADDPART_FLAG_RAID 1
519 #define ADDPART_FLAG_WHOLEDISK 2
520
521 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
522 extern void blk_free_devt(dev_t devt);
523 extern dev_t blk_lookup_devt(const char *name, int partno);
524 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
525
526 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
527 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
528 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
529 int partno, sector_t start,
530 sector_t len, int flags);
531 extern void delete_partition(struct gendisk *, int);
532 extern void printk_all_partitions(void);
533
534 extern struct gendisk *alloc_disk_node(int minors, int node_id);
535 extern struct gendisk *alloc_disk(int minors);
536 extern struct kobject *get_disk(struct gendisk *disk);
537 extern void put_disk(struct gendisk *disk);
538 extern void blk_register_region(dev_t devt, unsigned long range,
539 struct module *module,
540 struct kobject *(*probe)(dev_t, int *, void *),
541 int (*lock)(dev_t, void *),
542 void *data);
543 extern void blk_unregister_region(dev_t devt, unsigned long range);
544
545 extern ssize_t part_size_show(struct device *dev,
546 struct device_attribute *attr, char *buf);
547 extern ssize_t part_stat_show(struct device *dev,
548 struct device_attribute *attr, char *buf);
549 #ifdef CONFIG_FAIL_MAKE_REQUEST
550 extern ssize_t part_fail_show(struct device *dev,
551 struct device_attribute *attr, char *buf);
552 extern ssize_t part_fail_store(struct device *dev,
553 struct device_attribute *attr,
554 const char *buf, size_t count);
555 #endif /* CONFIG_FAIL_MAKE_REQUEST */
556
557 #else /* CONFIG_BLOCK */
558
559 static inline void printk_all_partitions(void) { }
560
561 static inline dev_t blk_lookup_devt(const char *name, int partno)
562 {
563 dev_t devt = MKDEV(0, 0);
564 return devt;
565 }
566
567 #endif /* CONFIG_BLOCK */
568
569 #endif /* _LINUX_GENHD_H */
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