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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/types.h>
Kay Sieversedfaa7c2007-05-21 22:08:01 +020013#include <linux/kdev_t.h>
Tejun Heoe71bf0d2008-09-03 09:03:02 +020014#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
David Howells93614012006-09-30 20:45:40 +020016#ifdef CONFIG_BLOCK
17
Tejun Heoed9e1982008-08-25 19:56:05 +090018#define kobj_to_dev(k) container_of((k), struct device, kobj)
Tejun Heo548b10e2008-08-29 09:01:47 +020019#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
Tejun Heoed9e1982008-08-25 19:56:05 +090020#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
Tejun Heo548b10e2008-08-29 09:01:47 +020021#define disk_to_dev(disk) (&(disk)->part0.__dev)
Tejun Heoed9e1982008-08-25 19:56:05 +090022#define part_to_dev(part) (&((part)->__dev))
Kay Sieversedfaa7c2007-05-21 22:08:01 +020023
Kay Sieversedfaa7c2007-05-21 22:08:01 +020024extern struct device_type part_type;
25extern struct kobject *block_depr;
26extern struct class block_class;
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028enum {
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
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -080035 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 LINUX_SWAP_PARTITION = 0x82,
Olaf Hering4419d1a2007-02-10 01:45:47 -080038 LINUX_DATA_PARTITION = 0x83,
39 LINUX_LVM_PARTITION = 0x8e,
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 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
Tejun Heo689d6fa2008-08-25 19:56:16 +090058#define DISK_MAX_PARTS 256
Tejun Heo3e1a7ff2008-08-25 19:56:17 +090059#define DISK_NAME_LEN 32
Tejun Heo689d6fa2008-08-25 19:56:16 +090060
David Woodhouse34186ef2006-04-25 14:07:57 +010061#include <linux/major.h>
62#include <linux/device.h>
63#include <linux/smp.h>
64#include <linux/string.h>
65#include <linux/fs.h>
Kristen Carlson Accardi8ce7ad72007-05-23 13:57:38 -070066#include <linux/workqueue.h>
David Woodhouse34186ef2006-04-25 14:07:57 +010067
Linus Torvalds1da177e2005-04-16 15:20:36 -070068struct 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
Jerome Marchandea5c48a2008-02-08 11:04:09 +010081struct 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070090struct hd_struct {
91 sector_t start_sect;
92 sector_t nr_sects;
Martin K. Petersenc72758f2009-05-22 17:17:53 -040093 sector_t alignment_offset;
Martin K. Petersen86b37282009-11-10 11:50:21 +010094 unsigned int discard_alignment;
Tejun Heoed9e1982008-08-25 19:56:05 +090095 struct device __dev;
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -080096 struct kobject *holder_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 int policy, partno;
Akinobu Mitac17bb492006-12-08 02:39:46 -080098#ifdef CONFIG_FAIL_MAKE_REQUEST
99 int make_it_fail;
100#endif
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100101 unsigned long stamp;
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200102 int in_flight[2];
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100103#ifdef CONFIG_SMP
104 struct disk_stats *dkstats;
105#else
106 struct disk_stats dkstats;
107#endif
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200108 struct rcu_head rcu_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109};
110
111#define GENHD_FL_REMOVABLE 1
112#define GENHD_FL_DRIVERFS 2
Kristen Carlson Accardi86ce18d2007-05-23 13:57:38 -0700113#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#define GENHD_FL_CD 8
115#define GENHD_FL_UP 16
116#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
Tejun Heo689d6fa2008-08-25 19:56:16 +0900117#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200118#define GENHD_FL_NATIVE_CAPACITY 128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Tejun Heo540eed52008-08-25 19:56:15 +0900120#define BLK_SCSI_MAX_CMDS (256)
121#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
122
123struct blk_scsi_cmd_filter {
124 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
125 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
126 struct kobject kobj;
127};
128
129struct disk_part_tbl {
130 struct rcu_head rcu_head;
131 int len;
Jens Axboea6f23652008-10-24 12:52:42 +0200132 struct hd_struct *last_lookup;
Tejun Heo540eed52008-08-25 19:56:15 +0900133 struct hd_struct *part[];
134};
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136struct gendisk {
Tejun Heo689d6fa2008-08-25 19:56:16 +0900137 /* major, first_minor and minors are input parameters only,
138 * don't use directly. Use disk_devt() and disk_max_parts().
Tejun Heof331c022008-09-03 09:01:48 +0200139 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 int major; /* major number of driver */
141 int first_minor;
142 int minors; /* maximum number of minors, =1 for
143 * disks that can't be partitioned. */
Tejun Heof331c022008-09-03 09:01:48 +0200144
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900145 char disk_name[DISK_NAME_LEN]; /* name of major driver */
Kay Sieverse454cea2009-09-18 23:01:12 +0200146 char *(*devnode)(struct gendisk *gd, mode_t *mode);
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200147 /* Array of pointers to partitions indexed by partno.
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200148 * Protected with matching bdev lock but stat and other
149 * non-critical accesses use RCU. Always access through
150 * helpers.
151 */
Tejun Heo540eed52008-08-25 19:56:15 +0900152 struct disk_part_tbl *part_tbl;
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200153 struct hd_struct part0;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200154
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700155 const struct block_device_operations *fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct request_queue *queue;
157 void *private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 int flags;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200160 struct device *driverfs_dev; // FIXME: remove
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800161 struct kobject *slave_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 struct timer_rand_state *random;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 atomic_t sync_io; /* RAID */
Kristen Carlson Accardi8ce7ad72007-05-23 13:57:38 -0700166 struct work_struct async_notify;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200167#ifdef CONFIG_BLK_DEV_INTEGRITY
168 struct blk_integrity *integrity;
169#endif
Tejun Heo540eed52008-08-25 19:56:15 +0900170 int node_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171};
172
Tejun Heo310a2c12008-08-25 19:47:17 +0900173static inline struct gendisk *part_to_disk(struct hd_struct *part)
174{
Tejun Heo548b10e2008-08-29 09:01:47 +0200175 if (likely(part)) {
176 if (part->partno)
177 return dev_to_disk(part_to_dev(part)->parent);
178 else
179 return dev_to_disk(part_to_dev(part));
180 }
Tejun Heo310a2c12008-08-25 19:47:17 +0900181 return NULL;
182}
183
Tejun Heof331c022008-09-03 09:01:48 +0200184static inline int disk_max_parts(struct gendisk *disk)
185{
Tejun Heo689d6fa2008-08-25 19:56:16 +0900186 if (disk->flags & GENHD_FL_EXT_DEVT)
187 return DISK_MAX_PARTS;
188 return disk->minors;
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200189}
190
191static inline bool disk_partitionable(struct gendisk *disk)
192{
193 return disk_max_parts(disk) > 1;
Tejun Heof331c022008-09-03 09:01:48 +0200194}
195
196static inline dev_t disk_devt(struct gendisk *disk)
197{
Tejun Heoed9e1982008-08-25 19:56:05 +0900198 return disk_to_dev(disk)->devt;
Tejun Heof331c022008-09-03 09:01:48 +0200199}
200
201static inline dev_t part_devt(struct hd_struct *part)
202{
Tejun Heoed9e1982008-08-25 19:56:05 +0900203 return part_to_dev(part)->devt;
Tejun Heof331c022008-09-03 09:01:48 +0200204}
205
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200206extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
207
208static inline void disk_put_part(struct hd_struct *part)
209{
210 if (likely(part))
Tejun Heoed9e1982008-08-25 19:56:05 +0900211 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200212}
213
214/*
215 * Smarter partition iterator without context limits.
216 */
217#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
218#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200219#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
Tejun Heo71982a42009-04-17 08:34:48 +0200220#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200221
222struct disk_part_iter {
223 struct gendisk *disk;
224 struct hd_struct *part;
225 int idx;
226 unsigned int flags;
227};
228
229extern void disk_part_iter_init(struct disk_part_iter *piter,
230 struct gendisk *disk, unsigned int flags);
231extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
232extern void disk_part_iter_exit(struct disk_part_iter *piter);
233
234extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
235 sector_t sector);
236
Tejun Heoc9959052008-08-25 19:47:21 +0900237/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 * Macros to operate on percpu disk statistics:
239 *
Tejun Heoc9959052008-08-25 19:47:21 +0900240 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
241 * and should be called between disk_stat_lock() and
242 * disk_stat_unlock().
243 *
244 * part_stat_read() can be called at any time.
245 *
246 * part_stat_{add|set_all}() and {init|free}_part_stats are for
247 * internal use only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 */
249#ifdef CONFIG_SMP
Tejun Heo074a7ac2008-08-25 19:56:14 +0900250#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
251#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
Tejun Heoc9959052008-08-25 19:47:21 +0900252
Tejun Heo074a7ac2008-08-25 19:56:14 +0900253#define __part_stat_add(cpu, part, field, addnd) \
254 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100255
256#define part_stat_read(part, field) \
257({ \
Tejun Heo074a7ac2008-08-25 19:56:14 +0900258 typeof((part)->dkstats->field) res = 0; \
Stephen Hemminger7af92f82010-01-06 15:45:55 -0800259 unsigned int _cpu; \
260 for_each_possible_cpu(_cpu) \
261 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100262 res; \
263})
264
Jens Axboe28f13702008-05-07 10:15:46 +0200265static inline void part_stat_set_all(struct hd_struct *part, int value)
266{
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100267 int i;
Jens Axboe28f13702008-05-07 10:15:46 +0200268
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100269 for_each_possible_cpu(i)
270 memset(per_cpu_ptr(part->dkstats, i), value,
Jens Axboe28f13702008-05-07 10:15:46 +0200271 sizeof(struct disk_stats));
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100272}
Tejun Heoc9959052008-08-25 19:47:21 +0900273
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100274static inline int init_part_stats(struct hd_struct *part)
275{
276 part->dkstats = alloc_percpu(struct disk_stats);
277 if (!part->dkstats)
278 return 0;
279 return 1;
280}
281
282static inline void free_part_stats(struct hd_struct *part)
283{
284 free_percpu(part->dkstats);
285}
286
Tejun Heo074a7ac2008-08-25 19:56:14 +0900287#else /* !CONFIG_SMP */
288#define part_stat_lock() ({ rcu_read_lock(); 0; })
289#define part_stat_unlock() rcu_read_unlock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Tejun Heo074a7ac2008-08-25 19:56:14 +0900291#define __part_stat_add(cpu, part, field, addnd) \
292 ((part)->dkstats.field += addnd)
293
294#define part_stat_read(part, field) ((part)->dkstats.field)
295
296static inline void part_stat_set_all(struct hd_struct *part, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Tejun Heo074a7ac2008-08-25 19:56:14 +0900298 memset(&part->dkstats, value, sizeof(struct disk_stats));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100300
301static inline int init_part_stats(struct hd_struct *part)
302{
303 return 1;
304}
305
306static inline void free_part_stats(struct hd_struct *part)
307{
308}
Tejun Heo074a7ac2008-08-25 19:56:14 +0900309
310#endif /* CONFIG_SMP */
311
312#define part_stat_add(cpu, part, field, addnd) do { \
313 __part_stat_add((cpu), (part), field, addnd); \
314 if ((part)->partno) \
315 __part_stat_add((cpu), &part_to_disk((part))->part0, \
316 field, addnd); \
317} while (0)
318
319#define part_stat_dec(cpu, gendiskp, field) \
320 part_stat_add(cpu, gendiskp, field, -1)
321#define part_stat_inc(cpu, gendiskp, field) \
322 part_stat_add(cpu, gendiskp, field, 1)
323#define part_stat_sub(cpu, gendiskp, field, subnd) \
324 part_stat_add(cpu, gendiskp, field, -subnd)
325
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200326static inline void part_inc_in_flight(struct hd_struct *part, int rw)
Tejun Heo074a7ac2008-08-25 19:56:14 +0900327{
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200328 part->in_flight[rw]++;
Tejun Heo074a7ac2008-08-25 19:56:14 +0900329 if (part->partno)
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200330 part_to_disk(part)->part0.in_flight[rw]++;
Tejun Heo074a7ac2008-08-25 19:56:14 +0900331}
332
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200333static inline void part_dec_in_flight(struct hd_struct *part, int rw)
Tejun Heo074a7ac2008-08-25 19:56:14 +0900334{
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200335 part->in_flight[rw]--;
Tejun Heo074a7ac2008-08-25 19:56:14 +0900336 if (part->partno)
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200337 part_to_disk(part)->part0.in_flight[rw]--;
338}
339
340static inline int part_in_flight(struct hd_struct *part)
341{
342 return part->in_flight[0] + part->in_flight[1];
Tejun Heo074a7ac2008-08-25 19:56:14 +0900343}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Petros Koutoupisd3992282009-03-11 10:49:35 +0100345/* block/blk-core.c */
Tejun Heoc9959052008-08-25 19:47:21 +0900346extern void part_round_stats(int cpu, struct hd_struct *part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Petros Koutoupis32ca1632009-03-10 08:25:54 +0100348/* block/genhd.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349extern void add_disk(struct gendisk *disk);
350extern void del_gendisk(struct gendisk *gp);
351extern void unlink_gendisk(struct gendisk *gp);
Tejun Heocf771cb2008-09-03 09:01:09 +0200352extern struct gendisk *get_gendisk(dev_t dev, int *partno);
Tejun Heof331c022008-09-03 09:01:48 +0200353extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355extern void set_device_ro(struct block_device *bdev, int flag);
356extern void set_disk_ro(struct gendisk *disk, int flag);
357
Tejun Heob7db9952008-08-25 19:56:10 +0900358static inline int get_disk_ro(struct gendisk *disk)
359{
360 return disk->part0.policy;
361}
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363/* drivers/char/random.c */
364extern void add_disk_randomness(struct gendisk *disk);
365extern void rand_initialize_disk(struct gendisk *disk);
366
367static inline sector_t get_start_sect(struct block_device *bdev)
368{
Tejun Heo0762b8b2008-08-25 19:56:12 +0900369 return bdev->bd_part->start_sect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371static inline sector_t get_capacity(struct gendisk *disk)
372{
Tejun Heo80795ae2008-08-25 19:56:07 +0900373 return disk->part0.nr_sects;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
375static inline void set_capacity(struct gendisk *disk, sector_t size)
376{
Tejun Heo80795ae2008-08-25 19:56:07 +0900377 disk->part0.nr_sects = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380#ifdef CONFIG_SOLARIS_X86_PARTITION
381
Mark Fortescueb84d8792007-07-25 18:30:08 -0700382#define SOLARIS_X86_NUMSLICE 16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
384
385struct solaris_x86_slice {
386 __le16 s_tag; /* ID tag of partition */
387 __le16 s_flag; /* permission flags */
388 __le32 s_start; /* start sector no of partition */
389 __le32 s_size; /* # of blocks in partition */
390};
391
392struct solaris_x86_vtoc {
393 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
394 __le32 v_sanity; /* to verify vtoc sanity */
395 __le32 v_version; /* layout version */
396 char v_volume[8]; /* volume name */
397 __le16 v_sectorsz; /* sector size in bytes */
398 __le16 v_nparts; /* number of partitions */
399 unsigned int v_reserved[10]; /* free space */
400 struct solaris_x86_slice
401 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
402 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
403 char v_asciilabel[128]; /* for compatibility */
404};
405
406#endif /* CONFIG_SOLARIS_X86_PARTITION */
407
408#ifdef CONFIG_BSD_DISKLABEL
409/*
410 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
411 * updated by Marc Espie <Marc.Espie@openbsd.org>
412 */
413
414/* check against BSD src/sys/sys/disklabel.h for consistency */
415
416#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
417#define BSD_MAXPARTITIONS 16
418#define OPENBSD_MAXPARTITIONS 16
419#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
420struct bsd_disklabel {
421 __le32 d_magic; /* the magic number */
422 __s16 d_type; /* drive type */
423 __s16 d_subtype; /* controller/d_type specific */
424 char d_typename[16]; /* type name, e.g. "eagle" */
425 char d_packname[16]; /* pack identifier */
426 __u32 d_secsize; /* # of bytes per sector */
427 __u32 d_nsectors; /* # of data sectors per track */
428 __u32 d_ntracks; /* # of tracks per cylinder */
429 __u32 d_ncylinders; /* # of data cylinders per unit */
430 __u32 d_secpercyl; /* # of data sectors per cylinder */
431 __u32 d_secperunit; /* # of data sectors per unit */
432 __u16 d_sparespertrack; /* # of spare sectors per track */
433 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
434 __u32 d_acylinders; /* # of alt. cylinders per unit */
435 __u16 d_rpm; /* rotational speed */
436 __u16 d_interleave; /* hardware sector interleave */
437 __u16 d_trackskew; /* sector 0 skew, per track */
438 __u16 d_cylskew; /* sector 0 skew, per cylinder */
439 __u32 d_headswitch; /* head switch time, usec */
440 __u32 d_trkseek; /* track-to-track seek, usec */
441 __u32 d_flags; /* generic flags */
442#define NDDATA 5
443 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
444#define NSPARE 5
445 __u32 d_spare[NSPARE]; /* reserved for future use */
446 __le32 d_magic2; /* the magic number (again) */
447 __le16 d_checksum; /* xor of data incl. partitions */
448
449 /* filesystem and partition information: */
450 __le16 d_npartitions; /* number of partitions in following */
451 __le32 d_bbsize; /* size of boot area at sn0, bytes */
452 __le32 d_sbsize; /* max size of fs superblock, bytes */
453 struct bsd_partition { /* the partition table */
454 __le32 p_size; /* number of sectors in partition */
455 __le32 p_offset; /* starting sector */
456 __le32 p_fsize; /* filesystem basic fragment size */
457 __u8 p_fstype; /* filesystem type, see below */
458 __u8 p_frag; /* filesystem fragments per block */
459 __le16 p_cpg; /* filesystem cylinders per group */
460 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
461};
462
463#endif /* CONFIG_BSD_DISKLABEL */
464
465#ifdef CONFIG_UNIXWARE_DISKLABEL
466/*
467 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
468 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
469 */
470
471#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
472#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
473#define UNIXWARE_NUMSLICE 16
474#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
475
476struct unixware_slice {
477 __le16 s_label; /* label */
478 __le16 s_flags; /* permission flags */
479 __le32 start_sect; /* starting sector */
480 __le32 nr_sects; /* number of sectors in slice */
481};
482
483struct unixware_disklabel {
484 __le32 d_type; /* drive type */
485 __le32 d_magic; /* the magic number */
486 __le32 d_version; /* version number */
487 char d_serial[12]; /* serial number of the device */
488 __le32 d_ncylinders; /* # of data cylinders per device */
489 __le32 d_ntracks; /* # of tracks per cylinder */
490 __le32 d_nsectors; /* # of data sectors per track */
491 __le32 d_secsize; /* # of bytes per sector */
492 __le32 d_part_start; /* # of first sector of this partition */
493 __le32 d_unknown1[12]; /* ? */
494 __le32 d_alt_tbl; /* byte offset of alternate table */
495 __le32 d_alt_len; /* byte length of alternate table */
496 __le32 d_phys_cyl; /* # of physical cylinders per device */
497 __le32 d_phys_trk; /* # of physical tracks per cylinder */
498 __le32 d_phys_sec; /* # of physical sectors per track */
499 __le32 d_phys_bytes; /* # of physical bytes per sector */
500 __le32 d_unknown2; /* ? */
501 __le32 d_unknown3; /* ? */
502 __le32 d_pad[8]; /* pad */
503
504 struct unixware_vtoc {
505 __le32 v_magic; /* the magic number */
506 __le32 v_version; /* version number */
507 char v_name[8]; /* volume name */
508 __le16 v_nslices; /* # of slices */
509 __le16 v_unknown1; /* ? */
510 __le32 v_reserved[10]; /* reserved */
511 struct unixware_slice
512 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
513 } vtoc;
514
515}; /* 408 */
516
517#endif /* CONFIG_UNIXWARE_DISKLABEL */
518
519#ifdef CONFIG_MINIX_SUBPARTITION
520# define MINIX_NR_SUBPARTITIONS 4
521#endif /* CONFIG_MINIX_SUBPARTITION */
522
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800523#define ADDPART_FLAG_NONE 0
524#define ADDPART_FLAG_RAID 1
525#define ADDPART_FLAG_WHOLEDISK 2
526
Tejun Heobcce3de2008-08-25 19:47:22 +0900527extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
528extern void blk_free_devt(dev_t devt);
Tejun Heocf771cb2008-09-03 09:01:09 +0200529extern dev_t blk_lookup_devt(const char *name, int partno);
530extern char *disk_name (struct gendisk *hd, int partno, char *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Tejun Heo540eed52008-08-25 19:56:15 +0900532extern int disk_expand_part_tbl(struct gendisk *disk, int target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
Tejun Heoba329292008-11-10 15:29:58 +0900534extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
535 int partno, sector_t start,
536 sector_t len, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537extern void delete_partition(struct gendisk *, int);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700538extern void printk_all_partitions(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
Christoph Lameter19460892005-06-23 00:08:19 -0700540extern struct gendisk *alloc_disk_node(int minors, int node_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541extern struct gendisk *alloc_disk(int minors);
542extern struct kobject *get_disk(struct gendisk *disk);
543extern void put_disk(struct gendisk *disk);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200544extern void blk_register_region(dev_t devt, unsigned long range,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 struct module *module,
546 struct kobject *(*probe)(dev_t, int *, void *),
547 int (*lock)(dev_t, void *),
548 void *data);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200549extern void blk_unregister_region(dev_t devt, unsigned long range);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Tejun Heoe5610522008-08-25 19:56:09 +0900551extern ssize_t part_size_show(struct device *dev,
552 struct device_attribute *attr, char *buf);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900553extern ssize_t part_stat_show(struct device *dev,
554 struct device_attribute *attr, char *buf);
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200555extern ssize_t part_inflight_show(struct device *dev,
556 struct device_attribute *attr, char *buf);
Tejun Heoeddb2e22008-08-25 19:56:13 +0900557#ifdef CONFIG_FAIL_MAKE_REQUEST
558extern ssize_t part_fail_show(struct device *dev,
559 struct device_attribute *attr, char *buf);
560extern ssize_t part_fail_store(struct device *dev,
561 struct device_attribute *attr,
562 const char *buf, size_t count);
563#endif /* CONFIG_FAIL_MAKE_REQUEST */
Tejun Heoe5610522008-08-25 19:56:09 +0900564
Jens Axboe87c1efb2007-05-11 13:29:54 +0200565#else /* CONFIG_BLOCK */
566
567static inline void printk_all_partitions(void) { }
568
Tejun Heocf771cb2008-09-03 09:01:09 +0200569static inline dev_t blk_lookup_devt(const char *name, int partno)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200570{
571 dev_t devt = MKDEV(0, 0);
572 return devt;
573}
574
Jens Axboe87c1efb2007-05-11 13:29:54 +0200575#endif /* CONFIG_BLOCK */
David Howells93614012006-09-30 20:45:40 +0200576
David Woodhousea8ae50b2008-03-12 17:52:56 +0100577#endif /* _LINUX_GENHD_H */