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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;
Tejun Heoed9e1982008-08-25 19:56:05 +090093 struct device __dev;
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -080094 struct kobject *holder_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 int policy, partno;
Akinobu Mitac17bb492006-12-08 02:39:46 -080096#ifdef CONFIG_FAIL_MAKE_REQUEST
97 int make_it_fail;
98#endif
Jerome Marchandea5c48a2008-02-08 11:04:09 +010099 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
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200106 struct rcu_head rcu_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107};
108
109#define GENHD_FL_REMOVABLE 1
110#define GENHD_FL_DRIVERFS 2
Kristen Carlson Accardi86ce18d2007-05-23 13:57:38 -0700111#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112#define GENHD_FL_CD 8
113#define GENHD_FL_UP 16
114#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
Tejun Heo689d6fa2008-08-25 19:56:16 +0900115#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Tejun Heo540eed52008-08-25 19:56:15 +0900117#define BLK_SCSI_MAX_CMDS (256)
118#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
119
120struct 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
126struct disk_part_tbl {
127 struct rcu_head rcu_head;
128 int len;
Jens Axboea6f23652008-10-24 12:52:42 +0200129 struct hd_struct *last_lookup;
Tejun Heo540eed52008-08-25 19:56:15 +0900130 struct hd_struct *part[];
131};
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133struct gendisk {
Tejun Heo689d6fa2008-08-25 19:56:16 +0900134 /* major, first_minor and minors are input parameters only,
135 * don't use directly. Use disk_devt() and disk_max_parts().
Tejun Heof331c022008-09-03 09:01:48 +0200136 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 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. */
Tejun Heof331c022008-09-03 09:01:48 +0200141
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900142 char disk_name[DISK_NAME_LEN]; /* name of major driver */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200143
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200144 /* Array of pointers to partitions indexed by partno.
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200145 * Protected with matching bdev lock but stat and other
146 * non-critical accesses use RCU. Always access through
147 * helpers.
148 */
Tejun Heo540eed52008-08-25 19:56:15 +0900149 struct disk_part_tbl *part_tbl;
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200150 struct hd_struct part0;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 struct block_device_operations *fops;
153 struct request_queue *queue;
154 void *private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 int flags;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200157 struct device *driverfs_dev; // FIXME: remove
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800158 struct kobject *slave_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 struct timer_rand_state *random;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 atomic_t sync_io; /* RAID */
Kristen Carlson Accardi8ce7ad72007-05-23 13:57:38 -0700163 struct work_struct async_notify;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200164#ifdef CONFIG_BLK_DEV_INTEGRITY
165 struct blk_integrity *integrity;
166#endif
Tejun Heo540eed52008-08-25 19:56:15 +0900167 int node_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168};
169
Tejun Heo310a2c12008-08-25 19:47:17 +0900170static inline struct gendisk *part_to_disk(struct hd_struct *part)
171{
Tejun Heo548b10e2008-08-29 09:01:47 +0200172 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 }
Tejun Heo310a2c12008-08-25 19:47:17 +0900178 return NULL;
179}
180
Tejun Heof331c022008-09-03 09:01:48 +0200181static inline int disk_max_parts(struct gendisk *disk)
182{
Tejun Heo689d6fa2008-08-25 19:56:16 +0900183 if (disk->flags & GENHD_FL_EXT_DEVT)
184 return DISK_MAX_PARTS;
185 return disk->minors;
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200186}
187
188static inline bool disk_partitionable(struct gendisk *disk)
189{
190 return disk_max_parts(disk) > 1;
Tejun Heof331c022008-09-03 09:01:48 +0200191}
192
193static inline dev_t disk_devt(struct gendisk *disk)
194{
Tejun Heoed9e1982008-08-25 19:56:05 +0900195 return disk_to_dev(disk)->devt;
Tejun Heof331c022008-09-03 09:01:48 +0200196}
197
198static inline dev_t part_devt(struct hd_struct *part)
199{
Tejun Heoed9e1982008-08-25 19:56:05 +0900200 return part_to_dev(part)->devt;
Tejun Heof331c022008-09-03 09:01:48 +0200201}
202
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200203extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
204
205static inline void disk_put_part(struct hd_struct *part)
206{
207 if (likely(part))
Tejun Heoed9e1982008-08-25 19:56:05 +0900208 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200209}
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 */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200216#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200217
218struct disk_part_iter {
219 struct gendisk *disk;
220 struct hd_struct *part;
221 int idx;
222 unsigned int flags;
223};
224
225extern void disk_part_iter_init(struct disk_part_iter *piter,
226 struct gendisk *disk, unsigned int flags);
227extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
228extern void disk_part_iter_exit(struct disk_part_iter *piter);
229
230extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
231 sector_t sector);
232
Tejun Heoc9959052008-08-25 19:47:21 +0900233/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 * Macros to operate on percpu disk statistics:
235 *
Tejun Heoc9959052008-08-25 19:47:21 +0900236 * {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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 */
245#ifdef CONFIG_SMP
Tejun Heo074a7ac2008-08-25 19:56:14 +0900246#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
247#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
Tejun Heoc9959052008-08-25 19:47:21 +0900248
Tejun Heo074a7ac2008-08-25 19:56:14 +0900249#define __part_stat_add(cpu, part, field, addnd) \
250 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100251
252#define part_stat_read(part, field) \
253({ \
Tejun Heo074a7ac2008-08-25 19:56:14 +0900254 typeof((part)->dkstats->field) res = 0; \
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100255 int i; \
256 for_each_possible_cpu(i) \
Tejun Heo074a7ac2008-08-25 19:56:14 +0900257 res += per_cpu_ptr((part)->dkstats, i)->field; \
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100258 res; \
259})
260
Jens Axboe28f13702008-05-07 10:15:46 +0200261static inline void part_stat_set_all(struct hd_struct *part, int value)
262{
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100263 int i;
Jens Axboe28f13702008-05-07 10:15:46 +0200264
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100265 for_each_possible_cpu(i)
266 memset(per_cpu_ptr(part->dkstats, i), value,
Jens Axboe28f13702008-05-07 10:15:46 +0200267 sizeof(struct disk_stats));
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100268}
Tejun Heoc9959052008-08-25 19:47:21 +0900269
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100270static 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
278static inline void free_part_stats(struct hd_struct *part)
279{
280 free_percpu(part->dkstats);
281}
282
Tejun Heo074a7ac2008-08-25 19:56:14 +0900283#else /* !CONFIG_SMP */
284#define part_stat_lock() ({ rcu_read_lock(); 0; })
285#define part_stat_unlock() rcu_read_unlock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Tejun Heo074a7ac2008-08-25 19:56:14 +0900287#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
292static inline void part_stat_set_all(struct hd_struct *part, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
Tejun Heo074a7ac2008-08-25 19:56:14 +0900294 memset(&part->dkstats, value, sizeof(struct disk_stats));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100296
297static inline int init_part_stats(struct hd_struct *part)
298{
299 return 1;
300}
301
302static inline void free_part_stats(struct hd_struct *part)
303{
304}
Tejun Heo074a7ac2008-08-25 19:56:14 +0900305
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
322static 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
329static 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Petros Koutoupisd3992282009-03-11 10:49:35 +0100336/* block/blk-core.c */
Tejun Heoc9959052008-08-25 19:47:21 +0900337extern void part_round_stats(int cpu, struct hd_struct *part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Petros Koutoupis32ca1632009-03-10 08:25:54 +0100339/* block/genhd.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340extern void add_disk(struct gendisk *disk);
341extern void del_gendisk(struct gendisk *gp);
342extern void unlink_gendisk(struct gendisk *gp);
Tejun Heocf771cb2008-09-03 09:01:09 +0200343extern struct gendisk *get_gendisk(dev_t dev, int *partno);
Tejun Heof331c022008-09-03 09:01:48 +0200344extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346extern void set_device_ro(struct block_device *bdev, int flag);
347extern void set_disk_ro(struct gendisk *disk, int flag);
348
Tejun Heob7db9952008-08-25 19:56:10 +0900349static inline int get_disk_ro(struct gendisk *disk)
350{
351 return disk->part0.policy;
352}
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354/* drivers/char/random.c */
355extern void add_disk_randomness(struct gendisk *disk);
356extern void rand_initialize_disk(struct gendisk *disk);
357
358static inline sector_t get_start_sect(struct block_device *bdev)
359{
Tejun Heo0762b8b2008-08-25 19:56:12 +0900360 return bdev->bd_part->start_sect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361}
362static inline sector_t get_capacity(struct gendisk *disk)
363{
Tejun Heo80795ae2008-08-25 19:56:07 +0900364 return disk->part0.nr_sects;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366static inline void set_capacity(struct gendisk *disk, sector_t size)
367{
Tejun Heo80795ae2008-08-25 19:56:07 +0900368 disk->part0.nr_sects = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369}
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371#ifdef CONFIG_SOLARIS_X86_PARTITION
372
Mark Fortescueb84d8792007-07-25 18:30:08 -0700373#define SOLARIS_X86_NUMSLICE 16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
375
376struct solaris_x86_slice {
377 __le16 s_tag; /* ID tag of partition */
378 __le16 s_flag; /* permission flags */
379 __le32 s_start; /* start sector no of partition */
380 __le32 s_size; /* # of blocks in partition */
381};
382
383struct solaris_x86_vtoc {
384 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
385 __le32 v_sanity; /* to verify vtoc sanity */
386 __le32 v_version; /* layout version */
387 char v_volume[8]; /* volume name */
388 __le16 v_sectorsz; /* sector size in bytes */
389 __le16 v_nparts; /* number of partitions */
390 unsigned int v_reserved[10]; /* free space */
391 struct solaris_x86_slice
392 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
393 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
394 char v_asciilabel[128]; /* for compatibility */
395};
396
397#endif /* CONFIG_SOLARIS_X86_PARTITION */
398
399#ifdef CONFIG_BSD_DISKLABEL
400/*
401 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
402 * updated by Marc Espie <Marc.Espie@openbsd.org>
403 */
404
405/* check against BSD src/sys/sys/disklabel.h for consistency */
406
407#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
408#define BSD_MAXPARTITIONS 16
409#define OPENBSD_MAXPARTITIONS 16
410#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
411struct bsd_disklabel {
412 __le32 d_magic; /* the magic number */
413 __s16 d_type; /* drive type */
414 __s16 d_subtype; /* controller/d_type specific */
415 char d_typename[16]; /* type name, e.g. "eagle" */
416 char d_packname[16]; /* pack identifier */
417 __u32 d_secsize; /* # of bytes per sector */
418 __u32 d_nsectors; /* # of data sectors per track */
419 __u32 d_ntracks; /* # of tracks per cylinder */
420 __u32 d_ncylinders; /* # of data cylinders per unit */
421 __u32 d_secpercyl; /* # of data sectors per cylinder */
422 __u32 d_secperunit; /* # of data sectors per unit */
423 __u16 d_sparespertrack; /* # of spare sectors per track */
424 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
425 __u32 d_acylinders; /* # of alt. cylinders per unit */
426 __u16 d_rpm; /* rotational speed */
427 __u16 d_interleave; /* hardware sector interleave */
428 __u16 d_trackskew; /* sector 0 skew, per track */
429 __u16 d_cylskew; /* sector 0 skew, per cylinder */
430 __u32 d_headswitch; /* head switch time, usec */
431 __u32 d_trkseek; /* track-to-track seek, usec */
432 __u32 d_flags; /* generic flags */
433#define NDDATA 5
434 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
435#define NSPARE 5
436 __u32 d_spare[NSPARE]; /* reserved for future use */
437 __le32 d_magic2; /* the magic number (again) */
438 __le16 d_checksum; /* xor of data incl. partitions */
439
440 /* filesystem and partition information: */
441 __le16 d_npartitions; /* number of partitions in following */
442 __le32 d_bbsize; /* size of boot area at sn0, bytes */
443 __le32 d_sbsize; /* max size of fs superblock, bytes */
444 struct bsd_partition { /* the partition table */
445 __le32 p_size; /* number of sectors in partition */
446 __le32 p_offset; /* starting sector */
447 __le32 p_fsize; /* filesystem basic fragment size */
448 __u8 p_fstype; /* filesystem type, see below */
449 __u8 p_frag; /* filesystem fragments per block */
450 __le16 p_cpg; /* filesystem cylinders per group */
451 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
452};
453
454#endif /* CONFIG_BSD_DISKLABEL */
455
456#ifdef CONFIG_UNIXWARE_DISKLABEL
457/*
458 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
459 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
460 */
461
462#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
463#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
464#define UNIXWARE_NUMSLICE 16
465#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
466
467struct unixware_slice {
468 __le16 s_label; /* label */
469 __le16 s_flags; /* permission flags */
470 __le32 start_sect; /* starting sector */
471 __le32 nr_sects; /* number of sectors in slice */
472};
473
474struct unixware_disklabel {
475 __le32 d_type; /* drive type */
476 __le32 d_magic; /* the magic number */
477 __le32 d_version; /* version number */
478 char d_serial[12]; /* serial number of the device */
479 __le32 d_ncylinders; /* # of data cylinders per device */
480 __le32 d_ntracks; /* # of tracks per cylinder */
481 __le32 d_nsectors; /* # of data sectors per track */
482 __le32 d_secsize; /* # of bytes per sector */
483 __le32 d_part_start; /* # of first sector of this partition */
484 __le32 d_unknown1[12]; /* ? */
485 __le32 d_alt_tbl; /* byte offset of alternate table */
486 __le32 d_alt_len; /* byte length of alternate table */
487 __le32 d_phys_cyl; /* # of physical cylinders per device */
488 __le32 d_phys_trk; /* # of physical tracks per cylinder */
489 __le32 d_phys_sec; /* # of physical sectors per track */
490 __le32 d_phys_bytes; /* # of physical bytes per sector */
491 __le32 d_unknown2; /* ? */
492 __le32 d_unknown3; /* ? */
493 __le32 d_pad[8]; /* pad */
494
495 struct unixware_vtoc {
496 __le32 v_magic; /* the magic number */
497 __le32 v_version; /* version number */
498 char v_name[8]; /* volume name */
499 __le16 v_nslices; /* # of slices */
500 __le16 v_unknown1; /* ? */
501 __le32 v_reserved[10]; /* reserved */
502 struct unixware_slice
503 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
504 } vtoc;
505
506}; /* 408 */
507
508#endif /* CONFIG_UNIXWARE_DISKLABEL */
509
510#ifdef CONFIG_MINIX_SUBPARTITION
511# define MINIX_NR_SUBPARTITIONS 4
512#endif /* CONFIG_MINIX_SUBPARTITION */
513
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800514#define ADDPART_FLAG_NONE 0
515#define ADDPART_FLAG_RAID 1
516#define ADDPART_FLAG_WHOLEDISK 2
517
Tejun Heobcce3de2008-08-25 19:47:22 +0900518extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
519extern void blk_free_devt(dev_t devt);
Tejun Heocf771cb2008-09-03 09:01:09 +0200520extern dev_t blk_lookup_devt(const char *name, int partno);
521extern char *disk_name (struct gendisk *hd, int partno, char *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Tejun Heo540eed52008-08-25 19:56:15 +0900523extern int disk_expand_part_tbl(struct gendisk *disk, int target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
Tejun Heoba329292008-11-10 15:29:58 +0900525extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
526 int partno, sector_t start,
527 sector_t len, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528extern void delete_partition(struct gendisk *, int);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700529extern void printk_all_partitions(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
Christoph Lameter19460892005-06-23 00:08:19 -0700531extern struct gendisk *alloc_disk_node(int minors, int node_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532extern struct gendisk *alloc_disk(int minors);
533extern struct kobject *get_disk(struct gendisk *disk);
534extern void put_disk(struct gendisk *disk);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200535extern void blk_register_region(dev_t devt, unsigned long range,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 struct module *module,
537 struct kobject *(*probe)(dev_t, int *, void *),
538 int (*lock)(dev_t, void *),
539 void *data);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200540extern void blk_unregister_region(dev_t devt, unsigned long range);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
Tejun Heoe5610522008-08-25 19:56:09 +0900542extern ssize_t part_size_show(struct device *dev,
543 struct device_attribute *attr, char *buf);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900544extern ssize_t part_stat_show(struct device *dev,
545 struct device_attribute *attr, char *buf);
Tejun Heoeddb2e22008-08-25 19:56:13 +0900546#ifdef CONFIG_FAIL_MAKE_REQUEST
547extern ssize_t part_fail_show(struct device *dev,
548 struct device_attribute *attr, char *buf);
549extern ssize_t part_fail_store(struct device *dev,
550 struct device_attribute *attr,
551 const char *buf, size_t count);
552#endif /* CONFIG_FAIL_MAKE_REQUEST */
Tejun Heoe5610522008-08-25 19:56:09 +0900553
Jens Axboe87c1efb2007-05-11 13:29:54 +0200554#else /* CONFIG_BLOCK */
555
556static inline void printk_all_partitions(void) { }
557
Tejun Heocf771cb2008-09-03 09:01:09 +0200558static inline dev_t blk_lookup_devt(const char *name, int partno)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200559{
560 dev_t devt = MKDEV(0, 0);
561 return devt;
562}
563
Jens Axboe87c1efb2007-05-11 13:29:54 +0200564#endif /* CONFIG_BLOCK */
David Howells93614012006-09-30 20:45:40 +0200565
David Woodhousea8ae50b2008-03-12 17:52:56 +0100566#endif /* _LINUX_GENHD_H */