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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>
Will Drewry6d1d8052010-08-31 15:47:05 -050015#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
David Howells93614012006-09-30 20:45:40 +020017#ifdef CONFIG_BLOCK
18
Tejun Heoed9e1982008-08-25 19:56:05 +090019#define kobj_to_dev(k) container_of((k), struct device, kobj)
Tejun Heo548b10e2008-08-29 09:01:47 +020020#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
Tejun Heoed9e1982008-08-25 19:56:05 +090021#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
Tejun Heo548b10e2008-08-29 09:01:47 +020022#define disk_to_dev(disk) (&(disk)->part0.__dev)
Tejun Heoed9e1982008-08-25 19:56:05 +090023#define part_to_dev(part) (&((part)->__dev))
Kay Sieversedfaa7c2007-05-21 22:08:01 +020024
Kay Sieversedfaa7c2007-05-21 22:08:01 +020025extern struct device_type part_type;
26extern struct kobject *block_depr;
27extern struct class block_class;
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029enum {
30/* These three have identical behaviour; use the second one if DOS FDISK gets
31 confused about extended/logical partitions starting past cylinder 1023. */
32 DOS_EXTENDED_PARTITION = 5,
33 LINUX_EXTENDED_PARTITION = 0x85,
34 WIN98_EXTENDED_PARTITION = 0x0f,
35
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -080036 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 LINUX_SWAP_PARTITION = 0x82,
Olaf Hering4419d1a2007-02-10 01:45:47 -080039 LINUX_DATA_PARTITION = 0x83,
40 LINUX_LVM_PARTITION = 0x8e,
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
42
43 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
44 NEW_SOLARIS_X86_PARTITION = 0xbf,
45
46 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
47 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
48 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
49 EZD_PARTITION = 0x55, /* EZ-DRIVE */
50
51 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
52 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
53 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
54 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
55 MINIX_PARTITION = 0x81, /* Minix Partition ID */
56 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
57};
58
Tejun Heo689d6fa2008-08-25 19:56:16 +090059#define DISK_MAX_PARTS 256
Tejun Heo3e1a7ff2008-08-25 19:56:17 +090060#define DISK_NAME_LEN 32
Tejun Heo689d6fa2008-08-25 19:56:16 +090061
David Woodhouse34186ef2006-04-25 14:07:57 +010062#include <linux/major.h>
63#include <linux/device.h>
64#include <linux/smp.h>
65#include <linux/string.h>
66#include <linux/fs.h>
Kristen Carlson Accardi8ce7ad72007-05-23 13:57:38 -070067#include <linux/workqueue.h>
David Woodhouse34186ef2006-04-25 14:07:57 +010068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069struct partition {
70 unsigned char boot_ind; /* 0x80 - active */
71 unsigned char head; /* starting head */
72 unsigned char sector; /* starting sector */
73 unsigned char cyl; /* starting cylinder */
74 unsigned char sys_ind; /* What partition type */
75 unsigned char end_head; /* end head */
76 unsigned char end_sector; /* end sector */
77 unsigned char end_cyl; /* end cylinder */
78 __le32 start_sect; /* starting sector counting from 0 */
79 __le32 nr_sects; /* nr of sectors in partition */
80} __attribute__((packed));
81
Jerome Marchandea5c48a2008-02-08 11:04:09 +010082struct disk_stats {
83 unsigned long sectors[2]; /* READs and WRITEs */
84 unsigned long ios[2];
85 unsigned long merges[2];
86 unsigned long ticks[2];
87 unsigned long io_ticks;
88 unsigned long time_in_queue;
89};
Will Drewry6d1d8052010-08-31 15:47:05 -050090
91#define PARTITION_META_INFO_VOLNAMELTH 64
92#define PARTITION_META_INFO_UUIDLTH 16
93
94struct partition_meta_info {
95 u8 uuid[PARTITION_META_INFO_UUIDLTH]; /* always big endian */
96 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
97};
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099struct hd_struct {
100 sector_t start_sect;
101 sector_t nr_sects;
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400102 sector_t alignment_offset;
Martin K. Petersen86b37282009-11-10 11:50:21 +0100103 unsigned int discard_alignment;
Tejun Heoed9e1982008-08-25 19:56:05 +0900104 struct device __dev;
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800105 struct kobject *holder_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 int policy, partno;
Will Drewry6d1d8052010-08-31 15:47:05 -0500107 struct partition_meta_info *info;
Akinobu Mitac17bb492006-12-08 02:39:46 -0800108#ifdef CONFIG_FAIL_MAKE_REQUEST
109 int make_it_fail;
110#endif
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100111 unsigned long stamp;
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200112 int in_flight[2];
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100113#ifdef CONFIG_SMP
Tejun Heo43cf38e2010-02-02 14:38:57 +0900114 struct disk_stats __percpu *dkstats;
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100115#else
116 struct disk_stats dkstats;
117#endif
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200118 struct rcu_head rcu_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
121#define GENHD_FL_REMOVABLE 1
NeilBrown97fedbb2010-03-16 08:55:32 +0100122/* 2 is unused */
Kristen Carlson Accardi86ce18d2007-05-23 13:57:38 -0700123#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#define GENHD_FL_CD 8
125#define GENHD_FL_UP 16
126#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
Tejun Heo689d6fa2008-08-25 19:56:16 +0900127#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
Bartlomiej Zolnierkiewiczdb429e92009-06-07 13:52:52 +0200128#define GENHD_FL_NATIVE_CAPACITY 128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Tejun Heo540eed52008-08-25 19:56:15 +0900130#define BLK_SCSI_MAX_CMDS (256)
131#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
132
133struct blk_scsi_cmd_filter {
134 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
135 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
136 struct kobject kobj;
137};
138
139struct disk_part_tbl {
140 struct rcu_head rcu_head;
141 int len;
Arnd Bergmann4d2deb42010-02-24 20:01:56 +0100142 struct hd_struct __rcu *last_lookup;
Yasuaki Ishimatsu7681bfe2010-10-19 09:05:00 +0200143 struct gendisk *disk;
Arnd Bergmann4d2deb42010-02-24 20:01:56 +0100144 struct hd_struct __rcu *part[];
Tejun Heo540eed52008-08-25 19:56:15 +0900145};
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147struct gendisk {
Tejun Heo689d6fa2008-08-25 19:56:16 +0900148 /* major, first_minor and minors are input parameters only,
149 * don't use directly. Use disk_devt() and disk_max_parts().
Tejun Heof331c022008-09-03 09:01:48 +0200150 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 int major; /* major number of driver */
152 int first_minor;
153 int minors; /* maximum number of minors, =1 for
154 * disks that can't be partitioned. */
Tejun Heof331c022008-09-03 09:01:48 +0200155
Tejun Heo3e1a7ff2008-08-25 19:56:17 +0900156 char disk_name[DISK_NAME_LEN]; /* name of major driver */
Kay Sieverse454cea2009-09-18 23:01:12 +0200157 char *(*devnode)(struct gendisk *gd, mode_t *mode);
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200158 /* Array of pointers to partitions indexed by partno.
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200159 * Protected with matching bdev lock but stat and other
160 * non-critical accesses use RCU. Always access through
161 * helpers.
162 */
Arnd Bergmann4d2deb42010-02-24 20:01:56 +0100163 struct disk_part_tbl __rcu *part_tbl;
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200164 struct hd_struct part0;
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200165
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700166 const struct block_device_operations *fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 struct request_queue *queue;
168 void *private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 int flags;
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200171 struct device *driverfs_dev; // FIXME: remove
Jun'ichi Nomura6a4d44c2006-03-27 01:17:55 -0800172 struct kobject *slave_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 struct timer_rand_state *random;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 atomic_t sync_io; /* RAID */
Kristen Carlson Accardi8ce7ad72007-05-23 13:57:38 -0700177 struct work_struct async_notify;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200178#ifdef CONFIG_BLK_DEV_INTEGRITY
179 struct blk_integrity *integrity;
180#endif
Tejun Heo540eed52008-08-25 19:56:15 +0900181 int node_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182};
183
Tejun Heo310a2c12008-08-25 19:47:17 +0900184static inline struct gendisk *part_to_disk(struct hd_struct *part)
185{
Tejun Heo548b10e2008-08-29 09:01:47 +0200186 if (likely(part)) {
187 if (part->partno)
188 return dev_to_disk(part_to_dev(part)->parent);
189 else
190 return dev_to_disk(part_to_dev(part));
191 }
Tejun Heo310a2c12008-08-25 19:47:17 +0900192 return NULL;
193}
194
Will Drewry6d1d8052010-08-31 15:47:05 -0500195static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
196{
197 int i;
198 for (i = 0; i < 16; ++i) {
199 *to++ = (hex_to_bin(*uuid_str) << 4) |
200 (hex_to_bin(*(uuid_str + 1)));
201 uuid_str += 2;
202 switch (i) {
203 case 3:
204 case 5:
205 case 7:
206 case 9:
207 uuid_str++;
208 continue;
209 }
210 }
211}
212
213static inline char *part_unpack_uuid(const u8 *uuid, char *out)
214{
215 sprintf(out, "%pU", uuid);
216 return out;
217}
218
Tejun Heof331c022008-09-03 09:01:48 +0200219static inline int disk_max_parts(struct gendisk *disk)
220{
Tejun Heo689d6fa2008-08-25 19:56:16 +0900221 if (disk->flags & GENHD_FL_EXT_DEVT)
222 return DISK_MAX_PARTS;
223 return disk->minors;
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200224}
225
226static inline bool disk_partitionable(struct gendisk *disk)
227{
228 return disk_max_parts(disk) > 1;
Tejun Heof331c022008-09-03 09:01:48 +0200229}
230
231static inline dev_t disk_devt(struct gendisk *disk)
232{
Tejun Heoed9e1982008-08-25 19:56:05 +0900233 return disk_to_dev(disk)->devt;
Tejun Heof331c022008-09-03 09:01:48 +0200234}
235
236static inline dev_t part_devt(struct hd_struct *part)
237{
Tejun Heoed9e1982008-08-25 19:56:05 +0900238 return part_to_dev(part)->devt;
Tejun Heof331c022008-09-03 09:01:48 +0200239}
240
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200241extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
242
243static inline void disk_put_part(struct hd_struct *part)
244{
245 if (likely(part))
Tejun Heoed9e1982008-08-25 19:56:05 +0900246 put_device(part_to_dev(part));
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200247}
248
249/*
250 * Smarter partition iterator without context limits.
251 */
252#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
253#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
Tejun Heob5d0b9d2008-09-03 09:06:42 +0200254#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
Tejun Heo71982a42009-04-17 08:34:48 +0200255#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
Tejun Heoe71bf0d2008-09-03 09:03:02 +0200256
257struct disk_part_iter {
258 struct gendisk *disk;
259 struct hd_struct *part;
260 int idx;
261 unsigned int flags;
262};
263
264extern void disk_part_iter_init(struct disk_part_iter *piter,
265 struct gendisk *disk, unsigned int flags);
266extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
267extern void disk_part_iter_exit(struct disk_part_iter *piter);
268
269extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
270 sector_t sector);
271
Tejun Heoc9959052008-08-25 19:47:21 +0900272/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 * Macros to operate on percpu disk statistics:
274 *
Tejun Heoc9959052008-08-25 19:47:21 +0900275 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
276 * and should be called between disk_stat_lock() and
277 * disk_stat_unlock().
278 *
279 * part_stat_read() can be called at any time.
280 *
281 * part_stat_{add|set_all}() and {init|free}_part_stats are for
282 * internal use only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 */
284#ifdef CONFIG_SMP
Tejun Heo074a7ac2008-08-25 19:56:14 +0900285#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
286#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
Tejun Heoc9959052008-08-25 19:47:21 +0900287
Tejun Heo074a7ac2008-08-25 19:56:14 +0900288#define __part_stat_add(cpu, part, field, addnd) \
289 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100290
291#define part_stat_read(part, field) \
292({ \
Tejun Heo074a7ac2008-08-25 19:56:14 +0900293 typeof((part)->dkstats->field) res = 0; \
Stephen Hemminger7af92f82010-01-06 15:45:55 -0800294 unsigned int _cpu; \
295 for_each_possible_cpu(_cpu) \
296 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100297 res; \
298})
299
Jens Axboe28f13702008-05-07 10:15:46 +0200300static inline void part_stat_set_all(struct hd_struct *part, int value)
301{
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100302 int i;
Jens Axboe28f13702008-05-07 10:15:46 +0200303
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100304 for_each_possible_cpu(i)
305 memset(per_cpu_ptr(part->dkstats, i), value,
Jens Axboe28f13702008-05-07 10:15:46 +0200306 sizeof(struct disk_stats));
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100307}
Tejun Heoc9959052008-08-25 19:47:21 +0900308
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100309static inline int init_part_stats(struct hd_struct *part)
310{
311 part->dkstats = alloc_percpu(struct disk_stats);
312 if (!part->dkstats)
313 return 0;
314 return 1;
315}
316
317static inline void free_part_stats(struct hd_struct *part)
318{
319 free_percpu(part->dkstats);
320}
321
Tejun Heo074a7ac2008-08-25 19:56:14 +0900322#else /* !CONFIG_SMP */
323#define part_stat_lock() ({ rcu_read_lock(); 0; })
324#define part_stat_unlock() rcu_read_unlock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Tejun Heo074a7ac2008-08-25 19:56:14 +0900326#define __part_stat_add(cpu, part, field, addnd) \
327 ((part)->dkstats.field += addnd)
328
329#define part_stat_read(part, field) ((part)->dkstats.field)
330
331static inline void part_stat_set_all(struct hd_struct *part, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
Tejun Heo074a7ac2008-08-25 19:56:14 +0900333 memset(&part->dkstats, value, sizeof(struct disk_stats));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
Jerome Marchandea5c48a2008-02-08 11:04:09 +0100335
336static inline int init_part_stats(struct hd_struct *part)
337{
338 return 1;
339}
340
341static inline void free_part_stats(struct hd_struct *part)
342{
343}
Tejun Heo074a7ac2008-08-25 19:56:14 +0900344
345#endif /* CONFIG_SMP */
346
347#define part_stat_add(cpu, part, field, addnd) do { \
348 __part_stat_add((cpu), (part), field, addnd); \
349 if ((part)->partno) \
350 __part_stat_add((cpu), &part_to_disk((part))->part0, \
351 field, addnd); \
352} while (0)
353
354#define part_stat_dec(cpu, gendiskp, field) \
355 part_stat_add(cpu, gendiskp, field, -1)
356#define part_stat_inc(cpu, gendiskp, field) \
357 part_stat_add(cpu, gendiskp, field, 1)
358#define part_stat_sub(cpu, gendiskp, field, subnd) \
359 part_stat_add(cpu, gendiskp, field, -subnd)
360
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200361static inline void part_inc_in_flight(struct hd_struct *part, int rw)
Tejun Heo074a7ac2008-08-25 19:56:14 +0900362{
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200363 part->in_flight[rw]++;
Tejun Heo074a7ac2008-08-25 19:56:14 +0900364 if (part->partno)
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200365 part_to_disk(part)->part0.in_flight[rw]++;
Tejun Heo074a7ac2008-08-25 19:56:14 +0900366}
367
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200368static inline void part_dec_in_flight(struct hd_struct *part, int rw)
Tejun Heo074a7ac2008-08-25 19:56:14 +0900369{
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200370 part->in_flight[rw]--;
Tejun Heo074a7ac2008-08-25 19:56:14 +0900371 if (part->partno)
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200372 part_to_disk(part)->part0.in_flight[rw]--;
373}
374
375static inline int part_in_flight(struct hd_struct *part)
376{
377 return part->in_flight[0] + part->in_flight[1];
Tejun Heo074a7ac2008-08-25 19:56:14 +0900378}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
Will Drewry6d1d8052010-08-31 15:47:05 -0500380static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
381{
382 if (disk)
383 return kzalloc_node(sizeof(struct partition_meta_info),
384 GFP_KERNEL, disk->node_id);
385 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
386}
387
388static inline void free_part_info(struct hd_struct *part)
389{
390 kfree(part->info);
391}
392
Petros Koutoupisd3992282009-03-11 10:49:35 +0100393/* block/blk-core.c */
Tejun Heoc9959052008-08-25 19:47:21 +0900394extern void part_round_stats(int cpu, struct hd_struct *part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Petros Koutoupis32ca1632009-03-10 08:25:54 +0100396/* block/genhd.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397extern void add_disk(struct gendisk *disk);
398extern void del_gendisk(struct gendisk *gp);
399extern void unlink_gendisk(struct gendisk *gp);
Tejun Heocf771cb2008-09-03 09:01:09 +0200400extern struct gendisk *get_gendisk(dev_t dev, int *partno);
Tejun Heof331c022008-09-03 09:01:48 +0200401extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403extern void set_device_ro(struct block_device *bdev, int flag);
404extern void set_disk_ro(struct gendisk *disk, int flag);
405
Tejun Heob7db9952008-08-25 19:56:10 +0900406static inline int get_disk_ro(struct gendisk *disk)
407{
408 return disk->part0.policy;
409}
410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411/* drivers/char/random.c */
412extern void add_disk_randomness(struct gendisk *disk);
413extern void rand_initialize_disk(struct gendisk *disk);
414
415static inline sector_t get_start_sect(struct block_device *bdev)
416{
Tejun Heo0762b8b2008-08-25 19:56:12 +0900417 return bdev->bd_part->start_sect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419static inline sector_t get_capacity(struct gendisk *disk)
420{
Tejun Heo80795ae2008-08-25 19:56:07 +0900421 return disk->part0.nr_sects;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423static inline void set_capacity(struct gendisk *disk, sector_t size)
424{
Tejun Heo80795ae2008-08-25 19:56:07 +0900425 disk->part0.nr_sects = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426}
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428#ifdef CONFIG_SOLARIS_X86_PARTITION
429
Mark Fortescueb84d8792007-07-25 18:30:08 -0700430#define SOLARIS_X86_NUMSLICE 16
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
432
433struct solaris_x86_slice {
434 __le16 s_tag; /* ID tag of partition */
435 __le16 s_flag; /* permission flags */
436 __le32 s_start; /* start sector no of partition */
437 __le32 s_size; /* # of blocks in partition */
438};
439
440struct solaris_x86_vtoc {
441 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
442 __le32 v_sanity; /* to verify vtoc sanity */
443 __le32 v_version; /* layout version */
444 char v_volume[8]; /* volume name */
445 __le16 v_sectorsz; /* sector size in bytes */
446 __le16 v_nparts; /* number of partitions */
447 unsigned int v_reserved[10]; /* free space */
448 struct solaris_x86_slice
449 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
450 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
451 char v_asciilabel[128]; /* for compatibility */
452};
453
454#endif /* CONFIG_SOLARIS_X86_PARTITION */
455
456#ifdef CONFIG_BSD_DISKLABEL
457/*
458 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
459 * updated by Marc Espie <Marc.Espie@openbsd.org>
460 */
461
462/* check against BSD src/sys/sys/disklabel.h for consistency */
463
464#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
465#define BSD_MAXPARTITIONS 16
466#define OPENBSD_MAXPARTITIONS 16
467#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
468struct bsd_disklabel {
469 __le32 d_magic; /* the magic number */
470 __s16 d_type; /* drive type */
471 __s16 d_subtype; /* controller/d_type specific */
472 char d_typename[16]; /* type name, e.g. "eagle" */
473 char d_packname[16]; /* pack identifier */
474 __u32 d_secsize; /* # of bytes per sector */
475 __u32 d_nsectors; /* # of data sectors per track */
476 __u32 d_ntracks; /* # of tracks per cylinder */
477 __u32 d_ncylinders; /* # of data cylinders per unit */
478 __u32 d_secpercyl; /* # of data sectors per cylinder */
479 __u32 d_secperunit; /* # of data sectors per unit */
480 __u16 d_sparespertrack; /* # of spare sectors per track */
481 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
482 __u32 d_acylinders; /* # of alt. cylinders per unit */
483 __u16 d_rpm; /* rotational speed */
484 __u16 d_interleave; /* hardware sector interleave */
485 __u16 d_trackskew; /* sector 0 skew, per track */
486 __u16 d_cylskew; /* sector 0 skew, per cylinder */
487 __u32 d_headswitch; /* head switch time, usec */
488 __u32 d_trkseek; /* track-to-track seek, usec */
489 __u32 d_flags; /* generic flags */
490#define NDDATA 5
491 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
492#define NSPARE 5
493 __u32 d_spare[NSPARE]; /* reserved for future use */
494 __le32 d_magic2; /* the magic number (again) */
495 __le16 d_checksum; /* xor of data incl. partitions */
496
497 /* filesystem and partition information: */
498 __le16 d_npartitions; /* number of partitions in following */
499 __le32 d_bbsize; /* size of boot area at sn0, bytes */
500 __le32 d_sbsize; /* max size of fs superblock, bytes */
501 struct bsd_partition { /* the partition table */
502 __le32 p_size; /* number of sectors in partition */
503 __le32 p_offset; /* starting sector */
504 __le32 p_fsize; /* filesystem basic fragment size */
505 __u8 p_fstype; /* filesystem type, see below */
506 __u8 p_frag; /* filesystem fragments per block */
507 __le16 p_cpg; /* filesystem cylinders per group */
508 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
509};
510
511#endif /* CONFIG_BSD_DISKLABEL */
512
513#ifdef CONFIG_UNIXWARE_DISKLABEL
514/*
515 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
516 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
517 */
518
519#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
520#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
521#define UNIXWARE_NUMSLICE 16
522#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
523
524struct unixware_slice {
525 __le16 s_label; /* label */
526 __le16 s_flags; /* permission flags */
527 __le32 start_sect; /* starting sector */
528 __le32 nr_sects; /* number of sectors in slice */
529};
530
531struct unixware_disklabel {
532 __le32 d_type; /* drive type */
533 __le32 d_magic; /* the magic number */
534 __le32 d_version; /* version number */
535 char d_serial[12]; /* serial number of the device */
536 __le32 d_ncylinders; /* # of data cylinders per device */
537 __le32 d_ntracks; /* # of tracks per cylinder */
538 __le32 d_nsectors; /* # of data sectors per track */
539 __le32 d_secsize; /* # of bytes per sector */
540 __le32 d_part_start; /* # of first sector of this partition */
541 __le32 d_unknown1[12]; /* ? */
542 __le32 d_alt_tbl; /* byte offset of alternate table */
543 __le32 d_alt_len; /* byte length of alternate table */
544 __le32 d_phys_cyl; /* # of physical cylinders per device */
545 __le32 d_phys_trk; /* # of physical tracks per cylinder */
546 __le32 d_phys_sec; /* # of physical sectors per track */
547 __le32 d_phys_bytes; /* # of physical bytes per sector */
548 __le32 d_unknown2; /* ? */
549 __le32 d_unknown3; /* ? */
550 __le32 d_pad[8]; /* pad */
551
552 struct unixware_vtoc {
553 __le32 v_magic; /* the magic number */
554 __le32 v_version; /* version number */
555 char v_name[8]; /* volume name */
556 __le16 v_nslices; /* # of slices */
557 __le16 v_unknown1; /* ? */
558 __le32 v_reserved[10]; /* reserved */
559 struct unixware_slice
560 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
561 } vtoc;
562
563}; /* 408 */
564
565#endif /* CONFIG_UNIXWARE_DISKLABEL */
566
567#ifdef CONFIG_MINIX_SUBPARTITION
568# define MINIX_NR_SUBPARTITIONS 4
569#endif /* CONFIG_MINIX_SUBPARTITION */
570
Fabio Massimo Di Nittod18d7682007-02-10 23:50:00 -0800571#define ADDPART_FLAG_NONE 0
572#define ADDPART_FLAG_RAID 1
573#define ADDPART_FLAG_WHOLEDISK 2
574
Tejun Heobcce3de2008-08-25 19:47:22 +0900575extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
576extern void blk_free_devt(dev_t devt);
Tejun Heocf771cb2008-09-03 09:01:09 +0200577extern dev_t blk_lookup_devt(const char *name, int partno);
578extern char *disk_name (struct gendisk *hd, int partno, char *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Tejun Heo540eed52008-08-25 19:56:15 +0900580extern int disk_expand_part_tbl(struct gendisk *disk, int target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
Tejun Heoba329292008-11-10 15:29:58 +0900582extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
583 int partno, sector_t start,
Will Drewry6d1d8052010-08-31 15:47:05 -0500584 sector_t len, int flags,
585 struct partition_meta_info
586 *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587extern void delete_partition(struct gendisk *, int);
Dave Gilbertdd2a3452007-05-09 02:33:24 -0700588extern void printk_all_partitions(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Christoph Lameter19460892005-06-23 00:08:19 -0700590extern struct gendisk *alloc_disk_node(int minors, int node_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591extern struct gendisk *alloc_disk(int minors);
592extern struct kobject *get_disk(struct gendisk *disk);
593extern void put_disk(struct gendisk *disk);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200594extern void blk_register_region(dev_t devt, unsigned long range,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 struct module *module,
596 struct kobject *(*probe)(dev_t, int *, void *),
597 int (*lock)(dev_t, void *),
598 void *data);
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200599extern void blk_unregister_region(dev_t devt, unsigned long range);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Tejun Heoe5610522008-08-25 19:56:09 +0900601extern ssize_t part_size_show(struct device *dev,
602 struct device_attribute *attr, char *buf);
Tejun Heo074a7ac2008-08-25 19:56:14 +0900603extern ssize_t part_stat_show(struct device *dev,
604 struct device_attribute *attr, char *buf);
Nikanth Karthikesan316d3152009-10-06 20:16:55 +0200605extern ssize_t part_inflight_show(struct device *dev,
606 struct device_attribute *attr, char *buf);
Tejun Heoeddb2e22008-08-25 19:56:13 +0900607#ifdef CONFIG_FAIL_MAKE_REQUEST
608extern ssize_t part_fail_show(struct device *dev,
609 struct device_attribute *attr, char *buf);
610extern ssize_t part_fail_store(struct device *dev,
611 struct device_attribute *attr,
612 const char *buf, size_t count);
613#endif /* CONFIG_FAIL_MAKE_REQUEST */
Tejun Heoe5610522008-08-25 19:56:09 +0900614
Jens Axboe87c1efb2007-05-11 13:29:54 +0200615#else /* CONFIG_BLOCK */
616
617static inline void printk_all_partitions(void) { }
618
Tejun Heocf771cb2008-09-03 09:01:09 +0200619static inline dev_t blk_lookup_devt(const char *name, int partno)
Kay Sieversedfaa7c2007-05-21 22:08:01 +0200620{
621 dev_t devt = MKDEV(0, 0);
622 return devt;
623}
624
Jens Axboe87c1efb2007-05-11 13:29:54 +0200625#endif /* CONFIG_BLOCK */
David Howells93614012006-09-30 20:45:40 +0200626
David Woodhousea8ae50b2008-03-12 17:52:56 +0100627#endif /* _LINUX_GENHD_H */