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block: make partition array dynamic
[deliverable/linux.git] / include / linux / genhd.h
CommitLineData
1da177e4
LT		 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
1da177e4 12#include <linux/types.h>
edfaa7c3 13#include <linux/kdev_t.h>
e71bf0d0 14#include <linux/rcupdate.h>
1da177e4 15
9361401e
DH		 16#ifdef CONFIG_BLOCK
17
ed9e1982 18#define kobj_to_dev(k) container_of((k), struct device, kobj)
548b10eb 19#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
ed9e1982 20#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
548b10eb 21#define disk_to_dev(disk) (&(disk)->part0.__dev)
ed9e1982 22#define part_to_dev(part) (&((part)->__dev))
edfaa7c3 23
edfaa7c3
KS		 24extern struct device_type part_type;
25extern struct kobject *block_depr;
26extern struct class block_class;
27
a0db701a
AB		 28extern const struct seq_operations partitions_op;
29extern const struct seq_operations diskstats_op;
30
1da177e4
LT		 31enum {
32/* These three have identical behaviour; use the second one if DOS FDISK gets
33 confused about extended/logical partitions starting past cylinder 1023. */
34 DOS_EXTENDED_PARTITION = 5,
35 LINUX_EXTENDED_PARTITION = 0x85,
36 WIN98_EXTENDED_PARTITION = 0x0f,
37
d18d7682
FMDN		 38 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
39
1da177e4 40 LINUX_SWAP_PARTITION = 0x82,
4419d1ac
OH		 41 LINUX_DATA_PARTITION = 0x83,
42 LINUX_LVM_PARTITION = 0x8e,
1da177e4
LT		 43 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
44
45 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
46 NEW_SOLARIS_X86_PARTITION = 0xbf,
47
48 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
49 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
50 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
51 EZD_PARTITION = 0x55, /* EZ-DRIVE */
52
53 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
54 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
55 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
56 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
57 MINIX_PARTITION = 0x81, /* Minix Partition ID */
58 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
59};
60
34186efc
DW		 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>
8ce7ad7b 66#include <linux/workqueue.h>
34186efc 67
1da177e4
LT		 68struct 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
ea5c48ab
JM		 81struct 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
1da177e4
LT		 90struct hd_struct {
91 sector_t start_sect;
92 sector_t nr_sects;
ed9e1982 93 struct device __dev;
6a4d44c1 94 struct kobject *holder_dir;
1da177e4 95 int policy, partno;
c17bb495
AM		 96#ifdef CONFIG_FAIL_MAKE_REQUEST
97 int make_it_fail;
ea5c48ab
JM		 98#endif
99 unsigned long stamp;
100 int in_flight;
101#ifdef CONFIG_SMP
102 struct disk_stats *dkstats;
103#else
104 struct disk_stats dkstats;
c17bb495 105#endif
e71bf0d0 106 struct rcu_head rcu_head;
1da177e4
LT		 107};
108
109#define GENHD_FL_REMOVABLE 1
110#define GENHD_FL_DRIVERFS 2
86ce18d7 111#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
1da177e4
LT		 112#define GENHD_FL_CD 8
113#define GENHD_FL_UP 16
114#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
115
540eed56
TH		 116#define BLK_SCSI_MAX_CMDS (256)
117#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
118
119struct blk_scsi_cmd_filter {
120 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
121 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
122 struct kobject kobj;
123};
124
125struct disk_part_tbl {
126 struct rcu_head rcu_head;
127 int len;
128 struct hd_struct *part[];
129};
130
1da177e4 131struct gendisk {
bcce3de1
TH		 132 /* major, first_minor, minors and ext_minors are input
133 * parameters only, don't use directly. Use disk_devt() and
134 * disk_max_parts().
f331c029 135 */
1da177e4
LT		 136 int major; /* major number of driver */
137 int first_minor;
138 int minors; /* maximum number of minors, =1 for
139 * disks that can't be partitioned. */
bcce3de1 140 int ext_minors; /* number of extended dynamic minors */
f331c029 141
1da177e4 142 char disk_name[32]; /* name of major driver */
e71bf0d0 143
b5d0b9df 144 /* Array of pointers to partitions indexed by partno.
e71bf0d0
TH		 145 * Protected with matching bdev lock but stat and other
146 * non-critical accesses use RCU. Always access through
147 * helpers.
148 */
540eed56 149 struct disk_part_tbl *part_tbl;
b5d0b9df 150 struct hd_struct part0;
e71bf0d0 151
1da177e4
LT		 152 struct block_device_operations *fops;
153 struct request_queue *queue;
154 void *private_data;
1da177e4
LT		 155
156 int flags;
edfaa7c3 157 struct device *driverfs_dev; // FIXME: remove
6a4d44c1 158 struct kobject *slave_dir;
1da177e4
LT		 159
160 struct timer_rand_state *random;
1da177e4
LT		 161
162 atomic_t sync_io; /* RAID */
8ce7ad7b 163 struct work_struct async_notify;
7ba1ba12
MP		 164#ifdef CONFIG_BLK_DEV_INTEGRITY
165 struct blk_integrity *integrity;
166#endif
540eed56 167 int node_id;
1da177e4
LT		 168};
169
310a2c10
TH		 170static inline struct gendisk *part_to_disk(struct hd_struct *part)
171{
548b10eb
TH		 172 if (likely(part)) {
173 if (part->partno)
174 return dev_to_disk(part_to_dev(part)->parent);
175 else
176 return dev_to_disk(part_to_dev(part));
177 }
310a2c10
TH		 178 return NULL;
179}
180
f331c029
TH		 181static inline int disk_max_parts(struct gendisk *disk)
182{
b5d0b9df
TH		 183 return disk->minors + disk->ext_minors;
184}
185
186static inline bool disk_partitionable(struct gendisk *disk)
187{
188 return disk_max_parts(disk) > 1;
f331c029
TH		 189}
190
191static inline dev_t disk_devt(struct gendisk *disk)
192{
ed9e1982 193 return disk_to_dev(disk)->devt;
f331c029
TH		 194}
195
196static inline dev_t part_devt(struct hd_struct *part)
197{
ed9e1982 198 return part_to_dev(part)->devt;
f331c029
TH		 199}
200
e71bf0d0
TH		 201extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
202
203static inline void disk_put_part(struct hd_struct *part)
204{
205 if (likely(part))
ed9e1982 206 put_device(part_to_dev(part));
e71bf0d0
TH		 207}
208
209/*
210 * Smarter partition iterator without context limits.
211 */
212#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
213#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df 214#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
e71bf0d0
TH		 215
216struct disk_part_iter {
217 struct gendisk *disk;
218 struct hd_struct *part;
219 int idx;
220 unsigned int flags;
221};
222
223extern void disk_part_iter_init(struct disk_part_iter *piter,
224 struct gendisk *disk, unsigned int flags);
225extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
226extern void disk_part_iter_exit(struct disk_part_iter *piter);
227
228extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
229 sector_t sector);
230
c9959059 231/*
1da177e4
LT		 232 * Macros to operate on percpu disk statistics:
233 *
c9959059
TH		 234 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
235 * and should be called between disk_stat_lock() and
236 * disk_stat_unlock().
237 *
238 * part_stat_read() can be called at any time.
239 *
240 * part_stat_{add|set_all}() and {init|free}_part_stats are for
241 * internal use only.
1da177e4
LT		 242 */
243#ifdef CONFIG_SMP
074a7aca
TH		 244#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
245#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
ea5c48ab 246
074a7aca
TH		 247#define __part_stat_add(cpu, part, field, addnd) \
248 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
ea5c48ab
JM		 249
250#define part_stat_read(part, field) \
251({ \
074a7aca 252 typeof((part)->dkstats->field) res = 0; \
ea5c48ab
JM		 253 int i; \
254 for_each_possible_cpu(i) \
074a7aca 255 res += per_cpu_ptr((part)->dkstats, i)->field; \
ea5c48ab
JM		 256 res; \
257})
258
28f13702
JA		 259static inline void part_stat_set_all(struct hd_struct *part, int value)
260{
ea5c48ab 261 int i;
28f13702 262
ea5c48ab
JM		 263 for_each_possible_cpu(i)
264 memset(per_cpu_ptr(part->dkstats, i), value,
28f13702 265 sizeof(struct disk_stats));
ea5c48ab 266}
c9959059 267
074a7aca 268static inline int init_part_stats(struct hd_struct *part)
ea5c48ab 269{
074a7aca
TH		 270 part->dkstats = alloc_percpu(struct disk_stats);
271 if (!part->dkstats)
272 return 0;
273 return 1;
1da177e4 274}
ea5c48ab 275
074a7aca 276static inline void free_part_stats(struct hd_struct *part)
ea5c48ab 277{
074a7aca 278 free_percpu(part->dkstats);
ea5c48ab
JM		 279}
280
074a7aca
TH		 281#else /* !CONFIG_SMP */
282#define part_stat_lock() ({ rcu_read_lock(); 0; })
283#define part_stat_unlock() rcu_read_unlock()
c9959059 284
074a7aca
TH		 285#define __part_stat_add(cpu, part, field, addnd) \
286 ((part)->dkstats.field += addnd)
1da177e4 287
074a7aca 288#define part_stat_read(part, field) ((part)->dkstats.field)
1da177e4 289
074a7aca 290static inline void part_stat_set_all(struct hd_struct *part, int value)
1da177e4 291{
074a7aca 292 memset(&part->dkstats, value, sizeof(struct disk_stats));
1da177e4 293}
ea5c48ab
JM		 294
295static inline int init_part_stats(struct hd_struct *part)
296{
ea5c48ab
JM		 297 return 1;
298}
299
300static inline void free_part_stats(struct hd_struct *part)
301{
ea5c48ab
JM		 302}
303
074a7aca 304#endif /* CONFIG_SMP */
1da177e4 305
074a7aca
TH		 306#define part_stat_add(cpu, part, field, addnd) do { \
307 __part_stat_add((cpu), (part), field, addnd); \
308 if ((part)->partno) \
309 __part_stat_add((cpu), &part_to_disk((part))->part0, \
310 field, addnd); \
311} while (0)
ea5c48ab 312
074a7aca
TH		 313#define part_stat_dec(cpu, gendiskp, field) \
314 part_stat_add(cpu, gendiskp, field, -1)
315#define part_stat_inc(cpu, gendiskp, field) \
316 part_stat_add(cpu, gendiskp, field, 1)
317#define part_stat_sub(cpu, gendiskp, field, subnd) \
318 part_stat_add(cpu, gendiskp, field, -subnd)
319
320static inline void part_inc_in_flight(struct hd_struct *part)
ea5c48ab 321{
074a7aca
TH		 322 part->in_flight++;
323 if (part->partno)
324 part_to_disk(part)->part0.in_flight++;
ea5c48ab
JM		 325}
326
074a7aca 327static inline void part_dec_in_flight(struct hd_struct *part)
ea5c48ab 328{
074a7aca
TH		 329 part->in_flight--;
330 if (part->partno)
331 part_to_disk(part)->part0.in_flight--;
ea5c48ab 332}
1da177e4
LT		 333
334/* drivers/block/ll_rw_blk.c */
c9959059 335extern void part_round_stats(int cpu, struct hd_struct *part);
1da177e4
LT		 336
337/* drivers/block/genhd.c */
ac20427e 338extern int get_blkdev_list(char *, int);
1da177e4
LT		 339extern void add_disk(struct gendisk *disk);
340extern void del_gendisk(struct gendisk *gp);
341extern void unlink_gendisk(struct gendisk *gp);
cf771cb5 342extern struct gendisk *get_gendisk(dev_t dev, int *partno);
f331c029 343extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
1da177e4
LT		 344
345extern void set_device_ro(struct block_device *bdev, int flag);
346extern void set_disk_ro(struct gendisk *disk, int flag);
347
b7db9956
TH		 348static inline int get_disk_ro(struct gendisk *disk)
349{
350 return disk->part0.policy;
351}
352
1da177e4
LT		 353/* drivers/char/random.c */
354extern void add_disk_randomness(struct gendisk *disk);
355extern void rand_initialize_disk(struct gendisk *disk);
356
357static inline sector_t get_start_sect(struct block_device *bdev)
358{
0762b8bd 359 return bdev->bd_part->start_sect;
1da177e4
LT		 360}
361static inline sector_t get_capacity(struct gendisk *disk)
362{
80795aef 363 return disk->part0.nr_sects;
1da177e4
LT		 364}
365static inline void set_capacity(struct gendisk *disk, sector_t size)
366{
80795aef 367 disk->part0.nr_sects = size;
1da177e4
LT		 368}
369
1da177e4
LT		 370#ifdef CONFIG_SOLARIS_X86_PARTITION
371
b84d8796 372#define SOLARIS_X86_NUMSLICE 16
1da177e4
LT		 373#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
374
375struct solaris_x86_slice {
376 __le16 s_tag; /* ID tag of partition */
377 __le16 s_flag; /* permission flags */
378 __le32 s_start; /* start sector no of partition */
379 __le32 s_size; /* # of blocks in partition */
380};
381
382struct solaris_x86_vtoc {
383 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
384 __le32 v_sanity; /* to verify vtoc sanity */
385 __le32 v_version; /* layout version */
386 char v_volume[8]; /* volume name */
387 __le16 v_sectorsz; /* sector size in bytes */
388 __le16 v_nparts; /* number of partitions */
389 unsigned int v_reserved[10]; /* free space */
390 struct solaris_x86_slice
391 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
392 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
393 char v_asciilabel[128]; /* for compatibility */
394};
395
396#endif /* CONFIG_SOLARIS_X86_PARTITION */
397
398#ifdef CONFIG_BSD_DISKLABEL
399/*
400 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
401 * updated by Marc Espie <Marc.Espie@openbsd.org>
402 */
403
404/* check against BSD src/sys/sys/disklabel.h for consistency */
405
406#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
407#define BSD_MAXPARTITIONS 16
408#define OPENBSD_MAXPARTITIONS 16
409#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
410struct bsd_disklabel {
411 __le32 d_magic; /* the magic number */
412 __s16 d_type; /* drive type */
413 __s16 d_subtype; /* controller/d_type specific */
414 char d_typename[16]; /* type name, e.g. "eagle" */
415 char d_packname[16]; /* pack identifier */
416 __u32 d_secsize; /* # of bytes per sector */
417 __u32 d_nsectors; /* # of data sectors per track */
418 __u32 d_ntracks; /* # of tracks per cylinder */
419 __u32 d_ncylinders; /* # of data cylinders per unit */
420 __u32 d_secpercyl; /* # of data sectors per cylinder */
421 __u32 d_secperunit; /* # of data sectors per unit */
422 __u16 d_sparespertrack; /* # of spare sectors per track */
423 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
424 __u32 d_acylinders; /* # of alt. cylinders per unit */
425 __u16 d_rpm; /* rotational speed */
426 __u16 d_interleave; /* hardware sector interleave */
427 __u16 d_trackskew; /* sector 0 skew, per track */
428 __u16 d_cylskew; /* sector 0 skew, per cylinder */
429 __u32 d_headswitch; /* head switch time, usec */
430 __u32 d_trkseek; /* track-to-track seek, usec */
431 __u32 d_flags; /* generic flags */
432#define NDDATA 5
433 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
434#define NSPARE 5
435 __u32 d_spare[NSPARE]; /* reserved for future use */
436 __le32 d_magic2; /* the magic number (again) */
437 __le16 d_checksum; /* xor of data incl. partitions */
438
439 /* filesystem and partition information: */
440 __le16 d_npartitions; /* number of partitions in following */
441 __le32 d_bbsize; /* size of boot area at sn0, bytes */
442 __le32 d_sbsize; /* max size of fs superblock, bytes */
443 struct bsd_partition { /* the partition table */
444 __le32 p_size; /* number of sectors in partition */
445 __le32 p_offset; /* starting sector */
446 __le32 p_fsize; /* filesystem basic fragment size */
447 __u8 p_fstype; /* filesystem type, see below */
448 __u8 p_frag; /* filesystem fragments per block */
449 __le16 p_cpg; /* filesystem cylinders per group */
450 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
451};
452
453#endif /* CONFIG_BSD_DISKLABEL */
454
455#ifdef CONFIG_UNIXWARE_DISKLABEL
456/*
457 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
458 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
459 */
460
461#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
462#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
463#define UNIXWARE_NUMSLICE 16
464#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
465
466struct unixware_slice {
467 __le16 s_label; /* label */
468 __le16 s_flags; /* permission flags */
469 __le32 start_sect; /* starting sector */
470 __le32 nr_sects; /* number of sectors in slice */
471};
472
473struct unixware_disklabel {
474 __le32 d_type; /* drive type */
475 __le32 d_magic; /* the magic number */
476 __le32 d_version; /* version number */
477 char d_serial[12]; /* serial number of the device */
478 __le32 d_ncylinders; /* # of data cylinders per device */
479 __le32 d_ntracks; /* # of tracks per cylinder */
480 __le32 d_nsectors; /* # of data sectors per track */
481 __le32 d_secsize; /* # of bytes per sector */
482 __le32 d_part_start; /* # of first sector of this partition */
483 __le32 d_unknown1[12]; /* ? */
484 __le32 d_alt_tbl; /* byte offset of alternate table */
485 __le32 d_alt_len; /* byte length of alternate table */
486 __le32 d_phys_cyl; /* # of physical cylinders per device */
487 __le32 d_phys_trk; /* # of physical tracks per cylinder */
488 __le32 d_phys_sec; /* # of physical sectors per track */
489 __le32 d_phys_bytes; /* # of physical bytes per sector */
490 __le32 d_unknown2; /* ? */
491 __le32 d_unknown3; /* ? */
492 __le32 d_pad[8]; /* pad */
493
494 struct unixware_vtoc {
495 __le32 v_magic; /* the magic number */
496 __le32 v_version; /* version number */
497 char v_name[8]; /* volume name */
498 __le16 v_nslices; /* # of slices */
499 __le16 v_unknown1; /* ? */
500 __le32 v_reserved[10]; /* reserved */
501 struct unixware_slice
502 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
503 } vtoc;
504
505}; /* 408 */
506
507#endif /* CONFIG_UNIXWARE_DISKLABEL */
508
509#ifdef CONFIG_MINIX_SUBPARTITION
510# define MINIX_NR_SUBPARTITIONS 4
511#endif /* CONFIG_MINIX_SUBPARTITION */
512
d18d7682
FMDN		 513#define ADDPART_FLAG_NONE 0
514#define ADDPART_FLAG_RAID 1
515#define ADDPART_FLAG_WHOLEDISK 2
516
bcce3de1
TH		 517extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
518extern void blk_free_devt(dev_t devt);
cf771cb5
TH		 519extern dev_t blk_lookup_devt(const char *name, int partno);
520extern char *disk_name (struct gendisk *hd, int partno, char *buf);
1da177e4 521
540eed56 522extern int disk_expand_part_tbl(struct gendisk *disk, int target);
1da177e4 523extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
d805dda4 524extern int __must_check add_partition(struct gendisk *, int, sector_t, sector_t, int);
1da177e4 525extern void delete_partition(struct gendisk *, int);
dd2a345f 526extern void printk_all_partitions(void);
1da177e4 527
1946089a 528extern struct gendisk *alloc_disk_node(int minors, int node_id);
1da177e4 529extern struct gendisk *alloc_disk(int minors);
bcce3de1
TH		 530extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
531 int node_id);
532extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
1da177e4
LT		 533extern struct kobject *get_disk(struct gendisk *disk);
534extern void put_disk(struct gendisk *disk);
edfaa7c3 535extern void blk_register_region(dev_t devt, unsigned long range,
1da177e4
LT		 536 struct module *module,
537 struct kobject *(*probe)(dev_t, int *, void *),
538 int (*lock)(dev_t, void *),
539 void *data);
edfaa7c3 540extern void blk_unregister_region(dev_t devt, unsigned long range);
1da177e4 541
e5610521
TH		 542extern ssize_t part_size_show(struct device *dev,
543 struct device_attribute *attr, char *buf);
074a7aca
TH		 544extern ssize_t part_stat_show(struct device *dev,
545 struct device_attribute *attr, char *buf);
eddb2e26
TH		 546#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 */
e5610521 553
87c1efbf
JA		 554#else /* CONFIG_BLOCK */
555
556static inline void printk_all_partitions(void) { }
557
cf771cb5 558static inline dev_t blk_lookup_devt(const char *name, int partno)
edfaa7c3
KS		 559{
560 dev_t devt = MKDEV(0, 0);
561 return devt;
562}
563
87c1efbf 564#endif /* CONFIG_BLOCK */
9361401e 565
a8ae50ba 566#endif /* _LINUX_GENHD_H */
Linux kernel - Deliverables
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