1 #ifndef _LINUX_GENHD_H
2 #define _LINUX_GENHD_H
3
4 /*
5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
7 * Drew Eckhardt
8 *
9 * <drew@colorado.edu>
10 */
11
12 #include <linux/types.h>
13 #include <linux/kdev_t.h>
14 #include <linux/rcupdate.h>
15 #include <linux/slab.h>
16 #include <linux/percpu-refcount.h>
17 #include <linux/uuid.h>
18
19 #ifdef CONFIG_BLOCK
20
21 #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
22 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
23 #define disk_to_dev(disk) (&(disk)->part0.__dev)
24 #define part_to_dev(part) (&((part)->__dev))
25
26 extern struct device_type part_type;
27 extern struct kobject *block_depr;
28 extern struct class block_class;
29
30 enum {
31 /* These three have identical behaviour; use the second one if DOS FDISK gets
32 confused about extended/logical partitions starting past cylinder 1023. */
33 DOS_EXTENDED_PARTITION = 5,
34 LINUX_EXTENDED_PARTITION = 0x85,
35 WIN98_EXTENDED_PARTITION = 0x0f,
36
37 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
38
39 LINUX_SWAP_PARTITION = 0x82,
40 LINUX_DATA_PARTITION = 0x83,
41 LINUX_LVM_PARTITION = 0x8e,
42 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
43
44 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
45 NEW_SOLARIS_X86_PARTITION = 0xbf,
46
47 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
48 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
49 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
50 EZD_PARTITION = 0x55, /* EZ-DRIVE */
51
52 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
53 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
54 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
55 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
56 MINIX_PARTITION = 0x81, /* Minix Partition ID */
57 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
58 };
59
60 #define DISK_MAX_PARTS 256
61 #define DISK_NAME_LEN 32
62
63 #include <linux/major.h>
64 #include <linux/device.h>
65 #include <linux/smp.h>
66 #include <linux/string.h>
67 #include <linux/fs.h>
68 #include <linux/workqueue.h>
69
70 struct partition {
71 unsigned char boot_ind; /* 0x80 - active */
72 unsigned char head; /* starting head */
73 unsigned char sector; /* starting sector */
74 unsigned char cyl; /* starting cylinder */
75 unsigned char sys_ind; /* What partition type */
76 unsigned char end_head; /* end head */
77 unsigned char end_sector; /* end sector */
78 unsigned char end_cyl; /* end cylinder */
79 __le32 start_sect; /* starting sector counting from 0 */
80 __le32 nr_sects; /* nr of sectors in partition */
81 } __attribute__((packed));
82
83 struct disk_stats {
84 unsigned long sectors[2]; /* READs and WRITEs */
85 unsigned long ios[2];
86 unsigned long merges[2];
87 unsigned long ticks[2];
88 unsigned long io_ticks;
89 unsigned long time_in_queue;
90 };
91
92 #define PARTITION_META_INFO_VOLNAMELTH 64
93 /*
94 * Enough for the string representation of any kind of UUID plus NULL.
95 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
96 */
97 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
98
99 struct partition_meta_info {
100 char uuid[PARTITION_META_INFO_UUIDLTH];
101 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
102 };
103
104 struct hd_struct {
105 sector_t start_sect;
106 /*
107 * nr_sects is protected by sequence counter. One might extend a
108 * partition while IO is happening to it and update of nr_sects
109 * can be non-atomic on 32bit machines with 64bit sector_t.
110 */
111 sector_t nr_sects;
112 seqcount_t nr_sects_seq;
113 sector_t alignment_offset;
114 unsigned int discard_alignment;
115 struct device __dev;
116 struct kobject *holder_dir;
117 int policy, partno;
118 struct partition_meta_info *info;
119 #ifdef CONFIG_FAIL_MAKE_REQUEST
120 int make_it_fail;
121 #endif
122 unsigned long stamp;
123 atomic_t in_flight[2];
124 #ifdef CONFIG_SMP
125 struct disk_stats __percpu *dkstats;
126 #else
127 struct disk_stats dkstats;
128 #endif
129 struct percpu_ref ref;
130 struct rcu_head rcu_head;
131 };
132
133 #define GENHD_FL_REMOVABLE 1
134 /* 2 is unused */
135 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
136 #define GENHD_FL_CD 8
137 #define GENHD_FL_UP 16
138 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
139 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
140 #define GENHD_FL_NATIVE_CAPACITY 128
141 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
142 #define GENHD_FL_NO_PART_SCAN 512
143
144 enum {
145 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
146 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
147 };
148
149 #define BLK_SCSI_MAX_CMDS (256)
150 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
151
152 struct blk_scsi_cmd_filter {
153 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
154 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
155 struct kobject kobj;
156 };
157
158 struct disk_part_tbl {
159 struct rcu_head rcu_head;
160 int len;
161 struct hd_struct __rcu *last_lookup;
162 struct hd_struct __rcu *part[];
163 };
164
165 struct disk_events;
166 struct badblocks;
167
168 #if defined(CONFIG_BLK_DEV_INTEGRITY)
169
170 struct blk_integrity {
171 struct blk_integrity_profile *profile;
172 unsigned char flags;
173 unsigned char tuple_size;
174 unsigned char interval_exp;
175 unsigned char tag_size;
176 };
177
178 #endif /* CONFIG_BLK_DEV_INTEGRITY */
179
180 struct gendisk {
181 /* major, first_minor and minors are input parameters only,
182 * don't use directly. Use disk_devt() and disk_max_parts().
183 */
184 int major; /* major number of driver */
185 int first_minor;
186 int minors; /* maximum number of minors, =1 for
187 * disks that can't be partitioned. */
188
189 char disk_name[DISK_NAME_LEN]; /* name of major driver */
190 char *(*devnode)(struct gendisk *gd, umode_t *mode);
191
192 unsigned int events; /* supported events */
193 unsigned int async_events; /* async events, subset of all */
194
195 /* Array of pointers to partitions indexed by partno.
196 * Protected with matching bdev lock but stat and other
197 * non-critical accesses use RCU. Always access through
198 * helpers.
199 */
200 struct disk_part_tbl __rcu *part_tbl;
201 struct hd_struct part0;
202
203 const struct block_device_operations *fops;
204 struct request_queue *queue;
205 void *private_data;
206
207 int flags;
208 struct kobject *slave_dir;
209
210 struct timer_rand_state *random;
211 atomic_t sync_io; /* RAID */
212 struct disk_events *ev;
213 #ifdef CONFIG_BLK_DEV_INTEGRITY
214 struct kobject integrity_kobj;
215 #endif /* CONFIG_BLK_DEV_INTEGRITY */
216 int node_id;
217 struct badblocks *bb;
218 };
219
part_to_disk(struct hd_struct * part)220 static inline struct gendisk *part_to_disk(struct hd_struct *part)
221 {
222 if (likely(part)) {
223 if (part->partno)
224 return dev_to_disk(part_to_dev(part)->parent);
225 else
226 return dev_to_disk(part_to_dev(part));
227 }
228 return NULL;
229 }
230
blk_part_pack_uuid(const u8 * uuid_str,u8 * to)231 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
232 {
233 uuid_be_to_bin(uuid_str, (uuid_be *)to);
234 return 0;
235 }
236
disk_max_parts(struct gendisk * disk)237 static inline int disk_max_parts(struct gendisk *disk)
238 {
239 if (disk->flags & GENHD_FL_EXT_DEVT)
240 return DISK_MAX_PARTS;
241 return disk->minors;
242 }
243
disk_part_scan_enabled(struct gendisk * disk)244 static inline bool disk_part_scan_enabled(struct gendisk *disk)
245 {
246 return disk_max_parts(disk) > 1 &&
247 !(disk->flags & GENHD_FL_NO_PART_SCAN);
248 }
249
disk_devt(struct gendisk * disk)250 static inline dev_t disk_devt(struct gendisk *disk)
251 {
252 return disk_to_dev(disk)->devt;
253 }
254
part_devt(struct hd_struct * part)255 static inline dev_t part_devt(struct hd_struct *part)
256 {
257 return part_to_dev(part)->devt;
258 }
259
260 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
261
disk_put_part(struct hd_struct * part)262 static inline void disk_put_part(struct hd_struct *part)
263 {
264 if (likely(part))
265 put_device(part_to_dev(part));
266 }
267
268 /*
269 * Smarter partition iterator without context limits.
270 */
271 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
272 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
273 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
274 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
275
276 struct disk_part_iter {
277 struct gendisk *disk;
278 struct hd_struct *part;
279 int idx;
280 unsigned int flags;
281 };
282
283 extern void disk_part_iter_init(struct disk_part_iter *piter,
284 struct gendisk *disk, unsigned int flags);
285 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
286 extern void disk_part_iter_exit(struct disk_part_iter *piter);
287
288 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
289 sector_t sector);
290
291 /*
292 * Macros to operate on percpu disk statistics:
293 *
294 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
295 * and should be called between disk_stat_lock() and
296 * disk_stat_unlock().
297 *
298 * part_stat_read() can be called at any time.
299 *
300 * part_stat_{add|set_all}() and {init|free}_part_stats are for
301 * internal use only.
302 */
303 #ifdef CONFIG_SMP
304 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
305 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
306
307 #define __part_stat_add(cpu, part, field, addnd) \
308 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
309
310 #define part_stat_read(part, field) \
311 ({ \
312 typeof((part)->dkstats->field) res = 0; \
313 unsigned int _cpu; \
314 for_each_possible_cpu(_cpu) \
315 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
316 res; \
317 })
318
part_stat_set_all(struct hd_struct * part,int value)319 static inline void part_stat_set_all(struct hd_struct *part, int value)
320 {
321 int i;
322
323 for_each_possible_cpu(i)
324 memset(per_cpu_ptr(part->dkstats, i), value,
325 sizeof(struct disk_stats));
326 }
327
init_part_stats(struct hd_struct * part)328 static inline int init_part_stats(struct hd_struct *part)
329 {
330 part->dkstats = alloc_percpu(struct disk_stats);
331 if (!part->dkstats)
332 return 0;
333 return 1;
334 }
335
free_part_stats(struct hd_struct * part)336 static inline void free_part_stats(struct hd_struct *part)
337 {
338 free_percpu(part->dkstats);
339 }
340
341 #else /* !CONFIG_SMP */
342 #define part_stat_lock() ({ rcu_read_lock(); 0; })
343 #define part_stat_unlock() rcu_read_unlock()
344
345 #define __part_stat_add(cpu, part, field, addnd) \
346 ((part)->dkstats.field += addnd)
347
348 #define part_stat_read(part, field) ((part)->dkstats.field)
349
part_stat_set_all(struct hd_struct * part,int value)350 static inline void part_stat_set_all(struct hd_struct *part, int value)
351 {
352 memset(&part->dkstats, value, sizeof(struct disk_stats));
353 }
354
init_part_stats(struct hd_struct * part)355 static inline int init_part_stats(struct hd_struct *part)
356 {
357 return 1;
358 }
359
free_part_stats(struct hd_struct * part)360 static inline void free_part_stats(struct hd_struct *part)
361 {
362 }
363
364 #endif /* CONFIG_SMP */
365
366 #define part_stat_add(cpu, part, field, addnd) do { \
367 __part_stat_add((cpu), (part), field, addnd); \
368 if ((part)->partno) \
369 __part_stat_add((cpu), &part_to_disk((part))->part0, \
370 field, addnd); \
371 } while (0)
372
373 #define part_stat_dec(cpu, gendiskp, field) \
374 part_stat_add(cpu, gendiskp, field, -1)
375 #define part_stat_inc(cpu, gendiskp, field) \
376 part_stat_add(cpu, gendiskp, field, 1)
377 #define part_stat_sub(cpu, gendiskp, field, subnd) \
378 part_stat_add(cpu, gendiskp, field, -subnd)
379
part_inc_in_flight(struct hd_struct * part,int rw)380 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
381 {
382 atomic_inc(&part->in_flight[rw]);
383 if (part->partno)
384 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
385 }
386
part_dec_in_flight(struct hd_struct * part,int rw)387 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
388 {
389 atomic_dec(&part->in_flight[rw]);
390 if (part->partno)
391 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
392 }
393
part_in_flight(struct hd_struct * part)394 static inline int part_in_flight(struct hd_struct *part)
395 {
396 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
397 }
398
alloc_part_info(struct gendisk * disk)399 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
400 {
401 if (disk)
402 return kzalloc_node(sizeof(struct partition_meta_info),
403 GFP_KERNEL, disk->node_id);
404 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
405 }
406
free_part_info(struct hd_struct * part)407 static inline void free_part_info(struct hd_struct *part)
408 {
409 kfree(part->info);
410 }
411
412 /* block/blk-core.c */
413 extern void part_round_stats(int cpu, struct hd_struct *part);
414
415 /* block/genhd.c */
416 extern void device_add_disk(struct device *parent, struct gendisk *disk);
add_disk(struct gendisk * disk)417 static inline void add_disk(struct gendisk *disk)
418 {
419 device_add_disk(NULL, disk);
420 }
421
422 extern void del_gendisk(struct gendisk *gp);
423 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
424 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
425
426 extern void set_device_ro(struct block_device *bdev, int flag);
427 extern void set_disk_ro(struct gendisk *disk, int flag);
428
get_disk_ro(struct gendisk * disk)429 static inline int get_disk_ro(struct gendisk *disk)
430 {
431 return disk->part0.policy;
432 }
433
434 extern void disk_block_events(struct gendisk *disk);
435 extern void disk_unblock_events(struct gendisk *disk);
436 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
437 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
438
439 /* drivers/char/random.c */
440 extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
441 extern void rand_initialize_disk(struct gendisk *disk);
442
get_start_sect(struct block_device * bdev)443 static inline sector_t get_start_sect(struct block_device *bdev)
444 {
445 return bdev->bd_part->start_sect;
446 }
get_capacity(struct gendisk * disk)447 static inline sector_t get_capacity(struct gendisk *disk)
448 {
449 return disk->part0.nr_sects;
450 }
set_capacity(struct gendisk * disk,sector_t size)451 static inline void set_capacity(struct gendisk *disk, sector_t size)
452 {
453 disk->part0.nr_sects = size;
454 }
455
456 #ifdef CONFIG_SOLARIS_X86_PARTITION
457
458 #define SOLARIS_X86_NUMSLICE 16
459 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
460
461 struct solaris_x86_slice {
462 __le16 s_tag; /* ID tag of partition */
463 __le16 s_flag; /* permission flags */
464 __le32 s_start; /* start sector no of partition */
465 __le32 s_size; /* # of blocks in partition */
466 };
467
468 struct solaris_x86_vtoc {
469 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
470 __le32 v_sanity; /* to verify vtoc sanity */
471 __le32 v_version; /* layout version */
472 char v_volume[8]; /* volume name */
473 __le16 v_sectorsz; /* sector size in bytes */
474 __le16 v_nparts; /* number of partitions */
475 unsigned int v_reserved[10]; /* free space */
476 struct solaris_x86_slice
477 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
478 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
479 char v_asciilabel[128]; /* for compatibility */
480 };
481
482 #endif /* CONFIG_SOLARIS_X86_PARTITION */
483
484 #ifdef CONFIG_BSD_DISKLABEL
485 /*
486 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
487 * updated by Marc Espie <Marc.Espie@openbsd.org>
488 */
489
490 /* check against BSD src/sys/sys/disklabel.h for consistency */
491
492 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
493 #define BSD_MAXPARTITIONS 16
494 #define OPENBSD_MAXPARTITIONS 16
495 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
496 struct bsd_disklabel {
497 __le32 d_magic; /* the magic number */
498 __s16 d_type; /* drive type */
499 __s16 d_subtype; /* controller/d_type specific */
500 char d_typename[16]; /* type name, e.g. "eagle" */
501 char d_packname[16]; /* pack identifier */
502 __u32 d_secsize; /* # of bytes per sector */
503 __u32 d_nsectors; /* # of data sectors per track */
504 __u32 d_ntracks; /* # of tracks per cylinder */
505 __u32 d_ncylinders; /* # of data cylinders per unit */
506 __u32 d_secpercyl; /* # of data sectors per cylinder */
507 __u32 d_secperunit; /* # of data sectors per unit */
508 __u16 d_sparespertrack; /* # of spare sectors per track */
509 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
510 __u32 d_acylinders; /* # of alt. cylinders per unit */
511 __u16 d_rpm; /* rotational speed */
512 __u16 d_interleave; /* hardware sector interleave */
513 __u16 d_trackskew; /* sector 0 skew, per track */
514 __u16 d_cylskew; /* sector 0 skew, per cylinder */
515 __u32 d_headswitch; /* head switch time, usec */
516 __u32 d_trkseek; /* track-to-track seek, usec */
517 __u32 d_flags; /* generic flags */
518 #define NDDATA 5
519 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
520 #define NSPARE 5
521 __u32 d_spare[NSPARE]; /* reserved for future use */
522 __le32 d_magic2; /* the magic number (again) */
523 __le16 d_checksum; /* xor of data incl. partitions */
524
525 /* filesystem and partition information: */
526 __le16 d_npartitions; /* number of partitions in following */
527 __le32 d_bbsize; /* size of boot area at sn0, bytes */
528 __le32 d_sbsize; /* max size of fs superblock, bytes */
529 struct bsd_partition { /* the partition table */
530 __le32 p_size; /* number of sectors in partition */
531 __le32 p_offset; /* starting sector */
532 __le32 p_fsize; /* filesystem basic fragment size */
533 __u8 p_fstype; /* filesystem type, see below */
534 __u8 p_frag; /* filesystem fragments per block */
535 __le16 p_cpg; /* filesystem cylinders per group */
536 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
537 };
538
539 #endif /* CONFIG_BSD_DISKLABEL */
540
541 #ifdef CONFIG_UNIXWARE_DISKLABEL
542 /*
543 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
544 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
545 */
546
547 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
548 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
549 #define UNIXWARE_NUMSLICE 16
550 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
551
552 struct unixware_slice {
553 __le16 s_label; /* label */
554 __le16 s_flags; /* permission flags */
555 __le32 start_sect; /* starting sector */
556 __le32 nr_sects; /* number of sectors in slice */
557 };
558
559 struct unixware_disklabel {
560 __le32 d_type; /* drive type */
561 __le32 d_magic; /* the magic number */
562 __le32 d_version; /* version number */
563 char d_serial[12]; /* serial number of the device */
564 __le32 d_ncylinders; /* # of data cylinders per device */
565 __le32 d_ntracks; /* # of tracks per cylinder */
566 __le32 d_nsectors; /* # of data sectors per track */
567 __le32 d_secsize; /* # of bytes per sector */
568 __le32 d_part_start; /* # of first sector of this partition */
569 __le32 d_unknown1[12]; /* ? */
570 __le32 d_alt_tbl; /* byte offset of alternate table */
571 __le32 d_alt_len; /* byte length of alternate table */
572 __le32 d_phys_cyl; /* # of physical cylinders per device */
573 __le32 d_phys_trk; /* # of physical tracks per cylinder */
574 __le32 d_phys_sec; /* # of physical sectors per track */
575 __le32 d_phys_bytes; /* # of physical bytes per sector */
576 __le32 d_unknown2; /* ? */
577 __le32 d_unknown3; /* ? */
578 __le32 d_pad[8]; /* pad */
579
580 struct unixware_vtoc {
581 __le32 v_magic; /* the magic number */
582 __le32 v_version; /* version number */
583 char v_name[8]; /* volume name */
584 __le16 v_nslices; /* # of slices */
585 __le16 v_unknown1; /* ? */
586 __le32 v_reserved[10]; /* reserved */
587 struct unixware_slice
588 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
589 } vtoc;
590
591 }; /* 408 */
592
593 #endif /* CONFIG_UNIXWARE_DISKLABEL */
594
595 #ifdef CONFIG_MINIX_SUBPARTITION
596 # define MINIX_NR_SUBPARTITIONS 4
597 #endif /* CONFIG_MINIX_SUBPARTITION */
598
599 #define ADDPART_FLAG_NONE 0
600 #define ADDPART_FLAG_RAID 1
601 #define ADDPART_FLAG_WHOLEDISK 2
602
603 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
604 extern void blk_free_devt(dev_t devt);
605 extern dev_t blk_lookup_devt(const char *name, int partno);
606 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
607
608 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
609 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
610 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
611 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
612 int partno, sector_t start,
613 sector_t len, int flags,
614 struct partition_meta_info
615 *info);
616 extern void __delete_partition(struct percpu_ref *);
617 extern void delete_partition(struct gendisk *, int);
618 extern void printk_all_partitions(void);
619
620 extern struct gendisk *alloc_disk_node(int minors, int node_id);
621 extern struct gendisk *alloc_disk(int minors);
622 extern struct kobject *get_disk(struct gendisk *disk);
623 extern void put_disk(struct gendisk *disk);
624 extern void blk_register_region(dev_t devt, unsigned long range,
625 struct module *module,
626 struct kobject *(*probe)(dev_t, int *, void *),
627 int (*lock)(dev_t, void *),
628 void *data);
629 extern void blk_unregister_region(dev_t devt, unsigned long range);
630
631 extern ssize_t part_size_show(struct device *dev,
632 struct device_attribute *attr, char *buf);
633 extern ssize_t part_stat_show(struct device *dev,
634 struct device_attribute *attr, char *buf);
635 extern ssize_t part_inflight_show(struct device *dev,
636 struct device_attribute *attr, char *buf);
637 #ifdef CONFIG_FAIL_MAKE_REQUEST
638 extern ssize_t part_fail_show(struct device *dev,
639 struct device_attribute *attr, char *buf);
640 extern ssize_t part_fail_store(struct device *dev,
641 struct device_attribute *attr,
642 const char *buf, size_t count);
643 #endif /* CONFIG_FAIL_MAKE_REQUEST */
644
hd_ref_init(struct hd_struct * part)645 static inline int hd_ref_init(struct hd_struct *part)
646 {
647 if (percpu_ref_init(&part->ref, __delete_partition, 0,
648 GFP_KERNEL))
649 return -ENOMEM;
650 return 0;
651 }
652
hd_struct_get(struct hd_struct * part)653 static inline void hd_struct_get(struct hd_struct *part)
654 {
655 percpu_ref_get(&part->ref);
656 }
657
hd_struct_try_get(struct hd_struct * part)658 static inline int hd_struct_try_get(struct hd_struct *part)
659 {
660 return percpu_ref_tryget_live(&part->ref);
661 }
662
hd_struct_put(struct hd_struct * part)663 static inline void hd_struct_put(struct hd_struct *part)
664 {
665 percpu_ref_put(&part->ref);
666 }
667
hd_struct_kill(struct hd_struct * part)668 static inline void hd_struct_kill(struct hd_struct *part)
669 {
670 percpu_ref_kill(&part->ref);
671 }
672
hd_free_part(struct hd_struct * part)673 static inline void hd_free_part(struct hd_struct *part)
674 {
675 free_part_stats(part);
676 free_part_info(part);
677 percpu_ref_exit(&part->ref);
678 }
679
680 /*
681 * Any access of part->nr_sects which is not protected by partition
682 * bd_mutex or gendisk bdev bd_mutex, should be done using this
683 * accessor function.
684 *
685 * Code written along the lines of i_size_read() and i_size_write().
686 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
687 * on.
688 */
part_nr_sects_read(struct hd_struct * part)689 static inline sector_t part_nr_sects_read(struct hd_struct *part)
690 {
691 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
692 sector_t nr_sects;
693 unsigned seq;
694 do {
695 seq = read_seqcount_begin(&part->nr_sects_seq);
696 nr_sects = part->nr_sects;
697 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
698 return nr_sects;
699 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
700 sector_t nr_sects;
701
702 preempt_disable();
703 nr_sects = part->nr_sects;
704 preempt_enable();
705 return nr_sects;
706 #else
707 return part->nr_sects;
708 #endif
709 }
710
711 /*
712 * Should be called with mutex lock held (typically bd_mutex) of partition
713 * to provide mutual exlusion among writers otherwise seqcount might be
714 * left in wrong state leaving the readers spinning infinitely.
715 */
part_nr_sects_write(struct hd_struct * part,sector_t size)716 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
717 {
718 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
719 write_seqcount_begin(&part->nr_sects_seq);
720 part->nr_sects = size;
721 write_seqcount_end(&part->nr_sects_seq);
722 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
723 preempt_disable();
724 part->nr_sects = size;
725 preempt_enable();
726 #else
727 part->nr_sects = size;
728 #endif
729 }
730
731 #if defined(CONFIG_BLK_DEV_INTEGRITY)
732 extern void blk_integrity_add(struct gendisk *);
733 extern void blk_integrity_del(struct gendisk *);
734 #else /* CONFIG_BLK_DEV_INTEGRITY */
blk_integrity_add(struct gendisk * disk)735 static inline void blk_integrity_add(struct gendisk *disk) { }
blk_integrity_del(struct gendisk * disk)736 static inline void blk_integrity_del(struct gendisk *disk) { }
737 #endif /* CONFIG_BLK_DEV_INTEGRITY */
738
739 #else /* CONFIG_BLOCK */
740
printk_all_partitions(void)741 static inline void printk_all_partitions(void) { }
742
blk_lookup_devt(const char * name,int partno)743 static inline dev_t blk_lookup_devt(const char *name, int partno)
744 {
745 dev_t devt = MKDEV(0, 0);
746 return devt;
747 }
748
blk_part_pack_uuid(const u8 * uuid_str,u8 * to)749 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
750 {
751 return -EINVAL;
752 }
753 #endif /* CONFIG_BLOCK */
754
755 #endif /* _LINUX_GENHD_H */
756