1 /* SPDX-License-Identifier: GPL-2.0 */
6 * genhd.h Copyright (C) 1992 Drew Eckhardt
7 * Generic hard disk header file by
13 #include <linux/types.h>
14 #include <linux/kdev_t.h>
15 #include <linux/rcupdate.h>
16 #include <linux/slab.h>
17 #include <linux/percpu-refcount.h>
18 #include <linux/uuid.h>
22 #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
23 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
24 #define disk_to_dev(disk) (&(disk)->part0.__dev)
25 #define part_to_dev(part) (&((part)->__dev))
27 extern struct device_type part_type
;
28 extern struct kobject
*block_depr
;
29 extern struct class block_class
;
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,
38 SUN_WHOLE_DISK
= DOS_EXTENDED_PARTITION
,
40 LINUX_SWAP_PARTITION
= 0x82,
41 LINUX_DATA_PARTITION
= 0x83,
42 LINUX_LVM_PARTITION
= 0x8e,
43 LINUX_RAID_PARTITION
= 0xfd, /* autodetect RAID partition */
45 SOLARIS_X86_PARTITION
= LINUX_SWAP_PARTITION
,
46 NEW_SOLARIS_X86_PARTITION
= 0xbf,
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 */
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 */
61 #define DISK_MAX_PARTS 256
62 #define DISK_NAME_LEN 32
64 #include <linux/major.h>
65 #include <linux/device.h>
66 #include <linux/smp.h>
67 #include <linux/string.h>
69 #include <linux/workqueue.h>
72 unsigned char boot_ind
; /* 0x80 - active */
73 unsigned char head
; /* starting head */
74 unsigned char sector
; /* starting sector */
75 unsigned char cyl
; /* starting cylinder */
76 unsigned char sys_ind
; /* What partition type */
77 unsigned char end_head
; /* end head */
78 unsigned char end_sector
; /* end sector */
79 unsigned char end_cyl
; /* end cylinder */
80 __le32 start_sect
; /* starting sector counting from 0 */
81 __le32 nr_sects
; /* nr of sectors in partition */
82 } __attribute__((packed
));
85 unsigned long sectors
[2]; /* READs and WRITEs */
87 unsigned long merges
[2];
88 unsigned long ticks
[2];
89 unsigned long io_ticks
;
90 unsigned long time_in_queue
;
93 #define PARTITION_META_INFO_VOLNAMELTH 64
95 * Enough for the string representation of any kind of UUID plus NULL.
96 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
98 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
100 struct partition_meta_info
{
101 char uuid
[PARTITION_META_INFO_UUIDLTH
];
102 u8 volname
[PARTITION_META_INFO_VOLNAMELTH
];
108 * nr_sects is protected by sequence counter. One might extend a
109 * partition while IO is happening to it and update of nr_sects
110 * can be non-atomic on 32bit machines with 64bit sector_t.
113 seqcount_t nr_sects_seq
;
114 sector_t alignment_offset
;
115 unsigned int discard_alignment
;
117 struct kobject
*holder_dir
;
119 struct partition_meta_info
*info
;
120 #ifdef CONFIG_FAIL_MAKE_REQUEST
124 atomic_t in_flight
[2];
126 struct disk_stats __percpu
*dkstats
;
128 struct disk_stats dkstats
;
130 struct percpu_ref ref
;
131 struct rcu_head rcu_head
;
134 #define GENHD_FL_REMOVABLE 1
136 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
137 #define GENHD_FL_CD 8
138 #define GENHD_FL_UP 16
139 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
140 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
141 #define GENHD_FL_NATIVE_CAPACITY 128
142 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
143 #define GENHD_FL_NO_PART_SCAN 512
146 DISK_EVENT_MEDIA_CHANGE
= 1 << 0, /* media changed */
147 DISK_EVENT_EJECT_REQUEST
= 1 << 1, /* eject requested */
150 struct disk_part_tbl
{
151 struct rcu_head rcu_head
;
153 struct hd_struct __rcu
*last_lookup
;
154 struct hd_struct __rcu
*part
[];
160 #if defined(CONFIG_BLK_DEV_INTEGRITY)
162 struct blk_integrity
{
163 const struct blk_integrity_profile
*profile
;
165 unsigned char tuple_size
;
166 unsigned char interval_exp
;
167 unsigned char tag_size
;
170 #endif /* CONFIG_BLK_DEV_INTEGRITY */
173 /* major, first_minor and minors are input parameters only,
174 * don't use directly. Use disk_devt() and disk_max_parts().
176 int major
; /* major number of driver */
178 int minors
; /* maximum number of minors, =1 for
179 * disks that can't be partitioned. */
181 char disk_name
[DISK_NAME_LEN
]; /* name of major driver */
182 char *(*devnode
)(struct gendisk
*gd
, umode_t
*mode
);
184 unsigned int events
; /* supported events */
185 unsigned int async_events
; /* async events, subset of all */
187 /* Array of pointers to partitions indexed by partno.
188 * Protected with matching bdev lock but stat and other
189 * non-critical accesses use RCU. Always access through
192 struct disk_part_tbl __rcu
*part_tbl
;
193 struct hd_struct part0
;
195 const struct block_device_operations
*fops
;
196 struct request_queue
*queue
;
200 struct kobject
*slave_dir
;
202 struct timer_rand_state
*random
;
203 atomic_t sync_io
; /* RAID */
204 struct disk_events
*ev
;
205 #ifdef CONFIG_BLK_DEV_INTEGRITY
206 struct kobject integrity_kobj
;
207 #endif /* CONFIG_BLK_DEV_INTEGRITY */
209 struct badblocks
*bb
;
212 static inline struct gendisk
*part_to_disk(struct hd_struct
*part
)
216 return dev_to_disk(part_to_dev(part
)->parent
);
218 return dev_to_disk(part_to_dev(part
));
223 static inline int disk_max_parts(struct gendisk
*disk
)
225 if (disk
->flags
& GENHD_FL_EXT_DEVT
)
226 return DISK_MAX_PARTS
;
230 static inline bool disk_part_scan_enabled(struct gendisk
*disk
)
232 return disk_max_parts(disk
) > 1 &&
233 !(disk
->flags
& GENHD_FL_NO_PART_SCAN
);
236 static inline dev_t
disk_devt(struct gendisk
*disk
)
238 return disk_to_dev(disk
)->devt
;
241 static inline dev_t
part_devt(struct hd_struct
*part
)
243 return part_to_dev(part
)->devt
;
246 extern struct hd_struct
*disk_get_part(struct gendisk
*disk
, int partno
);
248 static inline void disk_put_part(struct hd_struct
*part
)
251 put_device(part_to_dev(part
));
255 * Smarter partition iterator without context limits.
257 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
258 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
259 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
260 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
262 struct disk_part_iter
{
263 struct gendisk
*disk
;
264 struct hd_struct
*part
;
269 extern void disk_part_iter_init(struct disk_part_iter
*piter
,
270 struct gendisk
*disk
, unsigned int flags
);
271 extern struct hd_struct
*disk_part_iter_next(struct disk_part_iter
*piter
);
272 extern void disk_part_iter_exit(struct disk_part_iter
*piter
);
274 extern struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
,
278 * Macros to operate on percpu disk statistics:
280 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
281 * and should be called between disk_stat_lock() and
282 * disk_stat_unlock().
284 * part_stat_read() can be called at any time.
286 * part_stat_{add|set_all}() and {init|free}_part_stats are for
290 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
291 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
293 #define __part_stat_add(cpu, part, field, addnd) \
294 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
296 #define part_stat_read(part, field) \
298 typeof((part)->dkstats->field) res = 0; \
300 for_each_possible_cpu(_cpu) \
301 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
305 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
309 for_each_possible_cpu(i
)
310 memset(per_cpu_ptr(part
->dkstats
, i
), value
,
311 sizeof(struct disk_stats
));
314 static inline int init_part_stats(struct hd_struct
*part
)
316 part
->dkstats
= alloc_percpu(struct disk_stats
);
322 static inline void free_part_stats(struct hd_struct
*part
)
324 free_percpu(part
->dkstats
);
327 #else /* !CONFIG_SMP */
328 #define part_stat_lock() ({ rcu_read_lock(); 0; })
329 #define part_stat_unlock() rcu_read_unlock()
331 #define __part_stat_add(cpu, part, field, addnd) \
332 ((part)->dkstats.field += addnd)
334 #define part_stat_read(part, field) ((part)->dkstats.field)
336 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
338 memset(&part
->dkstats
, value
, sizeof(struct disk_stats
));
341 static inline int init_part_stats(struct hd_struct
*part
)
346 static inline void free_part_stats(struct hd_struct
*part
)
350 #endif /* CONFIG_SMP */
352 #define part_stat_add(cpu, part, field, addnd) do { \
353 __part_stat_add((cpu), (part), field, addnd); \
354 if ((part)->partno) \
355 __part_stat_add((cpu), &part_to_disk((part))->part0, \
359 #define part_stat_dec(cpu, gendiskp, field) \
360 part_stat_add(cpu, gendiskp, field, -1)
361 #define part_stat_inc(cpu, gendiskp, field) \
362 part_stat_add(cpu, gendiskp, field, 1)
363 #define part_stat_sub(cpu, gendiskp, field, subnd) \
364 part_stat_add(cpu, gendiskp, field, -subnd)
366 void part_in_flight(struct request_queue
*q
, struct hd_struct
*part
,
367 unsigned int inflight
[2]);
368 void part_dec_in_flight(struct request_queue
*q
, struct hd_struct
*part
,
370 void part_inc_in_flight(struct request_queue
*q
, struct hd_struct
*part
,
373 static inline struct partition_meta_info
*alloc_part_info(struct gendisk
*disk
)
376 return kzalloc_node(sizeof(struct partition_meta_info
),
377 GFP_KERNEL
, disk
->node_id
);
378 return kzalloc(sizeof(struct partition_meta_info
), GFP_KERNEL
);
381 static inline void free_part_info(struct hd_struct
*part
)
386 /* block/blk-core.c */
387 extern void part_round_stats(struct request_queue
*q
, int cpu
, struct hd_struct
*part
);
390 extern void device_add_disk(struct device
*parent
, struct gendisk
*disk
);
391 static inline void add_disk(struct gendisk
*disk
)
393 device_add_disk(NULL
, disk
);
396 extern void del_gendisk(struct gendisk
*gp
);
397 extern struct gendisk
*get_gendisk(dev_t dev
, int *partno
);
398 extern struct block_device
*bdget_disk(struct gendisk
*disk
, int partno
);
400 extern void set_device_ro(struct block_device
*bdev
, int flag
);
401 extern void set_disk_ro(struct gendisk
*disk
, int flag
);
403 static inline int get_disk_ro(struct gendisk
*disk
)
405 return disk
->part0
.policy
;
408 extern void disk_block_events(struct gendisk
*disk
);
409 extern void disk_unblock_events(struct gendisk
*disk
);
410 extern void disk_flush_events(struct gendisk
*disk
, unsigned int mask
);
411 extern unsigned int disk_clear_events(struct gendisk
*disk
, unsigned int mask
);
413 /* drivers/char/random.c */
414 extern void add_disk_randomness(struct gendisk
*disk
) __latent_entropy
;
415 extern void rand_initialize_disk(struct gendisk
*disk
);
417 static inline sector_t
get_start_sect(struct block_device
*bdev
)
419 return bdev
->bd_part
->start_sect
;
421 static inline sector_t
get_capacity(struct gendisk
*disk
)
423 return disk
->part0
.nr_sects
;
425 static inline void set_capacity(struct gendisk
*disk
, sector_t size
)
427 disk
->part0
.nr_sects
= size
;
430 #ifdef CONFIG_SOLARIS_X86_PARTITION
432 #define SOLARIS_X86_NUMSLICE 16
433 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
435 struct solaris_x86_slice
{
436 __le16 s_tag
; /* ID tag of partition */
437 __le16 s_flag
; /* permission flags */
438 __le32 s_start
; /* start sector no of partition */
439 __le32 s_size
; /* # of blocks in partition */
442 struct solaris_x86_vtoc
{
443 unsigned int v_bootinfo
[3]; /* info needed by mboot (unsupported) */
444 __le32 v_sanity
; /* to verify vtoc sanity */
445 __le32 v_version
; /* layout version */
446 char v_volume
[8]; /* volume name */
447 __le16 v_sectorsz
; /* sector size in bytes */
448 __le16 v_nparts
; /* number of partitions */
449 unsigned int v_reserved
[10]; /* free space */
450 struct solaris_x86_slice
451 v_slice
[SOLARIS_X86_NUMSLICE
]; /* slice headers */
452 unsigned int timestamp
[SOLARIS_X86_NUMSLICE
]; /* timestamp (unsupported) */
453 char v_asciilabel
[128]; /* for compatibility */
456 #endif /* CONFIG_SOLARIS_X86_PARTITION */
458 #ifdef CONFIG_BSD_DISKLABEL
460 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
461 * updated by Marc Espie <Marc.Espie@openbsd.org>
464 /* check against BSD src/sys/sys/disklabel.h for consistency */
466 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
467 #define BSD_MAXPARTITIONS 16
468 #define OPENBSD_MAXPARTITIONS 16
469 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
470 struct bsd_disklabel
{
471 __le32 d_magic
; /* the magic number */
472 __s16 d_type
; /* drive type */
473 __s16 d_subtype
; /* controller/d_type specific */
474 char d_typename
[16]; /* type name, e.g. "eagle" */
475 char d_packname
[16]; /* pack identifier */
476 __u32 d_secsize
; /* # of bytes per sector */
477 __u32 d_nsectors
; /* # of data sectors per track */
478 __u32 d_ntracks
; /* # of tracks per cylinder */
479 __u32 d_ncylinders
; /* # of data cylinders per unit */
480 __u32 d_secpercyl
; /* # of data sectors per cylinder */
481 __u32 d_secperunit
; /* # of data sectors per unit */
482 __u16 d_sparespertrack
; /* # of spare sectors per track */
483 __u16 d_sparespercyl
; /* # of spare sectors per cylinder */
484 __u32 d_acylinders
; /* # of alt. cylinders per unit */
485 __u16 d_rpm
; /* rotational speed */
486 __u16 d_interleave
; /* hardware sector interleave */
487 __u16 d_trackskew
; /* sector 0 skew, per track */
488 __u16 d_cylskew
; /* sector 0 skew, per cylinder */
489 __u32 d_headswitch
; /* head switch time, usec */
490 __u32 d_trkseek
; /* track-to-track seek, usec */
491 __u32 d_flags
; /* generic flags */
493 __u32 d_drivedata
[NDDATA
]; /* drive-type specific information */
495 __u32 d_spare
[NSPARE
]; /* reserved for future use */
496 __le32 d_magic2
; /* the magic number (again) */
497 __le16 d_checksum
; /* xor of data incl. partitions */
499 /* filesystem and partition information: */
500 __le16 d_npartitions
; /* number of partitions in following */
501 __le32 d_bbsize
; /* size of boot area at sn0, bytes */
502 __le32 d_sbsize
; /* max size of fs superblock, bytes */
503 struct bsd_partition
{ /* the partition table */
504 __le32 p_size
; /* number of sectors in partition */
505 __le32 p_offset
; /* starting sector */
506 __le32 p_fsize
; /* filesystem basic fragment size */
507 __u8 p_fstype
; /* filesystem type, see below */
508 __u8 p_frag
; /* filesystem fragments per block */
509 __le16 p_cpg
; /* filesystem cylinders per group */
510 } d_partitions
[BSD_MAXPARTITIONS
]; /* actually may be more */
513 #endif /* CONFIG_BSD_DISKLABEL */
515 #ifdef CONFIG_UNIXWARE_DISKLABEL
517 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
518 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
521 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
522 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
523 #define UNIXWARE_NUMSLICE 16
524 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
526 struct unixware_slice
{
527 __le16 s_label
; /* label */
528 __le16 s_flags
; /* permission flags */
529 __le32 start_sect
; /* starting sector */
530 __le32 nr_sects
; /* number of sectors in slice */
533 struct unixware_disklabel
{
534 __le32 d_type
; /* drive type */
535 __le32 d_magic
; /* the magic number */
536 __le32 d_version
; /* version number */
537 char d_serial
[12]; /* serial number of the device */
538 __le32 d_ncylinders
; /* # of data cylinders per device */
539 __le32 d_ntracks
; /* # of tracks per cylinder */
540 __le32 d_nsectors
; /* # of data sectors per track */
541 __le32 d_secsize
; /* # of bytes per sector */
542 __le32 d_part_start
; /* # of first sector of this partition */
543 __le32 d_unknown1
[12]; /* ? */
544 __le32 d_alt_tbl
; /* byte offset of alternate table */
545 __le32 d_alt_len
; /* byte length of alternate table */
546 __le32 d_phys_cyl
; /* # of physical cylinders per device */
547 __le32 d_phys_trk
; /* # of physical tracks per cylinder */
548 __le32 d_phys_sec
; /* # of physical sectors per track */
549 __le32 d_phys_bytes
; /* # of physical bytes per sector */
550 __le32 d_unknown2
; /* ? */
551 __le32 d_unknown3
; /* ? */
552 __le32 d_pad
[8]; /* pad */
554 struct unixware_vtoc
{
555 __le32 v_magic
; /* the magic number */
556 __le32 v_version
; /* version number */
557 char v_name
[8]; /* volume name */
558 __le16 v_nslices
; /* # of slices */
559 __le16 v_unknown1
; /* ? */
560 __le32 v_reserved
[10]; /* reserved */
561 struct unixware_slice
562 v_slice
[UNIXWARE_NUMSLICE
]; /* slice headers */
567 #endif /* CONFIG_UNIXWARE_DISKLABEL */
569 #ifdef CONFIG_MINIX_SUBPARTITION
570 # define MINIX_NR_SUBPARTITIONS 4
571 #endif /* CONFIG_MINIX_SUBPARTITION */
573 #define ADDPART_FLAG_NONE 0
574 #define ADDPART_FLAG_RAID 1
575 #define ADDPART_FLAG_WHOLEDISK 2
577 extern int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
);
578 extern void blk_free_devt(dev_t devt
);
579 extern dev_t
blk_lookup_devt(const char *name
, int partno
);
580 extern char *disk_name (struct gendisk
*hd
, int partno
, char *buf
);
582 extern int disk_expand_part_tbl(struct gendisk
*disk
, int target
);
583 extern int rescan_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
584 extern int invalidate_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
585 extern struct hd_struct
* __must_check
add_partition(struct gendisk
*disk
,
586 int partno
, sector_t start
,
587 sector_t len
, int flags
,
588 struct partition_meta_info
590 extern void __delete_partition(struct percpu_ref
*);
591 extern void delete_partition(struct gendisk
*, int);
592 extern void printk_all_partitions(void);
594 extern struct gendisk
*alloc_disk_node(int minors
, int node_id
);
595 extern struct gendisk
*alloc_disk(int minors
);
596 extern struct kobject
*get_disk(struct gendisk
*disk
);
597 extern void put_disk(struct gendisk
*disk
);
598 extern void blk_register_region(dev_t devt
, unsigned long range
,
599 struct module
*module
,
600 struct kobject
*(*probe
)(dev_t
, int *, void *),
601 int (*lock
)(dev_t
, void *),
603 extern void blk_unregister_region(dev_t devt
, unsigned long range
);
605 extern ssize_t
part_size_show(struct device
*dev
,
606 struct device_attribute
*attr
, char *buf
);
607 extern ssize_t
part_stat_show(struct device
*dev
,
608 struct device_attribute
*attr
, char *buf
);
609 extern ssize_t
part_inflight_show(struct device
*dev
,
610 struct device_attribute
*attr
, char *buf
);
611 #ifdef CONFIG_FAIL_MAKE_REQUEST
612 extern ssize_t
part_fail_show(struct device
*dev
,
613 struct device_attribute
*attr
, char *buf
);
614 extern ssize_t
part_fail_store(struct device
*dev
,
615 struct device_attribute
*attr
,
616 const char *buf
, size_t count
);
617 #endif /* CONFIG_FAIL_MAKE_REQUEST */
619 static inline int hd_ref_init(struct hd_struct
*part
)
621 if (percpu_ref_init(&part
->ref
, __delete_partition
, 0,
627 static inline void hd_struct_get(struct hd_struct
*part
)
629 percpu_ref_get(&part
->ref
);
632 static inline int hd_struct_try_get(struct hd_struct
*part
)
634 return percpu_ref_tryget_live(&part
->ref
);
637 static inline void hd_struct_put(struct hd_struct
*part
)
639 percpu_ref_put(&part
->ref
);
642 static inline void hd_struct_kill(struct hd_struct
*part
)
644 percpu_ref_kill(&part
->ref
);
647 static inline void hd_free_part(struct hd_struct
*part
)
649 free_part_stats(part
);
650 free_part_info(part
);
651 percpu_ref_exit(&part
->ref
);
655 * Any access of part->nr_sects which is not protected by partition
656 * bd_mutex or gendisk bdev bd_mutex, should be done using this
659 * Code written along the lines of i_size_read() and i_size_write().
660 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
663 static inline sector_t
part_nr_sects_read(struct hd_struct
*part
)
665 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
669 seq
= read_seqcount_begin(&part
->nr_sects_seq
);
670 nr_sects
= part
->nr_sects
;
671 } while (read_seqcount_retry(&part
->nr_sects_seq
, seq
));
673 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
677 nr_sects
= part
->nr_sects
;
681 return part
->nr_sects
;
686 * Should be called with mutex lock held (typically bd_mutex) of partition
687 * to provide mutual exlusion among writers otherwise seqcount might be
688 * left in wrong state leaving the readers spinning infinitely.
690 static inline void part_nr_sects_write(struct hd_struct
*part
, sector_t size
)
692 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
693 write_seqcount_begin(&part
->nr_sects_seq
);
694 part
->nr_sects
= size
;
695 write_seqcount_end(&part
->nr_sects_seq
);
696 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
698 part
->nr_sects
= size
;
701 part
->nr_sects
= size
;
705 #if defined(CONFIG_BLK_DEV_INTEGRITY)
706 extern void blk_integrity_add(struct gendisk
*);
707 extern void blk_integrity_del(struct gendisk
*);
708 #else /* CONFIG_BLK_DEV_INTEGRITY */
709 static inline void blk_integrity_add(struct gendisk
*disk
) { }
710 static inline void blk_integrity_del(struct gendisk
*disk
) { }
711 #endif /* CONFIG_BLK_DEV_INTEGRITY */
713 #else /* CONFIG_BLOCK */
715 static inline void printk_all_partitions(void) { }
717 static inline dev_t
blk_lookup_devt(const char *name
, int partno
)
719 dev_t devt
= MKDEV(0, 0);
722 #endif /* CONFIG_BLOCK */
724 #endif /* _LINUX_GENHD_H */