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
144 #define GENHD_FL_HIDDEN 1024
147 DISK_EVENT_MEDIA_CHANGE
= 1 << 0, /* media changed */
148 DISK_EVENT_EJECT_REQUEST
= 1 << 1, /* eject requested */
151 struct disk_part_tbl
{
152 struct rcu_head rcu_head
;
154 struct hd_struct __rcu
*last_lookup
;
155 struct hd_struct __rcu
*part
[];
161 #if defined(CONFIG_BLK_DEV_INTEGRITY)
163 struct blk_integrity
{
164 const struct blk_integrity_profile
*profile
;
166 unsigned char tuple_size
;
167 unsigned char interval_exp
;
168 unsigned char tag_size
;
171 #endif /* CONFIG_BLK_DEV_INTEGRITY */
174 /* major, first_minor and minors are input parameters only,
175 * don't use directly. Use disk_devt() and disk_max_parts().
177 int major
; /* major number of driver */
179 int minors
; /* maximum number of minors, =1 for
180 * disks that can't be partitioned. */
182 char disk_name
[DISK_NAME_LEN
]; /* name of major driver */
183 char *(*devnode
)(struct gendisk
*gd
, umode_t
*mode
);
185 unsigned int events
; /* supported events */
186 unsigned int async_events
; /* async events, subset of all */
188 /* Array of pointers to partitions indexed by partno.
189 * Protected with matching bdev lock but stat and other
190 * non-critical accesses use RCU. Always access through
193 struct disk_part_tbl __rcu
*part_tbl
;
194 struct hd_struct part0
;
196 const struct block_device_operations
*fops
;
197 struct request_queue
*queue
;
201 struct rw_semaphore lookup_sem
;
202 struct kobject
*slave_dir
;
204 struct timer_rand_state
*random
;
205 atomic_t sync_io
; /* RAID */
206 struct disk_events
*ev
;
207 #ifdef CONFIG_BLK_DEV_INTEGRITY
208 struct kobject integrity_kobj
;
209 #endif /* CONFIG_BLK_DEV_INTEGRITY */
211 struct badblocks
*bb
;
212 struct lockdep_map lockdep_map
;
215 static inline struct gendisk
*part_to_disk(struct hd_struct
*part
)
219 return dev_to_disk(part_to_dev(part
)->parent
);
221 return dev_to_disk(part_to_dev(part
));
226 static inline int disk_max_parts(struct gendisk
*disk
)
228 if (disk
->flags
& GENHD_FL_EXT_DEVT
)
229 return DISK_MAX_PARTS
;
233 static inline bool disk_part_scan_enabled(struct gendisk
*disk
)
235 return disk_max_parts(disk
) > 1 &&
236 !(disk
->flags
& GENHD_FL_NO_PART_SCAN
);
239 static inline dev_t
disk_devt(struct gendisk
*disk
)
241 return MKDEV(disk
->major
, disk
->first_minor
);
244 static inline dev_t
part_devt(struct hd_struct
*part
)
246 return part_to_dev(part
)->devt
;
249 extern struct hd_struct
*__disk_get_part(struct gendisk
*disk
, int partno
);
250 extern struct hd_struct
*disk_get_part(struct gendisk
*disk
, int partno
);
252 static inline void disk_put_part(struct hd_struct
*part
)
255 put_device(part_to_dev(part
));
259 * Smarter partition iterator without context limits.
261 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
262 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
263 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
264 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
266 struct disk_part_iter
{
267 struct gendisk
*disk
;
268 struct hd_struct
*part
;
273 extern void disk_part_iter_init(struct disk_part_iter
*piter
,
274 struct gendisk
*disk
, unsigned int flags
);
275 extern struct hd_struct
*disk_part_iter_next(struct disk_part_iter
*piter
);
276 extern void disk_part_iter_exit(struct disk_part_iter
*piter
);
278 extern struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
,
282 * Macros to operate on percpu disk statistics:
284 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
285 * and should be called between disk_stat_lock() and
286 * disk_stat_unlock().
288 * part_stat_read() can be called at any time.
290 * part_stat_{add|set_all}() and {init|free}_part_stats are for
294 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
295 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
297 #define __part_stat_add(cpu, part, field, addnd) \
298 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
300 #define part_stat_read(part, field) \
302 typeof((part)->dkstats->field) res = 0; \
304 for_each_possible_cpu(_cpu) \
305 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
309 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
313 for_each_possible_cpu(i
)
314 memset(per_cpu_ptr(part
->dkstats
, i
), value
,
315 sizeof(struct disk_stats
));
318 static inline int init_part_stats(struct hd_struct
*part
)
320 part
->dkstats
= alloc_percpu(struct disk_stats
);
326 static inline void free_part_stats(struct hd_struct
*part
)
328 free_percpu(part
->dkstats
);
331 #else /* !CONFIG_SMP */
332 #define part_stat_lock() ({ rcu_read_lock(); 0; })
333 #define part_stat_unlock() rcu_read_unlock()
335 #define __part_stat_add(cpu, part, field, addnd) \
336 ((part)->dkstats.field += addnd)
338 #define part_stat_read(part, field) ((part)->dkstats.field)
340 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
342 memset(&part
->dkstats
, value
, sizeof(struct disk_stats
));
345 static inline int init_part_stats(struct hd_struct
*part
)
350 static inline void free_part_stats(struct hd_struct
*part
)
354 #endif /* CONFIG_SMP */
356 #define part_stat_add(cpu, part, field, addnd) do { \
357 __part_stat_add((cpu), (part), field, addnd); \
358 if ((part)->partno) \
359 __part_stat_add((cpu), &part_to_disk((part))->part0, \
363 #define part_stat_dec(cpu, gendiskp, field) \
364 part_stat_add(cpu, gendiskp, field, -1)
365 #define part_stat_inc(cpu, gendiskp, field) \
366 part_stat_add(cpu, gendiskp, field, 1)
367 #define part_stat_sub(cpu, gendiskp, field, subnd) \
368 part_stat_add(cpu, gendiskp, field, -subnd)
370 void part_in_flight(struct request_queue
*q
, struct hd_struct
*part
,
371 unsigned int inflight
[2]);
372 void part_in_flight_rw(struct request_queue
*q
, struct hd_struct
*part
,
373 unsigned int inflight
[2]);
374 void part_dec_in_flight(struct request_queue
*q
, struct hd_struct
*part
,
376 void part_inc_in_flight(struct request_queue
*q
, struct hd_struct
*part
,
379 static inline struct partition_meta_info
*alloc_part_info(struct gendisk
*disk
)
382 return kzalloc_node(sizeof(struct partition_meta_info
),
383 GFP_KERNEL
, disk
->node_id
);
384 return kzalloc(sizeof(struct partition_meta_info
), GFP_KERNEL
);
387 static inline void free_part_info(struct hd_struct
*part
)
392 /* block/blk-core.c */
393 extern void part_round_stats(struct request_queue
*q
, int cpu
, struct hd_struct
*part
);
396 extern void device_add_disk(struct device
*parent
, struct gendisk
*disk
);
397 static inline void add_disk(struct gendisk
*disk
)
399 device_add_disk(NULL
, disk
);
401 extern void device_add_disk_no_queue_reg(struct device
*parent
, struct gendisk
*disk
);
402 static inline void add_disk_no_queue_reg(struct gendisk
*disk
)
404 device_add_disk_no_queue_reg(NULL
, disk
);
407 extern void del_gendisk(struct gendisk
*gp
);
408 extern struct gendisk
*get_gendisk(dev_t dev
, int *partno
);
409 extern struct block_device
*bdget_disk(struct gendisk
*disk
, int partno
);
411 extern void set_device_ro(struct block_device
*bdev
, int flag
);
412 extern void set_disk_ro(struct gendisk
*disk
, int flag
);
414 static inline int get_disk_ro(struct gendisk
*disk
)
416 return disk
->part0
.policy
;
419 extern void disk_block_events(struct gendisk
*disk
);
420 extern void disk_unblock_events(struct gendisk
*disk
);
421 extern void disk_flush_events(struct gendisk
*disk
, unsigned int mask
);
422 extern unsigned int disk_clear_events(struct gendisk
*disk
, unsigned int mask
);
424 /* drivers/char/random.c */
425 extern void add_disk_randomness(struct gendisk
*disk
) __latent_entropy
;
426 extern void rand_initialize_disk(struct gendisk
*disk
);
428 static inline sector_t
get_start_sect(struct block_device
*bdev
)
430 return bdev
->bd_part
->start_sect
;
432 static inline sector_t
get_capacity(struct gendisk
*disk
)
434 return disk
->part0
.nr_sects
;
436 static inline void set_capacity(struct gendisk
*disk
, sector_t size
)
438 disk
->part0
.nr_sects
= size
;
441 #ifdef CONFIG_SOLARIS_X86_PARTITION
443 #define SOLARIS_X86_NUMSLICE 16
444 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
446 struct solaris_x86_slice
{
447 __le16 s_tag
; /* ID tag of partition */
448 __le16 s_flag
; /* permission flags */
449 __le32 s_start
; /* start sector no of partition */
450 __le32 s_size
; /* # of blocks in partition */
453 struct solaris_x86_vtoc
{
454 unsigned int v_bootinfo
[3]; /* info needed by mboot (unsupported) */
455 __le32 v_sanity
; /* to verify vtoc sanity */
456 __le32 v_version
; /* layout version */
457 char v_volume
[8]; /* volume name */
458 __le16 v_sectorsz
; /* sector size in bytes */
459 __le16 v_nparts
; /* number of partitions */
460 unsigned int v_reserved
[10]; /* free space */
461 struct solaris_x86_slice
462 v_slice
[SOLARIS_X86_NUMSLICE
]; /* slice headers */
463 unsigned int timestamp
[SOLARIS_X86_NUMSLICE
]; /* timestamp (unsupported) */
464 char v_asciilabel
[128]; /* for compatibility */
467 #endif /* CONFIG_SOLARIS_X86_PARTITION */
469 #ifdef CONFIG_BSD_DISKLABEL
471 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
472 * updated by Marc Espie <Marc.Espie@openbsd.org>
475 /* check against BSD src/sys/sys/disklabel.h for consistency */
477 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
478 #define BSD_MAXPARTITIONS 16
479 #define OPENBSD_MAXPARTITIONS 16
480 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
481 struct bsd_disklabel
{
482 __le32 d_magic
; /* the magic number */
483 __s16 d_type
; /* drive type */
484 __s16 d_subtype
; /* controller/d_type specific */
485 char d_typename
[16]; /* type name, e.g. "eagle" */
486 char d_packname
[16]; /* pack identifier */
487 __u32 d_secsize
; /* # of bytes per sector */
488 __u32 d_nsectors
; /* # of data sectors per track */
489 __u32 d_ntracks
; /* # of tracks per cylinder */
490 __u32 d_ncylinders
; /* # of data cylinders per unit */
491 __u32 d_secpercyl
; /* # of data sectors per cylinder */
492 __u32 d_secperunit
; /* # of data sectors per unit */
493 __u16 d_sparespertrack
; /* # of spare sectors per track */
494 __u16 d_sparespercyl
; /* # of spare sectors per cylinder */
495 __u32 d_acylinders
; /* # of alt. cylinders per unit */
496 __u16 d_rpm
; /* rotational speed */
497 __u16 d_interleave
; /* hardware sector interleave */
498 __u16 d_trackskew
; /* sector 0 skew, per track */
499 __u16 d_cylskew
; /* sector 0 skew, per cylinder */
500 __u32 d_headswitch
; /* head switch time, usec */
501 __u32 d_trkseek
; /* track-to-track seek, usec */
502 __u32 d_flags
; /* generic flags */
504 __u32 d_drivedata
[NDDATA
]; /* drive-type specific information */
506 __u32 d_spare
[NSPARE
]; /* reserved for future use */
507 __le32 d_magic2
; /* the magic number (again) */
508 __le16 d_checksum
; /* xor of data incl. partitions */
510 /* filesystem and partition information: */
511 __le16 d_npartitions
; /* number of partitions in following */
512 __le32 d_bbsize
; /* size of boot area at sn0, bytes */
513 __le32 d_sbsize
; /* max size of fs superblock, bytes */
514 struct bsd_partition
{ /* the partition table */
515 __le32 p_size
; /* number of sectors in partition */
516 __le32 p_offset
; /* starting sector */
517 __le32 p_fsize
; /* filesystem basic fragment size */
518 __u8 p_fstype
; /* filesystem type, see below */
519 __u8 p_frag
; /* filesystem fragments per block */
520 __le16 p_cpg
; /* filesystem cylinders per group */
521 } d_partitions
[BSD_MAXPARTITIONS
]; /* actually may be more */
524 #endif /* CONFIG_BSD_DISKLABEL */
526 #ifdef CONFIG_UNIXWARE_DISKLABEL
528 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
529 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
532 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
533 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
534 #define UNIXWARE_NUMSLICE 16
535 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
537 struct unixware_slice
{
538 __le16 s_label
; /* label */
539 __le16 s_flags
; /* permission flags */
540 __le32 start_sect
; /* starting sector */
541 __le32 nr_sects
; /* number of sectors in slice */
544 struct unixware_disklabel
{
545 __le32 d_type
; /* drive type */
546 __le32 d_magic
; /* the magic number */
547 __le32 d_version
; /* version number */
548 char d_serial
[12]; /* serial number of the device */
549 __le32 d_ncylinders
; /* # of data cylinders per device */
550 __le32 d_ntracks
; /* # of tracks per cylinder */
551 __le32 d_nsectors
; /* # of data sectors per track */
552 __le32 d_secsize
; /* # of bytes per sector */
553 __le32 d_part_start
; /* # of first sector of this partition */
554 __le32 d_unknown1
[12]; /* ? */
555 __le32 d_alt_tbl
; /* byte offset of alternate table */
556 __le32 d_alt_len
; /* byte length of alternate table */
557 __le32 d_phys_cyl
; /* # of physical cylinders per device */
558 __le32 d_phys_trk
; /* # of physical tracks per cylinder */
559 __le32 d_phys_sec
; /* # of physical sectors per track */
560 __le32 d_phys_bytes
; /* # of physical bytes per sector */
561 __le32 d_unknown2
; /* ? */
562 __le32 d_unknown3
; /* ? */
563 __le32 d_pad
[8]; /* pad */
565 struct unixware_vtoc
{
566 __le32 v_magic
; /* the magic number */
567 __le32 v_version
; /* version number */
568 char v_name
[8]; /* volume name */
569 __le16 v_nslices
; /* # of slices */
570 __le16 v_unknown1
; /* ? */
571 __le32 v_reserved
[10]; /* reserved */
572 struct unixware_slice
573 v_slice
[UNIXWARE_NUMSLICE
]; /* slice headers */
578 #endif /* CONFIG_UNIXWARE_DISKLABEL */
580 #ifdef CONFIG_MINIX_SUBPARTITION
581 # define MINIX_NR_SUBPARTITIONS 4
582 #endif /* CONFIG_MINIX_SUBPARTITION */
584 #define ADDPART_FLAG_NONE 0
585 #define ADDPART_FLAG_RAID 1
586 #define ADDPART_FLAG_WHOLEDISK 2
588 extern int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
);
589 extern void blk_free_devt(dev_t devt
);
590 extern dev_t
blk_lookup_devt(const char *name
, int partno
);
591 extern char *disk_name (struct gendisk
*hd
, int partno
, char *buf
);
593 extern int disk_expand_part_tbl(struct gendisk
*disk
, int target
);
594 extern int rescan_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
595 extern int invalidate_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
596 extern struct hd_struct
* __must_check
add_partition(struct gendisk
*disk
,
597 int partno
, sector_t start
,
598 sector_t len
, int flags
,
599 struct partition_meta_info
601 extern void __delete_partition(struct percpu_ref
*);
602 extern void delete_partition(struct gendisk
*, int);
603 extern void printk_all_partitions(void);
605 extern struct gendisk
*__alloc_disk_node(int minors
, int node_id
);
606 extern struct kobject
*get_disk_and_module(struct gendisk
*disk
);
607 extern void put_disk(struct gendisk
*disk
);
608 extern void put_disk_and_module(struct gendisk
*disk
);
609 extern void blk_register_region(dev_t devt
, unsigned long range
,
610 struct module
*module
,
611 struct kobject
*(*probe
)(dev_t
, int *, void *),
612 int (*lock
)(dev_t
, void *),
614 extern void blk_unregister_region(dev_t devt
, unsigned long range
);
616 extern ssize_t
part_size_show(struct device
*dev
,
617 struct device_attribute
*attr
, char *buf
);
618 extern ssize_t
part_stat_show(struct device
*dev
,
619 struct device_attribute
*attr
, char *buf
);
620 extern ssize_t
part_inflight_show(struct device
*dev
,
621 struct device_attribute
*attr
, char *buf
);
622 #ifdef CONFIG_FAIL_MAKE_REQUEST
623 extern ssize_t
part_fail_show(struct device
*dev
,
624 struct device_attribute
*attr
, char *buf
);
625 extern ssize_t
part_fail_store(struct device
*dev
,
626 struct device_attribute
*attr
,
627 const char *buf
, size_t count
);
628 #endif /* CONFIG_FAIL_MAKE_REQUEST */
630 #define alloc_disk_node(minors, node_id) \
632 static struct lock_class_key __key; \
633 const char *__name; \
634 struct gendisk *__disk; \
636 __name = "(gendisk_completion)"#minors"("#node_id")"; \
638 __disk = __alloc_disk_node(minors, node_id); \
641 lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
646 #define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
648 static inline int hd_ref_init(struct hd_struct
*part
)
650 if (percpu_ref_init(&part
->ref
, __delete_partition
, 0,
656 static inline void hd_struct_get(struct hd_struct
*part
)
658 percpu_ref_get(&part
->ref
);
661 static inline int hd_struct_try_get(struct hd_struct
*part
)
663 return percpu_ref_tryget_live(&part
->ref
);
666 static inline void hd_struct_put(struct hd_struct
*part
)
668 percpu_ref_put(&part
->ref
);
671 static inline void hd_struct_kill(struct hd_struct
*part
)
673 percpu_ref_kill(&part
->ref
);
676 static inline void hd_free_part(struct hd_struct
*part
)
678 free_part_stats(part
);
679 free_part_info(part
);
680 percpu_ref_exit(&part
->ref
);
684 * Any access of part->nr_sects which is not protected by partition
685 * bd_mutex or gendisk bdev bd_mutex, should be done using this
688 * Code written along the lines of i_size_read() and i_size_write().
689 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
692 static inline sector_t
part_nr_sects_read(struct hd_struct
*part
)
694 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
698 seq
= read_seqcount_begin(&part
->nr_sects_seq
);
699 nr_sects
= part
->nr_sects
;
700 } while (read_seqcount_retry(&part
->nr_sects_seq
, seq
));
702 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
706 nr_sects
= part
->nr_sects
;
710 return part
->nr_sects
;
715 * Should be called with mutex lock held (typically bd_mutex) of partition
716 * to provide mutual exlusion among writers otherwise seqcount might be
717 * left in wrong state leaving the readers spinning infinitely.
719 static inline void part_nr_sects_write(struct hd_struct
*part
, sector_t size
)
721 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
722 write_seqcount_begin(&part
->nr_sects_seq
);
723 part
->nr_sects
= size
;
724 write_seqcount_end(&part
->nr_sects_seq
);
725 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
727 part
->nr_sects
= size
;
730 part
->nr_sects
= size
;
734 #if defined(CONFIG_BLK_DEV_INTEGRITY)
735 extern void blk_integrity_add(struct gendisk
*);
736 extern void blk_integrity_del(struct gendisk
*);
737 #else /* CONFIG_BLK_DEV_INTEGRITY */
738 static inline void blk_integrity_add(struct gendisk
*disk
) { }
739 static inline void blk_integrity_del(struct gendisk
*disk
) { }
740 #endif /* CONFIG_BLK_DEV_INTEGRITY */
742 #else /* CONFIG_BLOCK */
744 static inline void printk_all_partitions(void) { }
746 static inline dev_t
blk_lookup_devt(const char *name
, int partno
)
748 dev_t devt
= MKDEV(0, 0);
751 #endif /* CONFIG_BLOCK */
753 #endif /* _LINUX_GENHD_H */