5 * genhd.h Copyright (C) 1992 Drew Eckhardt
6 * Generic hard disk header file by
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>
20 #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
21 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
22 #define disk_to_dev(disk) (&(disk)->part0.__dev)
23 #define part_to_dev(part) (&((part)->__dev))
25 extern struct device_type part_type
;
26 extern struct kobject
*block_depr
;
27 extern struct class block_class
;
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,
36 SUN_WHOLE_DISK
= DOS_EXTENDED_PARTITION
,
38 LINUX_SWAP_PARTITION
= 0x82,
39 LINUX_DATA_PARTITION
= 0x83,
40 LINUX_LVM_PARTITION
= 0x8e,
41 LINUX_RAID_PARTITION
= 0xfd, /* autodetect RAID partition */
43 SOLARIS_X86_PARTITION
= LINUX_SWAP_PARTITION
,
44 NEW_SOLARIS_X86_PARTITION
= 0xbf,
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 */
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 */
59 #define DISK_MAX_PARTS 256
60 #define DISK_NAME_LEN 32
62 #include <linux/major.h>
63 #include <linux/device.h>
64 #include <linux/smp.h>
65 #include <linux/string.h>
67 #include <linux/workqueue.h>
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
));
83 unsigned long sectors
[2]; /* READs and WRITEs */
85 unsigned long merges
[2];
86 unsigned long ticks
[2];
87 unsigned long io_ticks
;
88 unsigned long time_in_queue
;
91 #define PARTITION_META_INFO_VOLNAMELTH 64
93 * Enough for the string representation of any kind of UUID plus NULL.
94 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
96 #define PARTITION_META_INFO_UUIDLTH 37
98 struct partition_meta_info
{
99 char uuid
[PARTITION_META_INFO_UUIDLTH
];
100 u8 volname
[PARTITION_META_INFO_VOLNAMELTH
];
106 * nr_sects is protected by sequence counter. One might extend a
107 * partition while IO is happening to it and update of nr_sects
108 * can be non-atomic on 32bit machines with 64bit sector_t.
111 seqcount_t nr_sects_seq
;
112 sector_t alignment_offset
;
113 unsigned int discard_alignment
;
115 struct kobject
*holder_dir
;
117 struct partition_meta_info
*info
;
118 #ifdef CONFIG_FAIL_MAKE_REQUEST
122 atomic_t in_flight
[2];
124 struct disk_stats __percpu
*dkstats
;
126 struct disk_stats dkstats
;
128 struct percpu_ref ref
;
129 struct rcu_head rcu_head
;
132 #define GENHD_FL_REMOVABLE 1
134 #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
135 #define GENHD_FL_CD 8
136 #define GENHD_FL_UP 16
137 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
138 #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
139 #define GENHD_FL_NATIVE_CAPACITY 128
140 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
141 #define GENHD_FL_NO_PART_SCAN 512
144 DISK_EVENT_MEDIA_CHANGE
= 1 << 0, /* media changed */
145 DISK_EVENT_EJECT_REQUEST
= 1 << 1, /* eject requested */
148 #define BLK_SCSI_MAX_CMDS (256)
149 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
151 struct blk_scsi_cmd_filter
{
152 unsigned long read_ok
[BLK_SCSI_CMD_PER_LONG
];
153 unsigned long write_ok
[BLK_SCSI_CMD_PER_LONG
];
157 struct disk_part_tbl
{
158 struct rcu_head rcu_head
;
160 struct hd_struct __rcu
*last_lookup
;
161 struct hd_struct __rcu
*part
[];
166 #if defined(CONFIG_BLK_DEV_INTEGRITY)
168 struct blk_integrity
{
169 struct blk_integrity_profile
*profile
;
171 unsigned char tuple_size
;
172 unsigned char interval_exp
;
173 unsigned char tag_size
;
176 #endif /* CONFIG_BLK_DEV_INTEGRITY */
179 /* major, first_minor and minors are input parameters only,
180 * don't use directly. Use disk_devt() and disk_max_parts().
182 int major
; /* major number of driver */
184 int minors
; /* maximum number of minors, =1 for
185 * disks that can't be partitioned. */
187 char disk_name
[DISK_NAME_LEN
]; /* name of major driver */
188 char *(*devnode
)(struct gendisk
*gd
, umode_t
*mode
);
190 unsigned int events
; /* supported events */
191 unsigned int async_events
; /* async events, subset of all */
193 /* Array of pointers to partitions indexed by partno.
194 * Protected with matching bdev lock but stat and other
195 * non-critical accesses use RCU. Always access through
198 struct disk_part_tbl __rcu
*part_tbl
;
199 struct hd_struct part0
;
201 const struct block_device_operations
*fops
;
202 struct request_queue
*queue
;
206 struct device
*driverfs_dev
; // FIXME: remove
207 struct kobject
*slave_dir
;
209 struct timer_rand_state
*random
;
210 atomic_t sync_io
; /* RAID */
211 struct disk_events
*ev
;
212 #ifdef CONFIG_BLK_DEV_INTEGRITY
213 struct blk_integrity integrity
;
214 struct kobject integrity_kobj
;
215 #endif /* CONFIG_BLK_DEV_INTEGRITY */
219 static inline struct gendisk
*part_to_disk(struct hd_struct
*part
)
223 return dev_to_disk(part_to_dev(part
)->parent
);
225 return dev_to_disk(part_to_dev(part
));
230 static inline void part_pack_uuid(const u8
*uuid_str
, u8
*to
)
233 for (i
= 0; i
< 16; ++i
) {
234 *to
++ = (hex_to_bin(*uuid_str
) << 4) |
235 (hex_to_bin(*(uuid_str
+ 1)));
248 static inline int blk_part_pack_uuid(const u8
*uuid_str
, u8
*to
)
250 part_pack_uuid(uuid_str
, to
);
254 static inline int disk_max_parts(struct gendisk
*disk
)
256 if (disk
->flags
& GENHD_FL_EXT_DEVT
)
257 return DISK_MAX_PARTS
;
261 static inline bool disk_part_scan_enabled(struct gendisk
*disk
)
263 return disk_max_parts(disk
) > 1 &&
264 !(disk
->flags
& GENHD_FL_NO_PART_SCAN
);
267 static inline dev_t
disk_devt(struct gendisk
*disk
)
269 return disk_to_dev(disk
)->devt
;
272 static inline dev_t
part_devt(struct hd_struct
*part
)
274 return part_to_dev(part
)->devt
;
277 extern struct hd_struct
*disk_get_part(struct gendisk
*disk
, int partno
);
279 static inline void disk_put_part(struct hd_struct
*part
)
282 put_device(part_to_dev(part
));
286 * Smarter partition iterator without context limits.
288 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
289 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
290 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
291 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
293 struct disk_part_iter
{
294 struct gendisk
*disk
;
295 struct hd_struct
*part
;
300 extern void disk_part_iter_init(struct disk_part_iter
*piter
,
301 struct gendisk
*disk
, unsigned int flags
);
302 extern struct hd_struct
*disk_part_iter_next(struct disk_part_iter
*piter
);
303 extern void disk_part_iter_exit(struct disk_part_iter
*piter
);
305 extern struct hd_struct
*disk_map_sector_rcu(struct gendisk
*disk
,
309 * Macros to operate on percpu disk statistics:
311 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
312 * and should be called between disk_stat_lock() and
313 * disk_stat_unlock().
315 * part_stat_read() can be called at any time.
317 * part_stat_{add|set_all}() and {init|free}_part_stats are for
321 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
322 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
324 #define __part_stat_add(cpu, part, field, addnd) \
325 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
327 #define part_stat_read(part, field) \
329 typeof((part)->dkstats->field) res = 0; \
331 for_each_possible_cpu(_cpu) \
332 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
336 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
340 for_each_possible_cpu(i
)
341 memset(per_cpu_ptr(part
->dkstats
, i
), value
,
342 sizeof(struct disk_stats
));
345 static inline int init_part_stats(struct hd_struct
*part
)
347 part
->dkstats
= alloc_percpu(struct disk_stats
);
353 static inline void free_part_stats(struct hd_struct
*part
)
355 free_percpu(part
->dkstats
);
358 #else /* !CONFIG_SMP */
359 #define part_stat_lock() ({ rcu_read_lock(); 0; })
360 #define part_stat_unlock() rcu_read_unlock()
362 #define __part_stat_add(cpu, part, field, addnd) \
363 ((part)->dkstats.field += addnd)
365 #define part_stat_read(part, field) ((part)->dkstats.field)
367 static inline void part_stat_set_all(struct hd_struct
*part
, int value
)
369 memset(&part
->dkstats
, value
, sizeof(struct disk_stats
));
372 static inline int init_part_stats(struct hd_struct
*part
)
377 static inline void free_part_stats(struct hd_struct
*part
)
381 #endif /* CONFIG_SMP */
383 #define part_stat_add(cpu, part, field, addnd) do { \
384 __part_stat_add((cpu), (part), field, addnd); \
385 if ((part)->partno) \
386 __part_stat_add((cpu), &part_to_disk((part))->part0, \
390 #define part_stat_dec(cpu, gendiskp, field) \
391 part_stat_add(cpu, gendiskp, field, -1)
392 #define part_stat_inc(cpu, gendiskp, field) \
393 part_stat_add(cpu, gendiskp, field, 1)
394 #define part_stat_sub(cpu, gendiskp, field, subnd) \
395 part_stat_add(cpu, gendiskp, field, -subnd)
397 static inline void part_inc_in_flight(struct hd_struct
*part
, int rw
)
399 atomic_inc(&part
->in_flight
[rw
]);
401 atomic_inc(&part_to_disk(part
)->part0
.in_flight
[rw
]);
404 static inline void part_dec_in_flight(struct hd_struct
*part
, int rw
)
406 atomic_dec(&part
->in_flight
[rw
]);
408 atomic_dec(&part_to_disk(part
)->part0
.in_flight
[rw
]);
411 static inline int part_in_flight(struct hd_struct
*part
)
413 return atomic_read(&part
->in_flight
[0]) + atomic_read(&part
->in_flight
[1]);
416 static inline struct partition_meta_info
*alloc_part_info(struct gendisk
*disk
)
419 return kzalloc_node(sizeof(struct partition_meta_info
),
420 GFP_KERNEL
, disk
->node_id
);
421 return kzalloc(sizeof(struct partition_meta_info
), GFP_KERNEL
);
424 static inline void free_part_info(struct hd_struct
*part
)
429 /* block/blk-core.c */
430 extern void part_round_stats(int cpu
, struct hd_struct
*part
);
433 extern void add_disk(struct gendisk
*disk
);
434 extern void del_gendisk(struct gendisk
*gp
);
435 extern struct gendisk
*get_gendisk(dev_t dev
, int *partno
);
436 extern struct block_device
*bdget_disk(struct gendisk
*disk
, int partno
);
438 extern void set_device_ro(struct block_device
*bdev
, int flag
);
439 extern void set_disk_ro(struct gendisk
*disk
, int flag
);
441 static inline int get_disk_ro(struct gendisk
*disk
)
443 return disk
->part0
.policy
;
446 extern void disk_block_events(struct gendisk
*disk
);
447 extern void disk_unblock_events(struct gendisk
*disk
);
448 extern void disk_flush_events(struct gendisk
*disk
, unsigned int mask
);
449 extern unsigned int disk_clear_events(struct gendisk
*disk
, unsigned int mask
);
451 /* drivers/char/random.c */
452 extern void add_disk_randomness(struct gendisk
*disk
);
453 extern void rand_initialize_disk(struct gendisk
*disk
);
455 static inline sector_t
get_start_sect(struct block_device
*bdev
)
457 return bdev
->bd_part
->start_sect
;
459 static inline sector_t
get_capacity(struct gendisk
*disk
)
461 return disk
->part0
.nr_sects
;
463 static inline void set_capacity(struct gendisk
*disk
, sector_t size
)
465 disk
->part0
.nr_sects
= size
;
468 #ifdef CONFIG_SOLARIS_X86_PARTITION
470 #define SOLARIS_X86_NUMSLICE 16
471 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
473 struct solaris_x86_slice
{
474 __le16 s_tag
; /* ID tag of partition */
475 __le16 s_flag
; /* permission flags */
476 __le32 s_start
; /* start sector no of partition */
477 __le32 s_size
; /* # of blocks in partition */
480 struct solaris_x86_vtoc
{
481 unsigned int v_bootinfo
[3]; /* info needed by mboot (unsupported) */
482 __le32 v_sanity
; /* to verify vtoc sanity */
483 __le32 v_version
; /* layout version */
484 char v_volume
[8]; /* volume name */
485 __le16 v_sectorsz
; /* sector size in bytes */
486 __le16 v_nparts
; /* number of partitions */
487 unsigned int v_reserved
[10]; /* free space */
488 struct solaris_x86_slice
489 v_slice
[SOLARIS_X86_NUMSLICE
]; /* slice headers */
490 unsigned int timestamp
[SOLARIS_X86_NUMSLICE
]; /* timestamp (unsupported) */
491 char v_asciilabel
[128]; /* for compatibility */
494 #endif /* CONFIG_SOLARIS_X86_PARTITION */
496 #ifdef CONFIG_BSD_DISKLABEL
498 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
499 * updated by Marc Espie <Marc.Espie@openbsd.org>
502 /* check against BSD src/sys/sys/disklabel.h for consistency */
504 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
505 #define BSD_MAXPARTITIONS 16
506 #define OPENBSD_MAXPARTITIONS 16
507 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
508 struct bsd_disklabel
{
509 __le32 d_magic
; /* the magic number */
510 __s16 d_type
; /* drive type */
511 __s16 d_subtype
; /* controller/d_type specific */
512 char d_typename
[16]; /* type name, e.g. "eagle" */
513 char d_packname
[16]; /* pack identifier */
514 __u32 d_secsize
; /* # of bytes per sector */
515 __u32 d_nsectors
; /* # of data sectors per track */
516 __u32 d_ntracks
; /* # of tracks per cylinder */
517 __u32 d_ncylinders
; /* # of data cylinders per unit */
518 __u32 d_secpercyl
; /* # of data sectors per cylinder */
519 __u32 d_secperunit
; /* # of data sectors per unit */
520 __u16 d_sparespertrack
; /* # of spare sectors per track */
521 __u16 d_sparespercyl
; /* # of spare sectors per cylinder */
522 __u32 d_acylinders
; /* # of alt. cylinders per unit */
523 __u16 d_rpm
; /* rotational speed */
524 __u16 d_interleave
; /* hardware sector interleave */
525 __u16 d_trackskew
; /* sector 0 skew, per track */
526 __u16 d_cylskew
; /* sector 0 skew, per cylinder */
527 __u32 d_headswitch
; /* head switch time, usec */
528 __u32 d_trkseek
; /* track-to-track seek, usec */
529 __u32 d_flags
; /* generic flags */
531 __u32 d_drivedata
[NDDATA
]; /* drive-type specific information */
533 __u32 d_spare
[NSPARE
]; /* reserved for future use */
534 __le32 d_magic2
; /* the magic number (again) */
535 __le16 d_checksum
; /* xor of data incl. partitions */
537 /* filesystem and partition information: */
538 __le16 d_npartitions
; /* number of partitions in following */
539 __le32 d_bbsize
; /* size of boot area at sn0, bytes */
540 __le32 d_sbsize
; /* max size of fs superblock, bytes */
541 struct bsd_partition
{ /* the partition table */
542 __le32 p_size
; /* number of sectors in partition */
543 __le32 p_offset
; /* starting sector */
544 __le32 p_fsize
; /* filesystem basic fragment size */
545 __u8 p_fstype
; /* filesystem type, see below */
546 __u8 p_frag
; /* filesystem fragments per block */
547 __le16 p_cpg
; /* filesystem cylinders per group */
548 } d_partitions
[BSD_MAXPARTITIONS
]; /* actually may be more */
551 #endif /* CONFIG_BSD_DISKLABEL */
553 #ifdef CONFIG_UNIXWARE_DISKLABEL
555 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
556 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
559 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
560 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
561 #define UNIXWARE_NUMSLICE 16
562 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
564 struct unixware_slice
{
565 __le16 s_label
; /* label */
566 __le16 s_flags
; /* permission flags */
567 __le32 start_sect
; /* starting sector */
568 __le32 nr_sects
; /* number of sectors in slice */
571 struct unixware_disklabel
{
572 __le32 d_type
; /* drive type */
573 __le32 d_magic
; /* the magic number */
574 __le32 d_version
; /* version number */
575 char d_serial
[12]; /* serial number of the device */
576 __le32 d_ncylinders
; /* # of data cylinders per device */
577 __le32 d_ntracks
; /* # of tracks per cylinder */
578 __le32 d_nsectors
; /* # of data sectors per track */
579 __le32 d_secsize
; /* # of bytes per sector */
580 __le32 d_part_start
; /* # of first sector of this partition */
581 __le32 d_unknown1
[12]; /* ? */
582 __le32 d_alt_tbl
; /* byte offset of alternate table */
583 __le32 d_alt_len
; /* byte length of alternate table */
584 __le32 d_phys_cyl
; /* # of physical cylinders per device */
585 __le32 d_phys_trk
; /* # of physical tracks per cylinder */
586 __le32 d_phys_sec
; /* # of physical sectors per track */
587 __le32 d_phys_bytes
; /* # of physical bytes per sector */
588 __le32 d_unknown2
; /* ? */
589 __le32 d_unknown3
; /* ? */
590 __le32 d_pad
[8]; /* pad */
592 struct unixware_vtoc
{
593 __le32 v_magic
; /* the magic number */
594 __le32 v_version
; /* version number */
595 char v_name
[8]; /* volume name */
596 __le16 v_nslices
; /* # of slices */
597 __le16 v_unknown1
; /* ? */
598 __le32 v_reserved
[10]; /* reserved */
599 struct unixware_slice
600 v_slice
[UNIXWARE_NUMSLICE
]; /* slice headers */
605 #endif /* CONFIG_UNIXWARE_DISKLABEL */
607 #ifdef CONFIG_MINIX_SUBPARTITION
608 # define MINIX_NR_SUBPARTITIONS 4
609 #endif /* CONFIG_MINIX_SUBPARTITION */
611 #define ADDPART_FLAG_NONE 0
612 #define ADDPART_FLAG_RAID 1
613 #define ADDPART_FLAG_WHOLEDISK 2
615 extern int blk_alloc_devt(struct hd_struct
*part
, dev_t
*devt
);
616 extern void blk_free_devt(dev_t devt
);
617 extern dev_t
blk_lookup_devt(const char *name
, int partno
);
618 extern char *disk_name (struct gendisk
*hd
, int partno
, char *buf
);
620 extern int disk_expand_part_tbl(struct gendisk
*disk
, int target
);
621 extern int rescan_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
622 extern int invalidate_partitions(struct gendisk
*disk
, struct block_device
*bdev
);
623 extern struct hd_struct
* __must_check
add_partition(struct gendisk
*disk
,
624 int partno
, sector_t start
,
625 sector_t len
, int flags
,
626 struct partition_meta_info
628 extern void __delete_partition(struct percpu_ref
*);
629 extern void delete_partition(struct gendisk
*, int);
630 extern void printk_all_partitions(void);
632 extern struct gendisk
*alloc_disk_node(int minors
, int node_id
);
633 extern struct gendisk
*alloc_disk(int minors
);
634 extern struct kobject
*get_disk(struct gendisk
*disk
);
635 extern void put_disk(struct gendisk
*disk
);
636 extern void blk_register_region(dev_t devt
, unsigned long range
,
637 struct module
*module
,
638 struct kobject
*(*probe
)(dev_t
, int *, void *),
639 int (*lock
)(dev_t
, void *),
641 extern void blk_unregister_region(dev_t devt
, unsigned long range
);
643 extern ssize_t
part_size_show(struct device
*dev
,
644 struct device_attribute
*attr
, char *buf
);
645 extern ssize_t
part_stat_show(struct device
*dev
,
646 struct device_attribute
*attr
, char *buf
);
647 extern ssize_t
part_inflight_show(struct device
*dev
,
648 struct device_attribute
*attr
, char *buf
);
649 #ifdef CONFIG_FAIL_MAKE_REQUEST
650 extern ssize_t
part_fail_show(struct device
*dev
,
651 struct device_attribute
*attr
, char *buf
);
652 extern ssize_t
part_fail_store(struct device
*dev
,
653 struct device_attribute
*attr
,
654 const char *buf
, size_t count
);
655 #endif /* CONFIG_FAIL_MAKE_REQUEST */
657 static inline int hd_ref_init(struct hd_struct
*part
)
659 if (percpu_ref_init(&part
->ref
, __delete_partition
, 0,
665 static inline void hd_struct_get(struct hd_struct
*part
)
667 percpu_ref_get(&part
->ref
);
670 static inline int hd_struct_try_get(struct hd_struct
*part
)
672 return percpu_ref_tryget_live(&part
->ref
);
675 static inline void hd_struct_put(struct hd_struct
*part
)
677 percpu_ref_put(&part
->ref
);
680 static inline void hd_struct_kill(struct hd_struct
*part
)
682 percpu_ref_kill(&part
->ref
);
685 static inline void hd_free_part(struct hd_struct
*part
)
687 free_part_stats(part
);
688 free_part_info(part
);
689 percpu_ref_exit(&part
->ref
);
693 * Any access of part->nr_sects which is not protected by partition
694 * bd_mutex or gendisk bdev bd_mutex, should be done using this
697 * Code written along the lines of i_size_read() and i_size_write().
698 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
701 static inline sector_t
part_nr_sects_read(struct hd_struct
*part
)
703 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
707 seq
= read_seqcount_begin(&part
->nr_sects_seq
);
708 nr_sects
= part
->nr_sects
;
709 } while (read_seqcount_retry(&part
->nr_sects_seq
, seq
));
711 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
715 nr_sects
= part
->nr_sects
;
719 return part
->nr_sects
;
724 * Should be called with mutex lock held (typically bd_mutex) of partition
725 * to provide mutual exlusion among writers otherwise seqcount might be
726 * left in wrong state leaving the readers spinning infinitely.
728 static inline void part_nr_sects_write(struct hd_struct
*part
, sector_t size
)
730 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
731 write_seqcount_begin(&part
->nr_sects_seq
);
732 part
->nr_sects
= size
;
733 write_seqcount_end(&part
->nr_sects_seq
);
734 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
736 part
->nr_sects
= size
;
739 part
->nr_sects
= size
;
743 #if defined(CONFIG_BLK_DEV_INTEGRITY)
744 extern void blk_integrity_add(struct gendisk
*);
745 extern void blk_integrity_del(struct gendisk
*);
746 extern void blk_integrity_revalidate(struct gendisk
*);
747 #else /* CONFIG_BLK_DEV_INTEGRITY */
748 static inline void blk_integrity_add(struct gendisk
*disk
) { }
749 static inline void blk_integrity_del(struct gendisk
*disk
) { }
750 static inline void blk_integrity_revalidate(struct gendisk
*disk
) { }
751 #endif /* CONFIG_BLK_DEV_INTEGRITY */
753 #else /* CONFIG_BLOCK */
755 static inline void printk_all_partitions(void) { }
757 static inline dev_t
blk_lookup_devt(const char *name
, int partno
)
759 dev_t devt
= MKDEV(0, 0);
763 static inline int blk_part_pack_uuid(const u8
*uuid_str
, u8
*to
)
767 #endif /* CONFIG_BLOCK */
769 #endif /* _LINUX_GENHD_H */