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_dec_in_flight(struct request_queue *q, struct hd_struct *part,
374 void part_inc_in_flight(struct request_queue *q, struct hd_struct *part,
377 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
380 return kzalloc_node(sizeof(struct partition_meta_info),
381 GFP_KERNEL, disk->node_id);
382 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
385 static inline void free_part_info(struct hd_struct *part)
390 /* block/blk-core.c */
391 extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part);
394 extern void device_add_disk(struct device *parent, struct gendisk *disk);
395 static inline void add_disk(struct gendisk *disk)
397 device_add_disk(NULL, disk);
399 extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
400 static inline void add_disk_no_queue_reg(struct gendisk *disk)
402 device_add_disk_no_queue_reg(NULL, disk);
405 extern void del_gendisk(struct gendisk *gp);
406 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
407 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
409 extern void set_device_ro(struct block_device *bdev, int flag);
410 extern void set_disk_ro(struct gendisk *disk, int flag);
412 static inline int get_disk_ro(struct gendisk *disk)
414 return disk->part0.policy;
417 extern void disk_block_events(struct gendisk *disk);
418 extern void disk_unblock_events(struct gendisk *disk);
419 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
420 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
422 /* drivers/char/random.c */
423 extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
424 extern void rand_initialize_disk(struct gendisk *disk);
426 static inline sector_t get_start_sect(struct block_device *bdev)
428 return bdev->bd_part->start_sect;
430 static inline sector_t get_capacity(struct gendisk *disk)
432 return disk->part0.nr_sects;
434 static inline void set_capacity(struct gendisk *disk, sector_t size)
436 disk->part0.nr_sects = size;
439 #ifdef CONFIG_SOLARIS_X86_PARTITION
441 #define SOLARIS_X86_NUMSLICE 16
442 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
444 struct solaris_x86_slice {
445 __le16 s_tag; /* ID tag of partition */
446 __le16 s_flag; /* permission flags */
447 __le32 s_start; /* start sector no of partition */
448 __le32 s_size; /* # of blocks in partition */
451 struct solaris_x86_vtoc {
452 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
453 __le32 v_sanity; /* to verify vtoc sanity */
454 __le32 v_version; /* layout version */
455 char v_volume[8]; /* volume name */
456 __le16 v_sectorsz; /* sector size in bytes */
457 __le16 v_nparts; /* number of partitions */
458 unsigned int v_reserved[10]; /* free space */
459 struct solaris_x86_slice
460 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
461 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
462 char v_asciilabel[128]; /* for compatibility */
465 #endif /* CONFIG_SOLARIS_X86_PARTITION */
467 #ifdef CONFIG_BSD_DISKLABEL
469 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
470 * updated by Marc Espie <Marc.Espie@openbsd.org>
473 /* check against BSD src/sys/sys/disklabel.h for consistency */
475 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
476 #define BSD_MAXPARTITIONS 16
477 #define OPENBSD_MAXPARTITIONS 16
478 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
479 struct bsd_disklabel {
480 __le32 d_magic; /* the magic number */
481 __s16 d_type; /* drive type */
482 __s16 d_subtype; /* controller/d_type specific */
483 char d_typename[16]; /* type name, e.g. "eagle" */
484 char d_packname[16]; /* pack identifier */
485 __u32 d_secsize; /* # of bytes per sector */
486 __u32 d_nsectors; /* # of data sectors per track */
487 __u32 d_ntracks; /* # of tracks per cylinder */
488 __u32 d_ncylinders; /* # of data cylinders per unit */
489 __u32 d_secpercyl; /* # of data sectors per cylinder */
490 __u32 d_secperunit; /* # of data sectors per unit */
491 __u16 d_sparespertrack; /* # of spare sectors per track */
492 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
493 __u32 d_acylinders; /* # of alt. cylinders per unit */
494 __u16 d_rpm; /* rotational speed */
495 __u16 d_interleave; /* hardware sector interleave */
496 __u16 d_trackskew; /* sector 0 skew, per track */
497 __u16 d_cylskew; /* sector 0 skew, per cylinder */
498 __u32 d_headswitch; /* head switch time, usec */
499 __u32 d_trkseek; /* track-to-track seek, usec */
500 __u32 d_flags; /* generic flags */
502 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
504 __u32 d_spare[NSPARE]; /* reserved for future use */
505 __le32 d_magic2; /* the magic number (again) */
506 __le16 d_checksum; /* xor of data incl. partitions */
508 /* filesystem and partition information: */
509 __le16 d_npartitions; /* number of partitions in following */
510 __le32 d_bbsize; /* size of boot area at sn0, bytes */
511 __le32 d_sbsize; /* max size of fs superblock, bytes */
512 struct bsd_partition { /* the partition table */
513 __le32 p_size; /* number of sectors in partition */
514 __le32 p_offset; /* starting sector */
515 __le32 p_fsize; /* filesystem basic fragment size */
516 __u8 p_fstype; /* filesystem type, see below */
517 __u8 p_frag; /* filesystem fragments per block */
518 __le16 p_cpg; /* filesystem cylinders per group */
519 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
522 #endif /* CONFIG_BSD_DISKLABEL */
524 #ifdef CONFIG_UNIXWARE_DISKLABEL
526 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
527 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
530 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
531 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
532 #define UNIXWARE_NUMSLICE 16
533 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
535 struct unixware_slice {
536 __le16 s_label; /* label */
537 __le16 s_flags; /* permission flags */
538 __le32 start_sect; /* starting sector */
539 __le32 nr_sects; /* number of sectors in slice */
542 struct unixware_disklabel {
543 __le32 d_type; /* drive type */
544 __le32 d_magic; /* the magic number */
545 __le32 d_version; /* version number */
546 char d_serial[12]; /* serial number of the device */
547 __le32 d_ncylinders; /* # of data cylinders per device */
548 __le32 d_ntracks; /* # of tracks per cylinder */
549 __le32 d_nsectors; /* # of data sectors per track */
550 __le32 d_secsize; /* # of bytes per sector */
551 __le32 d_part_start; /* # of first sector of this partition */
552 __le32 d_unknown1[12]; /* ? */
553 __le32 d_alt_tbl; /* byte offset of alternate table */
554 __le32 d_alt_len; /* byte length of alternate table */
555 __le32 d_phys_cyl; /* # of physical cylinders per device */
556 __le32 d_phys_trk; /* # of physical tracks per cylinder */
557 __le32 d_phys_sec; /* # of physical sectors per track */
558 __le32 d_phys_bytes; /* # of physical bytes per sector */
559 __le32 d_unknown2; /* ? */
560 __le32 d_unknown3; /* ? */
561 __le32 d_pad[8]; /* pad */
563 struct unixware_vtoc {
564 __le32 v_magic; /* the magic number */
565 __le32 v_version; /* version number */
566 char v_name[8]; /* volume name */
567 __le16 v_nslices; /* # of slices */
568 __le16 v_unknown1; /* ? */
569 __le32 v_reserved[10]; /* reserved */
570 struct unixware_slice
571 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
576 #endif /* CONFIG_UNIXWARE_DISKLABEL */
578 #ifdef CONFIG_MINIX_SUBPARTITION
579 # define MINIX_NR_SUBPARTITIONS 4
580 #endif /* CONFIG_MINIX_SUBPARTITION */
582 #define ADDPART_FLAG_NONE 0
583 #define ADDPART_FLAG_RAID 1
584 #define ADDPART_FLAG_WHOLEDISK 2
586 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
587 extern void blk_free_devt(dev_t devt);
588 extern dev_t blk_lookup_devt(const char *name, int partno);
589 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
591 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
592 extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
593 extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
594 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
595 int partno, sector_t start,
596 sector_t len, int flags,
597 struct partition_meta_info
599 extern void __delete_partition(struct percpu_ref *);
600 extern void delete_partition(struct gendisk *, int);
601 extern void printk_all_partitions(void);
603 extern struct gendisk *__alloc_disk_node(int minors, int node_id);
604 extern struct kobject *get_disk_and_module(struct gendisk *disk);
605 extern void put_disk(struct gendisk *disk);
606 extern void put_disk_and_module(struct gendisk *disk);
607 extern void blk_register_region(dev_t devt, unsigned long range,
608 struct module *module,
609 struct kobject *(*probe)(dev_t, int *, void *),
610 int (*lock)(dev_t, void *),
612 extern void blk_unregister_region(dev_t devt, unsigned long range);
614 extern ssize_t part_size_show(struct device *dev,
615 struct device_attribute *attr, char *buf);
616 extern ssize_t part_stat_show(struct device *dev,
617 struct device_attribute *attr, char *buf);
618 extern ssize_t part_inflight_show(struct device *dev,
619 struct device_attribute *attr, char *buf);
620 #ifdef CONFIG_FAIL_MAKE_REQUEST
621 extern ssize_t part_fail_show(struct device *dev,
622 struct device_attribute *attr, char *buf);
623 extern ssize_t part_fail_store(struct device *dev,
624 struct device_attribute *attr,
625 const char *buf, size_t count);
626 #endif /* CONFIG_FAIL_MAKE_REQUEST */
628 #define alloc_disk_node(minors, node_id) \
630 static struct lock_class_key __key; \
631 const char *__name; \
632 struct gendisk *__disk; \
634 __name = "(gendisk_completion)"#minors"("#node_id")"; \
636 __disk = __alloc_disk_node(minors, node_id); \
639 lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
644 #define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
646 static inline int hd_ref_init(struct hd_struct *part)
648 if (percpu_ref_init(&part->ref, __delete_partition, 0,
654 static inline void hd_struct_get(struct hd_struct *part)
656 percpu_ref_get(&part->ref);
659 static inline int hd_struct_try_get(struct hd_struct *part)
661 return percpu_ref_tryget_live(&part->ref);
664 static inline void hd_struct_put(struct hd_struct *part)
666 percpu_ref_put(&part->ref);
669 static inline void hd_struct_kill(struct hd_struct *part)
671 percpu_ref_kill(&part->ref);
674 static inline void hd_free_part(struct hd_struct *part)
676 free_part_stats(part);
677 free_part_info(part);
678 percpu_ref_exit(&part->ref);
682 * Any access of part->nr_sects which is not protected by partition
683 * bd_mutex or gendisk bdev bd_mutex, should be done using this
686 * Code written along the lines of i_size_read() and i_size_write().
687 * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
690 static inline sector_t part_nr_sects_read(struct hd_struct *part)
692 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
696 seq = read_seqcount_begin(&part->nr_sects_seq);
697 nr_sects = part->nr_sects;
698 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
700 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
704 nr_sects = part->nr_sects;
708 return part->nr_sects;
713 * Should be called with mutex lock held (typically bd_mutex) of partition
714 * to provide mutual exlusion among writers otherwise seqcount might be
715 * left in wrong state leaving the readers spinning infinitely.
717 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
719 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
720 write_seqcount_begin(&part->nr_sects_seq);
721 part->nr_sects = size;
722 write_seqcount_end(&part->nr_sects_seq);
723 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
725 part->nr_sects = size;
728 part->nr_sects = size;
732 #if defined(CONFIG_BLK_DEV_INTEGRITY)
733 extern void blk_integrity_add(struct gendisk *);
734 extern void blk_integrity_del(struct gendisk *);
735 #else /* CONFIG_BLK_DEV_INTEGRITY */
736 static inline void blk_integrity_add(struct gendisk *disk) { }
737 static inline void blk_integrity_del(struct gendisk *disk) { }
738 #endif /* CONFIG_BLK_DEV_INTEGRITY */
740 #else /* CONFIG_BLOCK */
742 static inline void printk_all_partitions(void) { }
744 static inline dev_t blk_lookup_devt(const char *name, int partno)
746 dev_t devt = MKDEV(0, 0);
749 #endif /* CONFIG_BLOCK */
751 #endif /* _LINUX_GENHD_H */