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[];
167 /* major, first_minor and minors are input parameters only,
168 * don't use directly. Use disk_devt() and disk_max_parts().
170 int major; /* major number of driver */
172 int minors; /* maximum number of minors, =1 for
173 * disks that can't be partitioned. */
175 char disk_name[DISK_NAME_LEN]; /* name of major driver */
176 char *(*devnode)(struct gendisk *gd, umode_t *mode);
178 unsigned int events; /* supported events */
179 unsigned int async_events; /* async events, subset of all */
181 /* Array of pointers to partitions indexed by partno.
182 * Protected with matching bdev lock but stat and other
183 * non-critical accesses use RCU. Always access through
186 struct disk_part_tbl __rcu *part_tbl;
187 struct hd_struct part0;
189 const struct block_device_operations *fops;
190 struct request_queue *queue;
194 struct device *driverfs_dev; // FIXME: remove
195 struct kobject *slave_dir;
197 struct timer_rand_state *random;
198 atomic_t sync_io; /* RAID */
199 struct disk_events *ev;
200 #ifdef CONFIG_BLK_DEV_INTEGRITY
201 struct blk_integrity *integrity;
202 struct kobject integrity_kobj;
207 static inline struct gendisk *part_to_disk(struct hd_struct *part)
211 return dev_to_disk(part_to_dev(part)->parent);
213 return dev_to_disk(part_to_dev(part));
218 static inline void part_pack_uuid(const u8 *uuid_str, u8 *to)
221 for (i = 0; i < 16; ++i) {
222 *to++ = (hex_to_bin(*uuid_str) << 4) |
223 (hex_to_bin(*(uuid_str + 1)));
236 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
238 part_pack_uuid(uuid_str, to);
242 static inline int disk_max_parts(struct gendisk *disk)
244 if (disk->flags & GENHD_FL_EXT_DEVT)
245 return DISK_MAX_PARTS;
249 static inline bool disk_part_scan_enabled(struct gendisk *disk)
251 return disk_max_parts(disk) > 1 &&
252 !(disk->flags & GENHD_FL_NO_PART_SCAN);
255 static inline dev_t disk_devt(struct gendisk *disk)
257 return disk_to_dev(disk)->devt;
260 static inline dev_t part_devt(struct hd_struct *part)
262 return part_to_dev(part)->devt;
265 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
267 static inline void disk_put_part(struct hd_struct *part)
270 put_device(part_to_dev(part));
274 * Smarter partition iterator without context limits.
276 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
277 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
278 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
279 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
281 struct disk_part_iter {
282 struct gendisk *disk;
283 struct hd_struct *part;
288 extern void disk_part_iter_init(struct disk_part_iter *piter,
289 struct gendisk *disk, unsigned int flags);
290 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
291 extern void disk_part_iter_exit(struct disk_part_iter *piter);
293 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
297 * Macros to operate on percpu disk statistics:
299 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
300 * and should be called between disk_stat_lock() and
301 * disk_stat_unlock().
303 * part_stat_read() can be called at any time.
305 * part_stat_{add|set_all}() and {init|free}_part_stats are for
309 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
310 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
312 #define __part_stat_add(cpu, part, field, addnd) \
313 (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
315 #define part_stat_read(part, field) \
317 typeof((part)->dkstats->field) res = 0; \
319 for_each_possible_cpu(_cpu) \
320 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
324 static inline void part_stat_set_all(struct hd_struct *part, int value)
328 for_each_possible_cpu(i)
329 memset(per_cpu_ptr(part->dkstats, i), value,
330 sizeof(struct disk_stats));
333 static inline int init_part_stats(struct hd_struct *part)
335 part->dkstats = alloc_percpu(struct disk_stats);
341 static inline void free_part_stats(struct hd_struct *part)
343 free_percpu(part->dkstats);
346 #else /* !CONFIG_SMP */
347 #define part_stat_lock() ({ rcu_read_lock(); 0; })
348 #define part_stat_unlock() rcu_read_unlock()
350 #define __part_stat_add(cpu, part, field, addnd) \
351 ((part)->dkstats.field += addnd)
353 #define part_stat_read(part, field) ((part)->dkstats.field)
355 static inline void part_stat_set_all(struct hd_struct *part, int value)
357 memset(&part->dkstats, value, sizeof(struct disk_stats));
360 static inline int init_part_stats(struct hd_struct *part)
365 static inline void free_part_stats(struct hd_struct *part)
369 #endif /* CONFIG_SMP */
371 #define part_stat_add(cpu, part, field, addnd) do { \
372 __part_stat_add((cpu), (part), field, addnd); \
373 if ((part)->partno) \
374 __part_stat_add((cpu), &part_to_disk((part))->part0, \
378 #define part_stat_dec(cpu, gendiskp, field) \
379 part_stat_add(cpu, gendiskp, field, -1)
380 #define part_stat_inc(cpu, gendiskp, field) \
381 part_stat_add(cpu, gendiskp, field, 1)
382 #define part_stat_sub(cpu, gendiskp, field, subnd) \
383 part_stat_add(cpu, gendiskp, field, -subnd)
385 static inline void part_inc_in_flight(struct hd_struct *part, int rw)
387 atomic_inc(&part->in_flight[rw]);
389 atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
392 static inline void part_dec_in_flight(struct hd_struct *part, int rw)
394 atomic_dec(&part->in_flight[rw]);
396 atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
399 static inline int part_in_flight(struct hd_struct *part)
401 return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
404 static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
407 return kzalloc_node(sizeof(struct partition_meta_info),
408 GFP_KERNEL, disk->node_id);
409 return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
412 static inline void free_part_info(struct hd_struct *part)
417 /* block/blk-core.c */
418 extern void part_round_stats(int cpu, struct hd_struct *part);
421 extern void add_disk(struct gendisk *disk);
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);
426 extern void set_device_ro(struct block_device *bdev, int flag);
427 extern void set_disk_ro(struct gendisk *disk, int flag);
429 static inline int get_disk_ro(struct gendisk *disk)
431 return disk->part0.policy;
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);
439 /* drivers/char/random.c */
440 extern void add_disk_randomness(struct gendisk *disk);
441 extern void rand_initialize_disk(struct gendisk *disk);
443 static inline sector_t get_start_sect(struct block_device *bdev)
445 return bdev->bd_part->start_sect;
447 static inline sector_t get_capacity(struct gendisk *disk)
449 return disk->part0.nr_sects;
451 static inline void set_capacity(struct gendisk *disk, sector_t size)
453 disk->part0.nr_sects = size;
456 #ifdef CONFIG_SOLARIS_X86_PARTITION
458 #define SOLARIS_X86_NUMSLICE 16
459 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
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 */
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 */
482 #endif /* CONFIG_SOLARIS_X86_PARTITION */
484 #ifdef CONFIG_BSD_DISKLABEL
486 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
487 * updated by Marc Espie <Marc.Espie@openbsd.org>
490 /* check against BSD src/sys/sys/disklabel.h for consistency */
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 */
519 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
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 */
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 */
539 #endif /* CONFIG_BSD_DISKLABEL */
541 #ifdef CONFIG_UNIXWARE_DISKLABEL
543 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
544 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
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 */
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 */
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 */
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 */
593 #endif /* CONFIG_UNIXWARE_DISKLABEL */
595 #ifdef CONFIG_MINIX_SUBPARTITION
596 # define MINIX_NR_SUBPARTITIONS 4
597 #endif /* CONFIG_MINIX_SUBPARTITION */
599 #define ADDPART_FLAG_NONE 0
600 #define ADDPART_FLAG_RAID 1
601 #define ADDPART_FLAG_WHOLEDISK 2
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);
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
616 extern void __delete_partition(struct percpu_ref *);
617 extern void delete_partition(struct gendisk *, int);
618 extern void printk_all_partitions(void);
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 *),
629 extern void blk_unregister_region(dev_t devt, unsigned long range);
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 */
645 static inline int hd_ref_init(struct hd_struct *part)
647 if (percpu_ref_init(&part->ref, __delete_partition, 0,
653 static inline void hd_struct_get(struct hd_struct *part)
655 percpu_ref_get(&part->ref);
658 static inline int hd_struct_try_get(struct hd_struct *part)
660 return percpu_ref_tryget_live(&part->ref);
663 static inline void hd_struct_put(struct hd_struct *part)
665 percpu_ref_put(&part->ref);
668 static inline void hd_struct_kill(struct hd_struct *part)
670 percpu_ref_kill(&part->ref);
673 static inline void hd_free_part(struct hd_struct *part)
675 free_part_stats(part);
676 free_part_info(part);
677 percpu_ref_exit(&part->ref);
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
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
689 static inline sector_t part_nr_sects_read(struct hd_struct *part)
691 #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
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));
699 #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
703 nr_sects = part->nr_sects;
707 return part->nr_sects;
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.
716 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
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)
724 part->nr_sects = size;
727 part->nr_sects = size;
731 #else /* CONFIG_BLOCK */
733 static inline void printk_all_partitions(void) { }
735 static inline dev_t blk_lookup_devt(const char *name, int partno)
737 dev_t devt = MKDEV(0, 0);
741 static inline int blk_part_pack_uuid(const u8 *uuid_str, u8 *to)
745 #endif /* CONFIG_BLOCK */
747 #endif /* _LINUX_GENHD_H */