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>
19 #include <linux/blk_types.h>
20 #include <asm/local.h>
24 #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
25 #define dev_to_part(device) container_of((device), struct hd_struct, __dev)
26 #define disk_to_dev(disk) (&(disk)->part0.__dev)
27 #define part_to_dev(part) (&((part)->__dev))
29 extern struct device_type part_type;
30 extern struct kobject *block_depr;
31 extern struct class block_class;
34 /* These three have identical behaviour; use the second one if DOS FDISK gets
35 confused about extended/logical partitions starting past cylinder 1023. */
36 DOS_EXTENDED_PARTITION = 5,
37 LINUX_EXTENDED_PARTITION = 0x85,
38 WIN98_EXTENDED_PARTITION = 0x0f,
40 SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
42 LINUX_SWAP_PARTITION = 0x82,
43 LINUX_DATA_PARTITION = 0x83,
44 LINUX_LVM_PARTITION = 0x8e,
45 LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
47 SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
48 NEW_SOLARIS_X86_PARTITION = 0xbf,
50 DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
51 DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
52 DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
53 EZD_PARTITION = 0x55, /* EZ-DRIVE */
55 FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
56 OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
57 NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
58 BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
59 MINIX_PARTITION = 0x81, /* Minix Partition ID */
60 UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
63 #define DISK_MAX_PARTS 256
64 #define DISK_NAME_LEN 32
66 #include <linux/major.h>
67 #include <linux/device.h>
68 #include <linux/smp.h>
69 #include <linux/string.h>
71 #include <linux/workqueue.h>
74 unsigned char boot_ind; /* 0x80 - active */
75 unsigned char head; /* starting head */
76 unsigned char sector; /* starting sector */
77 unsigned char cyl; /* starting cylinder */
78 unsigned char sys_ind; /* What partition type */
79 unsigned char end_head; /* end head */
80 unsigned char end_sector; /* end sector */
81 unsigned char end_cyl; /* end cylinder */
82 __le32 start_sect; /* starting sector counting from 0 */
83 __le32 nr_sects; /* nr of sectors in partition */
84 } __attribute__((packed));
87 u64 nsecs[NR_STAT_GROUPS];
88 unsigned long sectors[NR_STAT_GROUPS];
89 unsigned long ios[NR_STAT_GROUPS];
90 unsigned long merges[NR_STAT_GROUPS];
91 unsigned long io_ticks;
92 unsigned long time_in_queue;
96 #define PARTITION_META_INFO_VOLNAMELTH 64
98 * Enough for the string representation of any kind of UUID plus NULL.
99 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
101 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
103 struct partition_meta_info {
104 char uuid[PARTITION_META_INFO_UUIDLTH];
105 u8 volname[PARTITION_META_INFO_VOLNAMELTH];
111 * nr_sects is protected by sequence counter. One might extend a
112 * partition while IO is happening to it and update of nr_sects
113 * can be non-atomic on 32bit machines with 64bit sector_t.
116 seqcount_t nr_sects_seq;
117 sector_t alignment_offset;
118 unsigned int discard_alignment;
120 struct kobject *holder_dir;
122 struct partition_meta_info *info;
123 #ifdef CONFIG_FAIL_MAKE_REQUEST
128 struct disk_stats __percpu *dkstats;
130 struct disk_stats dkstats;
132 struct percpu_ref ref;
133 struct rcu_work rcu_work;
137 * DOC: genhd capability flags
139 * ``GENHD_FL_REMOVABLE`` (0x0001): indicates that the block device
140 * gives access to removable media.
141 * When set, the device remains present even when media is not
143 * Must not be set for devices which are removed entirely when the
146 * ``GENHD_FL_CD`` (0x0008): the block device is a CD-ROM-style
148 * Affects responses to the ``CDROM_GET_CAPABILITY`` ioctl.
150 * ``GENHD_FL_UP`` (0x0010): indicates that the block device is "up",
151 * with a similar meaning to network interfaces.
153 * ``GENHD_FL_SUPPRESS_PARTITION_INFO`` (0x0020): don't include
154 * partition information in ``/proc/partitions`` or in the output of
155 * printk_all_partitions().
156 * Used for the null block device and some MMC devices.
158 * ``GENHD_FL_EXT_DEVT`` (0x0040): the driver supports extended
159 * dynamic ``dev_t``, i.e. it wants extended device numbers
160 * (``BLOCK_EXT_MAJOR``).
161 * This affects the maximum number of partitions.
163 * ``GENHD_FL_NATIVE_CAPACITY`` (0x0080): based on information in the
164 * partition table, the device's capacity has been extended to its
165 * native capacity; i.e. the device has hidden capacity used by one
166 * of the partitions (this is a flag used so that native capacity is
167 * only ever unlocked once).
169 * ``GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE`` (0x0100): event polling is
170 * blocked whenever a writer holds an exclusive lock.
172 * ``GENHD_FL_NO_PART_SCAN`` (0x0200): partition scanning is disabled.
173 * Used for loop devices in their default settings and some MMC
176 * ``GENHD_FL_HIDDEN`` (0x0400): the block device is hidden; it
177 * doesn't produce events, doesn't appear in sysfs, and doesn't have
178 * an associated ``bdev``.
179 * Implies ``GENHD_FL_SUPPRESS_PARTITION_INFO`` and
180 * ``GENHD_FL_NO_PART_SCAN``.
181 * Used for multipath devices.
183 #define GENHD_FL_REMOVABLE 0x0001
184 /* 2 is unused (used to be GENHD_FL_DRIVERFS) */
185 /* 4 is unused (used to be GENHD_FL_MEDIA_CHANGE_NOTIFY) */
186 #define GENHD_FL_CD 0x0008
187 #define GENHD_FL_UP 0x0010
188 #define GENHD_FL_SUPPRESS_PARTITION_INFO 0x0020
189 #define GENHD_FL_EXT_DEVT 0x0040
190 #define GENHD_FL_NATIVE_CAPACITY 0x0080
191 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 0x0100
192 #define GENHD_FL_NO_PART_SCAN 0x0200
193 #define GENHD_FL_HIDDEN 0x0400
196 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
197 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
201 /* Poll even if events_poll_msecs is unset */
202 DISK_EVENT_FLAG_POLL = 1 << 0,
203 /* Forward events to udev */
204 DISK_EVENT_FLAG_UEVENT = 1 << 1,
207 struct disk_part_tbl {
208 struct rcu_head rcu_head;
210 struct hd_struct __rcu *last_lookup;
211 struct hd_struct __rcu *part[];
217 #if defined(CONFIG_BLK_DEV_INTEGRITY)
219 struct blk_integrity {
220 const struct blk_integrity_profile *profile;
222 unsigned char tuple_size;
223 unsigned char interval_exp;
224 unsigned char tag_size;
227 #endif /* CONFIG_BLK_DEV_INTEGRITY */
230 /* major, first_minor and minors are input parameters only,
231 * don't use directly. Use disk_devt() and disk_max_parts().
233 int major; /* major number of driver */
235 int minors; /* maximum number of minors, =1 for
236 * disks that can't be partitioned. */
238 char disk_name[DISK_NAME_LEN]; /* name of major driver */
239 char *(*devnode)(struct gendisk *gd, umode_t *mode);
241 unsigned short events; /* supported events */
242 unsigned short event_flags; /* flags related to event processing */
244 /* Array of pointers to partitions indexed by partno.
245 * Protected with matching bdev lock but stat and other
246 * non-critical accesses use RCU. Always access through
249 struct disk_part_tbl __rcu *part_tbl;
250 struct hd_struct part0;
252 const struct block_device_operations *fops;
253 struct request_queue *queue;
257 struct rw_semaphore lookup_sem;
258 struct kobject *slave_dir;
260 struct timer_rand_state *random;
261 atomic_t sync_io; /* RAID */
262 struct disk_events *ev;
263 #ifdef CONFIG_BLK_DEV_INTEGRITY
264 struct kobject integrity_kobj;
265 #endif /* CONFIG_BLK_DEV_INTEGRITY */
267 struct badblocks *bb;
268 struct lockdep_map lockdep_map;
271 static inline struct gendisk *part_to_disk(struct hd_struct *part)
275 return dev_to_disk(part_to_dev(part)->parent);
277 return dev_to_disk(part_to_dev(part));
282 static inline int disk_max_parts(struct gendisk *disk)
284 if (disk->flags & GENHD_FL_EXT_DEVT)
285 return DISK_MAX_PARTS;
289 static inline bool disk_part_scan_enabled(struct gendisk *disk)
291 return disk_max_parts(disk) > 1 &&
292 !(disk->flags & GENHD_FL_NO_PART_SCAN);
295 static inline bool disk_has_partitions(struct gendisk *disk)
300 if (rcu_dereference(disk->part_tbl)->len > 1)
307 static inline dev_t disk_devt(struct gendisk *disk)
309 return MKDEV(disk->major, disk->first_minor);
312 static inline dev_t part_devt(struct hd_struct *part)
314 return part_to_dev(part)->devt;
317 extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
318 extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
320 static inline void disk_put_part(struct hd_struct *part)
323 put_device(part_to_dev(part));
327 * Smarter partition iterator without context limits.
329 #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
330 #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
331 #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
332 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
334 struct disk_part_iter {
335 struct gendisk *disk;
336 struct hd_struct *part;
341 extern void disk_part_iter_init(struct disk_part_iter *piter,
342 struct gendisk *disk, unsigned int flags);
343 extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
344 extern void disk_part_iter_exit(struct disk_part_iter *piter);
346 extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
350 * Macros to operate on percpu disk statistics:
352 * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
353 * and should be called between disk_stat_lock() and
354 * disk_stat_unlock().
356 * part_stat_read() can be called at any time.
358 * part_stat_{add|set_all}() and {init|free}_part_stats are for
362 #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
363 #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
365 #define part_stat_get_cpu(part, field, cpu) \
366 (per_cpu_ptr((part)->dkstats, (cpu))->field)
368 #define part_stat_get(part, field) \
369 part_stat_get_cpu(part, field, smp_processor_id())
371 #define part_stat_read(part, field) \
373 typeof((part)->dkstats->field) res = 0; \
375 for_each_possible_cpu(_cpu) \
376 res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
380 static inline void part_stat_set_all(struct hd_struct *part, int value)
384 for_each_possible_cpu(i)
385 memset(per_cpu_ptr(part->dkstats, i), value,
386 sizeof(struct disk_stats));
389 static inline int init_part_stats(struct hd_struct *part)
391 part->dkstats = alloc_percpu(struct disk_stats);
397 static inline void free_part_stats(struct hd_struct *part)
399 free_percpu(part->dkstats);
402 #else /* !CONFIG_SMP */
403 #define part_stat_lock() ({ rcu_read_lock(); 0; })
404 #define part_stat_unlock() rcu_read_unlock()
406 #define part_stat_get(part, field) ((part)->dkstats.field)
407 #define part_stat_get_cpu(part, field, cpu) part_stat_get(part, field)
408 #define part_stat_read(part, field) part_stat_get(part, field)
410 static inline void part_stat_set_all(struct hd_struct *part, int value)
412 memset(&part->dkstats, value, sizeof(struct disk_stats));
415 static inline int init_part_stats(struct hd_struct *part)
420 static inline void free_part_stats(struct hd_struct *part)
424 #endif /* CONFIG_SMP */
426 #define part_stat_read_msecs(part, which) \
427 div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC)
429 #define part_stat_read_accum(part, field) \
430 (part_stat_read(part, field[STAT_READ]) + \
431 part_stat_read(part, field[STAT_WRITE]) + \
432 part_stat_read(part, field[STAT_DISCARD]))
434 #define __part_stat_add(part, field, addnd) \
435 (part_stat_get(part, field) += (addnd))
437 #define part_stat_add(part, field, addnd) do { \
438 __part_stat_add((part), field, addnd); \
439 if ((part)->partno) \
440 __part_stat_add(&part_to_disk((part))->part0, \
444 #define part_stat_dec(gendiskp, field) \
445 part_stat_add(gendiskp, field, -1)
446 #define part_stat_inc(gendiskp, field) \
447 part_stat_add(gendiskp, field, 1)
448 #define part_stat_sub(gendiskp, field, subnd) \
449 part_stat_add(gendiskp, field, -subnd)
451 #define part_stat_local_dec(gendiskp, field) \
452 local_dec(&(part_stat_get(gendiskp, field)))
453 #define part_stat_local_inc(gendiskp, field) \
454 local_inc(&(part_stat_get(gendiskp, field)))
455 #define part_stat_local_read(gendiskp, field) \
456 local_read(&(part_stat_get(gendiskp, field)))
457 #define part_stat_local_read_cpu(gendiskp, field, cpu) \
458 local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
460 unsigned int part_in_flight(struct request_queue *q, struct hd_struct *part);
461 void part_in_flight_rw(struct request_queue *q, struct hd_struct *part,
462 unsigned int inflight[2]);
463 void part_dec_in_flight(struct request_queue *q, struct hd_struct *part,
465 void part_inc_in_flight(struct request_queue *q, struct hd_struct *part,
468 void update_io_ticks(struct hd_struct *part, unsigned long now);
471 extern void device_add_disk(struct device *parent, struct gendisk *disk,
472 const struct attribute_group **groups);
473 static inline void add_disk(struct gendisk *disk)
475 device_add_disk(NULL, disk, NULL);
477 extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
478 static inline void add_disk_no_queue_reg(struct gendisk *disk)
480 device_add_disk_no_queue_reg(NULL, disk);
483 extern void del_gendisk(struct gendisk *gp);
484 extern struct gendisk *get_gendisk(dev_t dev, int *partno);
485 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
487 extern void set_device_ro(struct block_device *bdev, int flag);
488 extern void set_disk_ro(struct gendisk *disk, int flag);
490 static inline int get_disk_ro(struct gendisk *disk)
492 return disk->part0.policy;
495 extern void disk_block_events(struct gendisk *disk);
496 extern void disk_unblock_events(struct gendisk *disk);
497 extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
498 extern void set_capacity_revalidate_and_notify(struct gendisk *disk,
499 sector_t size, bool revalidate);
500 extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
502 /* drivers/char/random.c */
503 extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
504 extern void rand_initialize_disk(struct gendisk *disk);
506 static inline sector_t get_start_sect(struct block_device *bdev)
508 return bdev->bd_part->start_sect;
510 static inline sector_t get_capacity(struct gendisk *disk)
512 return disk->part0.nr_sects;
514 static inline void set_capacity(struct gendisk *disk, sector_t size)
516 disk->part0.nr_sects = size;
519 #ifdef CONFIG_SOLARIS_X86_PARTITION
521 #define SOLARIS_X86_NUMSLICE 16
522 #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
524 struct solaris_x86_slice {
525 __le16 s_tag; /* ID tag of partition */
526 __le16 s_flag; /* permission flags */
527 __le32 s_start; /* start sector no of partition */
528 __le32 s_size; /* # of blocks in partition */
531 struct solaris_x86_vtoc {
532 unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
533 __le32 v_sanity; /* to verify vtoc sanity */
534 __le32 v_version; /* layout version */
535 char v_volume[8]; /* volume name */
536 __le16 v_sectorsz; /* sector size in bytes */
537 __le16 v_nparts; /* number of partitions */
538 unsigned int v_reserved[10]; /* free space */
539 struct solaris_x86_slice
540 v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
541 unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
542 char v_asciilabel[128]; /* for compatibility */
545 #endif /* CONFIG_SOLARIS_X86_PARTITION */
547 #ifdef CONFIG_BSD_DISKLABEL
549 * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
550 * updated by Marc Espie <Marc.Espie@openbsd.org>
553 /* check against BSD src/sys/sys/disklabel.h for consistency */
555 #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
556 #define BSD_MAXPARTITIONS 16
557 #define OPENBSD_MAXPARTITIONS 16
558 #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
559 struct bsd_disklabel {
560 __le32 d_magic; /* the magic number */
561 __s16 d_type; /* drive type */
562 __s16 d_subtype; /* controller/d_type specific */
563 char d_typename[16]; /* type name, e.g. "eagle" */
564 char d_packname[16]; /* pack identifier */
565 __u32 d_secsize; /* # of bytes per sector */
566 __u32 d_nsectors; /* # of data sectors per track */
567 __u32 d_ntracks; /* # of tracks per cylinder */
568 __u32 d_ncylinders; /* # of data cylinders per unit */
569 __u32 d_secpercyl; /* # of data sectors per cylinder */
570 __u32 d_secperunit; /* # of data sectors per unit */
571 __u16 d_sparespertrack; /* # of spare sectors per track */
572 __u16 d_sparespercyl; /* # of spare sectors per cylinder */
573 __u32 d_acylinders; /* # of alt. cylinders per unit */
574 __u16 d_rpm; /* rotational speed */
575 __u16 d_interleave; /* hardware sector interleave */
576 __u16 d_trackskew; /* sector 0 skew, per track */
577 __u16 d_cylskew; /* sector 0 skew, per cylinder */
578 __u32 d_headswitch; /* head switch time, usec */
579 __u32 d_trkseek; /* track-to-track seek, usec */
580 __u32 d_flags; /* generic flags */
582 __u32 d_drivedata[NDDATA]; /* drive-type specific information */
584 __u32 d_spare[NSPARE]; /* reserved for future use */
585 __le32 d_magic2; /* the magic number (again) */
586 __le16 d_checksum; /* xor of data incl. partitions */
588 /* filesystem and partition information: */
589 __le16 d_npartitions; /* number of partitions in following */
590 __le32 d_bbsize; /* size of boot area at sn0, bytes */
591 __le32 d_sbsize; /* max size of fs superblock, bytes */
592 struct bsd_partition { /* the partition table */
593 __le32 p_size; /* number of sectors in partition */
594 __le32 p_offset; /* starting sector */
595 __le32 p_fsize; /* filesystem basic fragment size */
596 __u8 p_fstype; /* filesystem type, see below */
597 __u8 p_frag; /* filesystem fragments per block */
598 __le16 p_cpg; /* filesystem cylinders per group */
599 } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
602 #endif /* CONFIG_BSD_DISKLABEL */
604 #ifdef CONFIG_UNIXWARE_DISKLABEL
606 * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
607 * and Krzysztof G. Baranowski <kgb@knm.org.pl>
610 #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
611 #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
612 #define UNIXWARE_NUMSLICE 16
613 #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
615 struct unixware_slice {
616 __le16 s_label; /* label */
617 __le16 s_flags; /* permission flags */
618 __le32 start_sect; /* starting sector */
619 __le32 nr_sects; /* number of sectors in slice */
622 struct unixware_disklabel {
623 __le32 d_type; /* drive type */
624 __le32 d_magic; /* the magic number */
625 __le32 d_version; /* version number */
626 char d_serial[12]; /* serial number of the device */
627 __le32 d_ncylinders; /* # of data cylinders per device */
628 __le32 d_ntracks; /* # of tracks per cylinder */
629 __le32 d_nsectors; /* # of data sectors per track */
630 __le32 d_secsize; /* # of bytes per sector */
631 __le32 d_part_start; /* # of first sector of this partition */
632 __le32 d_unknown1[12]; /* ? */
633 __le32 d_alt_tbl; /* byte offset of alternate table */
634 __le32 d_alt_len; /* byte length of alternate table */
635 __le32 d_phys_cyl; /* # of physical cylinders per device */
636 __le32 d_phys_trk; /* # of physical tracks per cylinder */
637 __le32 d_phys_sec; /* # of physical sectors per track */
638 __le32 d_phys_bytes; /* # of physical bytes per sector */
639 __le32 d_unknown2; /* ? */
640 __le32 d_unknown3; /* ? */
641 __le32 d_pad[8]; /* pad */
643 struct unixware_vtoc {
644 __le32 v_magic; /* the magic number */
645 __le32 v_version; /* version number */
646 char v_name[8]; /* volume name */
647 __le16 v_nslices; /* # of slices */
648 __le16 v_unknown1; /* ? */
649 __le32 v_reserved[10]; /* reserved */
650 struct unixware_slice
651 v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
656 #endif /* CONFIG_UNIXWARE_DISKLABEL */
658 #ifdef CONFIG_MINIX_SUBPARTITION
659 # define MINIX_NR_SUBPARTITIONS 4
660 #endif /* CONFIG_MINIX_SUBPARTITION */
662 #define ADDPART_FLAG_NONE 0
663 #define ADDPART_FLAG_RAID 1
664 #define ADDPART_FLAG_WHOLEDISK 2
666 extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
667 extern void blk_free_devt(dev_t devt);
668 extern void blk_invalidate_devt(dev_t devt);
669 extern dev_t blk_lookup_devt(const char *name, int partno);
670 extern char *disk_name (struct gendisk *hd, int partno, char *buf);
672 int bdev_disk_changed(struct block_device *bdev, bool invalidate);
673 int blk_add_partitions(struct gendisk *disk, struct block_device *bdev);
674 int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev);
675 extern int disk_expand_part_tbl(struct gendisk *disk, int target);
676 extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
677 int partno, sector_t start,
678 sector_t len, int flags,
679 struct partition_meta_info
681 extern void __delete_partition(struct percpu_ref *);
682 extern void delete_partition(struct gendisk *, int);
683 extern void printk_all_partitions(void);
685 extern struct gendisk *__alloc_disk_node(int minors, int node_id);
686 extern struct kobject *get_disk_and_module(struct gendisk *disk);
687 extern void put_disk(struct gendisk *disk);
688 extern void put_disk_and_module(struct gendisk *disk);
689 extern void blk_register_region(dev_t devt, unsigned long range,
690 struct module *module,
691 struct kobject *(*probe)(dev_t, int *, void *),
692 int (*lock)(dev_t, void *),
694 extern void blk_unregister_region(dev_t devt, unsigned long range);
696 #define alloc_disk_node(minors, node_id) \
698 static struct lock_class_key __key; \
699 const char *__name; \
700 struct gendisk *__disk; \
702 __name = "(gendisk_completion)"#minors"("#node_id")"; \
704 __disk = __alloc_disk_node(minors, node_id); \
707 lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
712 #define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
714 static inline int hd_ref_init(struct hd_struct *part)
716 if (percpu_ref_init(&part->ref, __delete_partition, 0,
722 static inline void hd_struct_get(struct hd_struct *part)
724 percpu_ref_get(&part->ref);
727 static inline int hd_struct_try_get(struct hd_struct *part)
729 return percpu_ref_tryget_live(&part->ref);
732 static inline void hd_struct_put(struct hd_struct *part)
734 percpu_ref_put(&part->ref);
737 static inline void hd_struct_kill(struct hd_struct *part)
739 percpu_ref_kill(&part->ref);
742 static inline void hd_free_part(struct hd_struct *part)
744 free_part_stats(part);
746 percpu_ref_exit(&part->ref);
750 * Any access of part->nr_sects which is not protected by partition
751 * bd_mutex or gendisk bdev bd_mutex, should be done using this
754 * Code written along the lines of i_size_read() and i_size_write().
755 * CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption
758 static inline sector_t part_nr_sects_read(struct hd_struct *part)
760 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
764 seq = read_seqcount_begin(&part->nr_sects_seq);
765 nr_sects = part->nr_sects;
766 } while (read_seqcount_retry(&part->nr_sects_seq, seq));
768 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
772 nr_sects = part->nr_sects;
776 return part->nr_sects;
781 * Should be called with mutex lock held (typically bd_mutex) of partition
782 * to provide mutual exlusion among writers otherwise seqcount might be
783 * left in wrong state leaving the readers spinning infinitely.
785 static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
787 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
788 write_seqcount_begin(&part->nr_sects_seq);
789 part->nr_sects = size;
790 write_seqcount_end(&part->nr_sects_seq);
791 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
793 part->nr_sects = size;
796 part->nr_sects = size;
800 #if defined(CONFIG_BLK_DEV_INTEGRITY)
801 extern void blk_integrity_add(struct gendisk *);
802 extern void blk_integrity_del(struct gendisk *);
803 #else /* CONFIG_BLK_DEV_INTEGRITY */
804 static inline void blk_integrity_add(struct gendisk *disk) { }
805 static inline void blk_integrity_del(struct gendisk *disk) { }
806 #endif /* CONFIG_BLK_DEV_INTEGRITY */
808 #else /* CONFIG_BLOCK */
810 static inline void printk_all_partitions(void) { }
812 static inline dev_t blk_lookup_devt(const char *name, int partno)
814 dev_t devt = MKDEV(0, 0);
817 #endif /* CONFIG_BLOCK */
819 #endif /* _LINUX_GENHD_H */