[mirror_ubuntu-jammy-kernel.git] / include / linux / genhd.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_GENHD_H
#define _LINUX_GENHD_H

/*
 * 	genhd.h Copyright (C) 1992 Drew Eckhardt
 *	Generic hard disk header file by  
 * 		Drew Eckhardt
 *
 *		<drew@colorado.edu>
 */

#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <linux/percpu-refcount.h>
#include <linux/uuid.h>
#include <linux/blk_types.h>
#include <asm/local.h>

extern const struct device_type disk_type;
extern struct device_type part_type;
extern struct class block_class;

#define DISK_MAX_PARTS			256
#define DISK_NAME_LEN			32

#include <linux/major.h>
#include <linux/device.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/workqueue.h>

#define PARTITION_META_INFO_VOLNAMELTH	64
/*
 * Enough for the string representation of any kind of UUID plus NULL.
 * EFI UUID is 36 characters. MSDOS UUID is 11 characters.
 */
#define PARTITION_META_INFO_UUIDLTH	(UUID_STRING_LEN + 1)

struct partition_meta_info {
	char uuid[PARTITION_META_INFO_UUIDLTH];
	u8 volname[PARTITION_META_INFO_VOLNAMELTH];
};

/**
 * DOC: genhd capability flags
 *
 * ``GENHD_FL_REMOVABLE`` (0x0001): indicates that the block device
 * gives access to removable media.
 * When set, the device remains present even when media is not
 * inserted.
 * Must not be set for devices which are removed entirely when the
 * media is removed.
 *
 * ``GENHD_FL_CD`` (0x0008): the block device is a CD-ROM-style
 * device.
 * Affects responses to the ``CDROM_GET_CAPABILITY`` ioctl.
 *
 * ``GENHD_FL_UP`` (0x0010): indicates that the block device is "up",
 * with a similar meaning to network interfaces.
 *
 * ``GENHD_FL_SUPPRESS_PARTITION_INFO`` (0x0020): don't include
 * partition information in ``/proc/partitions`` or in the output of
 * printk_all_partitions().
 * Used for the null block device and some MMC devices.
 *
 * ``GENHD_FL_EXT_DEVT`` (0x0040): the driver supports extended
 * dynamic ``dev_t``, i.e. it wants extended device numbers
 * (``BLOCK_EXT_MAJOR``).
 * This affects the maximum number of partitions.
 *
 * ``GENHD_FL_NATIVE_CAPACITY`` (0x0080): based on information in the
 * partition table, the device's capacity has been extended to its
 * native capacity; i.e. the device has hidden capacity used by one
 * of the partitions (this is a flag used so that native capacity is
 * only ever unlocked once).
 *
 * ``GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE`` (0x0100): event polling is
 * blocked whenever a writer holds an exclusive lock.
 *
 * ``GENHD_FL_NO_PART_SCAN`` (0x0200): partition scanning is disabled.
 * Used for loop devices in their default settings and some MMC
 * devices.
 *
 * ``GENHD_FL_HIDDEN`` (0x0400): the block device is hidden; it
 * doesn't produce events, doesn't appear in sysfs, and doesn't have
 * an associated ``bdev``.
 * Implies ``GENHD_FL_SUPPRESS_PARTITION_INFO`` and
 * ``GENHD_FL_NO_PART_SCAN``.
 * Used for multipath devices.
 */
#define GENHD_FL_REMOVABLE			0x0001
/* 2 is unused (used to be GENHD_FL_DRIVERFS) */
/* 4 is unused (used to be GENHD_FL_MEDIA_CHANGE_NOTIFY) */
#define GENHD_FL_CD				0x0008
#define GENHD_FL_UP				0x0010
#define GENHD_FL_SUPPRESS_PARTITION_INFO	0x0020
#define GENHD_FL_EXT_DEVT			0x0040
#define GENHD_FL_NATIVE_CAPACITY		0x0080
#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE	0x0100
#define GENHD_FL_NO_PART_SCAN			0x0200
#define GENHD_FL_HIDDEN				0x0400

enum {
	DISK_EVENT_MEDIA_CHANGE			= 1 << 0, /* media changed */
	DISK_EVENT_EJECT_REQUEST		= 1 << 1, /* eject requested */
};

enum {
	/* Poll even if events_poll_msecs is unset */
	DISK_EVENT_FLAG_POLL			= 1 << 0,
	/* Forward events to udev */
	DISK_EVENT_FLAG_UEVENT			= 1 << 1,
};

struct disk_part_tbl {
	struct rcu_head rcu_head;
	int len;
	struct block_device __rcu *last_lookup;
	struct block_device __rcu *part[];
};

struct disk_events;
struct badblocks;

struct blk_integrity {
	const struct blk_integrity_profile	*profile;
	unsigned char				flags;
	unsigned char				tuple_size;
	unsigned char				interval_exp;
	unsigned char				tag_size;
};

struct gendisk {
	/* major, first_minor and minors are input parameters only,
	 * don't use directly.  Use disk_devt() and disk_max_parts().
	 */
	int major;			/* major number of driver */
	int first_minor;
	int minors;                     /* maximum number of minors, =1 for
                                         * disks that can't be partitioned. */

	char disk_name[DISK_NAME_LEN];	/* name of major driver */

	unsigned short events;		/* supported events */
	unsigned short event_flags;	/* flags related to event processing */

	/* Array of pointers to partitions indexed by partno.
	 * Protected with matching bdev lock but stat and other
	 * non-critical accesses use RCU.  Always access through
	 * helpers.
	 */
	struct disk_part_tbl __rcu *part_tbl;
	struct block_device *part0;

	const struct block_device_operations *fops;
	struct request_queue *queue;
	void *private_data;

	int flags;
	unsigned long state;
#define GD_NEED_PART_SCAN		0
	struct kobject *slave_dir;

	struct timer_rand_state *random;
	atomic_t sync_io;		/* RAID */
	struct disk_events *ev;
#ifdef  CONFIG_BLK_DEV_INTEGRITY
	struct kobject integrity_kobj;
#endif	/* CONFIG_BLK_DEV_INTEGRITY */
#if IS_ENABLED(CONFIG_CDROM)
	struct cdrom_device_info *cdi;
#endif
	int node_id;
	struct badblocks *bb;
	struct lockdep_map lockdep_map;
};

/*
 * The gendisk is refcounted by the part0 block_device, and the bd_device
 * therein is also used for device model presentation in sysfs.
 */
#define dev_to_disk(device) \
	(dev_to_bdev(device)->bd_disk)
#define disk_to_dev(disk) \
	(&((disk)->part0->bd_device))

#if IS_REACHABLE(CONFIG_CDROM)
#define disk_to_cdi(disk)	((disk)->cdi)
#else
#define disk_to_cdi(disk)	NULL
#endif

static inline int disk_max_parts(struct gendisk *disk)
{
	if (disk->flags & GENHD_FL_EXT_DEVT)
		return DISK_MAX_PARTS;
	return disk->minors;
}

static inline bool disk_part_scan_enabled(struct gendisk *disk)
{
	return disk_max_parts(disk) > 1 &&
		!(disk->flags & GENHD_FL_NO_PART_SCAN);
}

static inline dev_t disk_devt(struct gendisk *disk)
{
	return MKDEV(disk->major, disk->first_minor);
}

/*
 * Smarter partition iterator without context limits.
 */
#define DISK_PITER_REVERSE	(1 << 0) /* iterate in the reverse direction */
#define DISK_PITER_INCL_EMPTY	(1 << 1) /* include 0-sized parts */
#define DISK_PITER_INCL_PART0	(1 << 2) /* include partition 0 */
#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */

struct disk_part_iter {
	struct gendisk		*disk;
	struct block_device	*part;
	int			idx;
	unsigned int		flags;
};

extern void disk_part_iter_init(struct disk_part_iter *piter,
				 struct gendisk *disk, unsigned int flags);
struct block_device *disk_part_iter_next(struct disk_part_iter *piter);
extern void disk_part_iter_exit(struct disk_part_iter *piter);
extern bool disk_has_partitions(struct gendisk *disk);

/* block/genhd.c */
extern void device_add_disk(struct device *parent, struct gendisk *disk,
			    const struct attribute_group **groups);
static inline void add_disk(struct gendisk *disk)
{
	device_add_disk(NULL, disk, NULL);
}
extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
static inline void add_disk_no_queue_reg(struct gendisk *disk)
{
	device_add_disk_no_queue_reg(NULL, disk);
}

extern void del_gendisk(struct gendisk *gp);
extern struct block_device *bdget_disk(struct gendisk *disk, int partno);

extern void set_disk_ro(struct gendisk *disk, int flag);

static inline int get_disk_ro(struct gendisk *disk)
{
	return disk->part0->bd_read_only;
}

extern void disk_block_events(struct gendisk *disk);
extern void disk_unblock_events(struct gendisk *disk);
extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
bool set_capacity_and_notify(struct gendisk *disk, sector_t size);

/* drivers/char/random.c */
extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
extern void rand_initialize_disk(struct gendisk *disk);

static inline sector_t get_start_sect(struct block_device *bdev)
{
	return bdev->bd_start_sect;
}

static inline sector_t bdev_nr_sectors(struct block_device *bdev)
{
	return i_size_read(bdev->bd_inode) >> 9;
}

static inline sector_t get_capacity(struct gendisk *disk)
{
	return bdev_nr_sectors(disk->part0);
}

int bdev_disk_changed(struct block_device *bdev, bool invalidate);
int blk_add_partitions(struct gendisk *disk, struct block_device *bdev);
int blk_drop_partitions(struct block_device *bdev);

extern struct gendisk *__alloc_disk_node(int minors, int node_id);
extern void put_disk(struct gendisk *disk);

#define alloc_disk_node(minors, node_id)				\
({									\
	static struct lock_class_key __key;				\
	const char *__name;						\
	struct gendisk *__disk;						\
									\
	__name = "(gendisk_completion)"#minors"("#node_id")";		\
									\
	__disk = __alloc_disk_node(minors, node_id);			\
									\
	if (__disk)							\
		lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
									\
	__disk;								\
})

#define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)

int __register_blkdev(unsigned int major, const char *name,
		void (*probe)(dev_t devt));
#define register_blkdev(major, name) \
	__register_blkdev(major, name, NULL)
void unregister_blkdev(unsigned int major, const char *name);

bool bdev_check_media_change(struct block_device *bdev);
int __invalidate_device(struct block_device *bdev, bool kill_dirty);
void set_capacity(struct gendisk *disk, sector_t size);

/* for drivers/char/raw.c: */
int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);

#ifdef CONFIG_SYSFS
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
#else
static inline int bd_link_disk_holder(struct block_device *bdev,
				      struct gendisk *disk)
{
	return 0;
}
static inline void bd_unlink_disk_holder(struct block_device *bdev,
					 struct gendisk *disk)
{
}
#endif /* CONFIG_SYSFS */

extern struct rw_semaphore bdev_lookup_sem;

dev_t blk_lookup_devt(const char *name, int partno);
void blk_request_module(dev_t devt);
#ifdef CONFIG_BLOCK
void printk_all_partitions(void);
#else /* CONFIG_BLOCK */
static inline void printk_all_partitions(void)
{
}
#endif /* CONFIG_BLOCK */

#endif /* _LINUX_GENHD_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_GENHD_H
	3	#define _LINUX_GENHD_H
	4
	5	/*
	6	* genhd.h Copyright (C) 1992 Drew Eckhardt
	7	* Generic hard disk header file by
	8	* Drew Eckhardt
	9	*
	10	* <drew@colorado.edu>
	11	*/
	12
1da177e4	13	#include <linux/types.h>
edfaa7c3	14	#include <linux/kdev_t.h>
e71bf0d0	15	#include <linux/rcupdate.h>
6d1d8050	16	#include <linux/slab.h>
6c71013e	17	#include <linux/percpu-refcount.h>
63579785	18	#include <linux/uuid.h>
dbae2c55	19	#include <linux/blk_types.h>
1226b8dd	20	#include <asm/local.h>
1da177e4	21
ef45fe47	22	extern const struct device_type disk_type;
edfaa7c3	23	extern struct device_type part_type;
edfaa7c3 KS	24	extern struct class block_class;
edfaa7c3 KS	25
689d6fac	26	#define DISK_MAX_PARTS 256
3e1a7ff8	27	#define DISK_NAME_LEN 32
689d6fac	28
34186efc DW	29	#include <linux/major.h>
	30	#include <linux/device.h>
	31	#include <linux/smp.h>
	32	#include <linux/string.h>
	33	#include <linux/fs.h>
8ce7ad7b	34	#include <linux/workqueue.h>
34186efc	35
6d1d8050	36	#define PARTITION_META_INFO_VOLNAMELTH 64
1ad7e899 SW	37	/*
	38	* Enough for the string representation of any kind of UUID plus NULL.
	39	* EFI UUID is 36 characters. MSDOS UUID is 11 characters.
	40	*/
63579785	41	#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
6d1d8050 WD	42
6d1d8050 WD	43	struct partition_meta_info {
1ad7e899	44	char uuid[PARTITION_META_INFO_UUIDLTH];
6d1d8050 WD	45	u8 volname[PARTITION_META_INFO_VOLNAMELTH];
	46	};
	47
9243c6f3 SK	48	/**
	49	* DOC: genhd capability flags
	50	*
	51	* ``GENHD_FL_REMOVABLE`` (0x0001): indicates that the block device
	52	* gives access to removable media.
	53	* When set, the device remains present even when media is not
	54	* inserted.
	55	* Must not be set for devices which are removed entirely when the
	56	* media is removed.
	57	*
	58	* ``GENHD_FL_CD`` (0x0008): the block device is a CD-ROM-style
	59	* device.
	60	* Affects responses to the ``CDROM_GET_CAPABILITY`` ioctl.
	61	*
	62	* ``GENHD_FL_UP`` (0x0010): indicates that the block device is "up",
	63	* with a similar meaning to network interfaces.
	64	*
	65	* ``GENHD_FL_SUPPRESS_PARTITION_INFO`` (0x0020): don't include
	66	* partition information in ``/proc/partitions`` or in the output of
	67	* printk_all_partitions().
	68	* Used for the null block device and some MMC devices.
	69	*
	70	* ``GENHD_FL_EXT_DEVT`` (0x0040): the driver supports extended
	71	* dynamic ``dev_t``, i.e. it wants extended device numbers
	72	* (``BLOCK_EXT_MAJOR``).
	73	* This affects the maximum number of partitions.
	74	*
	75	* ``GENHD_FL_NATIVE_CAPACITY`` (0x0080): based on information in the
	76	* partition table, the device's capacity has been extended to its
	77	* native capacity; i.e. the device has hidden capacity used by one
	78	* of the partitions (this is a flag used so that native capacity is
	79	* only ever unlocked once).
	80	*
	81	* ``GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE`` (0x0100): event polling is
	82	* blocked whenever a writer holds an exclusive lock.
	83	*
	84	* ``GENHD_FL_NO_PART_SCAN`` (0x0200): partition scanning is disabled.
	85	* Used for loop devices in their default settings and some MMC
	86	* devices.
	87	*
	88	* ``GENHD_FL_HIDDEN`` (0x0400): the block device is hidden; it
	89	* doesn't produce events, doesn't appear in sysfs, and doesn't have
	90	* an associated ``bdev``.
	91	* Implies ``GENHD_FL_SUPPRESS_PARTITION_INFO`` and
	92	* ``GENHD_FL_NO_PART_SCAN``.
	93	* Used for multipath devices.
	94	*/
	95	#define GENHD_FL_REMOVABLE 0x0001
	96	/* 2 is unused (used to be GENHD_FL_DRIVERFS) */
	97	/* 4 is unused (used to be GENHD_FL_MEDIA_CHANGE_NOTIFY) */
	98	#define GENHD_FL_CD 0x0008
	99	#define GENHD_FL_UP 0x0010
	100	#define GENHD_FL_SUPPRESS_PARTITION_INFO 0x0020
	101	#define GENHD_FL_EXT_DEVT 0x0040
	102	#define GENHD_FL_NATIVE_CAPACITY 0x0080
	103	#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 0x0100
	104	#define GENHD_FL_NO_PART_SCAN 0x0200
	105	#define GENHD_FL_HIDDEN 0x0400
1da177e4	106
77ea887e TH	107	enum {
	108	DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
	109	DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
	110	};
	111
c92e2f04 MW	112	enum {
	113	/* Poll even if events_poll_msecs is unset */
	114	DISK_EVENT_FLAG_POLL = 1 << 0,
	115	/* Forward events to udev */
	116	DISK_EVENT_FLAG_UEVENT = 1 << 1,
	117	};
	118
540eed56 TH	119	struct disk_part_tbl {
	120	struct rcu_head rcu_head;
	121	int len;
8446fe92 CH	122	struct block_device __rcu *last_lookup;
8446fe92 CH	123	struct block_device __rcu *part[];
540eed56 TH	124	};
540eed56 TH	125
77ea887e	126	struct disk_events;
99e6608c	127	struct badblocks;
77ea887e	128
25520d55	129	struct blk_integrity {
869ab90f EB	130	const struct blk_integrity_profile *profile;
	131	unsigned char flags;
	132	unsigned char tuple_size;
	133	unsigned char interval_exp;
	134	unsigned char tag_size;
25520d55 MP	135	};
25520d55 MP	136
1da177e4	137	struct gendisk {
689d6fac TH	138	/* major, first_minor and minors are input parameters only,
689d6fac TH	139	* don't use directly. Use disk_devt() and disk_max_parts().
f331c029	140	*/
1da177e4 LT	141	int major; /* major number of driver */
	142	int first_minor;
	143	int minors; /* maximum number of minors, =1 for
	144	* disks that can't be partitioned. */
f331c029	145
3e1a7ff8	146	char disk_name[DISK_NAME_LEN]; /* name of major driver */
77ea887e	147
c92e2f04 MW	148	unsigned short events; /* supported events */
c92e2f04 MW	149	unsigned short event_flags; /* flags related to event processing */
77ea887e	150
b5d0b9df	151	/* Array of pointers to partitions indexed by partno.
e71bf0d0 TH	152	* Protected with matching bdev lock but stat and other
	153	* non-critical accesses use RCU. Always access through
	154	* helpers.
	155	*/
4d2deb40	156	struct disk_part_tbl __rcu *part_tbl;
cb8432d6	157	struct block_device *part0;
e71bf0d0	158
83d5cde4	159	const struct block_device_operations *fops;
1da177e4 LT	160	struct request_queue *queue;
1da177e4 LT	161	void *private_data;
1da177e4 LT	162
1da177e4 LT	163	int flags;
38430f08 CH	164	unsigned long state;
38430f08 CH	165	#define GD_NEED_PART_SCAN 0
6a4d44c1	166	struct kobject *slave_dir;
1da177e4 LT	167
1da177e4 LT	168	struct timer_rand_state *random;
1da177e4	169	atomic_t sync_io; /* RAID */
77ea887e	170	struct disk_events *ev;
7ba1ba12	171	#ifdef CONFIG_BLK_DEV_INTEGRITY
aff34e19	172	struct kobject integrity_kobj;
25520d55	173	#endif /* CONFIG_BLK_DEV_INTEGRITY */
a711d91c CH	174	#if IS_ENABLED(CONFIG_CDROM)
	175	struct cdrom_device_info *cdi;
	176	#endif
540eed56	177	int node_id;
99e6608c	178	struct badblocks *bb;
e319e1fb	179	struct lockdep_map lockdep_map;
1da177e4 LT	180	};
1da177e4 LT	181
0d02129e CH	182	/*
	183	* The gendisk is refcounted by the part0 block_device, and the bd_device
	184	* therein is also used for device model presentation in sysfs.
	185	*/
	186	#define dev_to_disk(device) \
	187	(dev_to_bdev(device)->bd_disk)
	188	#define disk_to_dev(disk) \
	189	(&((disk)->part0->bd_device))
	190
a711d91c CH	191	#if IS_REACHABLE(CONFIG_CDROM)
	192	#define disk_to_cdi(disk) ((disk)->cdi)
	193	#else
	194	#define disk_to_cdi(disk) NULL
	195	#endif
	196
f331c029 TH	197	static inline int disk_max_parts(struct gendisk *disk)
f331c029 TH	198	{
689d6fac TH	199	if (disk->flags & GENHD_FL_EXT_DEVT)
	200	return DISK_MAX_PARTS;
	201	return disk->minors;
b5d0b9df TH	202	}
b5d0b9df TH	203
d27769ec	204	static inline bool disk_part_scan_enabled(struct gendisk *disk)
b5d0b9df	205	{
d27769ec TH	206	return disk_max_parts(disk) > 1 &&
d27769ec TH	207	!(disk->flags & GENHD_FL_NO_PART_SCAN);
f331c029 TH	208	}
	209
	210	static inline dev_t disk_devt(struct gendisk *disk)
	211	{
517bf3c3	212	return MKDEV(disk->major, disk->first_minor);
f331c029 TH	213	}
f331c029 TH	214
e71bf0d0 TH	215	/*
	216	* Smarter partition iterator without context limits.
	217	*/
	218	#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
	219	#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
b5d0b9df	220	#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
71982a40	221	#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
e71bf0d0 TH	222
	223	struct disk_part_iter {
	224	struct gendisk *disk;
ad1eaa53	225	struct block_device *part;
e71bf0d0 TH	226	int idx;
	227	unsigned int flags;
	228	};
	229
	230	extern void disk_part_iter_init(struct disk_part_iter *piter,
	231	struct gendisk *disk, unsigned int flags);
ad1eaa53	232	struct block_device disk_part_iter_next(struct disk_part_iter piter);
e71bf0d0	233	extern void disk_part_iter_exit(struct disk_part_iter *piter);
10f36b1e	234	extern bool disk_has_partitions(struct gendisk *disk);
1da177e4	235
32ca163c	236	/* block/genhd.c */
fef912bf HR	237	extern void device_add_disk(struct device parent, struct gendisk disk,
fef912bf HR	238	const struct attribute_group **groups);
e63a46be DW	239	static inline void add_disk(struct gendisk *disk)
e63a46be DW	240	{
fef912bf	241	device_add_disk(NULL, disk, NULL);
e63a46be	242	}
fa70d2e2 MS	243	extern void device_add_disk_no_queue_reg(struct device parent, struct gendisk disk);
	244	static inline void add_disk_no_queue_reg(struct gendisk *disk)
	245	{
	246	device_add_disk_no_queue_reg(NULL, disk);
	247	}
e63a46be	248
1da177e4	249	extern void del_gendisk(struct gendisk *gp);
f331c029	250	extern struct block_device bdget_disk(struct gendisk disk, int partno);
1da177e4	251
1da177e4 LT	252	extern void set_disk_ro(struct gendisk *disk, int flag);
1da177e4 LT	253
b7db9956 TH	254	static inline int get_disk_ro(struct gendisk *disk)
b7db9956 TH	255	{
cb8432d6	256	return disk->part0->bd_read_only;
b7db9956 TH	257	}
b7db9956 TH	258
77ea887e TH	259	extern void disk_block_events(struct gendisk *disk);
77ea887e TH	260	extern void disk_unblock_events(struct gendisk *disk);
85ef06d1	261	extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
449f4ec9	262	bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
77ea887e	263
1da177e4	264	/* drivers/char/random.c */
0766f788	265	extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
1da177e4 LT	266	extern void rand_initialize_disk(struct gendisk *disk);
	267
	268	static inline sector_t get_start_sect(struct block_device *bdev)
	269	{
29ff57c6	270	return bdev->bd_start_sect;
1da177e4	271	}
a782483c CH	272
a782483c CH	273	static inline sector_t bdev_nr_sectors(struct block_device *bdev)
1da177e4	274	{
a782483c	275	return i_size_read(bdev->bd_inode) >> 9;
1da177e4	276	}
a782483c CH	277
a782483c CH	278	static inline sector_t get_capacity(struct gendisk *disk)
1da177e4	279	{
cb8432d6	280	return bdev_nr_sectors(disk->part0);
1da177e4 LT	281	}
1da177e4 LT	282
142fe8f4	283	int bdev_disk_changed(struct block_device *bdev, bool invalidate);
a1548b67	284	int blk_add_partitions(struct gendisk disk, struct block_device bdev);
d46430bf	285	int blk_drop_partitions(struct block_device *bdev);
1da177e4	286
e319e1fb	287	extern struct gendisk *__alloc_disk_node(int minors, int node_id);
1da177e4	288	extern void put_disk(struct gendisk *disk);
1da177e4	289
e319e1fb BP	290	#define alloc_disk_node(minors, node_id) \
	291	({ \
	292	static struct lock_class_key __key; \
	293	const char *__name; \
	294	struct gendisk *__disk; \
	295	\
	296	__name = "(gendisk_completion)"#minors"("#node_id")"; \
	297	\
	298	__disk = __alloc_disk_node(minors, node_id); \
	299	\
	300	if (__disk) \
	301	lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
	302	\
	303	__disk; \
	304	})
	305
	306	#define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
	307
a160c615 CH	308	int __register_blkdev(unsigned int major, const char *name,
	309	void (*probe)(dev_t devt));
	310	#define register_blkdev(major, name) \
	311	__register_blkdev(major, name, NULL)
3f1266f1 CH	312	void unregister_blkdev(unsigned int major, const char *name);
3f1266f1 CH	313
95f6f3a4	314	bool bdev_check_media_change(struct block_device *bdev);
3f1266f1	315	int __invalidate_device(struct block_device *bdev, bool kill_dirty);
a782483c	316	void set_capacity(struct gendisk *disk, sector_t size);
3f1266f1 CH	317
	318	/* for drivers/char/raw.c: */
	319	int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
	320	long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
	321
	322	#ifdef CONFIG_SYSFS
	323	int bd_link_disk_holder(struct block_device bdev, struct gendisk disk);
	324	void bd_unlink_disk_holder(struct block_device bdev, struct gendisk disk);
	325	#else
	326	static inline int bd_link_disk_holder(struct block_device *bdev,
	327	struct gendisk *disk)
	328	{
	329	return 0;
	330	}
	331	static inline void bd_unlink_disk_holder(struct block_device *bdev,
	332	struct gendisk *disk)
	333	{
	334	}
	335	#endif /* CONFIG_SYSFS */
	336
22ae8ce8 CH	337	extern struct rw_semaphore bdev_lookup_sem;
22ae8ce8 CH	338
c2637e80	339	dev_t blk_lookup_devt(const char *name, int partno);
22ae8ce8	340	void blk_request_module(dev_t devt);
1a4dcfa8 CH	341	#ifdef CONFIG_BLOCK
1a4dcfa8 CH	342	void printk_all_partitions(void);
87c1efbf	343	#else /* CONFIG_BLOCK */
1a4dcfa8 CH	344	static inline void printk_all_partitions(void)
	345	{
	346	}
87c1efbf	347	#endif /* CONFIG_BLOCK */
9361401e	348
a8ae50ba	349	#endif /* _LINUX_GENHD_H */