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Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 412 |
1 files changed, 0 insertions, 412 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h deleted file mode 100644 index 38f23d757013..000000000000 --- a/include/linux/genhd.h +++ /dev/null @@ -1,412 +0,0 @@ -/* 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> - -#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) -#define dev_to_part(device) container_of((device), struct hd_struct, __dev) -#define disk_to_dev(disk) (&(disk)->part0.__dev) -#define part_to_dev(part) (&((part)->__dev)) - -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]; -}; - -struct hd_struct { - sector_t start_sect; - /* - * nr_sects is protected by sequence counter. One might extend a - * partition while IO is happening to it and update of nr_sects - * can be non-atomic on 32bit machines with 64bit sector_t. - */ - sector_t nr_sects; -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - seqcount_t nr_sects_seq; -#endif - unsigned long stamp; - struct disk_stats __percpu *dkstats; - struct percpu_ref ref; - - struct device __dev; - struct kobject *holder_dir; - int policy, partno; - struct partition_meta_info *info; -#ifdef CONFIG_FAIL_MAKE_REQUEST - int make_it_fail; -#endif - struct rcu_work rcu_work; -}; - -/** - * 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 hd_struct __rcu *last_lookup; - struct hd_struct __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 hd_struct 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 rw_semaphore lookup_sem; - 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; -}; - -#if IS_REACHABLE(CONFIG_CDROM) -#define disk_to_cdi(disk) ((disk)->cdi) -#else -#define disk_to_cdi(disk) NULL -#endif - -static inline struct gendisk *part_to_disk(struct hd_struct *part) -{ - if (likely(part)) { - if (part->partno) - return dev_to_disk(part_to_dev(part)->parent); - else - return dev_to_disk(part_to_dev(part)); - } - return NULL; -} - -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); -} - -static inline dev_t part_devt(struct hd_struct *part) -{ - return part_to_dev(part)->devt; -} - -extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); -extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); - -static inline void disk_put_part(struct hd_struct *part) -{ - if (likely(part)) - put_device(part_to_dev(part)); -} - -static inline void hd_sects_seq_init(struct hd_struct *p) -{ -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - seqcount_init(&p->nr_sects_seq); -#endif -} - -/* - * 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 hd_struct *part; - int idx; - unsigned int flags; -}; - -extern void disk_part_iter_init(struct disk_part_iter *piter, - struct gendisk *disk, unsigned int flags); -extern struct hd_struct *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 gendisk *get_gendisk(dev_t dev, int *partno); -extern struct block_device *bdget_disk(struct gendisk *disk, int partno); - -extern void set_device_ro(struct block_device *bdev, int flag); -extern void set_disk_ro(struct gendisk *disk, int flag); - -static inline int get_disk_ro(struct gendisk *disk) -{ - return disk->part0.policy; -} - -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); -void set_capacity_revalidate_and_notify(struct gendisk *disk, sector_t size, - bool update_bdev); - -/* 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_part->start_sect; -} -static inline sector_t get_capacity(struct gendisk *disk) -{ - return disk->part0.nr_sects; -} -static inline void set_capacity(struct gendisk *disk, sector_t size) -{ - disk->part0.nr_sects = size; -} - -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 struct kobject *get_disk_and_module(struct gendisk *disk); -extern void put_disk(struct gendisk *disk); -extern void put_disk_and_module(struct gendisk *disk); -extern void blk_register_region(dev_t devt, unsigned long range, - struct module *module, - struct kobject *(*probe)(dev_t, int *, void *), - int (*lock)(dev_t, void *), - void *data); -extern void blk_unregister_region(dev_t devt, unsigned long range); - -#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 unregister_blkdev(unsigned int major, const char *name); - -void revalidate_disk_size(struct gendisk *disk, bool verbose); -bool bdev_check_media_change(struct block_device *bdev); -int __invalidate_device(struct block_device *bdev, bool kill_dirty); -void bd_set_nr_sectors(struct block_device *bdev, sector_t sectors); - -/* 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 */ - -#ifdef CONFIG_BLOCK -void printk_all_partitions(void); -dev_t blk_lookup_devt(const char *name, int partno); -#else /* CONFIG_BLOCK */ -static inline void printk_all_partitions(void) -{ -} -static inline dev_t blk_lookup_devt(const char *name, int partno) -{ - dev_t devt = MKDEV(0, 0); - return devt; -} -#endif /* CONFIG_BLOCK */ - -#endif /* _LINUX_GENHD_H */ |