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- /* 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 <linux/android_kabi.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;
- ANDROID_KABI_RESERVE(1);
- ANDROID_KABI_RESERVE(2);
- ANDROID_KABI_RESERVE(3);
- ANDROID_KABI_RESERVE(4);
- };
- /**
- * 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;
- ANDROID_KABI_RESERVE(1);
- ANDROID_KABI_RESERVE(2);
- };
- 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;
- ANDROID_KABI_RESERVE(1);
- ANDROID_KABI_RESERVE(2);
- ANDROID_KABI_RESERVE(3);
- ANDROID_KABI_RESERVE(4);
- };
- #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);
- bool 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 */
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