386 lines
11 KiB
C
386 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_GENHD_H
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#define _LINUX_GENHD_H
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/*
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* genhd.h Copyright (C) 1992 Drew Eckhardt
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* Generic hard disk header file by
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* Drew Eckhardt
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*
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* <drew@colorado.edu>
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*/
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/rcupdate.h>
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#include <linux/slab.h>
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#include <linux/percpu-refcount.h>
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#include <linux/uuid.h>
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#include <linux/blk_types.h>
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#include <asm/local.h>
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#ifdef CONFIG_BLOCK
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#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
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#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
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#define disk_to_dev(disk) (&(disk)->part0.__dev)
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#define part_to_dev(part) (&((part)->__dev))
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extern struct device_type part_type;
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extern struct class block_class;
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#define DISK_MAX_PARTS 256
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#define DISK_NAME_LEN 32
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#include <linux/major.h>
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#include <linux/device.h>
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#include <linux/smp.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/workqueue.h>
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struct disk_stats {
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u64 nsecs[NR_STAT_GROUPS];
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unsigned long sectors[NR_STAT_GROUPS];
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unsigned long ios[NR_STAT_GROUPS];
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unsigned long merges[NR_STAT_GROUPS];
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unsigned long io_ticks;
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local_t in_flight[2];
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};
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#define PARTITION_META_INFO_VOLNAMELTH 64
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/*
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* Enough for the string representation of any kind of UUID plus NULL.
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* EFI UUID is 36 characters. MSDOS UUID is 11 characters.
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*/
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#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
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struct partition_meta_info {
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char uuid[PARTITION_META_INFO_UUIDLTH];
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u8 volname[PARTITION_META_INFO_VOLNAMELTH];
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};
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struct hd_struct {
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sector_t start_sect;
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/*
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* nr_sects is protected by sequence counter. One might extend a
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* partition while IO is happening to it and update of nr_sects
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* can be non-atomic on 32bit machines with 64bit sector_t.
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*/
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sector_t nr_sects;
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seqcount_t nr_sects_seq;
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sector_t alignment_offset;
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unsigned int discard_alignment;
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struct device __dev;
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struct kobject *holder_dir;
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int policy, partno;
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struct partition_meta_info *info;
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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int make_it_fail;
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#endif
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unsigned long stamp;
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#ifdef CONFIG_SMP
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struct disk_stats __percpu *dkstats;
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#else
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struct disk_stats dkstats;
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#endif
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struct percpu_ref ref;
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struct rcu_work rcu_work;
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};
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/**
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* DOC: genhd capability flags
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*
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* ``GENHD_FL_REMOVABLE`` (0x0001): indicates that the block device
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* gives access to removable media.
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* When set, the device remains present even when media is not
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* inserted.
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* Must not be set for devices which are removed entirely when the
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* media is removed.
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*
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* ``GENHD_FL_CD`` (0x0008): the block device is a CD-ROM-style
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* device.
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* Affects responses to the ``CDROM_GET_CAPABILITY`` ioctl.
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*
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* ``GENHD_FL_UP`` (0x0010): indicates that the block device is "up",
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* with a similar meaning to network interfaces.
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*
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* ``GENHD_FL_SUPPRESS_PARTITION_INFO`` (0x0020): don't include
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* partition information in ``/proc/partitions`` or in the output of
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* printk_all_partitions().
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* Used for the null block device and some MMC devices.
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*
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* ``GENHD_FL_EXT_DEVT`` (0x0040): the driver supports extended
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* dynamic ``dev_t``, i.e. it wants extended device numbers
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* (``BLOCK_EXT_MAJOR``).
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* This affects the maximum number of partitions.
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*
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* ``GENHD_FL_NATIVE_CAPACITY`` (0x0080): based on information in the
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* partition table, the device's capacity has been extended to its
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* native capacity; i.e. the device has hidden capacity used by one
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* of the partitions (this is a flag used so that native capacity is
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* only ever unlocked once).
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*
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* ``GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE`` (0x0100): event polling is
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* blocked whenever a writer holds an exclusive lock.
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*
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* ``GENHD_FL_NO_PART_SCAN`` (0x0200): partition scanning is disabled.
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* Used for loop devices in their default settings and some MMC
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* devices.
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*
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* ``GENHD_FL_HIDDEN`` (0x0400): the block device is hidden; it
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* doesn't produce events, doesn't appear in sysfs, and doesn't have
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* an associated ``bdev``.
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* Implies ``GENHD_FL_SUPPRESS_PARTITION_INFO`` and
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* ``GENHD_FL_NO_PART_SCAN``.
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* Used for multipath devices.
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*/
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#define GENHD_FL_REMOVABLE 0x0001
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/* 2 is unused (used to be GENHD_FL_DRIVERFS) */
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/* 4 is unused (used to be GENHD_FL_MEDIA_CHANGE_NOTIFY) */
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#define GENHD_FL_CD 0x0008
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#define GENHD_FL_UP 0x0010
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#define GENHD_FL_SUPPRESS_PARTITION_INFO 0x0020
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#define GENHD_FL_EXT_DEVT 0x0040
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#define GENHD_FL_NATIVE_CAPACITY 0x0080
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#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 0x0100
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#define GENHD_FL_NO_PART_SCAN 0x0200
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#define GENHD_FL_HIDDEN 0x0400
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enum {
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DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
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DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
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};
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enum {
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/* Poll even if events_poll_msecs is unset */
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DISK_EVENT_FLAG_POLL = 1 << 0,
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/* Forward events to udev */
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DISK_EVENT_FLAG_UEVENT = 1 << 1,
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};
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struct disk_part_tbl {
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struct rcu_head rcu_head;
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int len;
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struct hd_struct __rcu *last_lookup;
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struct hd_struct __rcu *part[];
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};
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struct disk_events;
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struct badblocks;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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struct blk_integrity {
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const struct blk_integrity_profile *profile;
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unsigned char flags;
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unsigned char tuple_size;
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unsigned char interval_exp;
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unsigned char tag_size;
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};
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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struct gendisk {
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/* major, first_minor and minors are input parameters only,
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* don't use directly. Use disk_devt() and disk_max_parts().
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*/
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int major; /* major number of driver */
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int first_minor;
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int minors; /* maximum number of minors, =1 for
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* disks that can't be partitioned. */
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char disk_name[DISK_NAME_LEN]; /* name of major driver */
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unsigned short events; /* supported events */
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unsigned short event_flags; /* flags related to event processing */
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/* Array of pointers to partitions indexed by partno.
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* Protected with matching bdev lock but stat and other
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* non-critical accesses use RCU. Always access through
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* helpers.
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*/
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struct disk_part_tbl __rcu *part_tbl;
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struct hd_struct part0;
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const struct block_device_operations *fops;
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struct request_queue *queue;
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void *private_data;
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int flags;
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struct rw_semaphore lookup_sem;
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struct kobject *slave_dir;
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struct timer_rand_state *random;
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atomic_t sync_io; /* RAID */
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struct disk_events *ev;
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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struct kobject integrity_kobj;
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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int node_id;
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struct badblocks *bb;
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struct lockdep_map lockdep_map;
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};
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static inline struct gendisk *part_to_disk(struct hd_struct *part)
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{
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if (likely(part)) {
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if (part->partno)
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return dev_to_disk(part_to_dev(part)->parent);
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else
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return dev_to_disk(part_to_dev(part));
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}
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return NULL;
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}
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static inline int disk_max_parts(struct gendisk *disk)
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{
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if (disk->flags & GENHD_FL_EXT_DEVT)
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return DISK_MAX_PARTS;
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return disk->minors;
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}
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static inline bool disk_part_scan_enabled(struct gendisk *disk)
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{
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return disk_max_parts(disk) > 1 &&
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!(disk->flags & GENHD_FL_NO_PART_SCAN);
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}
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static inline dev_t disk_devt(struct gendisk *disk)
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{
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return MKDEV(disk->major, disk->first_minor);
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}
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static inline dev_t part_devt(struct hd_struct *part)
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{
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return part_to_dev(part)->devt;
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}
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extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
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extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
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static inline void disk_put_part(struct hd_struct *part)
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{
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if (likely(part))
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put_device(part_to_dev(part));
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}
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/*
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* Smarter partition iterator without context limits.
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*/
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#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
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#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
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#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
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#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
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struct disk_part_iter {
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struct gendisk *disk;
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struct hd_struct *part;
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int idx;
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unsigned int flags;
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};
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extern void disk_part_iter_init(struct disk_part_iter *piter,
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struct gendisk *disk, unsigned int flags);
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extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
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extern void disk_part_iter_exit(struct disk_part_iter *piter);
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extern bool disk_has_partitions(struct gendisk *disk);
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/* block/genhd.c */
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extern void device_add_disk(struct device *parent, struct gendisk *disk,
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const struct attribute_group **groups);
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static inline void add_disk(struct gendisk *disk)
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{
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device_add_disk(NULL, disk, NULL);
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}
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extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
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static inline void add_disk_no_queue_reg(struct gendisk *disk)
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{
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device_add_disk_no_queue_reg(NULL, disk);
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}
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extern void del_gendisk(struct gendisk *gp);
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extern struct gendisk *get_gendisk(dev_t dev, int *partno);
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extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
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extern void set_device_ro(struct block_device *bdev, int flag);
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extern void set_disk_ro(struct gendisk *disk, int flag);
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static inline int get_disk_ro(struct gendisk *disk)
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{
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return disk->part0.policy;
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}
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extern void disk_block_events(struct gendisk *disk);
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extern void disk_unblock_events(struct gendisk *disk);
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extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
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extern void set_capacity_revalidate_and_notify(struct gendisk *disk,
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sector_t size, bool revalidate);
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extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
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/* drivers/char/random.c */
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extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
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extern void rand_initialize_disk(struct gendisk *disk);
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static inline sector_t get_start_sect(struct block_device *bdev)
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{
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return bdev->bd_part->start_sect;
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}
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static inline sector_t get_capacity(struct gendisk *disk)
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{
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return disk->part0.nr_sects;
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}
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static inline void set_capacity(struct gendisk *disk, sector_t size)
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{
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disk->part0.nr_sects = size;
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}
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extern dev_t blk_lookup_devt(const char *name, int partno);
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int bdev_disk_changed(struct block_device *bdev, bool invalidate);
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int blk_add_partitions(struct gendisk *disk, struct block_device *bdev);
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int blk_drop_partitions(struct gendisk *disk, struct block_device *bdev);
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extern void printk_all_partitions(void);
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extern struct gendisk *__alloc_disk_node(int minors, int node_id);
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extern struct kobject *get_disk_and_module(struct gendisk *disk);
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extern void put_disk(struct gendisk *disk);
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extern void put_disk_and_module(struct gendisk *disk);
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extern void blk_register_region(dev_t devt, unsigned long range,
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struct module *module,
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struct kobject *(*probe)(dev_t, int *, void *),
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int (*lock)(dev_t, void *),
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void *data);
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extern void blk_unregister_region(dev_t devt, unsigned long range);
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#define alloc_disk_node(minors, node_id) \
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({ \
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static struct lock_class_key __key; \
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const char *__name; \
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struct gendisk *__disk; \
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\
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__name = "(gendisk_completion)"#minors"("#node_id")"; \
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\
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__disk = __alloc_disk_node(minors, node_id); \
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\
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if (__disk) \
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lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
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\
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__disk; \
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})
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#define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
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#else /* CONFIG_BLOCK */
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static inline void printk_all_partitions(void) { }
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static inline dev_t blk_lookup_devt(const char *name, int partno)
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{
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dev_t devt = MKDEV(0, 0);
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return devt;
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}
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#endif /* CONFIG_BLOCK */
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#endif /* _LINUX_GENHD_H */
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