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340 lines
9.9 KiB
340 lines
9.9 KiB
/* 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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* <[email protected]> |
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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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extern const struct device_type disk_type; |
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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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#include <linux/xarray.h> |
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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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/** |
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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_events; |
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struct badblocks; |
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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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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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struct xarray part_tbl; |
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struct block_device *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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unsigned long state; |
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#define GD_NEED_PART_SCAN 0 |
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#define GD_READ_ONLY 1 |
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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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#if IS_ENABLED(CONFIG_CDROM) |
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struct cdrom_device_info *cdi; |
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#endif |
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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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/* |
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* The gendisk is refcounted by the part0 block_device, and the bd_device |
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* therein is also used for device model presentation in sysfs. |
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*/ |
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#define dev_to_disk(device) \ |
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(dev_to_bdev(device)->bd_disk) |
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#define disk_to_dev(disk) \ |
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(&((disk)->part0->bd_device)) |
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#if IS_REACHABLE(CONFIG_CDROM) |
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#define disk_to_cdi(disk) ((disk)->cdi) |
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#else |
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#define disk_to_cdi(disk) NULL |
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#endif |
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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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void disk_uevent(struct gendisk *disk, enum kobject_action action); |
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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_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 block_device *part; |
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unsigned long 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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struct block_device *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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/* 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 block_device *bdget_disk(struct gendisk *disk, int partno); |
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void set_disk_ro(struct gendisk *disk, bool read_only); |
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static inline int get_disk_ro(struct gendisk *disk) |
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{ |
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return disk->part0->bd_read_only || |
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test_bit(GD_READ_ONLY, &disk->state); |
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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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bool set_capacity_and_notify(struct gendisk *disk, sector_t size); |
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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_start_sect; |
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} |
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static inline sector_t bdev_nr_sectors(struct block_device *bdev) |
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{ |
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return i_size_read(bdev->bd_inode) >> 9; |
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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 bdev_nr_sectors(disk->part0); |
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} |
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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 block_device *bdev); |
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extern struct gendisk *__alloc_disk_node(int minors, int node_id); |
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extern void put_disk(struct gendisk *disk); |
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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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int __register_blkdev(unsigned int major, const char *name, |
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void (*probe)(dev_t devt)); |
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#define register_blkdev(major, name) \ |
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__register_blkdev(major, name, NULL) |
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void unregister_blkdev(unsigned int major, const char *name); |
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bool bdev_check_media_change(struct block_device *bdev); |
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int __invalidate_device(struct block_device *bdev, bool kill_dirty); |
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void set_capacity(struct gendisk *disk, sector_t size); |
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/* for drivers/char/raw.c: */ |
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int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); |
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long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); |
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#ifdef CONFIG_SYSFS |
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int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); |
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void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); |
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#else |
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static inline int bd_link_disk_holder(struct block_device *bdev, |
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struct gendisk *disk) |
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{ |
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return 0; |
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} |
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static inline void bd_unlink_disk_holder(struct block_device *bdev, |
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struct gendisk *disk) |
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{ |
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} |
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#endif /* CONFIG_SYSFS */ |
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extern struct rw_semaphore bdev_lookup_sem; |
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dev_t blk_lookup_devt(const char *name, int partno); |
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void blk_request_module(dev_t devt); |
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#ifdef CONFIG_BLOCK |
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void printk_all_partitions(void); |
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#else /* CONFIG_BLOCK */ |
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static inline void printk_all_partitions(void) |
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{ |
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} |
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#endif /* CONFIG_BLOCK */ |
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#endif /* _LINUX_GENHD_H */
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