fs/bcachefs/bcachefs_ioctl.h - linux/torvalds/linux - Git at Google

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

 #include <linux/uuid.h>
 #include <asm/ioctl.h>
 #include "bcachefs_format.h"

 /*
  * Flags common to multiple ioctls:
  */
 #define BCH_FORCE_IF_DATA_LOST		(1 << 0)
 #define BCH_FORCE_IF_METADATA_LOST	(1 << 1)
 #define BCH_FORCE_IF_DATA_DEGRADED	(1 << 2)
 #define BCH_FORCE_IF_METADATA_DEGRADED	(1 << 3)

 #define BCH_FORCE_IF_LOST			\
 	(BCH_FORCE_IF_DATA_LOST|		\
 	 BCH_FORCE_IF_METADATA_LOST)
 #define BCH_FORCE_IF_DEGRADED			\
 	(BCH_FORCE_IF_DATA_DEGRADED|		\
 	 BCH_FORCE_IF_METADATA_DEGRADED)

 /*
  * If cleared, ioctl that refer to a device pass it as a pointer to a pathname
  * (e.g. /dev/sda1); if set, the dev field is the device's index within the
  * filesystem:
  */
 #define BCH_BY_INDEX			(1 << 4)

 /*
  * For BCH_IOCTL_READ_SUPER: get superblock of a specific device, not filesystem
  * wide superblock:
  */
 #define BCH_READ_DEV			(1 << 5)

 /* global control dev: */

 /* These are currently broken, and probably unnecessary: */
 #if 0
 #define BCH_IOCTL_ASSEMBLE	_IOW(0xbc, 1, struct bch_ioctl_assemble)
 #define BCH_IOCTL_INCREMENTAL	_IOW(0xbc, 2, struct bch_ioctl_incremental)

 struct bch_ioctl_assemble {
 	__u32			flags;
 	__u32			nr_devs;
 	__u64			pad;
 	__u64			devs[];
 };

 struct bch_ioctl_incremental {
 	__u32			flags;
 	__u64			pad;
 	__u64			dev;
 };
 #endif

 /* filesystem ioctls: */

 #define BCH_IOCTL_QUERY_UUID	_IOR(0xbc,	1,  struct bch_ioctl_query_uuid)

 /* These only make sense when we also have incremental assembly */
 #if 0
 #define BCH_IOCTL_START		_IOW(0xbc,	2,  struct bch_ioctl_start)
 #define BCH_IOCTL_STOP		_IO(0xbc,	3)
 #endif

 #define BCH_IOCTL_DISK_ADD	_IOW(0xbc,	4,  struct bch_ioctl_disk)
 #define BCH_IOCTL_DISK_REMOVE	_IOW(0xbc,	5,  struct bch_ioctl_disk)
 #define BCH_IOCTL_DISK_ONLINE	_IOW(0xbc,	6,  struct bch_ioctl_disk)
 #define BCH_IOCTL_DISK_OFFLINE	_IOW(0xbc,	7,  struct bch_ioctl_disk)
 #define BCH_IOCTL_DISK_SET_STATE _IOW(0xbc,	8,  struct bch_ioctl_disk_set_state)
 #define BCH_IOCTL_DATA		_IOW(0xbc,	10, struct bch_ioctl_data)
 #define BCH_IOCTL_FS_USAGE	_IOWR(0xbc,	11, struct bch_ioctl_fs_usage)
 #define BCH_IOCTL_DEV_USAGE	_IOWR(0xbc,	11, struct bch_ioctl_dev_usage)
 #define BCH_IOCTL_READ_SUPER	_IOW(0xbc,	12, struct bch_ioctl_read_super)
 #define BCH_IOCTL_DISK_GET_IDX	_IOW(0xbc,	13,  struct bch_ioctl_disk_get_idx)
 #define BCH_IOCTL_DISK_RESIZE	_IOW(0xbc,	14,  struct bch_ioctl_disk_resize)
 #define BCH_IOCTL_DISK_RESIZE_JOURNAL _IOW(0xbc,15,  struct bch_ioctl_disk_resize_journal)

 #define BCH_IOCTL_SUBVOLUME_CREATE _IOW(0xbc,	16,  struct bch_ioctl_subvolume)
 #define BCH_IOCTL_SUBVOLUME_DESTROY _IOW(0xbc,	17,  struct bch_ioctl_subvolume)

 #define BCH_IOCTL_DEV_USAGE_V2	_IOWR(0xbc,	18, struct bch_ioctl_dev_usage_v2)

 #define BCH_IOCTL_FSCK_OFFLINE	_IOW(0xbc,	19,  struct bch_ioctl_fsck_offline)
 #define BCH_IOCTL_FSCK_ONLINE	_IOW(0xbc,	20,  struct bch_ioctl_fsck_online)

 /* ioctl below act on a particular file, not the filesystem as a whole: */

 #define BCHFS_IOC_REINHERIT_ATTRS	_IOR(0xbc, 64, const char __user *)

 /*
  * BCH_IOCTL_QUERY_UUID: get filesystem UUID
  *
  * Returns user visible UUID, not internal UUID (which may not ever be changed);
  * the filesystem's sysfs directory may be found under /sys/fs/bcachefs with
  * this UUID.
  */
 struct bch_ioctl_query_uuid {
 	__uuid_t		uuid;
 };

 #if 0
 struct bch_ioctl_start {
 	__u32			flags;
 	__u32			pad;
 };
 #endif

 /*
  * BCH_IOCTL_DISK_ADD: add a new device to an existing filesystem
  *
  * The specified device must not be open or in use. On success, the new device
  * will be an online member of the filesystem just like any other member.
  *
  * The device must first be prepared by userspace by formatting with a bcachefs
  * superblock, which is only used for passing in superblock options/parameters
  * for that device (in struct bch_member). The new device's superblock should
  * not claim to be a member of any existing filesystem - UUIDs on it will be
  * ignored.
  */

 /*
  * BCH_IOCTL_DISK_REMOVE: permanently remove a member device from a filesystem
  *
  * Any data present on @dev will be permanently deleted, and @dev will be
  * removed from its slot in the filesystem's list of member devices. The device
  * may be either offline or offline.
  *
  * Will fail removing @dev would leave us with insufficient read write devices
  * or degraded/unavailable data, unless the approprate BCH_FORCE_IF_* flags are
  * set.
  */

 /*
  * BCH_IOCTL_DISK_ONLINE: given a disk that is already a member of a filesystem
  * but is not open (e.g. because we started in degraded mode), bring it online
  *
  * all existing data on @dev will be available once the device is online,
  * exactly as if @dev was present when the filesystem was first mounted
  */

 /*
  * BCH_IOCTL_DISK_OFFLINE: offline a disk, causing the kernel to close that
  * block device, without removing it from the filesystem (so it can be brought
  * back online later)
  *
  * Data present on @dev will be unavailable while @dev is offline (unless
  * replicated), but will still be intact and untouched if @dev is brought back
  * online
  *
  * Will fail (similarly to BCH_IOCTL_DISK_SET_STATE) if offlining @dev would
  * leave us with insufficient read write devices or degraded/unavailable data,
  * unless the approprate BCH_FORCE_IF_* flags are set.
  */

 struct bch_ioctl_disk {
 	__u32			flags;
 	__u32			pad;
 	__u64			dev;
 };

 /*
  * BCH_IOCTL_DISK_SET_STATE: modify state of a member device of a filesystem
  *
  * @new_state		- one of the bch_member_state states (rw, ro, failed,
  *			  spare)
  *
  * Will refuse to change member state if we would then have insufficient devices
  * to write to, or if it would result in degraded data (when @new_state is
  * failed or spare) unless the appropriate BCH_FORCE_IF_* flags are set.
  */
 struct bch_ioctl_disk_set_state {
 	__u32			flags;
 	__u8			new_state;
 	__u8			pad[3];
 	__u64			dev;
 };

 #define BCH_DATA_OPS()			\
 	x(scrub,		0)	\
 	x(rereplicate,		1)	\
 	x(migrate,		2)	\
 	x(rewrite_old_nodes,	3)	\
 	x(drop_extra_replicas,	4)

 enum bch_data_ops {
 #define x(t, n) BCH_DATA_OP_##t = n,
 	BCH_DATA_OPS()
 #undef x
 	BCH_DATA_OP_NR
 };

 /*
  * BCH_IOCTL_DATA: operations that walk and manipulate filesystem data (e.g.
  * scrub, rereplicate, migrate).
  *
  * This ioctl kicks off a job in the background, and returns a file descriptor.
  * Reading from the file descriptor returns a struct bch_ioctl_data_event,
  * indicating current progress, and closing the file descriptor will stop the
  * job. The file descriptor is O_CLOEXEC.
  */
 struct bch_ioctl_data {
 	__u16			op;
 	__u8			start_btree;
 	__u8			end_btree;
 	__u32			flags;

 	struct bpos		start_pos;
 	struct bpos		end_pos;

 	union {
 	struct {
 		__u32		dev;
 		__u32		pad;
 	}			migrate;
 	struct {
 		__u64		pad[8];
 	};
 	};
 } __packed __aligned(8);

 enum bch_data_event {
 	BCH_DATA_EVENT_PROGRESS	= 0,
 	/* XXX: add an event for reporting errors */
 	BCH_DATA_EVENT_NR	= 1,
 };

 struct bch_ioctl_data_progress {
 	__u8			data_type;
 	__u8			btree_id;
 	__u8			pad[2];
 	struct bpos		pos;

 	__u64			sectors_done;
 	__u64			sectors_total;
 } __packed __aligned(8);

 struct bch_ioctl_data_event {
 	__u8			type;
 	__u8			pad[7];
 	union {
 	struct bch_ioctl_data_progress p;
 	__u64			pad2[15];
 	};
 } __packed __aligned(8);

 struct bch_replicas_usage {
 	__u64			sectors;
 	struct bch_replicas_entry_v1 r;
 } __packed;

 static inline struct bch_replicas_usage *
 replicas_usage_next(struct bch_replicas_usage *u)
 {
 	return (void *) u + replicas_entry_bytes(&u->r) + 8;
 }

 /*
  * BCH_IOCTL_FS_USAGE: query filesystem disk space usage
  *
  * Returns disk space usage broken out by data type, number of replicas, and
  * by component device
  *
  * @replica_entries_bytes - size, in bytes, allocated for replica usage entries
  *
  * On success, @replica_entries_bytes will be changed to indicate the number of
  * bytes actually used.
  *
  * Returns -ERANGE if @replica_entries_bytes was too small
  */
 struct bch_ioctl_fs_usage {
 	__u64			capacity;
 	__u64			used;
 	__u64			online_reserved;
 	__u64			persistent_reserved[BCH_REPLICAS_MAX];

 	__u32			replica_entries_bytes;
 	__u32			pad;

 	struct bch_replicas_usage replicas[];
 };

 /*
  * BCH_IOCTL_DEV_USAGE: query device disk space usage
  *
  * Returns disk space usage broken out by data type - both by buckets and
  * sectors.
  */
 struct bch_ioctl_dev_usage {
 	__u64			dev;
 	__u32			flags;
 	__u8			state;
 	__u8			pad[7];

 	__u32			bucket_size;
 	__u64			nr_buckets;

 	__u64			buckets_ec;

 	struct bch_ioctl_dev_usage_type {
 		__u64		buckets;
 		__u64		sectors;
 		__u64		fragmented;
 	}			d[10];
 };

 struct bch_ioctl_dev_usage_v2 {
 	__u64			dev;
 	__u32			flags;
 	__u8			state;
 	__u8			nr_data_types;
 	__u8			pad[6];

 	__u32			bucket_size;
 	__u64			nr_buckets;

 	struct bch_ioctl_dev_usage_type d[];
 };

 /*
  * BCH_IOCTL_READ_SUPER: read filesystem superblock
  *
  * Equivalent to reading the superblock directly from the block device, except
  * avoids racing with the kernel writing the superblock or having to figure out
  * which block device to read
  *
  * @sb		- buffer to read into
  * @size	- size of userspace allocated buffer
  * @dev		- device to read superblock for, if BCH_READ_DEV flag is
  *		  specified
  *
  * Returns -ERANGE if buffer provided is too small
  */
 struct bch_ioctl_read_super {
 	__u32			flags;
 	__u32			pad;
 	__u64			dev;
 	__u64			size;
 	__u64			sb;
 };

 /*
  * BCH_IOCTL_DISK_GET_IDX: give a path to a block device, query filesystem to
  * determine if disk is a (online) member - if so, returns device's index
  *
  * Returns -ENOENT if not found
  */
 struct bch_ioctl_disk_get_idx {
 	__u64			dev;
 };

 /*
  * BCH_IOCTL_DISK_RESIZE: resize filesystem on a device
  *
  * @dev		- member to resize
  * @nbuckets	- new number of buckets
  */
 struct bch_ioctl_disk_resize {
 	__u32			flags;
 	__u32			pad;
 	__u64			dev;
 	__u64			nbuckets;
 };

 /*
  * BCH_IOCTL_DISK_RESIZE_JOURNAL: resize journal on a device
  *
  * @dev		- member to resize
  * @nbuckets	- new number of buckets
  */
 struct bch_ioctl_disk_resize_journal {
 	__u32			flags;
 	__u32			pad;
 	__u64			dev;
 	__u64			nbuckets;
 };

 struct bch_ioctl_subvolume {
 	__u32			flags;
 	__u32			dirfd;
 	__u16			mode;
 	__u16			pad[3];
 	__u64			dst_ptr;
 	__u64			src_ptr;
 };

 #define BCH_SUBVOL_SNAPSHOT_CREATE	(1U << 0)
 #define BCH_SUBVOL_SNAPSHOT_RO		(1U << 1)

 /*
  * BCH_IOCTL_FSCK_OFFLINE: run fsck from the 'bcachefs fsck' userspace command,
  * but with the kernel's implementation of fsck:
  */
 struct bch_ioctl_fsck_offline {
 	__u64			flags;
 	__u64			opts;		/* string */
 	__u64			nr_devs;
 	__u64			devs[] __counted_by(nr_devs);
 };

 /*
  * BCH_IOCTL_FSCK_ONLINE: run fsck from the 'bcachefs fsck' userspace command,
  * but with the kernel's implementation of fsck:
  */
 struct bch_ioctl_fsck_online {
 	__u64			flags;
 	__u64			opts;		/* string */
 };

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

	#include <linux/uuid.h>
	#include <asm/ioctl.h>
	#include "bcachefs_format.h"

	/*
	* Flags common to multiple ioctls:
	*/
	#define BCH_FORCE_IF_DATA_LOST (1 << 0)
	#define BCH_FORCE_IF_METADATA_LOST (1 << 1)
	#define BCH_FORCE_IF_DATA_DEGRADED (1 << 2)
	#define BCH_FORCE_IF_METADATA_DEGRADED (1 << 3)

	#define BCH_FORCE_IF_LOST \
	(BCH_FORCE_IF_DATA_LOST\| \
	BCH_FORCE_IF_METADATA_LOST)
	#define BCH_FORCE_IF_DEGRADED \
	(BCH_FORCE_IF_DATA_DEGRADED\| \
	BCH_FORCE_IF_METADATA_DEGRADED)

	/*
	* If cleared, ioctl that refer to a device pass it as a pointer to a pathname
	* (e.g. /dev/sda1); if set, the dev field is the device's index within the
	* filesystem:
	*/
	#define BCH_BY_INDEX (1 << 4)

	/*
	* For BCH_IOCTL_READ_SUPER: get superblock of a specific device, not filesystem
	* wide superblock:
	*/
	#define BCH_READ_DEV (1 << 5)

	/* global control dev: */

	/* These are currently broken, and probably unnecessary: */
	#if 0
	#define BCH_IOCTL_ASSEMBLE _IOW(0xbc, 1, struct bch_ioctl_assemble)
	#define BCH_IOCTL_INCREMENTAL _IOW(0xbc, 2, struct bch_ioctl_incremental)

	struct bch_ioctl_assemble {
	__u32 flags;
	__u32 nr_devs;
	__u64 pad;
	__u64 devs[];
	};

	struct bch_ioctl_incremental {
	__u32 flags;
	__u64 pad;
	__u64 dev;
	};
	#endif

	/* filesystem ioctls: */

	#define BCH_IOCTL_QUERY_UUID _IOR(0xbc, 1, struct bch_ioctl_query_uuid)

	/* These only make sense when we also have incremental assembly */
	#if 0
	#define BCH_IOCTL_START _IOW(0xbc, 2, struct bch_ioctl_start)
	#define BCH_IOCTL_STOP _IO(0xbc, 3)
	#endif

	#define BCH_IOCTL_DISK_ADD _IOW(0xbc, 4, struct bch_ioctl_disk)
	#define BCH_IOCTL_DISK_REMOVE _IOW(0xbc, 5, struct bch_ioctl_disk)
	#define BCH_IOCTL_DISK_ONLINE _IOW(0xbc, 6, struct bch_ioctl_disk)
	#define BCH_IOCTL_DISK_OFFLINE _IOW(0xbc, 7, struct bch_ioctl_disk)
	#define BCH_IOCTL_DISK_SET_STATE _IOW(0xbc, 8, struct bch_ioctl_disk_set_state)
	#define BCH_IOCTL_DATA _IOW(0xbc, 10, struct bch_ioctl_data)
	#define BCH_IOCTL_FS_USAGE _IOWR(0xbc, 11, struct bch_ioctl_fs_usage)
	#define BCH_IOCTL_DEV_USAGE _IOWR(0xbc, 11, struct bch_ioctl_dev_usage)
	#define BCH_IOCTL_READ_SUPER _IOW(0xbc, 12, struct bch_ioctl_read_super)
	#define BCH_IOCTL_DISK_GET_IDX _IOW(0xbc, 13, struct bch_ioctl_disk_get_idx)
	#define BCH_IOCTL_DISK_RESIZE _IOW(0xbc, 14, struct bch_ioctl_disk_resize)
	#define BCH_IOCTL_DISK_RESIZE_JOURNAL _IOW(0xbc,15, struct bch_ioctl_disk_resize_journal)

	#define BCH_IOCTL_SUBVOLUME_CREATE _IOW(0xbc, 16, struct bch_ioctl_subvolume)
	#define BCH_IOCTL_SUBVOLUME_DESTROY _IOW(0xbc, 17, struct bch_ioctl_subvolume)

	#define BCH_IOCTL_DEV_USAGE_V2 _IOWR(0xbc, 18, struct bch_ioctl_dev_usage_v2)

	#define BCH_IOCTL_FSCK_OFFLINE _IOW(0xbc, 19, struct bch_ioctl_fsck_offline)
	#define BCH_IOCTL_FSCK_ONLINE _IOW(0xbc, 20, struct bch_ioctl_fsck_online)

	/* ioctl below act on a particular file, not the filesystem as a whole: */

	#define BCHFS_IOC_REINHERIT_ATTRS _IOR(0xbc, 64, const char __user *)

	/*
	* BCH_IOCTL_QUERY_UUID: get filesystem UUID
	*
	* Returns user visible UUID, not internal UUID (which may not ever be changed);
	* the filesystem's sysfs directory may be found under /sys/fs/bcachefs with
	* this UUID.
	*/
	struct bch_ioctl_query_uuid {
	__uuid_t uuid;
	};

	#if 0
	struct bch_ioctl_start {
	__u32 flags;
	__u32 pad;
	};
	#endif

	/*
	* BCH_IOCTL_DISK_ADD: add a new device to an existing filesystem
	*
	* The specified device must not be open or in use. On success, the new device
	* will be an online member of the filesystem just like any other member.
	*
	* The device must first be prepared by userspace by formatting with a bcachefs
	* superblock, which is only used for passing in superblock options/parameters
	* for that device (in struct bch_member). The new device's superblock should
	* not claim to be a member of any existing filesystem - UUIDs on it will be
	* ignored.
	*/

	/*
	* BCH_IOCTL_DISK_REMOVE: permanently remove a member device from a filesystem
	*
	* Any data present on @dev will be permanently deleted, and @dev will be
	* removed from its slot in the filesystem's list of member devices. The device
	* may be either offline or offline.
	*
	* Will fail removing @dev would leave us with insufficient read write devices
	* or degraded/unavailable data, unless the approprate BCH_FORCE_IF_* flags are
	* set.
	*/

	/*
	* BCH_IOCTL_DISK_ONLINE: given a disk that is already a member of a filesystem
	* but is not open (e.g. because we started in degraded mode), bring it online
	*
	* all existing data on @dev will be available once the device is online,
	* exactly as if @dev was present when the filesystem was first mounted
	*/

	/*
	* BCH_IOCTL_DISK_OFFLINE: offline a disk, causing the kernel to close that
	* block device, without removing it from the filesystem (so it can be brought
	* back online later)
	*
	* Data present on @dev will be unavailable while @dev is offline (unless
	* replicated), but will still be intact and untouched if @dev is brought back
	* online
	*
	* Will fail (similarly to BCH_IOCTL_DISK_SET_STATE) if offlining @dev would
	* leave us with insufficient read write devices or degraded/unavailable data,
	* unless the approprate BCH_FORCE_IF_* flags are set.
	*/

	struct bch_ioctl_disk {
	__u32 flags;
	__u32 pad;
	__u64 dev;
	};

	/*
	* BCH_IOCTL_DISK_SET_STATE: modify state of a member device of a filesystem
	*
	* @new_state - one of the bch_member_state states (rw, ro, failed,
	* spare)
	*
	* Will refuse to change member state if we would then have insufficient devices
	* to write to, or if it would result in degraded data (when @new_state is
	* failed or spare) unless the appropriate BCH_FORCE_IF_* flags are set.
	*/
	struct bch_ioctl_disk_set_state {
	__u32 flags;
	__u8 new_state;
	__u8 pad[3];
	__u64 dev;
	};

	#define BCH_DATA_OPS() \
	x(scrub, 0) \
	x(rereplicate, 1) \
	x(migrate, 2) \
	x(rewrite_old_nodes, 3) \
	x(drop_extra_replicas, 4)

	enum bch_data_ops {
	#define x(t, n) BCH_DATA_OP_##t = n,
	BCH_DATA_OPS()
	#undef x
	BCH_DATA_OP_NR
	};

	/*
	* BCH_IOCTL_DATA: operations that walk and manipulate filesystem data (e.g.
	* scrub, rereplicate, migrate).
	*
	* This ioctl kicks off a job in the background, and returns a file descriptor.
	* Reading from the file descriptor returns a struct bch_ioctl_data_event,
	* indicating current progress, and closing the file descriptor will stop the
	* job. The file descriptor is O_CLOEXEC.
	*/
	struct bch_ioctl_data {
	__u16 op;
	__u8 start_btree;
	__u8 end_btree;
	__u32 flags;

	struct bpos start_pos;
	struct bpos end_pos;

	union {
	struct {
	__u32 dev;
	__u32 pad;
	} migrate;
	struct {
	__u64 pad[8];
	};
	};
	} __packed __aligned(8);

	enum bch_data_event {
	BCH_DATA_EVENT_PROGRESS = 0,
	/* XXX: add an event for reporting errors */
	BCH_DATA_EVENT_NR = 1,
	};

	struct bch_ioctl_data_progress {
	__u8 data_type;
	__u8 btree_id;
	__u8 pad[2];
	struct bpos pos;

	__u64 sectors_done;
	__u64 sectors_total;
	} __packed __aligned(8);

	struct bch_ioctl_data_event {
	__u8 type;
	__u8 pad[7];
	union {
	struct bch_ioctl_data_progress p;
	__u64 pad2[15];
	};
	} __packed __aligned(8);

	struct bch_replicas_usage {
	__u64 sectors;
	struct bch_replicas_entry_v1 r;
	} __packed;

	static inline struct bch_replicas_usage *
	replicas_usage_next(struct bch_replicas_usage *u)
	{
	return (void *) u + replicas_entry_bytes(&u->r) + 8;
	}

	/*
	* BCH_IOCTL_FS_USAGE: query filesystem disk space usage
	*
	* Returns disk space usage broken out by data type, number of replicas, and
	* by component device
	*
	* @replica_entries_bytes - size, in bytes, allocated for replica usage entries
	*
	* On success, @replica_entries_bytes will be changed to indicate the number of
	* bytes actually used.
	*
	* Returns -ERANGE if @replica_entries_bytes was too small
	*/
	struct bch_ioctl_fs_usage {
	__u64 capacity;
	__u64 used;
	__u64 online_reserved;
	__u64 persistent_reserved[BCH_REPLICAS_MAX];

	__u32 replica_entries_bytes;
	__u32 pad;

	struct bch_replicas_usage replicas[];
	};

	/*
	* BCH_IOCTL_DEV_USAGE: query device disk space usage
	*
	* Returns disk space usage broken out by data type - both by buckets and
	* sectors.
	*/
	struct bch_ioctl_dev_usage {
	__u64 dev;
	__u32 flags;
	__u8 state;
	__u8 pad[7];

	__u32 bucket_size;
	__u64 nr_buckets;

	__u64 buckets_ec;

	struct bch_ioctl_dev_usage_type {
	__u64 buckets;
	__u64 sectors;
	__u64 fragmented;
	} d[10];
	};

	struct bch_ioctl_dev_usage_v2 {
	__u64 dev;
	__u32 flags;
	__u8 state;
	__u8 nr_data_types;
	__u8 pad[6];

	__u32 bucket_size;
	__u64 nr_buckets;

	struct bch_ioctl_dev_usage_type d[];
	};

	/*
	* BCH_IOCTL_READ_SUPER: read filesystem superblock
	*
	* Equivalent to reading the superblock directly from the block device, except
	* avoids racing with the kernel writing the superblock or having to figure out
	* which block device to read
	*
	* @sb - buffer to read into
	* @size - size of userspace allocated buffer
	* @dev - device to read superblock for, if BCH_READ_DEV flag is
	* specified
	*
	* Returns -ERANGE if buffer provided is too small
	*/
	struct bch_ioctl_read_super {
	__u32 flags;
	__u32 pad;
	__u64 dev;
	__u64 size;
	__u64 sb;
	};

	/*
	* BCH_IOCTL_DISK_GET_IDX: give a path to a block device, query filesystem to
	* determine if disk is a (online) member - if so, returns device's index
	*
	* Returns -ENOENT if not found
	*/
	struct bch_ioctl_disk_get_idx {
	__u64 dev;
	};

	/*
	* BCH_IOCTL_DISK_RESIZE: resize filesystem on a device
	*
	* @dev - member to resize
	* @nbuckets - new number of buckets
	*/
	struct bch_ioctl_disk_resize {
	__u32 flags;
	__u32 pad;
	__u64 dev;
	__u64 nbuckets;
	};

	/*
	* BCH_IOCTL_DISK_RESIZE_JOURNAL: resize journal on a device
	*
	* @dev - member to resize
	* @nbuckets - new number of buckets
	*/
	struct bch_ioctl_disk_resize_journal {
	__u32 flags;
	__u32 pad;
	__u64 dev;
	__u64 nbuckets;
	};

	struct bch_ioctl_subvolume {
	__u32 flags;
	__u32 dirfd;
	__u16 mode;
	__u16 pad[3];
	__u64 dst_ptr;
	__u64 src_ptr;
	};

	#define BCH_SUBVOL_SNAPSHOT_CREATE (1U << 0)
	#define BCH_SUBVOL_SNAPSHOT_RO (1U << 1)

	/*
	* BCH_IOCTL_FSCK_OFFLINE: run fsck from the 'bcachefs fsck' userspace command,
	* but with the kernel's implementation of fsck:
	*/
	struct bch_ioctl_fsck_offline {
	__u64 flags;
	__u64 opts; /* string */
	__u64 nr_devs;
	__u64 devs[] __counted_by(nr_devs);
	};

	/*
	* BCH_IOCTL_FSCK_ONLINE: run fsck from the 'bcachefs fsck' userspace command,
	* but with the kernel's implementation of fsck:
	*/
	struct bch_ioctl_fsck_online {
	__u64 flags;
	__u64 opts; /* string */
	};

	#endif /* _BCACHEFS_IOCTL_H */