include/uapi/linux/btrfs.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/btrfs.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/btrfs.h
Extension
.h
Size
39971 bytes
Lines
1272
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct btrfs_ioctl_vol_args {
	__s64 fd;
	char name[BTRFS_PATH_NAME_MAX + 1];
};

#define BTRFS_DEVICE_PATH_NAME_MAX	1024
#define BTRFS_SUBVOL_NAME_MAX 		4039

#ifndef __KERNEL__
/* Deprecated since 5.7 */
# define BTRFS_SUBVOL_CREATE_ASYNC	(1ULL << 0)
#endif
#define BTRFS_SUBVOL_RDONLY		(1ULL << 1)
#define BTRFS_SUBVOL_QGROUP_INHERIT	(1ULL << 2)

#define BTRFS_DEVICE_SPEC_BY_ID		(1ULL << 3)

#define BTRFS_SUBVOL_SPEC_BY_ID	(1ULL << 4)

#define BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED		\
			(BTRFS_SUBVOL_RDONLY |		\
			BTRFS_SUBVOL_QGROUP_INHERIT |	\
			BTRFS_DEVICE_SPEC_BY_ID |	\
			BTRFS_SUBVOL_SPEC_BY_ID)

#define BTRFS_FSID_SIZE 16
#define BTRFS_UUID_SIZE 16
#define BTRFS_UUID_UNPARSED_SIZE	37

/*
 * flags definition for qgroup limits
 *
 * Used by:
 * struct btrfs_qgroup_limit.flags
 * struct btrfs_qgroup_limit_item.flags
 */
#define BTRFS_QGROUP_LIMIT_MAX_RFER	(1ULL << 0)
#define BTRFS_QGROUP_LIMIT_MAX_EXCL	(1ULL << 1)
#define BTRFS_QGROUP_LIMIT_RSV_RFER	(1ULL << 2)
#define BTRFS_QGROUP_LIMIT_RSV_EXCL	(1ULL << 3)
#define BTRFS_QGROUP_LIMIT_RFER_CMPR	(1ULL << 4)
#define BTRFS_QGROUP_LIMIT_EXCL_CMPR	(1ULL << 5)

struct btrfs_qgroup_limit {
	__u64	flags;
	__u64	max_rfer;
	__u64	max_excl;
	__u64	rsv_rfer;
	__u64	rsv_excl;
};

/*
 * flags definition for qgroup inheritance
 *
 * Used by:
 * struct btrfs_qgroup_inherit.flags
 */
#define BTRFS_QGROUP_INHERIT_SET_LIMITS	(1ULL << 0)
#define BTRFS_QGROUP_INHERIT_FLAGS_SUPP (BTRFS_QGROUP_INHERIT_SET_LIMITS)

struct btrfs_qgroup_inherit {
	__u64	flags;
	__u64	num_qgroups;
	__u64	num_ref_copies;
	__u64	num_excl_copies;
	struct btrfs_qgroup_limit lim;
	__u64	qgroups[];
};

struct btrfs_ioctl_qgroup_limit_args {
	__u64	qgroupid;
	struct btrfs_qgroup_limit lim;
};

/*
 * Arguments for specification of subvolumes or devices, supporting by-name or
 * by-id and flags
 *
 * The set of supported flags depends on the ioctl
 *
 * BTRFS_SUBVOL_RDONLY is also provided/consumed by the following ioctls:
 * - BTRFS_IOC_SUBVOL_GETFLAGS
 * - BTRFS_IOC_SUBVOL_SETFLAGS
 */

/* Supported flags for BTRFS_IOC_RM_DEV_V2 */
#define BTRFS_DEVICE_REMOVE_ARGS_MASK					\
	(BTRFS_DEVICE_SPEC_BY_ID)

/* Supported flags for BTRFS_IOC_SNAP_CREATE_V2 and BTRFS_IOC_SUBVOL_CREATE_V2 */

Annotation

Implementation Notes