btrfs

package
v0.0.5 Latest Latest
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 Go to latest Published: Nov 25, 2022 License: LGPL-3.0 Imports: 20 Imported by: 26

Documentation

Overview

Package btrfs contains low-level bindings to the Btrfs filesystem. Most of the types and ioctl constants are generated from the Btrfs kernel headers.

Index

Constants

View Source 
const (
	IOC_NONE  = 0x0
	IOC_WRITE = 0x1
	IOC_READ  = 0x2

	IOC_NRBITS   = 8
	IOC_TYPEBITS = 8

	IOC_SIZEBITS = 14
	IOC_DIRBITS  = 2

	IOC_NRSHIFT   = 0
	IOC_TYPESHIFT = IOC_NRSHIFT + IOC_NRBITS
	IOC_SIZESHIFT = IOC_TYPESHIFT + IOC_TYPEBITS
	IOC_DIRSHIFT  = IOC_SIZESHIFT + IOC_SIZEBITS

	IOC_NRMASK   = ((1 << IOC_NRBITS) - 1)
	IOC_TYPEMASK = ((1 << IOC_TYPEBITS) - 1)
	IOC_SIZEMASK = ((1 << IOC_SIZEBITS) - 1)
	IOC_DIRMASK  = ((1 << IOC_DIRBITS) - 1)
)

Generic ioctl constants

View Source 
const (
	SubvolReadOnly = 0x2

	NoFileData       = 0x1
	OmitStreamHeader = 0x2
	OmitEndCommand   = 0x3
	SendVersion      = 0x8
	SendCompressed   = 0x10

	RootTreeObjectID       ObjectID = 0x1
	ExtentTreeObjectID     ObjectID = 0x2
	ChunkTreeObjectID      ObjectID = 0x3
	DevTreeObjectID        ObjectID = 0x4
	FSTreeObjectID         ObjectID = 0x5
	RootTreeDirObjectID    ObjectID = 0x6
	CSumTreeObjectID       ObjectID = 0x7
	QuotaTreeObjectID      ObjectID = 0x8
	UUIDTreeObjectID       ObjectID = 0x9
	FreeSpaceTreeObjectID  ObjectID = 0xa
	BlockGroupTreeObjectID ObjectID = 0xb
	DevStatsObjectID       ObjectID = 0x0
	BalanceObjectID        ObjectID = 0xfffffffffffffffc
	OrphanObjectID         ObjectID = 0xfffffffffffffffb
	TreeLogObjectID        ObjectID = 0xfffffffffffffffa
	TreeLogFixupObjectID   ObjectID = 0xfffffffffffffff9
	TreeRelocObjectID      ObjectID = 0xfffffffffffffff8
	DataRelocTreeObjectID  ObjectID = 0xfffffffffffffff7
	ExtentCSumObjectID     ObjectID = 0xfffffffffffffff6
	FreeSpaceObjectID      ObjectID = 0xfffffffffffffff5
	FreeInoObjectID        ObjectID = 0xfffffffffffffff4
	MultipleObjectIDs      ObjectID = 0xffffffffffffff01

	FirstFreeObjectID ObjectID = 0x100
	LastFreeObjectID  ObjectID = 0xffffffffffffff00

	DirItemKey     SearchKey = 0x54
	InodeRefKey    SearchKey = 0xc
	InodeItemKey   SearchKey = 0x1
	RootItemKey    SearchKey = 0x84
	RootRefKey     SearchKey = 0x9c
	RootBackrefKey SearchKey = 0x90

	CompressionNone   CompressionType = 0x0
	CompressionZLib   CompressionType = 0x1
	CompressionZSTD   CompressionType = 0x2
	CompressionLZO4k  CompressionType = 0x3
	CompressionLZO8k  CompressionType = 0x4
	CompressionLZO16k CompressionType = 0x5
	CompressionLZO32k CompressionType = 0x6
	CompressionLZO64k CompressionType = 0x7
)
View Source 
const (
	BTRFS_IOCTL_MAGIC uintptr = 0x94
)

BTRFS ioctl constants

View Source 
const BTRFS_SUPER_MAGIC = 0x9123683E

Variables

View Source 
var (
	ErrInvalidUUID = errors.New("invalid UUID")
	ErrNotFound    = errors.New("not found")
)
View Source 
var (
	ErrEncryptionNotSupported = errors.New("encryption not supported")
)
View Source 
var (
	// ErrRootMountNotFound is returned when a root mount cannot be found for a given path.
	ErrRootMountNotFound = fmt.Errorf("could not find root mount for path")
)
View Source 
var ErrStopTreeIteration = fmt.Errorf("stop tree iteration")
View Source 
var ErrStopWalk = fmt.Errorf("stop btrfs walk")

ErrStopWalk is an error that can be returned by the TreeIterFunc to stop the tree walk.

Functions

func Clone 

func Clone(src string, dest string, srcOffset uint64, destOffset uint64, size uint64) error

Clone clones a range of bytes from a source file to a destination file.

func CreateSnapshot 

func CreateSnapshot(source string, opts ...SnapshotOption) error

CreateSnapshot creates a snapshot of the given subvolume with the given options.

func CreateSubvolume 

func CreateSubvolume(path string) error

CreateSubvolume creates a subvolume at the given path.

func DeleteSnapshot 

func DeleteSnapshot(path string) error

DeleteSnapshot deletes the given snapshot.

func DeleteSubvolume 

func DeleteSubvolume(path string) error

DeleteSubvolume deletes the subvolume at the given path. If the subvolume is read-only then it will be made read-write before deletion.

func EnableVerity 

func EnableVerity(path string, algorithm uint32, blockSize uint32, salt []byte, sig []byte) error

EnableVerity enables fs-verity on a path.

func EncodedWrite 

func EncodedWrite(path string, op *EncodedWriteOp) error

EncodedWrite writes encoded data to a file via ioctl.

func FindRootMount 

func FindRootMount(path string) (string, error)

FindRootMount returns the root btrfs mount for the given path.

func IsBtrfs added in v0.0.4 

func IsBtrfs(path string) (bool, error)

IsBtrfs returns true if the given path is a btrfs mount.

func IsSubvolume 

func IsSubvolume(path string) (bool, error)

IsSubvolume returns true if the given path is a subvolume.

func IsSubvolumeReadOnly 

func IsSubvolumeReadOnly(path string) (bool, error)

IsSubvolumeReadOnly returns true if the subvolume at the given path is read-only.

func ListBtrfsMounts added in v0.0.5 

func ListBtrfsMounts() ([]string, error)

ListBtrfsMounts returns a list of all btrfs mounts on the system.

func Send 

func Send(source string, opts ...SendOption) error

Send will send the snapshot at source with the given options. Source must be a path to a read-only snapshot.

func SetReceivedSubvolume 

func SetReceivedSubvolume(path string, uuid uuid.UUID, ctransid uint64) error

SetReceivedSubvolume sets the received UUID and ctransid for a subvolume. This method is intended for use by receive operations.

func SetSubvolumeReadOnly 

func SetSubvolumeReadOnly(path string, readonly bool) error

SetSubvolumeReadOnly sets the read-only status of the subvolume at the given path to readonly.

func SyncFilesystem 

func SyncFilesystem(path string) error

SyncFilesystem runs an I/O sync on the filesystem at the given path. If the path is not a BTRFS filesystem, an error will be returned.

func UUIDTreeLookupID 

func UUIDTreeLookupID(path string, uuid uuid.UUID, typ LookupType) (id uint64, err error)

UUIDTreeLookupID looks up the subvolume ID for the given UUID.

func WalkBtrfsTree 

func WalkBtrfsTree(path string, params SearchParams, fn TreeIterFunc) error

WalkBtrfsTree walks the Btrfs tree at the given path with the given search arguments. The TreeIterFunc is called for each item found in the tree.

Types

type BtrfsDirItem 

type BtrfsDirItem struct {
	Location BtrfsDiskKey
	Type     uint8
}

type BtrfsDiskKey 

type BtrfsDiskKey struct {
	Objectid uint64
	Type     uint8
	Offset   uint64
}

type BtrfsInodeItem 

type BtrfsInodeItem struct {
	Generation uint64
	Transid    uint64
	Size       uint64
	Nbytes     uint64
	Group      uint64
	Nlink      uint32
	Uid        uint32
	Gid        uint32
	Mode       uint32
	Rdev       uint64
	Flags      uint64
	Sequence   uint64
	Reserved   [4]uint64
	Atime      BtrfsTimespec
	Ctime      BtrfsTimespec
	Mtime      BtrfsTimespec
	Otime      BtrfsTimespec
}

type BtrfsInodeRef 

type BtrfsInodeRef struct {
	Index uint64
	Len   uint16
}

type BtrfsRootItem 

type BtrfsRootItem struct {
	Inode          BtrfsInodeItem
	Generation     uint64
	Root_dirid     uint64
	Bytenr         uint64
	Byte_limit     uint64
	Bytes_used     uint64
	Last_snapshot  uint64
	Flags          uint64
	Refs           uint32
	DropProgress   BtrfsDiskKey
	Drop_level     uint8
	Level          uint8
	GenerationV2   uint64
	Uuid           [16]uint8
	Parent_uuid    [16]uint8
	Received_uuid  [16]uint8
	Ctransid       uint64
	Otransid       uint64
	Stransid       uint64
	Rtransid       uint64
	Ctime          BtrfsTimespec
	Otime          BtrfsTimespec
	Stime          BtrfsTimespec
	Rtime          BtrfsTimespec
	Global_tree_id uint64
	Reserved       [7]uint64
}

type BtrfsRootItem_V0 

type BtrfsRootItem_V0 struct {
	Inode        BtrfsInodeItem
	Generation   uint64
	RootDirID    uint64
	ByteNR       uint64
	ByteLimit    uint64
	BytesUsed    uint64
	LastSnapshot uint64
	Flags        uint64
	Refs         uint32
	DropProgress BtrfsDiskKey
	DropLevel    uint8
	Level        uint8
}

type BtrfsRootRef 

type BtrfsRootRef struct {
	Dirid    uint64
	Sequence uint64
	Len      uint16
}

type BtrfsTimespec 

type BtrfsTimespec struct {
	Sec  uint64
	Nsec uint32
}

func (BtrfsTimespec) Time added in v0.0.5 

func (b BtrfsTimespec) Time() time.Time

type CompressionType 

type CompressionType uint32

func (CompressionType) String 

func (i CompressionType) String() string

type DeviceInfo 

type DeviceInfo struct {
	DeviceID   uint64
	UUID       uuid.UUID
	BytesUsed  uint64
	TotalBytes uint64
	Path       string
}

func GetDeviceInfo 

func GetDeviceInfo(path string) (*DeviceInfo, error)

GetDeviceInfo returns information about a device at the given path.

type EncodedWriteOp 

type EncodedWriteOp struct {
	Offset              uint64
	Data                []byte
	UnencodedFileLength uint64
	UnencodedLength     uint64
	UnencodedOffset     uint64
	Compression         CompressionType
	Encryption          uint32 // Not supported yet
}

EncodedWriteOp is an operation to write encoded data to a file.

func (*EncodedWriteOp) Decompress 

func (e *EncodedWriteOp) Decompress() ([]byte, error)

Decompress decompresses the data in the EncodedWriteOp.

type Filesystem 

type Filesystem struct {
	Path         string
	Device       string
	MountOptions []string
}

Filesystem represents a mounted BTRFS filesystem.

func ListFilesystems 

func ListFilesystems() ([]*Filesystem, error)

ListFilesystems returns a list of mounted BTRFS filesystems.

func (*Filesystem) GetDevice 

func (f *Filesystem) GetDevice() (*DeviceInfo, error)

GetDevice returns the device information for the filesystem.

func (*Filesystem) GetInfo 

func (f *Filesystem) GetInfo() (*FilesystemInfo, error)

GetInfo returns metadata about the filesystem.

func (*Filesystem) Snapshot 

func (f *Filesystem) Snapshot(opts ...SnapshotOption) error

Snapshot creates a snapshot of this filesystem at the given path (assumed to be based on the subvolume of this filesystem). If readonly is true, the snapshot will be read-only.

func (*Filesystem) Sync 

func (f *Filesystem) Sync() error

Sync runs an I/O sync on the filesystem.

type FilesystemInfo 

type FilesystemInfo struct {
	MaxID        uint64
	NumDevices   uint64
	FSID         uuid.UUID
	NodeSize     uint32
	SectorSize   uint32
	CloneAlign   uint32
	CsumType     uint16
	CsumSize     uint16
	Flags        uint64
	Generate     uint64
	MetadataUUID uuid.UUID
}

func GetFilesystemInfo 

func GetFilesystemInfo(path string) (*FilesystemInfo, error)

GetFilesystemInfo returns metadata about the filesystem at the given path. If the path is not a BTRFS filesystem, an error will be returned.

type IoctlCmd 

type IoctlCmd uintptr

IoctlCmd is a type cast of uintptr to make it more clear that it is an ioctl. 

const (
	FS_IOC_ENABLE_VERITY        IoctlCmd = 0x40806685
	FS_IOC_MEASURE_VERITY       IoctlCmd = 0xc0046686
	FS_IOC_READ_VERITY_METADATA IoctlCmd = 0xc0286687
)

Fsverity ioctl commands 

const (
	BTRFS_IOC_SNAP_CREATE         IoctlCmd = 0x50009401
	BTRFS_IOC_DEFRAG              IoctlCmd = 0x50009402
	BTRFS_IOC_RESIZE              IoctlCmd = 0x50009403
	BTRFS_IOC_SCAN_DEV            IoctlCmd = 0x50009404
	BTRFS_IOC_FORGET_DEV          IoctlCmd = 0x50009405
	BTRFS_IOC_TRANS_START         IoctlCmd = 0x9406
	BTRFS_IOC_TRANS_END           IoctlCmd = 0x9407
	BTRFS_IOC_SYNC                IoctlCmd = 0x9408
	BTRFS_IOC_CLONE               IoctlCmd = 0x40049409
	BTRFS_IOC_ADD_DEV             IoctlCmd = 0x5000940a
	BTRFS_IOC_RM_DEV              IoctlCmd = 0x5000940b
	BTRFS_IOC_BALANCE             IoctlCmd = 0x5000940c
	BTRFS_IOC_CLONE_RANGE         IoctlCmd = 0x4020940d
	BTRFS_IOC_SUBVOL_CREATE       IoctlCmd = 0x5000940e
	BTRFS_IOC_SNAP_DESTROY        IoctlCmd = 0x5000940f
	BTRFS_IOC_DEFRAG_RANGE        IoctlCmd = 0x40309410
	BTRFS_IOC_TREE_SEARCH         IoctlCmd = 0xd0009411
	BTRFS_IOC_TREE_SEARCH_V2      IoctlCmd = 0xc0709411
	BTRFS_IOC_INO_LOOKUP          IoctlCmd = 0xd0009412
	BTRFS_IOC_DEFAULT_SUBVOL      IoctlCmd = 0x40089413
	BTRFS_IOC_SPACE_INFO          IoctlCmd = 0xc0109414
	BTRFS_IOC_START_SYNC          IoctlCmd = 0x80089418
	BTRFS_IOC_WAIT_SYNC           IoctlCmd = 0x40089416
	BTRFS_IOC_SNAP_CREATE_V2      IoctlCmd = 0x50009417
	BTRFS_IOC_SUBVOL_CREATE_V2    IoctlCmd = 0x50009418
	BTRFS_IOC_SUBVOL_GETFLAGS     IoctlCmd = 0x80089419
	BTRFS_IOC_SUBVOL_SETFLAGS     IoctlCmd = 0x4008941a
	BTRFS_IOC_SCRUB               IoctlCmd = 0xc400941b
	BTRFS_IOC_SCRUB_CANCEL        IoctlCmd = 0x941c
	BTRFS_IOC_SCRUB_PROGRESS      IoctlCmd = 0xc400941d
	BTRFS_IOC_DEV_INFO            IoctlCmd = 0xd000941e
	BTRFS_IOC_FS_INFO             IoctlCmd = 0x8400941f
	BTRFS_IOC_BALANCE_V2          IoctlCmd = 0xc4009420
	BTRFS_IOC_BALANCE_CTL         IoctlCmd = 0x40049421
	BTRFS_IOC_BALANCE_PROGRESS    IoctlCmd = 0x84009422
	BTRFS_IOC_INO_PATHS           IoctlCmd = 0xc0389423
	BTRFS_IOC_LOGICAL_INO         IoctlCmd = 0xc0389424
	BTRFS_IOC_SET_RECEIVED_SUBVOL IoctlCmd = 0xc0c89425
	BTRFS_IOC_SEND                IoctlCmd = 0x40489426
	BTRFS_IOC_DEVICES_READY       IoctlCmd = 0x90009427
	BTRFS_IOC_QUOTA_CTL           IoctlCmd = 0xc0109428
	BTRFS_IOC_QGROUP_ASSIGN       IoctlCmd = 0x40189429
	BTRFS_IOC_QGROUP_CREATE       IoctlCmd = 0x4010942a
	BTRFS_IOC_QGROUP_LIMIT        IoctlCmd = 0x8030942b
	BTRFS_IOC_QUOTA_RESCAN        IoctlCmd = 0x4040942c
	BTRFS_IOC_QUOTA_RESCAN_STATUS IoctlCmd = 0x8040942d
	BTRFS_IOC_QUOTA_RESCAN_WAIT   IoctlCmd = 0x942e
	BTRFS_IOC_GET_DEV_STATS       IoctlCmd = 0xc4089434
	BTRFS_IOC_DEV_REPLACE         IoctlCmd = 0xca289435
	BTRFS_IOC_FILE_EXTENT_SAME    IoctlCmd = 0xc0189436
	BTRFS_IOC_RM_DEV_V2           IoctlCmd = 0x5000943a
	BTRFS_IOC_LOGICAL_INO_V2      IoctlCmd = 0xc038943b
	BTRFS_IOC_GET_SUBVOL_INFO     IoctlCmd = 0x81f8943c
	BTRFS_IOC_GET_SUBVOL_ROOTREF  IoctlCmd = 0xd000943d
	BTRFS_IOC_INO_LOOKUP_USER     IoctlCmd = 0xd000943e
	BTRFS_IOC_SNAP_DESTROY_V2     IoctlCmd = 0x5000943f
	BTRFS_IOC_ENCODED_READ        IoctlCmd = 0x80809440
	BTRFS_IOC_ENCODED_WRITE       IoctlCmd = 0x40809440
)

BTRFS ioctl commands

func (IoctlCmd) Size 

func (c IoctlCmd) Size() uintptr

func (IoctlCmd) String 

func (i IoctlCmd) String() string

type LookupType 

type LookupType uint8
const (
	LookupUUIDKeySubvol         LookupType = 251
	LookupUUIDKeyReceivedSubvol LookupType = 252
)

type ObjectID 

type ObjectID uint64

func (ObjectID) IntString 

func (o ObjectID) IntString() string

func (ObjectID) String 

func (i ObjectID) String() string

type RBNode 

type RBNode struct {
	RBLeft  *RBNode
	RBRight *RBNode
	Info    *RootInfo
}

RBNode represents a node in the Btrfs tree.

type RBRoot 

type RBRoot struct {
	RBNode *RBNode
}

RBRoot represents the root of the Btrfs tree.

func BuildRBTree 

func BuildRBTree(path string) (*RBRoot, error)

BuildRBTree builds a red-black tree from the subvolume root tree. Colors are currently not assigned as they are not needed for the current implementation.

func (*RBRoot) FilterFromRoot added in v0.0.5 

func (r *RBRoot) FilterFromRoot(rootID ObjectID) *RBRoot

func (*RBRoot) InOrderIterate 

func (r *RBRoot) InOrderIterate(f RBTreeIterFunc) error

func (*RBRoot) InsertRoot 

func (r *RBRoot) InsertRoot(info *RootInfo)

func (*RBRoot) LookupRoot 

func (r *RBRoot) LookupRoot(rootID ObjectID) *RootInfo

func (*RBRoot) PostOrderIterate 

func (r *RBRoot) PostOrderIterate(f RBTreeIterFunc) error

func (*RBRoot) PreOrderIterate 

func (r *RBRoot) PreOrderIterate(f RBTreeIterFunc) error

func (*RBRoot) UpdateRoot 

func (r *RBRoot) UpdateRoot(info *RootInfo) bool

type RBTreeIterFunc 

type RBTreeIterFunc func(info *RootInfo, lastErr error) error

RBTreeIterFunc is the function signature for the RBTreeIterFunc. Lasterr is the last error returned by the function. If the function returns an ErrStopTreeIteration error, the iteration will stop and the error will be returned by RBTree.Iterate.

type RootInfo 

type RootInfo struct {
	RBNode *RBNode

	RootID             ObjectID
	RootOffset         uint64
	Flags              uint64
	RefTree            ObjectID
	DirID              uint64
	TopID              uint64
	Generation         uint64
	OriginalGeneration uint64
	CreationTime       time.Time
	SendTime           time.Time
	ReceiveTime        time.Time
	UUID               uuid.UUID
	ParentUUID         uuid.UUID
	ReceivedUUID       uuid.UUID
	Path               string
	Name               string

	// Only populated by resolving the path while building a tree.
	FullPath string
	Deleted  bool

	// Only populated during SubvolumeSearch with SearchWithSnapshots
	Snapshots []*RootInfo

	// The underlying item and reference that built this info
	Item *BtrfsRootItem
	Ref  *BtrfsRootRef
}

RootInfo represents the information about a Btrfs root. RBNode contains a reference to the node in the tree.

func SubvolumeSearch 

func SubvolumeSearch(opts ...SearchOption) (*RootInfo, error)

SubvolumeSearch searches for a subvolume using the given options.

type SearchArgs 

type SearchArgs struct {
	Key SearchParams
	Buf [3992]int8
}

type SearchHeader 

type SearchHeader struct {
	Transid  uint64
	Objectid uint64
	Offset   uint64
	Type     uint32
	Len      uint32
}

func (*SearchHeader) ItemType 

func (s *SearchHeader) ItemType() SearchKey

type SearchKey 

type SearchKey uint32

func (SearchKey) String 

func (i SearchKey) String() string

type SearchOption 

type SearchOption func(*searchContext) error

func SearchWithPath 

func SearchWithPath(path string) SearchOption

SearchWithPath searches for a subvolume starting from the given path. Implies SearchWithRootMount and root detection with FindRootMount.

func SearchWithReceivedUUID 

func SearchWithReceivedUUID(uuid uuid.UUID) SearchOption

SearchWithReceivedUUID searches for a subvolume with the given received UUID.

func SearchWithRootID 

func SearchWithRootID(id uint64) SearchOption

SearchWithRootID searches for a subvolume starting from the given root ID.

func SearchWithRootMount 

func SearchWithRootMount(path string) SearchOption

SearchWithRootMount searches for a subvolume starting from the given root mount point. If not provided, the search will start from the root of the filesystem. You can use the FindRootMount function to find the root mount point of a given path.

func SearchWithSnapshots 

func SearchWithSnapshots() SearchOption

SearchWithSnapshots searches for snapshots of the given subvolume and populates the results with them.

func SearchWithUUID 

func SearchWithUUID(uuid uuid.UUID) SearchOption

SearchWithUUID searches for a subvolume with the given UUID.

type SearchParams 

type SearchParams struct {
	Tree_id      uint64
	Min_objectid uint64
	Max_objectid uint64
	Min_offset   uint64
	Max_offset   uint64
	Min_transid  uint64
	Max_transid  uint64
	Min_type     uint32
	Max_type     uint32
	Nr_items     uint32
	Unused       uint32
	Unused1      uint64
	Unused2      uint64
	Unused3      uint64
	Unused4      uint64
}

type SendOption 

type SendOption func(*sendCtx) error

func SendCompressedData 

func SendCompressedData() SendOption

SendCompressedData

func SendToFile 

func SendToFile(f *os.File) SendOption

SendToFile will send a send stream to the given os.File.

func SendToPath 

func SendToPath(path string) SendOption

SendToPath will send a send stream to the given path as a file.

func SendToPipe added in v0.0.4 

func SendToPipe() (SendOption, *os.File, error)

SendToPipe creates and returns an option and pipe to read the stream from.

func SendWithCloneSources 

func SendWithCloneSources(sources ...string) SendOption

SendWithCloneSources will use the given snapshots as clone sources for an incremental send.

func SendWithLogger 

func SendWithLogger(logger *log.Logger, verbosity int) SendOption

SendWithLogger will log the send operation to the given logger.

func SendWithParentRoot 

func SendWithParentRoot(root string) SendOption

SendWithParentRoot will send an incremental send from the given parent root.

func SendWithoutData 

func SendWithoutData() SendOption

SendWithoutData will send a send stream without any data. This is useful for getting a list of files that have changed.

type SnapshotOption 

type SnapshotOption func(*volumeArgsV2) error

func WithReadOnlySnapshot 

func WithReadOnlySnapshot() SnapshotOption

WithReadOnlySnapshot sets the snapshot to be read-only.

func WithSnapshotName 

func WithSnapshotName(name string) SnapshotOption

WithSnapshotName sets the name of the snapshot to be created.

func WithSnapshotPath 

func WithSnapshotPath(path string) SnapshotOption

WithSnapshotPath sets an absolute path for the snapshot to be created.

type TreeItem 

type TreeItem struct {
	Data []byte
	Name string
}

func (TreeItem) DirItem 

func (t TreeItem) DirItem() (BtrfsDirItem, error)

func (TreeItem) InodeItem 

func (t TreeItem) InodeItem() (BtrfsInodeItem, error)

func (TreeItem) InodeRef 

func (t TreeItem) InodeRef() (BtrfsInodeRef, error)

func (TreeItem) RootItem 

func (t TreeItem) RootItem() (BtrfsRootItem, error)

func (TreeItem) RootRef 

func (t TreeItem) RootRef() (BtrfsRootRef, string, error)

type TreeIterFunc 

type TreeIterFunc func(hdr SearchHeader, item TreeItem, lastErr error) error

TreeIterFunc is a function that is called for each item found in the tree. If the function returns any error it is passed as lastErr to the next call of the function. If the error wraps the ErrStopWalk error, the iteration is stopped.

Source Files

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