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 Go to latest Published: Feb 25, 2020 License: BSD-3-Clause, BSD-3-Clause, BSD-3-Clause Imports: 32 Imported by: 0

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Index

Constants

View Source 
const (
	// MaxBlockSizeBytesDefault is the default maximum block size for KBFS.
	// 512K blocks by default, block changes embedded max == 8K.
	// Block size was chosen somewhat arbitrarily by trying to
	// minimize the overall size of the history written by a user when
	// appending 1KB writes to a file, up to a 1GB total file.  Here
	// is the output of a simple script that approximates that
	// calculation:
	//
	// Total history size for 0065536-byte blocks: 1134341128192 bytes
	// Total history size for 0131072-byte blocks: 618945052672 bytes
	// Total history size for 0262144-byte blocks: 412786622464 bytes
	// Total history size for 0524288-byte blocks: 412786622464 bytes
	// Total history size for 1048576-byte blocks: 618945052672 bytes
	// Total history size for 2097152-byte blocks: 1134341128192 bytes
	// Total history size for 4194304-byte blocks: 2216672886784 bytes
	MaxBlockSizeBytesDefault = 512 << 10
	// MaxNameBytesDefault is the max supported size of a directory
	// entry name.
	MaxNameBytesDefault = 255
	// BackgroundTaskTimeout is the timeout for any background task.
	BackgroundTaskTimeout = 1 * time.Minute
)

Variables

View Source 
var BPSize = uint64(reflect.TypeOf(BlockPointer{}).Size())

BPSize is the estimated size of a block pointer in bytes.

Functions

func ReadyBlock 

func ReadyBlock(
	ctx context.Context, bcache BlockCache, rp ReadyProvider,
	kmd libkey.KeyMetadata, block Block, chargedTo keybase1.UserOrTeamID,
	bType keybase1.BlockType) (
	info BlockInfo, plainSize int, readyBlockData ReadyBlockData, err error)

ReadyBlock is a thin wrapper around ReadyProvider.Ready() that handles checking for duplicates.

func SplitFileExtension 

func SplitFileExtension(path string) (string, string)

SplitFileExtension splits filename into a base name and the extension.

Types

type BadDataError 

type BadDataError struct {
	ID kbfsblock.ID
}

BadDataError indicates that KBFS is storing corrupt data for a block.

func (BadDataError) Error 

func (e BadDataError) Error() string

Error implements the error interface for BadDataError

type BadSplitError 

type BadSplitError struct {
}

BadSplitError indicates that the BlockSplitter has an error.

func (BadSplitError) Error 

func (e BadSplitError) Error() string

Error implements the error interface for BadSplitError

type Block 

type Block interface {
	Versioner
	// GetEncodedSize returns the encoded size of this block, but only
	// if it has been previously set; otherwise it returns 0.
	GetEncodedSize() uint32
	// SetEncodedSize sets the encoded size of this block, locally
	// caching it.  The encoded size is not serialized.
	SetEncodedSize(size uint32)
	// NewEmpty returns a new block of the same type as this block
	NewEmpty() Block
	// NewEmptier returns a function that creates a new block of the
	// same type as this block.
	NewEmptier() func() Block
	// Set sets this block to the same value as the passed-in block
	Set(other Block)
	// ToCommonBlock retrieves this block as a *CommonBlock.
	ToCommonBlock() *CommonBlock
	// IsIndirect indicates whether this block contains indirect pointers.
	IsIndirect() bool
	// IsTail returns true if this block doesn't point to any other
	// blocks, either indirectly or in child directory entries.
	IsTail() bool
	// OffsetExceedsData returns true if `off` is greater than the
	// data contained in a direct block, assuming it starts at
	// `startOff`.  Note that the offset of the next block isn't
	// relevant; this function should only indicate whether the offset
	// is greater than what currently could be stored in this block.
	OffsetExceedsData(startOff, off Offset) bool
	// BytesCanBeDirtied returns the number of bytes that should be
	// marked as dirtied if this block is dirtied.
	BytesCanBeDirtied() int64
}

Block just needs to be (de)serialized using msgpack

func NewCommonBlock 

func NewCommonBlock() Block

NewCommonBlock returns a generic block, unsuitable for caching.

func NewDirBlock 

func NewDirBlock() Block

NewDirBlock creates a new, empty DirBlock.

func NewFileBlock 

func NewFileBlock() Block

NewFileBlock creates a new, empty FileBlock.

type BlockCache 

type BlockCache interface {
	BlockCacheSimple
	// CheckForKnownPtr sees whether this cache has a transient
	// entry for the given file block, which must be a direct file
	// block containing data).  Returns the full BlockPointer
	// associated with that ID, including key and data versions.
	// If no ID is known, return an uninitialized BlockPointer and
	// a nil error.
	CheckForKnownPtr(tlf tlf.ID, block *FileBlock) (BlockPointer, error)
	// DeleteTransient removes the transient entry for the given
	// ID from the cache, as well as any cached IDs so the block
	// won't be reused.
	DeleteTransient(id kbfsblock.ID, tlf tlf.ID) error
	// Delete removes the permanent entry for the non-dirty block
	// associated with the given block ID from the cache.  No
	// error is returned if no block exists for the given ID.
	DeletePermanent(id kbfsblock.ID) error
	// DeleteKnownPtr removes the cached ID for the given file
	// block. It does not remove the block itself.
	DeleteKnownPtr(tlf tlf.ID, block *FileBlock) error
	// GetWithLifetime retrieves a block from the cache, along with
	// the block's lifetime.
	GetWithLifetime(ptr BlockPointer) (
		block Block, lifetime BlockCacheLifetime, err error)

	// SetCleanBytesCapacity atomically sets clean bytes capacity for block
	// cache.
	SetCleanBytesCapacity(capacity uint64)

	// GetCleanBytesCapacity atomically gets clean bytes capacity for block
	// cache.
	GetCleanBytesCapacity() (capacity uint64)
}

BlockCache specifies the interface of BlockCacheSimple, and also more advanced and internal methods.

type BlockCacheHashBehavior 

type BlockCacheHashBehavior int

BlockCacheHashBehavior denotes whether the cache should hash the plaintext of a new block or not. 

const (
	// SkipCacheHash means that the plaintext of a block should not be hashed.
	SkipCacheHash BlockCacheHashBehavior = iota
	// DoCacheHash means that the plaintext of a block should be hashed.
	DoCacheHash
)

type BlockCacheLifetime 

type BlockCacheLifetime int

BlockCacheLifetime denotes the lifetime of an entry in BlockCache. 

const (
	// NoCacheEntry means that the entry will not be cached.
	NoCacheEntry BlockCacheLifetime = iota
	// TransientEntry means that the cache entry may be evicted at
	// any time.
	TransientEntry
	// PermanentEntry means that the cache entry must remain until
	// explicitly removed from the cache.
	PermanentEntry
)

func (BlockCacheLifetime) String 

func (l BlockCacheLifetime) String() string

type BlockCacheSimple 

type BlockCacheSimple interface {
	// Get gets the block associated with the given block ID.
	Get(ptr BlockPointer) (Block, error)
	// Put stores the final (content-addressable) block associated
	// with the given block ID. If lifetime is TransientEntry, then it
	// is assumed that the block exists on the server and the entry
	// may be evicted from the cache at any time. If lifetime is
	// PermanentEntry, then it is assumed that the block doesn't exist
	// on the server and must remain in the cache until explicitly
	// removed. As an intermediary state, as when a block is being
	// sent to the server, the block may be put into the cache both
	// with TransientEntry and PermanentEntry -- these are two
	// separate entries. This is fine, since the block should be the
	// same.  `hashBehavior` indicates whether the plaintext contents
	// of transient, direct blocks should be hashed, in order to
	// identify blocks that can be de-duped.
	Put(ptr BlockPointer, tlf tlf.ID, block Block,
		lifetime BlockCacheLifetime, hashBehavior BlockCacheHashBehavior) error
}

BlockCacheSimple gets and puts plaintext dir blocks and file blocks into a cache. These blocks are immutable and identified by their content hash.

type BlockCacheStandard 

type BlockCacheStandard struct {
	// contains filtered or unexported fields
}

BlockCacheStandard implements the BlockCache interface by storing blocks in an in-memory LRU cache. Clean blocks are identified internally by just their block ID (since blocks are immutable and content-addressable).

func NewBlockCacheStandard 

func NewBlockCacheStandard(transientCapacity int,
	cleanBytesCapacity uint64) *BlockCacheStandard

NewBlockCacheStandard constructs a new BlockCacheStandard instance with the given transient capacity (in number of entries) and the clean bytes capacity, which is the total of number of bytes allowed between the transient and permanent clean caches. If putting a block will exceed this bytes capacity, transient entries are evicted until the block will fit in capacity.

func (*BlockCacheStandard) CheckForKnownPtr 

func (b *BlockCacheStandard) CheckForKnownPtr(tlf tlf.ID, block *FileBlock) (
	BlockPointer, error)

CheckForKnownPtr implements the BlockCache interface for BlockCacheStandard.

func (*BlockCacheStandard) DeleteKnownPtr 

func (b *BlockCacheStandard) DeleteKnownPtr(tlf tlf.ID, block *FileBlock) error

DeleteKnownPtr implements the BlockCache interface for BlockCacheStandard.

func (*BlockCacheStandard) DeletePermanent 

func (b *BlockCacheStandard) DeletePermanent(id kbfsblock.ID) error

DeletePermanent implements the BlockCache interface for BlockCacheStandard.

func (*BlockCacheStandard) DeleteTransient 

func (b *BlockCacheStandard) DeleteTransient(
	id kbfsblock.ID, tlf tlf.ID) error

DeleteTransient implements the BlockCache interface for BlockCacheStandard.

func (*BlockCacheStandard) Get 

func (b *BlockCacheStandard) Get(ptr BlockPointer) (Block, error)

Get implements the BlockCache interface for BlockCacheStandard.

func (*BlockCacheStandard) GetCleanBytesCapacity 

func (b *BlockCacheStandard) GetCleanBytesCapacity() (capacity uint64)

GetCleanBytesCapacity implements the BlockCache interface for BlockCacheStandard.

func (*BlockCacheStandard) GetWithLifetime 

func (b *BlockCacheStandard) GetWithLifetime(ptr BlockPointer) (
	Block, BlockCacheLifetime, error)

GetWithLifetime implements the BlockCache interface for BlockCacheStandard.

func (*BlockCacheStandard) NumCleanTransientBlocks 

func (b *BlockCacheStandard) NumCleanTransientBlocks() int

NumCleanTransientBlocks returns the number of blocks in the cache with transient lifetimes.

func (*BlockCacheStandard) Put 

func (b *BlockCacheStandard) Put(
	ptr BlockPointer, tlf tlf.ID, block Block,
	lifetime BlockCacheLifetime, hashBehavior BlockCacheHashBehavior) error

Put implements the BlockCache interface for BlockCacheStandard. This method is idempotent for a given ptr, but that invariant is not currently goroutine-safe, and it does not hold if a block size changes between Puts. That is, we assume that a cached block associated with a given pointer will never change its size, even when it gets Put into the cache again.

func (*BlockCacheStandard) SetCleanBytesCapacity 

func (b *BlockCacheStandard) SetCleanBytesCapacity(capacity uint64)

SetCleanBytesCapacity implements the BlockCache interface for BlockCacheStandard.

type BlockDirectType 

type BlockDirectType int

BlockDirectType indicates to what kind of block (direct or indirect) a BlockPointer points. 

const (
	// UnknownDirectType indicates an old block that was written
	// before we started labeling pointers.
	UnknownDirectType BlockDirectType = 0
	// DirectBlock indicates the pointed-to block has no indirect
	// pointers.
	DirectBlock BlockDirectType = 1
	// IndirectBlock indicates the pointed-to block has indirect
	// pointers.
	IndirectBlock BlockDirectType = 2
)

func (BlockDirectType) String 

func (bdt BlockDirectType) String() string

type BlockInfo 

type BlockInfo struct {
	BlockPointer
	// When non-zero, the size of the encoded (and possibly
	// encrypted) data contained in the block. When non-zero,
	// always at least the size of the plaintext data contained in
	// the block.
	EncodedSize uint32 `codec:"e"`
}

BlockInfo contains all information about a block in KBFS and its contents.

NOTE: Don't add or modify anything in this struct without considering how old clients will handle them.

func (BlockInfo) String 

func (bi BlockInfo) String() string

type BlockPointer 

type BlockPointer struct {
	ID         kbfsblock.ID    `codec:"i"`
	KeyGen     kbfsmd.KeyGen   `codec:"k"`           // if valid, which generation of the TLF{Writer,Reader}KeyBundle to use.
	DataVer    Ver             `codec:"d"`           // if valid, which version of the KBFS data structures is pointed to
	DirectType BlockDirectType `codec:"t,omitempty"` // the type (direct, indirect, or unknown [if omitted]) of the pointed-to block
	kbfsblock.Context
}

BlockPointer contains the identifying information for a block in KBFS.

NOTE: Don't add or modify anything in this struct without considering how old clients will handle them. 

var ZeroPtr BlockPointer

ZeroPtr represents an empty BlockPointer.

func (BlockPointer) IsInitialized 

func (p BlockPointer) IsInitialized() bool

IsInitialized returns whether or not this BlockPointer has non-nil data.

func (BlockPointer) IsValid 

func (p BlockPointer) IsValid() bool

IsValid returns whether the block pointer is valid. A zero block pointer is considered invalid.

func (BlockPointer) Ref 

func (p BlockPointer) Ref() BlockRef

Ref returns the BlockRef equivalent of this pointer.

func (BlockPointer) String 

func (p BlockPointer) String() string

type BlockPutState 

type BlockPutState interface {
	AddNewBlock(
		ctx context.Context, blockPtr BlockPointer, block Block,
		readyBlockData ReadyBlockData, syncedCb func() error) error
	SaveOldPtr(ctx context.Context, oldPtr BlockPointer) error
	Ptrs() []BlockPointer
	GetBlock(ctx context.Context, blockPtr BlockPointer) (Block, error)
}

BlockPutState is an interface for keeping track of readied blocks before putting them to the bserver.

type BlockRef 

type BlockRef struct {
	ID       kbfsblock.ID
	RefNonce kbfsblock.RefNonce
}

BlockRef is a block ID/ref nonce pair, which defines a unique reference to a block.

func (BlockRef) IsValid 

func (r BlockRef) IsValid() bool

IsValid returns true exactly when ID.IsValid() does.

func (BlockRef) String 

func (r BlockRef) String() string

type BlockReqType 

type BlockReqType int

BlockReqType indicates whether an operation makes block modifications or not 

const (
	// BlockRead indicates a block read request.
	BlockRead BlockReqType = iota
	// BlockWrite indicates a block write request.
	BlockWrite
	// BlockReadParallel indicates a block read request that is
	// happening from a different goroutine than the blockLock rlock
	// holder, using the same lState.
	BlockReadParallel
	// BlockLookup indicates a lookup for a block for the purposes of
	// creating a new node in the node cache for it; avoid any unlocks
	// as part of the lookup process.
	BlockLookup
)

type BlockSplitter 

type BlockSplitter interface {
	// CopyUntilSplit copies data into the block until we reach the
	// point where we should split, but only if writing to the end of
	// the last block.  If this is writing into the middle of a file,
	// just copy everything that will fit into the block, and assume
	// that block boundaries will be fixed later. Return how much was
	// copied.
	CopyUntilSplit(
		block *FileBlock, lastBlock bool, data []byte, off int64) int64

	// CheckSplit, given a block, figures out whether it ends at the
	// right place.  If so, return 0.  If not, return either the
	// offset in the block where it should be split, or -1 if more
	// bytes from the next block should be appended.
	CheckSplit(block *FileBlock) int64

	// MaxPtrsPerBlock describes the number of indirect pointers we
	// can fit into one indirect block.
	MaxPtrsPerBlock() int

	// ShouldEmbedData decides whether we should keep the data of size
	// `size` embedded in the MD or not.
	ShouldEmbedData(size uint64) bool

	// SplitDirIfNeeded splits a direct DirBlock into multiple blocks
	// if needed.  It may modify `block`.  If a split isn't needed, it
	// returns a one-element slice containing `block`.  If a split is
	// needed, it returns a non-nil offset for the new block.
	SplitDirIfNeeded(block *DirBlock) ([]*DirBlock, *StringOffset)
}

BlockSplitter decides when a file block needs to be split

type BlockSplitterSimple 

type BlockSplitterSimple struct {
	// contains filtered or unexported fields
}

BlockSplitterSimple implements the BlockSplitter interface by using a simple max-size algorithm to determine when to split blocks.

func NewBlockSplitterSimple 

func NewBlockSplitterSimple(desiredBlockSize int64,
	blockChangeEmbedMaxSize uint64, codec kbfscodec.Codec) (
	*BlockSplitterSimple, error)

NewBlockSplitterSimple creates a new BlockSplittleSimple and adjusts the max size to try to match the desired size for file blocks, given the overhead of encoding a file block and the round-up padding we do.

func NewBlockSplitterSimpleExact 

func NewBlockSplitterSimpleExact(
	maxSize int64, maxPtrsPerBlock int, blockChangeEmbedMaxSize uint64) (
	*BlockSplitterSimple, error)

NewBlockSplitterSimpleExact returns a BlockSplitterSimple with the max block size set to an exact value.

func (*BlockSplitterSimple) CheckSplit 

func (b *BlockSplitterSimple) CheckSplit(block *FileBlock) int64

CheckSplit implements the BlockSplitter interface for BlockSplitterSimple.

func (*BlockSplitterSimple) CopyUntilSplit 

func (b *BlockSplitterSimple) CopyUntilSplit(
	block *FileBlock, lastBlock bool, data []byte, off int64) int64

CopyUntilSplit implements the BlockSplitter interface for BlockSplitterSimple.

func (*BlockSplitterSimple) MaxPtrsPerBlock 

func (b *BlockSplitterSimple) MaxPtrsPerBlock() int

MaxPtrsPerBlock implements the BlockSplitter interface for BlockSplitterSimple.

func (*BlockSplitterSimple) MaxSize 

func (b *BlockSplitterSimple) MaxSize() int64

MaxSize returns the max block size.

func (*BlockSplitterSimple) SetBlockChangeEmbedMaxSizeForTesting 

func (b *BlockSplitterSimple) SetBlockChangeEmbedMaxSizeForTesting(
	newSize uint64)

SetBlockChangeEmbedMaxSizeForTesting sets the max size for block change embeds, which is useful for testing. It is not goroutine-safe.

func (*BlockSplitterSimple) SetMaxDirEntriesByBlockSize 

func (b *BlockSplitterSimple) SetMaxDirEntriesByBlockSize(
	codec kbfscodec.Codec) error

SetMaxDirEntriesByBlockSize sets the maximum number of directory entries per directory block, based on the maximum block size. If the `KEYBASE_BSPLIT_MAX_DIR_ENTRIES` is set, this function does nothing.

func (*BlockSplitterSimple) SetMaxDirEntriesPerBlockForTesting 

func (b *BlockSplitterSimple) SetMaxDirEntriesPerBlockForTesting(newMax int)

SetMaxDirEntriesPerBlockForTesting sets the max dir entries for a block, which is useful for testing. It is not goroutine-safe.

func (*BlockSplitterSimple) ShouldEmbedData 

func (b *BlockSplitterSimple) ShouldEmbedData(size uint64) bool

ShouldEmbedData implements the BlockSplitter interface for BlockSplitterSimple.

func (*BlockSplitterSimple) SplitDirIfNeeded 

func (b *BlockSplitterSimple) SplitDirIfNeeded(block *DirBlock) (
	[]*DirBlock, *StringOffset)

SplitDirIfNeeded implements the BlockSplitter interface for BlockSplitterSimple.

type BlockWithPtrs 

type BlockWithPtrs interface {
	Block

	// FirstOffset returns the offset of the indirect pointer that
	// points to the first (left-most) block in a block tree.
	FirstOffset() Offset
	// NumIndirectPtrs returns the number of indirect pointers in this
	// block.  The behavior is undefined when called on a non-indirect
	// block.
	NumIndirectPtrs() int
	// IndirectPtr returns the block info and offset for the indirect
	// pointer at index `i`. The behavior is undefined when called on
	// a non-indirect block.
	IndirectPtr(i int) (BlockInfo, Offset)
	// AppendNewIndirectPtr appends a new indirect pointer at the
	// given offset.
	AppendNewIndirectPtr(ptr BlockPointer, off Offset)
	// ClearIndirectPtrSize clears the encoded size of the indirect
	// pointer stored at index `i`.
	ClearIndirectPtrSize(i int)
	// SetIndirectPtrType set the type of the indirect pointer stored
	// at index `i`.
	SetIndirectPtrType(i int, dt BlockDirectType)
	// SetIndirectPtrOff set the offset of the indirect pointer stored
	// at index `i`.
	SetIndirectPtrOff(i int, off Offset)
	// SetIndirectPtrInfo sets the block info of the indirect pointer
	// stored at index `i`.
	SetIndirectPtrInfo(i int, info BlockInfo)
	// SwapIndirectPtrs swaps the indirect ptr at `i` in this block
	// with the one at `otherI` in `other`.
	SwapIndirectPtrs(i int, other BlockWithPtrs, otherI int)
}

BlockWithPtrs defines methods needed for interacting with indirect pointers.

func NewDirBlockWithPtrs 

func NewDirBlockWithPtrs(isInd bool) BlockWithPtrs

NewDirBlockWithPtrs creates a new, empty DirBlock.

func NewFileBlockWithPtrs 

func NewFileBlockWithPtrs(isInd bool) BlockWithPtrs

NewFileBlockWithPtrs creates a new, empty FileBlock.

type BranchName 

type BranchName string

BranchName is the name given to a KBFS branch, for a particular top-level folder. Currently, the notion of a "branch" is client-side only, and can be used to specify which root to use for a top-level folder. (For example, viewing a historical archive could use a different branch name.) 

const (
	// MasterBranch represents the mainline branch for a top-level
	// folder.  Set to the empty string so that the default will be
	// the master branch.
	MasterBranch BranchName = ""
)

func MakeConflictBranchName 

func MakeConflictBranchName(h *tlfhandle.Handle) (BranchName, bool)

MakeConflictBranchName returns a branch name specifying a conflict date, if possible.

func MakeRevBranchName 

func MakeRevBranchName(rev kbfsmd.Revision) BranchName

MakeRevBranchName returns a branch name specifying an archive branch pinned to the given revision number.

func (BranchName) IsArchived 

func (bn BranchName) IsArchived() bool

IsArchived returns true if the branch specifies an archived revision.

func (BranchName) IsLocalConflict 

func (bn BranchName) IsLocalConflict() bool

IsLocalConflict returns true if the branch specifies a local conflict branch.

func (BranchName) RevisionIfSpecified 

func (bn BranchName) RevisionIfSpecified() (kbfsmd.Revision, bool)

RevisionIfSpecified returns a valid revision number and true if `bn` is a revision branch.

type CachePutCacheFullError 

type CachePutCacheFullError struct {
	BlockID kbfsblock.ID
}

CachePutCacheFullError indicates that a cache put failed because the cache was full.

func (CachePutCacheFullError) Error 

func (e CachePutCacheFullError) Error() string

type CommonBlock 

type CommonBlock struct {
	// IsInd indicates where this block is so big it requires indirect pointers
	IsInd bool `codec:"s"`

	codec.UnknownFieldSetHandler
	// contains filtered or unexported fields
}

CommonBlock holds block data that is common for both subdirectories and files.

func NewCommonBlockForTesting 

func NewCommonBlockForTesting(
	isInd bool, cachedEncodedSize uint32) CommonBlock

NewCommonBlockForTesting returns a common block with some of the internal state set, which is useful for testing.

func (*CommonBlock) BytesCanBeDirtied 

func (cb *CommonBlock) BytesCanBeDirtied() int64

BytesCanBeDirtied implements the Block interface for CommonBlock.

func (*CommonBlock) DataVersion 

func (cb *CommonBlock) DataVersion() Ver

DataVersion returns data version for this block.

func (*CommonBlock) DeepCopy 

func (cb *CommonBlock) DeepCopy() CommonBlock

DeepCopy copies a CommonBlock without the lock.

func (*CommonBlock) GetEncodedSize 

func (cb *CommonBlock) GetEncodedSize() uint32

GetEncodedSize implements the Block interface for CommonBlock

func (*CommonBlock) IsIndirect 

func (cb *CommonBlock) IsIndirect() bool

IsIndirect implements the Block interface for CommonBlock.

func (*CommonBlock) IsTail 

func (cb *CommonBlock) IsTail() bool

IsTail implements the Block interface for CommonBlock.

func (*CommonBlock) NewEmptier 

func (cb *CommonBlock) NewEmptier() func() Block

NewEmptier implements the Block interface for CommonBlock.

func (*CommonBlock) NewEmpty 

func (cb *CommonBlock) NewEmpty() Block

NewEmpty implements the Block interface for CommonBlock.

func (*CommonBlock) OffsetExceedsData 

func (cb *CommonBlock) OffsetExceedsData(_, _ Offset) bool

OffsetExceedsData implements the Block interface for CommonBlock.

func (*CommonBlock) Set 

func (cb *CommonBlock) Set(other Block)

Set implements the Block interface for CommonBlock.

func (*CommonBlock) SetEncodedSize 

func (cb *CommonBlock) SetEncodedSize(size uint32)

SetEncodedSize implements the Block interface for CommonBlock

func (*CommonBlock) ToCommonBlock 

func (cb *CommonBlock) ToCommonBlock() *CommonBlock

ToCommonBlock implements the Block interface for CommonBlock.

type DirBlock 

type DirBlock struct {
	CommonBlock
	// if not indirect, a map of path name to directory entry
	Children map[string]DirEntry `codec:"c,omitempty"`
	// if indirect, contains the indirect pointers to the next level of blocks
	IPtrs []IndirectDirPtr `codec:"i,omitempty"`
}

DirBlock is the contents of a directory

func (*DirBlock) AppendNewIndirectPtr 

func (db *DirBlock) AppendNewIndirectPtr(ptr BlockPointer, off Offset)

AppendNewIndirectPtr implements the BlockWithPtrs interface for FileBlock.

func (*DirBlock) BytesCanBeDirtied 

func (db *DirBlock) BytesCanBeDirtied() int64

BytesCanBeDirtied implements the Block interface for DirBlock.

func (*DirBlock) ClearIndirectPtrSize 

func (db *DirBlock) ClearIndirectPtrSize(i int)

ClearIndirectPtrSize implements the BlockWithPtrs interface for DirBlock.

func (*DirBlock) DataVersion 

func (db *DirBlock) DataVersion() Ver

DataVersion returns data version for this block, which is assumed to have been modified locally.

func (*DirBlock) DeepCopy 

func (db *DirBlock) DeepCopy() *DirBlock

DeepCopy makes a complete copy of a DirBlock

func (*DirBlock) FirstOffset 

func (db *DirBlock) FirstOffset() Offset

FirstOffset implements the Block interface for DirBlock.

func (*DirBlock) IndirectPtr 

func (db *DirBlock) IndirectPtr(i int) (BlockInfo, Offset)

IndirectPtr implements the BlockWithPtrs interface for DirBlock.

func (*DirBlock) IsTail 

func (db *DirBlock) IsTail() bool

IsTail implements the Block interface for DirBlock.

func (*DirBlock) NewEmptier 

func (db *DirBlock) NewEmptier() func() Block

NewEmptier implements the Block interface for DirBlock.

func (*DirBlock) NewEmpty 

func (db *DirBlock) NewEmpty() Block

NewEmpty implements the Block interface for DirBlock

func (*DirBlock) NumIndirectPtrs 

func (db *DirBlock) NumIndirectPtrs() int

NumIndirectPtrs implements the BlockWithPtrs interface for DirBlock.

func (*DirBlock) OffsetExceedsData 

func (db *DirBlock) OffsetExceedsData(startOff, off Offset) bool

OffsetExceedsData implements the Block interface for DirBlock.

func (*DirBlock) Set 

func (db *DirBlock) Set(other Block)

Set implements the Block interface for DirBlock

func (*DirBlock) SetIndirectPtrInfo 

func (db *DirBlock) SetIndirectPtrInfo(i int, info BlockInfo)

SetIndirectPtrInfo implements the BlockWithPtrs interface for DirBlock.

func (*DirBlock) SetIndirectPtrOff 

func (db *DirBlock) SetIndirectPtrOff(i int, off Offset)

SetIndirectPtrOff implements the BlockWithPtrs interface for DirBlock.

func (*DirBlock) SetIndirectPtrType 

func (db *DirBlock) SetIndirectPtrType(i int, dt BlockDirectType)

SetIndirectPtrType implements the BlockWithPtrs interface for DirBlock.

func (*DirBlock) SwapIndirectPtrs 

func (db *DirBlock) SwapIndirectPtrs(i int, other BlockWithPtrs, otherI int)

SwapIndirectPtrs implements the BlockWithPtrs interface for DirBlock.

func (*DirBlock) ToCommonBlock 

func (db *DirBlock) ToCommonBlock() *CommonBlock

ToCommonBlock implements the Block interface for DirBlock.

func (*DirBlock) TotalPlainSizeEstimate 

func (db *DirBlock) TotalPlainSizeEstimate(
	plainSize int, bsplit BlockSplitter) int

TotalPlainSizeEstimate returns an estimate of the plaintext size of this directory block.

type DirData 

type DirData struct {
	// contains filtered or unexported fields
}

DirData is a helper struct for accessing and manipulating data within a directory. It's meant for use within a single scope, not for long-term storage. The caller must ensure goroutine-safety.

func NewDirData 

func NewDirData(
	dir Path, chargedTo keybase1.UserOrTeamID, bsplit BlockSplitter,
	kmd libkey.KeyMetadata, getter dirBlockGetter, cacher dirtyBlockCacher,
	log logger.Logger, vlog *libkb.VDebugLog) *DirData

NewDirData creates a new DirData instance.

func (*DirData) AddEntry 

func (dd *DirData) AddEntry(
	ctx context.Context, newName PathPartString, newDe DirEntry) (
	unrefs []BlockInfo, err error)

AddEntry adds a new entry to this directory.

func (*DirData) GetChildren 

func (dd *DirData) GetChildren(ctx context.Context) (
	children map[PathPartString]EntryInfo, err error)

GetChildren returns a map of all the child EntryInfos in this directory.

func (*DirData) GetDirtyChildPtrs 

func (dd *DirData) GetDirtyChildPtrs(
	ctx context.Context, dirtyBcache IsDirtyProvider) (
	ptrs map[BlockPointer]bool, err error)

GetDirtyChildPtrs returns a set of dirty child pointers (not the root pointer) for the directory.

func (*DirData) GetEntries 

func (dd *DirData) GetEntries(ctx context.Context) (
	children map[PathPartString]DirEntry, err error)

GetEntries returns a map of all the child DirEntrys in this directory.

func (*DirData) GetIndirectDirBlockInfos 

func (dd *DirData) GetIndirectDirBlockInfos(ctx context.Context) (
	[]BlockInfo, error)

GetIndirectDirBlockInfos returns all of the BlockInfos for blocks pointed to by indirect blocks within this directory tree.

func (*DirData) GetTopBlock 

func (dd *DirData) GetTopBlock(ctx context.Context, rtype BlockReqType) (
	*DirBlock, error)

GetTopBlock returns the top-most block in this directory block tree.

func (*DirData) Lookup 

func (dd *DirData) Lookup(ctx context.Context, name PathPartString) (
	DirEntry, error)

Lookup returns the DirEntry for the given entry named by `name` in this directory.

func (*DirData) Ready 

func (dd *DirData) Ready(ctx context.Context, id tlf.ID,
	bcache BlockCache, dirtyBcache IsDirtyProvider,
	rp ReadyProvider, bps BlockPutState,
	topBlock *DirBlock) (map[BlockInfo]BlockPointer, error)

Ready readies all the dirty child blocks for a directory tree with an indirect top-block, and updates their block IDs in their parent block's list of indirect pointers. It returns a map pointing from the new block info from any readied block to its corresponding old block pointer.

func (*DirData) RemoveEntry 

func (dd *DirData) RemoveEntry(ctx context.Context, name PathPartString) (
	unrefs []BlockInfo, err error)

RemoveEntry removes an entry from this directory.

func (*DirData) SetEntry 

func (dd *DirData) SetEntry(
	ctx context.Context, name PathPartString, newDe DirEntry) (
	unrefs []BlockInfo, err error)

SetEntry set an entry to this directory, whether it is new or existing.

func (*DirData) UpdateEntry 

func (dd *DirData) UpdateEntry(
	ctx context.Context, name PathPartString, newDe DirEntry) (
	unrefs []BlockInfo, err error)

UpdateEntry updates an existing entry to this directory.

type DirEntries 

type DirEntries []DirEntryWithName

DirEntries is a slice of `DirEntryWithName` instances.

func DirEntryMapToDirEntries 

func DirEntryMapToDirEntries(entryMap map[string]DirEntry) DirEntries

DirEntryMapToDirEntries returns a `DirEntries` slice of all the entries in the given map.

func (DirEntries) Len 

func (d DirEntries) Len() int

Len implements the sort.Interface interface for DirEntries.

func (DirEntries) Swap 

func (d DirEntries) Swap(i, j int)

Swap implements the sort.Interface interface for DirEntries.

type DirEntriesBySizeAsc 

type DirEntriesBySizeAsc struct{ DirEntries }

DirEntriesBySizeAsc sorts entries in order of ascending name.

func (DirEntriesBySizeAsc) Less 

func (d DirEntriesBySizeAsc) Less(i, j int) bool

Less implements the sort.Interface interface for DirEntriesBySizeAsc.

type DirEntriesBySizeDesc 

type DirEntriesBySizeDesc struct{ DirEntries }

DirEntriesBySizeDesc sorts entries in order of descending name.

func (DirEntriesBySizeDesc) Less 

func (d DirEntriesBySizeDesc) Less(i, j int) bool

Less implements the sort.Interface interface for DirEntriesBySizeDesc.

type DirEntry 

type DirEntry struct {
	BlockInfo
	EntryInfo

	codec.UnknownFieldSetHandler
}

DirEntry is all the data info a directory know about its child.

func (*DirEntry) IsInitialized 

func (de *DirEntry) IsInitialized() bool

IsInitialized returns true if this DirEntry has been initialized.

type DirEntryWithName 

type DirEntryWithName struct {
	DirEntry
	// contains filtered or unexported fields
}

DirEntryWithName combines a DirEntry with the name pointing to that entry within a directory.

type DirtyBlockCache 

type DirtyBlockCache interface {
	IsDirtyProvider
	DirtyBlockCacheSimple

	// Delete removes the dirty block associated with the given block
	// pointer and branch from the cache.  No error is returned if no
	// block exists for the given ID.
	Delete(tlfID tlf.ID, ptr BlockPointer, branch BranchName) error
	// IsAnyDirty returns whether there are any dirty blocks in the
	// cache. tlfID may be ignored.
	IsAnyDirty(tlfID tlf.ID) bool
	// RequestPermissionToDirty is called whenever a user wants to
	// write data to a file.  The caller provides an estimated number
	// of bytes that will become dirty -- this is difficult to know
	// exactly without pre-fetching all the blocks involved, but in
	// practice we can just use the number of bytes sent in via the
	// Write. It returns a channel that blocks until the cache is
	// ready to receive more dirty data, at which point the channel is
	// closed.  The user must call
	// `UpdateUnsyncedBytes(-estimatedDirtyBytes)` once it has
	// completed its write and called `UpdateUnsyncedBytes` for all
	// the exact dirty block sizes.
	RequestPermissionToDirty(ctx context.Context, tlfID tlf.ID,
		estimatedDirtyBytes int64) (DirtyPermChan, error)
	// UpdateUnsyncedBytes is called by a user, who has already been
	// granted permission to write, with the delta in block sizes that
	// were dirtied as part of the write.  So for example, if a
	// newly-dirtied block of 20 bytes was extended by 5 bytes, they
	// should send 25.  If on the next write (before any syncs), bytes
	// 10-15 of that same block were overwritten, they should send 0
	// over the channel because there were no new bytes.  If an
	// already-dirtied block is truncated, or if previously requested
	// bytes have now been updated more accurately in previous
	// requests, newUnsyncedBytes may be negative.  wasSyncing should
	// be true if `BlockSyncStarted` has already been called for this
	// block.
	UpdateUnsyncedBytes(tlfID tlf.ID, newUnsyncedBytes int64, wasSyncing bool)
	// UpdateSyncingBytes is called when a particular block has
	// started syncing, or with a negative number when a block is no
	// longer syncing due to an error (and BlockSyncFinished will
	// never be called).
	UpdateSyncingBytes(tlfID tlf.ID, size int64)
	// BlockSyncFinished is called when a particular block has
	// finished syncing, though the overall sync might not yet be
	// complete.  This lets the cache know it might be able to grant
	// more permission to writers.
	BlockSyncFinished(tlfID tlf.ID, size int64)
	// SyncFinished is called when a complete sync has completed and
	// its dirty blocks have been removed from the cache.  This lets
	// the cache know it might be able to grant more permission to
	// writers.
	SyncFinished(tlfID tlf.ID, size int64)
	// ShouldForceSync returns true if the sync buffer is full enough
	// to force all callers to sync their data immediately.
	ShouldForceSync(tlfID tlf.ID) bool

	// Shutdown frees any resources associated with this instance.  It
	// returns an error if there are any unsynced blocks.
	Shutdown() error
}

DirtyBlockCache gets and puts plaintext dir blocks and file blocks into a cache, which have been modified by the application and not yet committed on the KBFS servers. They are identified by a (potentially random) ID that may not have any relationship with their context, along with a Branch in case the same TLF is being modified via multiple branches. Dirty blocks are never evicted, they must be deleted explicitly.

type DirtyBlockCacheSimple 

type DirtyBlockCacheSimple interface {
	// Get gets the block associated with the given block ID.  Returns
	// the dirty block for the given ID, if one exists.
	Get(
		ctx context.Context, tlfID tlf.ID, ptr BlockPointer,
		branch BranchName) (Block, error)
	// Put stores a dirty block currently identified by the
	// given block pointer and branch name.
	Put(
		ctx context.Context, tlfID tlf.ID, ptr BlockPointer, branch BranchName,
		block Block) error
}

DirtyBlockCacheSimple is a bare-bones interface for a dirty block cache.

type DirtyBlockCacheStandard 

type DirtyBlockCacheStandard struct {
	// contains filtered or unexported fields
}

DirtyBlockCacheStandard implements the DirtyBlockCache interface by storing blocks in an in-memory cache. Dirty blocks are identified by their block ID, branch name, and reference nonce, since the same block may be forked and modified on different branches and under different references simultaneously.

DirtyBlockCacheStandard controls how fast uses can write into KBFS, and does so with a TCP-like slow-start algorithm that adjusts itself according to how fast bytes are synced to the server. Conceptually, there are two buffers: 

syncBuf: The bytes that are currently syncing, or have finished
syncing, back to the servers.  Each TLF has only one sync at a
time, but multiple TLFs may be syncing at the same time.  We also
track how many bytes within this buffer have finished syncing.

waitBuf: The bytes that have not yet begun syncing to the
servers.  Again, this can be for multiple TLFs, and from multiple
files within a TLF.  In the TCP analogy, think of this as the
congestion window (cwnd).

The goal is to make sure that syncBuf can always be transmitted to the server within the file system operation timeout forced on us by the layer that interacts with the file system (19 seconds on OS X and Windows, defaults to 30 seconds for other layers if not already set). In fact, ideally the data would be transmitted in HALF of the file system operation timeout, in case a user Sync operation gets blocked behind a background Sync operation when there is significant data in waitBuf. At the same time, we want it to be as big as possible, because we get the best performance when writing lots of blocks in parallel to the servers. So, we want an algorithm that allows waitBuf to grow, without causing the next sync (or write, or setattr, etc) operation to timeout. For the purposes of this discussion, let's assume there is only one active TLF at a time.

We allow the user to set a min, start, and max size for waitBuf. Whenever a sync starts, bytes are transferred from waitBuf into syncBuf and a timer is started. When a sync completes successfully, the number of bytes synced is added to the allowed size of waitBuf (i.e., "additive increase" == exponential growth). However, if the number of sync'd bytes is smaller than the min waitBuf size, we don't do additive increase (because we haven't really tested the throughput of the server connection in that case).

If the sync takes more than 33% of half the overall operation timeout, the size of waitBuf is reduced by that same percentage (i.e., "multiplicative decrease"), and any outstanding bytes in the sync will not be used in the "additive increase" phase when the sync completes (they are considered "lost" in the TCP analogy, even though they should eventually succeed). The 33% limit was chosen mostly by trial and error, although if you assume that capacity(waitBuf) will double after each sync, then `2*len(syncBuf) == capacity(waitBuf)`, so at any given point there can be about 3*capacity(syncBuf) bytes buffered; so if syncBuf can't be sync'd in a third of the overall timeout, the next waitBuf should be reduced.

Finally, we need to make sure that the Write calls that are filling up waitBuf while a sync is happening don't timeout. But, we also need to fill waitBuf quickly, so that the next sync is ready to go as soon as the first one completes. Here we implement a compromise. Allow waitBuf to fill up instantly until it holds capacity(syncBuf) bytes. After that, allow it to fill up to 2*capacity(syncBuf), but artificially delay each write by adding backpressure, by some fraction of the system operation timeout that matches the fraction of the progress the buffer has made between capacity(syncBuf) and 2*capacity(syncBuf). As soon as the sync completes, any delayed write is unblocked and gets to start filling up the buffers again.

To avoid keeping the buffer capacity large when network conditions suddenly worsen (say after a laptop sleep when it comes back online on a new, worse network), the capacity is reset back to the minimum if resetBufferCapTime passes without any large syncs. TODO: in the future it might make sense to decrease the buffer capacity, rather than resetting it to the minimum?

func NewDirtyBlockCacheStandard 

func NewDirtyBlockCacheStandard(
	clock idutil.Clock, log logger.Logger, vlog *libkb.VDebugLog,
	minSyncBufCap int64, maxSyncBufCap int64,
	startSyncBufCap int64) *DirtyBlockCacheStandard

NewDirtyBlockCacheStandard constructs a new BlockCacheStandard instance. The min and max buffer capacities define the possible range of how many bytes we'll try to sync in any one sync, and the start size defines the initial buffer size.

func SimpleDirtyBlockCacheStandard 

func SimpleDirtyBlockCacheStandard() *DirtyBlockCacheStandard

SimpleDirtyBlockCacheStandard that can only handle block put/get/delete requests; it cannot track dirty bytes.

func (*DirtyBlockCacheStandard) BlockSyncFinished 

func (d *DirtyBlockCacheStandard) BlockSyncFinished(_ tlf.ID, size int64)

BlockSyncFinished implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) Delete 

func (d *DirtyBlockCacheStandard) Delete(_ tlf.ID, ptr BlockPointer,
	branch BranchName) error

Delete implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) Get 

func (d *DirtyBlockCacheStandard) Get(
	_ context.Context, _ tlf.ID, ptr BlockPointer, branch BranchName) (
	Block, error)

Get implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) IsAnyDirty 

func (d *DirtyBlockCacheStandard) IsAnyDirty(_ tlf.ID) bool

IsAnyDirty implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) IsDirty 

func (d *DirtyBlockCacheStandard) IsDirty(_ tlf.ID, ptr BlockPointer,
	branch BranchName) (isDirty bool)

IsDirty implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) Put 

func (d *DirtyBlockCacheStandard) Put(
	_ context.Context, _ tlf.ID, ptr BlockPointer, branch BranchName,
	block Block) error

Put implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) RequestPermissionToDirty 

func (d *DirtyBlockCacheStandard) RequestPermissionToDirty(
	ctx context.Context, _ tlf.ID, estimatedDirtyBytes int64) (
	DirtyPermChan, error)

RequestPermissionToDirty implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) ShouldForceSync 

func (d *DirtyBlockCacheStandard) ShouldForceSync(_ tlf.ID) bool

ShouldForceSync implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) Shutdown 

func (d *DirtyBlockCacheStandard) Shutdown() error

Shutdown implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) Size 

func (d *DirtyBlockCacheStandard) Size() int

Size returns the number of blocks currently in the cache.

func (*DirtyBlockCacheStandard) SyncFinished 

func (d *DirtyBlockCacheStandard) SyncFinished(_ tlf.ID, size int64)

SyncFinished implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) UpdateSyncingBytes 

func (d *DirtyBlockCacheStandard) UpdateSyncingBytes(_ tlf.ID, size int64)

UpdateSyncingBytes implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

func (*DirtyBlockCacheStandard) UpdateUnsyncedBytes 

func (d *DirtyBlockCacheStandard) UpdateUnsyncedBytes(_ tlf.ID,
	newUnsyncedBytes int64, wasSyncing bool)

UpdateUnsyncedBytes implements the DirtyBlockCache interface for DirtyBlockCacheStandard.

type DirtyFile 

type DirtyFile struct {
	Path Path
	// contains filtered or unexported fields
}

DirtyFile represents a particular file that's been written to, but has not yet completed syncing its dirty blocks to the server.

func NewDirtyFile 

func NewDirtyFile(file Path, dirtyBcache DirtyBlockCache) *DirtyFile

NewDirtyFile constructs a new `DirtyFile` instance.

func (*DirtyFile) AddDeferredNewBytes 

func (df *DirtyFile) AddDeferredNewBytes(bytes int64)

AddDeferredNewBytes adds `bytes` to the count of all the bytes that have been deferred until after the current sync finishes.

func (*DirtyFile) AddErrListener 

func (df *DirtyFile) AddErrListener(listener chan<- error)

AddErrListener adds a callback that will be invoked if an error happens during the sync.

func (*DirtyFile) AssimilateDeferredNewBytes 

func (df *DirtyFile) AssimilateDeferredNewBytes()

AssimilateDeferredNewBytes is called to indicate that any deferred bytes should be included in the count of the next sync.

func (*DirtyFile) BlockNeedsCopy 

func (df *DirtyFile) BlockNeedsCopy(ptr BlockPointer) bool

BlockNeedsCopy returns true if the block should be copied by anyone who next tries to modify it.

func (*DirtyFile) FinishSync 

func (df *DirtyFile) FinishSync() error

FinishSync is called to indicate that a sync has finished successfully.

func (*DirtyFile) IsBlockOrphaned 

func (df *DirtyFile) IsBlockOrphaned(ptr BlockPointer) bool

IsBlockOrphaned returns true if the block has been orphaned and can no longer be reached in the file.

func (*DirtyFile) NotifyErrListeners 

func (df *DirtyFile) NotifyErrListeners(err error)

NotifyErrListeners notifies all registered callbacks that an error happened, if `err` is `nil`. It also resets the registered listeners.

func (*DirtyFile) NumErrListeners 

func (df *DirtyFile) NumErrListeners() int

NumErrListeners returns the number of registered error listeners.

func (*DirtyFile) ResetSyncingBlocksToDirty 

func (df *DirtyFile) ResetSyncingBlocksToDirty()

ResetSyncingBlocksToDirty can be called when a sync failed, and all the syncing blocks need to transition back to being dirty.

func (*DirtyFile) SetBlockDirty 

func (df *DirtyFile) SetBlockDirty(ptr BlockPointer) (
	needsCaching bool, isSyncing bool)

SetBlockDirty transitions a block to a dirty state, and returns whether or not the block needs to be put in the dirty cache (because it isn't yet), and whether or not the block is currently part of a sync in progress.

func (*DirtyFile) SetBlockOrphaned 

func (df *DirtyFile) SetBlockOrphaned(ptr BlockPointer, orphaned bool)

SetBlockOrphaned is called to indicate that a block has been orphaned, and can no longer be reached within the file.

func (*DirtyFile) SetBlockSyncing 

func (df *DirtyFile) SetBlockSyncing(
	ctx context.Context, ptr BlockPointer) error

SetBlockSyncing is called to indicate that the block pointed to by `ptr` is currently being synced.

func (*DirtyFile) UpdateNotYetSyncingBytes 

func (df *DirtyFile) UpdateNotYetSyncingBytes(newBytes int64)

UpdateNotYetSyncingBytes adds `newBytes` to the number of outstanding to-be-synced bytes.

type DirtyPermChan 

type DirtyPermChan <-chan struct{}

DirtyPermChan is a channel that gets closed when the holder has permission to write. We are forced to define it as a type due to a bug in mockgen that can't handle return values with a chan struct{}.

type EntryInfo 

type EntryInfo struct {
	Type    EntryType
	Size    uint64
	SymPath string `codec:",omitempty"` // must be within the same root dir
	// Mtime is in unix nanoseconds
	Mtime int64
	// Ctime is in unix nanoseconds
	Ctime int64
	// If this is a team TLF, we want to track the last writer of an
	// entry, since in the block, only the team ID will be tracked.
	TeamWriter keybase1.UID `codec:"tw,omitempty"`
	// Tracks a skiplist of the previous revisions for this entry.
	PrevRevisions PrevRevisions `codec:"pr,omitempty"`
}

EntryInfo is the (non-block-related) info a directory knows about its child.

NOTE: Don't add or modify anything in this struct without considering how old clients will handle them (since this is embedded in DirEntry).

func EntryInfoFromFileInfo 

func EntryInfoFromFileInfo(fi os.FileInfo) EntryInfo

EntryInfoFromFileInfo converts an `os.FileInfo` into an `EntryInfo`, to the best of our ability to do so. The caller is responsible for filling in `EntryInfo.SymPath`, if needed.

func (EntryInfo) Eq 

func (ei EntryInfo) Eq(other EntryInfo) bool

Eq returns true if `other` is equal to `ei`.

type EntryType 

type EntryType int

EntryType is the type of a directory entry. 

const (
	// File is a regular file.
	File EntryType = iota
	// Exec is an executable file.
	Exec
	// Dir is a directory.
	Dir
	// Sym is a symbolic link.
	Sym

	// FakeFile can be used to indicate a faked-out entry for a file,
	// that will be specially processed by folderBranchOps.
	FakeFile EntryType = 0xfffe
	// FakeDir can be used to indicate a faked-out entry for a directory,
	// that will be specially processed by folderBranchOps.
	FakeDir EntryType = 0xffff
)

func (EntryType) IsFile 

func (et EntryType) IsFile() bool

IsFile returns whether or not this entry points to a file.

func (EntryType) String 

func (et EntryType) String() string

String implements the fmt.Stringer interface for EntryType

type FileBlock 

type FileBlock struct {
	CommonBlock
	// if not indirect, the full contents of this block
	Contents []byte `codec:"c,omitempty"`
	// if indirect, contains the indirect pointers to the next level of blocks
	IPtrs []IndirectFilePtr `codec:"i,omitempty"`
	// contains filtered or unexported fields
}

FileBlock is the contents of a file

func (*FileBlock) AppendNewIndirectPtr 

func (fb *FileBlock) AppendNewIndirectPtr(ptr BlockPointer, off Offset)

AppendNewIndirectPtr implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) BytesCanBeDirtied 

func (fb *FileBlock) BytesCanBeDirtied() int64

BytesCanBeDirtied implements the Block interface for FileBlock.

func (*FileBlock) ClearIndirectPtrSize 

func (fb *FileBlock) ClearIndirectPtrSize(i int)

ClearIndirectPtrSize implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) DataVersion 

func (fb *FileBlock) DataVersion() Ver

DataVersion returns data version for this block, which is assumed to have been modified locally.

func (*FileBlock) DeepCopy 

func (fb *FileBlock) DeepCopy() *FileBlock

DeepCopy makes a complete copy of a FileBlock

func (*FileBlock) FirstOffset 

func (fb *FileBlock) FirstOffset() Offset

FirstOffset implements the Block interface for FileBlock.

func (*FileBlock) GetHash 

func (fb *FileBlock) GetHash() kbfshash.RawDefaultHash

GetHash returns the hash of this FileBlock. If the hash is nil, it first calculates it.

func (*FileBlock) IndirectPtr 

func (fb *FileBlock) IndirectPtr(i int) (BlockInfo, Offset)

IndirectPtr implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) IsTail 

func (fb *FileBlock) IsTail() bool

IsTail implements the Block interface for FileBlock.

func (*FileBlock) NewEmptier 

func (fb *FileBlock) NewEmptier() func() Block

NewEmptier implements the Block interface for FileBlock.

func (*FileBlock) NewEmpty 

func (fb *FileBlock) NewEmpty() Block

NewEmpty implements the Block interface for FileBlock

func (*FileBlock) NumIndirectPtrs 

func (fb *FileBlock) NumIndirectPtrs() int

NumIndirectPtrs implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) OffsetExceedsData 

func (fb *FileBlock) OffsetExceedsData(startOff, off Offset) bool

OffsetExceedsData implements the Block interface for FileBlock.

func (*FileBlock) Set 

func (fb *FileBlock) Set(other Block)

Set implements the Block interface for FileBlock

func (*FileBlock) SetIndirectPtrInfo 

func (fb *FileBlock) SetIndirectPtrInfo(i int, info BlockInfo)

SetIndirectPtrInfo implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) SetIndirectPtrOff 

func (fb *FileBlock) SetIndirectPtrOff(i int, off Offset)

SetIndirectPtrOff implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) SetIndirectPtrType 

func (fb *FileBlock) SetIndirectPtrType(i int, dt BlockDirectType)

SetIndirectPtrType implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) SwapIndirectPtrs 

func (fb *FileBlock) SwapIndirectPtrs(i int, other BlockWithPtrs, otherI int)

SwapIndirectPtrs implements the BlockWithPtrs interface for FileBlock.

func (*FileBlock) ToCommonBlock 

func (fb *FileBlock) ToCommonBlock() *CommonBlock

ToCommonBlock implements the Block interface for FileBlock.

type FileBlockGetter 

type FileBlockGetter func(context.Context, libkey.KeyMetadata, BlockPointer,
	Path, BlockReqType) (fblock *FileBlock, wasDirty bool, err error)

FileBlockGetter is a function that gets a block suitable for reading or writing, and also returns whether the block was already dirty. It may be called from new goroutines, and must handle any required locks accordingly.

type FileData 

type FileData struct {
	// contains filtered or unexported fields
}

FileData is a helper struct for accessing and manipulating data within a file. It's meant for use within a single scope, not for long-term storage. The caller must ensure goroutine-safety.

func NewFileData 

func NewFileData(
	file Path, chargedTo keybase1.UserOrTeamID, bsplit BlockSplitter,
	kmd libkey.KeyMetadata, getter FileBlockGetter,
	cacher dirtyBlockCacher, log logger.Logger,
	vlog *libkb.VDebugLog) *FileData

NewFileData makes a new file data object for the given `file` within the given `kmd`.

func (*FileData) DeepCopy 

func (fd *FileData) DeepCopy(ctx context.Context, dataVer Ver) (
	newTopPtr BlockPointer, allChildPtrs []BlockPointer, err error)

DeepCopy makes a complete copy of this file, deduping leaf blocks and making new random BlockPointers for all indirect blocks. It returns the new top pointer of the copy, and all the new child pointers in the copy.

func (*FileData) FindIPtrsAndClearSize 

func (fd *FileData) FindIPtrsAndClearSize(
	ctx context.Context, topBlock *FileBlock, ptrs map[BlockPointer]bool) (
	found map[BlockPointer]bool, err error)

FindIPtrsAndClearSize looks for the given set of indirect pointers, and returns whether they could be found. As a side effect, it also clears the encoded size for those indirect pointers.

func (*FileData) GetBytes 

func (fd *FileData) GetBytes(ctx context.Context,
	startOff, endOff Int64Offset) (data []byte, err error)

GetBytes returns a buffer containing data from the file, in the half-inclusive range `[startOff, endOff)`. If `endOff` == -1, it returns data until the end of the file.

func (*FileData) GetFileBlockAtOffset 

func (fd *FileData) GetFileBlockAtOffset(ctx context.Context,
	topBlock *FileBlock, off Int64Offset, rtype BlockReqType) (
	ptr BlockPointer, parentBlocks []ParentBlockAndChildIndex,
	block *FileBlock, nextBlockStartOff, startOff Int64Offset,
	wasDirty bool, err error)

GetFileBlockAtOffset returns the leaf file block responsible for the given offset.

func (*FileData) GetIndirectFileBlockInfos 

func (fd *FileData) GetIndirectFileBlockInfos(ctx context.Context) (
	[]BlockInfo, error)

GetIndirectFileBlockInfos returns the block infos contained in all the indirect blocks in this file tree.

func (*FileData) GetIndirectFileBlockInfosWithTopBlock 

func (fd *FileData) GetIndirectFileBlockInfosWithTopBlock(
	ctx context.Context, topBlock *FileBlock) ([]BlockInfo, error)

GetIndirectFileBlockInfosWithTopBlock returns the block infos contained in all the indirect blocks in this file tree, given an already-fetched top block.

func (*FileData) Read 

func (fd *FileData) Read(ctx context.Context, dest []byte,
	startOff Int64Offset) (int64, error)

read fills the `dest` buffer with data from the file, starting at `startOff`. Returns the number of bytes copied. If the read operation nears the deadline set in `ctx`, it returns as big a prefix as possible before reaching the deadline.

func (*FileData) Ready 

func (fd *FileData) Ready(ctx context.Context, id tlf.ID,
	bcache BlockCache, dirtyBcache IsDirtyProvider,
	rp ReadyProvider, bps BlockPutState, topBlock *FileBlock, df *DirtyFile) (
	map[BlockInfo]BlockPointer, error)

Ready readies, if given an indirect top-block, all the dirty child blocks, and updates their block IDs in their parent block's list of indirect pointers. It returns a map pointing from the new block info from any readied block to its corresponding old block pointer.

func (*FileData) ReadyNonLeafBlocksInCopy 

func (fd *FileData) ReadyNonLeafBlocksInCopy(ctx context.Context,
	bcache BlockCache, rp ReadyProvider, bps BlockPutState,
	topBlock *FileBlock) ([]BlockInfo, error)

ReadyNonLeafBlocksInCopy takes a top block that's been copied via deepCopy(), and readies all the non-leaf children of the top block. It adds all readied blocks to the provided `bps`. It returns the BlockInfos for all non-leaf children.

func (*FileData) Split 

func (fd *FileData) Split(ctx context.Context, id tlf.ID,
	dirtyBcache DirtyBlockCache, topBlock *FileBlock, df *DirtyFile) (
	unrefs []BlockInfo, err error)

Split checks, if given an indirect top block of a file, whether any of the dirty leaf blocks in that file need to be split up differently (i.e., if the BlockSplitter is using fingerprinting-based boundaries). It returns the set of blocks that now need to be unreferenced.

func (*FileData) TruncateExtend 

func (fd *FileData) TruncateExtend(ctx context.Context, size uint64,
	topBlock *FileBlock, parentBlocks []ParentBlockAndChildIndex,
	oldDe DirEntry, df *DirtyFile) (
	newDe DirEntry, dirtyPtrs []BlockPointer, err error)

TruncateExtend increases file size to the given size by appending a "hole" to the file. Return params:

  • newDe: a new directory entry with the EncodedSize cleared.
  • dirtyPtrs: a slice of the BlockPointers that have been dirtied during the truncate.

func (*FileData) TruncateShrink 

func (fd *FileData) TruncateShrink(ctx context.Context, size uint64,
	topBlock *FileBlock, oldDe DirEntry) (
	newDe DirEntry, dirtyPtrs []BlockPointer, unrefs []BlockInfo,
	newlyDirtiedChildBytes int64, err error)

TruncateShrink shrinks the file to the given size. Return params:

  • newDe: a new directory entry with the EncodedSize cleared if the file shrunk.
  • dirtyPtrs: a slice of the BlockPointers that have been dirtied during the truncate. This includes any interior indirect blocks that may not have been changed yet, but which will need to change as part of the sync process because of leaf node changes below it.
  • unrefs: a slice of BlockInfos that must be unreferenced as part of an eventual sync of this write. May be non-nil even if err != nil.
  • newlyDirtiedChildBytes is the total amount of block data dirtied by this truncate, including the entire size of blocks that have had at least one byte dirtied. As above, it may be non-zero even if err != nil.

func (*FileData) UndupChildrenInCopy 

func (fd *FileData) UndupChildrenInCopy(ctx context.Context,
	bcache BlockCache, rp ReadyProvider, bps BlockPutState,
	topBlock *FileBlock) ([]BlockInfo, error)

UndupChildrenInCopy takes a top block that's been copied via deepCopy(), and un-deduplicates all leaf children of the block. It adds all child blocks to the provided `bps`, including both the ones that were deduplicated and the ones that weren't. It returns the BlockInfos for all children.

func (*FileData) Write 

func (fd *FileData) Write(ctx context.Context, data []byte, off Int64Offset,
	topBlock *FileBlock, oldDe DirEntry, df *DirtyFile) (
	newDe DirEntry, dirtyPtrs []BlockPointer, unrefs []BlockInfo,
	newlyDirtiedChildBytes int64, bytesExtended int64, err error)

Write sets the given data and the given offset within the file, making new blocks and new levels of indirection as needed. Return params:

  • newDe: a new directory entry with the EncodedSize cleared if the file was extended.
  • dirtyPtrs: a slice of the BlockPointers that have been dirtied during the write. This includes any interior indirect blocks that may not have been changed yet, but which will need to change as part of the sync process because of leaf node changes below it.
  • unrefs: a slice of BlockInfos that must be unreferenced as part of an eventual sync of this write. May be non-nil even if err != nil.
  • newlyDirtiedChildBytes is the total amount of block data dirtied by this write, including the entire size of blocks that have had at least one byte dirtied. As above, it may be non-zero even if err != nil.
  • bytesExtended is the number of bytes the length of the file has been extended as part of this write.

type FolderBranch 

type FolderBranch struct {
	Tlf    tlf.ID
	Branch BranchName // master branch, by default
}

FolderBranch represents a unique pair of top-level folder and a branch of that folder.

func (FolderBranch) String 

func (fb FolderBranch) String() string

type IndirectDirPtr 

type IndirectDirPtr struct {
	// TODO: Make sure that the block is not dirty when the EncodedSize
	// field is non-zero.
	BlockInfo
	Off StringOffset `codec:"o"`

	codec.UnknownFieldSetHandler
}

IndirectDirPtr pairs an indirect dir block with the start of that block's range of directory entries (inclusive)

type IndirectFilePtr 

type IndirectFilePtr struct {
	// When the EncodedSize field is non-zero, the block must not
	// be dirty.
	BlockInfo
	Off Int64Offset `codec:"o"`
	// Marker for files with holes.  This is here for historical
	// reasons; a `FileBlock` should be treated as having a `HasHoles`
	// flag set to true if any of its IPtrs have `Holes` set to true.
	Holes bool `codec:"h,omitempty"`

	codec.UnknownFieldSetHandler
}

IndirectFilePtr pairs an indirect file block with the start of that block's range of bytes (inclusive)

If `Holes` is true, then this pointer is part of a list of pointers that has non-continuous offsets; that is, the offset of ptr `i` plus the length of the corresponding block contents is less than the offset of ptr `i`+1.

type Int64Offset 

type Int64Offset int64

Int64Offset represents the offset of a block within a file.

func (Int64Offset) Equals 

func (i Int64Offset) Equals(other Offset) bool

Equals implements the Offset interface for Int64Offset.

func (Int64Offset) Less 

func (i Int64Offset) Less(other Offset) bool

Less implements the Offset interface for Int64Offset.

func (Int64Offset) String 

func (i Int64Offset) String() string

type IsDirtyProvider 

type IsDirtyProvider interface {
	// IsDirty states whether or not the block associated with the
	// given block pointer and branch name is dirty in this cache.
	IsDirty(tlfID tlf.ID, ptr BlockPointer, branch BranchName) bool
}

IsDirtyProvider defines a method for checking whether a given pointer is dirty.

type NameExistsError 

type NameExistsError struct {
	Name string
}

NameExistsError indicates that the user tried to create an entry for a name that already existed in a subdirectory.

func (NameExistsError) Error 

func (e NameExistsError) Error() string

Error implements the error interface for NameExistsError

type NoSuchBlockError 

type NoSuchBlockError struct {
	ID kbfsblock.ID
}

NoSuchBlockError indicates that a block for the associated ID doesn't exist.

func (NoSuchBlockError) Error 

func (e NoSuchBlockError) Error() string

Error implements the error interface for NoSuchBlockError

type NodeObfuscator 

type NodeObfuscator struct {
	// contains filtered or unexported fields
}

NodeObfuscator takes a secret, and uses it to create obfuscate strings based on BIP-0039 dictionary words. It remembers previous obfuscations, and if there happens to be a collision on the obfuscated text for a new plaintext string, it appends a numeric suffix to the new obfuscation.

func NewNodeObfuscator 

func NewNodeObfuscator(secret NodeObfuscatorSecret) *NodeObfuscator

NewNodeObfuscator creates a new `NodeObfuscator` instance.

func (*NodeObfuscator) Obfuscate 

func (no *NodeObfuscator) Obfuscate(plaintext string) string

Obfuscate implements the `Obfuscator` interface for NodeObfuscator.

type NodeObfuscatorSecret 

type NodeObfuscatorSecret []byte

NodeObfuscatorSecret is a byte slice wrapper for a secret that can be passed to `NodeObfuscator`. It overrides `String` so there's no chance of the secret being accidentally logged.

func (NodeObfuscatorSecret) String 

func (nos NodeObfuscatorSecret) String() string

String implements the `fmt.Stringer` interface for NodeObfuscatorSecret.

type NotDirectFileBlockError 

type NotDirectFileBlockError struct {
}

NotDirectFileBlockError indicates that a direct file block was expected, but something else (e.g., an indirect file block) was given instead.

func (NotDirectFileBlockError) Error 

func (e NotDirectFileBlockError) Error() string

type Obfuscator 

type Obfuscator interface {
	// Obfuscate returns an obfuscated version of `plaintext`.
	Obfuscate(plaintext string) string
}

Obfuscator can transform a given plaintext string into a securely-obfuscated, but still human-readable, string.

type Offset 

type Offset interface {
	Equals(other Offset) bool
	Less(other Offset) bool
}

Offset is a generic representation of an offset to an indirect pointer within an indirect Block.

type ParentBlockAndChildIndex 

type ParentBlockAndChildIndex struct {
	// contains filtered or unexported fields
}

ParentBlockAndChildIndex is a node on a path down the tree to a particular leaf node. `pblock` is an indirect block corresponding to one of that leaf node's parents, and `childIndex` is an index into `pblock.IPtrs` to the next node along the path.

type Path 

type Path struct {
	FolderBranch
	Path            []PathNode
	ChildObfuscator Obfuscator
}

Path represents the full KBFS path to a particular location, so that a flush can traverse backwards and fix up ids along the way.

func (Path) CanonicalPathPlaintext 

func (p Path) CanonicalPathPlaintext() string

CanonicalPathPlaintext returns an un-obfuscated canonical representation of the full path, always prefaced by /keybase. This may require conversion to a platform specific path, for example, by replacing /keybase with the appropriate drive letter on Windows. It also, might need conversion if on a different run mode, for example, /keybase.staging on Unix type platforms.

func (Path) CanonicalPathString 

func (p Path) CanonicalPathString() string

CanonicalPathString returns an obfuscated canonical representation of the full path, always prefaced by /keybase. This may require conversion to a platform specific path, for example, by replacing /keybase with the appropriate drive letter on Windows. It also, might need conversion if on a different run mode, for example, /keybase.staging on Unix type platforms.

func (Path) ChildPath 

func (p Path) ChildPath(
	name PathPartString, ptr BlockPointer, childObfuscator Obfuscator) Path

ChildPath returns a new Path with the addition of a new entry with the given name and BlockPointer.

func (Path) ChildPathNoPtr 

func (p Path) ChildPathNoPtr(
	name PathPartString, childObfuscator Obfuscator) Path

ChildPathNoPtr returns a new Path with the addition of a new entry with the given name. That final PathNode will have no BlockPointer.

func (Path) DebugString 

func (p Path) DebugString() string

DebugString returns a string representation of the path with all branch and pointer information.

func (Path) HasValidParent 

func (p Path) HasValidParent() bool

HasValidParent returns true if this path is valid and `ParentPath()` is a valid path.

func (Path) IsValid 

func (p Path) IsValid() bool

IsValid returns true if the path has at least one node (for the root).

func (Path) IsValidForNotification 

func (p Path) IsValidForNotification() bool

IsValidForNotification returns true if the path has at least one node (for the root), and the first element of the path is non-empty and does not start with "<", which indicates an unnotifiable path.

func (Path) Obfuscator 

func (p Path) Obfuscator() Obfuscator

Obfuscator returns the obfuscator of the tail node in this path.

func (Path) ParentPath 

func (p Path) ParentPath() *Path

ParentPath returns a new Path representing the parent subdirectory of this Path. Must be called with a valid path. Should not be called with a path of only a single node, as that would produce an invalid path.

func (Path) Plaintext 

func (p Path) Plaintext() string

Plaintext returns an unobfuscated string for this path.

func (Path) PlaintextSansTlf 

func (p Path) PlaintextSansTlf() (string, bool)

PlaintextSansTlf returns an unobfuscated string for this path, rooted at the TLF.

Examples: /keybase/private/alice -> "/", true 

/keybase/private/alice/folder -> "/folder", true
/keybase/private -> "", false

func (Path) String 

func (p Path) String() string

String implements the fmt.Stringer interface for Path.

func (Path) TailName 

func (p Path) TailName() PathPartString

TailName returns the name of the final node in the Path. Must be called with a valid path.

func (Path) TailPointer 

func (p Path) TailPointer() BlockPointer

TailPointer returns the BlockPointer of the final node in the Path. Must be called with a valid path.

func (Path) TailRef 

func (p Path) TailRef() BlockRef

TailRef returns the BlockRef of the final node in the Path. Must be called with a valid path.

type PathNode 

type PathNode struct {
	BlockPointer
	Name PathPartString
}

PathNode is a single node along an KBFS path, pointing to the top block for that node of the path.

func (PathNode) DebugString 

func (n PathNode) DebugString() string

DebugString returns a string representation of the node with all pointer information.

func (PathNode) IsValid 

func (n PathNode) IsValid() bool

IsValid returns true if this node contains a valid block pointer.

type PathPartString 

type PathPartString struct {
	// contains filtered or unexported fields
}

PathPartString returns an obfuscated version of part of a path, preserving the suffixes if they're small enough or if it's a conflicted copy of a file. Two `PathPartString`s for the same plaintext data, created using the same `Obfuscator`, should pass equality checks.

func NewPathPartString 

func NewPathPartString(
	plaintext string, obfuscator Obfuscator) PathPartString

NewPathPartString creates a new `PathPartString` instance, given a plaintext string representing one part of a path, and a `Obfuscator`.

func (PathPartString) MarshalJSON 

func (pps PathPartString) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface for PathPartString.

func (PathPartString) MarshalText 

func (pps PathPartString) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextMarshaler interface for PathPartString.

func (PathPartString) Obfuscator 

func (pps PathPartString) Obfuscator() Obfuscator

Obfuscator returns this string's obfuscator.

func (PathPartString) Plaintext 

func (pps PathPartString) Plaintext() string

Plaintext returns the plaintext underlying this string part.

func (PathPartString) String 

func (pps PathPartString) String() string

type PrevRevisionAndCount 

type PrevRevisionAndCount struct {
	Revision kbfsmd.Revision `codec:"r"`
	Count    uint8           `codec:"c"`

	codec.UnknownFieldSetHandler
}

PrevRevisionAndCount track the MD version of a previous revision of a dir entry, and how many revisions ago that was from the current revision.

type PrevRevisions 

type PrevRevisions []PrevRevisionAndCount

PrevRevisions tracks several previous versions of a file in order of descending revision number, starting with the most recent.

func (PrevRevisions) AddRevision 

func (pr PrevRevisions) AddRevision(
	r, minRev kbfsmd.Revision) (ret PrevRevisions)

AddRevision returns a copy of `pr` with a new immediately-previous revision added, with the existing entries moved or overwritten to accomodate the new entry, and with increased counts. Any existing revisions smaller than or equal to minRev will be removed.

type ReadyBlockData 

type ReadyBlockData struct {
	// These fields should not be used outside of putBlockToServer.
	Buf        []byte
	ServerHalf kbfscrypto.BlockCryptKeyServerHalf
}

ReadyBlockData is a block that has been encoded (and encrypted).

func (ReadyBlockData) GetEncodedSize 

func (r ReadyBlockData) GetEncodedSize() int

GetEncodedSize returns the size of the encoded (and encrypted) block data.

type ReadyProvider 

type ReadyProvider interface {
	// Ready turns the given block (which belongs to the TLF with
	// the given key metadata) into encoded (and encrypted) data,
	// and calculates its ID and size, so that we can do a bunch
	// of block puts in parallel for every write. Ready() must
	// guarantee that plainSize <= readyBlockData.QuotaSize().
	Ready(ctx context.Context, kmd libkey.KeyMetadata, block Block) (
		id kbfsblock.ID, plainSize int, readyBlockData ReadyBlockData,
		err error)
}

ReadyProvider defines a method for readying a block.

type ShutdownHappenedError 

type ShutdownHappenedError struct {
}

ShutdownHappenedError indicates that shutdown has happened.

func (ShutdownHappenedError) Error 

func (e ShutdownHappenedError) Error() string

Error implements the error interface for ShutdownHappenedError.

type StringOffset 

type StringOffset string

StringOffset represents the offset of a block within a directory.

func (*StringOffset) Equals 

func (s *StringOffset) Equals(other Offset) bool

Equals implements the Offset interface for StringOffset.

func (*StringOffset) Less 

func (s *StringOffset) Less(other Offset) bool

Less implements the Offset interface for StringOffset.

func (*StringOffset) String 

func (s *StringOffset) String() string

type Ver 

type Ver int

Ver is the type of a version for marshalled KBFS data structures.

1) Ver is a per-block attribute, not per-file. This means that, in theory, an indirect block with DataVer n may point to blocks with Vers less than, equal to, or greater than n. However, for now, it's guaranteed that an indirect block will never point to blocks with greater versions than itself. (See #3 for details.)

2) Ver is an external attribute of a block, meaning that it's not stored as part of the block, but computed by the creator (or anyone with the latest kbfs client), and stored only in pointers to the block.

2.5) A file (or, in the future a dir) can in theory have any arbitrary tree structure of blocks. However, we only write files such that all paths to leaves have the same depth.

Currently, in addition to 2.5, we have the following constraints on block tree structures: a) Direct blocks are always v1. b) Indirect blocks of depth 2 (meaning one indirect block pointing to all direct blocks) can be v1 (if it has no holes) or v2 (if it has holes). However, all its indirect pointers will have Ver 1, by a). c) Indirect blocks of depth 3 must be v3 and must have at least one indirect pointer with an indirect DirectType [although if it holds for one, it should hold for all], although its indirect pointers may have any combination of Ver 1 or 2, by b). d) Indirect blocks of dept k > 3 must be v3 and must have at least one indirect pointer with an indirect DirectType [although if it holds for one, it should hold for all], and all of its indirect pointers must have Ver 3, by c). 

const (
	// FirstValidVer is the first value that is considered a
	// valid data version. Note that the nil value is not
	// considered valid.
	FirstValidVer Ver = 1
	// ChildHolesVer is the data version for any indirect block
	// containing a set of pointers with holes.
	ChildHolesVer Ver = 2
	// AtLeastTwoLevelsOfChildrenVer is the data version for
	// blocks that have multiple levels of indirection below them
	// (i.e., indirect blocks that point to other indirect blocks).
	AtLeastTwoLevelsOfChildrenVer Ver = 3
	// IndirectDirsVer is the data version for a directory block
	// that contains indirect pointers.
	IndirectDirsVer Ver = 4
)

func DefaultNewBlockDataVersion 

func DefaultNewBlockDataVersion(holes bool) Ver

DefaultNewBlockDataVersion returns the default data version for new blocks.

type Versioner 

type Versioner interface {
	// DataVersion returns the data version for this block
	DataVersion() Ver
}

Versioner defines a method for getting the version of some piece of data.

type WallClock 

type WallClock struct {
}

WallClock is a wrapper around the built-in clock.

func (WallClock) Now 

func (wc WallClock) Now() time.Time

Now returns the current wall clock time.

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