fuse

package
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 Go to latest Published: Dec 10, 2020 License: BSD-3-Clause Imports: 16 Imported by: 0

Documentation

Overview

Package fuse enables writing FUSE file systems on FreeBSD, Linux, and OS X.

On OS X, it requires OSXFUSE (http://osxfuse.github.com/).

There are two approaches to writing a FUSE file system. The first is to speak the low-level message protocol, reading from a Conn using ReadRequest and writing using the various Respond methods. This approach is closest to the actual interaction with the kernel and can be the simplest one in contexts such as protocol translators.

Servers of synthesized file systems tend to share common bookkeeping abstracted away by the second approach, which is to call the Conn's Serve method to serve the FUSE protocol using an implementation of the service methods in the interfaces FS (file system), Node (file or directory), and Handle (opened file or directory). There are a daunting number of such methods that can be written, but few are required. The specific methods are described in the documentation for those interfaces.

The hellofs subdirectory contains a simple illustration of the ServeFS approach.

Service Methods

The required and optional methods for the FS, Node, and Handle interfaces have the general form 

Op(req *OpRequest, resp *OpResponse, intr Intr) Error

where Op is the name of a FUSE operation. Op reads request parameters from req and writes results to resp. An operation whose only result is the error result omits the resp parameter. Multiple goroutines may call service methods simultaneously; the methods being called are responsible for appropriate synchronization.

Interrupted Operations

In some file systems, some operations may take an undetermined amount of time. For example, a Read waiting for a network message or a matching Write might wait indefinitely. If the request is cancelled and no longer needed, the package will close intr, a chan struct{}. Blocking operations should select on a receive from intr and attempt to abort the operation early if the receive succeeds (meaning the channel is closed). To indicate that the operation failed because it was aborted, return fuse.EINTR.

If an operation does not block for an indefinite amount of time, the intr parameter can be ignored.

Authentication

All requests types embed a Header, meaning that the method can inspect req.Pid, req.Uid, and req.Gid as necessary to implement permission checking. Alternately, XXX.

Mount Options

XXX

Index

Constants

View Source 
const (
	// ENOSYS indicates that the call is not supported.
	ENOSYS = Errno(syscall.ENOSYS)

	// ESTALE is used by Serve to respond to violations of the FUSE protocol.
	ESTALE = Errno(syscall.ESTALE)

	ENOENT = Errno(syscall.ENOENT)
	EIO    = Errno(syscall.EIO)
	EPERM  = Errno(syscall.EPERM)
)
View Source 
const Version = "7.8"

Version is the FUSE version implemented by the package.

Variables

View Source 
var Debugf = nop

Functions

func AppendDirent 

func AppendDirent(data []byte, dir Dirent) []byte

AppendDirent appends the encoded form of a directory entry to data and returns the resulting slice.

func HandleRead 

func HandleRead(req *ReadRequest, resp *ReadResponse, data []byte)

HandleRead handles a read request assuming that data is the entire file content. It adjusts the amount returned in resp according to req.Offset and req.Size.

Types

type AccessRequest 

type AccessRequest struct {
	Header
	Mask uint32
}

An AccessRequest asks whether the file can be accessed for the purpose specified by the mask.

func (*AccessRequest) Respond 

func (r *AccessRequest) Respond()

Respond replies to the request indicating that access is allowed. To deny access, use RespondError.

func (*AccessRequest) String 

func (r *AccessRequest) String() string

type Attr 

type Attr struct {
	Inode  uint64      // inode number
	Size   uint64      // size in bytes
	Blocks uint64      // size in blocks
	Atime  time.Time   // time of last access
	Mtime  time.Time   // time of last modification
	Ctime  time.Time   // time of last inode change
	Crtime time.Time   // time of creation (OS X only)
	Mode   os.FileMode // file mode
	Nlink  uint32      // number of links
	Uid    uint32      // owner uid
	Gid    uint32      // group gid
	Rdev   uint32      // device numbers
	Flags  uint32      // chflags(2) flags (OS X only)
}

An Attr is the metadata for a single file or directory.

type Conn 

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

A Conn represents a connection to a mounted FUSE file system.

func Mount 

func Mount(dir string) (*Conn, error)

Mount mounts a new FUSE connection on the named directory and returns a connection for reading and writing FUSE messages.

func (*Conn) ReadRequest 

func (c *Conn) ReadRequest() (Request, error)

func (*Conn) Serve 

func (c *Conn) Serve(fs FS) error

Serve serves the FUSE connection by making calls to the methods of fs and the Nodes and Handles it makes available. It returns only when the connection has been closed or an unexpected error occurs.

type CreateRequest 

type CreateRequest struct {
	Header
	Name  string
	Flags uint32
	Mode  os.FileMode
}

A CreateRequest asks to create and open a file (not a directory).

func (*CreateRequest) Respond 

func (r *CreateRequest) Respond(resp *CreateResponse)

Respond replies to the request with the given response.

func (*CreateRequest) String 

func (r *CreateRequest) String() string

type CreateResponse 

type CreateResponse struct {
	LookupResponse
	OpenResponse
}

A CreateResponse is the response to a CreateRequest. It describes the created node and opened handle.

func (*CreateResponse) String 

func (r *CreateResponse) String() string

type DestroyRequest 

type DestroyRequest struct {
	Header
}

A DestroyRequest is sent by the kernel when unmounting the file system. No more requests will be received after this one, but it should still be responded to.

func (*DestroyRequest) Respond 

func (r *DestroyRequest) Respond()

Respond replies to the request.

func (*DestroyRequest) String 

func (r *DestroyRequest) String() string

type Dirent 

type Dirent struct {
	Inode uint64 // inode this entry names
	Type  uint32 // ?
	Name  string // name of entry
}

A Dirent represents a single directory entry.

type Errno 

type Errno syscall.Errno

Errno implements Error using a syscall.Errno.

func (Errno) String 

func (e Errno) String() string

type Error 

type Error interface {
	// contains filtered or unexported methods
}

An Error is a FUSE error.

type FS 

type FS interface {
	Root() (Node, Error)
}

An FS is the interface required of a file system. 

Root() (Node, Error)

Root is called to obtain the Node for the file system root.

Optional Methods

An FS implementation may implement additional methods to handle the corresponding FUSE requests: 

Init(req *InitRequest, resp *InitResponse) Error

Init is called to initialize the FUSE connection. It can inspect the request and adjust the response as desired. The default response sets MaxReadahead to 0 and MaxWrite to 4096. Init must return promptly. 

Statfs(resp *StatfsResponse, intr Intr) Error

Statfs is called to obtain file system metadata. It should write that data to resp. 

Rename(req *RenameRequest, intr Intr) Error

XXXX this is not implemented like this. Instead, Rename is a method on the source dierctory node, and takes a newDir Node parameter. Fix it like this? Rename is called to rename the file req.OldName in the directory req.OldDir to become the file req.NewName in the directory req.NewDir.

type FlushRequest 

type FlushRequest struct {
	Header
	Handle    HandleID
	Flags     uint32
	LockOwner uint64
}

A FlushRequest asks for the current state of an open file to be flushed to storage, as when a file descriptor is being closed. A single opened Handle may receive multiple FlushRequests over its lifetime.

func (*FlushRequest) Respond 

func (r *FlushRequest) Respond()

Respond replies to the request, indicating that the flush succeeded.

func (*FlushRequest) String 

func (r *FlushRequest) String() string

type ForgetRequest 

type ForgetRequest struct {
	Header
	N uint64
}

A ForgetRequest is sent by the kernel when forgetting about r.Node as returned by r.N lookup requests.

func (*ForgetRequest) Respond 

func (r *ForgetRequest) Respond()

Respond replies to the request, indicating that the forgetfulness has been recorded.

func (*ForgetRequest) String 

func (r *ForgetRequest) String() string

type FsyncRequest 

type FsyncRequest struct {
	Header
	Handle HandleID
	Flags  uint32
}

func (*FsyncRequest) Respond 

func (r *FsyncRequest) Respond()

func (*FsyncRequest) String 

func (r *FsyncRequest) String() string

type GetattrRequest 

type GetattrRequest struct {
	Header
}

A GetattrRequest asks for the metadata for the file denoted by r.Node.

func (*GetattrRequest) Respond 

func (r *GetattrRequest) Respond(resp *GetattrResponse)

Respond replies to the request with the given response.

func (*GetattrRequest) String 

func (r *GetattrRequest) String() string

type GetattrResponse 

type GetattrResponse struct {
	AttrValid time.Duration // how long Attr can be cached
	Attr      Attr          // file attributes
}

A GetattrResponse is the response to a GetattrRequest.

func (*GetattrResponse) String 

func (r *GetattrResponse) String() string

type GetxattrRequest 

type GetxattrRequest struct {
	Header
	Size     uint32 // maximum size to return
	Position uint32 // offset within extended attributes
}

A GetxattrRequest asks for the extended attributes associated with r.Node.

func (*GetxattrRequest) Respond 

func (r *GetxattrRequest) Respond(resp *GetxattrResponse)

Respond replies to the request with the given response.

func (*GetxattrRequest) String 

func (r *GetxattrRequest) String() string

type GetxattrResponse 

type GetxattrResponse struct {
	Xattr []byte
}

A GetxattrResponse is the response to a GetxattrRequest.

func (*GetxattrResponse) String 

func (r *GetxattrResponse) String() string

type Handle 

type Handle interface {
}

A Handle is the interface required of an opened file or directory. See the documentation for type FS for general information pertaining to all methods. 

Flush

Flush is called each time the file or directory is closed. Because there can be multiple file descriptors referring to a single opened file, Flush can be called multiple times.

Optional Methods

A Handle implementation may implement additional methods to handle the corresponding FUSE requests. The most common to implement are Read, ReadDir, and Write. 

Fsync

Getlk

Read

Readdir

Release

Setlk

Setlkw

Write

func DataHandle 

func DataHandle(data []byte) Handle

DataHandle returns a read-only Handle that satisfies reads using the given data.

type HandleID 

type HandleID uint64

A HandleID is a number identifying an open directory or file. It only needs to be unique while the directory or file is open. 

type Header struct {
	Conn *Conn     // connection this request was received on
	ID   RequestID // unique ID for request
	Node NodeID    // file or directory the request is about
	Uid  uint32    // user ID of process making request
	Gid  uint32    // group ID of process making request
	Pid  uint32    // process ID of process making request
}

A Header describes the basic information sent in every request.

func (*Header) Hdr 

func (h *Header) Hdr() *Header

func (*Header) RespondError 

func (h *Header) RespondError(err Error)

func (*Header) String 

func (h *Header) String() string

type InitFlags 

type InitFlags uint32

The InitFlags are used in the Init exchange. 

const (
	InitAsyncRead  InitFlags = 1 << 0
	InitPosixLocks InitFlags = 1 << 1

	InitCaseSensitive InitFlags = 1 << 29 // OS X only
	InitVolRename     InitFlags = 1 << 30 // OS X only
	InitXtimes        InitFlags = 1 << 31 // OS X only
)

func (InitFlags) String 

func (fl InitFlags) String() string

type InitRequest 

type InitRequest struct {
	Header
	Major        uint32
	Minor        uint32
	MaxReadahead uint32
	Flags        InitFlags
}

An InitRequest is the first request sent on a FUSE file system.

func (*InitRequest) Respond 

func (r *InitRequest) Respond(resp *InitResponse)

Respond replies to the request with the given response.

func (*InitRequest) String 

func (r *InitRequest) String() string

type InitResponse 

type InitResponse struct {
	MaxReadahead uint32
	Flags        InitFlags
	MaxWrite     uint32
}

An InitResponse is the response to an InitRequest.

func (*InitResponse) String 

func (r *InitResponse) String() string

type InterruptRequest 

type InterruptRequest struct {
	Header
	Unique uint64
}

An InterruptRequest asks for the request with the given unique ID to be canceled.

type Intr 

type Intr chan struct{}

An Intr is a channel that signals that a request has been interrupted. Being able to receive from the channel means the request has been interrupted.

func (Intr) String 

func (Intr) String() string

type LinkRequest 

type LinkRequest struct {
	Header
	OldNode NodeID
	NewName string
}

A LinkRequest is a request to create a hard link.

func (*LinkRequest) Respond 

func (r *LinkRequest) Respond(resp *LookupResponse)

type ListxattrRequest 

type ListxattrRequest struct {
	Header
	Size     uint32 // maximum size to return
	Position uint32 // offset within attribute list
}

A ListxattrRequest asks to list the extended attributes associated with r.Node.

func (*ListxattrRequest) Respond 

func (r *ListxattrRequest) Respond(resp *ListxattrResponse)

Respond replies to the request with the given response.

func (*ListxattrRequest) String 

func (r *ListxattrRequest) String() string

type ListxattrResponse 

type ListxattrResponse struct {
	Xattr []byte
}

A ListxattrResponse is the response to a ListxattrRequest.

func (*ListxattrResponse) String 

func (r *ListxattrResponse) String() string

type LookupRequest 

type LookupRequest struct {
	Header
	Name string
}

A LookupRequest asks to look up the given name in the directory named by r.Node.

func (*LookupRequest) Respond 

func (r *LookupRequest) Respond(resp *LookupResponse)

Respond replies to the request with the given response.

func (*LookupRequest) String 

func (r *LookupRequest) String() string

type LookupResponse 

type LookupResponse struct {
	Node       NodeID
	Generation uint64
	EntryValid time.Duration
	AttrValid  time.Duration
	Attr       Attr
}

A LookupResponse is the response to a LookupRequest.

func (*LookupResponse) String 

func (r *LookupResponse) String() string

type MkdirRequest 

type MkdirRequest struct {
	Header
	Name string
	Mode os.FileMode
}

A MkdirRequest asks to create (but not open) a directory.

func (*MkdirRequest) Respond 

func (r *MkdirRequest) Respond(resp *MkdirResponse)

Respond replies to the request with the given response.

func (*MkdirRequest) String 

func (r *MkdirRequest) String() string

type MkdirResponse 

type MkdirResponse struct {
	LookupResponse
}

A MkdirResponse is the response to a MkdirRequest.

func (*MkdirResponse) String 

func (r *MkdirResponse) String() string

type MknodRequest 

type MknodRequest struct {
	Header
	Name string
	Mode os.FileMode
	Rdev uint32
}

func (*MknodRequest) Respond 

func (r *MknodRequest) Respond(resp *LookupResponse)

func (*MknodRequest) String 

func (r *MknodRequest) String() string

type Node 

type Node interface {
	Attr() Attr
}

A Node is the interface required of a file or directory. See the documentation for type FS for general information pertaining to all methods. 

Getattr(resp *GetattrResponse, intr Intr) fuse.Error

Getattr obtains the standard metadata for the receiver. It should store that metadata in resp. 

Open(xxx, intr Intr) (Handle, fuse.Error)

Open opens the receiver. XXX note about access. XXX OpenFlags. XXX note that the Node may be a file or directory.

Optional Methods

An Node implementation may implement additional methods to handle the corresponding FUSE requests.

These optional requests can be called for both file and directory nodes: 

Access

Access checks whether the calling context has permission for the given operations on the receiver. If so, Access should return nil. If not, Access should return EPERM. Note that this call affects the result of the access(2) system call but not the open(2) system call. If Access is not implemented, the Node behaves as if it always returns nil (permission granted), relying on checks in Open instead. 

Getxattr

Getxattr obtains an extended attribute for the receiver. XXX 

Listxattr

Listxattr lists the extended attributes recorded for the receiver. 

Removexattr

Removexattr removes an extended attribute from the receiver. 

Setattr

Setattr sets the standard metadata for the receiver. 

Setxattr

Setxattr sets an extended attribute for the receiver.

Optional Directory Methods

These optional requests will be called only for directory nodes: 

Create(xxx)

Create creates 

Link(xxx)

Link XXX 

Lookup(name string, intr Intr) (Node, Error)

Lookup looks up a specific entry in the receiver, which must be a directory. Lookup should return a Node corresponding to the entry. If the name does not exist in the directory, Lookup should return nil, err.

Lookup need not to handle the names "." and "..". 

Mkdir

Mkdir creates XXX 

Mknod XXX

XXX 

Remove

Remove removes the entry with the given name from the receiver, which must be a directory. The entry to be removed may correspond to a file (unlink) or to a directory (rmdir). 

Symlink

Symlink creates a new symbolic link in the receiver, which must be a directory. The entry

This optional request will be called only for symbolic link nodes: 

Readlink

Readlink reads a symbolic link.

type NodeID 

type NodeID uint64

A NodeID is a number identifying a directory or file. It must be unique among IDs returned in LookupResponses that have not yet been forgotten by ForgetRequests. 

const RootID NodeID = rootID

The RootID identifies the root directory of a FUSE file system.

type OpenFlags 

type OpenFlags uint32

The OpenFlags are returned in the OpenResponse. 

const (
	OpenDirectIO    OpenFlags = 1 << 0 // bypass page cache for this open file
	OpenKeepCache   OpenFlags = 1 << 1 // don't invalidate the data cache on open
	OpenNonSeekable OpenFlags = 1 << 2 // (Linux?)

	OpenPurgeAttr OpenFlags = 1 << 30 // OS X
	OpenPurgeUBC  OpenFlags = 1 << 31 // OS X
)

func (OpenFlags) String 

func (fl OpenFlags) String() string

type OpenRequest 

type OpenRequest struct {
	Header
	Dir   bool // is this Opendir?
	Flags uint32
	Mode  os.FileMode
}

An OpenRequest asks to open a file or directory

func (*OpenRequest) Respond 

func (r *OpenRequest) Respond(resp *OpenResponse)

Respond replies to the request with the given response.

func (*OpenRequest) String 

func (r *OpenRequest) String() string

type OpenResponse 

type OpenResponse struct {
	Handle HandleID
	Flags  OpenFlags
}

A OpenResponse is the response to a OpenRequest.

func (*OpenResponse) String 

func (r *OpenResponse) String() string

type ReadRequest 

type ReadRequest struct {
	Header
	Dir    bool // is this Readdir?
	Handle HandleID
	Offset int64
	Size   int
}

A ReadRequest asks to read from an open file.

func (*ReadRequest) Respond 

func (r *ReadRequest) Respond(resp *ReadResponse)

Respond replies to the request with the given response.

func (*ReadRequest) String 

func (r *ReadRequest) String() string

type ReadResponse 

type ReadResponse struct {
	Data []byte
}

A ReadResponse is the response to a ReadRequest.

func (*ReadResponse) String 

func (r *ReadResponse) String() string

type ReadlinkRequest 

type ReadlinkRequest struct {
	Header
}

A ReadlinkRequest is a request to read a symlink's target.

func (*ReadlinkRequest) Respond 

func (r *ReadlinkRequest) Respond(target string)

func (*ReadlinkRequest) String 

func (r *ReadlinkRequest) String() string

type ReleaseFlags 

type ReleaseFlags uint32

The ReleaseFlags are used in the Release exchange. 

const (
	ReleaseFlush ReleaseFlags = 1 << 0
)

func (ReleaseFlags) String 

func (fl ReleaseFlags) String() string

type ReleaseRequest 

type ReleaseRequest struct {
	Header
	Dir          bool // is this Releasedir?
	Handle       HandleID
	Flags        uint32 // flags from OpenRequest
	ReleaseFlags ReleaseFlags
	LockOwner    uint32
}

A ReleaseRequest asks to release (close) an open file handle.

func (*ReleaseRequest) Respond 

func (r *ReleaseRequest) Respond()

Respond replies to the request, indicating that the handle has been released.

func (*ReleaseRequest) String 

func (r *ReleaseRequest) String() string

type RemoveRequest 

type RemoveRequest struct {
	Header
	Name string // name of extended attribute
	Dir  bool   // is this rmdir?
}

A RemoveRequest asks to remove a file or directory.

func (*RemoveRequest) Respond 

func (r *RemoveRequest) Respond()

Respond replies to the request, indicating that the file was removed.

func (*RemoveRequest) String 

func (r *RemoveRequest) String() string

type RemovexattrRequest 

type RemovexattrRequest struct {
	Header
	Name string // name of extended attribute
}

A RemovexattrRequest asks to remove an extended attribute associated with r.Node.

func (*RemovexattrRequest) Respond 

func (r *RemovexattrRequest) Respond()

Respond replies to the request, indicating that the attribute was removed.

func (*RemovexattrRequest) String 

func (r *RemovexattrRequest) String() string

type RenameRequest 

type RenameRequest struct {
	Header
	NewDir           NodeID
	OldName, NewName string
}

A RenameRequest is a request to rename a file.

func (*RenameRequest) Respond 

func (r *RenameRequest) Respond()

func (*RenameRequest) String 

func (r *RenameRequest) String() string

type Request 

type Request interface {
	// Hdr returns the Header associated with this request.
	Hdr() *Header

	// RespondError responds to the request with the given error.
	RespondError(Error)

	String() string
	// contains filtered or unexported methods
}

A Request represents a single FUSE request received from the kernel. Use a type switch to determine the specific kind. A request of unrecognized type will have concrete type *Header.

type RequestID 

type RequestID uint64

A RequestID identifies an active FUSE request.

type SetattrRequest 

type SetattrRequest struct {
	Header
	Valid  SetattrValid
	Handle HandleID
	Size   uint64
	Atime  time.Time
	Mtime  time.Time
	Mode   os.FileMode
	Uid    uint32
	Gid    uint32

	// OS X only
	Bkuptime time.Time
	Chgtime  time.Time
	Crtime   time.Time
	Flags    uint32 // see chflags(2)
}

A SetattrRequest asks to change one or more attributes associated with a file, as indicated by Valid.

func (*SetattrRequest) Respond 

func (r *SetattrRequest) Respond(resp *SetattrResponse)

Respond replies to the request with the given response, giving the updated attributes.

func (*SetattrRequest) String 

func (r *SetattrRequest) String() string

type SetattrResponse 

type SetattrResponse struct {
	AttrValid time.Duration // how long Attr can be cached
	Attr      Attr          // file attributes
}

A SetattrResponse is the response to a SetattrRequest.

func (*SetattrResponse) String 

func (r *SetattrResponse) String() string

type SetattrValid 

type SetattrValid uint32

The SetattrValid are bit flags describing which fields in the SetattrRequest are included in the change. 

const (
	SetattrMode   SetattrValid = 1 << 0
	SetattrUid    SetattrValid = 1 << 1
	SetattrGid    SetattrValid = 1 << 2
	SetattrSize   SetattrValid = 1 << 3
	SetattrAtime  SetattrValid = 1 << 4
	SetattrMtime  SetattrValid = 1 << 5
	SetattrHandle SetattrValid = 1 << 6 // TODO: What does this mean?

	// Linux only(?)
	SetattrAtimeNow  SetattrValid = 1 << 7
	SetattrMtimeNow  SetattrValid = 1 << 8
	SetattrLockOwner SetattrValid = 1 << 9 // http://www.mail-archive.com/git-commits-head@vger.kernel.org/msg27852.html

	// OS X only
	SetattrCrtime   SetattrValid = 1 << 28
	SetattrChgtime  SetattrValid = 1 << 29
	SetattrBkuptime SetattrValid = 1 << 30
	SetattrFlags    SetattrValid = 1 << 31
)

func (SetattrValid) Atime 

func (fl SetattrValid) Atime() bool

func (SetattrValid) Bkuptime 

func (fl SetattrValid) Bkuptime() bool

func (SetattrValid) Chgtime 

func (fl SetattrValid) Chgtime() bool

func (SetattrValid) Crtime 

func (fl SetattrValid) Crtime() bool

func (SetattrValid) Flags 

func (fl SetattrValid) Flags() bool

func (SetattrValid) Gid 

func (fl SetattrValid) Gid() bool

func (SetattrValid) Handle 

func (fl SetattrValid) Handle() bool

func (SetattrValid) Mode 

func (fl SetattrValid) Mode() bool

func (SetattrValid) Mtime 

func (fl SetattrValid) Mtime() bool

func (SetattrValid) Size 

func (fl SetattrValid) Size() bool

func (SetattrValid) String 

func (fl SetattrValid) String() string

func (SetattrValid) Uid 

func (fl SetattrValid) Uid() bool

type SetxattrRequest 

type SetxattrRequest struct {
	Header
	Flags    uint32
	Position uint32 // OS X only
	Name     string
	Xattr    []byte
}

A SetxattrRequest asks to set an extended attribute associated with a file.

func (*SetxattrRequest) Respond 

func (r *SetxattrRequest) Respond()

Respond replies to the request, indicating that the extended attribute was set.

func (*SetxattrRequest) String 

func (r *SetxattrRequest) String() string

type StatfsRequest 

type StatfsRequest struct {
	Header
}

A StatfsRequest requests information about the mounted file system.

func (*StatfsRequest) Respond 

func (r *StatfsRequest) Respond(resp *StatfsResponse)

Respond replies to the request with the given response.

func (*StatfsRequest) String 

func (r *StatfsRequest) String() string

type StatfsResponse 

type StatfsResponse struct {
	Blocks  uint64 // Total data blocks in file system.
	Bfree   uint64 // Free blocks in file system.
	Bavail  uint64 // Free blocks in file system if you're not root.
	Files   uint64 // Total files in file system.
	Ffree   uint64 // Free files in file system.
	Bsize   uint32 // Block size
	Namelen uint32 // Maximum file name length?
	Frsize  uint32 // ?
}

A StatfsResponse is the response to a StatfsRequest.

func (*StatfsResponse) String 

func (r *StatfsResponse) String() string

type SymlinkRequest 

type SymlinkRequest struct {
	Header
	NewName, Target string
}

A SymlinkRequest is a request to create a symlink making NewName point to Target.

func (*SymlinkRequest) Respond 

func (r *SymlinkRequest) Respond(resp *SymlinkResponse)

Respond replies to the request, indicating that the symlink was created.

func (*SymlinkRequest) String 

func (r *SymlinkRequest) String() string

type SymlinkResponse 

type SymlinkResponse struct {
	LookupResponse
}

A SymlinkResponse is the response to a SymlinkRequest.

type Tree 

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

A Tree implements a basic directory tree for FUSE.

func (*Tree) Add 

func (t *Tree) Add(path string, node Node)

Add adds the path to the tree, resolving to the given node. If path or a prefix of path has already been added to the tree, Add panics.

func (*Tree) Attr 

func (t *Tree) Attr() Attr

func (*Tree) Lookup 

func (t *Tree) Lookup(name string, intr Intr) (Node, Error)

func (*Tree) ReadDir 

func (t *Tree) ReadDir(intr Intr) ([]Dirent, Error)

func (*Tree) Root 

func (t *Tree) Root() (Node, Error)

type WriteFlags 

type WriteFlags uint32

The WriteFlags are returned in the WriteResponse.

func (WriteFlags) String 

func (fl WriteFlags) String() string

type WriteRequest 

type WriteRequest struct {
	Header
	Handle HandleID
	Offset int64
	Data   []byte
	Flags  WriteFlags
}

A WriteRequest asks to write to an open file.

func (*WriteRequest) Respond 

func (r *WriteRequest) Respond(resp *WriteResponse)

Respond replies to the request with the given response.

func (*WriteRequest) String 

func (r *WriteRequest) String() string

type WriteResponse 

type WriteResponse struct {
	Size int
}

A WriteResponse replies to a write indicating how many bytes were written.

func (*WriteResponse) String 

func (r *WriteResponse) String() string

Notes

Bugs

  • The mount code for FreeBSD has not been written yet.

Source Files

View all Source files

Directories

Path Synopsis
Hellofs implements a simple "hello world" file system.
 Hellofs implements a simple "hello world" file system.

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