filesystem

package
v0.1.36 Latest Latest
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 Go to latest Published: Feb 11, 2026 License: AGPL-3.0, AGPL-3.0-or-later Imports: 32 Imported by: 0

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Index

Constants

View Source 
const (
	BackendFUSE = "fuse"
	BackendNFS  = "nfs"
)

Backend name constants.

Variables

View Source 
var (
	ErrNotFound     = fs.ErrNotExist
	ErrPermission   = fs.ErrPermission
	ErrExist        = fs.ErrExist
	ErrNotDir       = syscall.ENOTDIR
	ErrIsDir        = syscall.EISDIR
	ErrNotEmpty     = syscall.ENOTEMPTY
	ErrReadOnly     = syscall.EROFS
	ErrInvalid      = fs.ErrInvalid
	ErrIO           = syscall.EIO
	ErrNoSpace      = syscall.ENOSPC
	ErrNotSupported = syscall.ENOTSUP
	ErrNoAttr       = syscall.ENODATA // ENOATTR on macOS maps to ENODATA
)

Functions

func GenerateDirectoryID 

func GenerateDirectoryID(parentID, name string, version int) string

Types

type BackPointer 

type BackPointer struct {
	BirthParentID string `json:"birthParentId"`
	NameVersion   int    `json:"nameVersion"`
}

type Config 

type Config struct {
	MountPoint  string
	GatewayAddr string
	Token       string
	Verbose     bool
	Uid         *uint32 // File owner uid (nil = use current user, 0 = root)
	Gid         *uint32 // File owner gid (nil = use current user, 0 = root)
	Backend     string  // "fuse", "nfs", or "" for platform auto-detect
}

Config configures the filesystem mount

type DirEntry 

type DirEntry struct {
	Name  string
	Mode  uint32
	Ino   uint64
	Size  int64 // File size (0 for directories)
	Mtime int64 // Unix timestamp (0 = use current time)
}

type DirectoryAccessMetadata 

type DirectoryAccessMetadata struct {
	PID         string            `json:"pid"`
	ID          string            `json:"id"`
	Permission  uint32            `json:"permission"`
	RenameList  map[string]string `json:"renameList,omitempty"`
	BackPointer *BackPointer      `json:"backPointer,omitempty"`
}

type DirectoryContentMetadata 

type DirectoryContentMetadata struct {
	Id         string               `json:"id"`
	EntryList  []string             `json:"entryList"`
	Timestamps map[string]time.Time `json:"timestamps"`
}

type FileHandle 

type FileHandle uint64

type FileInfo 

type FileInfo struct {
	Ino   uint64
	Size  int64
	Mode  uint32
	Nlink uint32
	Uid   uint32
	Gid   uint32
	Atime time.Time
	Mtime time.Time
	Ctime time.Time
}

func (*FileInfo) IsDir 

func (fi *FileInfo) IsDir() bool

func (*FileInfo) IsRegular 

func (fi *FileInfo) IsRegular() bool
func (fi *FileInfo) IsSymlink() bool

type FileMetadata 

type FileMetadata struct {
	ID       string `json:"id"`
	PID      string `json:"pid"`
	Name     string `json:"name"`
	FileData []byte `json:"fileData"`
}

type Filesystem 

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

Filesystem connects to the gateway via gRPC and exposes a virtual filesystem. It can be mounted via FUSE or NFS depending on the configured backend.

func NewFilesystem 

func NewFilesystem(cfg Config) (*Filesystem, error)

NewFilesystem creates a new Filesystem that connects to the gateway via gRPC. All filesystem operations go through the gateway which handles Redis/S3.

func (*Filesystem) Chmod 

func (f *Filesystem) Chmod(path string, mode uint32) error

func (*Filesystem) Chown 

func (f *Filesystem) Chown(path string, uid, gid uint32) error

func (*Filesystem) Create 

func (f *Filesystem) Create(path string, flags int, mode uint32) (FileHandle, error)

Write operations - delegate to vnodes or fallback storage

func (*Filesystem) Destroy 

func (f *Filesystem) Destroy()

func (*Filesystem) Flush 

func (f *Filesystem) Flush(path string, fh FileHandle) error

Flush and Fsync

Flush is called on every close() of a file descriptor. We intentionally do NOT force-sync to S3 here — that would block every close() for ~300ms. Data safety is ensured by:

  • Release (last fd close): ForceFlush to S3
  • Fsync (explicit sync): ForceFlush to S3
  • AsyncWriter debounce timer: uploads within 500ms
  • Read path: serves dirty data from asyncWriter memory

func (*Filesystem) Fsync 

func (f *Filesystem) Fsync(path string, datasync bool, fh FileHandle) error

func (*Filesystem) Getattr 

func (f *Filesystem) Getattr(path string) (*FileInfo, error)

func (*Filesystem) Getxattr 

func (f *Filesystem) Getxattr(path, name string) ([]byte, error)

Getxattr returns empty data for all xattrs (we do not store them).

func (*Filesystem) Init 

func (f *Filesystem) Init() error

func (*Filesystem) IsDestroyed 

func (f *Filesystem) IsDestroyed() bool

func (*Filesystem) IsMounted 

func (f *Filesystem) IsMounted() bool
func (f *Filesystem) Link(oldpath, newpath string) error

func (*Filesystem) Listxattr 

func (f *Filesystem) Listxattr(path string) ([]string, error)

func (*Filesystem) Mkdir 

func (f *Filesystem) Mkdir(path string, mode uint32) error

func (*Filesystem) Mount 

func (f *Filesystem) Mount() error

func (*Filesystem) Open 

func (f *Filesystem) Open(path string, flags int) (FileHandle, error)

func (*Filesystem) Opendir 

func (f *Filesystem) Opendir(path string) (FileHandle, error)

func (*Filesystem) Read 

func (f *Filesystem) Read(path string, buf []byte, off int64, fh FileHandle) (int, error)

func (*Filesystem) Readdir 

func (f *Filesystem) Readdir(path string) ([]DirEntry, error)
func (f *Filesystem) Readlink(path string) (string, error)

Symlink operations

func (*Filesystem) RegisterVNode 

func (f *Filesystem) RegisterVNode(node vnode.VirtualNode)

RegisterVNode registers a virtual node handler for a path prefix

func (*Filesystem) Release 

func (f *Filesystem) Release(path string, fh FileHandle) error

func (*Filesystem) Releasedir 

func (f *Filesystem) Releasedir(path string, fh FileHandle) error

func (*Filesystem) Removexattr 

func (f *Filesystem) Removexattr(path, name string) error

Removexattr silently succeeds since we don't store xattrs.

func (*Filesystem) Rename 

func (f *Filesystem) Rename(oldpath, newpath string) error

func (*Filesystem) Rmdir 

func (f *Filesystem) Rmdir(path string) error

func (*Filesystem) SetStorageFallback 

func (f *Filesystem) SetStorageFallback(node vnode.VirtualNode)

SetStorageFallback sets the fallback vnode for unmatched storage paths

func (*Filesystem) Setxattr 

func (f *Filesystem) Setxattr(path, name string, value []byte, flags int) error

Setxattr silently accepts and discards extended attributes.

func (*Filesystem) Statfs 

func (f *Filesystem) Statfs() (*StatInfo, error)
func (f *Filesystem) Symlink(target, newpath string) error

func (*Filesystem) Truncate 

func (f *Filesystem) Truncate(path string, size int64, fh FileHandle) error
func (f *Filesystem) Unlink(path string) error

func (*Filesystem) Unmount 

func (f *Filesystem) Unmount() error

func (*Filesystem) Utimens 

func (f *Filesystem) Utimens(path string, atime, mtime *int64) error

func (*Filesystem) Write 

func (f *Filesystem) Write(path string, buf []byte, off int64, fh FileHandle) (int, error)

type FuseBackend added in v0.1.36 

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

FuseBackend mounts the filesystem using FUSE (via cgofuse). This is the default backend on all platforms where FUSE is available. On macOS it uses fuse-t; on Linux it uses libfuse.

func NewFuseBackend added in v0.1.36 

func NewFuseBackend() *FuseBackend

NewFuseBackend creates a new FUSE mount backend.

func (*FuseBackend) Mount added in v0.1.36 

func (b *FuseBackend) Mount(fs *Filesystem, mountPoint string) error

func (*FuseBackend) Unmount added in v0.1.36 

func (b *FuseBackend) Unmount() error

type FuseTrace 

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

FuseTrace is an opt-in, low-overhead tracer for the FUSE layer.

Enable with: 

AIRSTORE_FUSE_TRACE=1

Optional: 

AIRSTORE_FUSE_TRACE_INTERVAL=2s   (default: 2s)
AIRSTORE_FUSE_TRACE_SLOW_MS=50    (default: 50ms; 0 disables slow-op logging)

type GRPCConfig 

type GRPCConfig struct {
	GatewayAddr string
	Token       string
}

GRPCConfig holds configuration for connecting to the gateway.

type GRPCMetadataEngine 

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

GRPCMetadataEngine implements MetadataEngine and LegacyMetadataEngine via gRPC.

func NewGRPCMetadataEngine 

func NewGRPCMetadataEngine(cfg GRPCConfig) (*GRPCMetadataEngine, error)

NewGRPCMetadataEngine creates a new gRPC-based metadata engine.

func (*GRPCMetadataEngine) Close 

func (m *GRPCMetadataEngine) Close() error

Close closes the gRPC connection.

func (*GRPCMetadataEngine) Conn 

func (m *GRPCMetadataEngine) Conn() *grpc.ClientConn

Conn returns the underlying gRPC connection for sharing with other services.

func (*GRPCMetadataEngine) DeleteDirectory 

func (m *GRPCMetadataEngine) DeleteDirectory(parentID, name string, version int) error

func (*GRPCMetadataEngine) GetDirectoryAccessMetadata 

func (m *GRPCMetadataEngine) GetDirectoryAccessMetadata(pid, name string) (*DirectoryAccessMetadata, error)

func (*GRPCMetadataEngine) GetDirectoryContentMetadata 

func (m *GRPCMetadataEngine) GetDirectoryContentMetadata(id string) (*DirectoryContentMetadata, error)

func (*GRPCMetadataEngine) GetFileMetadata 

func (m *GRPCMetadataEngine) GetFileMetadata(pid, name string) (*FileMetadata, error)

func (*GRPCMetadataEngine) ListDirectory 

func (m *GRPCMetadataEngine) ListDirectory(path string) []DirEntry

func (*GRPCMetadataEngine) RenameDirectory 

func (m *GRPCMetadataEngine) RenameDirectory(oldPID, oldName, newPID, newName string, version int) error

func (*GRPCMetadataEngine) SaveDirectoryAccessMetadata 

func (m *GRPCMetadataEngine) SaveDirectoryAccessMetadata(meta *DirectoryAccessMetadata) error

func (*GRPCMetadataEngine) SaveDirectoryContentMetadata 

func (m *GRPCMetadataEngine) SaveDirectoryContentMetadata(meta *DirectoryContentMetadata) error

func (*GRPCMetadataEngine) SaveFileMetadata 

func (m *GRPCMetadataEngine) SaveFileMetadata(meta *FileMetadata) error

type LegacyMetadataEngine 

type LegacyMetadataEngine interface {
	GetDirectoryContentMetadata(id string) (*DirectoryContentMetadata, error)
	GetDirectoryAccessMetadata(pid, name string) (*DirectoryAccessMetadata, error)
	GetFileMetadata(pid, name string) (*FileMetadata, error)
	SaveDirectoryContentMetadata(meta *DirectoryContentMetadata) error
	SaveDirectoryAccessMetadata(meta *DirectoryAccessMetadata) error
	SaveFileMetadata(meta *FileMetadata) error
	ListDirectory(path string) []DirEntry
	RenameDirectory(oldPID, oldName, newPID, newName string, version int) error
	DeleteDirectory(parentID, name string, version int) error
}

LegacyMetadataEngine provides filesystem metadata operations via gRPC. This interface is for backward compatibility with the old FUSE implementation. New code should use the path-based MetadataEngine interface.

type MountBackend added in v0.1.36 

type MountBackend interface {
	// Mount presents the filesystem at the given mount point.
	// This call blocks until the filesystem is unmounted.
	Mount(fs *Filesystem, mountPoint string) error

	// Unmount requests the filesystem to be unmounted.
	Unmount() error
}

MountBackend abstracts how the filesystem is presented to the OS. Supported backends: "fuse" (default) and "nfs" (Linux fallback when FUSE is unavailable).

func NewBackend added in v0.1.36 

func NewBackend(name string) MountBackend

NewBackend creates a MountBackend by name. Callers should resolve "" to a concrete name via defaultBackend() before calling.

type NFSBackend added in v0.1.36 

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

NFSBackend mounts the filesystem by running a userspace NFSv3 server on loopback and mounting it via the kernel NFS client. This is the fallback for Linux environments where FUSE (/dev/fuse) is not available.

func NewNFSBackend added in v0.1.36 

func NewNFSBackend() *NFSBackend

NewNFSBackend creates a new NFS mount backend.

func (*NFSBackend) Mount added in v0.1.36 

func (b *NFSBackend) Mount(fs *Filesystem, mountPoint string) error

func (*NFSBackend) Unmount added in v0.1.36 

func (b *NFSBackend) Unmount() error

type NodeInfo 

type NodeInfo struct {
	Path string
	ID   string
	PID  string
}

type StatInfo 

type StatInfo struct {
	Bsize   uint64
	Blocks  uint64
	Bfree   uint64
	Bavail  uint64
	Files   uint64
	Ffree   uint64
	Namemax uint64
}

Source Files

View all Source files

Directories

Path Synopsis
Package vnode provides virtual filesystem nodes for the FUSE layer.
 Package vnode provides virtual filesystem nodes for the FUSE layer.
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