ufs

type Attr struct {
	Type      uint8  // type of a node
	Mode      uint32 // permission mode
	Uid       uint32 // owner id
	Gid       uint32 // group id of owner
	Rdev      uint64 // device number
	Atime     int64  // last access time
	Mtime     int64  // last modified time
	Ctime     int64  // last change time for meta
	Atimensec uint32 // nanosecond part of atime
	Mtimensec uint32 // nanosecond part of mtime
	Ctimensec uint32 // nanosecond part of ctime
	Nlink     uint64 // number of links (sub-directories or hardlinks)
	Size      uint64 // size of regular file
	Blksize   int64  // 目录默认4096 文件为0
	Block     int64  // 文件size的大小/512
}

type Creator func(properties map[string]interface{}) (UnderFileStorage, error)

type DirEntry struct {
	Attr *Attr
	// Name is the basename of the file in the directory.
	Name string
}

type FileHandle interface {
	Read(dest []byte, off uint64) (int, error)
	Write(data []byte, off uint64) (written uint32, code error)

	// Flush is called for close() call on a file descriptor. In
	// case of duplicated descriptor, it may be called more than
	// once for a file.
	Flush() error

	// This is called to before the file handle is forgotten. This
	// method has no return value, so nothing can synchronizes on
	// the call. Any cleanup that requires specific synchronization or
	// could fail with I/O errors should happen in Flush instead.
	Release()
	Fsync(flags int) error

	// The methods below may be called on closed files, due to
	// concurrency.  In that case, you should return EBADF.
	Truncate(size uint64) error
	Allocate(off uint64, size uint64, mode uint32) error
}

type Ino uint64

type KerberosConf struct {
	Realm                  string
	Kdc                    string
	Principal              string
	NameNodePrincipal      string
	DataTransferProtection string
	KeyTabData             string
}

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

type UnderFileStorage interface {
	// Used for pretty printing.
	String() string

	// Attributes.  This function is the main entry point, through
	// which FUSE discovers which files and directories exist.
	//
	// If the filesystem wants to implement hard-links, it should
	// return consistent non-zero FileInfo.Ino data.  Using
	// hardlinks incurs a performance hit.
	GetAttr(name string) (*base.FileInfo, error)

	// These should update the file's ctime too.
	// Note: raw FUSE setattr is translated into Chmod/Chown/Utimens in the higher level APIs.
	Chmod(name string, mode uint32) error
	Chown(name string, uid uint32, gid uint32) error
	Utimens(name string, Atime *time.Time, Mtime *time.Time) error

	Truncate(name string, size uint64) error

	Access(name string, mode, callerUid, callerGid uint32) error

	// Tree structure
	Link(oldName string, newName string) error
	Mkdir(name string, mode uint32) error
	Mknod(name string, mode uint32, dev uint32) error
	Rename(oldName string, newName string) error
	Rmdir(name string) error
	Unlink(name string) error

	// Extended attributes.
	GetXAttr(name string, attribute string) (data []byte, err error)
	ListXAttr(name string) (attributes []string, err error)
	RemoveXAttr(name string, attr string) error
	SetXAttr(name string, attr string, data []byte, flags int) error

	// File handling.  If opening for writing, the file's mtime
	// should be updated too.
	Open(name string, flags uint32, size uint64) (FileHandle, error)
	Create(name string, flags uint32, mode uint32) (FileHandle, error)

	// Directory handling
	ReadDir(name string) (stream []DirEntry, err error)

	// Symlinks.
	Symlink(value string, linkName string) error
	Readlink(name string) (string, error)

	StatFs(name string) *base.StatfsOut

	Get(name string, flags uint32, off, limit int64) (io.ReadCloser, error)

	Put(name string, reader io.Reader) error
}