tmpfs

type FilesystemOpts struct {
	// RootFileType is the FileType of the filesystem root. Valid values
	// are: S_IFDIR, S_IFREG, and S_IFLNK. Defaults to S_IFDIR.
	RootFileType uint16

	// RootSymlinkTarget is the target of the root symlink. Only valid if
	// RootFileType == S_IFLNK.
	RootSymlinkTarget string

	// FilesystemType allows setting a different FilesystemType for this
	// tmpfs filesystem. This allows tmpfs to "impersonate" other
	// filesystems, like ramdiskfs and cgroupfs.
	FilesystemType vfs.FilesystemType

	// Usage is the memory accounting category under which pages backing files in
	// the filesystem are accounted.
	Usage *usage.MemoryKind

	// MaxFilenameLen is the maximum filename length allowed by the tmpfs.
	MaxFilenameLen int

	// MemoryFile is the memory file that will be used to store file data. If
	// this is nil, then MemoryFileFromContext() is used.
	MemoryFile *pgalloc.MemoryFile

	// DisableDefaultSizeLimit disables setting a default size limit. In Linux,
	// SB_KERNMOUNT has this effect on tmpfs mounts; see mm/shmem.c:shmem_fill_super().
	DisableDefaultSizeLimit bool

	// AllowXattrPrefix is a set of xattr namespace prefixes that this
	// tmpfs mount will allow.
	AllowXattrPrefix []string

	// SourceTar is the source tar file to be untarred into the tmpfs.
	// Ownership is transferred to GetFilesystem, whether or not it returns an
	// error. If SourceTarFSCheckpoint is true, SourceTar was produced by a
	// call to FSCheckpoint, and the caller is responsible for restoring
	// MemoryFile's contents; otherwise, SourceTar was produced by a call to
	// TarWrite.
	SourceTar             io.ReadCloser
	SourceTarFSCheckpoint bool
}

type FilesystemType struct{}