* fhandler_disk_file.cc (get_ino_by_handle): Rename pfai to fai.

	* fhandler_disk_file.cc (get_ino_by_handle): Rename pfai to fai.
	(fhandler_base::fstat_by_handle): Drop fai_size and pfai in favor of
	static struct fai_buf.  Restructure.
	(fhandler_base::fstat_by_name): Drop fvi_size and pfvi.  Drop fdi_size
	and pfdi in favor of static struct fdi_buf.  Drop redundant test for
	existance.  Use FileDirectoryInformation class instead of
	FileBothDirectoryInformation.  Drop call to NtQueryVolumeInformationFile
	in favor of using pc.fs_serial_number ().  Fix FileId information given
	to fstat_helper.
	(fhandler_disk_file::fstatvfs): Drop fvi_size, pfvi, fai_size and pfai.
	Drop getting FileFsVolumeInformation and FileFsAttributeInformation in
	favor of using the related path_conv info.
	(fhandler_disk_file::opendir): Fix comment.
	(fhandler_disk_file::readdir): Ditto.  Use FileDirectoryInformation
	class instead of FileBothDirectoryInformation.
	* path.cc (fs_info::update): Store MaximumComponentNameLength in new
	member name_len.
	* path.h (struct fs_info): Use ULONG rather than DWORD.  Add member
	name_len to store MaximumComponentNameLength.  Add accessor methods.
	(path_conv::fs_name_len): New method.