mount 行不?
http://www.kernel.org/doc/man-pages/online/pages/man2/mount.2.html
EACCES A component of a path was not searchable. (See also
path_resolution(7).) Or, mounting a read-only file system was
attempted without giving the MS_RDONLY flag. Or, the block device
source is located on a file system mounted with the MS_NODEV option.