Each of these functions takes an oskit_blkio_t (Section 5.3) interface to the underlying device and a pathname relative to the root directory of the file system, and if the specified file can be found, returns an oskit_blkio_t object that can be used to read from that file. The blkio object returned will have a block size of 1, meaning that there are no alignment restrictions on file reads. The blkio object passed, representing the underlying device, can have a block size greater than 1, but if it is larger than the file system's block size, file system interpretation will fail. Also, any absolute symlinks followed during the open will be interpreted as if this is the root file system.