CLWALK(5) File Formats Manual CLWALK(5)
clwalk - clone, then search a directory, and change to a file within it
Tclwalk tag fid newfid name
Rclwalk tag fid qid
The clwalk request is a combination of a clone request (see clone(5))
followed by a walk request (see walk(5)) on the new fid. If the walk
fails, there is an implicit clunk of newfid.
The clwalk message is an optimization for use on low-speed lines; it is
not generated by the kernel. The cfs(4) cached file system generates
it as a side-effect of any system call that interprets a file name.