a side note, intro(5) says
"The version is
a version number for a file; typically, it is incremented
every time the file is modified."
wouldn't that mean that for devices, the version should change
everytime you read them?
it's interesting that httpd (actually sendfd) already uses qid.path
and qid.vers to generate the entity tag (ETag) header, and pays
attention to if-none-match header. perhaps Op's Tget can have a
similar parameter using path/version.
i keep wanting to go back to our proposal regarding Text/Rext
extension messages. for caching, instead of a Tread a Text("read
if-modified") request is sent. an advantage of Op is that Tget, for
example, combines walk/open/read/clunk into one request to optimize
for high latency networks. Text("get /a/b/foo") could do the same.
