Given the overlap between (DM|QT)EXCL, it's not clear to me which of these is considered the authority for indicating exclusive access.
devusb.c plays with DMEXCL, devcons.c with QTEXCL. I'm assumed the DMEXCL bit was magically getting propagated down to QTEXCL in qid.type, but I'll be damned if I can find anything in the kernel that actually does anything with either of these bits. WTF am I missing? This should be stunningly obvious. Someone please stun me more than I am :-P My interest is in the context of `Chan's. --lyndon
