be used to run ROM code inside the kernel without having to setup vm86
and without having a x86 CPU at hand.
This code was originally written by SciTech and released under MIT/X11
license for XFree86. It has been refactored be less than half of the
original size, the compiled code being around a third of the former
size. The interface was changed to be a real library, e.g. no global
variables are used.
Ok, ok, a few more words about it: stop holding puffs_cc as a holy
value and passing it around to almost every possible place (popquiz:
which kernel variable does this remind you of?). Instead, pass
the natural choice, puffs_usermount, and fetch puffs_cc via
puffs_cc_getcc() only in routines which actually need it. This
not only simplifies code, but (thanks to the introduction of
puffs_cc_getcc()) enables constructs which weren't previously sanely
possible, say layering as a curious example.
There's still a little to do on this front, but this was the major
fs interface blast.
handle open is requested, it is waited for only if the node was
not previously succesfully opened. The actual wait for the file
handle happens only when the file handle is actually needed (read
or write). This in turn has the effect that reading cached files
will be quick instead of waiting for the file handle from the sftp
server first. The wait previously could be very long if there were
serveral hundred k of outstanding requests in a limited-bandwidth
link.
The code is in some need of serious handholding, but it works, so
I'll leave that as "future work".
When determining what to put in to param->negotiated, it is *NOT*
sufficient to just pick one of offer_tx or offer_rx -- we may need to
use answer_rx or answer_tx as the negotiated parameter. Failure to
pay attention to which case we are handling means we will occasionally
get "old parameter values" stuffed into responses, resulting in
obscure behavior (such as getting luns mixed up after a normal
connection is made) that is very difficult to replicate.
Don't change default to the boot volume until after we've found we aren't
doing -F.
For tool-fdisk enforce -F and use #defines to make code that can no
longer possibly execute compile.
separately
* provide puffs_cc_getcc()
This is in preparation for the removal of you-should-guess-what as
an argument to routines here and there and everywhere.
