There are some _write callbacks left only returning EROFS, replace them
by null_write. return EROFS from null_write().
Reviewed by: cem, imp, kan
Differential Revision: https://reviews.freebsd.org/D14523
bootp/arp/rarp/rpc all use the sendrecv implementation in net.c. tftp has
its own implementation because it passes an extra parameter into the recv
callback for the received payload type to be held.
These sendrecv implementations are otherwise equivalent, so consolidate
them. The other users of sendrecv won't be using the extra argument to recv,
but this gives us only one place to worry about respecting timeouts and one
consistent timeout behavior.
Tested by: sbruno
Reviewed by: sbruno, tsoome
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D14373
readip() doesn't, at the moment, properly indicate to callers that it has
timed out. One can tell that it's timed out if errno == EAGAIN when it
returns, but this is not ideal. Restructure it a little bit to explicitly
set errno to ETIMEDOUT if we've exhausted tleft.
I found two places that care about where it timed out or not: sendrecv in
net.c and sendrecv_tftp. Both are structured to pass smaller timeout values
to readip while tracking a larger timeout. Neither of them were able to do
this properly with readip not indicating ETIMEDOUT, so fix it.
While here, straighten out the time (t/t1) usage in sendrecv_tftp.
This would have manifested itself in periodic failures to NFS/TFTP boot for
no apparent reason because MINTMO/MAXTMO were not actually being respected
properly. Problems were not reported with NFS, only TFTP.
Reported by: sbruno
Reviewed by: sbruno, tsoome
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D14350
