From 8ecaeae82241b6e317d19e5558e52f9e2f979f74 Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Fri, 7 Jul 2017 15:30:47 -0500 Subject: nbd: Implement NBD_OPT_GO on client NBD_OPT_EXPORT_NAME is lousy: per the NBD protocol, any failure requires the server to close the connection rather than report an error to us. Therefore, upstream NBD recently added NBD_OPT_GO as the improved version of the option that does what we want [1]: it reports sane errors on failures, and on success provides at least as much info as NBD_OPT_EXPORT_NAME. [1] https://github.com/NetworkBlockDevice/nbd/blob/extension-info/doc/proto.md This is a first cut at use of the information types. Note that we do not need to use NBD_OPT_INFO, and that use of NBD_OPT_GO means we no longer have to use NBD_OPT_LIST to learn whether a server requires TLS (this requires servers that gracefully handle unknown NBD_OPT, many servers prior to qemu 2.5 were buggy, but I have patched qemu, upstream nbd, and nbdkit in the meantime, in part because of interoperability testing with this patch). We still fall back to NBD_OPT_LIST when NBD_OPT_GO is not supported on the server, as it is still one last chance for a nicer error message. Later patches will use further info, like NBD_INFO_BLOCK_SIZE. Signed-off-by: Eric Blake Message-Id: <20170707203049.534-8-eblake@redhat.com> Signed-off-by: Paolo Bonzini --- nbd/trace-events | 3 +++ 1 file changed, 3 insertions(+) (limited to 'nbd/trace-events') diff --git a/nbd/trace-events b/nbd/trace-events index 5230c61ab1..bd09fab375 100644 --- a/nbd/trace-events +++ b/nbd/trace-events @@ -3,6 +3,9 @@ nbd_unknown_error(int err) "Squashing unexpected error %d to EINVAL" nbd_send_option_request(uint32_t opt, const char *name, uint32_t len) "Sending option request %" PRIu32" (%s), len %" PRIu32 nbd_receive_option_reply(uint32_t option, const char *optname, uint32_t type, const char *typename, uint32_t length) "Received option reply %" PRIx32" (%s), type %" PRIx32" (%s), len %" PRIu32 nbd_reply_err_unsup(uint32_t option, const char *name) "server doesn't understand request %" PRIx32 " (%s), attempting fallback" +nbd_opt_go_start(const char *name) "Attempting NBD_OPT_GO for export '%s'" +nbd_opt_go_success(void) "Export is good to go" +nbd_opt_go_info_unknown(int info, const char *name) "Ignoring unknown info %d (%s)" nbd_receive_query_exports_start(const char *wantname) "Querying export list for '%s'" nbd_receive_query_exports_success(const char *wantname) "Found desired export name '%s'" nbd_receive_starttls_request(void) "Requesting TLS from server" -- cgit v1.2.3-55-g7522