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nbd: Improve debug traces on little-endian 

Print debug tracing messages while data is still in native
ordering, rather than after we've potentially swapped it into
network order for transmission.  Also, it's nice if the server
mentions what it is replying, to correlate it to with what the
client says it is receiving.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1459913704-19949-4-git-send-email-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Blake 2016-04-05 21:35:04 -06:00 committed by Paolo Bonzini
parent 8c6597123a
commit 7548fe3116
2 changed files with 7 additions and 6 deletions
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8
nbd/client.c
View File

@ -628,16 +628,16 @@ ssize_t nbd_send_request(QIOChannel *ioc, struct nbd_request *request)
uint8_t buf[NBD_REQUEST_SIZE];
ssize_t ret;
TRACE("Sending request to server: "
"{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
request->from, request->len, request->handle, request->type);
cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC);
cpu_to_be32w((uint32_t*)(buf + 4), request->type);
cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
cpu_to_be64w((uint64_t*)(buf + 16), request->from);
cpu_to_be32w((uint32_t*)(buf + 24), request->len);
TRACE("Sending request to server: "
"{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
request->from, request->len, request->handle, request->type);
ret = write_sync(ioc, buf, sizeof(buf));
if (ret < 0) {
return ret;

5
nbd/server.c
View File

@ -656,6 +656,9 @@ static ssize_t nbd_send_reply(QIOChannel *ioc, struct nbd_reply *reply)
reply->error = system_errno_to_nbd_errno(reply->error);
TRACE("Sending response to client: { .error = %d, handle = %" PRIu64 " }",
reply->error, reply->handle);
/* Reply
[ 0 .. 3] magic (NBD_REPLY_MAGIC)
[ 4 .. 7] error (0 == no error)
@ -665,8 +668,6 @@ static ssize_t nbd_send_reply(QIOChannel *ioc, struct nbd_reply *reply)
stl_be_p(buf + 4, reply->error);
stq_be_p(buf + 8, reply->handle);
TRACE("Sending response to client");
ret = write_sync(ioc, buf, sizeof(buf));
if (ret < 0) {
return ret;