ff82911cd3
In the client, read the reply headers from a coroutine, switching the read side between the "read header" coroutine and the I/O coroutine that reads the body of the reply. In the server, if the server can read more requests it will create a new "read request" coroutine as soon as a request has been read. Otherwise, the new coroutine is created in nbd_request_put. Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 20170213135235.12274-8-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
|
|
*
|
|
* Network Block Device Common Code
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; under version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "nbd-internal.h"
|
|
|
|
ssize_t nbd_wr_syncv(QIOChannel *ioc,
|
|
struct iovec *iov,
|
|
size_t niov,
|
|
size_t length,
|
|
bool do_read)
|
|
{
|
|
ssize_t done = 0;
|
|
Error *local_err = NULL;
|
|
struct iovec *local_iov = g_new(struct iovec, niov);
|
|
struct iovec *local_iov_head = local_iov;
|
|
unsigned int nlocal_iov = niov;
|
|
|
|
nlocal_iov = iov_copy(local_iov, nlocal_iov, iov, niov, 0, length);
|
|
|
|
while (nlocal_iov > 0) {
|
|
ssize_t len;
|
|
if (do_read) {
|
|
len = qio_channel_readv(ioc, local_iov, nlocal_iov, &local_err);
|
|
} else {
|
|
len = qio_channel_writev(ioc, local_iov, nlocal_iov, &local_err);
|
|
}
|
|
if (len == QIO_CHANNEL_ERR_BLOCK) {
|
|
if (qemu_in_coroutine()) {
|
|
qio_channel_yield(ioc, do_read ? G_IO_IN : G_IO_OUT);
|
|
} else {
|
|
return -EAGAIN;
|
|
}
|
|
continue;
|
|
}
|
|
if (len < 0) {
|
|
TRACE("I/O error: %s", error_get_pretty(local_err));
|
|
error_free(local_err);
|
|
/* XXX handle Error objects */
|
|
done = -EIO;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (do_read && len == 0) {
|
|
break;
|
|
}
|
|
|
|
iov_discard_front(&local_iov, &nlocal_iov, len);
|
|
done += len;
|
|
}
|
|
|
|
cleanup:
|
|
g_free(local_iov_head);
|
|
return done;
|
|
}
|
|
|
|
|
|
void nbd_tls_handshake(QIOTask *task,
|
|
void *opaque)
|
|
{
|
|
struct NBDTLSHandshakeData *data = opaque;
|
|
|
|
if (qio_task_propagate_error(task, &data->error)) {
|
|
TRACE("TLS failed %s", error_get_pretty(data->error));
|
|
}
|
|
data->complete = true;
|
|
g_main_loop_quit(data->loop);
|
|
}
|