ppc/pnv: Add support for POWER8+ LPC Controller
[qemu.git] / nbd / common.c
1 /*
2 * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
3 *
4 * Network Block Device Common Code
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; under version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include "qemu/osdep.h"
20 #include "qapi/error.h"
21 #include "nbd-internal.h"
22
23 ssize_t nbd_wr_syncv(QIOChannel *ioc,
24 struct iovec *iov,
25 size_t niov,
26 size_t length,
27 bool do_read)
28 {
29 ssize_t done = 0;
30 Error *local_err = NULL;
31 struct iovec *local_iov = g_new(struct iovec, niov);
32 struct iovec *local_iov_head = local_iov;
33 unsigned int nlocal_iov = niov;
34
35 nlocal_iov = iov_copy(local_iov, nlocal_iov, iov, niov, 0, length);
36
37 while (nlocal_iov > 0) {
38 ssize_t len;
39 if (do_read) {
40 len = qio_channel_readv(ioc, local_iov, nlocal_iov, &local_err);
41 } else {
42 len = qio_channel_writev(ioc, local_iov, nlocal_iov, &local_err);
43 }
44 if (len == QIO_CHANNEL_ERR_BLOCK) {
45 if (qemu_in_coroutine()) {
46 qio_channel_yield(ioc, do_read ? G_IO_IN : G_IO_OUT);
47 } else {
48 return -EAGAIN;
49 }
50 continue;
51 }
52 if (len < 0) {
53 TRACE("I/O error: %s", error_get_pretty(local_err));
54 error_free(local_err);
55 /* XXX handle Error objects */
56 done = -EIO;
57 goto cleanup;
58 }
59
60 if (do_read && len == 0) {
61 break;
62 }
63
64 iov_discard_front(&local_iov, &nlocal_iov, len);
65 done += len;
66 }
67
68 cleanup:
69 g_free(local_iov_head);
70 return done;
71 }
72
73
74 void nbd_tls_handshake(QIOTask *task,
75 void *opaque)
76 {
77 struct NBDTLSHandshakeData *data = opaque;
78
79 if (qio_task_propagate_error(task, &data->error)) {
80 TRACE("TLS failed %s", error_get_pretty(data->error));
81 }
82 data->complete = true;
83 g_main_loop_quit(data->loop);
84 }