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 /* XXX figure out if we can create a variant on 47 * qio_channel_yield() that works with AIO contexts 48 * and consider using that in this branch */ 49 qemu_coroutine_yield(); 50 } else if (done) { 51 /* XXX this is needed by nbd_reply_ready. */ 52 qio_channel_wait(ioc, 53 do_read ? G_IO_IN : G_IO_OUT); 54 } else { 55 return -EAGAIN; 56 } 57 continue; 58 } 59 if (len < 0) { 60 TRACE("I/O error: %s", error_get_pretty(local_err)); 61 error_free(local_err); 62 /* XXX handle Error objects */ 63 done = -EIO; 64 goto cleanup; 65 } 66 67 if (do_read && len == 0) { 68 break; 69 } 70 71 iov_discard_front(&local_iov, &nlocal_iov, len); 72 done += len; 73 } 74 75 cleanup: 76 g_free(local_iov_head); 77 return done; 78 } 79 80 81 void nbd_tls_handshake(Object *src, 82 Error *err, 83 void *opaque) 84 { 85 struct NBDTLSHandshakeData *data = opaque; 86 87 if (err) { 88 TRACE("TLS failed %s", error_get_pretty(err)); 89 data->error = error_copy(err); 90 } 91 data->complete = true; 92 g_main_loop_quit(data->loop); 93 } 94