106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/*
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Network Block Device Common Code
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "nbd-internal.h"
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/* nbd_wr_syncv
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* The function may be called from coroutine or from non-coroutine context.
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* When called from non-coroutine context @ioc must be in blocking mode.
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*/
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ssize_t nbd_rwv(QIOChannel *ioc, struct iovec *iov, size_t niov, size_t length,
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bool do_read, Error **errp)
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{
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ssize_t done = 0;
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struct iovec *local_iov = g_new(struct iovec, niov);
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struct iovec *local_iov_head = local_iov;
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unsigned int nlocal_iov = niov;
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nlocal_iov = iov_copy(local_iov, nlocal_iov, iov, niov, 0, length);
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while (nlocal_iov > 0) {
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ssize_t len;
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if (do_read) {
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len = qio_channel_readv(ioc, local_iov, nlocal_iov, errp);
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} else {
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len = qio_channel_writev(ioc, local_iov, nlocal_iov, errp);
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}
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if (len == QIO_CHANNEL_ERR_BLOCK) {
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/* errp should not be set */
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assert(qemu_in_coroutine());
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qio_channel_yield(ioc, do_read ? G_IO_IN : G_IO_OUT);
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continue;
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}
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if (len < 0) {
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done = -EIO;
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goto cleanup;
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}
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if (do_read && len == 0) {
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break;
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}
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iov_discard_front(&local_iov, &nlocal_iov, len);
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done += len;
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}
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cleanup:
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g_free(local_iov_head);
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return done;
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}
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/* Discard length bytes from channel. Return -errno on failure and 0 on
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* success */
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int nbd_drop(QIOChannel *ioc, size_t size, Error **errp)
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{
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ssize_t ret = 0;
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char small[1024];
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char *buffer;
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buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
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while (size > 0) {
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ssize_t count = MIN(65536, size);
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ret = nbd_read(ioc, buffer, MIN(65536, size), errp);
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if (ret < 0) {
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goto cleanup;
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}
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size -= count;
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}
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cleanup:
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if (buffer != small) {
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g_free(buffer);
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}
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return ret;
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}
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void nbd_tls_handshake(QIOTask *task,
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void *opaque)
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{
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struct NBDTLSHandshakeData *data = opaque;
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if (qio_task_propagate_error(task, &data->error)) {
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TRACE("TLS failed %s", error_get_pretty(data->error));
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}
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data->complete = true;
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g_main_loop_quit(data->loop);
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}
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