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1c778ef729
Now that all callers are converted to use I/O channels for initial connection setup, it is possible to switch the core NBD protocol handling core over to use QIOChannel APIs for actual sockets I/O. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1455129674-17255-7-git-send-email-berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
78 lines
2.4 KiB
C
78 lines
2.4 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 "nbd-internal.h"
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ssize_t nbd_wr_syncv(QIOChannel *ioc,
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struct iovec *iov,
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size_t niov,
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size_t offset,
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size_t length,
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bool do_read)
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{
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ssize_t done = 0;
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Error *local_err = NULL;
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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,
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iov, niov,
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offset, 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, &local_err);
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} else {
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len = qio_channel_writev(ioc, local_iov, nlocal_iov, &local_err);
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}
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if (len == QIO_CHANNEL_ERR_BLOCK) {
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if (qemu_in_coroutine()) {
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/* XXX figure out if we can create a variant on
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* qio_channel_yield() that works with AIO contexts
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* and consider using that in this branch */
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qemu_coroutine_yield();
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} else {
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qio_channel_wait(ioc,
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do_read ? G_IO_IN : G_IO_OUT);
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}
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continue;
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}
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if (len < 0) {
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TRACE("I/O error: %s", error_get_pretty(local_err));
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error_free(local_err);
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/* XXX handle Error objects */
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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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