160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu-common.h"
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#include "qemu_socket.h"
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#include "migration.h"
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#include "qemu-char.h"
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#include "buffered_file.h"
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#include "block.h"
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//#define DEBUG_MIGRATION_TCP
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#ifdef DEBUG_MIGRATION_TCP
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#define DPRINTF(fmt, ...) \
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do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0)
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#endif
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static int socket_errno(MigrationState *s)
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{
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return socket_error();
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}
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static int socket_write(MigrationState *s, const void * buf, size_t size)
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{
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return send(s->fd, buf, size, 0);
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}
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static int tcp_close(MigrationState *s)
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{
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int r = 0;
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DPRINTF("tcp_close\n");
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if (s->fd != -1) {
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if (close(s->fd) < 0) {
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r = -errno;
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}
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s->fd = -1;
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}
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return r;
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}
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static void tcp_wait_for_connect(void *opaque)
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{
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MigrationState *s = opaque;
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int val, ret;
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socklen_t valsize = sizeof(val);
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DPRINTF("connect completed\n");
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do {
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ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
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} while (ret == -1 && (socket_error()) == EINTR);
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if (ret < 0) {
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migrate_fd_error(s);
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return;
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}
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qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
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if (val == 0)
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migrate_fd_connect(s);
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else {
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DPRINTF("error connecting %d\n", val);
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migrate_fd_error(s);
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}
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}
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int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
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Error **errp)
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{
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s->get_error = socket_errno;
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s->write = socket_write;
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s->close = tcp_close;
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s->fd = inet_connect(host_port, false, errp);
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if (!error_is_set(errp)) {
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migrate_fd_connect(s);
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} else if (error_is_type(*errp, QERR_SOCKET_CONNECT_IN_PROGRESS)) {
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DPRINTF("connect in progress\n");
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qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
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} else if (error_is_type(*errp, QERR_SOCKET_CREATE_FAILED)) {
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DPRINTF("connect failed\n");
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return -1;
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} else if (error_is_type(*errp, QERR_SOCKET_CONNECT_FAILED)) {
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DPRINTF("connect failed\n");
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migrate_fd_error(s);
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return -1;
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} else {
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DPRINTF("unknown error\n");
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return -1;
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}
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return 0;
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}
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static void tcp_accept_incoming_migration(void *opaque)
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{
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struct sockaddr_in addr;
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socklen_t addrlen = sizeof(addr);
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int s = (intptr_t)opaque;
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QEMUFile *f;
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int c;
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do {
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c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
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} while (c == -1 && socket_error() == EINTR);
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DPRINTF("accepted migration\n");
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if (c == -1) {
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fprintf(stderr, "could not accept migration connection\n");
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goto out2;
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}
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f = qemu_fopen_socket(c);
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if (f == NULL) {
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fprintf(stderr, "could not qemu_fopen socket\n");
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goto out;
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}
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process_incoming_migration(f);
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qemu_fclose(f);
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out:
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close(c);
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out2:
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qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
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close(s);
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}
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int tcp_start_incoming_migration(const char *host_port, Error **errp)
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{
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int s;
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s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
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if (s < 0) {
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return -1;
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}
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qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
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(void *)(intptr_t)s);
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return 0;
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}
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