dd217b8732
Move all the writes to the migration_thread, and make writings blocking. Notice that are still using the iothread for everything that we do. Signed-off-by: Juan Quintela <quintela@redhat.com>
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/*
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* QEMU live migration via Unix Domain Sockets
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*
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* Copyright Red Hat, Inc. 2009
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*
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* Authors:
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* Chris Lalancette <clalance@redhat.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/sockets.h"
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#include "migration/migration.h"
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#include "migration/qemu-file.h"
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#include "block/block.h"
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//#define DEBUG_MIGRATION_UNIX
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#ifdef DEBUG_MIGRATION_UNIX
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#define DPRINTF(fmt, ...) \
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do { printf("migration-unix: " 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 unix_errno(MigrationState *s)
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{
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return errno;
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}
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static int unix_write(MigrationState *s, const void * buf, size_t size)
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{
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return write(s->fd, buf, size);
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}
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static int unix_close(MigrationState *s)
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{
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int r = 0;
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DPRINTF("unix_close\n");
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if (close(s->fd) < 0) {
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r = -errno;
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}
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return r;
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}
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static void unix_wait_for_connect(int fd, void *opaque)
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{
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MigrationState *s = opaque;
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if (fd < 0) {
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DPRINTF("migrate connect error\n");
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s->fd = -1;
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migrate_fd_error(s);
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} else {
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DPRINTF("migrate connect success\n");
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s->fd = fd;
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socket_set_block(s->fd);
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migrate_fd_connect(s);
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}
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}
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void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
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{
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s->get_error = unix_errno;
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s->write = unix_write;
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s->close = unix_close;
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s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
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}
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static void unix_accept_incoming_migration(void *opaque)
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{
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struct sockaddr_un 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 && errno == EINTR);
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qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
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close(s);
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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 out;
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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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return;
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out:
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close(c);
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}
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void unix_start_incoming_migration(const char *path, Error **errp)
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{
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int s;
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s = unix_listen(path, NULL, 0, errp);
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if (s < 0) {
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return;
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}
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qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL,
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(void *)(intptr_t)s);
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}
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