-
-static ssize_t buffered_flush(MigrationState *s)
-{
- size_t offset = 0;
- ssize_t ret = 0;
-
- DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
-
- while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
- size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer);
- ret = migrate_fd_put_buffer(s, s->buffer + offset, to_send);
- if (ret <= 0) {
- DPRINTF("error flushing data, %zd\n", ret);
- break;
- } else {
- DPRINTF("flushed %zd byte(s)\n", ret);
- offset += ret;
- s->bytes_xfer += ret;
- }
- }
-
- DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
- memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
- s->buffer_size -= offset;
-
- if (ret < 0) {
- return ret;
- }
- return offset;
-}
-
-static int buffered_put_buffer(void *opaque, const uint8_t *buf,
- int64_t pos, int size)
-{
- MigrationState *s = opaque;
- ssize_t error;
-
- DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
-
- error = qemu_file_get_error(s->file);
- if (error) {
- DPRINTF("flush when error, bailing: %s\n", strerror(-error));
- return error;
- }
-
- if (size <= 0) {
- return size;
- }
-
- if (size > (s->buffer_capacity - s->buffer_size)) {
- DPRINTF("increasing buffer capacity from %zu by %zu\n",
- s->buffer_capacity, size + 1024);
-
- s->buffer_capacity += size + 1024;
-
- s->buffer = g_realloc(s->buffer, s->buffer_capacity);
- }
-
- memcpy(s->buffer + s->buffer_size, buf, size);
- s->buffer_size += size;
-
- return size;
-}
-
-static int buffered_close(void *opaque)
-{
- MigrationState *s = opaque;
- ssize_t ret = 0;
- int ret2;
-
- DPRINTF("closing\n");
-
- s->xfer_limit = INT_MAX;
- while (!qemu_file_get_error(s->file) && s->buffer_size) {
- ret = buffered_flush(s);
- if (ret < 0) {
- break;
- }
- }
-
- ret2 = migrate_fd_close(s);
- if (ret >= 0) {
- ret = ret2;
- }
- ret = migrate_fd_close(s);
- s->complete = true;
- return ret;
-}
-
-static int buffered_get_fd(void *opaque)
-{
- MigrationState *s = opaque;
-
- return s->fd;
-}
-
-/*
- * The meaning of the return values is:
- * 0: We can continue sending
- * 1: Time to stop
- * negative: There has been an error
- */
-static int buffered_rate_limit(void *opaque)
-{
- MigrationState *s = opaque;
- int ret;
-
- ret = qemu_file_get_error(s->file);
- if (ret) {
- return ret;
- }
-
- if (s->bytes_xfer > s->xfer_limit) {
- return 1;
- }
-
- return 0;
-}
-
-static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
-{
- MigrationState *s = opaque;
- if (qemu_file_get_error(s->file)) {
- goto out;
- }
- if (new_rate > SIZE_MAX) {
- new_rate = SIZE_MAX;
- }
-
- s->xfer_limit = new_rate / 10;
-
-out:
- return s->xfer_limit;
-}
-
-static int64_t buffered_get_rate_limit(void *opaque)
-{
- MigrationState *s = opaque;
-
- return s->xfer_limit;
-}
-
-static bool migrate_fd_put_ready(MigrationState *s, uint64_t max_size)
-{
- int ret;
- uint64_t pending_size;
- bool last_round = false;
-
- qemu_mutex_lock_iothread();
- if (s->state != MIG_STATE_ACTIVE) {
- DPRINTF("put_ready returning because of non-active state\n");
- qemu_mutex_unlock_iothread();
- return false;
- }
- if (s->first_time) {
- s->first_time = false;
- DPRINTF("beginning savevm\n");
- ret = qemu_savevm_state_begin(s->file, &s->params);
- if (ret < 0) {
- DPRINTF("failed, %d\n", ret);
- migrate_fd_error(s);
- qemu_mutex_unlock_iothread();
- return false;
- }
- }
-
- DPRINTF("iterate\n");
- pending_size = qemu_savevm_state_pending(s->file, max_size);
- DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
- if (pending_size >= max_size) {
- ret = qemu_savevm_state_iterate(s->file);
- if (ret < 0) {
- migrate_fd_error(s);
- }
- } else {
- int old_vm_running = runstate_is_running();
- int64_t start_time, end_time;
-
- DPRINTF("done iterating\n");
- start_time = qemu_get_clock_ms(rt_clock);
- qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
- if (old_vm_running) {
- vm_stop(RUN_STATE_FINISH_MIGRATE);
- } else {
- vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
- }
-
- if (qemu_savevm_state_complete(s->file) < 0) {
- migrate_fd_error(s);
- } else {
- migrate_fd_completed(s);
- }
- end_time = qemu_get_clock_ms(rt_clock);
- s->total_time = end_time - s->total_time;
- s->downtime = end_time - start_time;
- if (s->state != MIG_STATE_COMPLETED) {
- if (old_vm_running) {
- vm_start();
- }
- }
- last_round = true;
- }
- qemu_mutex_unlock_iothread();
-
- return last_round;
-}
-
-static void *buffered_file_thread(void *opaque)