static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds, int is_async) { BlkMigBlock *blk; int64_t total_sectors = bmds->total_sectors; int64_t sector; int nr_sectors; int ret = -EIO; for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) { blk_mig_lock(); if (bmds_aio_inflight(bmds, sector)) { blk_mig_unlock(); bdrv_drain_all(); } else { blk_mig_unlock(); } if (bdrv_get_dirty(bmds->bs, bmds->dirty_bitmap, sector)) { if (total_sectors - sector < BDRV_SECTORS_PER_DIRTY_CHUNK) { nr_sectors = total_sectors - sector; } else { nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; } blk = g_new(BlkMigBlock, 1); blk->buf = g_malloc(BLOCK_SIZE); blk->bmds = bmds; blk->sector = sector; blk->nr_sectors = nr_sectors; if (is_async) { blk->iov.iov_base = blk->buf; blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; qemu_iovec_init_external(&blk->qiov, &blk->iov, 1); blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov, nr_sectors, blk_mig_read_cb, blk); blk_mig_lock(); block_mig_state.submitted++; bmds_set_aio_inflight(bmds, sector, nr_sectors, 1); blk_mig_unlock(); } else { ret = bdrv_read(bmds->bs, sector, blk->buf, nr_sectors); if (ret < 0) { goto error; } blk_send(f, blk); g_free(blk->buf); g_free(blk); } bdrv_reset_dirty(bmds->bs, sector, nr_sectors); break; } sector += BDRV_SECTORS_PER_DIRTY_CHUNK; bmds->cur_dirty = sector; } return (bmds->cur_dirty >= bmds->total_sectors); error: DPRINTF("Error reading sector %" PRId64 "\n", sector); g_free(blk->buf); g_free(blk); return ret; }