void qmp_block_resize(bool has_device, const char *device, bool has_node_name, const char *node_name, int64_t size, Error **errp) { Error *local_err = NULL; BlockBackend *blk = NULL; BlockDriverState *bs; AioContext *aio_context; int ret; bs = bdrv_lookup_bs(has_device ? device : NULL, has_node_name ? node_name : NULL, &local_err); if (local_err) { error_propagate(errp, local_err); return; } aio_context = bdrv_get_aio_context(bs); aio_context_acquire(aio_context); if (!bdrv_is_first_non_filter(bs)) { error_setg(errp, QERR_FEATURE_DISABLED, "resize"); goto out; } if (size < 0) { error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); goto out; } if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { error_setg(errp, QERR_DEVICE_IN_USE, device); goto out; } blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); ret = blk_insert_bs(blk, bs, errp); if (ret < 0) { goto out; } /* complete all in-flight operations before resizing the device */ bdrv_drain_all(); ret = blk_truncate(blk, size, errp); out: blk_unref(blk); aio_context_release(aio_context); }