Il 06/03/2013 18:50, Peter Lieven ha scritto: >> > Commit 9a665b2b made bdrv_truncate() call bdrv_drain_all(), but this breaks >> > QCOW images, as well other future image formats (such as VHDX) that may >> > call >> > bdrv_truncate(bs->file) from within a read/write operation. For example, >> > QCOW >> > will cause an assert, due to tracked_requests not being empty (since the >> > read/write that called bdrv_truncate() is still in progress).
I'm not sure such bdrv_truncate calls are necessary. QCOW2 doesn't have them (almost; there is one in qcow2_write_compressed, I'm not even sure that one is necessary though), and I think QCOW's breaks using it with a block device as a backing file. Paolo
