These patches improve the error report if the file format was specified explicitly (example: -drive file=myfile,format=qcow2) and the given format does not match the real format.
They fix those bugs: https://bugzilla.redhat.com/show_bug.cgi?id=556482 https://bugs.launchpad.net/qemu/+bug/1090600 Changes in v2: * Use error code EMEDIUMTYPE instead of inventing a new one. * Split modifications in block/vdi.c into 3 separate patches. I decided to use EMEDIUMTYPE because I think that it matches best the kind of error which we want to describe here. EINVAL is too unspecific, and ENOTTY means something completely different, therefore I did not use one of those suggested values. Cheers, Stefan [PATCH v2 1/5] block: Add special error code for wrong format [PATCH v2 2/5] block: Use error code EMEDIUMTYPE for wrong format in [PATCH v2 3/5] block/vdi: Improve debug output for signature [PATCH v2 4/5] block/vdi: Improved return values from vdi_open [PATCH v2 5/5] block/vdi: Check for bad signature
