Kevin Wolf 5ea929e3d1 qcow2: Add bdrv_discard support
This adds a bdrv_discard function to qcow2 that frees the discarded clusters.
It does not yet pass the discard on to the underlying file system driver, but
the space can be reused by future writes to the image.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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Read the documentation in qemu-doc.html.

Fabrice Bellard.
Description
A fork of QEMU-Nyx which is better suited for my bachelors thesis
Readme 154 MiB
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