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Since refcounts do not always have to be a uint16_t, all refcount blocks and arrays in memory should not have a specific type (thus they become pointers to void) and for accessing them, two helper functions are used (a getter and a setter). Those functions are called indirectly through function pointers in the BDRVQcowState so they may later be exchanged for different refcount orders. With the check and repair functions using this function, the refcount array they are creating will be in big endian byte order; additionally, using realloc_refcount_array() makes the size of this refcount array always cluster-aligned. Both combined allow rebuild_refcount_structure() to drop the bounce buffer which was used to convert parts of the refcount array to big endian byte order and store them on disk. Instead, those parts can now be written directly. [ kwolf: Fixed a build failure on 32 bit and another with old glib ] Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team