block: Introduce bdrv_aligned_preadv()
This separates the part of bdrv_co_do_readv() that needs to happen before the request is modified to match the backend alignment, and a part that needs to be executed afterwards and passes the request to the BlockDriver. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NWenchao Xia <xiawenc@linux.vnet.ibm.com> Reviewed-by: NMax Reitz <mreitz@redhat.com>
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