block: Switch bdrv_io_limits_intercept() to byte granularity
Request sizes used to be rounded down to the next sector boundary, allowing to bypass the I/O limit. Now all requests are accounted for with their exact byte size. Reported-by: NWenchao Xia <xiawenc@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com>
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