block/parallels: switch to bdrv_read
Switch the .bdrv_read method implementation from using bdrv_pread() to bdrv_read() on the underlying file, since the latter is subject to i/o throttling while the former is not. Besides, since bdrv_read() operates in sectors rather than bytes, adjust the helper functions to do so too. Signed-off-by: NRoman Kagan <rkagan@parallels.com> Reviewed-by: NDenis V. Lunev <den@openvz.org> Signed-off-by: NDenis V. Lunev <den@openvz.org> Message-id: 1430207220-24458-4-git-send-email-den@openvz.org CC: Kevin Wolf <kwolf@redhat.com> CC: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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