block: Introduce bdrv_co_do_pwritev()
This is going to become the bdrv_co_do_preadv() equivalent for writes. In this patch, however, just a function taking byte offsets is created, it doesn't align anything yet. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NBenoit Canet <benoit@irqsave.net>
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