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iscsi: Switch to .bdrv_co_block_status()
We are gradually moving away from sector-based interfaces, towards byte-based. Update the iscsi driver accordingly. In this case, it is handy to teach iscsi_co_block_status() to handle a NULL map and file parameter, even though the block layer passes non-NULL values, because we also call the function directly. For now, there are no optimizations done based on the want_zero flag. We can also make the simplification of asserting that the block layer passed in aligned values. Signed-off-by:Eric Blake <eblake@redhat.com> Reviewed-by:
Fam Zheng <famz@redhat.com> Signed-off-by:
Kevin Wolf <kwolf@redhat.com>
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