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block/io: allow 64bit write-zeroes requests
Now that all drivers are updated by previous commit, we can drop two last limiters on write-zeroes path: INT_MAX in bdrv_co_do_pwrite_zeroes() and bdrv_check_request32() in bdrv_co_pwritev_part(). Now everything is prepared for implementing incredibly cool and fast big-write-zeroes in NBD and qcow2. And any other driver which wants it of course. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20210903102807.27127-9-vsementsov@virtuozzo.com> Signed-off-by: Eric Blake <eblake@redhat.com>
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