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block/io: bdrv_pdiscard: support int64_t bytes parameter
This fixes at least one overflow in qcow2_process_discards, which passes 64bit region length to bdrv_pdiscard where bytes (or sectors in the past) parameter is int since its introduction in 0b919fa. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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