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block/rnbd: Set write-back cache and fua same to the target device
The rnbd-client always sets the write-back cache and fua attributes of the rnbd device queue regardless of the target device on the server. That generates IO hang issue when the target device does not support both of write-back cacne and fua. This patch adds more fields for the cache policy and fua into the device opening message. The rnbd-server sends the information if the target device supports the write-back cache and fua and rnbd-client recevives it and set the device queue accordingly. Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com> [jwang: some minor change, rename a few varables, remove unrelated comments.] Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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