block: don't warn for flush on read-only device
Don't warn for a flush issued to a read-only device. It's not strictly a writable command, as it doesn't change any on-media data by itself. Reported-by: Stefan Agner <stefan@agner.ch> Fixes: 721c7fc7 ("block: fail op_is_write() requests to read-only partitions") Signed-off-by: Jens Axboe <axboe@kernel.dk>
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