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when the nbuckets of cache device is smaller than 1024, making cache device will trigger BUG_ON in kernel, add a condition to avoid this. Reported-by: nitroxis <n@nxs.re> Signed-off-by: Dongbo Cao <cdbdyx@163.com> Signed-off-by: Coly Li <colyli@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>