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From:   Christoph Hellwig <hch@infradead.org>
To:     Li Nan <linan122@huawei.com>
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Subject: Re: [PATCH -next v2 1/9] blk-iocost: cleanup ioc_qos_write() and
 ioc_cost_model_write()
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> +	ret = nbytes;

ret is an int which bytes is a size_t.  So we at least need a ssize_t
instead for ret, and even that assumes nbytes never overflows a ssize_t.