On 7/12/20 11:47 AM, Coly Li wrote: > For some block devices which large capacity (e.g. 8TB) but small io_opt > size (e.g. 8 sectors), in bcache_device_init() the stripes number calcu- > lated by, > DIV_ROUND_UP_ULL(sectors, d->stripe_size); > might be overflow to the unsigned int bcache_device->nr_stripes. > > This patch uses an unsigned long variable to store DIV_ROUND_UP_ULL() > and after the value is checked to be available in unsigned int range, > sets it to bache_device->nr_stripes. Then the overflow is avoided. Does that work on 32-bit, where sizeof(unsigned long) == 4? -- Jens Axboe
