On 14/08/17 23:04, Shaohua Li wrote: > From: Shaohua Li <shli@xxxxxx> > > Software must flush disk cache to guarantee data safety. To check if > software correctly does disk cache flush, we must know the behavior of > disk. But physical disk behavior is uncontrollable. Even software > doesn't do the flush, the disk probably does the flush. This patch tries > to emulate a cache in the test disk. > > All write will go to a cache first, when the cache is full, we then > flush some data to disk storage. A flush request will flush all data of > the cache to disk storage. A FUA write will write to memory store > directly and revalidate data in cache. If there is a power failure (by > writing to power attribute, 'echo 0 > disk_name/power'), we discard all > data in the cache, but preserve the data in disk storage. Later we can > power on the disk again as usual (write 1 to 'power' attribute), then we > can check data integrity and very if software does everything correctly. > > A new attritue 'cache_size' (in MB) is added to configure cache size. c/attritue/attribute/ Cheers, Wol
