On 09/03/2016 04:35, Fam Zheng wrote:
>> > enum BdrvTrackedRequestType {
>> > BDRV_TRACKED_READ,
>> > BDRV_TRACKED_WRITE,
>> > - BDRV_TRACKED_FLUSH,
>> > - BDRV_TRACKED_IOCTL,
>> > BDRV_TRACKED_DISCARD,
> Okay, so flush and ioctl are not needed, but why is discard different?Discard can modify the contents of the device, so I think it's safer to serialize it against RMW and copy-on-read operations. Paolo
