Hi T.Kohada, > > exfat_clear_volume_dirty() is only called in sync or umount context. > > In sync or umount context, all requests will be issued with REQ_SYNC > > regardless of whether REQ_SYNC is set when submitting buffer. > > > > And since the request of set VolumeDirty is issued with REQ_SYNC. So > > for simplicity, call sync_dirty_buffer() unconditionally. > > REQ_FUA and REQ_PREFLUSH may not make much sense on SD cards or USB > sticks. > However, the behavior of SCSI/ATAPI type devices with lazy write cache is > - Issue the SYNCHRONIZE_CACHE command to write all the data to the > medium. > - Issue a WRITE command with FORCE_UNIT_ACCESS (device does not use > write cache) for the boot sector. > This guarantees a strict write order. Thank you for your detailed explanation. I will update my patch. Best Regards, Yuezhang Mo
