On Tue, May 02, 2023 at 11:29:22AM +0200, Christoph Böhmwalder wrote: > struct bio *bio = bio_alloc(device->ldev->backing_bdev, 0, > - REQ_OP_FLUSH | REQ_PREFLUSH, GFP_NOIO); > + REQ_OP_FLUSH, GFP_NOIO); This isn't going to work. flush bios are (somewhat confusingly) implemented as writes with no data and the preflush flag. So this should be: REQ_OP_WRITE | REQ_PREFLUSH. and it looks like whatever flushing this does hasn't wroked for a long time.
