On Tue, 30 Jun 2020, Michal Suchanek wrote: > The writecache driver does not handle asynchronous pmem. Reject it when > supplied as cache. > > Link: https://lore.kernel.org/linux-nvdimm/87lfk5hahc.fsf@xxxxxxxxxxxxx/ > Fixes: 6e84200c0a29 ("virtio-pmem: Add virtio pmem driver") > > Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx> > --- > drivers/md/dm-writecache.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c > index 30505d70f423..57b0a972f6fd 100644 > --- a/drivers/md/dm-writecache.c > +++ b/drivers/md/dm-writecache.c > @@ -2277,6 +2277,12 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv) > > wc->memory_map_size -= (uint64_t)wc->start_sector << SECTOR_SHIFT; > > + if (!dax_synchronous(wc->ssd_dev->dax_dev)) { > + r = -EOPNOTSUPP; > + ti->error = "Asynchronous persistent memory not supported as pmem cache"; > + goto bad; > + } > + > bio_list_init(&wc->flush_list); > wc->flush_thread = kthread_create(writecache_flush_thread, wc, "dm_writecache_flush"); > if (IS_ERR(wc->flush_thread)) { > -- Hi Shouldn't this be in the "if (WC_MODE_PMEM(wc))" block? WC_MODE_PMEM(wc) retrurns true if we are using persistent memory as a cache device, otherwise we are using generic block device as a cache device. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
