dm writecache: reject asynchronous pmem devices

DM writecache does not handle asynchronous pmem. Reject it when
supplied as cache.

Link: https://lore.kernel.org/linux-nvdimm/[email protected]/
Fixes: 6e84200 ("virtio-pmem: Add virtio pmem driver")
Signed-off-by: Michal Suchanek <[email protected]>
Acked-by: Mikulas Patocka <[email protected]>
Cc: [email protected] # 5.3+
Signed-off-by: Mike Snitzer <[email protected]>

Author: hramrach

drivers/md/dm-writecache.c

@@ -2266,6 +2266,12 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv)
 	}
 
 	if (WC_MODE_PMEM(wc)) {
+		if (!dax_synchronous(wc->ssd_dev->dax_dev)) {
+			r = -EOPNOTSUPP;
+			ti->error = "Asynchronous persistent memory not supported as pmem cache";
+			goto bad;
+		}
+
 		r = persistent_memory_claim(wc);
 		if (r) {
 			ti->error = "Unable to map persistent memory for cache";