Commit a4662458 authored by Michal Suchanek's avatar Michal Suchanek Committed by Mike Snitzer

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/87lfk5hahc.fsf@linux.ibm.com/
Fixes: 6e84200c ("virtio-pmem: Add virtio pmem driver")
Signed-off-by: default avatarMichal Suchanek <msuchanek@suse.de>
Acked-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # 5.3+
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 382761dc
...@@ -2266,6 +2266,12 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv) ...@@ -2266,6 +2266,12 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv)
} }
if (WC_MODE_PMEM(wc)) { 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); r = persistent_memory_claim(wc);
if (r) { if (r) {
ti->error = "Unable to map persistent memory for cache"; ti->error = "Unable to map persistent memory for cache";
......
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