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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: 6e84200c0a ("virtio-pmem: Add virtio pmem driver")
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # 5.3+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Michal Suchanek 2020-06-30 17:49:24 +02:00 committed by Mike Snitzer
parent 382761dc63
commit a466245803
1 changed files with 6 additions and 0 deletions
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6
drivers/md/dm-writecache.c
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@ -2266,6 +2266,12 @@ invalid_optional:
} }
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";