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dm writecache: reject asynchronous pmem devices

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commit a46624580376a3a0beb218d94cbc7f258696e29f upstream.

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

Link: https://lore.kernel.org/linux-nvdimm/[email protected]/
Fixes: 6e84200c0a ("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]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Michal Suchanek 2020-06-30 17:49:24 +02:00 • committed by Greg Kroah-Hartman
commit 299ffecbd5
1 changed files with 6 additions and 0 deletions
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6
drivers/md/dm-writecache.c
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@ -2104,6 +2104,12 @@ invalid_optional:
}
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";