dm writecache: reject asynchronous pmem devices
commit5.4-rM2-2.2.x-imx-squasheda466245803
upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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49a7ac29f6
commit
299ffecbd5
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@ -2104,6 +2104,12 @@ invalid_optional:
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}
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if (WC_MODE_PMEM(wc)) {
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if (!dax_synchronous(wc->ssd_dev->dax_dev)) {
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r = -EOPNOTSUPP;
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ti->error = "Asynchronous persistent memory not supported as pmem cache";
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goto bad;
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}
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r = persistent_memory_claim(wc);
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if (r) {
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ti->error = "Unable to map persistent memory for cache";
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