| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 104/109] dm writecache: reject asynchronous pmem devices | Date | Tue, 14 Jul 2020 20:44:47 +0200 |
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From: Michal Suchanek <msuchanek@suse.de>
commit a46624580376a3a0beb218d94cbc7f258696e29f 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: 6e84200c0a29 ("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>
--- drivers/md/dm-writecache.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -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";
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