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authorDave Jiang <dave.jiang@intel.com>2018-03-02 19:31:40 -0800
committerDan Williams <dan.j.williams@intel.com>2018-03-02 19:31:40 -0800
commit5fdf8e5ba5666fe153bd61f851a40078a6347822 (patch)
treebf20c5c1811f57796205c0da20132387698d9925 /drivers/nvdimm
parent94db151dc89262bfa82922c44e8320cea2334667 (diff)
downloadop-kernel-dev-5fdf8e5ba5666fe153bd61f851a40078a6347822.zip
op-kernel-dev-5fdf8e5ba5666fe153bd61f851a40078a6347822.tar.gz
libnvdimm: re-enable deep flush for pmem devices via fsync()
Re-enable deep flush so that users always have a way to be sure that a write makes it all the way out to media. Writes from the PMEM driver always arrive at the NVDIMM since movnt is used to bypass the cache, and the driver relies on the ADR (Asynchronous DRAM Refresh) mechanism to flush write buffers on power failure. The Deep Flush mechanism is there to explicitly write buffers to protect against (rare) ADR failure. This change prevents a regression in deep flush behavior so that applications can continue to depend on fsync() as a mechanism to trigger deep flush in the filesystem-DAX case. Fixes: 06e8ccdab15f4 ("acpi: nfit: Add support for detect platform CPU cache...") Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/pmem.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 10041ac..06f8dcc 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -335,8 +335,7 @@ static int pmem_attach_disk(struct device *dev,
dev_warn(dev, "unable to guarantee persistence of writes\n");
fua = 0;
}
- wbc = nvdimm_has_cache(nd_region) &&
- !test_bit(ND_REGION_PERSIST_CACHE, &nd_region->flags);
+ wbc = nvdimm_has_cache(nd_region);
if (!devm_request_mem_region(dev, res->start, resource_size(res),
dev_name(&ndns->dev))) {
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