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| author | Dan Williams <dan.j.williams@intel.com> | 2019-01-24 17:33:06 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-02-12 10:48:14 -0800 |
| commit | fa7d2e639cd90442d868dfc6ca1d4cc9d8bf206e (patch) | |
| tree | 0328b374c2d676b6756d4ae834841f094ab26c6b /drivers/nvdimm | |
| parent | 11a358109e0c48fa74f27e750dde4d25de4d5fc3 (diff) | |
| download | lwn-fa7d2e639cd90442d868dfc6ca1d4cc9d8bf206e.tar.gz lwn-fa7d2e639cd90442d868dfc6ca1d4cc9d8bf206e.zip | |
libnvdimm/pmem: Honor force_raw for legacy pmem regions
For recovery, where non-dax access is needed to a given physical address
range, and testing, allow the 'force_raw' attribute to override the
default establishment of a dev_pagemap.
Otherwise without this capability it is possible to end up with a
namespace that can not be activated due to corrupted info-block, and one
that can not be repaired due to a section collision.
Cc: <stable@vger.kernel.org>
Fixes: 004f1afbe199 ("libnvdimm, pmem: direct map legacy pmem by default")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
| -rw-r--r-- | drivers/nvdimm/namespace_devs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index 4b077555ac70..33a3b23b3db7 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -138,6 +138,7 @@ bool nd_is_uuid_unique(struct device *dev, u8 *uuid) bool pmem_should_map_pages(struct device *dev) { struct nd_region *nd_region = to_nd_region(dev->parent); + struct nd_namespace_common *ndns = to_ndns(dev); struct nd_namespace_io *nsio; if (!IS_ENABLED(CONFIG_ZONE_DEVICE)) @@ -149,6 +150,9 @@ bool pmem_should_map_pages(struct device *dev) if (is_nd_pfn(dev) || is_nd_btt(dev)) return false; + if (ndns->force_raw) + return false; + nsio = to_nd_namespace_io(dev); if (region_intersects(nsio->res.start, resource_size(&nsio->res), IORESOURCE_SYSTEM_RAM, |