Commit fa7d2e63 authored Jan 24, 2019 by Dan Williams

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: 004f1afb ("libnvdimm, pmem: direct map legacy pmem by default")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

parent 11a35810

drivers/nvdimm/namespace_devs.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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,