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authorDan Williams <dan.j.williams@intel.com>2015-12-12 16:09:14 -0800
committerDan Williams <dan.j.williams@intel.com>2015-12-13 11:40:20 -0800
commita34d5e8a6ad1a31b186019c9c351777626698863 (patch)
tree8ca570f659c71e0118486dda5249d5cf7908bdc0 /drivers/nvdimm/pfn_devs.c
parent315c562536c42aa4da9b6c5a2135dd6715a5e0b5 (diff)
downloadlinux-a34d5e8a6ad1a31b186019c9c351777626698863.tar.bz2
libnvdimm, pfn: add parent uuid validation
Track and check the uuid of the namespace hosting a pfn instance. This forces the pfn info block to be invalidated if the namespace is re-configured with a different uuid. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/pfn_devs.c')
-rw-r--r--drivers/nvdimm/pfn_devs.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 95ecd7b0fab3..f9b674bc49db 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -273,10 +273,11 @@ struct device *nd_pfn_create(struct nd_region *nd_region)
int nd_pfn_validate(struct nd_pfn *nd_pfn)
{
- struct nd_namespace_common *ndns = nd_pfn->ndns;
- struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
- struct nd_namespace_io *nsio;
u64 checksum, offset;
+ struct nd_namespace_io *nsio;
+ struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
+ struct nd_namespace_common *ndns = nd_pfn->ndns;
+ const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev);
if (!pfn_sb || !ndns)
return -ENODEV;
@@ -296,6 +297,9 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
return -ENODEV;
pfn_sb->checksum = cpu_to_le64(checksum);
+ if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
+ return -ENODEV;
+
switch (le32_to_cpu(pfn_sb->mode)) {
case PFN_MODE_RAM:
break;