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libnvdimm, btt: write and validate parent_uuid

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When a BTT is instantiated on a namespace it must validate the namespace
uuid matches the 'parent_uuid' stored in the btt superblock. This
property enforces that changing the namespace UUID invalidates all
former BTT instances on that storage. For "IO namespaces" that don't
have a label or UUID, the parent_uuid is set to zero, and this
validation is skipped. For such cases, old BTTs have to be invalidated
by forcing the namespace to raw mode, and overwriting the BTT info
blocks.

Based on a patch by Dan Williams <dan.j.williams@intel.com>

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vishal Verma
2015-07-29 14:58:09 -06:00
committed by Dan Williams
parent ab45e76327
commit 6ec689542b
4 changed files with 37 additions and 1 deletions
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20
drivers/nvdimm/namespace_devs.c
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@@ -100,6 +100,26 @@ const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
}
EXPORT_SYMBOL(nvdimm_namespace_disk_name);
const u8 *nd_dev_to_uuid(struct device *dev)
{
static const u8 null_uuid[16];
if (!dev)
return null_uuid;
if (is_namespace_pmem(dev)) {
struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
return nspm->uuid;
} else if (is_namespace_blk(dev)) {
struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
return nsblk->uuid;
} else
return null_uuid;
}
EXPORT_SYMBOL(nd_dev_to_uuid);
static ssize_t nstype_show(struct device *dev,
struct device_attribute *attr, char *buf)
{