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libnvdimm, namespace: filter out of range labels in scan_labels()

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Short-circuit doomed-to-fail label validation attempts by skipping
labels that are outside the given region.  For example a DIMM that has
multiple PMEM regions will waste time attempting to create namespaces
only to find that the interleave-set-cookie does not validate, e.g.:

    nd_region region6: invalid cookie in label: 73e608dc-47b9-4b2a-b5c7-2d55a32e0c2

Similar to how we skip BLK labels when performing PMEM validation we can
skip out-of-range labels early.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2016-10-05 15:54:46 -07:00
parent 762d067dba
commit c969e24c1b
1 changed files with 7 additions and 2 deletions
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9
drivers/nvdimm/namespace_devs.c
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@ -2013,10 +2013,11 @@ static int cmp_dpa(const void *a, const void *b)
static struct device **scan_labels(struct nd_region *nd_region)
{
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
int i, count = 0;
struct device *dev, **devs = NULL;
struct nd_label_ent *label_ent, *e;
int i, count = 0;
struct nd_mapping *nd_mapping = &nd_region->mapping[0];
resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
/* "safe" because create_namespace_pmem() might list_move() label_ent */
list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
@ -2033,6 +2034,10 @@ static struct device **scan_labels(struct nd_region *nd_region)
else
continue;
/* skip labels that describe extents outside of the region */
if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
continue;
i = add_namespace_resource(nd_region, nd_label, devs, count);
if (i < 0)
goto err;