libnvdimm: namespace indices: read and validate
This on media label format [1] consists of two index blocks followed by
an array of labels. None of these structures are ever updated in place.
A sequence number tracks the current active index and the next one to
write, while labels are written to free slots.
+------------+
| |
| nsindex0 |
| |
+------------+
| |
| nsindex1 |
| |
+------------+
| label0 |
+------------+
| label1 |
+------------+
| |
....nslot...
| |
+------------+
| labelN |
+------------+
After reading valid labels, store the dpa ranges they claim into
per-dimm resource trees.
[1]: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
Cc: Neil Brown <neilb@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index bdf8241..d2ef02e 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -92,8 +92,12 @@
if (ndd->data)
return 0;
- if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0)
+ if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0
+ || ndd->nsarea.config_size < ND_LABEL_MIN_SIZE) {
+ dev_dbg(ndd->dev, "failed to init config data area: (%d:%d)\n",
+ ndd->nsarea.max_xfer, ndd->nsarea.config_size);
return -ENXIO;
+ }
ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
if (!ndd->data)
@@ -243,6 +247,30 @@
}
EXPORT_SYMBOL_GPL(nvdimm_create);
+void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
+{
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
+ kfree(res->name);
+ __release_region(&ndd->dpa, res->start, resource_size(res));
+}
+
+struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
+ struct nd_label_id *label_id, resource_size_t start,
+ resource_size_t n)
+{
+ char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
+ struct resource *res;
+
+ if (!name)
+ return NULL;
+
+ WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
+ res = __request_region(&ndd->dpa, start, n, name, 0);
+ if (!res)
+ kfree(name);
+ return res;
+}
+
static int count_dimms(struct device *dev, void *c)
{
int *count = c;