nvdimm: Split label init out from the logic for getting config data

[linux.git] / drivers / nvdimm / label.c

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 43bad0d5bdb619bf933c2304c4c2cdf2e965f4b4..563f24af01b54bfbeee63233536541f4ae16bf2b 100644 (file)
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -417,6 +417,44 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
        return 0;
 }
 
+int nd_label_data_init(struct nvdimm_drvdata *ndd)
+{
+       size_t config_size, read_size;
+       int rc = 0;
+
+       if (ndd->data)
+               return 0;
+
+       if (ndd->nsarea.status || ndd->nsarea.max_xfer == 0) {
+               dev_dbg(ndd->dev, "failed to init config data area: (%u:%u)\n",
+                       ndd->nsarea.max_xfer, ndd->nsarea.config_size);
+               return -ENXIO;
+       }
+
+       /*
+        * We need to determine the maximum index area as this is the section
+        * we must read and validate before we can start processing labels.
+        *
+        * If the area is too small to contain the two indexes and 2 labels
+        * then we abort.
+        *
+        * Start at a label size of 128 as this should result in the largest
+        * possible namespace index size.
+        */
+       ndd->nslabel_size = 128;
+       read_size = sizeof_namespace_index(ndd) * 2;
+       if (!read_size)
+               return -ENXIO;
+
+       /* Allocate config data */
+       config_size = ndd->nsarea.config_size;
+       ndd->data = kvzalloc(config_size, GFP_KERNEL);
+       if (!ndd->data)
+               return -ENOMEM;
+
+       return nvdimm_get_config_data(ndd, ndd->data, 0, config_size);
+}
+
 int nd_label_active_count(struct nvdimm_drvdata *ndd)
 {
        struct nd_namespace_index *nsindex;