libnvdimm, label: change min label storage size per UEFI 2.7

UEFI 2.7 defines in page 758 that:

  Initial Label Storage Area Configuration
     :
  The minimum size of the Label Storage Area is large enough to
  hold 2 index blocks and 2 labels.

The mininum index block size is 256 bytes, and the minimum label size
is also 256 bytes.

Change ND_LABEL_MIN_SIZE to (256 * 4) so that NVDIMM devices with
the minimum label storage area do not fail with the size check in
nvdimm_init_config_data().

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index 1ebf4d3..18bbe18 100644 (file)
--- a/drivers/nvdimm/label.h
+++ b/drivers/nvdimm/label.h
@@ -33,7 +33,7 @@ enum {
        BTTINFO_UUID_LEN = 16,
        BTTINFO_FLAG_ERROR = 0x1,    /* error state (read-only) */
        BTTINFO_MAJOR_VERSION = 1,
-       ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
+       ND_LABEL_MIN_SIZE = 256 * 4, /* see sizeof_namespace_index() */
        ND_LABEL_ID_SIZE = 50,
        ND_NSINDEX_INIT = 0x1,
 };