[PATCH 1/2] libnvdimm, label: change min label storage size per UEFI 2.7

From: Toshi Kani
Date: Fri Feb 23 2018 - 16:14:22 EST


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@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/nvdimm/label.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvdimm/label.h b/drivers/nvdimm/label.h
index 1ebf4d3d01ba..18bbe183b3a9 100644
--- 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,
};