libnvdimm, blk: add support for blk integrity

Support multiple block sizes (sector + metadata) for nd_blk in the
same way as done for the BTT. Add the idea of an 'internal' lbasize,
which is properly aligned and padded, and store metadata in this space.

Signed-off-by: Vishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 1d96b9a6e4cc..4288169432de 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -379,6 +379,9 @@ int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
         };
         int ret;
 
+        if (meta_size == 0)
+                return 0;
+
         ret = blk_integrity_register(disk, &integrity);
         if (ret)
                 return ret;