libnvdimm, pfn: 'struct page' provider infrastructure
Implement the base infrastructure for libnvdimm PFN devices. Similar to
BTT devices they take a namespace as a backing device and layer
functionality on top. In this case the functionality is reserving space
for an array of 'struct page' entries to be handed out through
pfn_to_page(). For now this is just the basic libnvdimm-device-model for
configuring the base PFN device.
As the namespace claiming mechanism for PFN devices is mostly identical
to BTT devices drivers/nvdimm/claim.c is created to house the common
bits.
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 1958829..028d2d1 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -731,6 +731,7 @@
static int btt_arena_write_layout(struct arena_info *arena)
{
int ret;
+ u64 sum;
struct btt_sb *super;
struct nd_btt *nd_btt = arena->nd_btt;
const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
@@ -770,7 +771,8 @@
super->info2off = cpu_to_le64(arena->info2off - arena->infooff);
super->flags = 0;
- super->checksum = cpu_to_le64(nd_btt_sb_checksum(super));
+ sum = nd_sb_checksum((struct nd_gen_sb *) super);
+ super->checksum = cpu_to_le64(sum);
ret = btt_info_write(arena, super);
@@ -1422,8 +1424,6 @@
{
int rc;
- BUILD_BUG_ON(sizeof(struct btt_sb) != SZ_4K);
-
btt_major = register_blkdev(0, "btt");
if (btt_major < 0)
return btt_major;