lightnvm: pblk: add helpers for OOB metadata

pblk currently assumes that size of OOB metadata on drive is always
equal to size of pblk_sec_meta struct. This commit add helpers which will
allow to handle different sizes of OOB metadata on drive in the future.

After this patch only OOB metadata equal to 16 bytes is supported.

Reviewed-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 72ad3e70318c..33361bfb85c3 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -405,6 +405,12 @@ static int pblk_core_init(struct pblk *pblk)
                 queue_max_hw_sectors(dev->q) / (geo->csecs >> SECTOR_SHIFT));
         pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
 
+        pblk->oob_meta_size = geo->sos;
+        if (pblk->oob_meta_size != sizeof(struct pblk_sec_meta)) {
+                pblk_err(pblk, "Unsupported metadata size\n");
+                return -EINVAL;
+        }
+
         pblk->pad_dist = kcalloc(pblk->min_write_pgs - 1, sizeof(atomic64_t),
                                                                 GFP_KERNEL);
         if (!pblk->pad_dist)