NVMe: Abstract out sector to block number conversion

Introduce nvme_block_nr() to help convert sectors to block numbers.
This fixes an integer overflow in the SCSI conversion layer, and it's
slightly less typing than opencoding it.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Acked-by: Keith Busch <keith.busch@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index aa575033dbe7..09f419d4da4e 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -566,6 +566,11 @@ struct nvme_iod {
         struct scatterlist sg[0];
 };
 
+static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
+{
+        return (sector >> (ns->lba_shift - 9));
+}
+
 /**
  * nvme_free_iod - frees an nvme_iod
  * @dev: The device that the I/O was submitted to