[PATCH 02/30] block: add a bdev_nr_bytes helper

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Add a helper to query the size of a block device in bytes.  This
will be used to remove open coded access to ->bd_inode.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
 include/linux/genhd.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 082a3e5fd8fa1..b560aee1d69f0 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -235,9 +235,14 @@ static inline sector_t get_start_sect(struct block_device *bdev)
 	return bdev->bd_start_sect;
+static inline loff_t bdev_nr_bytes(struct block_device *bdev)
+	return i_size_read(bdev->bd_inode);
 static inline sector_t bdev_nr_sectors(struct block_device *bdev)
-	return i_size_read(bdev->bd_inode) >> 9;
+	return bdev_nr_bytes(bdev) >> SECTOR_SHIFT;
 static inline sector_t get_capacity(struct gendisk *disk)

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