[PATCH 25/30] block: add a sb_bdev_nr_blocks helper

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Add a helper to return the size of sb->s_bdev in sb->s_blocksize_bits
based unites.  Note that SECTOR_SHIFT has to be open coded due to
include dependency issues for now, but I have a plan to sort that out

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

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index f67db3c5a04b3..70b4ac47e693c 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -250,6 +250,12 @@ static inline sector_t get_capacity(struct gendisk *disk)
 	return bdev_nr_sectors(disk->part0);
+static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
+	return bdev_nr_sectors(sb->s_bdev) >>
+		(sb->s_blocksize_bits - SECTOR_SHIFT);
 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
 void blk_drop_partitions(struct gendisk *disk);

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