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[02/30] block: add a bdev_nr_bytes helper

Message ID 20211018101130.1838532-3-hch@lst.de (mailing list archive)
State New, archived
Headers show
Series [01/30] block: move the SECTOR_SIZE related definitions to blk_types.h | expand

Commit Message

Christoph Hellwig Oct. 18, 2021, 10:11 a.m. UTC 
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@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 include/linux/genhd.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
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Patch

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)