# \[PATCH 13/30\] cramfs: use bdev\_nr\_bytes instead of open coding it

- From: Christoph Hellwig \<hch@lst.de\>
- Date: 2021-10-15 13:28:53 
- List: linux-ext4
- Page: https://ratatoskr.run/linux-ext4/2021/10/216093
- Thread: https://ratatoskr.run/linux-block/2021/10/216086/t.md

```text
Use the proper helper to read the block device size.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/cramfs/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index 2be65269a987c..666aa380011e0 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -209,7 +209,7 @@ static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset,
 		return read_buffers[i] + blk_offset;
 	}
 
-	devsize = mapping->host->i_size >> PAGE_SHIFT;
+	devsize = bdev_nr_bytes(sb->s_bdev) >> PAGE_SHIFT;
 
 	/* Ok, read in BLKS_PER_BUF pages completely first. */
 	for (i = 0; i < BLKS_PER_BUF; i++) {
-- 
2.30.2

```