squashfs: use bdev_nr_sectors instead of open coding it

Use the proper helper to read the block device size.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 60d6951915f440a4621fc57b73c2b6a2654a2593..e83042ecf0d86755df547adeb225075d19ae83f8 100644 (file)
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -16,6 +16,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/blkdev.h>
 #include <linux/fs.h>
 #include <linux/fs_context.h>
 #include <linux/fs_parser.h>
@@ -179,8 +180,8 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
        /* Check the filesystem does not extend beyond the end of the
           block device */
        msblk->bytes_used = le64_to_cpu(sblk->bytes_used);
-       if (msblk->bytes_used < 0 || msblk->bytes_used >
-                       i_size_read(sb->s_bdev->bd_inode))
+       if (msblk->bytes_used < 0 ||
+           msblk->bytes_used > (bdev_nr_sectors(sb->s_bdev) << SECTOR_SHIFT))
                goto failed_mount;
 
        /* Check block size for sanity */