jfs: atomically read inode size

See i_size_read() comments in include/linux/fs.h

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 2be7c9c..51881eb8 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -283,7 +283,7 @@
 		}
 		case Opt_resize_nosize:
 		{
-			*newLVSize = sb->s_bdev->bd_inode->i_size >>
+			*newLVSize = i_size_read(sb->s_bdev->bd_inode) >>
 				sb->s_blocksize_bits;
 			if (*newLVSize == 0)
 				pr_err("JFS: Cannot determine volume size\n");
@@ -549,7 +549,7 @@
 		goto out_unload;
 	}
 	inode->i_ino = 0;
-	inode->i_size = sb->s_bdev->bd_inode->i_size;
+	inode->i_size = i_size_read(sb->s_bdev->bd_inode);
 	inode->i_mapping->a_ops = &jfs_metapage_aops;
 	hlist_add_fake(&inode->i_hash);
 	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);