ubifs: rename_whiteout: correct old_dir size computing

hulk inclusion
category: bugfix
bugzilla: 186191, https://gitee.com/openeuler/kernel/issues/I4U4SQ
CVE: NA

--------------------------------

When renaming the whiteout file, the old whiteout file is not deleted.
Therefore, we add the old dentry size to the old dir like XFS.
Otherwise, an error may be reported due to `fscki->calc_sz != fscki->size`
in check_indes.

Fixes: 9e0a1fff ("ubifs: Implement RENAME_WHITEOUT")
Reported-by: NZhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: NBaokun Li <libaokun1@huawei.com>
Reviewed-by: NZhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: NZhang Yi <yi.zhang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

fs/ubifs/dir.c

@@ -1400,6 +1400,9 @@ static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
 			iput(whiteout);
 			goto out_release;
 		}
+
+		/* Add the old_dentry size to the old_dir size. */
+		old_sz -= CALC_DENT_SIZE(fname_len(&old_nm));
 	}
 
 	lock_4_inodes(old_dir, new_dir, new_inode, whiteout);