linux-kernel - [PATCH 5.16 0916/1017] ubifs: rename_whiteout: correct old

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Date:   Tue,  5 Apr 2022 09:30:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhihao Cheng <chengzhihao1@...wei.com>,
        Baokun Li <libaokun1@...wei.com>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 5.16 0916/1017] ubifs: rename_whiteout: correct old_dir size computing

From: Baokun Li <libaokun1@...wei.com>

commit 705757274599e2e064dd3054aabc74e8af31a095 upstream.

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: 9e0a1fff8db56ea ("ubifs: Implement RENAME_WHITEOUT")
Reported-by: Zhihao Cheng <chengzhihao1@...wei.com>
Signed-off-by: Baokun Li <libaokun1@...wei.com>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ubifs/dir.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -1402,6 +1402,9 @@ static int do_rename(struct inode *old_d
 			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);