linux-kernel - [PATCH 5.12 153/296] afs: Fix the nlink handling of dir-over-dir rename

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Message-Id: <20210531130709.009434618@linuxfoundation.org>
Date:   Mon, 31 May 2021 15:13:28 +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, David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        linux-afs@...ts.infradead.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.12 153/296] afs: Fix the nlink handling of dir-over-dir rename

From: David Howells <dhowells@...hat.com>

commit f610a5a29c3cfb7d37bdfa4ef52f72ea51f24a76 upstream.

Fix rename of one directory over another such that the nlink on the deleted
directory is cleared to 0 rather than being decremented to 1.

This was causing the generic/035 xfstest to fail.

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
Link: https://lore.kernel.org/r/162194384460.3999479.7605572278074191079.stgit@warthog.procyon.org.uk/ # v1
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/afs/dir.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -1842,7 +1842,9 @@ static void afs_rename_edit_dir(struct a
 	new_inode = d_inode(new_dentry);
 	if (new_inode) {
 		spin_lock(&new_inode->i_lock);
-		if (new_inode->i_nlink > 0)
+		if (S_ISDIR(new_inode->i_mode))
+			clear_nlink(new_inode);
+		else if (new_inode->i_nlink > 0)
 			drop_nlink(new_inode);
 		spin_unlock(&new_inode->i_lock);
 	}