[PATCH] afs: Fix the nlink handling of dir-over-dir rename

[Marc Dionne]

On Tue, May 25, 2021 at 8:57 AM David Howells <dhowells at redhat.com> wrote:
>
> 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 at redhat.com>
> cc: linux-afs at lists.infradead.org
> ---
>
>  fs/afs/dir.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/afs/dir.c b/fs/afs/dir.c
> index 9fbe5a5ec9bd..78719f2f567e 100644
> --- a/fs/afs/dir.c
> +++ b/fs/afs/dir.c
> @@ -1919,7 +1919,9 @@ static void afs_rename_edit_dir(struct afs_operation *op)
>         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);
>         }

Reviewed-by: Marc Dionne <marc.dionne at auristor.com>

Marc