linux-kernel - Re: [PATCH 18/26] ovl: avoid pointless cred reference count bump

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Message-ID: <CAOQ4uxhmzShcqBjY-HhHH7JhSpxJ9BVGe1H6C3w-=FcH_fUJQg@mail.gmail.com>
Date: Sun, 24 Nov 2024 15:59:40 +0100
From: Amir Goldstein <amir73il@...il.com>
To: Christian Brauner <brauner@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Miklos Szeredi <miklos@...redi.hu>, 
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 18/26] ovl: avoid pointless cred reference count bump

On Sun, Nov 24, 2024 at 2:44 PM Christian Brauner <brauner@...nel.org> wrote:
>
> No need for the extra reference count bump.
>
> Signed-off-by: Christian Brauner <brauner@...nel.org>
> ---
>  fs/overlayfs/copy_up.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
> index 439bd9a5ceecc4d2f4dc5dfda7cea14c3d9411ba..39f08531abc7e99c32e709a46988939f072a9abe 100644
> --- a/fs/overlayfs/copy_up.c
> +++ b/fs/overlayfs/copy_up.c
> @@ -741,17 +741,15 @@ static int ovl_prep_cu_creds(struct dentry *dentry, struct ovl_cu_creds *cc)
>                 return err;
>
>         if (cc->new)
> -               cc->old = override_creds(get_new_cred(cc->new));
> +               cc->old = override_creds(cc->new);
>
>         return 0;
>  }
>
>  static void ovl_revert_cu_creds(struct ovl_cu_creds *cc)
>  {
> -       if (cc->new) {
> +       if (cc->new)
>                 put_cred(revert_creds(cc->old));
> -               put_cred(cc->new);
> -       }

Same comment here, I think this will read more clearly as
               revert_creds(cc->old));
               put_cred(cc->new);

and better reflects the counterpart of ovl_prep_cu_creds().

Thanks,
Amir.