linux-kernel - Re: [PATCH v4 10/14] VFS/ovl/smb: introduce start_renaming

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Message-ID: <CAKYAXd8QGx=GWNCw8n3Pfp-4VDOY6OTtnHvGjcvAAHESH-eLyA@mail.gmail.com>
Date: Thu, 30 Oct 2025 09:02:09 +0900
From: Namjae Jeon <linkinjeon@...nel.org>
To: NeilBrown <neil@...wn.name>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, 
	Amir Goldstein <amir73il@...il.com>, Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org, 
	Jeff Layton <jlayton@...nel.org>, Chris Mason <clm@...com>, David Sterba <dsterba@...e.com>, 
	David Howells <dhowells@...hat.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, Tyler Hicks <code@...icks.com>, 
	Miklos Szeredi <miklos@...redi.hu>, Chuck Lever <chuck.lever@...cle.com>, 
	Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
	Steve French <smfrench@...il.com>, Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Carlos Maiolino <cem@...nel.org>, John Johansen <john.johansen@...onical.com>, 
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>, 
	"Serge E. Hallyn" <serge@...lyn.com>, Stephen Smalley <stephen.smalley.work@...il.com>, 
	Ondrej Mosnacek <omosnace@...hat.com>, Mateusz Guzik <mjguzik@...il.com>, 
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Stefan Berger <stefanb@...ux.ibm.com>, 
	"Darrick J. Wong" <djwong@...nel.org>, linux-kernel@...r.kernel.org, netfs@...ts.linux.dev, 
	ecryptfs@...r.kernel.org, linux-nfs@...r.kernel.org, 
	linux-unionfs@...r.kernel.org, linux-cifs@...r.kernel.org, 
	linux-xfs@...r.kernel.org, apparmor@...ts.ubuntu.com, 
	linux-security-module@...r.kernel.org, selinux@...r.kernel.org
Subject: Re: [PATCH v4 10/14] VFS/ovl/smb: introduce start_renaming_dentry()

On Thu, Oct 30, 2025 at 8:46 AM NeilBrown <neilb@...mail.net> wrote:
>
> From: NeilBrown <neil@...wn.name>
>
> Several callers perform a rename on a dentry they already have, and only
> require lookup for the target name.  This includes smb/server and a few
> different places in overlayfs.
>
> start_renaming_dentry() performs the required lookup and takes the
> required lock using lock_rename_child()
>
> It is used in three places in overlayfs and in ksmbd_vfs_rename().
>
> In the ksmbd case, the parent of the source is not important - the
> source must be renamed from wherever it is.  So start_renaming_dentry()
> allows rd->old_parent to be NULL and only checks it if it is non-NULL.
> On success rd->old_parent will be the parent of old_dentry with an extra
> reference taken.  Other start_renaming function also now take the extra
> reference and end_renaming() now drops this reference as well.
>
> ovl_lookup_temp(), ovl_parent_lock(), and ovl_parent_unlock() are
> all removed as they are no longer needed.
>
> OVL_TEMPNAME_SIZE and ovl_tempname() are now declared in overlayfs.h so
> that ovl_check_rename_whiteout() can access them.
>
> ovl_copy_up_workdir() now always cleans up on error.
>
> Reviewed-by: Amir Goldstein <amir73il@...il.com>
> Signed-off-by: NeilBrown <neil@...wn.name>
For ksmbd part,
Reviewed-by: Namjae Jeon <linkinjeon@...nel.org>
Thanks!