linux-kernel - Re: [PATCH 06/11] VFS: unify old_mnt_idmap and new_mnt

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Message-ID: <20250813043635.GC222315@ZenIV>
Date: Wed, 13 Aug 2025 05:36:35 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: NeilBrown <neil@...wn.name>
Cc: Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	David Howells <dhowells@...hat.com>,
	Marc Dionne <marc.dionne@...istor.com>,
	Xiubo Li <xiubli@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
	Tyler Hicks <code@...icks.com>, Miklos Szeredi <miklos@...redi.hu>,
	Richard Weinberger <richard@....at>,
	Anton Ivanov <anton.ivanov@...bridgegreys.com>,
	Johannes Berg <johannes@...solutions.net>,
	Trond Myklebust <trondmy@...nel.org>,
	Anna Schumaker <anna@...nel.org>,
	Chuck Lever <chuck.lever@...cle.com>,
	Jeff Layton <jlayton@...nel.org>,
	Amir Goldstein <amir73il@...il.com>,
	Steve French <sfrench@...ba.org>,
	Namjae Jeon <linkinjeon@...nel.org>,
	Carlos Maiolino <cem@...nel.org>, linux-fsdevel@...r.kernel.org,
	linux-afs@...ts.infradead.org, netfs@...ts.linux.dev,
	ceph-devel@...r.kernel.org, ecryptfs@...r.kernel.org,
	linux-um@...ts.infradead.org, linux-nfs@...r.kernel.org,
	linux-unionfs@...r.kernel.org, linux-cifs@...r.kernel.org,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/11] VFS: unify old_mnt_idmap and new_mnt_idmap in
 renamedata

On Tue, Aug 12, 2025 at 12:25:09PM +1000, NeilBrown wrote:
> A rename can only rename with a single mount.  Callers of vfs_rename()
> must and do ensure this is the case.
> 
> So there is no point in having two mnt_idmaps in renamedata as they are
> always the same.  Only of of them is passed to ->rename in any case.
> 
> This patch replaces both with a single "mnt_idmap" and changes all
> callers.

Looks sane and IMO should be reordered in front of the queue.