linux-kernel - Re: [PATCH RFC 08/24] vfs: make vfs_mknod break delegations on parent directory

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Date: Fri, 22 Mar 2024 15:13:49 +0100
From: Christian Brauner <brauner@...nel.org>
To: Jeff Layton <jlayton@...nel.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
	Chuck Lever <chuck.lever@...cle.com>, Alexander Aring <alex.aring@...il.com>, 
	Trond Myklebust <trond.myklebust@...merspace.com>, Anna Schumaker <anna@...nel.org>, 
	Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@...guebit.com>, 
	Ronnie Sahlberg <ronniesahlberg@...il.com>, Shyam Prasad N <sprasad@...rosoft.com>, 
	Tom Talpey <tom@...pey.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, David Howells <dhowells@...hat.com>, 
	Tyler Hicks <code@...icks.com>, Neil Brown <neilb@...e.de>, Olga Kornievskaia <kolga@...app.com>, 
	Dai Ngo <Dai.Ngo@...cle.com>, Miklos Szeredi <miklos@...redi.hu>, 
	Amir Goldstein <amir73il@...il.com>, Namjae Jeon <linkinjeon@...nel.org>, 
	Sergey Senozhatsky <senozhatsky@...omium.org>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org, 
	netfs@...ts.linux.dev, ecryptfs@...r.kernel.org, linux-unionfs@...r.kernel.org, 
	netdev@...r.kernel.org
Subject: Re: [PATCH RFC 08/24] vfs: make vfs_mknod break delegations on
 parent directory

On Wed, Mar 20, 2024 at 04:12:29PM -0400, Jeff Layton wrote:
> On Wed, 2024-03-20 at 14:42 +0100, Christian Brauner wrote:
> > >  int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
> > > -              umode_t, dev_t);
> > > +              umode_t, dev_t, struct inode **);
> > 
> > So we will have at least the following helpers with an additional
> > delegated inode argument.
> > 
> > vfs_unlink()
> > vfs_link()
> > notify_change()
> > vfs_create()
> > vfs_mknod()
> > vfs_mkdir()
> > vfs_rmdir()
> > 
> > From looking at callers all these helpers will be called with non-NULL
> > delegated inode argument in vfs only. Unless it is generally conceivable
> > that other callers will want to pass a non-NULL inode argument over time
> > it might make more sense to add vfs_<operation>_delegated() or
> > __vfs_<operation>() and make vfs_mknod() and friends exported wrappers
> > around it.
> > 
> > I mean it's a matter of preference ultimately but this seems cleaner to
> > me. So at least for the new ones we should consider it. Would also make
> > the patch smaller.
> > 
> 
> Good suggestion. I just respun along those lines and it's a lot cleaner.
> I'm still testing it but here is the new diffstat. It's a little larger
> actually, but it keeps the changes more confined to namei.c:

Sounds good to me!