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Message-ID: <ca81387b31025198808df6c55f411b00d74cb047.camel@kernel.org>
Subject: Re: [PATCH RFC 08/24] vfs: make vfs_mknod break delegations on
 parent directory
From: Jeff Layton <jlayton@kernel.org>
To: Christian Brauner <brauner@kernel.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.cz>, Chuck
 Lever <chuck.lever@oracle.com>, Alexander Aring <alex.aring@gmail.com>,
 Trond Myklebust <trond.myklebust@hammerspace.com>, Anna Schumaker
 <anna@kernel.org>, Steve French <sfrench@samba.org>, Paulo Alcantara
 <pc@manguebit.com>, Ronnie Sahlberg <ronniesahlberg@gmail.com>, Shyam
 Prasad N <sprasad@microsoft.com>, Tom Talpey <tom@talpey.com>, Greg
 Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki"
 <rafael@kernel.org>, David Howells <dhowells@redhat.com>, Tyler Hicks
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 <kolga@netapp.com>, Dai Ngo <Dai.Ngo@oracle.com>, Miklos Szeredi
 <miklos@szeredi.hu>, Amir Goldstein <amir73il@gmail.com>, Namjae Jeon
 <linkinjeon@kernel.org>, Sergey Senozhatsky <senozhatsky@chromium.org>, 
 "David S. Miller" <davem@davemloft.net>, Eric Dumazet
 <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni
 <pabeni@redhat.com>, linux-fsdevel@vger.kernel.org,
 linux-kernel@vger.kernel.org,  linux-nfs@vger.kernel.org,
 linux-cifs@vger.kernel.org,  samba-technical@lists.samba.org,
 netfs@lists.linux.dev, ecryptfs@vger.kernel.org, 
 linux-unionfs@vger.kernel.org, netdev@vger.kernel.org
Date: Wed, 20 Mar 2024 16:12:29 -0400
In-Reply-To: <20240320-jaguar-bildband-699e7ef5dc64@brauner>
References: <20240315-dir-deleg-v1-0-a1d6209a3654@kernel.org>
	 <20240315-dir-deleg-v1-8-a1d6209a3654@kernel.org>
	 <20240320-jaguar-bildband-699e7ef5dc64@brauner>
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On Wed, 2024-03-20 at 14:42 +0100, Christian Brauner wrote:
> > =A0int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
> > -              umode_t, dev_t);
> > +              umode_t, dev_t, struct inode **);
>=20
> So we will have at least the following helpers with an additional
> delegated inode argument.
>=20
> vfs_unlink()
> vfs_link()
> notify_change()
> vfs_create()
> vfs_mknod()
> vfs_mkdir()
> vfs_rmdir()
>=20
> 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.
>=20
> 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.
>=20

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:

jlayton@tleilax:~/git/linux$ git diff master --stat
 fs/locks.c                |  12 +++-
 fs/namei.c                | 227 ++++++++++++++++++++++++++++++++++++++++++=
++++--------------------
 fs/nfs/delegation.c       |   5 ++
 fs/nfs/dir.c              |  20 ++++++
 fs/nfs/internal.h         |   2 +-
 fs/nfs/nfs4file.c         |   2 +
 fs/nfs/nfs4proc.c         |  62 +++++++++++++++++-
 fs/nfs/nfs4trace.h        | 104 ++++++++++++++++++++++++++++++
 fs/nfs/nfs4xdr.c          | 136 +++++++++++++++++++++++++++++++++++++++
 fs/nfs/nfstrace.h         |   8 ++-
 fs/nfsd/filecache.c       |  37 +++++++++--
 fs/nfsd/filecache.h       |   2 +
 fs/nfsd/nfs4proc.c        |  48 ++++++++++++++
 fs/nfsd/nfs4state.c       | 113 ++++++++++++++++++++++++++++++++-
 fs/nfsd/nfs4xdr.c         |  91 ++++++++++++++++++++++++++-
 fs/nfsd/state.h           |   5 ++
 fs/nfsd/vfs.c             |   5 +-
 fs/nfsd/vfs.h             |   2 +-
 fs/nfsd/xdr4.h            |  19 ++++++
 fs/smb/client/cifsfs.c    |   3 +
 include/linux/filelock.h  |  14 +++++
 include/linux/nfs4.h      |   7 +++
 include/linux/nfs_fs.h    |   1 +
 include/linux/nfs_fs_sb.h |   1 +
 include/linux/nfs_xdr.h   |   2 +
 25 files changed, 838 insertions(+), 90 deletions(-)

--=20
Jeff Layton <jlayton@kernel.org>