From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B5C42E83C; Mon, 18 Mar 2024 10:21:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710757288; cv=none; b=Z19cZ0DKJW8AOrYcYw+k3erGHW822g4/yrQdZcZVKnabg+A26ytgk8zPXGc5zyqIt0sD/bK+yuLu8hEsTdj1hL8B9Lv2VeBfeDa0aLS2ja1iaCJ9+V4/up8CrdJholMO1u+zW/8i9XfkBN3725Aqp1NuJRz1QDzmrdYWai/LMwY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710757288; c=relaxed/simple; bh=quW6wJJbe+qS/wQlU5osutwle06DhV07t75zMADz2nY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=fC+OuK3QPHfGrbWHNEZgcyXXpbvSkRbS0Pyl+FeUUH0JE5yfKl3dYhR9wCejjKs/4nVugBsg+74ajJ/ROUKG3b//DapK77lIHSEn+/06EBdAqjU2JLVLcI1u0ElE9gjX5YrgHvGNFiBhhkxSdIpyJ8RuyKp10U9CwqjnleqPduM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YK5ovN+F; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YK5ovN+F" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB0EEC43390; Mon, 18 Mar 2024 10:21:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710757287; bh=quW6wJJbe+qS/wQlU5osutwle06DhV07t75zMADz2nY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=YK5ovN+FEClGv4tZVLB9DIL2QSeIWReKsonx1fgj+f4dU7i17OmFyOiqiXhaajmp9 f+3nhTc/Ogywln+LTf+nAwZpMgVeWxM0E1+Mw13XTh2FsqztWNjYqJ64W2XsjNv5mB KlG4RdSlhDNHlzvBs0CaQvO/DqGua/MbXeckZDymFFry2tl8Iw+wGxKyPLNzmlEKCK HQlzp1u5Uh87cIYNIEQp6RXGr5KMIzcYMr1bRs4LGiVFyPQ3KfeoIuc08hdX3kdywl ROfhhJ+9p2rYBwrzgX9C/PrAk8FYmb89IwvjcC9c3ern8tatYORcqR9C0MgNoh7kWr vgVqe9WPGAb/w== Message-ID: Subject: Re: [PATCH RFC 06/24] vfs: break parent dir delegations in open(..., O_CREAT) codepath From: Jeff Layton To: Stefan Metzmacher , Alexander Viro , Christian Brauner , Jan Kara , Chuck Lever , Alexander Aring , Trond Myklebust , Anna Schumaker , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Greg Kroah-Hartman , "Rafael J. Wysocki" , David Howells , Tyler Hicks , Neil Brown , Olga Kornievskaia , Dai Ngo , Miklos Szeredi , Amir Goldstein , Namjae Jeon , Sergey Senozhatsky , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: 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: Mon, 18 Mar 2024 06:21:23 -0400 In-Reply-To: <0583f4be-4c34-44de-99f2-891d673b53a9@samba.org> References: <20240315-dir-deleg-v1-0-a1d6209a3654@kernel.org> <20240315-dir-deleg-v1-6-a1d6209a3654@kernel.org> <0583f4be-4c34-44de-99f2-891d673b53a9@samba.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: ecryptfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2024-03-18 at 09:25 +0100, Stefan Metzmacher wrote: > Hi Jeff, >=20 > > In order to add directory delegation support, we need to break > > delegations on the parent whenever there is going to be a change in the > > directory. > >=20 > > Add a delegated_inode parameter to lookup_open and have it break the > > delegation. Then, open_last_lookups can wait for the delegation break > > and retry the call to lookup_open once it's done. > >=20 > > Signed-off-by: Jeff Layton > > --- > > fs/namei.c | 22 ++++++++++++++++++---- > > 1 file changed, 18 insertions(+), 4 deletions(-) > >=20 > > diff --git a/fs/namei.c b/fs/namei.c > > index f00d8d708001..88598a62ec64 100644 > > --- a/fs/namei.c > > +++ b/fs/namei.c > > @@ -3404,7 +3404,7 @@ static struct dentry *atomic_open(struct nameidat= a *nd, struct dentry *dentry, > > */ > > static struct dentry *lookup_open(struct nameidata *nd, struct file *= file, > > const struct open_flags *op, > > - bool got_write) > > + bool got_write, struct inode **delegated_inode) >=20 > Does NFS has a concept of lease keys and parent lease keys? >=20 > In SMB it's possible that the client passes a lease key (16 client chosen= bytes) to a directory open, > when asking for a directory lease. >=20 > Then operations on files within that directory, take that lease key from = the directory as > 'parent lease keys' in addition to a unique lease key for the file. >=20 > That way a client can avoid breaking its own directory leases when creati= ng/move/delete... files > in the directory. >=20 No, it's a bit different with NFSv4 directory delegations. A delegation is given vs a filehandle (which is analogous to an inode), and it gets a stateid, which just uniquely identifies it. There is no real association with the parent. When you request the dir delegation, you can request to be notified when something changes instead of the server recalling it. The server may or may not grant that request. Notifications are not implemented in this patchset as of yet. I'm focusing on getting the recall handling right first, and then I'll plan to add that in a later phase. --=20 Jeff Layton