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 8B64514D283; Tue, 14 Oct 2025 11:10:23 +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=1760440223; cv=none; b=h5a3yEHj/Bh8peTe4WUmXLBPQxM+47fsj34AXqoMxBXeN9YtlZXwB0NdBzEN3iAsHXacXjVyroBMvILu872xB5/vXISDmo2l/5ygyhIjjCJRQ0m7d6KgTzNQCBKNmhEVUVLYVnBh7ax8nHHlafGGRetDi+Lhled4Tw6S6XBBpAI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760440223; c=relaxed/simple; bh=FxsWH1qQqr9tMu/ZDDvTLyHxH+dQhP5inA3jQqoIGE0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=kNu4xnpFHti3IGiM5T7WLbCnDcxuJM6yusK1HeMyudfZMR/sJYOEUu8nmndaDsd/esmkCvZ5EBev3LzMg/6I7eQMyWGNx/IujXMxFnrI2woDLgpCuvEEiglv7UVoirEBjm7eK8nvVKpb1anpqcKjBibE4/kwlAnAA/cbURuMXYg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jl0ztH3W; 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="jl0ztH3W" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD067C4CEE7; Tue, 14 Oct 2025 11:10:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760440223; bh=FxsWH1qQqr9tMu/ZDDvTLyHxH+dQhP5inA3jQqoIGE0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=jl0ztH3W7FfhuFAWXE/8q/fcCaWnwWixrSL7iC68ifyZesAUBr9pbvOOGxbwUpvGJ Ed1W3E5XttQjINgtt1N7I/1vCRYWeqQXwQJL4AhCg01V0DnipIBqCywG8J7sZRhVem jm0GdUwvxpEEvGZ7U+j0wTnszxbVc9V80DFasZLEYGqra6n/JAJLqRkQH66OTkdeB6 HjgIGemuz2CIweqhSe5BZjsti8e8DVpqsLJyQQ2Xe3PpUp412EReK+VNcGG8ctfNbG ZoTx5Ciz0t7FBs0tmt8107KND16Hk8I0xz6wWU9Q3G5ArE1+kw1koRKQi/Z8T0qXPz JyrNoTn5h6NEA== Message-ID: <87a320441f2b568c71649a7e6e99381b1dba6a8e.camel@kernel.org> Subject: Re: [PATCH 02/13] filelock: add a lm_may_setlease lease_manager callback From: Jeff Layton To: NeilBrown Cc: Miklos Szeredi , 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 , Bharath SM , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , David Howells , Tyler Hicks , Olga Kornievskaia , Dai Ngo , Amir Goldstein , Namjae Jeon , Steve French , Sergey Senozhatsky , Carlos Maiolino , Kuniyuki Iwashima , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , 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, linux-xfs@vger.kernel.org, netdev@vger.kernel.org Date: Tue, 14 Oct 2025 07:10:18 -0400 In-Reply-To: <176042008301.1793333.506325387242251221@noble.neil.brown.name> References: <20251013-dir-deleg-ro-v1-0-406780a70e5e@kernel.org> , <20251013-dir-deleg-ro-v1-2-406780a70e5e@kernel.org> <176042008301.1793333.506325387242251221@noble.neil.brown.name> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Tue, 2025-10-14 at 16:34 +1100, NeilBrown wrote: > On Tue, 14 Oct 2025, Jeff Layton wrote: > > The NFSv4.1 protocol adds support for directory delegations, but it > > specifies that if you already have a delegation and try to request a ne= w > > one on the same filehandle, the server must reply that the delegation i= s > > unavailable. > >=20 > > Add a new lease manager callback to allow the lease manager (nfsd in > > this case) to impose this extra check when performing a setlease. > >=20 > > Signed-off-by: Jeff Layton > > --- > > fs/locks.c | 5 +++++ > > include/linux/filelock.h | 14 ++++++++++++++ > > 2 files changed, 19 insertions(+) > >=20 > > diff --git a/fs/locks.c b/fs/locks.c > > index 0b16921fb52e602ea2e0c3de39d9d772af98ba7d..9e366b13674538dbf482ffd= eee92fc717733ee20 100644 > > --- a/fs/locks.c > > +++ b/fs/locks.c > > @@ -1826,6 +1826,11 @@ generic_add_lease(struct file *filp, int arg, st= ruct file_lease **flp, void **pr > > continue; > > } > > =20 > > + /* Allow the lease manager to veto the setlease */ > > + if (lease->fl_lmops->lm_may_setlease && > > + !lease->fl_lmops->lm_may_setlease(lease, fl)) > > + goto out; > > + >=20 > I don't see any locking around this. What if the condition which > triggers a veto happens after this check, and before the lm_change > below? > Should lm_change implement the veto? Return -EAGAIN? >=20 >=20 The flc_lock is held over this check and any subsequent lease addition. Is that not sufficient? > > /* > > * No exclusive leases if someone else has a lease on > > * this file: > > diff --git a/include/linux/filelock.h b/include/linux/filelock.h > > index c2ce8ba05d068b451ecf8f513b7e532819a29944..70079beddf61aa32ef01f11= 14cf0cb3ffaf2131a 100644 > > --- a/include/linux/filelock.h > > +++ b/include/linux/filelock.h > > @@ -49,6 +49,20 @@ struct lease_manager_operations { > > int (*lm_change)(struct file_lease *, int, struct list_head *); > > void (*lm_setup)(struct file_lease *, void **); > > bool (*lm_breaker_owns_lease)(struct file_lease *); > > + > > + /** > > + * lm_may_setlease - extra conditions for setlease > > + * @new: new file_lease being set > > + * @old: old (extant) file_lease > > + * > > + * This allows the lease manager to add extra conditions when > > + * setting a lease, based on the presence of an existing lease. > > + * > > + * Return values: > > + * %false: @new and @old conflict > > + * %true: No conflict detected > > + */ > > + bool (*lm_may_setlease)(struct file_lease *new, struct file_lease *ol= d); > > }; > > =20 > > struct lock_manager { > >=20 > > --=20 > > 2.51.0 > >=20 > >=20 --=20 Jeff Layton