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 B3124364D6; Mon, 18 Mar 2024 11:07:13 +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=1710760033; cv=none; b=n3nx7uzjHZt4FBmXfCh8nLio5XOgPIZmxoTdYryOa5U0qva/3WSCppLXxu4eIGwUPu3JPBRlD9eh7JZnXZG851acfQOFJ7x7+mZh/yPOaoLvIdb8QJWeLZyNgKwZvSmFptlQKw4M7zDABSk8xQmkPh6sXHMrQA7sNWTkCEN1xyc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710760033; c=relaxed/simple; bh=6qPQr5BehNc/ICqIC3PCIAiNdkcFX+UvDJ8LDqMO3BY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=BK1bLSvCRj0s9q/EQ9GJcLR/R2A/hp30/CmhlL/EAiMoinw/S3vEPaMjwBWL+0zv+iMM9k+T/niSI1HWh0yiC7OWJTrGwrUVbgKzBmloDLLulvvzPHVxgDxSquOGNniFiv12d+mYbnLCrIrh8n7OLTEFqDECNVhszch+N9ZBOjM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BxdhKG/C; 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="BxdhKG/C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35221C43390; Mon, 18 Mar 2024 11:07:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710760033; bh=6qPQr5BehNc/ICqIC3PCIAiNdkcFX+UvDJ8LDqMO3BY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=BxdhKG/C/wXOoASFsJFVF68HuRWx1y6JBbwFqitH4++kowFq9b5ugPI+zE+5lhd+/ 6tgcoI/lQQYijdbCumIsVI/OHDeLtpRUOhXOK7GfYj/QlnqXDcrey1EEsxCOt+Wdsl DU5tt9303GIN1I2cmxFpOAZAYHI7bW7zYrUN+Xjl46xIf8vJ/pm03rzMv8R9GBRSKT twLMCdYNcfbKGOpKmn5O1wmBONghgnnyDRjyrbjNiB20LxfTy3Tg7Ahg7CSX1a/2iL zeeD9xK1ThRLdubf2Dt9Ik3EZfqigRmzm6Q2aYUTq7iOSYYStS3NppUB91Tsvvakrw FWvD9RtCSzi4Q== Message-ID: <2a29648675b743befe59fc13c5ed1440d5cbe9ee.camel@kernel.org> Subject: Re: [PATCH RFC 02/24] filelock: add a lm_set_conflict lease_manager callback From: Jeff Layton To: Chuck Lever Cc: Alexander Viro , Christian Brauner , Jan Kara , 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 , 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 07:07:08 -0400 In-Reply-To: References: <20240315-dir-deleg-v1-0-a1d6209a3654@kernel.org> <20240315-dir-deleg-v1-2-a1d6209a3654@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=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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: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sun, 2024-03-17 at 10:56 -0400, Chuck Lever wrote: > On Fri, Mar 15, 2024 at 12:52:53PM -0400, 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 extra checks when performing a setlease. > >=20 > > Signed-off-by: Jeff Layton > > --- > > fs/locks.c | 5 +++++ > > include/linux/filelock.h | 10 ++++++++++ > > 2 files changed, 15 insertions(+) > >=20 > > diff --git a/fs/locks.c b/fs/locks.c > > index cb4b35d26162..415cca8e9565 100644 > > --- a/fs/locks.c > > +++ b/fs/locks.c > > @@ -1822,6 +1822,11 @@ 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_set_conflict && > > + lease->fl_lmops->lm_set_conflict(lease, fl)) > > + goto out; > > + > > /* > > * 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 daee999d05f3..c5fc768087df 100644 > > --- a/include/linux/filelock.h > > +++ b/include/linux/filelock.h > > @@ -49,6 +49,16 @@ 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_set_conflict - 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. >=20 > To make it clear which return value causes add_lease() to abort, I'd > rather see API contract-style descriptions of the meaning of the > return values instead of this design note. Something like: >=20 > * Return values: > * %true: @new and @old conflict > * %false: No conflict detected >=20 >=20 Thanks. I added this to the patch in my tree. > > + */ > > + bool (*lm_set_conflict)(struct file_lease *new, struct file_lease *ol= d); > > }; > > =20 > > struct lock_manager { > >=20 > > --=20 > > 2.44.0 > >=20 >=20 --=20 Jeff Layton