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 29ADB21FF4A; Sun, 19 Oct 2025 14:18:01 +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=1760883482; cv=none; b=EZNw2BONiz5vC6C7e2eLYwMmQC+bKs9HJGQea+NQ/okbl+sjV1VCIQkI474RH/lq3Z8ljU9EhI6l+E3+YWHr4WwtNDdGxT/zB7DjiTWJ+ne+WNlbw7r7lYyd4TKrLALZa5texs+DxHSOWJfrggPau5q1FlRo1J/4Wgj5qZgK3zQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760883482; c=relaxed/simple; bh=vrXYWgR9uRU087VqRnV8tgrLtFPdV6Vnal19D1rVo54=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=QgV43f7IxtFx2Dr9H+AdpPHR5YTRZ6aqlHJOj7rqbuvwFadpQsXqseUD6BCkrgNuL05Rsp8N7eoD5F32aon9meNlDwk8h/g078mR/67k5PgAcrPYL8EI8YOO15t6Zfqmj9gyndiLqMR1JR+uv2NJBtsesmAobQwnQrm4E3ZVtRM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QF1ZKDnx; 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="QF1ZKDnx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2A4A9C4CEF1; Sun, 19 Oct 2025 14:17:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760883481; bh=vrXYWgR9uRU087VqRnV8tgrLtFPdV6Vnal19D1rVo54=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=QF1ZKDnxd73pRqQR7fHMSgXJzLeanlq55VKyJWjm+0STwYP7h3AxYHM6lzRpQCGm1 isRI5p6IR079g/3PRTYsHr3YdqFhD9T8tf25p2XSB+1LHBLGN0I8SgRh3ikY9hjM67 s6Gbd5ULzegNjHzQ1Argu1kgyNceGHfm0/IYG4pux1jWZ7cCvhCaYbAJy05xhA0m5+ ez63bSonpbET7olGhMqeKPdk5Tigs8ec7jz8RyoYsy/90jkEmiieRwGmoCDZEQqWfn SXYA78GLhkz1tzM+ftBtwh5RR6nmD84zHBede93+kklPKu/PCMGPNlXUKPj6apOWkP 9ouqrF99hc9DA== Message-ID: <1e009577aaae1af56dc66dadcfc05caf5d4c6b72.camel@kernel.org> Subject: Re: [PATCH v2 00/11] vfs: recall-only directory delegations for knfsd 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: Sun, 19 Oct 2025 10:17:57 -0400 In-Reply-To: <176074466364.1793333.7771684363912648120@noble.neil.brown.name> References: <20251017-dir-deleg-ro-v2-0-8c8f6dd23c8b@kernel.org> <176074466364.1793333.7771684363912648120@noble.neil.brown.name> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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2tAMJUvFTdDbfe3zKlPDTuVsyNsALBGclPLagJ5ZTP+Vp2irAN9uwBuacBOTtmOdz4ZN2tdvNgozz uxp4CHBDVzAslUi2idy+xpsp47DWPxYFIRP3M8QG/aNW052LaPc0cedYxp8+9eiVUNpxF4SiU4i9J DfX/sn9XcfoVZIxMpCRE750zvJvcCUz9HojsrMQ1NFc7MFT1z3MOW2/RlzPcog7xvR5ENPH19ojRD CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2025-10-18 at 10:44 +1100, NeilBrown wrote: > On Fri, 17 Oct 2025, Jeff Layton wrote: > > A smaller variation of the v1 patchset that I posted earlier this week. > > Neil's review inspired me to get rid of the lm_may_setlease operation > > and to do the conflict resolution internally inside of nfsd. That means > > a smaller VFS-layer change, and an overall reduction in code. > >=20 > > This patchset adds support for directory delegations to nfsd. This > > version only supports recallable delegations. There is no CB_NOTIFY > > support yet. I have patches for those, but we've decided to add that > > support in a later kernel once we get some experience with this part. > > Anna is working on the client-side pieces. > >=20 > > It would be great if we could get into linux-next soon so that it can b= e > > merged for v6.19. Christian, could you pick up the vfs/filelock patches= , > > and Chuck pick up the nfsd patches? > >=20 > > Thanks! > > Jeff > >=20 > > [1]: https://lore.kernel.org/all/20240315-dir-deleg-v1-0-a1d6209a3654@k= ernel.org/ > >=20 > > Signed-off-by: Jeff Layton > > --- > > Changes in v2: > > - handle lease conflict resolution inside of nfsd > > - drop the lm_may_setlease lock_manager operation > > - just add extra argument to vfs_create() instead of creating wrapper > > - don't allocate fsnotify_mark for open directories > > - Link to v1: https://lore.kernel.org/r/20251013-dir-deleg-ro-v1-0-4067= 80a70e5e@kernel.org > >=20 > > --- > > Jeff Layton (11): > > filelock: push the S_ISREG check down to ->setlease handlers > > vfs: add try_break_deleg calls for parents to vfs_{link,rename,un= link} > > vfs: allow mkdir to wait for delegation break on parent > > vfs: allow rmdir to wait for delegation break on parent > > vfs: break parent dir delegations in open(..., O_CREAT) codepath > > vfs: make vfs_create break delegations on parent directory > > vfs: make vfs_mknod break delegations on parent directory > > filelock: lift the ban on directory leases in generic_setlease > > nfsd: allow filecache to hold S_IFDIR files > > nfsd: allow DELEGRETURN on directories > > nfsd: wire up GET_DIR_DELEGATION handling >=20 > vfs_symlink() is missing from the updated APIs. Surely that needs to be > able to wait for a delegation to break. >=20 Ouch! That's a major oversight. I'll fix that up. > vfs_mkobj() maybe does too, but I could easily turn a blind eye to that. >=20 > I haven't looked properly at the last patch but all the other could have > Reviewed-by: NeilBrown >=20 > once the vfs_symlink() omission is fixed. >=20 > NeilBrown Chuck found a couple of potential leaks in there so those will also need to be fixed. As I was writing some xfstests for the VFS pieces, I found another problem too: Currently the F_SETLEASE API sets FL_LEASE leases, but the new delegation breaks that this set adds don't break FL_LEASE leases, since these are FL_DELEG leases. This distinction is mostly due to historical reasons. Leases were added first (for Samba oplocks), but didn't break on metadata changes. When Bruce added delegations, he wanted to ensure that the lease API didn't suddenly change behavior. I see several potential options to fix this: 1/ The simplest is to just make the F_SETLEASE command set FL_DELEG leases when the inode is a directory. That makes for a messy userland interface where files get FL_LEASE objects, but directories get FL_DELEG. I think that will be less useful for userland. 2/ Don't expose this to userland at all (yet?), and just keep returning EINVAL on attempts to set a lease on a directory. The downside there is that this would require us to use nfsd for testing this functionality. Less people will do that than would if it were an xfstest that ran on most local filesystems. I do have some pynfs tests though which could help cover the gap. 3/ Add new F_SETDELEG/F_GETDELEG fcntl() commands. The nice thing about this is that it would also allow us to add a flags field to these commands. The later patches that add CB_NOTIFY support add the ability to ignore certain types of delegation break events. This option would allow us to expose that functionality to userland too. NFS Ganesha and Samba, for example, could make use of this. #3 wouldn't be too difficult (aside from having to update the manpages), so I kind of like that idea. Thoughts? --=20 Jeff Layton