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 52384314D06; Thu, 6 Nov 2025 18:01:28 +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=1762452089; cv=none; b=tBTyZR0pq0H8EpUcEdOG0elLGJP7jdK1OE+716kxKlX1W4WG7RpC9vsoG7JqE3zjs97tQUK2XkkseLO1WKII2TWntxbXaARoSt4d8lGCeLU25pikB7HVO0tEqY0ieGDuy9E0ZeNdt34FL1fZLxSX/2AVVxpAr3o+q7Lz0S3h8W4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762452089; c=relaxed/simple; bh=dMhrb4k0NLQTzG9CdasHB8pF4LD/TSGmYxk7iyEfZqc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=YSvsA7U5pM9RCdwxyLmsO44kV8DUB06tkewtxQgVubcX3JvN26fDexuI/FjRUqT88zF5sUGcoVnjAjBvNplrX+DfXHo9428vhCuTEvEKtlWWHsqwaEbJeQtEDSVrZi24vToeGtW6C6foyyprFtVtM2InP1pNDmu62sLWa77wkgo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WB7yYBKU; 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="WB7yYBKU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EEBDCC116C6; Thu, 6 Nov 2025 18:01:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762452088; bh=dMhrb4k0NLQTzG9CdasHB8pF4LD/TSGmYxk7iyEfZqc=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=WB7yYBKUOX/lE4WZY3g8QG/RvBLCrGkug7SbS55SwPbAyl2h/5knvTDVX7fdQR0dn /r2h5zqyYYg4YpTcRl4bb17O2pbs9f8Ty0hcR98EO81Rf0vm6/jnoROJ67IgB19hqt I87SfjjtAKzWhX9MRD5MywBx0QTkPqPYiAJOBd6v77Lsv/0J7lP9WK3VTY8q4pv96C sc7RfxgdkgPYVq+mqEd1yKOjQfYhp6cb6cjLMpB5vtuslVF+sXEk2nxjPYIbxlTOp7 xn4l6FSe3rrrS+hYzYdvxTjPCAUZ0rwMgS5itofFbs6IlBmNPX49Qy46dSE4Ot/9So ttgrYph6IXC0g== Message-ID: Subject: Re: [PATCH] vfs: remove the excl argument from the ->create() inode_operation From: Jeff Layton To: NeilBrown Cc: Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , David Sterba , David Howells , Marc Dionne , Alexander Viro , Christian Brauner , Jan Kara , "Tigran A. Aivazian" , Chris Mason , Xiubo Li , Ilya Dryomov , Jan Harkes , coda@cs.cmu.edu, Tyler Hicks , Jeremy Kerr , Ard Biesheuvel , Namjae Jeon , Sungjong Seo , Yuezhang Mo , Theodore Ts'o , Andreas Dilger , Jaegeuk Kim , Chao Yu , OGAWA Hirofumi , Miklos Szeredi , Andreas Gruenbacher , Viacheslav Dubeyko , John Paul Adrian Glaubitz , Yangtao Li , Richard Weinberger , Anton Ivanov , Johannes Berg , Mikulas Patocka , Muchun Song , Oscar Salvador , David Hildenbrand , David Woodhouse , Dave Kleikamp , Trond Myklebust , Anna Schumaker , Ryusuke Konishi , Konstantin Komarov , Mark Fasheh , Joel Becker , Joseph Qi , Bob Copeland , Mike Marshall , Martin Brandenburg , Amir Goldstein , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , Zhihao Cheng , Hans de Goede , Carlos Maiolino , Hugh Dickins , Baolin Wang , Andrew Morton , Kees Cook , "Gustavo A. R. Silva" , linux-kernel@vger.kernel.org, v9fs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-afs@lists.infradead.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, ecryptfs@vger.kernel.org, linux-efi@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, gfs2@lists.linux.dev, linux-um@lists.infradead.org, linux-mm@kvack.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, linux-karma-devel@lists.sourceforge.net, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-xfs@vger.kernel.org, linux-hardening@vger.kernel.org Date: Thu, 06 Nov 2025 13:01:20 -0500 In-Reply-To: <6758176514cdd6e2ceacb3bd0e4d63fb8784b7c6.camel@kernel.org> References: <20251105-create-excl-v1-1-a4cce035cc55@kernel.org> 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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 3.58.1 (3.58.1-1.fc43) Precedence: bulk X-Mailing-List: linux-nilfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-11-06 at 07:07 -0500, Jeff Layton wrote: > On Thu, 2025-11-06 at 08:23 +1100, NeilBrown wrote: > > On Thu, 06 Nov 2025, Jeff Layton wrote: > > > Since ce8644fcadc5 ("lookup_open(): expand the call of vfs_create()")= , > > > the "excl" argument to the ->create() inode_operation is always set t= o > > > true. Remove it, and fix up all of the create implementations. > >=20 > > nonono > >=20 > >=20 > > > @@ -3802,7 +3802,7 @@ static struct dentry *lookup_open(struct nameid= ata *nd, struct file *file, > > > } > > > =20 > > > error =3D dir_inode->i_op->create(idmap, dir_inode, dentry, > > > - mode, open_flag & O_EXCL); > > > + mode); > >=20 > > "open_flag & O_EXCL" is not the same as "true". > >=20 > > It is true that "all calls to vfs_create() pass true for 'excl'" > > The same is NOT true for inode_operations.create. > >=20 >=20 > I don't think this is a problem, actually: >=20 > Almost all of the existing ->create() operations ignore the "excl" > bool. There are only two that I found that do not: NFS and GFS2. Both > of those have an ->atomic_open() operation though, so lookup_open() > will never call ->create() for those filesystems. This means that - > > create() _is_ always called with excl =3D=3D true. How about this for a revised changelog, which makes the above clear: vfs: remove the excl argument from the ->create() inode_operation =20 Since ce8644fcadc5 ("lookup_open(): expand the call of vfs_create()"), the "excl" argument to the ->create() inode_operation is always set to true in vfs_create(). =20 There is another call to ->create() in lookup_open() that can set it to either true or false. All of the ->create() operations in the kernel ignore the excl argument, except for NFS and GFS2. Both NFS and GFS2 have an ->atomic_open() operation, however so lookup_open() will never call ->create() on those filesystems. =20 Remove the "excl" argument from the ->create() operation, and fix up th= e filesystems accordingly. Maybe we also need some comments or updates to Documentation/ to make it clear that ->create() always implies O_EXCL semantics? --=20 Jeff Layton