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 4FF5534678B; Tue, 4 Nov 2025 18:10:31 +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=1762279832; cv=none; b=KpxKIuvx2wGNpJRb2IGyQ5hfMqc9LMgggQ484YgGSVQGa2kcN3459VaH36x5054U8E+uPmcG1Bj069i9qpM6V1bbcz1sUB145jE+FL3grx3PN8UISHvFITpLC9KTtvDQSsHk2/rTZm7p2mC2zt5kf5acxDNgKQMoAVfj07/bmG0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762279832; c=relaxed/simple; bh=gG/b1YvIBThJQ7VI9xW8NHzcypqR4QPnbQ5E7Xh785k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=rMNyLMoBprxQpTRY7v6waY/gZSNy6ElkyEHKHlWk5SVAkXRujQJdW7NVeizhwFJy9SC6rA2eEbJI5Wzm3LsWm5JLqIbCva4BxPxwZOA6zfEkgjH5ZDXBwSMbUhcawoTa50m+poLi48ohTssOas6oYVIGgc4tZ77OTbXqM7BHpK8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=H6PhL26+; 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="H6PhL26+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4436AC2BCB5; Tue, 4 Nov 2025 18:10:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762279831; bh=gG/b1YvIBThJQ7VI9xW8NHzcypqR4QPnbQ5E7Xh785k=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=H6PhL26+p4Oy/kcc8Fr2t7iOOrX6ggeCdNEpYVTeEdXIPS7NFFMiqK7WrLNCK3CHR mN83rJbptK9amtOIWpJ6kT9pTB7YYZvPpAq7RrIkAu0xxyhrhkqDiWsNxn59nufze6 SW4qptBqgx772H/WAtWEUsfQPpfYr5DbDZx/FMj4Tn6Jd/zlUD/ysvyURDsVlvTSna ZHOmjWLlWouCXXERu3TDK9jdgVMrYy1W/SjQBQaarf1q1GHH5HMDsHnyzsmvfHqp+I SHbpSMZYdDI7qvsuE4ASweHBPAk7R7AJOLoAQO/agiDKUheBomX0vps2m238bGqcz2 NknfS/UjMiTFQ== Message-ID: <68c1c557d9499e63ffca00c8880ca6b63d9c1304.camel@kernel.org> Subject: Re: [PATCH v4 10/17] vfs: make vfs_create break delegations on parent directory From: Jeff Layton To: Simon Horman 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 , NeilBrown , 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 , 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, 04 Nov 2025 13:10:26 -0500 In-Reply-To: References: <20251103-dir-deleg-ro-v4-0-961b67adee89@kernel.org> <20251103-dir-deleg-ro-v4-10-961b67adee89@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV 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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 struct createdata. Most callers just > > leave that as a NULL pointer, but do_mknodat() is changed to wait for a > > delegation break if there is one. > >=20 > > Signed-off-by: Jeff Layton > > --- > > fs/namei.c | 26 +++++++++++++++++--------- > > include/linux/fs.h | 2 +- > > 2 files changed, 18 insertions(+), 10 deletions(-) > >=20 > > diff --git a/fs/namei.c b/fs/namei.c >=20 > ... >=20 > > @@ -4359,6 +4362,8 @@ static int may_mknod(umode_t mode) > > static int do_mknodat(int dfd, struct filename *name, umode_t mode, > > unsigned int dev) > > { > > + struct delegated_inode delegated_inode =3D { }; > > + struct createdata cargs =3D { }; > > struct mnt_idmap *idmap; > > struct dentry *dentry; > > struct path path; > > @@ -4383,18 +4388,16 @@ static int do_mknodat(int dfd, struct filename = *name, umode_t mode, > > switch (mode & S_IFMT) { > > case 0: > > case S_IFREG: > > - { > > - struct createdata args =3D { .idmap =3D idmap, > > - .dir =3D path.dentry->d_inode, > > - .dentry =3D dentry, > > - .mode =3D mode, > > - .excl =3D true }; > > - > > - error =3D vfs_create(&args); > > + cargs.idmap =3D idmap, > > + cargs.dir =3D path.dentry->d_inode, > > + cargs.dentry =3D dentry, > > + cargs.delegated_inode =3D &delegated_inode; > > + cargs.mode =3D mode, > > + cargs.excl =3D true, >=20 > Hi Jeff, >=20 > I don't think it makes any difference to the generated code. > But I think it would be more intuitive to use ';' rather than ',' > at the end of the lines immediately above. >=20 Definitely. Will fix. > > + error =3D vfs_create(&cargs); > > if (!error) > > security_path_post_mknod(idmap, dentry); > > break; > > - } > > case S_IFCHR: case S_IFBLK: > > error =3D vfs_mknod(idmap, path.dentry->d_inode, > > dentry, mode, new_decode_dev(dev)); >=20 > ... Thanks! --=20 Jeff Layton