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 D167C2B9B9; Fri, 17 Jan 2025 15:20:41 +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=1737127241; cv=none; b=Po1dJ84+lSq30h7ck1Y2NoGgw/2AVwcQIzXMipEjEwlZWUTTgq6RPGm6Q/uebfaLSuAM/6K+sMcLfim7Jjlgx2NPkLkY81E0pDRgsaSmi22huKcIQGmjDWsGDlE81n/wdzft0O4n3dmQ2Tg9YbfzzQtoJHtTNeP3B9DcbLxOFpo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737127241; c=relaxed/simple; bh=3KTPboxEg/ukMvkgn/Hy+n3A72cMPX/f9UWQqWwyIyM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Q+ARCvIWbg5BPrI+CgGUrzsHHYjEWsrFBhqpROuvsJFoF2R7uwvWJIYgbrAU2ZVgufz+JL82WcfK+jf094UuPWO41JXkTw9J5Z5RifaCYBPhwrpMD/yVHM79TnK4Rw4Ec028ww2LTKTlGf0dIy+xW0PBhOt4MEAbQTtpdp2uxU8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lfHfRM5h; 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="lfHfRM5h" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E7A4C4CEDD; Fri, 17 Jan 2025 15:20:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737127241; bh=3KTPboxEg/ukMvkgn/Hy+n3A72cMPX/f9UWQqWwyIyM=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=lfHfRM5h6oE7deAE7OHGmhr8bG7r18vtAWTiYQFWwmT3JT+Kpls41mkl0g4rF8M20 TcURoJFtmr+S2SV3nDy+hS2wZzIWXD1xLj5FFHtFWlHtnFLxo+hNsI9TBAnG1Is0ST 7DurM4SGvJdiRre2Cl+syeIuIkGze2cWTiFNI4HSQfQPzPIk0UD3a91s4xv1+T37oN 1x+7iDROV5sg/tsjl6r16DFQ1fEnqI8TXdwhvn2k86UT+FHNkFvav/2MuHR8cvn1H2 vsb072QjOOkpqXa29mgYfByU+4Smva6h/Tax9c1mTe1aQeRyfmOMshap2V3VbyvLws pQOUMHpWUMjEQ== Message-ID: <5d771ddf248edc671d8cce251ea1a594703ef2fa.camel@kernel.org> Subject: Re: [PATCH v2 11/20] fscrypt_d_revalidate(): use stable parent inode passed by caller From: Jeff Layton To: Al Viro , linux-fsdevel@vger.kernel.org Cc: agruenba@redhat.com, amir73il@gmail.com, brauner@kernel.org, ceph-devel@vger.kernel.org, dhowells@redhat.com, hubcap@omnibond.com, jack@suse.cz, krisman@kernel.org, linux-nfs@vger.kernel.org, miklos@szeredi.hu, torvalds@linux-foundation.org Date: Fri, 17 Jan 2025 10:20:39 -0500 In-Reply-To: <20250116052317.485356-11-viro@zeniv.linux.org.uk> References: <20250116052103.GF1977892@ZenIV> <20250116052317.485356-1-viro@zeniv.linux.org.uk> <20250116052317.485356-11-viro@zeniv.linux.org.uk> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.2 (3.54.2-1.fc41) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-01-16 at 05:23 +0000, Al Viro wrote: > The only thing it's using is parent directory inode and we are already > given a stable reference to that - no need to bother with boilerplate. >=20 > Signed-off-by: Al Viro > --- > fs/crypto/fname.c | 21 +++++---------------- > 1 file changed, 5 insertions(+), 16 deletions(-) >=20 > diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c > index 389f5b2bf63b..010f9c0a4c2f 100644 > --- a/fs/crypto/fname.c > +++ b/fs/crypto/fname.c > @@ -574,12 +574,10 @@ EXPORT_SYMBOL_GPL(fscrypt_fname_siphash); > * Validate dentries in encrypted directories to make sure we aren't pot= entially > * caching stale dentries after a key has been added. > */ > -int fscrypt_d_revalidate(struct inode *parent_dir, const struct qstr *na= me, > +int fscrypt_d_revalidate(struct inode *dir, const struct qstr *name, > struct dentry *dentry, unsigned int flags) > { > - struct dentry *dir; > int err; > - int valid; > =20 > /* > * Plaintext names are always valid, since fscrypt doesn't support > @@ -592,30 +590,21 @@ int fscrypt_d_revalidate(struct inode *parent_dir, = const struct qstr *name, > /* > * No-key name; valid if the directory's key is still unavailable. > * > - * Although fscrypt forbids rename() on no-key names, we still must use > - * dget_parent() here rather than use ->d_parent directly. That's > - * because a corrupted fs image may contain directory hard links, which > - * the VFS handles by moving the directory's dentry tree in the dcache > - * each time ->lookup() finds the directory and it already has a dentry > - * elsewhere. Thus ->d_parent can be changing, and we must safely grab > - * a reference to some ->d_parent to prevent it from being freed. > + * Note in RCU mode we have to bail if we get here - > + * fscrypt_get_encryption_info() may block. > */ > =20 > if (flags & LOOKUP_RCU) > return -ECHILD; > =20 > - dir =3D dget_parent(dentry); > /* > * Pass allow_unsupported=3Dtrue, so that files with an unsupported > * encryption policy can be deleted. > */ > - err =3D fscrypt_get_encryption_info(d_inode(dir), true); > - valid =3D !fscrypt_has_encryption_key(d_inode(dir)); > - dput(dir); > - > + err =3D fscrypt_get_encryption_info(dir, true); > if (err < 0) > return err; > =20 > - return valid; > + return !fscrypt_has_encryption_key(dir); > } > EXPORT_SYMBOL_GPL(fscrypt_d_revalidate); Reviewed-by: Jeff Layton