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 CA3ED748D; Wed, 7 May 2025 15:34:38 +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=1746632078; cv=none; b=OF+KS5YRNI7ihfG/EwhBm+PdZVG3MVQdBsllnuVif/VC0Su3J3mwsaYaDRly8AsFEcEy+BlCHh0w1+/gJ0jz7tWFs0assUOSQsE8VgbTaWvYoZFVIcEmXoHaIEEA+S920wmg8CBzAR45u9w0cTo1KJIzR5z+vB5Mw9f5q/ZGWWo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746632078; c=relaxed/simple; bh=Ok7u6LBoKGfJAF9tBNN43W2Bk0yrb0kqkYv9jxCF5dw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=c6gUwZozmI65KYmUnj7oUkqaIvU7xNzlhyWfYjtOpRPkCQSNBN/fLSACSkqKFa4KIwwQ76R5XoN3DQ9etag2698iATrOx7dqOj2IJYMZgl+oeSUcVs1M8fcRf+QRLjdIPc9y2H22UxvkMplInwMSVEmidSS1wgpro4oStcYflco= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rAFUoSQ6; 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="rAFUoSQ6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88FD9C4CEE2; Wed, 7 May 2025 15:34:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746632078; bh=Ok7u6LBoKGfJAF9tBNN43W2Bk0yrb0kqkYv9jxCF5dw=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=rAFUoSQ6rC39yiNpaMBSD7TInrcA+77kty1PNmh8J1pvuBZoyg2RBtr7kVcFfuuUb e6jeP5gqM1S0pzN5kSmwCNqu7lx92XcT29YCVjrzpoQexRwe5OlC6PdspR1nMe9WEO pO/SetlQcbPJMnF7VgTb3g/u1/K2rBtJmpADtx8BrEst/AmyYys91n3npM+tHD3L4/ JIkQeiOvOrNNJmg7MUDNeY+UqjYB4lFI+6oa+8xhVfXocIRbKbRTIl/dl7ZcsNNap4 ytZfFe17/SiCHNwhMXqfBeewsL8GlVn0NlksJLTqMnfV9AHhbpnazpeLeZuxgcOKiP XJ9CoqmWFHBEQ== Message-ID: Subject: Re: [PATCH v3] NFSD: Implement FATTR4_CLONE_BLKSIZE attribute From: Jeff Layton To: cel@kernel.org, NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, Chuck Lever , Roland Mainz , Christoph Hellwig , stable@vger.kernel.org Date: Wed, 07 May 2025 11:34:36 -0400 In-Reply-To: <20250507144515.6864-1-cel@kernel.org> References: <20250507144515.6864-1-cel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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7862 states that if an NFS server implements a CLONE operation, > it MUST also implement FATTR4_CLONE_BLKSIZE. NFSD implements CLONE, > but does not implement FATTR4_CLONE_BLKSIZE. >=20 > Note that in Section 12.2, RFC 7862 claims that > FATTR4_CLONE_BLKSIZE is RECOMMENDED, not REQUIRED. Likely this is > because a minor version is not permitted to add a REQUIRED > attribute. Confusing. >=20 Isn't CLONE itself an optional operation? It wouldn't make sense to REQUIRE this attribute on servers that don't support CLONE, so I think it makes sense that it should be optional. Anyway, I'm just being pedantic. =20 > We assume this attribute reports a block size as a count of bytes, > as RFC 7862 does not specify a unit. >=20 > Reported-by: Roland Mainz > Suggested-by: Christoph Hellwig > Reviewed-by: Roland Mainz > Cc: stable@vger.kernel.org # v6.7+ > Signed-off-by: Chuck Lever > --- > fs/nfsd/nfs4xdr.c | 19 ++++++++++++++++++- > 1 file changed, 18 insertions(+), 1 deletion(-) >=20 > diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c > index e67420729ecd..9eb8e5704622 100644 > --- a/fs/nfsd/nfs4xdr.c > +++ b/fs/nfsd/nfs4xdr.c > @@ -3391,6 +3391,23 @@ static __be32 nfsd4_encode_fattr4_suppattr_exclcre= at(struct xdr_stream *xdr, > return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]); > } > =20 > +/* > + * Copied from generic_remap_checks/generic_remap_file_range_prep. > + * > + * These generic functions use the file system's s_blocksize, but > + * individual file systems aren't required to use > + * generic_remap_file_range_prep. Until there is a mechanism for > + * determining a particular file system's (or file's) clone block > + * size, this is the best NFSD can do. > + */ > +static __be32 nfsd4_encode_fattr4_clone_blksize(struct xdr_stream *xdr, > + const struct nfsd4_fattr_args *args) > +{ > + struct inode *inode =3D d_inode(args->dentry); > + > + return nfsd4_encode_uint32_t(xdr, inode->i_sb->s_blocksize); > +} > + > #ifdef CONFIG_NFSD_V4_SECURITY_LABEL > static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr, > const struct nfsd4_fattr_args *args) > @@ -3545,7 +3562,7 @@ static const nfsd4_enc_attr nfsd4_enc_fattr4_encode= _ops[] =3D { > [FATTR4_MODE_SET_MASKED] =3D nfsd4_encode_fattr4__noop, > [FATTR4_SUPPATTR_EXCLCREAT] =3D nfsd4_encode_fattr4_suppattr_exclcreat, > [FATTR4_FS_CHARSET_CAP] =3D nfsd4_encode_fattr4__noop, > - [FATTR4_CLONE_BLKSIZE] =3D nfsd4_encode_fattr4__noop, > + [FATTR4_CLONE_BLKSIZE] =3D nfsd4_encode_fattr4_clone_blksize, > [FATTR4_SPACE_FREED] =3D nfsd4_encode_fattr4__noop, > [FATTR4_CHANGE_ATTR_TYPE] =3D nfsd4_encode_fattr4__noop, > =20 Reviewed-by: Jeff Layton