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 15B6D31716B; Fri, 27 Mar 2026 15:50:52 +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=1774626653; cv=none; b=XAol+FNMrnAL7FAJlaO5+5LW8rnQkTQ1lSi49t2FyeofX/8UvCCVaMWBUvs8DF1hFobXaUie/OLAW5gttSkZ1HUDGBruPoz64lKuBMkQVtHtDCufiigY6+mwkttf2WlNY8TiD9Vvtxa78EBeX59h7syT6iApyYsS0JrWM/mezhU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774626653; c=relaxed/simple; bh=7yA/cNZmjKFo6T2tOmWcOncESIr4LeI9KWON6CqSpAU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ftz1k1m0i4JmKgGZx/26OVa+IVObD+7mz2b+l7QIQAbepV5ykM4tjM4pR+mtiEFF+1F0x/VLlGtP4A2TEUkB7Br2Fl+HTUU5yo3D1WskpOmxytZ9D74TuIR8MNKqFbNeHFLBktwUcrAtghDn3ERHcg9/eC4KlQmNQfAKDxSrRMI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mbPyXpCr; 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="mbPyXpCr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 313BFC19423; Fri, 27 Mar 2026 15:50:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774626652; bh=7yA/cNZmjKFo6T2tOmWcOncESIr4LeI9KWON6CqSpAU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=mbPyXpCrILcYrp2WqDCGCAPgdOxX72ZPc5iD+QuGPjal9mxBoqzDFzPE7F7XKlRcT hAYcRtaWG3WcLXSDsWDwM3kBjtED2pAUTs5+JoLB4D0hCnXGT2aw+bpLI2WOAptzLc PuU3W6jQgpnlyjP4pbYPkTWw56Lpg5VmyEsoMctLimB92hhG43MJdcgquTcizaljb4 YhUu9yIIvojW2aHahE5bEOSBIpRmxmks4gNB2SyKWEm3uSMwCaR/hVF3FJx7c4w9O6 HQ6lw2S+yT337GDZ6FiYBTfIQ9jFlLu43PFHsXeAJxKQnFmN+jvPJ8UViqQ1DKM6k5 PzE+uExJT7QYw== Message-ID: <284ca17e74af8c4f5942b2952f2bf75490dd17c0.camel@kernel.org> Subject: Re: [PATCH v2 2/2] nfs: update inode ctime after removexattr operation From: Jeff Layton To: Olga Kornievskaia Cc: Trond Myklebust , Anna Schumaker , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 27 Mar 2026 11:50:50 -0400 In-Reply-To: References: <20260324-nfs-7-1-v2-0-d110da3c0036@kernel.org> <20260324-nfs-7-1-v2-2-d110da3c0036@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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2026 at 1:32=E2=80=AFPM Jeff Layton = wrote: > >=20 > > xfstest generic/728 fails with delegated timestamps. The client does a > > removexattr and then a stat to test the ctime, which doesn't change. Th= e > > stat() doesn't trigger a GETATTR because of the delegated timestamps, s= o > > it relies on the cached ctime, which is wrong. > >=20 > > The setxattr compound has a trailing GETATTR, which ensures that its > > ctime gets updated. Follow the same strategy with removexattr. >=20 > This approach relies on the fact that the server the serves delegated > attributes would update change_attr on operations which might now > necessarily happen (ie, linux server does not update change_attribute > on writes or clone). I propose an alternative fix for the failing > generic/728. >=20 > diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c > index 7b3ca68fb4bb..ede1835a45b3 100644 > --- a/fs/nfs/nfs42proc.c > +++ b/fs/nfs/nfs42proc.c > @@ -1389,7 +1389,13 @@ static int _nfs42_proc_removexattr(struct inode > *inode, const char *name) > &res.seq_res, 1); > trace_nfs4_removexattr(inode, name, ret); > if (!ret) > - nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0); > + if (nfs_have_delegated_attributes(inode)) { > + nfs_update_delegated_mtime(inode); > + spin_lock(&inode->i_lock); > + nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOC= KS); > + spin_unlock(&inode->i_lock); > + } else > + nfs4_update_changeattr(inode, &res.cinfo, timesta= mp, 0); >=20 > return ret; > } >=20 What's the advantage of doing it this way? You just sent a REMOVEXATTR operation to the server that will change the mtime there. The server has the most up-to-date version of the mtime and ctime at that point. It's certainly possible that the REMOVEXATTR is the only change that occurred. With what I'm proposing, we don't even need to do a SETATTR at all if nothing else changed. With your version, you would. > >=20 > > Fixes: 3e1f02123fba ("NFSv4.2: add client side XDR handling for extende= d attributes") > > Reported-by: Olga Kornievskaia > > Signed-off-by: Jeff Layton > > --- > > fs/nfs/nfs42proc.c | 18 ++++++++++++++++-- > > fs/nfs/nfs42xdr.c | 10 ++++++++-- > > include/linux/nfs_xdr.h | 3 +++ > > 3 files changed, 27 insertions(+), 4 deletions(-) > >=20 > > diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c > > index 7b3ca68fb4bb3bee293f8621e5ed5fa596f5da3f..7e5c1172fc11c9d5a55b362= 1977ac83bb98f7c20 100644 > > --- a/fs/nfs/nfs42proc.c > > +++ b/fs/nfs/nfs42proc.c > > @@ -1372,11 +1372,15 @@ int nfs42_proc_clone(struct file *src_f, struct= file *dst_f, > > static int _nfs42_proc_removexattr(struct inode *inode, const char *na= me) > > { > > struct nfs_server *server =3D NFS_SERVER(inode); > > + __u32 bitmask[NFS_BITMASK_SZ]; > > struct nfs42_removexattrargs args =3D { > > .fh =3D NFS_FH(inode), > > + .bitmask =3D bitmask, > > .xattr_name =3D name, > > }; > > - struct nfs42_removexattrres res; > > + struct nfs42_removexattrres res =3D { > > + .server =3D server, > > + }; > > struct rpc_message msg =3D { > > .rpc_proc =3D &nfs4_procedures[NFSPROC4_CLNT_REMOVEXATT= R], > > .rpc_argp =3D &args, > > @@ -1385,12 +1389,22 @@ static int _nfs42_proc_removexattr(struct inode= *inode, const char *name) > > int ret; > > unsigned long timestamp =3D jiffies; > >=20 > > + res.fattr =3D nfs_alloc_fattr(); > > + if (!res.fattr) > > + return -ENOMEM; > > + > > + nfs4_bitmask_set(bitmask, server->cache_consistency_bitmask, > > + inode, NFS_INO_INVALID_CHANGE); > > + > > ret =3D nfs4_call_sync(server->client, server, &msg, &args.seq_= args, > > &res.seq_res, 1); > > trace_nfs4_removexattr(inode, name, ret); > > - if (!ret) > > + if (!ret) { > > nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0)= ; > > + ret =3D nfs_post_op_update_inode(inode, res.fattr); > > + } > >=20 > > + kfree(res.fattr); > > return ret; > > } > >=20 > > diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c > > index 5c7452ce6e8ac94bd24bc3a33d4479d458a29907..ec105c62f721cfe01bfc60f= 5981396958084d627 100644 > > --- a/fs/nfs/nfs42xdr.c > > +++ b/fs/nfs/nfs42xdr.c > > @@ -263,11 +263,13 @@ > > #define NFS4_enc_removexattr_sz (compound_encode_hdr_ma= xsz + \ > > encode_sequence_maxsz + \ > > encode_putfh_maxsz + \ > > - encode_removexattr_maxsz) > > + encode_removexattr_maxsz + \ > > + encode_getattr_maxsz) > > #define NFS4_dec_removexattr_sz (compound_decode_hdr_ma= xsz + \ > > decode_sequence_maxsz + \ > > decode_putfh_maxsz + \ > > - decode_removexattr_maxsz) > > + decode_removexattr_maxsz + \ > > + decode_getattr_maxsz) > >=20 > > /* > > * These values specify the maximum amount of data that is not > > @@ -869,6 +871,7 @@ static void nfs4_xdr_enc_removexattr(struct rpc_rqs= t *req, > > encode_sequence(xdr, &args->seq_args, &hdr); > > encode_putfh(xdr, args->fh, &hdr); > > encode_removexattr(xdr, args->xattr_name, &hdr); > > + encode_getfattr(xdr, args->bitmask, &hdr); > > encode_nops(&hdr); > > } > >=20 > > @@ -1818,6 +1821,9 @@ static int nfs4_xdr_dec_removexattr(struct rpc_rq= st *req, > > goto out; > >=20 > > status =3D decode_removexattr(xdr, &res->cinfo); > > + if (status) > > + goto out; > > + status =3D decode_getfattr(xdr, res->fattr, res->server); > > out: > > return status; > > } > > diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h > > index ff1f12aa73d27b6fd874baf7019dd03195fc36e5..fcbd21b5685f46136a210c8= e11c20a54d6ed9dad 100644 > > --- a/include/linux/nfs_xdr.h > > +++ b/include/linux/nfs_xdr.h > > @@ -1611,12 +1611,15 @@ struct nfs42_listxattrsres { > > struct nfs42_removexattrargs { > > struct nfs4_sequence_args seq_args; > > struct nfs_fh *fh; > > + const u32 *bitmask; > > const char *xattr_name; > > }; > >=20 > > struct nfs42_removexattrres { > > struct nfs4_sequence_res seq_res; > > struct nfs4_change_info cinfo; > > + struct nfs_fattr *fattr; > > + const struct nfs_server *server; > > }; > >=20 > > #endif /* CONFIG_NFS_V4_2 */ > >=20 > > -- > > 2.53.0 > >=20 --=20 Jeff Layton