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 3AC6B3595D; Thu, 9 Oct 2025 15:07:52 +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=1760022473; cv=none; b=h6IzJnNqTN8nSybIWuRYtphZVELTEwwOf9jhZQXNk538PBIz9ZFK22Dc2e5Trtkm1H9h8X+EHeKFFrHf2orlgHE5BG3mIUefIVtgFDkWnvGmop9id+tZftV17BeubVTByAW/hE25jOdgJ0pIDKmILAmDI0PDCZDtBSq0oW3WiYQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760022473; c=relaxed/simple; bh=n/f+UkudxKmaK112kSwrB+SawNJ755RJI4OBmH9AOKk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=lnCc8vHcm0Cnb2f7T2Rlz7Phc9QG1GeiJFqpNBkKs4hT4709I5uUVQ1KaiYtSR2ugFTBU94Ad7wgxtwbvQ7U446zPrfqXtT7pYp7yVUH5W5OQDLG6EfEBtMWArtYQxHWUow5hAOJCl569jvv/1gOM6F8HyDp3HePQkId0outw2Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hWCmmCaE; 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="hWCmmCaE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B70E2C4CEE7; Thu, 9 Oct 2025 15:07:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760022472; bh=n/f+UkudxKmaK112kSwrB+SawNJ755RJI4OBmH9AOKk=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=hWCmmCaEC1JHL12UL8qUbMNQ3go06kQ31Ekh0blvU0drXn3b40p8SXJZZhD9rdTW1 mvvxdWHekyYzt47a2wRk91jknksqjHBiy4pw9stihR/lOgjpaAAZ13nKYoDNaHnGGD /3bRoVdpBP7AY0BNGNBQsmghOv/EWC1wnbV6dDXBwIp5Qen5MGunsw/uLzrplBrsEf ccpDYMHn2mRkSpHk08eeN+mgdhcYlFwMB2cdWQGOYmJJ/ydnrCZpN1oPdI1KM3Gnqy k7sVK45TmrFArca78AO8i3pelhI0V9VlOOm5kRSnVRJVtr8r0sbKWoXv4PwkQXDeuY vTSilpk5e1GjA== Message-ID: Subject: Re: [PATCH v3 2/2] sunrpc: add a slot to rqstp->rq_bvec for TCP record marker From: Jeff Layton To: Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , David Howells Cc: Brandon Adams , linux-nfs@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 09 Oct 2025 11:07:49 -0400 In-Reply-To: <56718ad5-fdb3-4588-bab9-7b9a1879cad0@oracle.com> References: <20251009-rq_bvec-v3-0-57181360b9cb@kernel.org> <20251009-rq_bvec-v3-2-57181360b9cb@kernel.org> <56718ad5-fdb3-4588-bab9-7b9a1879cad0@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf CBYyUE8QJpvTZyfUHNYldXlrjO6n5MdOempLqWpfOmcGkwnyNRBR46g/jf8KnPRwXs509yAqDB6sE LZH+yWr9LQZEwARAQABtCVKZWZmIExheXRvbiA8amxheXRvbkBwb29jaGllcmVkcy5uZXQ+iQI7BB MBAgAlAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCTpXWPAIZAQAKCRAADmhBGVaCFc65D/4 gBLNMHopQYgG/9RIM3kgFCCQV0pLv0hcg1cjr+bPI5f1PzJoOVi9s0wBDHwp8+vtHgYhM54yt43uI 7Htij0RHFL5eFqoVT4TSfAg2qlvNemJEOY0e4daljjmZM7UtmpGs9NN0r9r50W82eb5Kw5bc/r0km R/arUS2st+ecRsCnwAOj6HiURwIgfDMHGPtSkoPpu3DDp/cjcYUg3HaOJuTjtGHFH963B+f+hyQ2B rQZBBE76ErgTDJ2Db9Ey0kw7VEZ4I2nnVUY9B5dE2pJFVO5HJBMp30fUGKvwaKqYCU2iAKxdmJXRI ONb7dSde8LqZahuunPDMZyMA5+mkQl7kpIpR6kVDIiqmxzRuPeiMP7O2FCUlS2DnJnRVrHmCljLkZ Wf7ZUA22wJpepBligemtSRSbqCyZ3B48zJ8g5B8xLEntPo/NknSJaYRvfEQqGxgk5kkNWMIMDkfQO lDSXZvoxqU9wFH/9jTv1/6p8dHeGM0BsbBLMqQaqnWiVt5mG92E1zkOW69LnoozE6Le+12DsNW7Rj iR5K+27MObjXEYIW7FIvNN/TQ6U1EOsdxwB8o//Yfc3p2QqPr5uS93SDDan5ehH59BnHpguTc27Xi QQZ9EGiieCUx6Zh2ze3X2UW9YNzE15uKwkkuEIj60NvQRmEDfweYfOfPVOueC+iFifbQgSmVmZiBM YXl0b24gPGpsYXl0b25AcmVkaGF0LmNvbT6JAjgEEwECACIFAk6V0q0CGwMGCwkIBwMCBhUIAgkKC wQWAgMBAh4BAheAAAoJEAAOaEEZVoIViKUQALpvsacTMWWOd7SlPFzIYy2/fjvKlfB/Xs4YdNcf9q LqF+lk2RBUHdR/dGwZpvw/OLmnZ8TryDo2zXVJNWEEUFNc7wQpl3i78r6UU/GUY/RQmOgPhs3epQC 3PMJj4xFx+VuVcf/MXgDDdBUHaCTT793hyBeDbQuciARDJAW24Q1RCmjcwWIV/pgrlFa4lAXsmhoa c8UPc82Ijrs6ivlTweFf16VBc4nSLX5FB3ls7S5noRhm5/Zsd4PGPgIHgCZcPgkAnU1S/A/rSqf3F LpU+CbVBDvlVAnOq9gfNF+QiTlOHdZVIe4gEYAU3CUjbleywQqV02BKxPVM0C5/oVjMVx3bri75n1 TkBYGmqAXy9usCkHIsG5CBHmphv9MHmqMZQVsxvCzfnI5IO1+7MoloeeW/lxuyd0pU88dZsV/riHw 87i2GJUJtVlMl5IGBNFpqoNUoqmvRfEMeXhy/kUX4Xc03I1coZIgmwLmCSXwx9MaCPFzV/dOOrju2 xjO+2sYyB5BNtxRqUEyXglpujFZqJxxau7E0eXoYgoY9gtFGsspzFkVNntamVXEWVVgzJJr/EWW0y +jNd54MfPRqH+eCGuqlnNLktSAVz1MvVRY1dxUltSlDZT7P2bUoMorIPu8p7ZCg9dyX1+9T6Muc5d Hxf/BBP/ir+3e8JTFQBFOiLNdFtB9KZWZmIExheXRvbiA8amxheXRvbkBzYW1iYS5vcmc+iQI4BBM BAgAiBQJOldK9AhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRAADmhBGVaCFWgWD/0ZRi4h N9FK2BdQs9RwNnFZUr7JidAWfCrs37XrA/56olQl3ojn0fQtrP4DbTmCuh0SfMijB24psy1GnkPep naQ6VRf7Dxg/Y8muZELSOtsv2CKt3/02J1BBitrkkqmHyni5fLLYYg6fub0T/8Kwo1qGPdu1hx2BQ RERYtQ/S5d/T0cACdlzi6w8rs5f09hU9Tu4qV1JLKmBTgUWKN969HPRkxiojLQziHVyM/weR5Reu6 FZVNuVBGqBD+sfk/c98VJHjsQhYJijcsmgMb1NohAzwrBKcSGKOWJToGEO/1RkIN8tqGnYNp2G+aR 685D0chgTl1WzPRM6mFG1+n2b2RR95DxumKVpwBwdLPoCkI24JkeDJ7lXSe3uFWISstFGt0HL8Eew P8RuGC8s5h7Ct91HMNQTbjgA+Vi1foWUVXpEintAKgoywaIDlJfTZIl6Ew8ETN/7DLy8bXYgq0Xzh aKg3CnOUuGQV5/nl4OAX/3jocT5Cz/OtAiNYj5mLPeL5z2ZszjoCAH6caqsF2oLyAnLqRgDgR+wTQ T6gMhr2IRsl+cp8gPHBwQ4uZMb+X00c/Amm9VfviT+BI7B66cnC7Zv6Gvmtu2rEjWDGWPqUgccB7h dMKnKDthkA227/82tYoFiFMb/NwtgGrn5n2vwJyKN6SEoygGrNt0SI84y6hEVbQlSmVmZiBMYXl0b 24gPGpsYXl0b25AcHJpbWFyeWRhdGEuY29tPokCOQQTAQIAIwUCU4xmKQIbAwcLCQgHAwIBBhUIAg kKCwQWAgMBAh4BAheAAAoJEAAOaEEZVoIV1H0P/j4OUTwFd7BBbpoSp695qb6HqCzWMuExsp8nZjr uymMaeZbGr3OWMNEXRI1FWNHMtcMHWLP/RaDqCJil28proO+PQ/yPhsr2QqJcW4nr91tBrv/MqItu AXLYlsgXqp4BxLP67bzRJ1Bd2x0bWXurpEXY//VBOLnODqThGEcL7jouwjmnRh9FTKZfBDpFRaEfD FOXIfAkMKBa/c9TQwRpx2DPsl3eFWVCNuNGKeGsirLqCxUg5kWTxEorROppz9oU4HPicL6rRH22Ce 6nOAON2vHvhkUuO3GbffhrcsPD4DaYup4ic+DxWm+DaSSRJ+e1yJvwi6NmQ9P9UAuLG93S2MdNNbo sZ9P8k2mTOVKMc+GooI9Ve/vH8unwitwo7ORMVXhJeU6Q0X7zf3SjwDq2lBhn1DSuTsn2DbsNTiDv qrAaCvbsTsw+SZRwF85eG67eAwouYk+dnKmp1q57LDKMyzysij2oDKbcBlwB/TeX16p8+LxECv51a sjS9TInnipssssUDrHIvoTTXWcz7Y5wIngxDFwT8rPY3EggzLGfK5Zx2Q5S/N0FfmADmKknG/D8qG IcJE574D956tiUDKN4I+/g125ORR1v7bP+OIaayAvq17RP+qcAqkxc0x8iCYVCYDouDyNvWPGRhbL UO7mlBpjW9jK9e2fvZY9iw3QzIPGKtClKZWZmIExheXRvbiA8amVmZi5sYXl0b25AcHJpbWFyeWRh dGEuY29tPokCOQQTAQIAIwUCU4xmUAIbAwcLCQgHAwIBBhUIAgkKCwQWAgMBAh4BAheAAAoJEAAOa EEZVoIVzJoQALFCS6n/FHQS+hIzHIb56JbokhK0AFqoLVzLKzrnaeXhE5isWcVg0eoV2oTScIwUSU apy94if69tnUo4Q7YNt8/6yFM6hwZAxFjOXR0ciGE3Q+Z1zi49Ox51yjGMQGxlakV9ep4sV/d5a50 M+LFTmYSAFp6HY23JN9PkjVJC4PUv5DYRbOZ6Y1+TfXKBAewMVqtwT1Y+LPlfmI8dbbbuUX/kKZ5d dhV2736fgyfpslvJKYl0YifUOVy4D1G/oSycyHkJG78OvX4JKcf2kKzVvg7/Rnv+AueCfFQ6nGwPn 0P91I7TEOC4XfZ6a1K3uTp4fPPs1Wn75X7K8lzJP/p8lme40uqwAyBjk+IA5VGd+CVRiyJTpGZwA0 jwSYLyXboX+Dqm9pSYzmC9+/AE7lIgpWj+3iNisp1SWtHc4pdtQ5EU2SEz8yKvDbD0lNDbv4ljI7e flPsvN6vOrxz24mCliEco5DwhpaaSnzWnbAPXhQDWb/lUgs/JNk8dtwmvWnqCwRqElMLVisAbJmC0 BhZ/Ab4sph3EaiZfdXKhiQqSGdK4La3OTJOJYZphPdGgnkvDV9Pl1QZ0ijXQrVIy3zd6VCNaKYq7B AKidn5g/2Q8oio9Tf4XfdZ9dtwcB+bwDJFgvvDYaZ5bI3ln4V3EyW5i2NfXazz/GA/I/ZtbsigCFc 8ftCBKZWZmIExheXRvbiA8amxheXRvbkBrZXJuZWwub3JnPokCOAQTAQIAIgUCWe8u6AIbAwYLCQg HAwIGFQgCCQoLBBYCAwECHgECF4AACgkQAA5oQRlWghUuCg/+Lb/xGxZD2Q1oJVAE37uW308UpVSD 2tAMJUvFTdDbfe3zKlPDTuVsyNsALBGclPLagJ5ZTP+Vp2irAN9uwBuacBOTtmOdz4ZN2tdvNgozz uxp4CHBDVzAslUi2idy+xpsp47DWPxYFIRP3M8QG/aNW052LaPc0cedYxp8+9eiVUNpxF4SiU4i9J DfX/sn9XcfoVZIxMpCRE750zvJvcCUz9HojsrMQ1NFc7MFT1z3MOW2/RlzPcog7xvR5ENPH19ojRD CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO 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 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-10-09 at 11:03 -0400, Chuck Lever wrote: > On 10/9/25 10:40 AM, Jeff Layton wrote: > > We've seen some occurrences of messages like this in dmesg on some knfs= d > > servers: > >=20 > > xdr_buf_to_bvec: bio_vec array overflow > >=20 > > Usually followed by messages like this that indicate a short send (note > > that this message is from an older kernel and the amount that it report= s > > attempting to send is short by 4 bytes): > >=20 > > rpc-srv/tcp: nfsd: sent 1048155 when sending 1048152 bytes - shutti= ng down socket > >=20 > > svc_tcp_sendmsg() steals a slot in the rq_bvec array for the TCP record > > marker. If the send is an unaligned READ call though, then there may no= t > > be enough slots in the rq_bvec array in some cases. > >=20 > > Add a rqstp->rq_bvec_len field and use that to keep track of the length > > of rq_bvec. Use that in place of rq_maxpages where it's iterating over > > the bvec. >=20 > Granted that the number of items in rq_pages and in rq_bvec don't have > to coincide, they just happen to be the same, historically. And, each > bvec in rq_bvec doesn't necessarily have to be a page. >=20 >=20 > > Fixes: e18e157bb5c8 ("SUNRPC: Send RPC message on TCP with a single soc= k_sendmsg() call") > > Tested-by: Brandon Adams > > Signed-off-by: Jeff Layton > > --- > > fs/nfsd/vfs.c | 6 +++--- > > include/linux/sunrpc/svc.h | 1 + > > net/sunrpc/svc.c | 4 +++- > > net/sunrpc/svcsock.c | 4 ++-- > > 4 files changed, 9 insertions(+), 6 deletions(-) > >=20 > > diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c > > index 77f6879c2e063fa79865100bbc2d1e64eb332f42..6c7224570d2dadae21876e0= 069e0b2e0551af0fa 100644 > > --- a/fs/nfsd/vfs.c > > +++ b/fs/nfsd/vfs.c > > @@ -1111,7 +1111,7 @@ nfsd_direct_read(struct svc_rqst *rqstp, struct s= vc_fh *fhp, > > =20 > > v =3D 0; > > total =3D dio_end - dio_start; > > - while (total && v < rqstp->rq_maxpages && > > + while (total && v < rqstp->rq_bvec_len && > > rqstp->rq_next_page < rqstp->rq_page_end) { > > len =3D min_t(size_t, total, PAGE_SIZE); > > bvec_set_page(&rqstp->rq_bvec[v], *rqstp->rq_next_page, > > @@ -1200,7 +1200,7 @@ __be32 nfsd_iter_read(struct svc_rqst *rqstp, str= uct svc_fh *fhp, > > =20 > > v =3D 0; > > total =3D *count; > > - while (total && v < rqstp->rq_maxpages && > > + while (total && v < rqstp->rq_bvec_len && > > rqstp->rq_next_page < rqstp->rq_page_end) { > > len =3D min_t(size_t, total, PAGE_SIZE - base); > > bvec_set_page(&rqstp->rq_bvec[v], *rqstp->rq_next_page, > > @@ -1318,7 +1318,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc= _fh *fhp, > > if (stable && !fhp->fh_use_wgather) > > kiocb.ki_flags |=3D IOCB_DSYNC; > > =20 > > - nvecs =3D xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_maxpages, payload= ); > > + nvecs =3D xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_bvec_len, payload= ); > > iov_iter_bvec(&iter, ITER_SOURCE, rqstp->rq_bvec, nvecs, *cnt); > > since =3D READ_ONCE(file->f_wb_err); > > if (verf) > > diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h > > index 5506d20857c318774cd223272d4b0022cc19ffb8..0ee1f411860e55d5e0131c2= 9766540f673193d5f 100644 > > --- a/include/linux/sunrpc/svc.h > > +++ b/include/linux/sunrpc/svc.h > > @@ -206,6 +206,7 @@ struct svc_rqst { > > =20 > > struct folio_batch rq_fbatch; > > struct bio_vec *rq_bvec; > > + u32 rq_bvec_len; > > =20 > > __be32 rq_xid; /* transmission id */ > > u32 rq_prog; /* program number */ > > diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c > > index 4704dce7284eccc9e2bc64cf22947666facfa86a..a6bdd83fba77b13f973da66= a1bac00050ae922fe 100644 > > --- a/net/sunrpc/svc.c > > +++ b/net/sunrpc/svc.c > > @@ -706,7 +706,9 @@ svc_prepare_thread(struct svc_serv *serv, struct sv= c_pool *pool, int node) > > if (!svc_init_buffer(rqstp, serv, node)) > > goto out_enomem; > > =20 > > - rqstp->rq_bvec =3D kcalloc_node(rqstp->rq_maxpages, > > + /* +1 for the TCP record marker */ > > + rqstp->rq_bvec_len =3D rqstp->rq_maxpages + 1; >=20 > What bugs me about this is that svc_prepare_thread() shouldn't have > specific knowledge about the needs of transports. But I don't have a > better idea... >=20 Yeah, it's a minor layering violation. I guess I could phrase it as: /* Some transports need an extra bvec. (e.g. TCP needs it for the recor= d marker) */ ...but I'm not sure that's any clearer. >=20 > > + rqstp->rq_bvec =3D kcalloc_node(rqstp->rq_bvec_len, > > sizeof(struct bio_vec), > > GFP_KERNEL, node); > > if (!rqstp->rq_bvec) > > diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c > > index 377fcaaaa061463fc5c85fc09c7a8eab5e06af77..2075ddec250b3fdb36becca= 4a53f1c0536f8634a 100644 > > --- a/net/sunrpc/svcsock.c > > +++ b/net/sunrpc/svcsock.c > > @@ -740,7 +740,7 @@ static int svc_udp_sendto(struct svc_rqst *rqstp) > > if (svc_xprt_is_dead(xprt)) > > goto out_notconn; > > =20 > > - count =3D xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_maxpages, xdr); > > + count =3D xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_bvec_len, xdr); > > =20 > > iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, rqstp->rq_bvec, > > count, rqstp->rq_res.len); > > @@ -1244,7 +1244,7 @@ static int svc_tcp_sendmsg(struct svc_sock *svsk,= struct svc_rqst *rqstp, > > memcpy(buf, &marker, sizeof(marker)); > > bvec_set_virt(rqstp->rq_bvec, buf, sizeof(marker)); > > =20 > > - count =3D xdr_buf_to_bvec(rqstp->rq_bvec + 1, rqstp->rq_maxpages - 1, > > + count =3D xdr_buf_to_bvec(rqstp->rq_bvec + 1, rqstp->rq_bvec_len - 1, > > &rqstp->rq_res); > > =20 > > iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, rqstp->rq_bvec, > >=20 >=20 --=20 Jeff Layton