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Message-Id: <20251008-rq_bvec-v1-2-7f23d32d75e5@kernel.org>
Date: Wed, 08 Oct 2025 14:58:53 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, NeilBrown <neil@...wn.name>,
Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>,
Tom Talpey <tom@...pey.com>, Trond Myklebust <trondmy@...nel.org>,
Anna Schumaker <anna@...nel.org>, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
David Howells <dhowells@...hat.com>
Cc: linux-nfs@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 2/2] sunrpc: add a slot to rqstp->rq_bvec for TCP record
marker
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 not
be enough slots in the rq_bvec array.
Add a slot to the rq_bvec array, and fix up the array length
calculations.
Fixes: e18e157bb5c8 ("SUNRPC: Send RPC message on TCP with a single sock_sendmsg() call")
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
fs/nfsd/vfs.c | 6 +++---
net/sunrpc/svc.c | 3 ++-
net/sunrpc/svcsock.c | 4 ++--
3 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 77f6879c2e063fa79865100bbc2d1e64eb332f42..c4e9300d657cf7fdba23f2f4e4bdaad9cd99d1a3 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1111,7 +1111,7 @@ nfsd_direct_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
v = 0;
total = dio_end - dio_start;
- while (total && v < rqstp->rq_maxpages &&
+ while (total && v < rqstp->rq_maxpages + 1 &&
rqstp->rq_next_page < rqstp->rq_page_end) {
len = 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, struct svc_fh *fhp,
v = 0;
total = *count;
- while (total && v < rqstp->rq_maxpages &&
+ while (total && v < rqstp->rq_maxpages + 1 &&
rqstp->rq_next_page < rqstp->rq_page_end) {
len = 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 |= IOCB_DSYNC;
- nvecs = xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_maxpages, payload);
+ nvecs = xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_maxpages + 1, payload);
iov_iter_bvec(&iter, ITER_SOURCE, rqstp->rq_bvec, nvecs, *cnt);
since = READ_ONCE(file->f_wb_err);
if (verf)
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 4704dce7284eccc9e2bc64cf22947666facfa86a..919263a0c04e3f1afa607414bc1893ba02206e38 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -706,7 +706,8 @@ svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
if (!svc_init_buffer(rqstp, serv, node))
goto out_enomem;
- rqstp->rq_bvec = kcalloc_node(rqstp->rq_maxpages,
+ /* +1 for the TCP record marker */
+ rqstp->rq_bvec = kcalloc_node(rqstp->rq_maxpages + 1,
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..5f8bb11b686bcd7302b94476490ba9b1b9ddc06a 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;
- count = xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_maxpages, xdr);
+ count = xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_maxpages + 1, xdr);
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));
- count = xdr_buf_to_bvec(rqstp->rq_bvec + 1, rqstp->rq_maxpages - 1,
+ count = xdr_buf_to_bvec(rqstp->rq_bvec + 1, rqstp->rq_maxpages,
&rqstp->rq_res);
iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, rqstp->rq_bvec,
--
2.51.0
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