[LTP] [PATCH] nfs_lib: Skip NFS versions disabled on server

[LTP] [PATCH] nfs_lib: Skip NFS versions disabled on server

[Avinesh Kumar via ltp]

From: Avinesh Kumar <avinesh.kumar@suse.com>

nfs06.sh mount several NFS versions in a single run
(e.g. "3,4.0,4.1,4.2"). If the server has disabled one of
the requested versions (reported via /proc/fs/nfsd/versions),
the whole test currently aborts with TBROK on the failed mount
instead of continuing with the versions that are supported.

nfs06 1 TINFO: setup NFSv4.0, socket type tcp
nfs06 1 TINFO: Mounting /var/tmp/LTP_nfs06.GHDqCwPYES/4.0/1
nfs06 1 TINFO: Mounting NFS: mount -v -t nfs -o proto=tcp,vers=4.0 10.0.0.2:/var/tmp/LTP_nfs06.GHDqCwPYES/mntpoint/4.0/tcp /var/tmp/LTP_nfs06.GHDqCwPYES/4.0/1
mount.nfs: mount(2): Invalid argument
mount.nfs: an incorrect mount option was specified for /var/tmp/LTP_nfs06.GHDqCwPYES/4.0/1
mount.nfs: timeout set for Wed Aug  5 08:06:38 2026
mount.nfs: trying text-based options 'proto=tcp,vers=4.0,addr=10.0.0.2,clientaddr=10.0.0.1'
nfs06 1 TBROK: mount command failed

Add nfs_server_vers_enabled() to check /proc/fs/nfsd/versions on the
server, and nfs_filter_versions() to drop disabled versions from
$VERSION (keeping $SOCKET_TYPE aligned by position) before mounting.
If none of the requested versions are enabled, TCONF as before.

Signed-off-by: Avinesh Kumar <avinesh.kumar@suse.com>
---
 testcases/network/nfs/nfs_stress/nfs_lib.sh | 56 ++++++++++++++++++++-
 1 file changed, 54 insertions(+), 2 deletions(-)

diff --git a/testcases/network/nfs/nfs_stress/nfs_lib.sh b/testcases/network/nfs/nfs_stress/nfs_lib.sh
index 8bff3f23ae12..4065b000467e 100644
--- a/testcases/network/nfs/nfs_stress/nfs_lib.sh
+++ b/testcases/network/nfs/nfs_stress/nfs_lib.sh
@@ -55,19 +55,24 @@ TST_NEEDS_DRIVERS="nfsd"
 # debugging whether test failures are related to veth/netns).
 LTP_NFS_NETNS_USE_LO=${LTP_NFS_NETNS_USE_LO:-}
 
-get_socket_type()
+get_socket_type_raw()
 {
 	local t
 	local k=0
 	for t in $SOCKET_TYPE; do
 		if [ "$k" -eq "$1" ]; then
-			echo "${t}${TST_IPV6}"
+			echo "$t"
 			return
 		fi
 		k=$(( k + 1 ))
 	done
 }
 
+get_socket_type()
+{
+	echo "$(get_socket_type_raw "$1")${TST_IPV6}"
+}
+
 # directory mounted by NFS client
 get_local_dir()
 {
@@ -109,6 +114,51 @@ nfs_server_udp_enabled()
 	tst_rhost_run -c "grep -q \"^[# ]*udp *= *y\" /etc/nfs.conf $config"
 }
 
+# nfs_server_vers_enabled VERS
+# Only returns false (1) when the server explicitly lists "-VERS" in
+# /proc/fs/nfsd/versions. If that file is unavailable or doesn't mention
+# VERS at all, defaults to true so the mount is still attempted.
+nfs_server_vers_enabled()
+{
+	local vers="$1"
+	local versions=" $(tst_rhost_run -c 'cat /proc/fs/nfsd/versions 2>/dev/null') "
+
+	case "$versions" in
+	*" -$vers "*) return 1;;
+	esac
+
+	return 0
+}
+
+# Drops NFS versions the server explicitly disabled from $VERSION, keeping
+# $SOCKET_TYPE entries aligned by position with what remains.
+nfs_filter_versions()
+{
+	local v type
+	local n=0
+	local new_version=
+	local new_socket_type=
+
+	for v in $VERSION; do
+		type=$(get_socket_type_raw $n)
+
+		if nfs_server_vers_enabled "$v"; then
+			new_version="$new_version $v"
+			new_socket_type="$new_socket_type $type"
+		else
+			tst_res TINFO "NFSv$v disabled on server, skipping"
+		fi
+
+		n=$(( n + 1 ))
+	done
+
+	[ -z "$new_version" ] && \
+		tst_brk TCONF "none of the requested NFS versions ($VERSION) are enabled on server"
+
+	VERSION="${new_version# }"
+	SOCKET_TYPE="${new_socket_type# }"
+}
+
 nfs_setup_server()
 {
 	local remote_dir="$1"
@@ -198,6 +248,8 @@ nfs_setup()
 
 	tst_res TINFO "$(mount.nfs -V)"
 
+	nfs_filter_versions
+
 	for i in $VERSION; do
 		type=$(get_socket_type $n)
 		tst_res TINFO "setup NFSv$i, socket type $type"
-- 
2.55.0


-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

Re: [LTP] nfs_lib: Skip NFS versions disabled on server

[linuxtestproject.agent]

Hi Avinesh,

On 6 Aug 2026, Avinesh Kumar wrote:
> nfs_lib: Skip NFS versions disabled on server

Verdict - Reviewed

---
Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

-- 
Mailing list info: https://lists.linux.it/listinfo/ltp