[LTP] [PATCH 1/1] nfs/nfs08.sh: Add test for NFS cache invalidation

[Petr Vorel]

v4 [1] of not yet upstreamed patch accidentally broke cache invalidation
for directories by clearing NFS_INO_INVALID_DATA inappropriately.
Although it was fixed in v5 [2] thus kernel was not actually broken,
it's better to prevent this in the future.

[1] https://lore.kernel.org/linux-nfs/167649314509.15170.15885497881041431304@noble.neil.brown.name/
[2] https://lore.kernel.org/linux-nfs/167943762461.8008.3152357340238024342@noble.neil.brown.name/

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
NOTE: although Neil suggested to test on ext2 to make the problems more
obvious (ext2 has low-resolution time stamps) and to use sleep, with
nfs_lib.sh LTP code it works without sleep and on all filesystems.

It'd require more changes in nfs_lib.sh to force ext2 only for nfs08.sh
(other tests are using the library). Not only it's needed, but I also
plan to switch nfs_lib.sh to use all available filesystems via
TST_ALL_FILESYSTEMS=1, therefore ext2 will be among tested filesystems
anyway.

Test fails also on all available NFS versions, thus using the same
approach as the other tests - test all versions, although not sure if
it's really needed. But test runs very quickly (unlike other nfs tests
it's not a stress test), thus I'd keep it.

NOTE: anybody trying to test this patch with TMPDIR (to test different
filesystems) test with this fix [1].

Kind regards,
Petr

[1] https://lore.kernel.org/ltp/20230412073953.1983857-1-pvorel@suse.cz/

 runtest/net.nfs                           | 11 +++++++++++
 testcases/network/nfs/nfs_stress/Makefile |  9 +--------
 testcases/network/nfs/nfs_stress/nfs08.sh | 20 ++++++++++++++++++++
 3 files changed, 32 insertions(+), 8 deletions(-)
 create mode 100755 testcases/network/nfs/nfs_stress/nfs08.sh

diff --git a/runtest/net.nfs b/runtest/net.nfs
index 3249c35cb..72cf4b307 100644
--- a/runtest/net.nfs
+++ b/runtest/net.nfs
@@ -72,6 +72,17 @@ nfs4_ipv6_07 nfs07.sh -6 -v 4 -t tcp
 nfs41_ipv6_07 nfs07.sh -6 -v 4.1 -t tcp
 nfs42_ipv6_07 nfs07.sh -6 -v 4.2 -t tcp
 
+nfs3_08 nfs08.sh -v 3 -t udp
+nfs3t_08 nfs08.sh -v 3 -t tcp
+nfs4_08 nfs08.sh -v 4 -t tcp
+nfs41_08 nfs08.sh -v 4.1 -t tcp
+nfs42_08 nfs08.sh -v 4.2 -t tcp
+nfs3_ipv6_08 nfs08.sh -6 -v 3 -t udp
+nfs3t_ipv6_08 nfs08.sh -6 -v 3 -t tcp
+nfs4_ipv6_08 nfs08.sh -6 -v 4 -t tcp
+nfs41_ipv6_08 nfs08.sh -6 -v 4.1 -t tcp
+nfs42_ipv6_08 nfs08.sh -6 -v 4.2 -t tcp
+
 nfslock3_01 nfslock01.sh -v 3 -t udp
 nfslock3t_01 nfslock01.sh -v 3 -t tcp
 nfslock4_01 nfslock01.sh -v 4 -t tcp
diff --git a/testcases/network/nfs/nfs_stress/Makefile b/testcases/network/nfs/nfs_stress/Makefile
index 8cd095867..5b396dede 100644
--- a/testcases/network/nfs/nfs_stress/Makefile
+++ b/testcases/network/nfs/nfs_stress/Makefile
@@ -9,13 +9,6 @@ include $(top_srcdir)/include/mk/testcases.mk
 nfs04_create_file: CPPFLAGS += -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
 nfs05_make_tree: LDLIBS += -lpthread
 
-INSTALL_TARGETS		:= nfs_lib.sh \
-			   nfs01.sh \
-			   nfs02.sh \
-			   nfs03.sh \
-			   nfs04.sh \
-			   nfs05.sh \
-			   nfs06.sh \
-			   nfs07.sh
+INSTALL_TARGETS	:= *.sh
 
 include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/network/nfs/nfs_stress/nfs08.sh b/testcases/network/nfs/nfs_stress/nfs08.sh
new file mode 100755
index 000000000..8a0f40242
--- /dev/null
+++ b/testcases/network/nfs/nfs_stress/nfs08.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2023 Petr Vorel <pvorel@suse.cz>
+# Test reproducer for broken NFS cache invalidation for directories.
+# Based on reproducer from Neil Brown <neilb@suse.de>
+
+TST_TESTFUNC="do_test"
+
+do_test()
+{
+	tst_res TINFO "testing NFS cache invalidation for directories"
+
+	touch 1
+	EXPECT_PASS 'ls | grep 1'
+	touch 2
+	EXPECT_PASS 'ls | grep 2'
+}
+
+. nfs_lib.sh
+tst_run
-- 
2.40.0