[RFT] ltp: add support for running tests on NFS mounts

[Luis Chamberlain <mcgrof@kernel.org>]

Add support for running LTP tests on NFS/pNFS mounts when
both CONFIG_LTP_TESTS_NFS and CONFIG_KDEVOPS_SETUP_NFSD are enabled.

Changes include:

1. Add CONFIG_LTP_RUN_TESTS_ON_NFS option to control NFS mount testing
   - Depends on both NFS test group and NFS server being enabled
   - Defaults to enabled when dependencies are met

2. Extend KDEVOPS_SETUP_NFSD dependencies to include LTP workflow
   - Allows NFS server setup for LTP testing scenarios

3. Enhance LTP role with NFS mount capability:
   - Mount NFS exports from kdevops NFS server before running tests
   - Run LTP tests in NFS mount directory (/mnt/nfs-ltp/ltp-test)
   - Use NFS v4.2 for comprehensive pNFS testing

4. Update nfs-ltp defconfig to enable full pNFS testing:
   - Enable NFS test group (CONFIG_LTP_TESTS_NFS=y)
   - Enable NFS server setup (CONFIG_KDEVOPS_SETUP_NFSD=y)
   - Enable NFS mount testing (CONFIG_LTP_RUN_TESTS_ON_NFS=y)

This enables real pNFS testing where LTP tests execute on actual NFS
mounts, providing comprehensive validation of NFS client functionality
including parallel NFS capabilities.

Generated-by: Claude AI
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---

Chuck indicated LTP isn't exactly testing NFS, and indeed one needs
to manually arrange things to test LTP. But it'd be nice to just
leverage a defconfig and that's it. This will be useful for automation.

This requires further testing. I ran out of time.

 defconfigs/nfs-ltp                 | 18 ++++++-
 kconfigs/Kconfig.nfsd              |  7 +--
 playbooks/roles/ltp/tasks/main.yml | 77 +++++++++++++++++++++++++++++-
 workflows/ltp/Kconfig              | 12 +++++
 workflows/ltp/Makefile             |  6 +++
 5 files changed, 114 insertions(+), 6 deletions(-)

diff --git a/defconfigs/nfs-ltp b/defconfigs/nfs-ltp
index 4562874e..b7a9f4cd 100644
--- a/defconfigs/nfs-ltp
+++ b/defconfigs/nfs-ltp
@@ -1,5 +1,13 @@
 # pNFS configuration for Linux Test Project (LTP)
-# Note: LTP doesn't specifically test pNFS, but can run on pNFS mounts
+#
+# This defconfig sets up LTP to run tests over pNFS (parallel NFS) mounts.
+# It configures:
+# 1. An NFS server node with exports (via CONFIG_KDEVOPS_SETUP_NFSD)
+# 2. LTP with NFS test group enabled (CONFIG_LTP_TESTS_NFS)
+# 3. Automatic NFS mount setup to run tests on NFS (CONFIG_LTP_RUN_TESTS_ON_NFS)
+#
+# The LTP tests will execute on NFS v4.2 mounts, providing comprehensive
+# testing of NFS client functionality including pNFS capabilities.
 
 # Use libvirt/QEMU for virtualization
 CONFIG_GUESTFS=y
@@ -24,8 +32,14 @@ CONFIG_WORKFLOWS_DEDICATED_WORKFLOW=y
 CONFIG_KDEVOPS_WORKFLOW_DEDICATE_LTP=y
 CONFIG_KDEVOPS_WORKFLOW_ENABLE_LTP=y
 
-# Use kdevops-provided NFS server for pNFS mount
+# Enable NFS test group for pNFS testing
+CONFIG_LTP_TESTS_NFS=y
+
+# NFS server setup for pNFS testing
 CONFIG_KDEVOPS_SETUP_NFSD=y
 
+# Run LTP tests on NFS mounts (enables actual pNFS testing)
+CONFIG_LTP_RUN_TESTS_ON_NFS=y
+
 # Enable systemd journal remote for debugging
 CONFIG_DEVCONFIG_ENABLE_SYSTEMD_JOURNAL_REMOTE=y
\ No newline at end of file
diff --git a/kconfigs/Kconfig.nfsd b/kconfigs/Kconfig.nfsd
index 8463e531..b5f20416 100644
--- a/kconfigs/Kconfig.nfsd
+++ b/kconfigs/Kconfig.nfsd
@@ -2,9 +2,10 @@
 config KDEVOPS_SETUP_NFSD
 	bool "Set up the kernel nfs server"
 	depends on KDEVOPS_WORKFLOW_ENABLE_FSTESTS || \
-			   KDEVOPS_WORKFLOW_ENABLE_PYNFS || \
-			   KDEVOPS_WORKFLOW_ENABLE_NFSTEST || \
-			   KDEVOPS_WORKFLOW_ENABLE_GITR
+		KDEVOPS_WORKFLOW_ENABLE_PYNFS || \
+		KDEVOPS_WORKFLOW_ENABLE_NFSTEST || \
+		KDEVOPS_WORKFLOW_ENABLE_GITR || \
+		KDEVOPS_WORKFLOW_ENABLE_LTP
 	default n
 	help
 	  Configure and bring up the kernel NFS server. This will provision
diff --git a/playbooks/roles/ltp/tasks/main.yml b/playbooks/roles/ltp/tasks/main.yml
index 1b966771..3335f018 100644
--- a/playbooks/roles/ltp/tasks/main.yml
+++ b/playbooks/roles/ltp/tasks/main.yml
@@ -248,7 +248,64 @@
     state: reloaded
     enabled: true
 
-- name: Run ltp
+# NFS mount support for running LTP tests on NFS
+- name: Set NFS server address
+  tags: ["ltp", "run_tests"]
+  ansible.builtin.set_fact:
+    nfs_server_host: "{{ kdevops_host_prefix }}-nfs"
+  when:
+    - ltp_run_tests_on_nfs|default(false)|bool
+
+- name: Create NFS mount point for LTP tests
+  tags: ["ltp", "run_tests"]
+  become: true
+  become_flags: "su - -c"
+  become_method: ansible.builtin.sudo
+  ansible.builtin.file:
+    path: "/mnt/nfs-ltp"
+    state: directory
+    mode: "0755"
+  when:
+    - ltp_run_tests_on_nfs|default(false)|bool
+
+- name: Mount NFS export for LTP testing
+  tags: ["ltp", "run_tests"]
+  become: true
+  become_flags: "su - -c"
+  become_method: ansible.builtin.sudo
+  ansible.builtin.mount:
+    path: "/mnt/nfs-ltp"
+    src: "{{ nfs_server_host }}:{{ nfsd_export_path }}/0"
+    fstype: "nfs"
+    opts: "vers=4.2"
+    state: mounted
+  when:
+    - ltp_run_tests_on_nfs|default(false)|bool
+
+- name: Create LTP test directory on NFS mount
+  tags: ["ltp", "run_tests"]
+  become: true
+  become_flags: "su - -c"
+  become_method: ansible.builtin.sudo
+  ansible.builtin.file:
+    path: "/mnt/nfs-ltp/ltp-test"
+    state: directory
+    mode: "0777"
+  when:
+    - ltp_run_tests_on_nfs|default(false)|bool
+
+- name: Change to NFS mount directory for LTP tests
+  tags: ["run_tests"]
+  become: true
+  become_flags: "su - -c"
+  become_method: ansible.builtin.sudo
+  ansible.builtin.shell: |
+    cd /mnt/nfs-ltp/ltp-test
+    pwd
+  when:
+    - ltp_run_tests_on_nfs|default(false)|bool
+
+- name: Run ltp on local filesystem
   tags: ["run_tests"]
   become: true
   become_flags: "su - -c"
@@ -259,6 +316,24 @@
     cmd: "/opt/ltp/runltp {{ ltp_runltp_arg_dict[ltp_test_group] }}"
   changed_when: true
   failed_when: false
+  when:
+    - not ltp_run_tests_on_nfs|default(false)|bool
+
+- name: Run ltp on NFS mount
+  tags: ["run_tests"]
+  become: true
+  become_flags: "su - -c"
+  become_method: ansible.builtin.sudo
+  environment:
+    CREATE_ENTRIES: 1
+    TMPDIR: "/mnt/nfs-ltp/ltp-test"
+  ansible.builtin.command:
+    cmd: "/opt/ltp/runltp -d /mnt/nfs-ltp/ltp-test {{ ltp_runltp_arg_dict[ltp_test_group] }}"
+    chdir: "/mnt/nfs-ltp/ltp-test"
+  changed_when: true
+  failed_when: false
+  when:
+    - ltp_run_tests_on_nfs|default(false)|bool
 
 - name: Look for test results in target node's /opt/ltp/results
   tags: ["copy_results"]
diff --git a/workflows/ltp/Kconfig b/workflows/ltp/Kconfig
index 8b01dfb6..f6600394 100644
--- a/workflows/ltp/Kconfig
+++ b/workflows/ltp/Kconfig
@@ -61,6 +61,18 @@ config LTP_TESTS_TIRPC
 
 endmenu
 
+config LTP_RUN_TESTS_ON_NFS
+	bool "Run LTP tests on NFS mounts"
+	depends on LTP_TESTS_NFS && KDEVOPS_SETUP_NFSD
+	default y
+	help
+	  When enabled, LTP tests will be run on NFS mounts instead of
+	  local filesystems. This requires both NFS test group to be enabled
+	  and kdevops NFS server to be configured.
+
+	  The tests will mount NFS exports from the kdevops NFS server
+	  and run the LTP test suite on those mounts.
+
 endif # WORKFLOWS_DEDICATED_WORKFLOW
 
 config HAVE_MIRROR_LTP
diff --git a/workflows/ltp/Makefile b/workflows/ltp/Makefile
index 592c4f2b..02a43bb9 100644
--- a/workflows/ltp/Makefile
+++ b/workflows/ltp/Makefile
@@ -82,6 +82,12 @@ else
 LTP_ARGS += ltp_tests_tirpc='False'
 endif # CONFIG_LTP_TESTS_TIRPC
 
+ifeq (y,$(CONFIG_LTP_RUN_TESTS_ON_NFS))
+LTP_ARGS += ltp_run_tests_on_nfs='True'
+else
+LTP_ARGS += ltp_run_tests_on_nfs='False'
+endif # CONFIG_LTP_RUN_TESTS_ON_NFS
+
 WORKFLOW_ARGS += $(LTP_ARGS)
 WORKFLOW_ARGS_SEPARATED += ltp_enabled_test_groups='$(subst $(space),+,$(LTP_ENABLED_TEST_GROUPS))'
 
-- 
2.51.0