virtio_fs_rlimit_nofile: new case

1. Create a shared directory for testing on the host.
2. Touch 1024 files in the shared directory.
3. Start the virtiofsd daemon with rlimit-nofile and check.

Signed-off-by: Tingting Mao <[email protected]>

Author: hellohellenmao

qemu/tests/cfg/virtio_fs_rlimit_nofile.cfg

@@ -0,0 +1,98 @@
+- virtio_fs_rlimit_nofile:
+    only Linux
+    no RHEL.6 RHEL.7 RHEL.8.0 RHEL.8.1
+    no Host_RHEL.m6 Host_RHEL.m7 Host_RHEL.m8.u0 Host_RHEL.m8.u1
+    type = virtio_fs_rlimit_nofile
+    required_virtiofsd_version = [1.13.2-1,)
+    virtiofsd_version_cmd = rpm -q virtiofsd | cut -d- -f2
+    Win10.i386:
+        mem = 4096
+    fs_source_dir = /var/tmp/virtiofs_rlimit_nofile
+    force_create_fs_source = yes
+    remove_fs_source = yes
+
+    pre_command = "cd ${fs_source_dir}"
+    pre_command += " && for i in $(seq 1 1024); do touch file_$i.txt; done"
+    virtiofs_socket_path = '/var/tmp/virtiofs_rlimit_nofile.sock'
+    cmd_run_virtiofsd = '/usr/libexec/virtiofsd --socket-path ${virtiofs_socket_path} --shared-dir ${fs_source_dir}'
+    
+    vm_mem_share = yes
+    vm_mem_backend = memory-backend-file
+    vm_mem_backend_path = /dev/shm
+    share_mem = yes
+    !s390, s390x:
+        mem_devs = mem1
+        backend_mem_mem1 = memory-backend-file
+        mem-path_mem1 = /dev/shm
+        size_mem1 = ${mem}M
+        use_mem_mem1 = no
+        guest_numa_nodes = shm0
+        numa_memdev_shm0 = mem-mem1
+        numa_nodeid_shm0 = 0
+    Windows:
+        # install winfsp tool
+        i386, i686:
+            install_winfsp_path = 'C:\Program Files'
+            devcon_dirname = 'x86'
+        x86_64:
+            install_winfsp_path = 'C:\Program Files (x86)'
+            devcon_dirname = 'amd64'
+        install_winfsp_cmd = 'msiexec /i WIN_UTILS:\winfsp.msi /qn'
+        check_installed_cmd = 'dir "%s" |findstr /I winfsp'
+        viofs_log_file = C:\viofs_log.txt
+        viofs_svc_name = VirtioFsSvc
+        viofs_exe_path = C:\virtiofs.exe
+        viofs_exe_copy_cmd = xcopy %s C:\ /Y
+        viofs_sc_create_cmd = 'sc create ${viofs_svc_name} binpath=${viofs_exe_path} start=auto'
+        viofs_sc_create_cmd += ' depend="WinFsp.Launcher/VirtioFsDrv" DisplayName="Virtio FS Service"'
+        viofs_sc_start_cmd = 'sc start ${viofs_svc_name}'
+        viofs_sc_query_cmd = 'sc query ${viofs_svc_name}'
+        viofs_sc_delete_cmd = 'sc delete ${viofs_svc_name}'
+        debug_log_operation = 'enable'
+        viofs_debug_enable_cmd = 'reg add HKLM\Software\VirtIO-FS /v DebugFlags /d 0xFFFFFFFF /t REG_DWORD'
+        viofs_log_enable_cmd = 'reg add HKLM\Software\VirtIO-FS /v DebugLogFile /d ${viofs_log_file} /t REG_SZ'
+        viofs_debug_delete_cmd = 'reg delete HKLM\Software\VirtIO-FS /v DebugFlags /f'
+        viofs_log_delete_cmd = 'reg delete HKLM\Software\VirtIO-FS /v DebugLogFile /f'
+        viofs_reg_query_cmd = 'reg query HKLM\Software\VirtIO-FS'
+        virtio_win_media_type = iso
+        cdroms += " virtio"
+        check_str = 'A device attached to the system is not functioning'
+        read_file_cmd = "type %s\${test_file}"
+        write_file_cmd = "echo new_${test_data} > %s\${test_file}"
+    variants:
+        - rlimit_nofile_512:
+            rlimit_nofile = 512 
+            cmd_run_virtiofsd += " --rlimit-nofile ${rlimit_nofile}"
+            expected_msg = "Maximum number of file descriptors too small: Limit is 512, must be at least 610"
+        - rlimit_nofile_610:
+            rlimit_nofile = 610
+            cmd_run_virtiofsd += " --rlimit-nofile ${rlimit_nofile}"
+            expected_msg = "File descriptor count limit is very small, leaving only 0 file descriptors for the guest"
+        - rlimit_nofile_1024:
+            kill_vm = yes
+            start_vm = yes
+            filesystems = fs
+            fs_driver = virtio-fs
+            fs_source_type = mount
+            force_create_fs_source = yes
+            remove_fs_source = yes
+            fs_target = 'myfs'
+            fs_driver_props = {"queue-size": 1024}
+            fs_dest = '/mnt/${fs_target}'
+            driver_name = viofs
+            rlimit_nofile = 1024
+            fs_binary_extra_options += " --rlimit-nofile ${rlimit_nofile}"
+        - rlimit_nofile_2048:
+            kill_vm = yes
+            start_vm = yes
+            filesystems = fs
+            fs_driver = virtio-fs
+            fs_source_type = mount
+            force_create_fs_source = yes
+            remove_fs_source = yes
+            fs_target = 'myfs'
+            fs_driver_props = {"queue-size": 1024}
+            fs_dest = '/mnt/${fs_target}'
+            driver_name = viofs
+            rlimit_nofile = 2048
+            fs_binary_extra_options += " --rlimit-nofile ${rlimit_nofile}"

qemu/tests/virtio_fs_rlimit_nofile.py

@@ -0,0 +1,71 @@
+import aexpect
+from virttest import error_context
+from avocado.utils import process
+from virttest import env_process, error_context, utils_disk, utils_misc, utils_test
+
+
+@error_context.context_aware
+def run(test, params, env):
+    """
+    Test virtio-fs rlimit-nofile.
+    Steps:
+        1. Create a shared directory for testing on the host.
+        2. Touch 1024 files in the shared directory.
+        3. Start the virtiofsd daemon with rlimit-nofile and check.
+
+    :param test: QEMU test object.
+    :param params: Dictionary with the test parameters.
+    :param env: Dictionary with test environment.
+    """
+    rlimit_nofile = params.get("rlimit_nofile")
+    cmd_run_virtiofsd = params["cmd_run_virtiofsd"]
+
+    if rlimit_nofile == "512":
+        expected_msg = params["expected_msg"]
+        error_context.context(
+            "Starting virtiofsd with rlimit-nofile=%s" % rlimit_nofile,
+            test.log.info)
+        result = process.run(
+            cmd_run_virtiofsd,
+            shell=True,
+            ignore_status=True,
+            verbose=True,
+        )
+        status, out = result.exit_status, result.stdout.decode()
+        if status == 0:
+            test.fail("virtiofsd unexpectedly started successfully with rlimit-nofile=512")
+        elif expected_msg not in out:
+            test.fail(
+                "virtiofsd failed but without expected message. Output: %s" % out)
+        error_context.context(
+            "virtiofsd failed as expected with the required message present",
+            test.log.info)
+    elif rlimit_nofile == "610":
+        expected_msg = params["expected_msg"]
+        error_context.context(
+            "Starting virtiofsd with rlimit-nofile=%s" % rlimit_nofile,
+            test.log.info)
+        session = aexpect.ShellSession(
+            cmd_run_virtiofsd,
+            auto_close=False,
+            output_func=utils_misc.log_line,
+            output_params=("virtiofs_fs-virtiofs.log",),
+            prompt=r"^\[.*\][\#\$]\s*$",
+        )
+        try:
+            session.expect(expected_msg, timeout=10)
+            test.log.info("virtiofsd started successfully with the required message present")
+        except aexpect.ExpectTimeout as e:
+            test.fail("Timeout for virtiofsd start with rlimit-nofile=610: %s" % e)
+        finally:
+            session.close()
+    elif rlimit_nofile == "1024":
+        error_context.context(
+            "Starting virtiofsd with rlimit-nofile=%s" % rlimit_nofile,
+            test.log.info)
+        vm = env.get_vm(params.get("main_vm"))
+        vm.verify_alive()
+        session = vm.wait_for_login()
+        session.close()
+    else:
+        test.fail("Invalid rlimit-nofile: %s" % rlimit_nofile)