[LTP] [PATCH v4 2/3] Add minimum kernel requirement for FS setup

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

In some cases, a filesystem that is going to be created and mounted
by LTP can't be supported by certain kernel versions. This is the case
of the CoW support: mkfs creates a CoW filesystem, while underlying
kernel can't mount it.

To cover this scenario, a new flag called .min_kver has been
introduced in the tst_fs structure, giving the user a possibility to
filter out certain kernels not supporting certain FS features.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 include/tst_test.h            |  5 +++++
 lib/tst_test.c                | 27 +++++++++++++++++++++------
 testcases/lib/tst_run_shell.c |  5 +++++
 3 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/include/tst_test.h b/include/tst_test.h
index 38d24f48c..8d1819f74 100644
--- a/include/tst_test.h
+++ b/include/tst_test.h
@@ -270,6 +270,9 @@ struct tst_ulimit_val {
  *
  * @mnt_data: The data passed to mount(2) when the test library mounts a device
  *            in the case of 'tst_test.mount_device'.
+ *
+ * @min_kver: A minimum kernel version supporting the filesystem which has been
+ *            created with mkfs.
  */
 struct tst_fs {
 	const char *type;
@@ -280,6 +283,8 @@ struct tst_fs {
 
 	unsigned int mnt_flags;
 	const void *mnt_data;
+
+	const char *min_kver;
 };
 
 /**
diff --git a/lib/tst_test.c b/lib/tst_test.c
index 4f4a53080..61903100f 100644
--- a/lib/tst_test.c
+++ b/lib/tst_test.c
@@ -950,20 +950,29 @@ static void do_exit(int ret)
 	exit(ret);
 }
 
-void check_kver(void)
+int check_kver(const char *min_kver, const int brk_nosupp)
 {
+	char *msg;
 	int v1, v2, v3;
 
-	if (tst_parse_kver(tst_test->min_kver, &v1, &v2, &v3)) {
+	if (tst_parse_kver(min_kver, &v1, &v2, &v3)) {
 		tst_res(TWARN,
 			"Invalid kernel version %s, expected %%d.%%d.%%d",
-			tst_test->min_kver);
+			min_kver);
 	}
 
 	if (tst_kvercmp(v1, v2, v3) < 0) {
-		tst_brk(TCONF, "The test requires kernel %s or newer",
-			tst_test->min_kver);
+		msg = "The test requires kernel %s or newer";
+
+		if (brk_nosupp)
+			tst_brk(TCONF, msg, min_kver);
+		else
+			tst_res(TCONF, msg, min_kver);
+
+		return 1;
 	}
+
+	return 0;
 }
 
 static int results_equal(struct results *a, struct results *b)
@@ -1289,7 +1298,7 @@ static void do_setup(int argc, char *argv[])
 		tst_brk(TCONF, "Test needs to be run as root");
 
 	if (tst_test->min_kver)
-		check_kver();
+		check_kver(tst_test->min_kver, 1);
 
 	if (tst_test->supported_archs && !tst_is_on_arch(tst_test->supported_archs))
 		tst_brk(TCONF, "This arch '%s' is not supported for test!", tst_arch.name);
@@ -1420,6 +1429,9 @@ static void do_setup(int argc, char *argv[])
 			if (tst_test->filesystems->mkfs_ver)
 				tst_check_cmd(tst_test->filesystems->mkfs_ver, 1);
 
+			if (tst_test->filesystems->min_kver)
+				check_kver(tst_test->filesystems->min_kver, 1);
+
 			prepare_device(tst_test->filesystems);
 		}
 	}
@@ -1813,6 +1825,9 @@ static int run_tcase_on_fs(struct tst_fs *fs, const char *fs_type)
 	if (fs->mkfs_ver && tst_check_cmd(fs->mkfs_ver, 0))
 		return TCONF;
 
+	if (fs->min_kver && check_kver(fs->min_kver, 0))
+		return TCONF;
+
 	prepare_device(fs);
 
 	ret = fork_testrun();
diff --git a/testcases/lib/tst_run_shell.c b/testcases/lib/tst_run_shell.c
index ee029b666..e871760e2 100644
--- a/testcases/lib/tst_run_shell.c
+++ b/testcases/lib/tst_run_shell.c
@@ -156,11 +156,13 @@ enum fs_ids {
 	MKFS_VER,
 	MNT_FLAGS,
 	TYPE,
+	FS_MIN_KVER,
 };
 
 static ujson_obj_attr fs_attrs[] = {
 	UJSON_OBJ_ATTR_IDX(MKFS_OPTS, "mkfs_opts", UJSON_ARR),
 	UJSON_OBJ_ATTR_IDX(MKFS_SIZE_OPT, "mkfs_size_opt", UJSON_STR),
+	UJSON_OBJ_ATTR_IDX(FS_MIN_KVER, "min_kver", UJSON_STR),
 	UJSON_OBJ_ATTR_IDX(MKFS_VER, "mkfs_ver", UJSON_STR),
 	UJSON_OBJ_ATTR_IDX(MNT_FLAGS, "mnt_flags", UJSON_ARR),
 	UJSON_OBJ_ATTR_IDX(TYPE, "type", UJSON_STR),
@@ -235,6 +237,9 @@ static struct tst_fs *parse_filesystems(ujson_reader *reader, ujson_val *val)
 			case TYPE:
 				ret[i].type = strdup(val->val_str);
 			break;
+			case FS_MIN_KVER:
+				ret[i].min_kver = strdup(val->val_str);
+			break;
 			}
 
 		}

-- 
2.43.0