[LTP] [PATCH v3 2/3] Add minimum kernel requirement for FS setup

[Cyril Hrubis]

Hi!
> 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 192fee309..fe07c4d98 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)
>  				ret = tst_check_cmd(tst_test->filesystems->mkfs_ver, 0);
>  
> +			if (tst_test->filesystems->min_kver)
> +				ret = check_kver(tst_test->filesystems->min_kver, 0);

Here as well, we should pass 1 as the last argument.

>  			if (ret)
>  				return;
>  
> @@ -1816,6 +1828,9 @@ 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..6b714c51c 100644
> --- a/testcases/lib/tst_run_shell.c
> +++ b/testcases/lib/tst_run_shell.c
> @@ -156,6 +156,7 @@ enum fs_ids {
>  	MKFS_VER,
>  	MNT_FLAGS,
>  	TYPE,
> +	FS_MIN_KVER,
>  };
>  
>  static ujson_obj_attr fs_attrs[] = {
> @@ -164,6 +165,7 @@ static ujson_obj_attr fs_attrs[] = {
>  	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),
> +	UJSON_OBJ_ATTR_IDX(FS_MIN_KVER, "min_kver", UJSON_STR),

This is stil not sorted properly, the min_kver should go before the
mkfs_ver.

-- 
Cyril Hrubis
chrubis@suse.cz