[LTP] [PATCH v3 04/11] Add listmount01 test

[Cyril Hrubis]

Hi!
> --- /dev/null
> +++ b/testcases/kernel/syscalls/listmount/listmount01.c
> @@ -0,0 +1,66 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * This test verifies that listmount() is properly recognizing a mounted
> + * root directory using LSMT_ROOT flag.
> + *
> + * [Algorithm]
> + *
> + * * move into a new unshared namespace
> + * * mount() a root inside temporary folder and get its mount ID
> + * * get list of mounted IDs using listmount(LSMT_ROOT, ..)
> + * * verify that the root mount ID is the only mount ID present inside the list

Can we please use dashes here instead of asterisks? It's kind of hard to
read asterisk based list inside of C comments...

> + */
> +
> +#include "listmount.h"
> +#include "lapi/stat.h"
> +#include "lapi/sched.h"
> +
> +#define MNTPOINT "mntpoint"
> +#define LISTSIZE 32
> +
> +static uint64_t root_id;
> +
> +static void run(void)
> +{
> +	uint64_t list[LISTSIZE];
> +
> +	TST_EXP_POSITIVE(listmount(LSMT_ROOT, 0, list, LISTSIZE, 0));
> +	if (TST_RET == -1)
> +		return;
> +
> +	TST_EXP_EQ_LI(TST_RET, 1);
> +	TST_EXP_EQ_LI(list[0], root_id);
> +}
> +
> +static void setup(void)
> +{
> +	struct statx sx;
> +
> +	SAFE_UNSHARE(CLONE_NEWNS);
> +
> +	SAFE_CHROOT(MNTPOINT);
> +	SAFE_MOUNT("", "/", NULL, MS_REC | MS_PRIVATE, NULL);
> +	SAFE_STATX(AT_FDCWD, "/", 0, STATX_MNT_ID_UNIQUE, &sx);
> +
> +	root_id = sx.stx_mnt_id;
> +}
> +
> +static struct tst_test test = {
> +	.test_all = run,
> +	.setup = setup,
> +	.forks_child = 1,
> +	.min_kver = "6.8",
> +	.mount_device = 1,
> +	.mntpoint = MNTPOINT,
> +	.all_filesystems = 1,

I do not think that this makes sense to be run for all filesystems, the
listmount() syscall does not interact with any of the filesytem code at
all. It just loops over a list of mount points in the namespace.

> +	.skip_filesystems = (const char *const []) {
> +		"fuse",
> +		NULL
> +	},
> +};
> 
> -- 
> 2.35.3
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz