[LTP] [PATCH 2/2] mount_setattr01: add open_tree_attr variant

[Wei Gao]

On Thu, Aug 28, 2025 at 03:11:25PM +0200, Andrea Cervesato wrote:
> From: Andrea Cervesato <andrea.cervesato@suse.com>
> 
> This patch simply introduces a new variant to the mount_setattr01
> test, in order to verify that open_tree_attr() works correctly.
> The open_tree_attr() syscall has been introduced in the kernel v6.15 by
> commit "c4a16820d901 - fs: add open_tree_attr()".
> 
> Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
> ---
>  .../syscalls/mount_setattr/mount_setattr01.c       | 69 ++++++++++++++++------
>  1 file changed, 52 insertions(+), 17 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/mount_setattr/mount_setattr01.c b/testcases/kernel/syscalls/mount_setattr/mount_setattr01.c
> index eb32cd91a7fcb4cb303e184dd40d5e10a280874c..bede26318a6985339b5b4bbb2db4a91744110eda 100644
> --- a/testcases/kernel/syscalls/mount_setattr/mount_setattr01.c
> +++ b/testcases/kernel/syscalls/mount_setattr/mount_setattr01.c
> @@ -3,10 +3,11 @@
>   * Copyright (c) 2022 FUJITSU LIMITED. All rights reserved.
>   * Author: Dai Shili <daisl.fnst@fujitsu.com>
>   * Author: Chen Hanxiao <chenhx.fnst@fujitsu.com>
> + * Copyright (C) 2025 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
>   */
>  
>  /*\
> - * Basic mount_setattr() test.
> + * Basic mount_setattr()/open_tree_attr() test.
>   * Test whether the basic mount attributes are set correctly.
>   *
>   * Verify some MOUNT_SETATTR(2) attributes:
> @@ -22,7 +23,8 @@
>   * - MOUNT_ATTR_NODIRATIME - prevents updating access time for
>   *   directories on this mount
>   *
> - * The functionality was added in v5.12.
> + * The mount_setattr functionality was added in v5.12, while the open_tree_attr
> + * functionality was added in v6.15.
>   */
>  
>  #define _GNU_SOURCE
> @@ -41,6 +43,7 @@
>  	}
>  
>  static int mount_flag, otfd = -1;
> +struct mount_attr *attr;
>  
>  static struct tcase {
>  	char *name;
> @@ -66,35 +69,59 @@ static void cleanup(void)
>  static void setup(void)
>  {
>  	fsopen_supported_by_kernel();
> -	struct stat st = {0};
>  
> -	if (stat(OT_MNTPOINT, &st) == -1)
> +	if (access(OT_MNTPOINT, F_OK) != 0)
>  		SAFE_MKDIR(OT_MNTPOINT, 0777);
>  }
>  
> +static int open_tree_variant1(struct mount_attr *attr)
> +{
> +	tst_res(TINFO, "Variant using open_tree() + mount_setattr()");
> +
> +	otfd = TST_EXP_FD(open_tree(AT_FDCWD, MNTPOINT,
> +			AT_EMPTY_PATH | OPEN_TREE_CLONE));
> +	if (otfd == -1)
> +		return -1;
> +
> +	TST_EXP_PASS(mount_setattr(otfd, "", AT_EMPTY_PATH,
> +			attr, sizeof(*attr)));
Duplicate mount_setattr? There is another mount_setattr after this
called.
> +	if (TST_RET == -1)
> +		return -1;
> +
> +	return otfd;
> +}
> +
> +static int open_tree_variant2(struct mount_attr *attr)
> +{
> +	tst_res(TINFO, "Variant using open_tree_attr()");
> +
> +	otfd = TST_EXP_FD(open_tree_attr(AT_FDCWD, MNTPOINT,
> +			AT_EMPTY_PATH | OPEN_TREE_CLONE,
> +			attr, sizeof(*attr)));
> +
> +	return otfd;
> +}
> +
>  static void run(unsigned int n)
>  {
>  	struct tcase *tc = &tcases[n];
> -	struct mount_attr attr = {
> -		.attr_set = tc->mount_attrs,
> -	};
>  	struct statvfs buf;
>  
> -	TST_EXP_FD_SILENT(open_tree(AT_FDCWD, MNTPOINT, AT_EMPTY_PATH |
> -		AT_SYMLINK_NOFOLLOW | OPEN_TREE_CLOEXEC | OPEN_TREE_CLONE));
> -	if (!TST_PASS)
> -		return;
> +	memset(attr, 0, sizeof(*attr));
> +	attr->attr_set = tc->mount_attrs;
>  
> -	otfd = (int)TST_RET;
> +	if (tst_variant)
> +		otfd = open_tree_variant1(attr);
> +	else
> +		otfd = open_tree_variant2(attr);
I am not sure this is perfect way loop the function, add function point into struct tcase
is better in my opinion.
>  
> -	TST_EXP_PASS_SILENT(mount_setattr(otfd, "", AT_EMPTY_PATH, &attr, sizeof(attr)),
> -		"%s set", tc->name);
> -	if (!TST_PASS)
> -		goto out1;
> +	if (otfd == -1)
> +		goto out2;
>  
>  	TST_EXP_PASS_SILENT(move_mount(otfd, "", AT_FDCWD, OT_MNTPOINT, MOVE_MOUNT_F_EMPTY_PATH));
I suppose we can also check mounts option take effect or not like:
https://patchwork.ozlabs.org/project/ltp/patch/20250828225157.982-1-wegao@suse.com/
>  	if (!TST_PASS)
>  		goto out1;
> +
>  	mount_flag = 1;
>  	SAFE_CLOSE(otfd);
>  
> @@ -123,9 +150,17 @@ static struct tst_test test = {
>  	.test = run,
>  	.setup = setup,
>  	.cleanup = cleanup,
> +	.test_variants = 2,
>  	.needs_root = 1,
>  	.mount_device = 1,
>  	.mntpoint = MNTPOINT,
>  	.all_filesystems = 1,
> -	.skip_filesystems = (const char *const []){"fuse", NULL},
> +	.skip_filesystems = (const char *const []) {
> +		"fuse",
> +		NULL
> +	},
> +	.bufs = (struct tst_buffers []) {
> +		{&attr, .size = sizeof(struct mount_attr)},
> +		{}
> +	}
>  };
> 
> -- 
> 2.51.0
> 
> 
> -- 
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