[LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Matthew R. Ochs via ltp]

LTP mounts ntfs via ntfs-3g (FUSE) rather than the kernel ntfs3
driver. ntfs-3g's ntfs_ioctl() returns EINVAL for any unhandled
ioctl, including FS_IOC_FSSETXATTR, so file_setattr() returns
EINVAL instead of the expected EOPNOTSUPP.

Add "ntfs" to skip_filesystems for the same reason "fuse" is
already skipped.

Signed-off-by: Matthew R. Ochs <mochs@nvidia.com>
---
 testcases/kernel/syscalls/file_attr/file_attr05.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/testcases/kernel/syscalls/file_attr/file_attr05.c b/testcases/kernel/syscalls/file_attr/file_attr05.c
index 6c1471da33e7..85b6cafc5f17 100644
--- a/testcases/kernel/syscalls/file_attr/file_attr05.c
+++ b/testcases/kernel/syscalls/file_attr/file_attr05.c
@@ -49,6 +49,7 @@ static struct tst_test test = {
 	.skip_filesystems = (const char *const []) {
 		"xfs",
 		"fuse", /* EINVAL is raised before EOPNOTSUPP */
+		"ntfs", /* mounted via ntfs-3g (FUSE), returns EINVAL */
 		"vfat", /* vfat is not implementing file_[set|get]attr */
 		NULL,
 	},
-- 
2.50.1


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Re: [LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Petr Vorel]

Hi Matthew,

> LTP mounts ntfs via ntfs-3g (FUSE) rather than the kernel ntfs3
> driver. ntfs-3g's ntfs_ioctl() returns EINVAL for any unhandled
> ioctl, including FS_IOC_FSSETXATTR, so file_setattr() returns
> EINVAL instead of the expected EOPNOTSUPP.

> Add "ntfs" to skip_filesystems for the same reason "fuse" is
> already skipped.

Reviewed-by: Petr Vorel <pvorel@suse.cz>
Good catch, thanks!

We did not notice, because we have ntfs3 blacklisted in openSUSE Tumbleweed:

cat /etc/modprobe.d/60-blacklist_fs-ntfs3.conf
# The ntfs3 file system is blacklisted by default because it isn't actively
# supported by SUSE.
blacklist ntfs3
# The filesystem can be un-blacklisted by running "modprobe ntfs3".
# See README.md in the suse-module-tools package for details.
install ntfs3 /usr/lib/module-init-tools/unblacklist ntfs3; /sbin/modprobe --ignore-install ntfs3

Therefore it works:
# ./file_attr05
...
tst_supported_fs_types.c:98: TINFO: Kernel supports ext2
tst_supported_fs_types.c:63: TINFO: mkfs.ext2 does exist
tst_supported_fs_types.c:98: TINFO: Kernel supports ext3
tst_supported_fs_types.c:63: TINFO: mkfs.ext3 does exist
tst_supported_fs_types.c:98: TINFO: Kernel supports ext4
tst_supported_fs_types.c:63: TINFO: mkfs.ext4 does exist
tst_supported_fs_types.c:157: TINFO: Skipping xfs as requested by the test
tst_supported_fs_types.c:98: TINFO: Kernel supports btrfs
tst_supported_fs_types.c:63: TINFO: mkfs.btrfs does exist
tst_supported_fs_types.c:106: TINFO: Skipping bcachefs because of FUSE blacklist
tst_supported_fs_types.c:157: TINFO: Skipping vfat as requested by the test
tst_supported_fs_types.c:98: TINFO: Kernel supports exfat
tst_supported_fs_types.c:63: TINFO: mkfs.exfat does exist
tst_supported_fs_types.c:133: TINFO: FUSE does support ntfs
tst_supported_fs_types.c:63: TINFO: mkfs.ntfs does exist
tst_supported_fs_types.c:165: TINFO: Skipping FUSE based ntfs as requested by the test
...

But if I force ntfs, it really fails due using ntfs3:
# LTP_FORCE_SINGLE_FS_TYPE=ntfs ./file_attr05
...
tst_supported_fs_types.c:199: TINFO: WARNING: force testing only ntfs
tst_test.c:1997: TINFO: === Testing on ntfs ===
tst_test.c:1295: TINFO: Formatting /dev/loop0 with ntfs opts='' extra opts=''
The partition start sector was not specified for /dev/loop0 and it could not be obtained automatically.  It has been set to 0.
The number of sectors per track was not specified for /dev/loop0 and it could not be obtained automatically.  It has been set to 0.
The number of heads was not specified for /dev/loop0 and it could not be obtained automatically.  It has been set to 0.
To boot from a device, Windows needs the 'partition start sector', the 'sectors per track' and the 'number of heads' to be set.
Windows will not be able to boot from this device.
tst_test.c:1307: TINFO: Mounting /dev/loop0 to /tmp/LTP_filWegMd2/mntpoint fstyp=ntfs flags=0
tst_test.c:1307: TINFO: Trying FUSE...
file_attr05.c:23: TFAIL: file_setattr(AT_FDCWD, FILEPATH, attr_set, FILE_ATTR_SIZE_LATEST, 0) expected EOPNOTSUPP: EINVAL (22)

Other way is if I remove blacklist and manually run 'modprobe ntfs3'.

> Signed-off-by: Matthew R. Ochs <mochs@nvidia.com>
> ---
>  testcases/kernel/syscalls/file_attr/file_attr05.c | 1 +
>  1 file changed, 1 insertion(+)

> diff --git a/testcases/kernel/syscalls/file_attr/file_attr05.c b/testcases/kernel/syscalls/file_attr/file_attr05.c
> index 6c1471da33e7..85b6cafc5f17 100644
> --- a/testcases/kernel/syscalls/file_attr/file_attr05.c
> +++ b/testcases/kernel/syscalls/file_attr/file_attr05.c
> @@ -49,6 +49,7 @@ static struct tst_test test = {
>  	.skip_filesystems = (const char *const []) {
>  		"xfs",
>  		"fuse", /* EINVAL is raised before EOPNOTSUPP */
> +		"ntfs", /* mounted via ntfs-3g (FUSE), returns EINVAL */
For me it'd work to replace "fuse" with "ntfs" (i.e. remove "fuse").
Does it work for you as well, or you need to have blacklisted both?

>  		"vfat", /* vfat is not implementing file_[set|get]attr */
Also it looks to me that vfat is working.

Kind regards,
Petr
>  		NULL,
>  	},

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Re: [LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Matt Ochs via ltp]

Hi Petr,

> On Apr 9, 2026, at 02:53, Petr Vorel <pvorel@suse.cz> wrote:
> 
> Hi Matthew,
> 
>> LTP mounts ntfs via ntfs-3g (FUSE) rather than the kernel ntfs3
>> driver. ntfs-3g's ntfs_ioctl() returns EINVAL for any unhandled
>> ioctl, including FS_IOC_FSSETXATTR, so file_setattr() returns
>> EINVAL instead of the expected EOPNOTSUPP.
> 
>> Add "ntfs" to skip_filesystems for the same reason "fuse" is
>> already skipped.
> 
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
> Good catch, thanks!

I appreciate the review!

> 
> We did not notice, because we have ntfs3 blacklisted in openSUSE Tumbleweed:
> 
> cat /etc/modprobe.d/60-blacklist_fs-ntfs3.conf
> # The ntfs3 file system is blacklisted by default because it isn't actively
> # supported by SUSE.
> blacklist ntfs3
> # The filesystem can be un-blacklisted by running "modprobe ntfs3".
> # See README.md in the suse-module-tools package for details.
> install ntfs3 /usr/lib/module-init-tools/unblacklist ntfs3; /sbin/modprobe --ignore-install ntfs3
> 
> Therefore it works:
> # ./file_attr05
> ...
> tst_supported_fs_types.c:98: TINFO: Kernel supports ext2
> tst_supported_fs_types.c:63: TINFO: mkfs.ext2 does exist
> tst_supported_fs_types.c:98: TINFO: Kernel supports ext3
> tst_supported_fs_types.c:63: TINFO: mkfs.ext3 does exist
> tst_supported_fs_types.c:98: TINFO: Kernel supports ext4
> tst_supported_fs_types.c:63: TINFO: mkfs.ext4 does exist
> tst_supported_fs_types.c:157: TINFO: Skipping xfs as requested by the test
> tst_supported_fs_types.c:98: TINFO: Kernel supports btrfs
> tst_supported_fs_types.c:63: TINFO: mkfs.btrfs does exist
> tst_supported_fs_types.c:106: TINFO: Skipping bcachefs because of FUSE blacklist
> tst_supported_fs_types.c:157: TINFO: Skipping vfat as requested by the test
> tst_supported_fs_types.c:98: TINFO: Kernel supports exfat
> tst_supported_fs_types.c:63: TINFO: mkfs.exfat does exist
> tst_supported_fs_types.c:133: TINFO: FUSE does support ntfs
> tst_supported_fs_types.c:63: TINFO: mkfs.ntfs does exist
> tst_supported_fs_types.c:165: TINFO: Skipping FUSE based ntfs as requested by the test
> ...
> 
> But if I force ntfs, it really fails due using ntfs3:
> # LTP_FORCE_SINGLE_FS_TYPE=ntfs ./file_attr05
> ...
> tst_supported_fs_types.c:199: TINFO: WARNING: force testing only ntfs
> tst_test.c:1997: TINFO: === Testing on ntfs ===
> tst_test.c:1295: TINFO: Formatting /dev/loop0 with ntfs opts='' extra opts=''
> The partition start sector was not specified for /dev/loop0 and it could not be obtained automatically.  It has been set to 0.
> The number of sectors per track was not specified for /dev/loop0 and it could not be obtained automatically.  It has been set to 0.
> The number of heads was not specified for /dev/loop0 and it could not be obtained automatically.  It has been set to 0.
> To boot from a device, Windows needs the 'partition start sector', the 'sectors per track' and the 'number of heads' to be set.
> Windows will not be able to boot from this device.
> tst_test.c:1307: TINFO: Mounting /dev/loop0 to /tmp/LTP_filWegMd2/mntpoint fstyp=ntfs flags=0
> tst_test.c:1307: TINFO: Trying FUSE...
> file_attr05.c:23: TFAIL: file_setattr(AT_FDCWD, FILEPATH, attr_set, FILE_ATTR_SIZE_LATEST, 0) expected EOPNOTSUPP: EINVAL (22)
> 
> Other way is if I remove blacklist and manually run 'modprobe ntfs3'.
> 
>> Signed-off-by: Matthew R. Ochs <mochs@nvidia.com>
>> ---
>> testcases/kernel/syscalls/file_attr/file_attr05.c | 1 +
>> 1 file changed, 1 insertion(+)
> 
>> diff --git a/testcases/kernel/syscalls/file_attr/file_attr05.c b/testcases/kernel/syscalls/file_attr/file_attr05.c
>> index 6c1471da33e7..85b6cafc5f17 100644
>> --- a/testcases/kernel/syscalls/file_attr/file_attr05.c
>> +++ b/testcases/kernel/syscalls/file_attr/file_attr05.c
>> @@ -49,6 +49,7 @@ static struct tst_test test = {
>> .skip_filesystems = (const char *const []) {
>> "xfs",
>> "fuse", /* EINVAL is raised before EOPNOTSUPP */
>> + "ntfs", /* mounted via ntfs-3g (FUSE), returns EINVAL */
> For me it'd work to replace "fuse" with "ntfs" (i.e. remove "fuse").
> Does it work for you as well, or you need to have blacklisted both?

Regarding replacing "fuse" with "ntfs": on Ubuntu, ntfs3 is available
as a kernel module, so the detection reports "Kernel supports ntfs”
and the FUSE skip path never fires — meaning "fuse" alone doesn’t
catch it. Removing "fuse" would also drop coverage of other
FUSE-based filesystems, so I'd prefer to keep both entries.

-matt

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Re: [LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Petr Vorel]

Hi Matt
> Hi Petr,

> > On Apr 9, 2026, at 02:53, Petr Vorel <pvorel@suse.cz> wrote:

> > Hi Matthew,

> >> LTP mounts ntfs via ntfs-3g (FUSE) rather than the kernel ntfs3
> >> driver. ntfs-3g's ntfs_ioctl() returns EINVAL for any unhandled
> >> ioctl, including FS_IOC_FSSETXATTR, so file_setattr() returns
> >> EINVAL instead of the expected EOPNOTSUPP.

> >> Add "ntfs" to skip_filesystems for the same reason "fuse" is
> >> already skipped.

> > Reviewed-by: Petr Vorel <pvorel@suse.cz>
> > Good catch, thanks!

> I appreciate the review!

You're welcome, thanks for your contributions!

> > We did not notice, because we have ntfs3 blacklisted in openSUSE Tumbleweed:

...
> >> diff --git a/testcases/kernel/syscalls/file_attr/file_attr05.c b/testcases/kernel/syscalls/file_attr/file_attr05.c
> >> index 6c1471da33e7..85b6cafc5f17 100644
> >> --- a/testcases/kernel/syscalls/file_attr/file_attr05.c
> >> +++ b/testcases/kernel/syscalls/file_attr/file_attr05.c
> >> @@ -49,6 +49,7 @@ static struct tst_test test = {
> >> .skip_filesystems = (const char *const []) {
> >> "xfs",
> >> "fuse", /* EINVAL is raised before EOPNOTSUPP */
> >> + "ntfs", /* mounted via ntfs-3g (FUSE), returns EINVAL */
> > For me it'd work to replace "fuse" with "ntfs" (i.e. remove "fuse").
> > Does it work for you as well, or you need to have blacklisted both?

> Regarding replacing "fuse" with "ntfs": on Ubuntu, ntfs3 is available
> as a kernel module, so the detection reports "Kernel supports ntfs”
> and the FUSE skip path never fires — meaning "fuse" alone doesn’t
> catch it. Removing "fuse" would also drop coverage of other
> FUSE-based filesystems, so I'd prefer to keep both entries.

I actually think that other fuse implementations work, fuse was probably added
to fix ntfs. Or am I wrong? But that can be solved as a separate effort, I don't
want to block what you plan to fix.

Kind regards,
Petr

> -matt

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Re: [LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Cyril Hrubis]

Hi!
> LTP mounts ntfs via ntfs-3g (FUSE) rather than the kernel ntfs3
> driver. ntfs-3g's ntfs_ioctl() returns EINVAL for any unhandled
> ioctl, including FS_IOC_FSSETXATTR, so file_setattr() returns
> EINVAL instead of the expected EOPNOTSUPP.
> 
> Add "ntfs" to skip_filesystems for the same reason "fuse" is
> already skipped.

The "fuse" in skiplist should match all fuse based filesystems. We pass
the skip_filesystems pointer to tst_get_supported_fs_types() in
lib/tst_supported_fs_types.c. If "fuse" is present there we enable
skip_fuse flag nad pass it to fs_could_be_used() function. In the
fs_could_be_used() we check if filesystem is implemented by fuse and
then skip it accordingly.

When I run the test I see:

...
tst_supported_fs_types.c:165: TINFO: Skipping FUSE based ntfs as requested by the test
...

So likely something else is at play here. Are you sure you are dealing
with a fuse based ntfs or with the kernel based implementation?

-- 
Cyril Hrubis
chrubis@suse.cz

-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

Re: [LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Matt Ochs via ltp]

Hi Cyril, 

> On Apr 9, 2026, at 03:27, Cyril Hrubis <chrubis@suse.cz> wrote:
> 
> Hi!
>> LTP mounts ntfs via ntfs-3g (FUSE) rather than the kernel ntfs3
>> driver. ntfs-3g's ntfs_ioctl() returns EINVAL for any unhandled
>> ioctl, including FS_IOC_FSSETXATTR, so file_setattr() returns
>> EINVAL instead of the expected EOPNOTSUPP.
>> 
>> Add "ntfs" to skip_filesystems for the same reason "fuse" is
>> already skipped.
> 
> The "fuse" in skiplist should match all fuse based filesystems. We pass
> the skip_filesystems pointer to tst_get_supported_fs_types() in
> lib/tst_supported_fs_types.c. If "fuse" is present there we enable
> skip_fuse flag nad pass it to fs_could_be_used() function. In the
> fs_could_be_used() we check if filesystem is implemented by fuse and
> then skip it accordingly.
> 
> When I run the test I see:
> 
> ...
> tst_supported_fs_types.c:165: TINFO: Skipping FUSE based ntfs as requested by the test
> ...
> 
> So likely something else is at play here. Are you sure you are dealing
> with a fuse based ntfs or with the kernel based implementation?
> 

On Ubuntu, ntfs3 is available as a kernel module, so                                                                                                                                                                                                                                             
has_kernel_support() in tst_supported_fs_types.c probes the kernel
mount, succeeds, and returns TST_FS_KERNEL immediately — never                                                                                                                                                                                                                                   
reaching the FUSE detection path. As a result, the existing "fuse"
skip doesn't fire even though safe_macros always mounts ntfs via
FUSE anyway.                                                                                                                                                                                                                                                                                     
   
I investigated fixing this in the library by consulting possibly_fuse()                                                                                                                                                                                                                          
in has_kernel_support() to fall through to FUSE detection when
safe_macros would use FUSE regardless. However, possibly_fuse() covers
both "ntfs" and "exfat", but safe_macros treats them differently —                                                                                                                                                                                                                               
ntfs always uses FUSE, while exfat tries the kernel driver first and
falls back to FUSE only on failure. The fix would incorrectly mark                                                                                                                                                                                                                               
exfat as FUSE-based on systems with kernel exfat support, causing                                                                                                                                                                                                                                
spurious skips in tests that skip "fuse".
                                                                                                                                                                                                                                                                                                   
Given that, I think the test-level fix is appropriate here. ntfs-3g                                                                                                                                                                                                                              
returns EINVAL for any unhandled ioctl, so skipping ntfs in file_attr05
is correct and consistent with how "fuse" is already handled in the                                                                                                                                                                                                                              
same skip list.


-matt

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Re: [LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Cyril Hrubis]

Hi!
> > When I run the test I see:
> >
> > ...
> > tst_supported_fs_types.c:165: TINFO: Skipping FUSE based ntfs as requested by the test
> > ...
> >
> > So likely something else is at play here. Are you sure you are dealing
> > with a fuse based ntfs or with the kernel based implementation?
> >
>
> On Ubuntu, ntfs3 is available as a kernel module, so
> has_kernel_support() in tst_supported_fs_types.c probes the kernel
> mount, succeeds, and returns TST_FS_KERNEL immediately — never
> reaching the FUSE detection path. As a result, the existing "fuse"
> skip doesn't fire even though safe_macros always mounts ntfs via FUSE
> anyway.

I think I've figured it out. The ntfs driver in kernel is the old
read-only one and ntfs3 is the new read-write kernel driver.

What we can do in the library is to fix the ntfs driver to be always
handled by fuse and add ntfs3 that is the read-write kernel driver. With
that we will fix this test but also enable more coverage.

This works for me:

diff --git a/lib/tst_mkfs.c b/lib/tst_mkfs.c
index c619a373d..961ffc091 100644
--- a/lib/tst_mkfs.c
+++ b/lib/tst_mkfs.c
@@ -50,6 +50,9 @@ void tst_mkfs_(const char *file, const int lineno, void (cleanup_fn)(void),
                return;
        }

+       if (!strcmp(fs_type, "ntfs3"))
+               fs_type = "ntfs";
+
        snprintf(mkfs, sizeof(mkfs), "mkfs.%s", fs_type);

        if (fs_opts) {
diff --git a/lib/tst_supported_fs_types.c b/lib/tst_supported_fs_types.c
index 0c8c8dc50..d3020fc48 100644
--- a/lib/tst_supported_fs_types.c
+++ b/lib/tst_supported_fs_types.c
@@ -30,6 +30,7 @@ static const char *const fs_type_whitelist[] = {
        "vfat",
        "exfat",
        "ntfs",
+       "ntfs3",
        "tmpfs",
        NULL
 };
@@ -51,6 +52,9 @@ static int has_mkfs(const char *fs_type)
                return 1;
        }

+       if (!strcmp(fs_type, "ntfs3"))
+               fs_type = "ntfs";
+
        sprintf(buf, "mkfs.%s >/dev/null 2>&1", fs_type);

        ret = tst_system(buf);
@@ -87,6 +91,9 @@ static enum tst_fs_impl has_kernel_support(const char *fs_type)
        char template[PATH_MAX];
        int ret;

+       if (!strcmp(fs_type, "ntfs"))
+               goto check_fuse;
+
        snprintf(template, sizeof(template), "%s/mountXXXXXX", tmpdir);
        if (!mkdtemp(template))
                tst_brk(TBROK | TERRNO, "mkdtemp(%s) failed", template);
@@ -102,6 +109,7 @@ static enum tst_fs_impl has_kernel_support(const char *fs_type)

        SAFE_RMDIR(template);

+check_fuse:
        if (tst_fs_in_skiplist(fs_type, fs_type_fuse_blacklist)) {
                tst_res(TINFO, "Skipping %s because of FUSE blacklist", fs_type);
                return TST_FS_UNSUPPORTED;


-- 
Cyril Hrubis
chrubis@suse.cz

-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

Re: [LTP] [PATCH] syscalls: file_attr05: skip ntfs filesystem

[Matt Ochs via ltp]

> On Apr 10, 2026, at 05:04, Cyril Hrubis <chrubis@suse.cz> wrote:
> 
> Hi!
>>> When I run the test I see:
>>> 
>>> ...
>>> tst_supported_fs_types.c:165: TINFO: Skipping FUSE based ntfs as requested by the test
>>> ...
>>> 
>>> So likely something else is at play here. Are you sure you are dealing
>>> with a fuse based ntfs or with the kernel based implementation?
>>> 
>> 
>> On Ubuntu, ntfs3 is available as a kernel module, so
>> has_kernel_support() in tst_supported_fs_types.c probes the kernel
>> mount, succeeds, and returns TST_FS_KERNEL immediately — never
>> reaching the FUSE detection path. As a result, the existing "fuse"
>> skip doesn't fire even though safe_macros always mounts ntfs via FUSE
>> anyway.
> 
> I think I've figured it out. The ntfs driver in kernel is the old
> read-only one and ntfs3 is the new read-write kernel driver.
> 
> What we can do in the library is to fix the ntfs driver to be always
> handled by fuse and add ntfs3 that is the read-write kernel driver. With
> that we will fix this test but also enable more coverage.
> 
> This works for me:
> 
> diff --git a/lib/tst_mkfs.c b/lib/tst_mkfs.c
> index c619a373d..961ffc091 100644
> --- a/lib/tst_mkfs.c
> +++ b/lib/tst_mkfs.c
> @@ -50,6 +50,9 @@ void tst_mkfs_(const char *file, const int lineno, void (cleanup_fn)(void),
>                return;
>        }
> 
> +       if (!strcmp(fs_type, "ntfs3"))
> +               fs_type = "ntfs";
> +
>        snprintf(mkfs, sizeof(mkfs), "mkfs.%s", fs_type);
> 
>        if (fs_opts) {
> diff --git a/lib/tst_supported_fs_types.c b/lib/tst_supported_fs_types.c
> index 0c8c8dc50..d3020fc48 100644
> --- a/lib/tst_supported_fs_types.c
> +++ b/lib/tst_supported_fs_types.c
> @@ -30,6 +30,7 @@ static const char *const fs_type_whitelist[] = {
>        "vfat",
>        "exfat",
>        "ntfs",
> +       "ntfs3",
>        "tmpfs",
>        NULL
> };
> @@ -51,6 +52,9 @@ static int has_mkfs(const char *fs_type)
>                return 1;
>        }
> 
> +       if (!strcmp(fs_type, "ntfs3"))
> +               fs_type = "ntfs";
> +
>        sprintf(buf, "mkfs.%s >/dev/null 2>&1", fs_type);
> 
>        ret = tst_system(buf);
> @@ -87,6 +91,9 @@ static enum tst_fs_impl has_kernel_support(const char *fs_type)
>        char template[PATH_MAX];
>        int ret;
> 
> +       if (!strcmp(fs_type, "ntfs"))
> +               goto check_fuse;
> +
>        snprintf(template, sizeof(template), "%s/mountXXXXXX", tmpdir);
>        if (!mkdtemp(template))
>                tst_brk(TBROK | TERRNO, "mkdtemp(%s) failed", template);
> @@ -102,6 +109,7 @@ static enum tst_fs_impl has_kernel_support(const char *fs_type)
> 
>        SAFE_RMDIR(template);
> 
> +check_fuse:
>        if (tst_fs_in_skiplist(fs_type, fs_type_fuse_blacklist)) {
>                tst_res(TINFO, "Skipping %s because of FUSE blacklist", fs_type);
>                return TST_FS_UNSUPPORTED;
> 

Hi Cyril,

Tested your proposed changes, all scenarios pass:

1. Normal run with ntfs3 loaded — ntfs correctly detected as FUSE-based
   and skipped, ntfs3 runs via kernel driver and passes (6/6):

   tst_supported_fs_types.c: TINFO: FUSE does support ntfs
   tst_supported_fs_types.c: TINFO: Skipping FUSE based ntfs as requested by the test
   tst_supported_fs_types.c: TINFO: Kernel supports ntfs3
   tst_supported_fs_types.c: TINFO: mkfs.ntfs does exist
   ...
   tst_test.c: TINFO: === Testing on ntfs3 ===
   file_attr05.c: TPASS: file_setattr(...) : EOPNOTSUPP (95)

2. Normal run with ntfs3 not loaded — same result, kernel autoloads
   ntfs3 on mount (6/6).

3. Force ntfs3 — formats with mkfs.ntfs, mounts as ntfs3, passes.

4. Force ntfs — mounts via FUSE, returns EINVAL as expected, confirming
   the "fuse" skip is what protects the normal run.

Are you planning to send this as a formal patch? Happy to defer to
you since it's a cleaner fix at the library level, but want to make
sure it doesn't fall through the cracks.

-matt


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