[LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[Vasileios Almpanis via ltp]

df01.sh derives DF_FS_TYPE by matching the test mount in /proc/mounts
against either the real FS type or "fuseblk", the type used when
ntfs-3g/FUSE mounts a block device via the privileged blkdev path.

However, when the filesystem is mounted from inside a user namespace or
an unprivileged/virtualized container, that path is unavailable: the
kernel's fuseblk file_system_type lacks FS_USERNS_MOUNT and requires
FS_REQUIRES_DEV, so libfuse/ntfs-3g falls back to a plain anonymous
mount and the kernel reports the type as "fuse" instead of "fuseblk":

  /dev/loop0 /mnt fuse rw,relatime,user_id=0,group_id=0,allow_other

In that case the grep matches nothing and DF_FS_TYPE becomes empty,
which breaks two subtests:

  test5:  "df -t $DF_FS_TYPE -P" collapses to "df -t -P"; -t consumes
          -P as its type argument -> "df: no file systems processed",
          non-zero exit -> TFAIL.
  test12: "df -x $DF_FS_TYPE -P" collapses to "df -x -P"; the device is
          no longer excluded and appears in the output -> TFAIL.

Add "fuse" so the containerized/userns FUSE mount is detected too.

Signed-off-by: Vasileios Almpanis <vasileios.almpanis@virtuozzo.com>
---
 testcases/commands/df/df01.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/commands/df/df01.sh b/testcases/commands/df/df01.sh
index 5af4f68e6..72b02ce34 100755
--- a/testcases/commands/df/df01.sh
+++ b/testcases/commands/df/df01.sh
@@ -15,7 +15,7 @@ TST_NEEDS_ROOT=1
 
 setup()
 {
-	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk)" /proc/mounts | awk 'NR==1{print $3}')"
+	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk|fuse)" /proc/mounts | awk 'NR==1{print $3}')"
 }
 
 df_test()
-- 
2.47.3


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Re: [LTP] df01: detect "fuse" fstype in addition to "fuseblk"

[linuxtestproject.agent]

Hi Vasileios,

On Wed, 01 Jul 2026 11:00:28 +0000, Vasileios Almpanis wrote:
> df01: detect "fuse" fstype in addition to "fuseblk"

Verdict - Reviewed

---
Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

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Re: [LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[Avinesh Kumar via ltp]

Hi,

Reviewed-by: Avinesh Kumar <avinesh.kumar@suse.com>

Regards,
Avinesh

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Re: [LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[Andrea Cervesato via ltp]

Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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Re: [LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[Andrea Cervesato via ltp]

Merged, Thanks!

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Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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Re: [LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[Cyril Hrubis]

Hi!
>  setup()
>  {
> -	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk)" /proc/mounts | awk 'NR==1{print $3}')"
> +	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk|fuse)" /proc/mounts | awk 'NR==1{print $3}')"

fuse is a substring of fuseblk so just ($TST_FS_TYPE|fuse) should
suffice, right?

>  }
>  
>  df_test()
> -- 
> 2.47.3
> 

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[Vasileios Almpanis via ltp]

On 7/7/26 12:29 PM, Cyril Hrubis wrote:
> Hi!
>>   setup()
>>   {
>> -	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk)" /proc/mounts | awk 'NR==1{print $3}')"
>> +	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk|fuse)" /proc/mounts | awk 'NR==1{print $3}')"
> fuse is a substring of fuseblk so just ($TST_FS_TYPE|fuse) should
> suffice, right?

Hi Chris, looking at it again, yes you are right just fuse would catch 
both cases. I see the patch is already in master
do you want me to send another one or shall we leave it as it is?

>
>>   }
>>   
>>   df_test()
>> -- 
>> 2.47.3
>>
-- 
Best regards, Vasileios Almpanis
Software Developer, Virtuozzo.


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Re: [LTP] [PATCH] df01: detect "fuse" fstype in addition to "fuseblk"

[Cyril Hrubis]

Hi!
> >>   setup()
> >>   {
> >> -	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk)" /proc/mounts | awk 'NR==1{print $3}')"
> >> +	DF_FS_TYPE="$(grep -E "$TST_MNTPOINT ($TST_FS_TYPE|fuseblk|fuse)" /proc/mounts | awk 'NR==1{print $3}')"
> > fuse is a substring of fuseblk so just ($TST_FS_TYPE|fuse) should
> > suffice, right?
> 
> Hi Chris, looking at it again, yes you are right just fuse would catch 
> both cases. I see the patch is already in master
> do you want me to send another one or shall we leave it as it is?

Just send a patch againts latest git head that removes the fuseblk.

-- 
Cyril Hrubis
chrubis@suse.cz

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