Re: [PATCH] fstests: btrfs: test if btrfs control file rejects unknown ioctls

[Dhruva G <goledhruva@gmail.com>]

On 12-10-2026 04:37, Qu Wenruo wrote:
> This is a regression test for a recent bug fix, where unsupported ioctls
> are not properly rejected for btrfs control file (normally at
> "/dev/btrfs-control").
> 
> The test case itself is super simple, which doesn't even require test or
> scratch device, it just run the "btrfs_ioctl" program using
> "get_subvol_info" ioctl on "/dev/btrfs-control", which should fail as
> that ioctl only makes sense on a mounted btrfs, not the btrfs control
> file.
> 
> The error will be outputted to the golden output so that we can catch
> any unexpected success.
> 
> Signed-off-by: Qu Wenruo <wqu@suse.com>
> ---
>  tests/btrfs/359     | 26 ++++++++++++++++++++++++++

fails before the fix, passes after it on a local x86_64 Btrfs VM.

Tested-by: Dhruva Gole <goledhruva@gmail.com>
Reviewed-by: Dhruva Gole <goledhruva@gmail.com>

Regards,
Dhruva Gole