Re: [PATCH] loop: remove support for swapping loop fds

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

On Oct 13, 2026 / 16:03, shinichiro.kawasaki@wdc.com wrote:
> Dear patch submitter,
> 
> Blktests CI has tested the following submission:
> Status:     FAILURE
> Name:       loop: remove support for swapping loop fds

This kernel patch removed the support of ioctl LOOP_CHANGE_FD.

> Patchwork:  https://patchwork.kernel.org/series/1183887/&state=*
> Run record: https://github.com/linux-blktests/linux-block/actions/runs/38278109458
> 
> 
> Failed test cases: loop/006

And this test case confirms that the ioctl LOOP_CHANGE_FD works well. After
removing the ioctl, the test case failure is expected. Blktests CI caught it,
and reported it with this e-mail.

The test case loop/006 is no longer valid, and its failure should be handled.
I can think of two action candidates:

  1) just remove the test case loop/006
  2) skip the test case for kernel versions larger than v7.4, and keep it for
     older kernel versions

The ioctl has been broken for certain period, so I think action 1) is more
appropriate. If anyone has different opinion, please share. Otherwise, I will
post a patch to remove loop/006.