Adapt loop tests for upcomming 6.11

[pevik]

Gulam Mohamed reported [1] a problem with 18048c1af783 ("loop: Fix a race between loop detach and loop open") [2] which will be in upcomming 6.11. Various tests fail due the device is closed at the end of the test and the test cases are expecting for the results which can occur after the device is detached.

Gulam reported these tests are failing:

• ioctl04, ioctl05, ioctl06, ioctl07, ioctl09
• ioctl_loop01, ioctl_loop02, ioctl_loop03, ioctl_loop04, ioctl_loop05, ioctl_loop06, ioctl_loop07

I did some testing via rapido-linux and only these fail (ioctl_loop05 not tested):

$ uname -r
6.10.0-rc3-00128-g18048c1af783

# ./ioctl_loop02 # also ioctl_loop07
...
ioctl_loop02.c:54: TINFO: Using LOOP_CONFIGURE with read_only flag
ioctl_loop02.c:61: TBROK: ioctl(5,(0x4C0A),...) failed: EBUSY (16)

# ./ioctl_loop06
...
ioctl_loop06.c:74: TINFO: Using LOOP_CONFIGURE with block_size < 512
ioctl_loop06.c:67: TFAIL: Set block size failed expected EINVAL got: EBUSY (16)
ioctl_loop06.c:74: TINFO: Using LOOP_CONFIGURE with block_size > PAGE_SIZE
ioctl_loop06.c:67: TFAIL: Set block size failed expected EINVAL got: EBUSY (16)
ioctl_loop06.c:74: TINFO: Using LOOP_CONFIGURE with block_size != power_of_2
ioctl_loop06.c:67: TFAIL: Set block size failed expected EINVAL got: EBUSY (16)

[1] https://lore.kernel.org/ltp/IA1PR10MB724059C5A7A69CE2A4AF257698DF2@IA1PR10MB7240.namprd10.prod.outlook.com/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=18048c1af7836b8e31739d9eaefebc2bf76261f7
[3] https://lore.kernel.org/ltp/20240711135507.GA84439@pevik/

[pevik]

Patch sent:
https://patchwork.ozlabs.org/project/ltp/patch/99d43982e2469b1423701b6772677173b5a53429.1723703723.git.jstancek@redhat.com/
https://lore.kernel.org/ltp/99d43982e2469b1423701b6772677173b5a53429.1723703723.git.jstancek@redhat.com/