Re: [PATCH v3] fstests: test premature ENOSPC in zoned garbage collection

On 4/15/26 7:56 AM, Christoph Hellwig wrote:
> On Wed, Apr 15, 2026 at 07:53:52AM +0200, Johannes Thumshirn wrote:
>> On 4/15/26 7:22 AM, Christoph Hellwig wrote:
>>> On Tue, Apr 14, 2026 at 04:33:41PM +0200, Johannes Thumshirn wrote:
>>>> This test stresses garbage collection in zoned file systems by
>>>> constantly overwriting the same file. It is inspired by a reproducer for
>>>> a btrfs bugifx.
>>> s/bugifx/bugfix/
>> Fixed
>>> I tried this on XFS, and it doesn't work as XFS uses SCRATCH_RTDEV for
>>> zoned data.  Manually hacking in SCRATCH_RTDEV makes it work, but that
>>> will break btrfs.  Maybe you can add a little:
>>>
>>> if [ -b "$SCRATCH_RTDEV" ];
>>> 	zoned_dev=$SCRATCH_RTDEV
>>> else
>>> 	zoned_dev=$SCRATCH_DEV
>>> endif
>>>
>>> end then use $zoned_dev to make it portable?
>> Sure, can I still use _scratch_mkfs_sized for XFS?
> Yes. It sizes both the main and RT device.

The test still doesn't run for me on XFS:

[  160.045250] XFS (vda): EXPERIMENTAL zoned RT device feature enabled.  
Use at your own risk!
[  160.045707] XFS (vda): Mounting V5 Filesystem 
47eb9ed8-526f-4dc3-a488-5862f403ee5c
[  160.062623] XFS (vda): Ending clean mount
[  160.062734] XFS (vda): limiting open zones to 15 due to total zone 
count (60)
[  160.062797] XFS (vda): 60 zones of 65536 blocks (15 max open zones)
FSTYP         -- xfs (non-debug)
PLATFORM      -- Linux/x86_64 virtme-ng 7.0.0-rc5+ #407 SMP 
PREEMPT_DYNAMIC Mon Mar 30 14:36:40 CEST 2026
MKFS_OPTIONS  -- -f /dev/vdb
MOUNT_OPTIONS -- /dev/vdb /tmp/scratch

[  160.375268] XFS (vdb): EXPERIMENTAL zoned RT device feature enabled.  
Use at your own risk!
[  160.375819] XFS (vdb): Mounting V5 Filesystem 
24c36996-2bdd-43cc-a1d0-6fb05f87cf51
[  160.390418] XFS (vdb): Ending clean mount
[  160.390532] XFS (vdb): limiting open zones to 15 due to total zone 
count (60)
[  160.390597] XFS (vdb): 60 zones of 65536 blocks (15 max open zones)
[  160.435057] XFS (vdb): Unmounting Filesystem 
24c36996-2bdd-43cc-a1d0-6fb05f87cf51
[  161.600694] XFS (vda): Unmounting Filesystem 
47eb9ed8-526f-4dc3-a488-5862f403ee5c
[  161.877731] XFS (vda): EXPERIMENTAL zoned RT device feature enabled.  
Use at your own risk!
[  161.878359] XFS (vda): Mounting V5 Filesystem 
47eb9ed8-526f-4dc3-a488-5862f403ee5c
[  161.896765] XFS (vda): Ending clean mount
[  161.896909] XFS (vda): limiting open zones to 15 due to total zone 
count (60)
[  161.897017] XFS (vda): 60 zones of 65536 blocks (15 max open zones)
generic/999        [  161.929562] run fstests generic/999 at 2026-04-15 
08:09:50
[not run] _scratch_mkfs_sized failed with (17179869184)
Ran: generic/999
Not run: generic/999
Passed all 1 tests

[  162.477746] XFS (vda): Unmounting Filesystem 
47eb9ed8-526f-4dc3-a488-5862f403ee5c