Re: [PATCH v2 09/13] generic/1230: Add sudden shutdown tests for multi block atomic writes

John Garry
2025-06-27T16:11:29Z

On 26/06/2025 12:59, Ojaswin Mujoo wrote:
> This test is intended to ensure that multi blocks atomic writes
> maintain atomic guarantees across sudden FS shutdowns.
>
> The way we work is that we lay out a file with random mix of written,
> unwritten and hole extents. Then we start performing atomic writes
> sequentially on the file while we parallely shutdown the FS. Then we
> note the last offset where the atomic write happened just before shut
> down and then make sure blocks around it either have completely old
> data or completely new data, ie the write was not torn during shutdown.
>
> We repeat the same with completely written, completely unwritten and completely
> empty file to ensure these cases are not torn either. Finally, we have a
> similar test for append atomic writes
>
> Suggested-by: Ritesh Harjani (IBM)<ritesh.list@gmail.com>
> Signed-off-by: Ojaswin Mujoo<ojaswin@linux.ibm.com>

this seems to work ok for xfs, as I get data verify errors when I remove
the -A arg to xfs_io when doing the atomic writes.

But I see this (always):

@@ -1,2 +1,83 @@
QA output created by 1230
+/home/opc/xfstests-dev/tests/generic/1230: line 13:
_require_scratch_write_atomic_multi_fsblock: command not found
+/home/opc/xfstests-dev/tests/generic/1230: line 149: kill: (535173) -
No such process
+/home/opc/xfstests-dev/tests/generic/1230: line 149: kill: (535256) -
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Silence is golden
[root@jgarry-ol9new xfstests-dev]#

any idea (apart from _require_scratch_write_atomic_multi_fsblock)?