Re: [PATCH] xfs: test xfsdump subtree restores

[Zorro Lang <zlang@kernel.org>]

On Thu, Mar 26, 2026 at 02:00:12PM +1100, Donald Douwsma wrote:
> Regression test for cumulative restores where a directory has been
> renamed outside of the subtree being restored triggering the assert:
> 
>   xfsrestore: tree.c:1421: noref_elim_recurse: Assertion 'isrealpr' failed
> 
> Signed-off-by: Donald Douwsma <ddouwsma@redhat.com>
> ---
>  tests/xfs/995     | 51 +++++++++++++++++++++++++++++++++++++++++++++++
>  tests/xfs/995.out |  2 ++
>  2 files changed, 53 insertions(+)
>  create mode 100755 tests/xfs/995
>  create mode 100644 tests/xfs/995.out
> 
> diff --git a/tests/xfs/995 b/tests/xfs/995
> new file mode 100755
> index 00000000..54172572
> --- /dev/null
> +++ b/tests/xfs/995
> @@ -0,0 +1,51 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2026 Red Hat.  All Rights Reserved.
> +#
> +# FS QA Test 995
> +#
> +# Regression test for cumulative restores where a directory has been
> +# renamed outside of the subtree being restored resulting in
> +#
> +#   xfsrestore: tree.c:1421: noref_elim_recurse: Assertion 'isrealpr' failed
> +#
> +. ./common/preamble
> +_begin_fstest auto dump
> +
> +_fixed_by_git_commit xfsdump XXXXXXX \
> +	"xfsrestore: only process subtrees that are selected"
> +
> +# Override the default cleanup function.
> +_cleanup()
> +{
> +	_cleanup_dump
> +	cd /
> +	rm -r -f $tmp.*
> +}
> +
> +# Import common functions.
> +. ./common/dump
> +
> +# Modify as appropriate.
> +_require_scratch
> +_scratch_mkfs_xfs >>$seqres.full
> +_scratch_mount
> +
> +mkdir -p $SCRATCH_MNT/a/b/c/d/e/f/g
> +mkdir -p $SCRATCH_MNT/restore_me/B/C/D/E/F/G
> +
> +_do "$XFSDUMP_PROG -L "lab_l0" -M "test" -l0 -f $tmp.dump.l0 $SCRATCH_MNT"
> +
> +mv $SCRATCH_MNT/a/b/c $SCRATCH_MNT/1
> +
> +_do "$XFSDUMP_PROG -L "lab_l2" -M "test" -l2 -f $tmp.dump.l2 $SCRATCH_MNT"
> +
> +dir=$(mktemp -d $SCRATCH_MNT/restore_XXX)
> +_do "$XFSRESTORE_PROG -f $tmp.dump.l0 -r -s restore_me $dir"
> +_do "$XFSRESTORE_PROG -f $tmp.dump.l2 -r $dir"

Hi Donald,

I almost forgot we had this _do helper :)

I think your test target is the 2nd xfsrestore command line (about incremental
changes), a comment might be good.

I saw used four _do calls here. I just checked the logic of the _do helper, I
suspect your current usage might prevent the test from catching command failures,
allowing it to 'successfully' continue...

A simple fix would be adding a "note" as a first argument to each _do helper call,
e.g:
  _do "Full dump" "$XFSDUMP_PROG ..."
Once all four calls are updated this way, we can remove the "test $? -ne 0 && exit"
lines too, and rely on golden image matching to detect any failures. What do you
think?

Thanks,
Zorro

> +
> +test $? -ne 0 && exit
> +
> +echo Silence is golden
> +# success, all done
> +_exit 0
> diff --git a/tests/xfs/995.out b/tests/xfs/995.out
> new file mode 100644
> index 00000000..776fa6f2
> --- /dev/null
> +++ b/tests/xfs/995.out
> @@ -0,0 +1,2 @@
> +QA output created by 995
> +Silence is golden
> -- 
> 2.47.3
> 
>