Re: [PATCH v2] xfs: test xfsdump subtree restores

[Zorro Lang <zlang@kernel.org>]

On Thu, Jul 23, 2026 at 04:26:17PM +1000, 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>
> ---
> Changes since v1
> - Fix use of _do, including label quoting
> - Update test output
> - Add tests for additional edge cases
> ---
>  tests/xfs/995     | 58 +++++++++++++++++++++++++++++++++++++++++++++++
>  tests/xfs/995.out |  8 +++++++
>  2 files changed, 66 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 000000000..bba0bcd52
> --- /dev/null
> +++ b/tests/xfs/995
> @@ -0,0 +1,58 @@
> +#! /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
> +_do_die_on_error="always"

I think this line is useless now, right? I'll remove it.

> +
> +_fixed_by_git_commit xfsdump dd63de5 \
> +	"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 $SCRATCH_MNT/restore_me/B/C/D/E/F/G
> +
> +_do "Creating l0 dump" "$XFSDUMP_PROG -L lab_l0 -M test -l0 -f $tmp.dump.l0 $SCRATCH_MNT"
> +
> +mv $SCRATCH_MNT/a/b/c $SCRATCH_MNT/1
> +
> +_do "Creating l2 dump" "$XFSDUMP_PROG -L lab_l2.0 -M test -l2 -f $tmp.dump.l2.0 $SCRATCH_MNT"
> +
> +dir=$(mktemp -d $SCRATCH_MNT/restore_XXX)
> +_do "Cumulative restore l0" "$XFSRESTORE_PROG -f $tmp.dump.l0 -r $dir"
> +_do "Cumulative restore l2" "$XFSRESTORE_PROG -f $tmp.dump.l2.0 -r $dir"
> +
> +dir=$(mktemp -d $SCRATCH_MNT/restore_XXX)
> +_do "Cumulative subtree restore l0" "$XFSRESTORE_PROG -f $tmp.dump.l0 -r -s restore_me $dir"
> +# The next command core dumps prior to xfsdump v3.3.0 when noref_elim_recurse attempts to
> +# rename directories outside of the subtree when their parent has not been created.
> +_do "Cumulative subtree restore l2" "$XFSRESTORE_PROG -f $tmp.dump.l2.0 -r $dir"
> +
> +dir=$(mktemp -d $SCRATCH_MNT/restore_XXX)
> +_do "Restore l2 on its own" "$XFSRESTORE_PROG -f $tmp.dump.l0 -r -s restore_me $dir"
> +
> +# success, all done
> +_exit 0
> diff --git a/tests/xfs/995.out b/tests/xfs/995.out
> new file mode 100644
> index 000000000..9a620eb31
> --- /dev/null
> +++ b/tests/xfs/995.out
> @@ -0,0 +1,8 @@
> +QA output created by 995
> +Creating l0 dump... done
> +Creating l2 dump... done
> +Cumulative restore l0... done
> +Cumulative restore l2... done
> +Cumulative subtree restore l0... done
> +Cumulative subtree restore l2... done
> +Restore l2 on its own... done
> -- 
> 2.52.0
> 
>