#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2026 Oracle.  All Rights Reserved.
#
# FS QA Test No. 667
#
# Ensure that autonomous self healing fixes the filesystem correctly even if
# the original mount has moved somewhere else via --move.
#
. ./common/preamble
_begin_fstest auto selfhealing mount

. ./common/filter
. ./common/fuzzy
. ./common/systemd

if [ -n "$IN_MOUNTNS" ]; then
	_mount --make-rprivate /
	findmnt -o TARGET,PROPAGATION >> $seqres.full

	_scratch_mount
	_scratch_invoke_xfs_healer "$tmp.healer" --repair

	# Move the scratch filesystem to a completely different mountpoint so that
	# we can test if the healer can find it again.
	new_dir=$TEST_DIR/moocow
	mkdir -p $new_dir
	_mount --move $SCRATCH_MNT $new_dir

	df -t xfs >> $seqres.full

	# Access the broken directory to trigger a repair, then poll the directory
	# for 5 seconds to see if it gets fixed without us needing to intervene.
	ls $new_dir/some/victimdir > /dev/null 2> $tmp.err
	_filter_scratch < $tmp.err | _filter_test_dir
	try=0
	while [ $try -lt 50 ] && grep -q 'Structure needs cleaning' $tmp.err; do
		echo "try $try saw corruption" >> $seqres.full
		sleep 0.1
		ls $new_dir/some/victimdir > /dev/null 2> $tmp.err
		try=$((try + 1))
	done
	echo "try $try no longer saw corruption or gave up" >> $seqres.full
	_filter_scratch < $tmp.err | _filter_test_dir

	# List the dirents of /victimdir to see if it stops reporting corruption
	ls $new_dir/some/victimdir > /dev/null 2> $tmp.err
	try=0
	while [ $try -lt 50 ] && grep -q 'Structure needs cleaning' $tmp.err; do
		echo "retry $try still saw corruption" >> $seqres.full
		sleep 0.1
		ls $SCRATCH_MNT/some/victimdir > /dev/null 2> $tmp.err
		try=$((try + 1))
	done
	echo "retry $try no longer saw corruption or gave up" >> $seqres.full

	new_dir_unmount() {
		_unmount $new_dir
	}

	# Unmount to kill the healer
	_scratch_kill_xfs_healer new_dir_unmount
	cat $tmp.healer >> $seqres.full

	# No need to clean up, the mount ns destructor will detach the
	# filesystems for us.
	exit
fi

_cleanup()
{
	command -v _kill_fsstress &>/dev/null && _kill_fsstress
	cd /
	rm -r -f $tmp.*
	if [ -n "$new_dir" ]; then
		_unmount "$new_dir" &>/dev/null
		rm -rf "$new_dir"
	fi
}

_require_unshare
_require_test
_require_scrub
_require_xfs_io_command "repair"	# online repair support
_require_xfs_db_command "blocktrash"
_require_command "$XFS_HEALER_PROG" "xfs_healer"
_require_command "$XFS_PROPERTY_PROG" "xfs_property"
_require_scratch

_scratch_mkfs >> $seqres.full
_scratch_mount

_xfs_has_feature $SCRATCH_MNT rmapbt || \
	_notrun "reverse mapping required to test directory auto-repair"
_xfs_has_feature $SCRATCH_MNT parent || \
	_notrun "parent pointers required to test directory auto-repair"
_require_xfs_healer $SCRATCH_MNT --repair

# Configure the filesystem for automatic repair of the filesystem.
$XFS_PROPERTY_PROG $SCRATCH_MNT set autofsck=repair >> $seqres.full

# Create a largeish directory
dblksz=$(_xfs_get_dir_blocksize "$SCRATCH_MNT")
echo testdata > $SCRATCH_MNT/a
mkdir -p "$SCRATCH_MNT/some/victimdir"
for ((i = 0; i < (dblksz / 255); i++)); do
	fname="$(printf "%0255d" "$i")"
	ln $SCRATCH_MNT/a $SCRATCH_MNT/some/victimdir/$fname
done

# Did we get at least two dir blocks?
dirsize=$(stat -c '%s' $SCRATCH_MNT/some/victimdir)
test "$dirsize" -gt "$dblksz" || echo "failed to create two-block directory"

# Break the directory, remount filesystem
_scratch_unmount
_scratch_xfs_db -x \
	-c 'path /some/victimdir' \
	-c 'bmap' \
	-c 'dblock 1' \
	-c 'blocktrash -z -0 -o 0 -x 2048 -y 2048 -n 2048' >> $seqres.full

# mount --move only works if mount propagation is disabled, so we have to start
# a subshell with a separate mount namespace, disable propagation for the
# entire directory tree, and only then can we run our tests.
IN_MOUNTNS=1 unshare -m bash "$0"

_exit 0
