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#!/bin/bash
source $TOP/tests/common
check_prereq btrfs-debug-tree
check_prereq mkfs.btrfs
setup_root_helper
prepare_test_dev 1G
if [ -z $TEST_MNT ];then
echo " [NOTRUN] extent tree rebuild, need TEST_MNT variant"
exit 0
fi
# test whether fsck can rebuild a corrupted extent tree
test_extent_tree_rebuild()
{
run_check $SUDO_HELPER $TOP/mkfs.btrfs -f $TEST_DEV
run_check $SUDO_HELPER mount $TEST_DEV $TEST_MNT
run_check $SUDO_HELPER cp -aR /lib/modules/`uname -r`/ $TEST_MNT
for i in `seq 1 100`;do
run_check $SUDO_HELPER $TOP/btrfs sub snapshot $TEST_MNT \
$TEST_MNT/snapaaaaaaa_$i
done
run_check $SUDO_HELPER umount $TEST_DEV
# get extent root bytenr
extent_root_bytenr=`$SUDO_HELPER $TOP/btrfs-debug-tree -r $TEST_DEV | \
grep extent | awk '{print $7}'`
if [ -z $extent_root_bytenr ];then
_fail "fail to get extent root bytenr"
fi
# corrupt extent root node block
run_check $SUDO_HELPER $TOP/btrfs-corrupt-block -l $extent_root_bytenr \
-b 4096 $TEST_DEV
$SUDO_HELPER $TOP/btrfs check $TEST_DEV >& /dev/null && \
_fail "btrfs check should detect failure"
run_check $SUDO_HELPER $TOP/btrfs check --init-extent-tree $TEST_DEV
run_check $SUDO_HELPER $TOP/btrfs check $TEST_DEV
}
test_extent_tree_rebuild
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