This tests ensures that the kernel correctly persists backup roots in case the filesystem has been mounted from a backup root.
Signed-off-by: Nikolay Borisov <[email protected]> --- .../misc-tests/038-backup-root-corruption/test.sh | 50 ++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100755 tests/misc-tests/038-backup-root-corruption/test.sh diff --git a/tests/misc-tests/038-backup-root-corruption/test.sh b/tests/misc-tests/038-backup-root-corruption/test.sh new file mode 100755 index 000000000000..2fb117b3a928 --- /dev/null +++ b/tests/misc-tests/038-backup-root-corruption/test.sh @@ -0,0 +1,50 @@ +#!/bin/bash +# Test that a corrupted filesystem will correctly handle writing of +# backup root + +source "$TEST_TOP/common" + +check_prereq mkfs.btrfs +check_prereq btrfs +check_prereq btrfs-corrupt-block + +setup_loopdevs 1 +prepare_loopdevs +dev=${loopdevs[1]} + +run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$dev" + +# Create a file and unmount to commit some backup roots +run_check $SUDO_HELPER mount "$dev" "$TEST_MNT" +run_check touch "$TEST_MNT/file" && sync +run_check $SUDO_HELPER umount "$TEST_MNT" + +# Ensure currently active backup slot is the expected one (slot 3) +backup2_root_ptr=$($SUDO_HELPER "$TOP/btrfs" inspect-internal dump-super -f "$dev" \ + | grep -A1 "backup 2" | grep backup_tree_root | awk '{print $2}') + +main_root_ptr=$($SUDO_HELPER "$TOP/btrfs" inspect-internal dump-super -f "$dev" \ + | grep root | head -n1 | awk '{print $2}') + +[[ "$backup2_root_ptr" -eq "$main_root_ptr" ]] || _fail "Backup slot 2 is not in use" + +run_check "$TOP/btrfs-corrupt-block" -m $main_root_ptr -f generation "$dev" + +## should fail because the root is corrupted +run_mustfail "Unexpected successful mount" $SUDO_HELPER mount "$dev" "$TEST_MNT" + +# Cycle mount with the backup to force rewrite of slot 3 +run_check $SUDO_HELPER mount -ousebackuproot "$dev" "$TEST_MNT" +run_check $SUDO_HELPER umount "$TEST_MNT" + + +# Since we've used backup 1 as the usable root, then backup 2 should have been +# overwritten +main_root_ptr=$($SUDO_HELPER "$TOP/btrfs" inspect-internal dump-super -f "$dev" \ + | grep root | head -n1 | awk '{print $2}') +backup2_new_root_ptr=$($SUDO_HELPER "$TOP/btrfs" inspect-internal dump-super -f "$dev" \ + | grep -A1 "backup 2" | grep backup_tree_root | awk '{print $2}') + +[[ "$backup2_root_ptr" -ne "$backup2_new_root_ptr" ]] || _fail "Backup 2 not overwritten" + +cleanup_loopdevs -- 2.7.4
