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#!/bin/bash
# Test that any superblock is correctly detected and fixed by btrfs rescue
source "$TOP/tests/common"
check_prereq btrfs
check_prereq mkfs.btrfs
check_prereq btrfs-select-super
setup_root_helper
prepare_test_dev 260G
# Create the test file system.
run_check $SUDO_HELPER "$TOP"/mkfs.btrfs -f "$TEST_DEV"
function check_corruption {
local sb_offset=$1
local source_sb=$2
# First we ensure we can mount it successfully
run_check_mount_test_dev
run_check_umount_test_dev
# Now corrupt 1k of the superblock at sb_offset
run_check $SUDO_HELPER dd bs=1K count=1 seek=$(($sb_offset + 1)) if=/dev/zero of="$TEST_DEV" conv=notrunc
# if corrupting one of the sb copies, copy it over the initial superblock
if [ ! -z $source_sb ]; then
local shift_val=$((16 << $source_sb * 12 ))
run_check $SUDO_HELPER dd bs=1K count=4 seek=64 skip=$shift_val if="$TEST_DEV" of="$TEST_DEV" conv=notrunc
fi
# we can't use our mount helper, the following works for file image and
# block device as TEST_DEV
run_mustfail "mounted fs with corrupted superblock" \
$SUDO_HELPER mount "$TEST_DEV" "$TEST_MNT"
# Now run btrfs rescue which should fix the superblock. It uses 2
# to signal success of recovery use mayfail to ignore that retval
# but still log the output of the command
run_mayfail $SUDO_HELPER "$TOP"/btrfs rescue super-recover -yv "$TEST_DEV"
if [ $? != 2 ]; then
_fail "couldn't rescue super"
fi
run_check_mount_test_dev
run_check_umount_test_dev
}
# Corrupting first superblock
check_corruption 64
# Corrupting second superblock
check_corruption 65536 1
# Corrupting third superblock
check_corruption 268435456 2
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