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#!/bin/bash
#
# Corrupt primary superblock and restore it using backup superblock.
source "$TEST_TOP/common" || exit
check_prereq btrfs-select-super
check_prereq btrfs
setup_root_helper
prepare_test_dev
FIRST_SUPERBLOCK_OFFSET=65536
test_superblock_restore()
{
local seek
run_check_mkfs_test_dev
# Corrupt superblock checksum
run_check $SUDO_HELPER dd if=/dev/zero of="$TEST_DEV" \
seek="$FIRST_SUPERBLOCK_OFFSET" bs=1 count=4 conv=notrunc
# Run btrfs check to detect corruption
run_mayfail "$TOP/btrfs" check "$TEST_DEV" && \
_fail "btrfs check should detect corruption"
# Copy backup superblock to primary
run_check "$INTERNAL_BIN/btrfs-select-super" -s 1 "$TEST_DEV"
# Perform btrfs check
run_check "$TOP/btrfs" check "$TEST_DEV"
}
test_superblock_restore
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