tests/misc-tests/020-fix-superblock-corruption/test.sh

   1 #!/bin/bash
   2 #
   3 # Corrupt primary superblock and restore it using backup superblock.
   4
   5 source "$TEST_TOP/common"
   6
   7 check_prereq btrfs-select-super
   8 check_prereq btrfs
   9
  10 setup_root_helper
  11 prepare_test_dev
  12
  13 FIRST_SUPERBLOCK_OFFSET=65536
  14
  15 test_superblock_restore()
  16 {
  17         run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$TEST_DEV"
  18
  19         # Corrupt superblock checksum
  20         run_check $SUDO_HELPER dd if=/dev/zero of="$TEST_DEV" \
  21         seek="$FIRST_SUPERBLOCK_OFFSET" bs=1 count=4 conv=notrunc
  22
  23         # Run btrfs check to detect corruption
  24         run_mayfail "$TOP/btrfs" check "$TEST_DEV" && \
  25                 _fail "btrfs check should detect corruption"
  26
  27         # Copy backup superblock to primary
  28         run_check "$TOP/btrfs-select-super" -s 1 "$TEST_DEV"
  29
  30         # Perform btrfs check
  31         run_check "$TOP/btrfs" check "$TEST_DEV"
  32 }
  33
  34 test_superblock_restore