65 lines
2.1 KiB
Bash
Executable File
65 lines
2.1 KiB
Bash
Executable File
#!/bin/bash
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# Test that a corrupted filesystem will correctly handle writing of backup root
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source "$TEST_TOP/common" || exit
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check_prereq mkfs.btrfs
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check_prereq btrfs
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check_prereq btrfs-corrupt-block
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setup_root_helper
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prepare_test_dev
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# Create a file and unmount to commit some backup roots
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run_check_mkfs_test_dev
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run_check_mount_test_dev
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run_check $SUDO_HELPER touch "$TEST_MNT/file"
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run_check_umount_test_dev
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dump_super() {
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# In this test, we will dump super block multiple times, while the
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# existing run_check*() helpers will always dump all the output into
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# the log, flooding the log and hiding the important info.
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# Thus here we call "btrfs" directly.
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$SUDO_HELPER "$TOP/btrfs" inspect-internal dump-super -f "$TEST_DEV"
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}
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main_root_ptr=$(dump_super | awk '/^root\t/{print $2}')
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# Grab current fs generation, and it will be used to determine which backup
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# slot to use
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cur_gen=$(dump_super | grep ^generation | awk '{print $2}')
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backup_gen=$(($cur_gen - 1))
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# Grab the slot which matches @backup_gen
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found=$(dump_super | grep backup_tree_root | grep -n "gen: $backup_gen")
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if [ -z "$found" ]; then
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_fail "Unable to find a backup slot with generation $backup_gen"
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fi
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slot_num=$(echo $found | cut -f1 -d:)
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# To follow the dump-super output, where backup slot starts at 0.
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slot_num=$(($slot_num - 1))
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# Save the backup slot info into the log
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_log "Backup slot $slot_num will be utilized"
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dump_super | run_check grep -A9 "backup $slot_num:"
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run_check "$INTERNAL_BIN/btrfs-corrupt-block" -m "$main_root_ptr" -f generation "$TEST_DEV"
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# Should fail because the root is corrupted
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run_mustfail "Unexpected successful mount" \
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$SUDO_HELPER mount "$TEST_DEV" "$TEST_MNT"
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# Cycle mount with the backup to force rewrite of slot 3
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run_check_mount_test_dev -o usebackuproot
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run_check_umount_test_dev
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main_root_ptr=$(dump_super | awk '/^root\t/{print $2}')
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# The next slot should be overwritten
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slot_num=$(( ($slot_num + 1) % 4 ))
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backup_new_root_ptr=$(dump_super | grep -A1 "backup $slot_num" | grep backup_tree_root | awk '{print $2}')
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[ "$main_root_ptr" -ne "$backup_new_root_ptr" ] || _fail "Backup 2 not overwritten"
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