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btrfs-progs: tests: Add test for super block recovery

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This functionality regressed some time ago and it was never caught. Seems no
one complained of that, but to be sure add a regression test to prevent future
regressions.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2017-12-05 10:39:48 +02:00 committed by David Sterba
parent 4487aa64e7
commit e764625f90
1 changed files with 64 additions and 0 deletions
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64
tests/fsck-tests/029-superblock-recovery/test.sh Executable file
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#!/bin/bash
# Test that any superblock is correctly detected
# and fixed by btrfs rescue
source "$TOP/tests/common"
check_prereq btrfs
check_prereq mkfs.btrfs
check_prereq btrfs-select-super
setup_root_helper
rm -f dev1
run_check truncate -s 260G dev1
loop=$(run_check_stdout $SUDO_HELPER losetup --find --show dev1)
# Create the test file system.
run_check $SUDO_HELPER "$TOP"/mkfs.btrfs -f "$loop"
function check_corruption {
local sb_offset=$1
local source_sb=$2
# First we ensure we can mount it successfully
run_check $SUDO_HELPER mount $loop "$TEST_MNT"
run_check $SUDO_HELPER umount "$TEST_MNT"
# Now corrupt 1k of the superblock at sb_offset
run_check $SUDO_HELPER dd bs=1K count=1 seek=$(($sb_offset + 1)) if=/dev/zero of="$loop"
#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="$loop" of="$loop"
fi
run_mustfail "Mounted fs with corrupted superblock" \
$SUDO_HELPER mount $loop "$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 "$loop"
if [ $? != 2 ]; then
_fail "couldn't rescue super"
fi
run_check $SUDO_HELPER mount $loop "$TEST_MNT"
run_check $SUDO_HELPER umount "$TEST_MNT"
}
_log "Corrupting first superblock"
check_corruption 64
_log "Corrupting second superblock"
check_corruption 65536 1
_log "Corrupting third superblock"
check_corruption 268435456 2
# Cleanup
run_check $SUDO_HELPER losetup -d "$loop"
rm -f dev1