Test script to create file with specific data-stripe layout.Computes stripe locations. Inject corruption into data-stripe and verify scrubbing process fixes corrupted block. It also validates the corresponding parity stripe.
Signed-off-by: Lakshmipathi.G <[email protected]> --- .../test.sh | 402 +++++++++++++++++++++ 1 file changed, 402 insertions(+) create mode 100755 tests/misc-tests/020-raid5-datastripe-corruption-parity-check/test.sh diff --git a/tests/misc-tests/020-raid5-datastripe-corruption-parity-check/test.sh b/tests/misc-tests/020-raid5-datastripe-corruption-parity-check/test.sh new file mode 100755 index 0000000..0129a75 --- /dev/null +++ b/tests/misc-tests/020-raid5-datastripe-corruption-parity-check/test.sh @@ -0,0 +1,402 @@ +#!/bin/bash +# +# Raid5: Inject data stripe corruption and fix them using scrub. +# +# Script will perform the following: +# 1) Create Raid5 using 3 loopback devices. +# 2) Ensure file layout is created in a predictable manner. +# Each data stripe(64KB) should uniquely start with 'DNxxxx', +# where N represents the data stripe number.(ex:D0xxxx,D1xxxx etc) +# 3) Once file is created with specific layout, check whether file +# has single extent. At the moment, script wont handle multi-extent +# files. +# 4) If file has single extent with the help of 'dump-tree' compute data and +# parity stripe details like devicename, position and actual on-disk data. +# 5) $STRIPEINFO_COMPLETE file will have all necessary data at this stage. +# 6) Inject corruption into given data-stripe by zero'ing out its first 4 bytes. +# 7) After injecting corruption, running online-scrub is expected to fix +# the corrupted data stripe with the help of parity block and +# corresponding data stripe. +# 8) If scrub successful, verify the data stripe has original un-corrupted value. +# 9) If scrub successful, verify parity stripe is valid, otherwise its a parity bug. +# 10) If no issues found, cleanup files and devices. Repeat the process for +# different file size and data-stripe. +# +# Note: This script corrupts only data-stripe blocks. +# Known Limitations (will be addressed later): +# - Script expects even number of data-stripes in file. +# - Script expects the file to have single extent. + +source $TOP/tests/common + +check_prereq btrfs +check_prereq mkfs.btrfs +check_prereq btrfs-debugfs + +setup_root_helper +prepare_test_dev 1024M + +ndevs=3 +declare -a devs +declare -a parity_offsets +stripe_entry="" +device_name="" +stripe_offset="" +stripe_content="" + +#Complete stripe layout +STRIPEINFO_COMPLETE=$(mktemp --tmpdir btrfs-progs-raid5-stripe-complete.infoXXXXXX) +#dump-tree output file +DUMPTREE_OUTPUT=$(mktemp --tmpdir btrfs-progs-raid5-tree-dump.infoXXXXXX) +#tmp files +STRIPEINFO_PARTIAL=$(mktemp --tmpdir btrfs-progs-raid5-stripe-partial.infoXXXXXX) +STRIPE_TMP=$(mktemp --tmpdir btrfs-progs-raid5-stripetmp.infoXXXXXX) +MULTI_EXTENT_CHECK=$(mktemp --tmpdir btrfs-progs-raid5-extent-check.infoXXXXXX) +EXTENT_WITH_SIZE=$(mktemp --tmpdir btrfs-progs-raid5-extent-size.infoXXXXXX) +PARITY_LOC1=$(mktemp --tmpdir btrfs-progs-raid5-parity-loc1.infoXXXXXX) +PARITY_LOCATION=$(mktemp --tmpdir btrfs-progs-raid5-parity-locations.infoXXXXXX) + + +prepare_devices() +{ + for i in `seq $ndevs`; do + touch img$i + chmod a+rw img$i + truncate -s0 img$i + truncate -s512M img$i + devs[$i]=`run_check_stdout $SUDO_HELPER losetup --find --show img$i` + done + truncate -s0 $STRIPE_TMP + truncate -s0 $STRIPEINFO_PARTIAL + truncate -s0 $STRIPEINFO_COMPLETE +} + +cleanup_devices() +{ + for dev in ${devs[@]}; do + run_check $SUDO_HELPER losetup -d $dev + done + for i in `seq $ndevs`; do + truncate -s0 img$i + done + run_check $SUDO_HELPER losetup --all +} + +test_do_mkfs() +{ + run_check $SUDO_HELPER $TOP/mkfs.btrfs -f \ + $@ +} + +test_mkfs_multi() +{ + test_do_mkfs $@ ${devs[@]} +} + +#$1 Filename +#$2 Expected no.of data stripes for the file. +create_layout(){ + fname=$1 + size=$(( $2 * 65536 )) + n=0 + bs_value=1 + stripe=0 + while (( $n < $size )) + do + if [ $(( $n % 65536 )) -eq 0 ]; then + val='D'$stripe + echo -n $val + stripe=$(( $stripe+1 )) + # ensure proper value + bs_value=`echo "${#val}"` + else + echo -n 'x' + bs_value=1 + fi + n=$(( $n+$bs_value )) + done | dd of=/tmp/$fname bs=$bs_value conv=notrunc &> /dev/null + cp /tmp/$fname $TEST_MNT + rm -f /tmp/$fname +} + +# $1,$2,$3 - available device offsets +find_parity_device(){ + parity_offsets[1]=$1 + parity_offsets[2]=$2 + parity_offsets[3]=$3 + pdev="" + + for dev in ${devs[@]}; do + grep $dev $STRIPEINFO_PARTIAL &>/dev/null + if [ $? -ne 0 ];then + pdev=$dev + fi + done + #find parity location + truncate -s0 $PARITY_LOC1 + truncate -s0 $PARITY_LOCATION + awk -F'|' '{print $2}' $STRIPEINFO_PARTIAL > $PARITY_LOC1 + + for addr in ${parity_offsets[@]}; do + echo $addr >> $PARITY_LOCATION + done + sort $PARITY_LOCATION -o $PARITY_LOCATION + sort $PARITY_LOC1 -o $PARITY_LOC1 + + poffset=$(comm -23 $PARITY_LOCATION $PARITY_LOC1) + pdata=$($SUDO_HELPER dd 2>/dev/null if=$pdev bs=1 \ + count=16 skip=$poffset | hexdump -e '16/1 "%02x" "\n"') + echo "$pdev|$poffset|$pdata" >> $STRIPEINFO_PARTIAL +} + +# $1 - physical address +# $2 - pattern/digit to search +get_stripe_contents(){ + pysical_addr=$1 + search_digit=$2 + + for dev in ${devs[@]}; do + stripe_data=$($SUDO_HELPER dd 2>/dev/null if=$dev bs=1 \ + count=16 skip=$pysical_addr) + echo $stripe_data | grep -E "D${search_digit}xxx" &>/dev/null + if [ $? -eq 0 ]; then + touch $STRIPE_TMP + echo "$dev|$pysical_addr|$stripe_data" >> $STRIPE_TMP + return 42 + fi + done +} + +#$1 - logical addr +#$2 - total stripes +logical_to_pysical(){ + logical_addr=$1 + total_stripe=$2 + + chunk_startaddr=$(cat $DUMPTREE_OUTPUT | grep -A3 "FIRST_CHUNK_TREE CHUNK_ITEM" | \ + grep -B1 "\ DATA|RAID" | grep "FIRST_CHUNK_TREE" | \ + sed -n -r 's/.*CHUNK_ITEM (.*)\) itemoff .*/\1/p') + chunk_length=$(cat $DUMPTREE_OUTPUT | grep -A3 "FIRST_CHUNK_TREE CHUNK_ITEM" | \ + grep "\ DATA|RAID" | sed -n -r 's/.*length (.*) owner .*/\1/p') + + + stripe1_start=$(cat $DUMPTREE_OUTPUT | \ + grep -A10 "FIRST_CHUNK_TREE CHUNK_ITEM $chunk_startaddr" | grep "offset" | \ + awk '{print $6}' | tail -n3 | head -n1) + stripe2_start=$(cat $DUMPTREE_OUTPUT | \ + grep -A10 "FIRST_CHUNK_TREE CHUNK_ITEM $chunk_startaddr" | grep "offset" | \ + awk '{print $6}' | tail -n2 | head -n1) + stripe3_start=$(cat $DUMPTREE_OUTPUT | \ + grep -A10 "FIRST_CHUNK_TREE CHUNK_ITEM $chunk_startaddr" | grep "offset" | \ + awk '{print $6}' | tail -n1 | head -n1) + + #search_single_extent $logical_addr + chunk_offset=$(( $logical_addr - $chunk_startaddr )) + chunk_slot=$(( $chunk_offset / 131072 )) + + ds1_pysical_addr=$(( $stripe1_start + $chunk_slot * 65536 )) + ds2_pysical_addr=$(( $stripe2_start + $chunk_slot * 65536 )) + ds3_pysical_addr=$(( $stripe3_start + $chunk_slot * 65536 )) + + d1=0 + while (( $total_stripe > 1)) + do + for addr in $ds1_pysical_addr $ds2_pysical_addr $ds3_pysical_addr; do + get_stripe_contents $addr $d1 + fun_ret=$? + if [ $fun_ret == 42 ];then + break + fi + done + # Search 2nd data-stripe + d1=$(( $d1 + 1 )) + for addr in $ds1_pysical_addr $ds2_pysical_addr $ds3_pysical_addr; do + get_stripe_contents $addr $d1 + fun_ret=$? + if [ $fun_ret == 42 ];then + break + fi + done + d1=$(( $d1 + 1 )) + #Find parity device + uniq $STRIPE_TMP > $STRIPEINFO_PARTIAL + find_parity_device $ds1_pysical_addr $ds2_pysical_addr $ds3_pysical_addr + cat $STRIPEINFO_PARTIAL >> $STRIPEINFO_COMPLETE + truncate -s0 $STRIPE_TMP + truncate -s0 $STRIPEINFO_PARTIAL + total_stripe=$(( $total_stripe - 2 )) + ds1_pysical_addr=$(( $ds1_pysical_addr + 65536 )) + ds2_pysical_addr=$(( $ds2_pysical_addr + 65536 )) + ds3_pysical_addr=$(( $ds3_pysical_addr + 65536 )) + done +} + +#$1 - Total no.of chunks +#$2 - loop dev +#$3 - filename +gather_stripe_info(){ + total_stripe=$1 + loop_dev=$2 + filename=$3 + + sleep 2 + run_check_stdout $SUDO_HELPER $TOP/btrfs inspect-internal dump-tree $loop_dev > "$DUMPTREE_OUTPUT" + $TOP/btrfs-debugfs -f $TEST_MNT/$filename &> "$MULTI_EXTENT_CHECK" + cat $MULTI_EXTENT_CHECK | awk '{print $6 "-" $4}' | grep -v '[a-z]' > "$EXTENT_WITH_SIZE" + extents_count=$(cat $EXTENT_WITH_SIZE | wc -l) + + if [ $extents_count -ne 1 ];then + echo "File with multiple extents found." + for item in `cat $EXTENT_WITH_SIZE`;do + logical_addr=$(echo $item | awk -F'-' {'print $1'}) + len=$(echo $item | awk -F'-' {'print $2'}) + total_stripe=$(( $len / 65536 )) + echo "logical_addr is $logical_addr and leng=$len and total_stripe=$total_stripe"; + done + _fail "Script doesnt handle multiple extents.Re-try again." + else + echo "Single extent found." >> "$RESULTS" + logical_addr=$(awk -F'-' '{print $1}' $EXTENT_WITH_SIZE) + len=$(awk -F'-' '{print $2}' $EXTENT_WITH_SIZE) + total_stripe=$(( $len / 65536 )) + echo "logical_addr: $logical_addr length=$len \ + total_stripe=$total_stripe" >> "$RESULTS" + logical_to_pysical $logical_addr $total_stripe + fi +} + +#Corrupt given data stripe +corrupt_data_stripe(){ + + data_stripe_num=$1 + data_stripe_entry="D"${data_stripe_num}"xxxx" + stripe_entry=$(grep "${data_stripe_entry}" $STRIPEINFO_COMPLETE) + + #Each entry will have format like "device|position|16-byte content" + #Example: /dev/loop1|0063176704|D0xxxxxxxxxxxxxx| + device_name=$(echo $stripe_entry | awk -F"|" '{print $1}') + stripe_offset=$(echo $stripe_entry | awk -F"|" '{print $2}') + #Remove leading zeros + stripe_offset=$(echo $stripe_offset | sed 's/^0*//') + stripe_content=$(echo $stripe_entry | awk -F"|" '{print $3}') + + echo "$data_stripe_entry: Corrupting $device_name at position $stripe_offset \ + which has $stripe_content" >> "$RESULTS" + + #verify the value at this position + original_value=$($SUDO_HELPER dd 2>/dev/null if=$device_name bs=1 \ + count=16 skip=$stripe_offset) + + if [ $original_value != $stripe_content ];then + echo "$original_value != $stripe_content" + _fail "Data stripe mismatch. Possible use of incorrect block." + else + echo "Found on-disk value: $original_value " >> "$RESULTS" + fi + + #Corrupt the given data stripe + $SUDO_HELPER dd if=/dev/zero of=$device_name bs=1 count=4 \ + seek=$stripe_offset conv=notrunc &> /dev/null + + #Fetch value again. + corrupted_value=$($SUDO_HELPER dd 2>/dev/null if=$device_name \ + bs=1 count=16 skip=$stripe_offset) + + if [ $corrupted_value == $original_value ];then + echo "original:$original_value corrupted:$corrupted_value" + _fail "Corruption failed. Possible use of incorrect block." + else + echo "Corruption completed at $stripe_offset" >> "$RESULTS" + fi +} + +#Verify data stripe after scrub +verify_data_stripe(){ + + value_after_scrub=$($SUDO_HELPER dd 2>/dev/null if=$device_name bs=1 \ + count=16 skip=$stripe_offset) + if [ $value_after_scrub != $stripe_content ];then + echo "Found on-disk value: $value_after_scrub" >> "$RESULTS" + _fail "Scrub failed to fix data stripe corruption." + else + echo "Scrub corrected value: $value_after_scrub" >> "$RESULTS" + fi +} + +#Verify parity stripe count after scrub +verify_parity_stripe(){ + parity_stripe_entry=$(grep -A3 "$stripe_entry" $STRIPEINFO_COMPLETE | grep "10000000000") + parity_device_name=$(echo $parity_stripe_entry | awk -F"|" '{print $1}') + parity_stripe_offset=$(echo $parity_stripe_entry | awk -F"|" '{print $2}') + + echo "Parity_stripe_entry:$parity_stripe_entry" >> "$RESULTS" + + #Remove leading zeros + parity_stripe_offset=$(echo $parity_stripe_offset | sed 's/^0*//') + parity_stripe_content=$(echo $parity_stripe_entry | awk -F"|" '{print $3}') + + #get current parity value + parity_stripe_after_scrub=$($SUDO_HELPER dd 2>/dev/null if=$parity_device_name bs=1 \ + count=16 skip=$parity_stripe_offset | hexdump -e '16/1 "%02x" "\n"') + + echo "Parity: before=$parity_stripe_content after=$parity_stripe_after_scrub" >> "$RESULTS" + if [ "$parity_stripe_content" != "$parity_stripe_after_scrub" ];then + echo "Parity Mismatch: $parity_stripe_content $parity_stripe_after_scrub." >> "$RESULTS" + _fail "Scrub corrupted parity stripe." + else + echo "Parity stripe check passed." >> "$RESULTS" + fi +} + + +#$1 Filename +#$2 File with 'n' no.of data stripes +#$3 Data stripe to corrupt +test_raid5_datastripe_corruption(){ + filename=$1 + stripe_num=$2 + test_stripe=$3 + echo "------------------RAID5 Corruption------------------" >> "$RESULTS" + echo "Filename=$filename Total Stripes=$stripe_num \ + Data Stripe to be corrupted=$test_stripe" >> "$RESULTS" + + prepare_devices + dev1=${devs[1]} + test_mkfs_multi -d raid5 -m raid5 + run_check $SUDO_HELPER mount $dev1 $TEST_MNT + create_layout $filename $stripe_num + cd $TEST_MNT && sync && sync && echo "3" > /proc/sys/vm/drop_caches && cd - &> /dev/null + + #Gather stripe info like specific device,offset,content + gather_stripe_info $stripe_num $dev1 $filename + run_check $SUDO_HELPER umount "$TEST_MNT" + + #Inject corruption + corrupt_data_stripe $test_stripe + + #Mount the device and start scrub + run_check $SUDO_HELPER mount $dev1 $TEST_MNT + run_check $SUDO_HELPER btrfs scrub start $TEST_MNT + #Introduce delay, hopefully scrubbing will be finished. + sleep 10 + + #Validate + verify_data_stripe + verify_parity_stripe + + #cleanup + run_check $SUDO_HELPER umount "$TEST_MNT" + cleanup_devices + rm -rf $STRIPEINFO_COMPLETE $DUMPTREE_OUTPUT $STRIPEINFO_PARTIAL $STRIPE_TMP + rm -rf $MULTI_EXTENT_CHECK $EXTENT_WITH_SIZE $PARITY_LOC1 $PARITY_LOCATION +} + + +test_raid5_datastripe_corruption file128k.txt 2 1 #file with 2 stripe,corrupt 1st. +test_raid5_datastripe_corruption file256k.txt 4 3 +test_raid5_datastripe_corruption file512k.txt 8 6 +test_raid5_datastripe_corruption file768k.txt 12 10 +test_raid5_datastripe_corruption file1m.txt 16 14 #1MB file, corrupt 14th stripe. +test_raid5_datastripe_corruption file2m.txt 32 23 #2MB file, corrupt 23rd stripe +test_raid5_datastripe_corruption file4m.txt 64 34 #4MB file +test_raid5_datastripe_corruption file8m.txt 128 100 #8MB file -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
