Run delalloc writes & append writes & non-data-integrity syncs concurrently to test the race between block map change vs writeback. This is to cover an XFS bug that data could be written to wrong block and delay allocated blocks are leaked because the block map was changed due to the removal of speculative allocated eofblocks when writeback is in progress. And this test partially mimics what lustre-racer[1] test does, using which this bug was first found. [1] https://git.hpdd.intel.com/?p=fs/lustre-release.git;a=tree;f=lustre/tests/racer;hb=HEAD Signed-off-by: Eryu Guan <eguan@xxxxxxxxxx> --- v2: - reduce LOOP_CNT to save some run time - fix line over 80 chars tests/generic/463 | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++ tests/generic/463.out | 2 + tests/generic/group | 1 + 3 files changed, 134 insertions(+) create mode 100755 tests/generic/463 create mode 100644 tests/generic/463.out diff --git a/tests/generic/463 b/tests/generic/463 new file mode 100755 index 000000000000..7ab551bacf94 --- /dev/null +++ b/tests/generic/463 @@ -0,0 +1,131 @@ +#! /bin/bash +# FS QA Test 463 +# +# Run delalloc writes & append writes & non-data-integrity syncs concurrently +# to test the race between block map change vs writeback. +# +#----------------------------------------------------------------------- +# Copyright (c) 2017 Red Hat Inc. All Rights Reserved. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +#----------------------------------------------------------------------- +# + +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" + +here=`pwd` +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + cd / + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +MAXFILES=200 +BLOCK_SZ=65536 + +LOOP_CNT=10 +LOOP_TIME=5 +PROC_CNT=16 + +stop=$tmp.stop + +# get a random file to work on +getfile() +{ + echo $SCRATCH_MNT/$((RANDOM % MAXFILES)) +} + +# delalloc write a relative big file to get enough dirty pages to be written +# back, and XFS needs big enough file to trigger speculative preallocations, so +# freeing these eofblocks could change the extent record +do_write() +{ + local blockcount=$((RANDOM % 100)) + local filesize=$((blockcount * BLOCK_SZ)) + $XFS_IO_PROG -ftc "pwrite -b $BLOCK_SZ 0 $filesize" `getfile` \ + >/dev/null 2>&1 +} + +# append another dirty page to the file, the writeback might pick it up too if +# the file is already under writeback +do_append() +{ + echo "test string" >> `getfile` +} + +# issue WB_SYNC_NONE writeback with the '-w' option of sync_range xfs_io +# command, so that the last dirty page from append write can be picked up in +# this writeback cycle. This is not mandatory but could help reproduce XFS +# corruption more easily. +do_writeback() +{ + $XFS_IO_PROG -c "sync_range -w 0 0" `getfile` >/dev/null 2>&1 +} + +# remove previous $seqres.full before test +rm -f $seqres.full + +# real QA test starts here +_supported_fs generic +_supported_os Linux +# do fsck after each iteration in test +_require_scratch_nocheck +_require_xfs_io_command "sync_range" + +_scratch_mkfs >>$seqres.full 2>&1 +_scratch_mount + +# loop for $LOOP_CNT iterations, and each iteration starts $PROC_CNT processes +# for each operation and runs for $LOOP_TIME seconds, and check filesystem +# consistency after each iteration +for i in `seq 1 $LOOP_CNT`; do + rm -f $stop + for j in `seq 1 $PROC_CNT`; do + while [ ! -e $stop ]; do + do_write + done & + + while [ ! -e $stop ]; do + do_append + done & + + while [ ! -e $stop ]; do + do_writeback + done & + done + sleep $LOOP_TIME + touch $stop + wait + + _scratch_unmount + # test exits here if fs is inconsistent + _check_scratch_fs + _scratch_mount +done + +echo "Silence is golden" + +# success, all done +status=0 +exit diff --git a/tests/generic/463.out b/tests/generic/463.out new file mode 100644 index 000000000000..dd61371a26d4 --- /dev/null +++ b/tests/generic/463.out @@ -0,0 +1,2 @@ +QA output created by 463 +Silence is golden diff --git a/tests/generic/group b/tests/generic/group index f2a6cdadf130..9f173e7a63c9 100644 --- a/tests/generic/group +++ b/tests/generic/group @@ -465,3 +465,4 @@ 460 auto quick rw 461 auto shutdown stress 462 auto quick dax +463 auto rw -- 2.13.6 -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
