From: Ross Zwisler Date: Thu, 4 Jan 2018 08:11:21 +0000 (-0700) Subject: ext4: test for inline data + DAX corruption X-Git-Tag: v2022.05.01~1712 X-Git-Url: http://git.apps.os.sepia.ceph.com/?p=xfstests-dev.git;a=commitdiff_plain;h=95c924c65113d2b706436d8cd09cd391eddb795a ext4: test for inline data + DAX corruption Add a regression test for the following kernel commit: ext4: prevent data corruption with inline data + DAX The test passes either if we don't encounter corruption, or if mounting with DAX + inline data fails. The latter is the way that we prevent this issue in the kernel. [eguan: add 'dax' group] Signed-off-by: Ross Zwisler Reviewed-by: Eryu Guan Signed-off-by: Eryu Guan --- diff --git a/.gitignore b/.gitignore index 840e4fe4..ee7eaed0 100644 --- a/.gitignore +++ b/.gitignore @@ -115,6 +115,7 @@ /src/t_dir_offset2 /src/t_dir_type /src/t_encrypted_d_revalidate +/src/t_ext4_dax_inline_corruption /src/t_ext4_dax_journal_corruption /src/t_futimens /src/t_getcwd diff --git a/src/Makefile b/src/Makefile index 86c5440c..b96b8cf2 100644 --- a/src/Makefile +++ b/src/Makefile @@ -14,7 +14,7 @@ TARGETS = dirstress fill fill2 getpagesize holes lstat64 \ t_mmap_writev t_truncate_cmtime dirhash_collide t_rename_overwrite \ holetest t_truncate_self t_mmap_dio af_unix t_mmap_stale_pmd \ t_mmap_cow_race t_mmap_fallocate fsync-err t_mmap_write_ro \ - t_ext4_dax_journal_corruption + t_ext4_dax_journal_corruption t_ext4_dax_inline_corruption LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \ preallo_rw_pattern_writer ftrunc trunc fs_perms testx looptest \ diff --git a/src/t_ext4_dax_inline_corruption.c b/src/t_ext4_dax_inline_corruption.c new file mode 100644 index 00000000..4b7d8938 --- /dev/null +++ b/src/t_ext4_dax_inline_corruption.c @@ -0,0 +1,70 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PAGE(a) ((a)*0x1000) +#define STRLEN 256 + +void err_exit(char *op) +{ + fprintf(stderr, "%s: %s\n", op, strerror(errno)); + exit(1); +} + +int main(int argc, char *argv[]) +{ + int fd, err, len = PAGE(1); + char *dax_data, *data; + char string[STRLEN]; + + if (argc < 2) { + printf("Usage: %s \n", basename(argv[0])); + exit(0); + } + + srand(time(NULL)); + snprintf(string, STRLEN, "random number %d\n", rand()); + + fd = open(argv[1], O_RDWR); + if (fd < 0) + err_exit("fd"); + + data = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); + if (!data) + err_exit("mmap data"); + + /* this fallocate turns off inline data and turns on DAX */ + fallocate(fd, 0, 0, PAGE(2)); + + dax_data = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); + if (!dax_data) + err_exit("mmap dax_data"); + + /* + * Write the data using the non-DAX mapping, and try and read it back + * using the DAX mapping. + */ + strcpy(data, string); + if (strcmp(dax_data, string) != 0) + printf("Data miscompare\n"); + + err = munmap(dax_data, len); + if (err < 0) + err_exit("munmap dax_data"); + + err = munmap(data, len); + if (err < 0) + err_exit("munmap data"); + + err = close(fd); + if (err < 0) + err_exit("close"); + return 0; +} diff --git a/tests/ext4/031 b/tests/ext4/031 new file mode 100755 index 00000000..58177b44 --- /dev/null +++ b/tests/ext4/031 @@ -0,0 +1,86 @@ +#! /bin/bash +# FS QA Test ext4/031 +# +# This is a regression test for kernel patch: +# ext4: prevent data corruption with inline data + DAX +# created by Ross Zwisler +# +#----------------------------------------------------------------------- +# Copyright (c) 2017-2018 Intel Corporation. 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 + +# remove previous $seqres.full before test +rm -f $seqres.full + +# DAX needs to be off so we can create an inode with inline data +SAVE_MOUNT_OPTIONS="$MOUNT_OPTIONS" +MOUNT_OPTIONS="" + +# Modify as appropriate. +_supported_os Linux +_supported_fs ext4 +_require_scratch_dax +_require_test_program "t_ext4_dax_inline_corruption" +_require_scratch_ext4_feature "inline_data" + +# real QA test starts here +_scratch_mkfs_ext4 -O inline_data > $seqres.full 2>&1 + +TESTFILE=$SCRATCH_MNT/testfile + +_scratch_mount >> $seqres.full 2>&1 + +echo "Need to make some inline data..." > $TESTFILE + +export MOUNT_OPTIONS="$SAVE_MOUNT_OPTIONS" + +_scratch_unmount >> $seqres.full 2>&1 +_scratch_mount "-o dax" >> $seqres.full 2>&1 + +if [[ $? != 0 ]]; then + # _require_scratch_dax already verified that we could mount with DAX. + # Failure here is expected because we have inline data. + echo "Silence is golden" + status=0 + exit +fi + +$here/src/t_ext4_dax_inline_corruption $TESTFILE + +# success, all done +echo "Silence is golden" +status=0 +exit diff --git a/tests/ext4/031.out b/tests/ext4/031.out new file mode 100644 index 00000000..b3d0bb03 --- /dev/null +++ b/tests/ext4/031.out @@ -0,0 +1,2 @@ +QA output created by 031 +Silence is golden diff --git a/tests/ext4/group b/tests/ext4/group index 9c93bcee..bab4f785 100644 --- a/tests/ext4/group +++ b/tests/ext4/group @@ -33,6 +33,7 @@ 028 auto quick fsmap 029 auto quick fsmap 030 auto quick dax +031 auto quick dax 271 auto rw quick 301 aio auto ioctl rw stress defrag 302 aio auto ioctl rw stress defrag