/src/t_dir_offset2
/src/t_dir_type
/src/t_encrypted_d_revalidate
+/src/t_ext4_dax_journal_corruption
/src/t_futimens
/src/t_getcwd
/src/t_holes
multi_open_unlink dmiperf unwritten_sync genhashnames t_holes \
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_mmap_cow_race t_mmap_fallocate fsync-err t_mmap_write_ro \
+ t_ext4_dax_journal_corruption
LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \
preallo_rw_pattern_writer ftrunc trunc fs_perms testx looptest \
--- /dev/null
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#define PAGE(a) ((a)*0x1000)
+#define STRLEN 256
+
+void err_exit(char *op)
+{
+ fprintf(stderr, "%s: %s\n", op, strerror(errno));
+ exit(1);
+}
+
+void chattr_cmd(char *chattr, char *cmd, char *file)
+{
+ int ret;
+ char command[STRLEN];
+
+ ret = snprintf(command, STRLEN, "%s %s %s 2>/dev/null", chattr, cmd, file);
+ if (ret < 0)
+ err_exit("snprintf");
+
+ ret = system(command);
+ if (ret) /* Success - the kernel fix is to have this chattr fail */
+ exit(77);
+}
+
+int main(int argc, char *argv[])
+{
+ int fd, err, len = PAGE(1);
+ char *data, *dax_data, *chattr, *file;
+ char string[STRLEN];
+
+ if (argc < 3) {
+ printf("Usage: %s <chattr program> <file>\n", basename(argv[0]));
+ exit(0);
+ }
+
+ chattr = argv[1];
+ file = argv[2];
+
+ srand(time(NULL));
+ snprintf(string, STRLEN, "random number %d\n", rand());
+
+ fd = open(file, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
+ if (fd < 0)
+ err_exit("fd");
+
+ /* begin with journaling off and DAX on */
+ chattr_cmd(chattr, "-j", file);
+
+ ftruncate(fd, 0);
+ fallocate(fd, 0, 0, len);
+
+ dax_data = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
+ if (!dax_data)
+ err_exit("mmap dax_data");
+
+ /*
+ * This turns on journaling. It also has the side-effect that it
+ * turns off DAX for the given inode since journaling and DAX aren't
+ * allowed to be on at the same time. This happens in
+ * ext4_change_inode_journal_flag() in kernel v4.14 and before.
+ *
+ * Note that this turns off the runtime DAX flag (S_DAX) in the
+ * in-memory inode, and has nothing to do with per-inode on-media DAX
+ * inode flags.
+ */
+ chattr_cmd(chattr, "+j", file);
+
+ data = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+ if (!data)
+ err_exit("mmap 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(data, len);
+ if (err < 0)
+ err_exit("munmap data");
+
+ err = munmap(dax_data, len);
+ if (err < 0)
+ err_exit("munmap dax_data");
+
+ err = close(fd);
+ if (err < 0)
+ err_exit("close");
+ return 0;
+}
--- /dev/null
+#! /bin/bash
+# FS QA Test ext4/030
+#
+# This is a regression test for kernel patch:
+# ext4: prevent data corruption with journaling + DAX
+# created by Ross Zwisler <ross.zwisler@linux.intel.com>
+#
+#-----------------------------------------------------------------------
+# 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 $seqres.full
+
+# Modify as appropriate.
+_supported_os Linux
+_supported_fs ext4
+_require_scratch_dax
+_require_test_program "t_ext4_dax_journal_corruption"
+_require_command "$CHATTR_PROG" chattr
+
+# real QA test starts here
+_scratch_mkfs > $seqres.full 2>&1
+
+# In order to get our failure condition consistently we need to turn off
+# delayed allocation. With delayed allocation on this simple test will pass,
+# but we would almost certainly see data corruption down the road as the
+# contents of the journal would conflict with the DAX data.
+_scratch_mount "-o dax,nodelalloc" >> $seqres.full 2>&1
+
+$here/src/t_ext4_dax_journal_corruption $CHATTR_PROG $SCRATCH_MNT/testfile
+
+if [[ $? != 0 && $? != 77 ]]; then
+ echo "Test failed, status $?"
+ exit 1
+fi
+
+# success, all done
+echo "Silence is golden"
+status=0
+exit
--- /dev/null
+QA output created by 030
+Silence is golden
027 auto quick fsmap
028 auto quick fsmap
029 auto quick fsmap
+030 auto quick dax
271 auto rw quick
301 aio auto ioctl rw stress defrag
302 aio auto ioctl rw stress defrag