godown resvtest writemod makeextents itrash rename \
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
+ holetest t_truncate_self t_mmap_dio af_unix t_mmap_stale_pmd \
+ t_mmap_cow_race
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 <libgen.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define MiB(a) ((a)*1024*1024)
+#define NUM_THREADS 2
+
+void err_exit(char *op)
+{
+ fprintf(stderr, "%s: %s\n", op, strerror(errno));
+ exit(1);
+}
+
+void worker_fn(void *ptr)
+{
+ char *data = (char *)ptr;
+ volatile int a;
+ int i, err;
+
+ for (i = 0; i < 10; i++) {
+ a = data[0];
+ data[0] = a;
+
+ err = madvise(data, MiB(2), MADV_DONTNEED);
+ if (err < 0)
+ err_exit("madvise");
+
+ /* Mix up the thread timings to encourage the race. */
+ err = usleep(rand() % 100);
+ if (err < 0)
+ err_exit("usleep");
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ pthread_t thread[NUM_THREADS];
+ int i, j, fd, err;
+ char *data;
+
+ if (argc < 2) {
+ printf("Usage: %s <file>\n", basename(argv[0]));
+ exit(0);
+ }
+
+ fd = open(argv[1], O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
+ if (fd < 0)
+ err_exit("fd");
+
+ /* This allows us to map a huge page. */
+ ftruncate(fd, 0);
+ ftruncate(fd, MiB(2));
+
+ /*
+ * First we set up a shared mapping. Our write will (hopefully) get
+ * the filesystem to give us a 2MiB huge page DAX mapping. We will
+ * then use this 2MiB page for our private mapping race.
+ */
+ data = mmap(NULL, MiB(2), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+ if (data == MAP_FAILED)
+ err_exit("shared mmap");
+
+ data[0] = 1;
+
+ err = munmap(data, MiB(2));
+ if (err < 0)
+ err_exit("shared munmap");
+
+ for (i = 0; i < 500; i++) {
+ data = mmap(NULL, MiB(2), PROT_READ|PROT_WRITE, MAP_PRIVATE,
+ fd, 0);
+ if (data == MAP_FAILED)
+ err_exit("private mmap");
+
+ for (j = 0; j < NUM_THREADS; j++) {
+ err = pthread_create(&thread[j], NULL,
+ (void*)&worker_fn, data);
+ if (err)
+ err_exit("pthread_create");
+ }
+
+ for (j = 0; j < NUM_THREADS; j++) {
+ err = pthread_join(thread[j], NULL);
+ if (err)
+ err_exit("pthread_join");
+ }
+
+ err = munmap(data, MiB(2));
+ if (err < 0)
+ err_exit("private munmap");
+ }
+
+ err = close(fd);
+ if (err < 0)
+ err_exit("close");
+
+ return 0;
+}
--- /dev/null
+#! /bin/bash
+# FS QA Test 437
+#
+# This is a regression test for kernel patches:
+# mm: avoid spurious 'bad pmd' warning messages
+# dax: Fix race between colliding PMD & PTE entries
+# created by Ross Zwisler <ross.zwisler@linux.intel.com>
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 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_fs generic
+_supported_os Linux
+_require_test
+_require_test_program "t_mmap_cow_race"
+
+# real QA test starts here
+src/t_mmap_cow_race $TEST_DIR/testfile
+
+# success, all done
+echo "Silence is golden"
+status=0
+exit
projects / xfstests-dev.git / commitdiff