Make sure memory failure mechanism works when filesystem is mounted with
dax option.
Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
.gitignore | 1 +
src/Makefile | 3 +-
src/t_mmap_cow_memory_failure.c | 157 ++++++++++++++++++++++++++++++++
tests/xfs/900 | 50 ++++++++++
tests/xfs/900.out | 9 ++
5 files changed, 219 insertions(+), 1 deletion(-)
create mode 100644 src/t_mmap_cow_memory_failure.c
create mode 100755 tests/xfs/900
create mode 100644 tests/xfs/900.out
diff --git a/.gitignore b/.gitignore
index c1d75b019..ad9f45437 100644
--- a/.gitignore
+++ b/.gitignore
@@ -147,6 +147,7 @@ tags
/src/t_holes
/src/t_immutable
/src/t_mmap_collision
+/src/t_mmap_cow_memory_failure
/src/t_mmap_cow_race
/src/t_mmap_dio
/src/t_mmap_fallocate
diff --git a/src/Makefile b/src/Makefile
index 665edcf9f..5f565e73c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -18,7 +18,8 @@ TARGETS = dirstress fill fill2 getpagesize holes lstat64 \
t_ext4_dax_journal_corruption t_ext4_dax_inline_corruption \
t_ofd_locks t_mmap_collision mmap-write-concurrent \
t_get_file_time t_create_short_dirs t_create_long_dirs t_enospc \
- t_mmap_writev_overlap checkpoint_journal mmap-rw-fault allocstale
+ t_mmap_writev_overlap checkpoint_journal mmap-rw-fault allocstale \
+ t_mmap_cow_memory_failure
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_mmap_cow_memory_failure.c b/src/t_mmap_cow_memory_failure.c
new file mode 100644
index 000000000..bb3fd3fbd
--- /dev/null
+++ b/src/t_mmap_cow_memory_failure.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Fujitsu Limited. All Rights Reserved. */
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <semaphore.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <sys/sem.h>
+#include <time.h>
+#include <unistd.h>
+
+sem_t *sem;
+
+void sigbus_handler(int signal)
+{
+ printf("Process is killed by signal: %d\n", signal);
+ sem_post(sem);
+}
+
+void mmap_read_file(char *filename, off_t offset, size_t size)
+{
+ int fd;
+ char *map, *dummy;
+ struct timespec ts;
+
+ fd = open(filename, O_RDWR);
+ map = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, offset);
+ dummy = malloc(size);
+
+ /* make sure page fault happens */
+ memcpy(dummy, map, size);
+
+ /* ready */
+ sem_post(sem);
+
+ usleep(200000);
+
+ clock_gettime(CLOCK_REALTIME, &ts);
+ ts.tv_sec += 3;
+ /* wait for injection done */
+ sem_timedwait(sem, &ts);
+
+ free(dummy);
+ munmap(map, size);
+ close(fd);
+}
+
+void mmap_read_file_then_poison(char *filename, off_t offset, size_t size,
+ off_t poisonOffset, size_t poisonSize)
+{
+ int fd, error;
+ char *map, *dummy;
+
+ /* wait for parent preparation done */
+ sem_wait(sem);
+
+ fd = open(filename, O_RDWR);
+ map = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, offset);
+ dummy = malloc(size);
+
+ /* make sure page fault happens */
+ memcpy(dummy, map, size);
+
+ printf("Inject poison...\n");
+ error = madvise(map + poisonOffset, poisonSize, MADV_HWPOISON);
+ if (error)
+ printf("madvise() has fault: %d, errno: %d\n", error, errno);
+
+ free(dummy);
+ munmap(map, size);
+ close(fd);
+}
+
+int main(int argc, char *argv[])
+{
+ char *pReadFile = NULL, *pPoisonFile = NULL;
+ size_t mmapSize, poisonSize;
+ off_t mmapOffset = 0, poisonOffset = 0;
+ long pagesize = sysconf(_SC_PAGESIZE);
+ int c;
+ pid_t pid;
+
+ if (pagesize < 1) {
+ fprintf(stderr, "sysconf(_SC_PAGESIZE): failed to get page size\n");
+ abort();
+ }
+
+ /* default mmap / poison size, in unit of System Page Size */
+ mmapSize = poisonSize = pagesize;
+
+ while ((c = getopt(argc, argv, "o::s::O::S::R:P:")) != -1) {
+ switch (c) {
+ /* mmap offset */
+ case 'o':
+ mmapOffset = atoi(optarg) * pagesize;
+ break;
+ /* mmap size */
+ case 's':
+ mmapSize = atoi(optarg) * pagesize;
+ break;
+ /* madvice offset */
+ case 'O':
+ poisonOffset = atoi(optarg) * pagesize;
+ break;
+ /* madvice size */
+ case 'S':
+ poisonSize = atoi(optarg) * pagesize;
+ break;
+ /* filename for mmap read */
+ case 'R':
+ pReadFile = optarg;
+ break;
+ /* filename for poison read */
+ case 'P':
+ pPoisonFile = optarg;
+ break;
+ default:
+ printf("Unknown option: %c\n", c);
+ exit(1);
+ }
+ }
+
+ if (!pReadFile || !pPoisonFile) {
+ printf("Usage: \n"
+ " %s [-o mmapOffset] [-s mmapSize] [-O mmapOffset] [-S mmapSize] -R readFile -P poisonFile\n"
+ " (offset and size are both in unit of System Page Size: %ld)\n",
+ basename(argv[0]), pagesize);
+ exit(0);
+ }
+ if (poisonSize < mmapSize)
+ mmapSize = poisonSize;
+
+ /* fork and mmap files */
+ pid = fork();
+ if (pid == 0) {
+ /* handle SIGBUS */
+ signal(SIGBUS, sigbus_handler);
+ sem = sem_open("sync", O_CREAT, 0666, 0);
+
+ /* mread & do memory failure on poison file */
+ mmap_read_file_then_poison(pPoisonFile, mmapOffset, mmapSize,
+ poisonOffset, poisonSize);
+
+ sem_close(sem);
+ } else {
+ sem = sem_open("sync", O_CREAT, 0666, 0);
+
+ /* mread read file, wait for child process to be killed */
+ mmap_read_file(pReadFile, mmapOffset, mmapSize);
+ sem_close(sem);
+ }
+ exit(0);
+}
diff --git a/tests/xfs/900 b/tests/xfs/900
new file mode 100755
index 000000000..def1ab51e
--- /dev/null
+++ b/tests/xfs/900
@@ -0,0 +1,50 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Fujitsu Limited. All Rights Reserved.
+#
+# FS QA Test No. 900
+#
+# Test memory failure mechanism when dax enabled
+#
+. ./common/preamble
+_begin_fstest auto quick dax
+
+# Import common functions.
+. ./common/filter
+. ./common/reflink
+
+# real QA test starts here
+_require_check_dmesg
+_require_scratch_reflink
+_require_cp_reflink
+_require_xfs_scratch_rmapbt
+_require_scratch_dax_mountopt "dax"
+_require_test_program "t_mmap_cow_memory_failure"
+
+echo "Format and mount"
+_scratch_mkfs > $seqres.full 2>&1
+_scratch_mount "-o dax" >> $seqres.full 2>&1
+
+testdir=$SCRATCH_MNT/test-$seq
+mkdir $testdir
+
+echo "Create the original files"
+filesize=65536
+_pwrite_byte 0x61 0 $filesize $testdir/testfile >> $seqres.full
+_scratch_cycle_mount "dax"
+
+echo "Inject memory failure (1 page)"
+# create two processes:
+# process1: mread 1 page to cause page fault, and wait
+# process2: mread 1 page to cause page fault, then inject poison on this page
+$here/src/t_mmap_cow_memory_failure -s1 -S1 -R $testdir/testfile -P $testdir/testfile
+
+echo "Inject memory failure (2 pages)"
+$here/src/t_mmap_cow_memory_failure -s2 -S2 -R $testdir/testfile -P $testdir/testfile
+
+_check_dmesg_for "Sending SIGBUS to t_mmap_cow_memo" || echo "Memory failure didn't kill the process"
+_check_dmesg_for "recovery action for dax page: Recovered" || echo "Failured page didn't recovered"
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/900.out b/tests/xfs/900.out
new file mode 100644
index 000000000..f974e59f1
--- /dev/null
+++ b/tests/xfs/900.out
@@ -0,0 +1,9 @@
+QA output created by 900
+Format and mount
+Create the original files
+Inject memory failure (1 page)
+Inject poison...
+Process is killed by signal: 7
+Inject memory failure (2 pages)
+Inject poison...
+Process is killed by signal: 7
--
2.37.1
