fstests: transport two ext4 tests from LTP
diff mbox series

Message ID CAAPJbvoLOXAMcxp9SBDNRjeegWEUJ-+P1MECekSLyZJStuJCEQ@mail.gmail.com
State New
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Series
  • fstests: transport two ext4 tests from LTP
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Commit Message

Sun Yong Nov. 1, 2019, 10:24 a.m. UTC
Recently LTP upstream removed some ext4 tests[1]. And two of them is
still valid to keep. So I transport those two tests here.

ext4-nsec-timestamps, which is used to test nanosec timestamps of
ext4, rewrite into ext4/043 and 044.
ext4-subdir-limit, which is used to test subdirectory limit of ext4,
rewrite into ext4/045.

[1] https://marc.info/?l=linux-fsdevel&m=157190623919681&w=2

Signed-off-by: Sun Yong <yosun@suse.com>
---

Patch
diff mbox series

diff --git a/src/Makefile b/src/Makefile
index ce6d8610..387293d1 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -16,7 +16,8 @@  TARGETS = dirstress fill fill2 getpagesize holes lstat64 \
     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_inline_corruption \
-    t_ofd_locks t_locks_execve t_mmap_collision mmap-write-concurrent
+    t_ofd_locks t_locks_execve t_mmap_collision mmap-write-concurrent \
+    t_ext4_file_time t_create_short_dirs t_create_long_dirs

 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_create_long_dirs.c b/src/t_create_long_dirs.c
new file mode 100644
index 00000000..72a0689a
--- /dev/null
+++ b/src/t_create_long_dirs.c
@@ -0,0 +1,136 @@ 
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
+
+#define _POSIX_C_SOURCE 200809L
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "config.h"
+
+#define NAME_LEN    255
+#define NCHARS        62
+#define MAX_LEN1    62
+#define MAX_LEN2    (62 * 62)
+#define MAX_LEN3    (62 * 62 * 62)
+
+/* valid characters for the directory name */
+char chars[NCHARS + 1] =
+    "0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
+
+/* to store the generated directory name */
+char name[NAME_LEN + 1];
+int names;
+int parent_fd;
+
+/*
+ * init_name - initialize the directory name
+ *
+ * Generate a randomized directory name, and then we generate more
+ * directory names based on it.
+ */
+void init_name(void)
+{
+    int i;
+
+    srand(time(NULL));
+
+    for (i = 0; i < NAME_LEN; i++)
+        name[i] = chars[rand() % 62];
+}
+
+void create_dir(void)
+{
+    if (mkdirat(parent_fd, name, S_IRWXU)) {
+        perror("mkdir");
+        exit(1);
+    }
+}
+
+/*
+ * create_dirs - create @names directory names
+ * @n: how many names to be created
+ *
+ * if n <= 62,       we need to modify 1 char of the name
+ * if n <= 62*62,    we need to modify 2 chars
+ * if n <= 62*62*62, we need to modify 3 chars
+ */
+void create_dirs(int n)
+{
+    int i, j, k;
+    int depth;
+
+    if (n <= MAX_LEN1)
+        depth = 1;
+    else if (n <= MAX_LEN2)
+        depth = 2;
+    else
+        depth = 3;
+
+    for (i = 0; i < NCHARS; i++) {
+        name[0] = chars[i];
+        if (depth == 1) {
+            create_dir();
+            if (--n == 0)
+                return;
+            continue;
+        }
+
+        for (j = 0; j < NCHARS; j++) {
+            name[1] = chars[j];
+            if (depth == 2) {
+                create_dir();
+                if (--n == 0)
+                    return;
+                continue;
+            }
+
+            for (k = 0; k < NCHARS; k++) {
+                name[2] = chars[k];
+                create_dir();
+                if (--n == 0)
+                    return;
+            }
+        }
+    }
+}
+
+void usage()
+{
+    fprintf(stderr, "Usage: create_long_dirs nr_dirs parent_dir\n");
+}
+
+/*
+ * Create long-name directories
+ * @argv[1]: directory number
+ * @argv[2]: parent directory
+ */
+int main(int argc, char *argv[])
+{
+    if (argc != 3) {
+        usage();
+        return 1;
+    }
+
+    names = atoi(argv[1]);
+    if (names > MAX_LEN3 || names <= 0) {
+        usage();
+        return 1;
+    }
+
+    parent_fd = open(argv[2], O_RDONLY);
+    if (parent_fd == -1) {
+        perror("open parent dir failed");
+        return 1;
+    }
+
+    init_name();
+
+    create_dirs(names);
+
+    return 0;
+}
diff --git a/src/t_create_short_dirs.c b/src/t_create_short_dirs.c
new file mode 100644
index 00000000..2725a1f0
--- /dev/null
+++ b/src/t_create_short_dirs.c
@@ -0,0 +1,139 @@ 
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
+
+#define _POSIX_C_SOURCE 200809L
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include "config.h"
+
+/* valid characters for a directory name */
+char chars[] =
"0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
+
+/* to store the generated directory name */
+char name[10];
+int names;
+int parent_fd;
+
+/* NCHARS = 10 + 26 + 26 = 62 */
+#define NCHARS        62
+#define MAX_LEN1    62
+#define MAX_LEN2    (62 * 62)
+#define MAX_LEN3    (62 * 62 * 62)
+#define MAX_NAMES    (MAX_LEN1 + MAX_LEN2 + MAX_LEN3)
+
+void create_dir(void)
+{
+    if (mkdirat(parent_fd, name, S_IRWXU)) {
+        perror("mkdir");
+        exit(1);
+    }
+}
+
+/*
+ * create_1 - create length-1 directory names
+ * @n: how name names to be created
+ */
+void create_1(int n)
+{
+    int i;
+
+    name[1] = '\0';
+    for (i = 0; i < NCHARS; i++) {
+        name[0] = chars[i];
+        create_dir();
+        if (--n == 0)
+            return;
+    }
+}
+
+/*
+ * create_2 - generate length-2 directory names
+ * @n: how many names to be created
+ */
+void create_2(int n)
+{
+    int i, j;
+
+    name[2] = '\0';
+    for (i = 0; i < NCHARS; i++) {
+        name[0] = chars[i];
+        for (j = 0; j < NCHARS; j++) {
+            name[1] = chars[j];
+            create_dir();
+            if (--n == 0)
+                return;
+        }
+    }
+}
+
+/*
+ * create_3 - generate length-3 directory names
+ * @n: how many names to be created
+ */
+void create_3(int n)
+{
+    int i, j, k;
+
+    name[3] = '\0';
+    for (i = 0; i < NCHARS; i++) {
+        name[0] = chars[i];
+        for (j = 0; j < NCHARS; j++) {
+            name[1] = chars[j];
+            for (k = 0; k < NCHARS; k++) {
+                name[2] = chars[k];
+                create_dir();
+                if (--n == 0)
+                    return;
+            }
+        }
+    }
+}
+
+void usage()
+{
+    fprintf(stderr, "Usage: create_short_dirs nr_dirs parent_dir\n");
+}
+
+/*
+ * Create short-name directoriess
+ * @argv[1]: director number
+ * @argv[2]: the parent directory
+ */
+int main(int argc, char *argv[])
+{
+    if (argc != 3) {
+        usage();
+        return 1;
+    }
+
+    names = atoi(argv[1]);
+    if (names > MAX_NAMES || names <= 0) {
+        usage();
+        return 1;
+    }
+
+    parent_fd = open(argv[2], O_RDONLY);
+    if (parent_fd == -1) {
+        perror("open parent dir");
+        return 1;
+    }
+
+    create_1(names);
+    if (names <= MAX_LEN1)
+        return 0;
+
+    names -= MAX_LEN1;
+    create_2(names);
+    if (names <= MAX_LEN2)
+        return 0;
+
+    names -= MAX_LEN2;
+    create_3(names);
+
+    return 0;
+}
diff --git a/src/t_ext4_file_time.c b/src/t_ext4_file_time.c
new file mode 100644
index 00000000..eac55c75
--- /dev/null
+++ b/src/t_ext4_file_time.c
@@ -0,0 +1,50 @@ 
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+
+/*
+ * Usage: file_time <filename> <atime|mtime|ctime> <sec|nsec>
+ */
+int main(int argc, char *argv[])
+{
+    time_t t;
+    struct stat st;
+
+    if (argc != 4) {
+        fprintf(stderr, "Wrong argument num!\n");
+        return 1;
+    }
+
+    if (stat(argv[1], &st) != 0) {
+        perror("stat failed");
+        return 1;
+    }
+
+    if (strcmp(argv[3], "sec") == 0) {
+        if (strcmp(argv[2], "atime") == 0)
+            t = st.st_atime;
+        else if (strcmp(argv[2], "mtime") == 0)
+            t = st.st_mtime;
+        else
+            t = st.st_ctime;
+    } else if (strcmp(argv[3], "nsec") == 0) {
+        if (strcmp(argv[2], "atime") == 0)
+            t = st.st_atim.tv_nsec;
+        else if (strcmp(argv[2], "mtime") == 0)
+            t = st.st_mtim.tv_nsec;
+        else
+            t = st.st_ctim.tv_nsec;
+    } else {
+        fprintf(stderr, "Wrong argument: %s\n", argv[3]);
+        return 1;
+    }
+
+    printf("%lu\n", t);
+
+    return 0;
+}
diff --git a/tests/ext4/043 b/tests/ext4/043
new file mode 100755
index 00000000..b6e5df9f
--- /dev/null
+++ b/tests/ext4/043
@@ -0,0 +1,64 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2019 SUSE Linux Products GmbH.  All Rights Reserved.
+#
+# FS QA Test No. 043
+#
+# Transfer from ltp/testcases/kernel/fs/ext4-new-features/ext4_nsec_timestamps
+# Test file timestamps is second with 128 inode size
+#
+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.*
+    _scratch_cleanup_files
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs ext3 ext4
+_supported_os Linux
+
+_require_scratch
+_require_test_program "t_ext4_file_time"
+_require_command "$TUNE2FS_PROG" tune2fs
+
+echo "Silence is golden"
+
+echo "Start test timestamps with 128 inode size one device
$SCRATCH_DEV" >$seqres.full
+_scratch_mkfs_ext4 -I 128 >> $seqres.full 2>&1
+tune2fs -O extents $SCRATCH_DEV >>$seqres.full 2>&1
+_scratch_mount
+
+touch "${SCRATCH_MNT}/tmp_file"
+
+atime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file atime nsec`
+mtime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file mtime nsec`
+ctime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file ctime nsec`
+
+if [ $atime -ne 0 -o $mtime -ne 0 -o $ctime -ne 0 ]; then
+        echo "Timestamp is not second(atime: $atime, mtime: $mtime,
ctime: $ctime)" >> $seqres.full
+        _scratch_unmount >> $seqres.full 2>&1
+        exit
+fi
+echo "Ext4 nanosecond timestamps test with 128 inode size pass" >> $seqres.full
+_scratch_unmount >> $seqres.full 2>&1
+
+# no BUG_ON, all done
+status=0
+exit
diff --git a/tests/ext4/043.out b/tests/ext4/043.out
new file mode 100644
index 00000000..f90f0a57
--- /dev/null
+++ b/tests/ext4/043.out
@@ -0,0 +1,2 @@ 
+QA output created by 043
+Silence is golden
diff --git a/tests/ext4/044 b/tests/ext4/044
new file mode 100755
index 00000000..3e899f5a
--- /dev/null
+++ b/tests/ext4/044
@@ -0,0 +1,112 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2019 SUSE Linux Products GmbH.  All Rights Reserved.
+#
+# FS QA Test No. 044
+#
+# Transfer from ltp/testcases/kernel/fs/ext4-new-features/ext4_nsec_timestamps
+# Test file timestamps is nanosecond with 256 inode size
+#
+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.*
+    _scratch_cleanup_files
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs ext3 ext4
+_supported_os Linux
+_require_scratch
+_require_test_program "t_ext4_file_time"
+
+echo "Silence is golden"
+
+echo "Test timestamps with 256 inode size one device $SCRATCH_DEV"
>$seqres.full
+_scratch_mkfs_ext4 -t ext3 -I 256 >> $seqres.full 2>&1
+_scratch_mount
+
+# Create file
+touch "${SCRATCH_MNT}/tmp_file"
+sleep 1
+
+# Change atime, ctime and mtime of the file
+touch "${SCRATCH_MNT}/tmp_file"
+
+cur_time=`date '+%s %N'`
+sec=`echo $cur_time | awk {'print $1'}`
+nsec=`echo $cur_time | awk {'print $2'}`
+
+sec_atime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file atime sec`
+sec_mtime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file mtime sec`
+sec_ctime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file ctime sec`
+nsec_atime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file atime nsec`
+nsec_mtime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file mtime nsec`
+nsec_ctime=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file ctime nsec`
+
+# Test nanosecond
+if [ $nsec_atime -eq 0 -a $nsec_mtime -eq 0 -a $nsec_ctime -eq 0 ]; then
+        echo "The timestamp is not nanosecond(nsec_atime: $nsec_atime, \
+              nsec_mtime: $nsec_mtime, nsec_ctime: $nsec_ctime)" >>
$seqres.full
+        _scratch_unmount >> $seqres.full 2>&1
+        exit
+fi
+
+diff1=$(( $sec_atime - $sec ))
+diff2=$(( $sec_mtime - $sec ))
+diff3=$(( $sec_ctime - $sec ))
+
+# Test difference between file time and current time
+if [ $diff1 -gt 1 -o $diff2 -gt 1 -o $diff2 -gt 1 ]; then
+        echo "The timestamp is wrong, it must be earlier than the
current time we got. \
+             (sec_atime: $sec_atime, sec_mtime: $sec_mtime,
sec_ctime: $sec_ctime, \
+             cur_time[s]: $sec)" >> $seqres.full
+        _scratch_unmount >> $seqres.full 2>&1
+        exit
+fi
+_scratch_unmount >> $seqres.full 2>&1
+
+# Test mount to ext3 and then mount back to ext4
+mount -t ext3 $SCRATCH_DEV $SCRATCH_MNT
+if [ $? -ne 0 ]; then
+        echo "$SCRATCH_DEV fail in mounting to ext3" >> $seqres.full
+        _scratch_unmount >> $seqres.full 2>&1
+        exit
+fi
+_scratch_unmount >> $seqres.full 2>&1
+_scratch_mount
+
+nsec_atime2=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file atime nsec`
+nsec_mtime2=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file mtime nsec`
+nsec_ctime2=`$here/src/t_ext4_file_time $SCRATCH_MNT/tmp_file ctime nsec`
+
+if [ $nsec_atime -ne $nsec_atime2 -o $nsec_ctime -ne $nsec_ctime2 -o \
+     $nsec_mtime -ne $nsec_mtime2 ]; then
+        echo "File nanosecond timestamp has changed \
+                        unexpected. Before[atime mtime ctime]: $nsec_atime \
+                        nsec_mtime $nsec_ctime, After[atime mtime ctime]: \
+                        $nsec_atime2 $nsec_mtime2 $nsec_ctime2)" >>
$seqres.full
+        _scratch_unmount >> $seqres.full 2>&1
+        exit
+fi
+_scratch_unmount >> $seqres.full 2>&1
+
+# no BUG_ON, all done
+status=0
+exit
diff --git a/tests/ext4/044.out b/tests/ext4/044.out
new file mode 100644
index 00000000..12a61dc4
--- /dev/null
+++ b/tests/ext4/044.out
@@ -0,0 +1,2 @@ 
+QA output created by 044
+Silence is golden
diff --git a/tests/ext4/045 b/tests/ext4/045
new file mode 100755
index 00000000..c70baa97
--- /dev/null
+++ b/tests/ext4/045
@@ -0,0 +1,148 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2019 SUSE Linux Products GmbH.  All Rights Reserved.
+#
+# FS QA Test No. 045
+#
+# Transfer from
ltp/testcases/kernel/fs/ext4-new-features/ext4_subdir_limit_test
+#
+# Test subdirectory limit of ext4.
+# We create more than 32000 subdirectorys on the ext4 filesystem.
+#
+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
+
+SHORT_DIR=1
+LONG_DIR=2
+FAIL=1
+PASS=0
+prev_block_size=0
+prev_result=$FAIL
+
+_cleanup()
+{
+    cd /
+    rm -f $tmp.*
+    _scratch_cleanup_files
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs ext4
+_supported_os Linux
+
+_require_scratch
+_require_test_program "t_create_short_dirs"
+_require_test_program "t_create_long_dirs"
+_require_command "$TUNE2FS_PROG" tune2fs
+_require_command "$E2FSCK_PROG" e2fsck
+_require_dumpe2fs
+
+echo "Silence is golden"
+
+# Run a test case
+# $1: Number of directories to create
+# $2: create short dir or long dir
+# $3: parent directory
+# $4: filesystem block size
+_workout()
+{
+    local dir_name_len=
+    if [ $2 -eq $SHORT_DIR ]; then
+        dir_name_len="short name"
+    else
+        dir_name_len="long name"
+    fi
+
+    echo "Num of dirs to create: $1, Dir name len: $dir_name_len, " \
+          "Parent dir: $3, Block size: $4" >> $seqres.full 2>&1
+
+    # Only mkfs if block size has been changed, or previous case failed
+    if [ $prev_result -ne $PASS -o $4 -ne $prev_block_size ]; then
+        $MKFS_EXT4_PROG -F -b $4 -I 256 $SCRATCH_DEV >> $seqres.full 2>&1
+        prev_block_size=$4
+        tune2fs -O extents $SCRATCH_DEV >> $seqres.full 2>&1
+    fi
+    prev_result=$FAIL
+
+    _scratch_mount
+
+    # create directories
+    mkdir -p $3 2> /dev/null
+
+    if [ $2 -eq $SHORT_DIR ]; then
+        $here/src/t_create_short_dirs $1 $3
+    else
+        $here/src/t_create_long_dirs $1 $3
+    fi
+
+    if [ $? -ne 0 ]; then
+        nr_dirs=`ls $3 | wc -l`
+        echo "Failed to create directories - $nr_dirs"
+        _scratch_unmount
+        return
+    fi
+
+    # delete directories
+    cd $3
+    ls | xargs rmdir
+    if [ $? -ne 0 ]; then
+        echo "Failed to remove directories in $3"
+        cd - > /dev/null
+        _scratch_unmount
+        return
+    fi
+    cd - > /dev/null
+    _scratch_unmount
+
+    # check dir_nlink is set
+    dumpe2fs $SCRATCH_DEV 2> /dev/null | grep '^Filesystem features'
| grep -q dir_nlink
+    if [ $? -ne 0 ]; then
+        echo "Feature dir_nlink is not set, please check $seqres.full
for detail"
+        return
+    fi
+
+    # run fsck to make sure the filesystem has no errors
+    $E2FSCK_PROG -fy $SCRATCH_DEV >> $seqres.full 2>&1
+    if [ $? -ne 0 ]; then
+        echo "fsck: the filesystem has errors, please check
$seqres.full for detail"
+        return
+    fi
+
+    prev_result=$PASS
+}
+
+# main
+DIR_LEN=( $SHORT_DIR $LONG_DIR )
+PARENT_DIR=( "$SCRATCH_MNT" "$SCRATCH_MNT/sub" )
+BLOCK_SIZE=( 1024 2048 4096 )
+
+for ((i = 0; i < 3; i++)); do
+    for ((j = 0; j < 2; j++)); do
+        for ((k = 0; k < 2; k++)); do
+            if [ ${DIR_LEN[$k]} -eq $LONG_DIR -a \
+                    ${BLOCK_SIZE[$i]} -eq 1024 ]; then
+                continue
+            fi
+            _workout 65537 ${DIR_LEN[$k]} ${PARENT_DIR[$j]} ${BLOCK_SIZE[$i]}
+        done
+    done
+done
+
+_scratch_unmount >> $seqres.full 2>&1
+
+# no BUG_ON, all done
+status=0
+exit
diff --git a/tests/ext4/045.out b/tests/ext4/045.out
new file mode 100644
index 00000000..66276cfa
--- /dev/null
+++ b/tests/ext4/045.out
@@ -0,0 +1,2 @@ 
+QA output created by 045
+Silence is golden
diff --git a/tests/ext4/group b/tests/ext4/group
index 9dfc0d35..8419cdea 100644
--- a/tests/ext4/group
+++ b/tests/ext4/group
@@ -45,6 +45,9 @@ 
 040 dangerous_fuzzers
 041 dangerous_fuzzers
 042 auto quick
+043 auto quick
+044 auto quick
+045 auto
 271 auto rw quick
 301 aio auto ioctl rw stress defrag
 302 aio auto ioctl rw stress defrag