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Subject[PATCH] fsstress: support direct IO
Date
From: huangjianan <huangjianan@oppo.com>

add direct IO test for the stress tool which was mentioned here:
https://lore.kernel.org/linux-erofs/20200206135631.1491-1-hsiangkao@aol.com/

Signed-off-by: Huang Jianan <huangjianan@oppo.com>
Signed-off-by: Guo Weichao <guoweichao@oppo.com>
---
stress.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/stress.c b/stress.c
index f4bf874..7e7cc93 100644
--- a/stress.c
+++ b/stress.c
@@ -4,12 +4,14 @@
*
* Copyright (C) 2019-2020 Gao Xiang <hsiangkao@aol.com>
*/
+#define _GNU_SOURCE
#define _LARGEFILE64_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
+#include <stdbool.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
@@ -21,6 +23,7 @@
#define MAX_CHUNKSIZE (4 * 1024 * 1024)
#define MAX_SCAN_CHUNKSIZE (256 * 1024)

+bool direct_io = false;
unsigned int nprocs = 512;
sig_atomic_t should_stop = 0;

@@ -98,7 +101,7 @@ int drop_file_cache(int fd, int mode)

int tryopen(char *filename)
{
- int fd = open(filename, O_RDONLY);
+ int fd = open(filename, direct_io ? O_RDONLY : O_RDONLY | O_DIRECT);

if (fd < 0)
return -errno;
@@ -166,6 +169,13 @@ int randread(int fd, int chkfd, uint64_t filesize)
if (start + length > filesize)
length = filesize - start;

+ if (direct_io) {
+ length = (((length - 1) >> PAGE_SHIFT) + 1)
+ << PAGE_SHIFT;
+ if (!length || start + length > filesize)
+ return 0;
+ }
+
printf("randread(%u): %llu bytes @ %llu\n",
getpid(), (unsigned long long)length,
(unsigned long long)start);
@@ -212,7 +222,7 @@ int testfd(int fd, int chkfd, int mode)
err = doscan(fd, chkfd, filesize, chunksize);
if (err)
return err;
- } else if (mode == RANDSCAN_UNALIGNED) {
+ } else if (mode == RANDSCAN_UNALIGNED && !direct_io) {
chunksize = (random() * random() % MAX_SCAN_CHUNKSIZE) + 1;
err = doscan(fd, chkfd, filesize, chunksize);
if (err)
@@ -252,8 +262,11 @@ static int parse_options(int argc, char *argv[])
{
int opt;

- while ((opt = getopt(argc, argv, "p:")) != -1) {
+ while ((opt = getopt(argc, argv, "dp:")) != -1) {
switch (opt) {
+ case 'd':
+ direct_io = true;
+ break;
case 'p':
nprocs = atoi(optarg);
if (nprocs < 0) {
@@ -281,6 +294,7 @@ void usage(void)
{
fputs("usage: [options] TESTFILE [COMPRFILE]\n\n"
"stress tester for read-only filesystems\n"
+ " -d use direct io\n"
" -p# set workers to #\n", stderr);
}

--
2.7.4
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