[LTP] [PATCH v2] syscalls: add syscall syncfs test

[Sumit Garg]

On Fri, 15 Feb 2019 at 13:25, Xiao Yang <yangx.jy@cn.fujitsu.com> wrote:
>
> Hi Sumit,
>
> Sorry for the late reply. :-)

No worries. :)

>
> 1) Compilation failed on older kernel(e.g. v2.6.32) because of the
> undefined syncfs().
> According to manpage, syncfs() was first appeared in Linux 2.6.39 and
> library
> support was added to glibc in version 2.14. Perhaps, we need to check if
> syncfs()
> is defined.
>

Would configuring .min_kver suffice to avoid this compilation issue?

> 2) Running this test got TBROK on older kernel(e.g. v3.10.0), as below:
> -------------------------------------------------------------------
> syncfs01.c:63: FAIL: Failed to sync test filesystem to device
> -------------------------------------------------------------------
> It seems that the content of /sys/block/<loopX>/stat is always zero and
> doesn't update even though write and sync have been done. I am looking
> into it, but i am not sure if this is a known bug on older kernel.
>

Thanks for looking into this. I will investigate this also.

-Sumit

> Best Regards,
> Xiao Yang
> On 2019/02/15 15:17, Sumit Garg wrote:
> > syncfs01 tests to sync filesystem having large dirty file pages to block
> > device. Also, it tests all supported filesystems on a test block device.
> >
> > Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> > ---
> >
> > Changes in v2:
> > 1. Remove unused header file include.
> > 2. Remove redundant tst_device check.
> > 3. Remove redundant flags from tst_test struct.
> >
> > Fixes: https://github.com/linux-test-project/ltp/issues/294
> >
> >  runtest/syscalls                            |   2 +
> >  testcases/kernel/syscalls/syncfs/.gitignore |   1 +
> >  testcases/kernel/syscalls/syncfs/Makefile   |   8 +++
> >  testcases/kernel/syscalls/syncfs/syncfs01.c | 101 ++++++++++++++++++++++++++++
> >  4 files changed, 112 insertions(+)
> >  create mode 100644 testcases/kernel/syscalls/syncfs/.gitignore
> >  create mode 100644 testcases/kernel/syscalls/syncfs/Makefile
> >  create mode 100644 testcases/kernel/syscalls/syncfs/syncfs01.c
> >
> > diff --git a/runtest/syscalls b/runtest/syscalls
> > index 668c87c..9442740 100644
> > --- a/runtest/syscalls
> > +++ b/runtest/syscalls
> > @@ -1346,6 +1346,8 @@ symlinkat01 symlinkat01
> >  sync01 sync01
> >  sync02 sync02
> >
> > +syncfs01 syncfs01
> > +
> >  #testcases for sync_file_range
> >  sync_file_range01 sync_file_range01
> >
> > diff --git a/testcases/kernel/syscalls/syncfs/.gitignore b/testcases/kernel/syscalls/syncfs/.gitignore
> > new file mode 100644
> > index 0000000..6066295
> > --- /dev/null
> > +++ b/testcases/kernel/syscalls/syncfs/.gitignore
> > @@ -0,0 +1 @@
> > +syncfs01
> > diff --git a/testcases/kernel/syscalls/syncfs/Makefile b/testcases/kernel/syscalls/syncfs/Makefile
> > new file mode 100644
> > index 0000000..3e6c2f4
> > --- /dev/null
> > +++ b/testcases/kernel/syscalls/syncfs/Makefile
> > @@ -0,0 +1,8 @@
> > +# Copyright (c) 2019 - Linaro Limited. All rights reserved.
> > +# SPDX-License-Identifier: GPL-2.0-or-later
> > +
> > +top_srcdir             ?= ../../../..
> > +
> > +include $(top_srcdir)/include/mk/testcases.mk
> > +
> > +include $(top_srcdir)/include/mk/generic_leaf_target.mk
> > diff --git a/testcases/kernel/syscalls/syncfs/syncfs01.c b/testcases/kernel/syscalls/syncfs/syncfs01.c
> > new file mode 100644
> > index 0000000..e2d3e80
> > --- /dev/null
> > +++ b/testcases/kernel/syscalls/syncfs/syncfs01.c
> > @@ -0,0 +1,101 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (c) 2019 Linaro Limited. All rights reserved.
> > + * Author: Sumit Garg <sumit.garg@linaro.org>
> > + */
> > +
> > +/*
> > + * Test syncfs
> > + *
> > + * It basically tests syncfs() to sync filesystem having large dirty file
> > + * pages to block device. Also, it tests all supported filesystems on a test
> > + * block device.
> > + */
> > +
> > +#define _GNU_SOURCE
> > +#include <stdlib.h>
> > +#include <stdio.h>
> > +#include <sys/types.h>
> > +#include "tst_test.h"
> > +#include "lapi/fs.h"
> > +#include "lapi/stat.h"
> > +
> > +#define MNTPOINT             "mnt_point"
> > +#define TST_FILE             MNTPOINT"/test"
> > +#define TST_FILE_SIZE_MB     32
> > +#define SIZE_MB                      (1024*1024)
> > +#define MODE                 0644
> > +
> > +static char dev_stat_path[1024];
> > +static char *buffer;
> > +static int fd;
> > +
> > +static void verify_syncfs(void)
> > +{
> > +     char nwrite_sec_val[BUFSIZ];
> > +     int counter;
> > +     unsigned long prev_write_sec = 0, write_sec = 0;
> > +
> > +     SAFE_FILE_SCANF(dev_stat_path, "%*s %*s %*s %*s %*s %*s %s",
> > +                     nwrite_sec_val);
> > +
> > +     prev_write_sec = SAFE_STRTOUL(nwrite_sec_val, 0, ULONG_MAX);
> > +
> > +     fd =  SAFE_OPEN(TST_FILE, O_RDWR|O_CREAT, MODE);
> > +
> > +     /* Filling the test file */
> > +     for (counter = 0; counter < TST_FILE_SIZE_MB; counter++)
> > +             SAFE_WRITE(1, fd, buffer, SIZE_MB);
> > +
> > +     TEST(syncfs(fd));
> > +     if (TST_RET != 0)
> > +             tst_brk(TFAIL | TTERRNO, "syncfs(fd) failed");
> > +
> > +     SAFE_FILE_SCANF(dev_stat_path, "%*s %*s %*s %*s %*s %*s %s",
> > +                     nwrite_sec_val);
> > +
> > +     write_sec = SAFE_STRTOUL(nwrite_sec_val, 0, ULONG_MAX);
> > +
> > +     if ((write_sec - prev_write_sec) * 512 >=
> > +         (TST_FILE_SIZE_MB * SIZE_MB))
> > +             tst_res(TPASS, "Test filesystem synced to device");
> > +     else
> > +             tst_res(TFAIL, "Failed to sync test filesystem to device");
> > +
> > +     SAFE_CLOSE(fd);
> > +}
> > +
> > +static void setup(void)
> > +{
> > +     struct stat st;
> > +
> > +     snprintf(dev_stat_path, sizeof(dev_stat_path), "/sys/block/%s/stat",
> > +              strrchr(tst_device->dev, '/') + 1);
> > +
> > +     if (stat(dev_stat_path, &st) != 0)
> > +             tst_brk(TCONF, "Test device stat file: %s not found",
> > +                     dev_stat_path);
> > +
> > +     buffer = SAFE_MALLOC(SIZE_MB);
> > +
> > +     memset(buffer, 0, SIZE_MB);
> > +}
> > +
> > +static void cleanup(void)
> > +{
> > +     if (buffer)
> > +             free(buffer);
> > +
> > +     if (fd > 0)
> > +             SAFE_CLOSE(fd);
> > +}
> > +
> > +static struct tst_test test = {
> > +     .needs_root = 1,
> > +     .mount_device = 1,
> > +     .all_filesystems = 1,
> > +     .mntpoint = MNTPOINT,
> > +     .setup = setup,
> > +     .cleanup = cleanup,
> > +     .test_all = verify_syncfs,
> > +};
>
>
>