[LTP] [PATCH v3 6/7] syscalls/sync_file_range: Use C library wrapper if present

[Cyril Hrubis <chrubis@suse.cz>]

Hi!
> diff --git a/configure.ac b/configure.ac
> index 9122b6d..d15bff3 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -232,6 +232,7 @@ LTP_CHECK_RLIMIT64
>  LTP_DETECT_HOST_CPU
>  LTP_CHECK_PERF_EVENT
>  LTP_CHECK_SYNCFS
> +LTP_CHECK_SYNC_FILE_RANGE
>  
>  if test "x$with_numa" = xyes; then
>  	LTP_CHECK_SYSCALL_NUMA
> diff --git a/include/lapi/sync_file_range.h b/include/lapi/sync_file_range.h
> new file mode 100644
> index 0000000..7b0ef69
> --- /dev/null
> +++ b/include/lapi/sync_file_range.h
> @@ -0,0 +1,64 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) International Business Machines  Corp., 2008
> + */
> +
> +#ifndef SYNC_FILE_RANGE_H
> +#define SYNC_FILE_RANGE_H
> +
> +#include <sys/types.h>
> +#include "config.h"
> +#include "lapi/syscalls.h"
> +
> +#if !defined(HAVE_SYNC_FILE_RANGE)
> +
> +#ifdef TST_TEST_H__
> +# define TST_SYSCALL tst_syscall
> +#else
> +# define TST_SYSCALL ltp_syscall
> +#endif
> +
> +/*****************************************************************************
> + * Wraper function to call sync_file_range system call
> + ******************************************************************************/
> +static inline long sync_file_range(int fd, off64_t offset, off64_t nbytes,
> +				   unsigned int flags)
> +{
> +/* arm and powerpc */
> +#if (defined(__arm__) || defined(__powerpc__) || defined(__powerpc64__))
> +#if (__WORDSIZE == 32)
> +#if __BYTE_ORDER == __BIG_ENDIAN
> +	return TST_SYSCALL(__NR_sync_file_range2, fd, flags,
> +		(int)(offset >> 32), (int)offset, (int)(nbytes >> 32),
> +		(int)nbytes);
> +#elif __BYTE_ORDER == __LITTLE_ENDIAN
> +	return TST_SYSCALL(__NR_sync_file_range2, fd, flags, (int)offset,
> +		       (int)(offset >> 32), nbytes, (int)(nbytes >> 32));
> +#endif
> +#else
> +	return TST_SYSCALL(__NR_sync_file_range2, fd, flags, offset, nbytes);
> +#endif
> +
> +/* s390 */

Instead of comment like this the usuall way how to make this maze easier
to read is to stick spaces after the hash to inner conditions, so this
would become:

#if (defined(__arm__) || defined (__powerpc__) || defined(__powerpc64__))
# if (__WORDSIZE == 32)
#  if __BYTE_ORDER == __BIG_ENDIAN
	return ...;
#  elif __BYTE_ORDER == __LITTLE_ENDIAN
	return ...;
#  endif
# else
	return ...;
#endif


> +#elif (defined(__s390__) || defined(__s390x__)) && __WORDSIZE == 32
> +	return TST_SYSCALL(__NR_sync_file_range, fd, (int)(offset >> 32),
> +		(int)offset, (int)(nbytes >> 32), (int)nbytes, flags);
> +
> +/* mips */
> +#elif defined(__mips__) && __WORDSIZE == 32
> +#if __BYTE_ORDER == __BIG_ENDIAN
> +	return TST_SYSCALL(__NR_sync_file_range, fd, 0, (int)(offset >> 32),
> +		(int)offset, (int)(nbytes >> 32), (int)nbytes, flags);
> +#elif __BYTE_ORDER == __LITTLE_ENDIAN
> +	return TST_SYSCALL(__NR_sync_file_range, fd, 0, (int)offset,
> +		(int)(offset >> 32), (int)nbytes, (int)(nbytes >> 32), flags);
> +#endif
> +
> +/* other */
> +#else
> +	return TST_SYSCALL(__NR_sync_file_range, fd, offset, nbytes, flags);
> +#endif
> +}
> +#endif



> +#endif /* SYNC_FILE_RANGE_H */
> diff --git a/m4/ltp-sync_file_range.m4 b/m4/ltp-sync_file_range.m4
> new file mode 100644
> index 0000000..b47a091
> --- /dev/null
> +++ b/m4/ltp-sync_file_range.m4
> @@ -0,0 +1,10 @@
> +dnl SPDX-License-Identifier: GPL-2.0-or-later
> +dnl Copyright (c) 2019 Linaro Limited. All rights reserved.
> +
> +dnl
> +dnl LTP_CHECK_SYNC_FILE_RANGE
> +dnl ----------------------------
> +dnl
> +AC_DEFUN([LTP_CHECK_SYNC_FILE_RANGE],[
> +AC_CHECK_FUNCS(sync_file_range,,)
> +])
> diff --git a/testcases/kernel/syscalls/sync_file_range/check_sync_file_range.h b/testcases/kernel/syscalls/sync_file_range/check_sync_file_range.h
> new file mode 100644
> index 0000000..3d932f6
> --- /dev/null
> +++ b/testcases/kernel/syscalls/sync_file_range/check_sync_file_range.h
> @@ -0,0 +1,23 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2019 Linaro Limited. All rights reserved.
> + * Author: Sumit Garg <sumit.garg@linaro.org>
> + */
> +
> +#ifndef CHECK_SYNC_FILE_RANGE_H
> +#define CHECK_SYNC_FILE_RANGE_H
> +
> +#include <stdbool.h>
> +
> +bool check_sync_file_range(void)
> +{
> +	int ret;
> +
> +	ret = sync_file_range(-1, 0, 0, 0);
> +	if (ret == -1 && errno == EINVAL)
> +		return false;
> +
> +	return true;
> +}

I would rather stick to return 0 and return 1 instead of including the
stdbool, but that is very minor.

> +#endif /* CHECK_SYNC_FILE_RANGE_H */
> diff --git a/testcases/kernel/syscalls/sync_file_range/sync_file_range01.c b/testcases/kernel/syscalls/sync_file_range/sync_file_range01.c
> index cebb919..3a97183 100644
> --- a/testcases/kernel/syscalls/sync_file_range/sync_file_range01.c
> +++ b/testcases/kernel/syscalls/sync_file_range/sync_file_range01.c
> @@ -92,7 +92,8 @@
>  #include <unistd.h>
>  
>  #include "test.h"
> -#include "lapi/syscalls.h"
> +#include "lapi/sync_file_range.h"
> +#include "check_sync_file_range.h"
>  
>  #ifndef SYNC_FILE_RANGE_WAIT_BEFORE
>  #define SYNC_FILE_RANGE_WAIT_BEFORE 1
> @@ -190,48 +191,6 @@ void setup(void)
>  	sfd = open(spl_file, O_RDWR | O_CREAT, 0700);
>  }
>  
> -/*****************************************************************************
> - * Wraper function to call sync_file_range system call
> - ******************************************************************************/
> -static inline long syncfilerange(int fd, off64_t offset, off64_t nbytes,
> -				 unsigned int flags)
> -{
> -/* arm and powerpc */
> -#if (defined(__arm__) || defined(__powerpc__) || defined(__powerpc64__))
> -#if (__WORDSIZE == 32)
> -#if __BYTE_ORDER == __BIG_ENDIAN
> -	return ltp_syscall(__NR_sync_file_range2, fd, flags,
> -		(int)(offset >> 32), (int)offset, (int)(nbytes >> 32),
> -		(int)nbytes);
> -#elif __BYTE_ORDER == __LITTLE_ENDIAN
> -	return ltp_syscall(__NR_sync_file_range2, fd, flags, (int)offset,
> -		       (int)(offset >> 32), nbytes, (int)(nbytes >> 32));
> -#endif
> -#else
> -	return ltp_syscall(__NR_sync_file_range2, fd, flags, offset, nbytes);
> -#endif
> -
> -/* s390 */
> -#elif (defined(__s390__) || defined(__s390x__)) && __WORDSIZE == 32
> -	return ltp_syscall(__NR_sync_file_range, fd, (int)(offset >> 32),
> -		(int)offset, (int)(nbytes >> 32), (int)nbytes, flags);
> -
> -/* mips */
> -#elif defined(__mips__) && __WORDSIZE == 32
> -#if __BYTE_ORDER == __BIG_ENDIAN
> -	return ltp_syscall(__NR_sync_file_range, fd, 0, (int)(offset >> 32),
> -		(int)offset, (int)(nbytes >> 32), (int)nbytes, flags);
> -#elif __BYTE_ORDER == __LITTLE_ENDIAN
> -	return ltp_syscall(__NR_sync_file_range, fd, 0, (int)offset,
> -		(int)(offset >> 32), (int)nbytes, (int)(nbytes >> 32), flags);
> -#endif
> -
> -/* other */
> -#else
> -	return ltp_syscall(__NR_sync_file_range, fd, offset, nbytes, flags);
> -#endif
> -}
> -
>  /******************************************************************************/
>  /*									    */
>  /* Function:    main							  */
> @@ -258,24 +217,13 @@ int main(int ac, char **av)
>  
>  	tst_parse_opts(ac, av, NULL, NULL);
>  
> -#if defined(__powerpc__) || defined(__powerpc64__)	/* for PPC, kernel version > 2.6.21 needed */
> -	if (tst_kvercmp(2, 16, 22) < 0) {
> -		tst_brkm(TCONF, NULL,
> -			 "System doesn't support execution of the test");
> -	}
> -#else
> -	/* For other archs, need kernel version > 2.6.16 */
> -
> -	if (tst_kvercmp(2, 6, 17) < 0) {
> -		tst_brkm(TCONF, NULL,
> -			 "System doesn't support execution of the test");
> -	}
> -#endif
> +	if (!check_sync_file_range())
> +		tst_brkm(TCONF, NULL, "sync_file_range() not supported");
>  
>  	setup();
>  
>  	for (test_index = 0; test_index < TST_TOTAL; test_index++) {
> -		TEST(syncfilerange
> +		TEST(sync_file_range
>  		     (*(test_data[test_index].fd),
>  		      test_data[test_index].offset,
>  		      test_data[test_index].nbytes,

Other than the minor things, this is great work.

-- 
Cyril Hrubis
chrubis@suse.cz