tst_device: Move tst_dev_sync() into from header to source file

While socketcall01.c could (and should) be easily fixed by using
tst_syscall() instead of custom syscall support detection and
nothing else was broken by 9e83513, before release do more
conservative fix by moving tst_dev_sync() into library code.

This fixes regression in detecting socketcall() syscall support for
archs which does not support it (e.g.  x86_64, ARM):

    socketcall01.c:42: FAIL: socketcall() for TCP stream failed with -1: ENOSYS (38)
    socketcall01.c:42: FAIL: socketcall() for unix domain dgram failed with -1: ENOSYS (38)
    socketcall01.c:42: FAIL: socketcall() for Raw socket failed with -1: ENOSYS (38)
    socketcall01.c:42: FAIL: socketcall() for UDP dgram failed with -1: ENOSYS (38)

Fixes: 9e83513 "tst_device.h: Use lapi/syscalls.h instead of <sys/syscall.h>"
Fixes: #634

Suggested-by: Martin Doucha <[email protected]>
Acked-by: Cyril Hrubis <[email protected]>
Signed-off-by: Petr Vorel <[email protected]>

Author: pevik

include/tst_device.h

@@ -19,7 +19,6 @@
 #define TST_DEVICE_H__
 
 #include <unistd.h>
-#include "lapi/syscalls.h"
 
 struct tst_device {
 	const char *dev;
@@ -76,10 +75,7 @@ int tst_detach_device(const char *dev_path);
  * simply before the tst_dev_bytes_written invocation. For easy to use,
  * we create this inline function tst_dev_sync.
  */
-static inline int tst_dev_sync(int fd)
-{
-	return syscall(__NR_syncfs, fd);
-}
+int tst_dev_sync(int fd);
 
 /*
  * Reads test block device stat file and returns the bytes written since the

lib/tst_device.c

@@ -31,6 +31,7 @@
 #include <linux/loop.h>
 #include <stdint.h>
 #include <inttypes.h>
+#include "lapi/syscalls.h"
 #include "test.h"
 #include "safe_macros.h"
 
@@ -222,6 +223,11 @@ int tst_detach_device(const char *dev)
 	return 1;
 }
 
+int tst_dev_sync(int fd)
+{
+	return syscall(__NR_syncfs, fd);
+}
+
 const char *tst_acquire_device__(unsigned int size)
 {
 	int fd;