syscalls/copy_file_range02: skip if cross-fs isn't supported

copy_file_range02 was written to verify copy_file_range() v5.3 changes.
Detect it via cross-filesystem copy_file_range() functionality, so that we
cover also backports to stable/enterprise distro kernels (if backported,
it should be with all those API fixes).

Missing these API fixes is detected by errno changes introduced by
This fixes errors caused by commits from v5.3-rc1:
5dae222a5ff0 ("vfs: allow copy_file_range to copy across devices")
96e6e8f4a68d ("vfs: add missing checks to copy_file_range")

This check requires to put back into copy_file_range02 .mount_device = 1
and .mntpoint = MNTPOINT (but .all_filesystems = 1 is obviously not needed).

+ Remove few unused imports.

Suggested-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

Author: pevik

testcases/kernel/syscalls/copy_file_range/copy_file_range.h

@@ -7,9 +7,7 @@
 #ifndef __COPY_FILE_RANGE_H__
 #define __COPY_FILE_RANGE_H__
 
-#include <stdbool.h>
-#include <unistd.h>
-#include <sys/sysmacros.h>
+#include <stdio.h>
 #include "lapi/syscalls.h"
 #include "lapi/fs.h"
 
@@ -62,4 +60,23 @@ static int sys_copy_file_range(int fd_in, loff_t *off_in,
 	return -1;
 }
 
+static inline int verify_cross_fs_copy_support(const char *path_in, const char *path_out)
+{
+	int i, fd, fd_test;
+
+	fd = SAFE_OPEN(path_in, O_RDWR | O_CREAT, 0664);
+	/* Writing page_size * 4 of data into test file */
+	for (i = 0; i < (int)(getpagesize() * 4); i++)
+		SAFE_WRITE(1, fd, CONTENT, CONTSIZE);
+
+	fd_test = SAFE_OPEN(path_out, O_RDWR | O_CREAT, 0664);
+	TEST(sys_copy_file_range(fd, 0, fd_test, 0, CONTSIZE, 0));
+
+	SAFE_CLOSE(fd_test);
+	remove(FILE_MNTED_PATH);
+	SAFE_CLOSE(fd);
+
+	return TST_ERR == EXDEV ? 0 : 1;
+}
+
 #endif /* __COPY_FILE_RANGE_H__ */

testcases/kernel/syscalls/copy_file_range/copy_file_range01.c

@@ -16,8 +16,6 @@
 
 #define _GNU_SOURCE
 
-#include <stdio.h>
-#include <stdlib.h>
 #include "tst_test.h"
 #include "tst_safe_stdio.h"
 #include "copy_file_range.h"
@@ -179,7 +177,7 @@ static void copy_file_range_verify(unsigned int n)
 
 	if (tc->flags && !cross_sup) {
 		tst_res(TCONF,
-			"copy_file_range doesn't support cross-device, skip it");
+			"copy_file_range() doesn't support cross-device, skip it");
 		return;
 	}
 
@@ -215,25 +213,9 @@ static void copy_file_range_verify(unsigned int n)
 
 static void setup(void)
 {
-	int i, fd, fd_test;
-
 	syscall_info();
-
 	page_size = getpagesize();
-	cross_sup = 1;
-	fd = SAFE_OPEN(FILE_SRC_PATH, O_RDWR | O_CREAT, 0664);
-	/* Writing page_size * 4 of data into test file */
-	for (i = 0; i < (int)(page_size * 4); i++)
-		SAFE_WRITE(1, fd, CONTENT, CONTSIZE);
-
-	fd_test = SAFE_OPEN(FILE_MNTED_PATH, O_RDWR | O_CREAT, 0664);
-	TEST(sys_copy_file_range(fd, 0, fd_test, 0, CONTSIZE, 0));
-	if (TST_ERR == EXDEV)
-		cross_sup = 0;
-
-	SAFE_CLOSE(fd_test);
-	remove(FILE_MNTED_PATH);
-	SAFE_CLOSE(fd);
+	cross_sup = verify_cross_fs_copy_support(FILE_SRC_PATH, FILE_MNTED_PATH);
 }
 
 static void cleanup(void)

testcases/kernel/syscalls/copy_file_range/copy_file_range02.c

@@ -49,6 +49,7 @@ static int fd_blkdev;
 static int fd_chrdev;
 static int fd_fifo;
 static int fd_copy;
+static int need_unlink;
 
 static int chattr_i_nsup;
 static int swap_nsup;
@@ -160,14 +161,19 @@ static void cleanup(void)
 		SAFE_CLOSE(fd_dup);
 	if (fd_copy > 0)
 		SAFE_CLOSE(fd_copy);
-	SAFE_UNLINK(FILE_FIFO);
+	if (need_unlink > 0)
+		SAFE_UNLINK(FILE_FIFO);
 }
 
 static void setup(void)
 {
 	syscall_info();
 	char dev_path[1024];
 
+	if (!verify_cross_fs_copy_support(FILE_SRC_PATH, FILE_MNTED_PATH))
+		tst_brk(TCONF,
+			"copy_file_range() doesn't support cross-device, skip it");
+
 	if (access(FILE_DIR_PATH, F_OK) == -1)
 		SAFE_MKDIR(FILE_DIR_PATH, 0777);
 	/*
@@ -177,6 +183,7 @@ static void setup(void)
 	loop_devn = tst_find_free_loopdev(dev_path, sizeof(dev_path));
 
 	SAFE_MKNOD(FILE_FIFO, S_IFIFO | 0777, 0);
+	need_unlink = 1;
 
 	fd_src    = SAFE_OPEN(FILE_SRC_PATH, O_RDWR | O_CREAT, 0664);
 	fd_dest   = SAFE_OPEN(FILE_DEST_PATH, O_RDWR | O_CREAT, 0664);
@@ -223,6 +230,8 @@ static struct tst_test test = {
 	.tcnt = ARRAY_SIZE(tcases),
 	.setup = setup,
 	.cleanup = cleanup,
+	.mount_device = 1,
+	.mntpoint = MNTPOINT,
 	.needs_root = 1,
 	.needs_tmpdir = 1,
 	.test_variants = TEST_VARIANTS,