zdtm: add two tests for large ghost sparse file

ghost_holes_large00 is a test which creates a large ghost sparse file with 1GiB
hole(pwrite can only handle 2GiB maximum on 32-bit system) and 8KiB data, criu
should be able to handle this kind of situation.

ghost_holes_large01 is a test which creates a large ghost sparse file with 1GiB
hole and 2MiB data, since 2MiB is larger than the default ghost_limit(1MiB),
criu should fail on this test.

v2: fix overflow on 32-bit arch.

Signed-off-by: Liang-Chun Chen <featherclc@gmail.com>

test/zdtm/static/Makefile

@@ -306,6 +306,8 @@ TST_FILE	=				\
 		ghost_holes00			\
 		ghost_holes01			\
 		ghost_holes02			\
+		ghost_holes_large00     \
+		ghost_holes_large01     \
 		unlink_largefile		\
 		mtime_mmap			\
 		fifo				\
@@ -609,6 +611,7 @@ unlink_fstat04:		CFLAGS += -DUNLINK_FSTAT04
 unlink_fstat041:		CFLAGS += -DUNLINK_FSTAT041 -DUNLINK_FSTAT04
 ghost_holes01:		CFLAGS += -DTAIL_HOLE
 ghost_holes02:		CFLAGS += -DHEAD_HOLE
+ghost_holes_large01:		CFLAGS += -DLIMIT
 sk-freebind-false:	CFLAGS += -DZDTM_FREEBIND_FALSE
 selinux02:		CFLAGS += -DUSING_SOCKCREATE
 stopped01:		CFLAGS += -DZDTM_STOPPED_KILL

test/zdtm/static/ghost_holes_large00.c

@@ -0,0 +1,152 @@
+#include <errno.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <linux/limits.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc = "Test ghost with one large hole(1GiB) in the middle";
+const char *test_author = "Liang-Chun Chen <featherclc@gmail.com>";
+
+char *filename;
+TEST_OPTION(filename, string, "file name", 1);
+
+/* Buffer that is suitable for data size */
+#ifdef LIMIT
+#define BUFSIZE 1024 * 1024
+#else
+#define BUFSIZE 4096
+#endif
+static unsigned char buf[BUFSIZE];
+
+#ifndef SEEK_DATA
+#define SEEK_DATA 3
+#define SEEK_HOLE 4
+#endif
+
+#define DATA1_OFF 0
+#define HOLE_SIZE (1LL * 1 * 1024 * 1024 * 1024)
+#define DATA2_OFF (BUFSIZE + HOLE_SIZE)
+#define FILE_SIZE (2 * BUFSIZE + HOLE_SIZE)
+#define ST_UNIT	  512
+
+int main(int argc, char **argv)
+{
+	int fd;
+	struct stat st;
+	uint32_t crc;
+	bool chk_hole = true;
+
+	test_init(argc, argv);
+
+	fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0644);
+	if (fd < 0) {
+		pr_perror("can't open %s", filename);
+		exit(1);
+	}
+
+	if (unlink(filename) < 0) {
+		pr_perror("can't unlink %s", filename);
+		goto failed;
+	}
+
+	crc = ~0;
+	datagen(buf, BUFSIZE, &crc);
+	if (pwrite(fd, buf, BUFSIZE, DATA1_OFF) != BUFSIZE) {
+		pr_perror("can't write data1");
+		goto failed;
+	}
+
+	crc = ~0;
+	datagen(buf, BUFSIZE, &crc);
+	if (pwrite(fd, buf, BUFSIZE, DATA2_OFF) != BUFSIZE) {
+		pr_perror("can't write data2");
+		goto failed;
+	}
+
+	if (ftruncate(fd, FILE_SIZE)) {
+		pr_perror("Can't fixup file size");
+		goto failed;
+	}
+
+	if (lseek(fd, DATA1_OFF, SEEK_HOLE) != DATA1_OFF + BUFSIZE) {
+		test_msg("Won't check for hole\n");
+		chk_hole = false;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	if (fstat(fd, &st) < 0) {
+		fail("can't stat after");
+		goto failed;
+	}
+
+	if (st.st_size != FILE_SIZE) {
+		fail("file size changed to %ld", (long)st.st_size);
+		goto failed;
+	}
+
+	test_msg("file size OK\n");
+
+	if (st.st_blocks * ST_UNIT != 2 * BUFSIZE) {
+		fail("actual file size changed to %ld", (long)st.st_blocks * ST_UNIT);
+		goto failed;
+	}
+
+	test_msg("actual file size OK\n");
+
+	/* Data 1 */
+	if (pread(fd, buf, BUFSIZE, DATA1_OFF) != BUFSIZE) {
+		fail("pread1 fail");
+		goto failed;
+	}
+
+	crc = ~0;
+	if (datachk(buf, BUFSIZE, &crc)) {
+		fail("datachk1 fail");
+		goto failed;
+	}
+
+	test_msg("Data1 OK\n");
+
+	/* Data 2 */
+	if (pread(fd, buf, BUFSIZE, DATA2_OFF) != BUFSIZE) {
+		fail("pread2 fail");
+		goto failed;
+	}
+
+	crc = ~0;
+	if (datachk(buf, BUFSIZE, &crc)) {
+		fail("datachk2 fail");
+		goto failed;
+	}
+
+	test_msg("Data2 OK\n");
+
+	/* Hole */
+	if (chk_hole) {
+		if (lseek(fd, DATA1_OFF, SEEK_HOLE) != DATA1_OFF + BUFSIZE) {
+			fail("Begin of mid hole not found");
+			goto failed;
+		}
+		if (lseek(fd, DATA1_OFF + BUFSIZE, SEEK_DATA) != DATA2_OFF) {
+			fail("End of mid hole not found");
+			goto failed;
+		}
+		test_msg("Mid hole OK\n");
+	}
+
+	close(fd);
+	pass();
+	return 0;
+
+failed:
+	close(fd);
+	return 1;
+}

test/zdtm/static/ghost_holes_large01.c

@@ -0,0 +1 @@
+ghost_holes_large00.c

test/zdtm/static/ghost_holes_large01.desc

@@ -0,0 +1 @@
+{'flags': 'crfail'}