[CRIU] [PATCH v2] zdtm: Add a test to check if we can C/R ghost files with no parent dirs.

[Vitaly Ostrosablin]

This is test that triggers a bug with ghost files, that was resolved in
patch "Don't fail if ghost file has no parent dirs".

Signed-off-by: Vitaly Ostrosablin <vostrosablin at virtuozzo.com>
---
 test/zdtm/static/Makefile                        |  1 +
 test/zdtm/static/unlink_multiple_largefiles.c    | 97 ++++++++++++++++++++++++
 test/zdtm/static/unlink_multiple_largefiles.desc |  1 +
 3 files changed, 99 insertions(+)
 create mode 100644 test/zdtm/static/unlink_multiple_largefiles.c
 create mode 100644 test/zdtm/static/unlink_multiple_largefiles.desc

diff --git a/test/zdtm/static/Makefile b/test/zdtm/static/Makefile
index 0e1db5c5..8c4e5e7a 100644
--- a/test/zdtm/static/Makefile
+++ b/test/zdtm/static/Makefile
@@ -192,6 +192,7 @@ TST_NOFILE	:=				\
 		s390x_mmap_high			\
 		uffd-events			\
 		thread_different_uid_gid	\
+		unlink_multiple_largefiles	\
 #		jobctl00			\
 
 include ../Makefile.inc
diff --git a/test/zdtm/static/unlink_multiple_largefiles.c b/test/zdtm/static/unlink_multiple_largefiles.c
new file mode 100644
index 00000000..bfcf5aae
--- /dev/null
+++ b/test/zdtm/static/unlink_multiple_largefiles.c
@@ -0,0 +1,97 @@
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <signal.h>
+
+#include "zdtmtst.h"
+
+#define FSIZE 0x3B600000ULL
+#define NFILES 10
+
+const char *test_doc = "C/R of ten big (951MiB) unlinked files in root dir";
+const char *test_author = "Vitaly Ostrosablin <vostrosablin at virtuozzo.com>";
+
+int create_unlinked_file(int fileno)
+{
+	int fd;
+	char buf[1000000];
+	char fnm[15];
+
+	sprintf(fnm, "/unlinked%d", fileno);
+	fd = open(fnm, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
+	if (fd < 0) {
+		pr_perror("Cannot create file %s\n", fnm);
+		exit(1);
+	}
+	test_msg("Created file: %s, fd %d\n", fnm, fd);
+
+	if (lseek64(fd, FSIZE, SEEK_SET) < 0) {
+		pr_perror("Cannot seek to offset %llx\n", FSIZE);
+		goto failed;
+	}
+	test_msg("File positioning done, offset=%llx\n", FSIZE);
+
+	int bufsz = sizeof(buf);
+	memset(buf, 0, bufsz);
+	if (write(fd, buf, bufsz) != bufsz) {
+		pr_perror("Cannot write %i bytes to file\n", bufsz);
+		goto failed;
+	}
+	test_msg("%i bytes written to file\n", bufsz);
+
+	if (unlink(fnm) < 0) {
+		pr_perror("Cannot unlink file %s\n", fnm);
+		goto failed;
+	}
+	test_msg("File %s is unlinked\n", fnm);
+
+	return fd;
+failed:
+	unlink(fnm);
+	close(fd);
+	return -1;
+}
+
+int main(int argc, char **argv)
+{
+	int fd[10] = {0};
+	int count = 0;
+
+	test_init(argc, argv);
+
+	// We need to create 10 unlinked files, each is around 1GB in size
+	for (count = 0; count < NFILES; count++) {
+
+		test_msg("Creating unlinked file %d/%d\n", count + 1, NFILES);
+		int tempfd = create_unlinked_file(count);
+
+		if (tempfd < 0) {
+			pr_perror("Cannot create unlinked file %d/%d\n",
+				  count + 1, NFILES);
+			return 1;
+		}
+
+		fd[count] = tempfd;
+	}
+	test_msg("Created %d unlinked files\n", NFILES);
+
+	test_daemon();
+	test_msg("Test daemonized, PID %d\n", getpid());
+	test_waitsig();
+
+	test_msg("PID %d resumed, cleaning up...\n", getpid());
+
+	for (count = 0; count < NFILES; count++) {
+		test_msg("Closing fd #%d (%d)\n", count, fd[count]);
+		if (close(fd[count]) == -1) {
+			pr_perror("Close failed, errno %d\n", errno);
+			return 1;
+		}
+	}
+
+	pass();
+	return 0;
+}
diff --git a/test/zdtm/static/unlink_multiple_largefiles.desc b/test/zdtm/static/unlink_multiple_largefiles.desc
new file mode 100644
index 00000000..ded89879
--- /dev/null
+++ b/test/zdtm/static/unlink_multiple_largefiles.desc
@@ -0,0 +1 @@
+{'flags': 'crfail'}
-- 
2.15.0