[LTP] [PATCH] mmap/mmap12.c: new case to test MAP_POPULATE of mmap

[DAN LI <li.dan@cn.fujitsu.com>]

Create test case for MAP_POPULATE of mmap.

Verify the following statement
"For a file mapping,this causes read-ahead on the file.
 Later accesses to the mapping will not be blocked by page faults."
by mmap-ing a file with specified size and checking change of memory size.


Signed-off-by: DAN LI <li.dan@cn.fujitsu.com>
---
 testcases/kernel/syscalls/mmap/mmap12.c | 163 ++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 testcases/kernel/syscalls/mmap/mmap12.c

diff --git a/testcases/kernel/syscalls/mmap/mmap12.c b/testcases/kernel/syscalls/mmap/mmap12.c
new file mode 100644
index 0000000..4092806
--- /dev/null
+++ b/testcases/kernel/syscalls/mmap/mmap12.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2013 FNST, DAN LI <li.dan@cn.fujitsu.com>
+ *
+ * This program is free software;  you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY;  without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program;  if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * Test Description:
+ *  Verify MAP_POPULATE works fine.
+ *  "For a file mapping, this causes read-ahead on the file.
+ *   Later accesses to the mapping will not be blocked by page faults"
+ *
+ * Expected Result:
+ *  mmap() with MAP_POPULATE should succeed returning the address of the
+ *  mapped region and this file has been read into RAM, so RAM should
+ *  is reduced by at least size of file.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <signal.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/shm.h>
+#include <sys/sysinfo.h>
+
+#include "test.h"
+#include "usctest.h"
+
+#define TEMPFILE	"mmapfile"
+#define MMAPSIZE	(400UL<<20)
+#define FLUCTUATION	(50UL<<20)
+
+char *TCID = "mmap12";
+int TST_TOTAL = 1;
+
+static char *addr;
+static int fildes;
+static struct sysinfo info;
+static unsigned long long freeram_before;
+static unsigned long long freeram_after;
+
+static void loop_setup(void);
+static void loop_cleanup(void);
+static void setup(void);
+static void cleanup(void);
+
+int main(int argc, char *argv[])
+{
+	int lc;
+	int ret = 0;
+	char *msg;
+
+	msg = parse_opts(argc, argv, NULL, NULL);
+	if (msg != NULL)
+		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
+
+	setup();
+
+	for (lc = 0; TEST_LOOPING(lc); lc++) {
+
+		tst_count = 0;
+
+		loop_setup();
+
+		errno = 0;
+		addr = mmap(NULL, MMAPSIZE, PROT_READ | PROT_WRITE,
+			    MAP_FILE | MAP_PRIVATE | MAP_POPULATE, fildes, 0);
+
+		if (addr == MAP_FAILED) {
+			tst_resm(TFAIL | TERRNO, "mmap of %s failed", TEMPFILE);
+			continue;
+		}
+
+		if (STD_FUNCTIONAL_TEST) {
+			ret = sysinfo(&info);
+			if (ret != 0)
+				tst_brkm(TFAIL, cleanup, "sysinfo failed");
+			freeram_after =
+				(unsigned long long)info.freeram *
+				(unsigned long long)info.mem_unit;
+
+			if ((freeram_before - freeram_after) >=
+			    (MMAPSIZE - FLUCTUATION))
+				tst_resm(TPASS,
+					 "Functionality of mmap() successful");
+			else
+				tst_resm(TFAIL,
+					 "Seems read-ahead do not work");
+		}
+		loop_cleanup();
+	}
+
+	cleanup();
+	tst_exit();
+
+}
+
+static void loop_setup(void)
+{
+	int ret;
+
+	fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666);
+	if (fildes < 0)
+		tst_brkm(TFAIL, cleanup, "opening %s failed", TEMPFILE);
+
+
+	if (ftruncate(fildes, MMAPSIZE) < 0)
+		tst_brkm(TFAIL | TERRNO, cleanup, "ftruncate file failed");
+
+	ret = sysinfo(&info);
+	if (ret != 0)
+		tst_brkm(TFAIL, cleanup, "sysinfo failed");
+
+	freeram_before =
+		(unsigned long long)info.freeram *
+		(unsigned long long)info.mem_unit;
+}
+
+static void loop_cleanup(void)
+{
+	if (munmap(addr, MMAPSIZE) != 0)
+		tst_brkm(TFAIL | TERRNO, NULL, "munmap failed");
+
+	close(fildes);
+}
+
+static void setup(void)
+{
+	tst_sig(FORK, DEF_HANDLER, cleanup);
+
+	if ((tst_kvercmp(2, 6, 23)) < 0)
+		tst_brkm(TCONF, NULL,
+			"This test can only run on kernels that are 2.6.23 and "
+			"higher");
+
+	TEST_PAUSE;
+
+	tst_tmpdir();
+}
+
+static void cleanup(void)
+{
+	TEST_CLEANUP;
+	tst_rmdir();
+}
-- 
1.8.1

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