[LTP] [RFC PATCH] regression test for 64bit sendfile capped at 2G

[Han Pingtian <hanpt@linux.vnet.ibm.com>]

Hi,

Please review this patch. Thanks.

There is a bug on 64bit sendfile() with large file, please see
https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-June/118128.html
for details.

This sendfile09.c was copied from sendfile02.c and using plain
file as the out_file. The file size is 4G (4294967296 bytes).
---
 testcases/kernel/syscalls/sendfile/sendfile09.c | 245 ++++++++++++++++++++++++
 1 file changed, 245 insertions(+)
 create mode 100644 testcases/kernel/syscalls/sendfile/sendfile09.c

diff --git a/testcases/kernel/syscalls/sendfile/sendfile09.c b/testcases/kernel/syscalls/sendfile/sendfile09.c
new file mode 100644
index 0000000..d88a72f
--- /dev/null
+++ b/testcases/kernel/syscalls/sendfile/sendfile09.c
@@ -0,0 +1,245 @@
+/*
+ *
+ *   Copyright (c) International Business Machines  Corp., 2001
+ *
+ *   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
+ */
+
+/*
+ * NAME
+ *	sendfile09.c
+ *
+ * DESCRIPTION
+ *	Testcase copied from sendfile02.c to test the basic functionality of the sendfile(2) system call on large file.
+ *
+ * ALGORITHM
+ *	1. call sendfile(2) with offset = 0
+ *	2. call sendfile(2) with offset in the middle of the file
+ *
+ * USAGE:  <for command-line>
+ *  sendfile09 [-c n] [-i n] [-I x] [-P x] [-t]
+ *     where,
+ *             -i n : Execute test n times.
+ *             -I x : Execute test for x seconds.
+ *             -P x : Pause for x seconds between iterations.
+ *             -t   : Turn on syscall timing.
+ *
+ *
+ * RESTRICTIONS
+ *	Only supports 64bit systems and kernel 2.6.33 or above
+ */
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/sendfile.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include "usctest.h"
+#include "test.h"
+
+#ifndef OFF_T
+#define OFF_T off_t
+#endif /* Not def: OFF_T */
+
+TCID_DEFINE(sendfile09);
+int TST_TOTAL = 4;
+
+char in_file[100];
+char out_file[100];
+int out_fd;
+
+void cleanup(void);
+void setup(void);
+
+struct test_case_t {
+	char *desc;
+	int offset;
+	int64_t exp_retval;
+	int64_t exp_updated_offset;
+} testcases[] = {
+	{
+	"Test sendfile(2) with offset = 0", 0, 4294967296, 4294967296}, {
+	"Test sendfile(2) with offset in the middle of file", 2, 4294967294, 4294967296}, {
+	"Test sendfile(2) with offset in the middle of file", 4, 4294967292, 4294967296}, {
+	"Test sendfile(2) with offset in the middle of file", 6, 4294967290, 4294967296}
+};
+
+#ifdef UCLINUX
+static char *argv0;
+#endif
+
+void do_sendfile(OFF_T offset, int i)
+{
+	int in_fd;
+	struct stat sb;
+	int wait_status;
+	int wait_stat;
+	off_t before_pos, after_pos;
+
+	if ((out_fd = open(out_file, O_WRONLY)) < 0) {
+		tst_brkm(TBROK, cleanup, "open failed: %d", errno);
+	}
+
+	if ((in_fd = open(in_file, O_RDONLY)) < 0) {
+		tst_brkm(TBROK, cleanup, "open failed: %d", errno);
+	}
+
+	if (stat(in_file, &sb) < 0) {
+		tst_brkm(TBROK, cleanup, "stat failed: %d", errno);
+	}
+
+	if ((before_pos = lseek(in_fd, 0, SEEK_CUR)) < 0) {
+		tst_brkm(TBROK, cleanup,
+			 "lseek before invoking sendfile failed: %d", errno);
+	}
+
+	TEST(sendfile(out_fd, in_fd, &offset, sb.st_size - offset));
+
+	if (TEST_RETURN == -1) {
+		tst_brkm(TBROK, cleanup, "sendfile(2) failed: %s",
+			strerror(TEST_RETURN));
+	}
+
+	if ((after_pos = lseek(in_fd, 0, SEEK_CUR)) < 0) {
+		tst_brkm(TBROK, cleanup,
+			 "lseek after invoking sendfile failed: %d", errno);
+	}
+
+	if (TEST_RETURN != testcases[i].exp_retval) {
+		tst_resm(TFAIL, "sendfile(2) failed to return "
+			 "expected value, expected: %" PRId64 ", "
+			 "got: %" PRId64, testcases[i].exp_retval,
+			 TEST_RETURN);
+	} else if (offset != testcases[i].exp_updated_offset) {
+		tst_resm(TFAIL, "sendfile(2) failed to update "
+			 "OFFSET parameter to expected value, "
+			 "expected: %" PRId64 ", got: %" PRId64,
+			 testcases[i].exp_updated_offset,
+			 (int64_t) offset);
+	} else if (before_pos != after_pos) {
+		tst_resm(TFAIL, "sendfile(2) updated the file position "
+			 " of in_fd unexpectedly, expected file position: %"
+			 PRId64 ", " " actual file position %" PRId64,
+			 (int64_t) before_pos, (int64_t) after_pos);
+	} else {
+		tst_resm(TPASS, "functionality of sendfile() is "
+			 "correct");
+		wait_status = waitpid(-1, &wait_stat, 0);
+	}
+
+	close(in_fd);
+	close(out_fd);
+}
+
+/*
+ * setup() - performs all ONE TIME setup for this test.
+ */
+void setup(void)
+{
+	int fd;
+	int i;
+
+	tst_sig(FORK, DEF_HANDLER, cleanup);
+
+	TEST_PAUSE;
+
+	/* make a temporary directory and cd to it */
+	tst_tmpdir();
+	sprintf(in_file, "in.%d", getpid());
+	if ((fd = creat(in_file, 00700)) < 0) {
+		tst_brkm(TBROK, cleanup, "creat failed in setup, errno: %d",
+			 errno);
+	}
+
+	/* create a 4G file */
+	for (i = 1; i <= (4 * 1024); i++) {
+		if (lseek(fd, (1024 * 1024 - 1), SEEK_CUR) < 0) {
+			tst_brkm(TBROK, cleanup, "lseek failed, errno: %d", errno);
+		}
+
+		if (write(fd, "C", 1) < 0) {
+			tst_brkm(TBROK, cleanup, "write failed, errno: %d", errno);
+		}
+	}
+
+	close(fd);
+	sprintf(out_file, "out.%d", getpid());
+	if ((fd = creat(out_file, 00700)) < 0) {
+		tst_brkm(TBROK, cleanup, "creat failed in setup, errno: %d",
+			 errno);
+	}
+	close(fd);
+}
+
+/*
+ * cleanup() - performs all ONE TIME cleanup for this test at
+ *	       completion or premature exit.
+ */
+void cleanup(void)
+{
+	/*
+	 * print timing stats if that option was specified.
+	 * print errno log if that option was specified.
+	 */
+	TEST_CLEANUP;
+
+	close(out_fd);
+	/* delete the test directory created in setup() */
+	tst_rmdir();
+
+}
+
+int main(int ac, char **av)
+{
+	int i;
+	int lc;
+	const char *msg;		/* parse_opts() return message */
+
+#if __WORDSIZE == 32
+	tst_brkm(TCONF, NULL, "This test is only for 64bit");
+#endif
+
+	if (tst_kvercmp(2, 6, 33) < 0) {
+		tst_resm(TINFO, "sendfile(2) on large file skipped for kernels < 2.6.33");
+		return;
+	}
+
+	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) {
+		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
+	}
+#ifdef UCLINUX
+	argv0 = av[0];
+#endif
+
+	setup();
+
+	/*
+	 * The following loop checks looping state if -c option given
+	 */
+	for (lc = 0; TEST_LOOPING(lc); lc++) {
+		tst_count = 0;
+
+		for (i = 0; i < TST_TOTAL; ++i) {
+			do_sendfile(testcases[i].offset, i);
+		}
+	}
+	cleanup();
+
+	tst_exit();
+}
-- 
1.9.3


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