[LTP] [PATCH 2/2] syscalls/quotactl03.c: add new regression test

[Xiao Yang]

This kernel bug of xfs has been fixed in:

commit 657bdfb7f5e68ca5e2ed009ab473c429b0d6af85
Author: Eric Sandeen <sandeen@redhat.com>
Date:   Tue Jan 17 11:43:38 2017 -0800

	xfs: don't wrap ID in xfs_dq_get_next_id

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
---
 runtest/syscalls                                |   1 +
 testcases/kernel/syscalls/.gitignore            |   1 +
 testcases/kernel/syscalls/quotactl/quotactl03.c | 105 ++++++++++++++++++++++++
 3 files changed, 107 insertions(+)
 create mode 100644 testcases/kernel/syscalls/quotactl/quotactl03.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 15ae66e..1ae1d39 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -849,6 +849,7 @@ pwritev02_64 pwritev02_64
 
 quotactl01 quotactl01
 quotactl02 quotactl02
+quotactl03 quotactl03
 
 read01 read01
 read02 read02
diff --git a/testcases/kernel/syscalls/.gitignore b/testcases/kernel/syscalls/.gitignore
index fad662c..e01d906 100644
--- a/testcases/kernel/syscalls/.gitignore
+++ b/testcases/kernel/syscalls/.gitignore
@@ -713,6 +713,7 @@
 /pwritev/pwritev02_64
 /quotactl/quotactl01
 /quotactl/quotactl02
+/quotactl/quotactl03
 /read/read01
 /read/read02
 /read/read03
diff --git a/testcases/kernel/syscalls/quotactl/quotactl03.c b/testcases/kernel/syscalls/quotactl/quotactl03.c
new file mode 100644
index 0000000..9aa1375
--- /dev/null
+++ b/testcases/kernel/syscalls/quotactl/quotactl03.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2017 Fujitsu Ltd.
+ * Author: Xiao Yang <yangx.jy@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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Test Name: quotactl03
+ *
+ * Description:
+ * quotactl(2) with XGETNEXTQUOTA looks for the next active quota for an user
+ * equal or higher to a given ID, in this test the ID is specified to a value
+ * close to UINT_MAX(max value of unsigned int). When reaching the upper limit
+ * and finding no active quota, it should return -1 and set errno to ENOENT.
+ * Actually, quotactl(2) overflows and and return 0 as the "next" active id.
+ *
+ * This kernel bug of xfs has been fixed in:
+ *
+ * commit 657bdfb7f5e68ca5e2ed009ab473c429b0d6af85
+ * Author: Eric Sandeen <sandeen@redhat.com>
+ * Date:   Tue Jan 17 11:43:38 2017 -0800
+ *
+ *     xfs: don't wrap ID in xfs_dq_get_next_id
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/quota.h>
+#include "config.h"
+
+#if defined(HAVE_QUOTAV2) || defined(HAVE_QUOTAV1)
+# include <sys/quota.h>
+#endif
+
+#if defined(HAVE_XFS_QUOTA)
+# include <xfs/xqm.h>
+#endif
+
+#include "tst_test.h"
+
+#if defined(HAVE_XFS_QUOTA) && (defined(HAVE_QUOTAV2) || defined(HAVE_QUOTAV1))
+
+# ifdef Q_XGETNEXTQUOTA
+
+static const char mntpoint[] = "mnt_point";
+static uint32_t test_id = 4294967292;
+
+static void verify_quota(void)
+{
+	struct fs_disk_quota res_dquota;
+
+	res_dquota.d_id = 1;
+
+	TEST(quotactl(QCMD(Q_XGETNEXTQUOTA, USRQUOTA), tst_device->dev,
+		test_id, (void *)&res_dquota));
+	if (TEST_RETURN != -1) {
+		tst_res(TFAIL, "quotactl() found the next active ID: %u "
+			"unexpectedly when asking for it past UINT_MAX.",
+			res_dquota.d_id);
+		return;
+	}
+
+	if (TEST_ERRNO != ENOENT) {
+		tst_res(TFAIL | TTERRNO, "quotactl() couldn't find the next "
+			"active ID expectedly when asking for it past UINT_MAX"
+			", but returns %s instead of ENOENT.",
+			tst_strerrno(TEST_ERRNO));
+	} else {
+		tst_res(TPASS, "quotactl() couldn't find the next active ID "
+			"expectedly when asking for it past UINT_MAX, and "
+			"return ENOENT.");
+	}
+}
+
+static struct tst_test test = {
+	.tid = "quotactl03",
+	.needs_tmpdir = 1,
+	.needs_root = 1,
+	.test_all = verify_quota,
+	.mount_device = 1,
+	.dev_fs_type = "xfs",
+	.mntpoint = mntpoint,
+	.mnt_data = "usrquota",
+};
+# else
+	TST_TEST_TCONF("This system didn't support Q_XGETNEXTQUOTA");
+# endif
+
+#else
+	TST_TEST_TCONF("This system didn't support quota or xfs quota");
+#endif
-- 
1.8.3.1