[PATCH] xfstests: test the aio unwrittent extent conversion race

[Christoph Hellwig <hch@infradead.org>]

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfstests-dev/239
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ xfstests-dev/239	2010-06-26 11:38:22.000000000 +0000
@@ -0,0 +1,58 @@
+#! /bin/bash
+# FS QA Test No. 239
+#
+# Read from a sparse file immedialy after filling a hole to test for races
+# in unwritten extent conversion.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2010 Red Hat, Inc.  All Rights Reserved.
+#
+# 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.
+#
+# This program is distributed in the hope that it would 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 the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#-----------------------------------------------------------------------
+#
+# creator
+owner=dchinner@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+    cd /
+    rm -f $TEST_DIR/tst-aio-dio-sparse-unwritten
+}
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fs generic
+_supported_os Linux
+
+AIO_TEST=src/aio-dio-regress/aio-dio-hole-filling-race
+[ -x $AIO_TEST ] || _notrun "$AIO_TEST not built"
+
+echo "Silence is golden"
+
+for i in `seq 1 500`; do
+  $AIO_TEST $TEST_DIR/tst-aio-dio-hole-filling-race || break
+done
+
+status=$?
+exit
Index: xfstests-dev/239.out
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ xfstests-dev/239.out	2010-06-26 11:38:47.000000000 +0000
@@ -0,0 +1,2 @@
+QA output created by 239
+Silence is golden
Index: xfstests-dev/group
===================================================================
--- xfstests-dev.orig/group	2010-06-26 11:35:07.000000000 +0000
+++ xfstests-dev/group	2010-06-26 11:35:18.000000000 +0000
@@ -352,3 +352,4 @@ deprecated
 236 auto quick metadata
 237 auto quick acl
 238 auto quick metadata ioctl
+239 auto aio rw
Index: xfstests-dev/src/aio-dio-regress/aio-dio-hole-filling-race.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ xfstests-dev/src/aio-dio-regress/aio-dio-hole-filling-race.c	2010-06-26 11:39:40.000000000 +0000
@@ -0,0 +1,123 @@
+/*
+ * Read from a sparse file immedialy after filling a hole to test for races
+ * in unwritten extent conversion.
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights reserved.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libaio.h>
+
+#define BUF_SIZE	4096
+#define IO_PATTERN	0xab
+
+int main(int argc, char *argv[])
+{
+	struct io_context *ctx = NULL;
+	struct io_event ev;
+	struct iocb iocb, *iocbs[] = { &iocb };
+	void *buf;
+	char cmp_buf[BUF_SIZE];
+	int fd, err = 0;
+
+	fd = open(argv[1], O_DIRECT | O_CREAT | O_TRUNC | O_RDWR, 0600);
+	if (fd == -1) {
+		perror("open");
+		return 1;
+	}
+
+	err = posix_memalign(&buf, BUF_SIZE, BUF_SIZE);
+	if (err) {
+		fprintf(stderr, "error %s during %s\n",
+			strerror(-err),
+			"posix_memalign");
+		return 1;
+	}
+	memset(buf, IO_PATTERN, BUF_SIZE);
+	memset(cmp_buf, IO_PATTERN, BUF_SIZE);
+
+	/*
+	 * Truncate to some random large file size.  Just make sure
+	 * it's not smaller than our I/O size.
+	 */
+	if (ftruncate(fd, 1024 * 1024 * 1024) < 0) {
+		perror("ftruncate");
+		return 1;
+	}
+
+
+	/*
+	 * Do a simple 4k write into a hole using aio.
+	 */
+	err = io_setup(1, &ctx);
+	if (err) {
+		fprintf(stderr, "error %s during %s\n",
+			strerror(-err),
+			"io_setup");
+		return 1;
+	}
+
+	io_prep_pwrite(&iocb, fd, buf, BUF_SIZE, 0);
+
+	err = io_submit(ctx, 1, iocbs);
+	if (err != 1) {
+		fprintf(stderr, "error %s during %s\n",
+			strerror(-err),
+			"io_submit");
+		return 1;
+	}
+
+	err = io_getevents(ctx, 1, 1, &ev, NULL);
+	if (err != 1) {
+		fprintf(stderr, "error %s during %s\n",
+			strerror(-err),
+			"io_getevents");
+		return 1;
+	}
+
+	/*
+	 * And then read it back.
+	 *
+	 * Using pread to keep it simple, but AIO has the same effect.
+	 */
+	if (pread(fd, buf, BUF_SIZE, 0) != BUF_SIZE) {
+		perror("pread");
+		return 1;
+	}
+
+	/*
+	 * And depending on the machine we'll just get zeroes back quite
+	 * often here.  That's because the unwritten extent conversion
+	 * hasn't finished.
+	 */
+	if (memcmp(buf, cmp_buf, BUF_SIZE)) {
+		unsigned long long *ubuf = (unsigned long long *)buf;
+		int i;
+
+		for (i = 0; i < BUF_SIZE / sizeof(unsigned long long); i++)
+			printf("%d: 0x%llx\n", i, ubuf[i]);
+		return 1;
+	}
+
+	return 0;
+}

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