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[PATCH] xfstests: pwrite hang when writing from mmaped buffer of the sam

To: xfs@xxxxxxxxxxx
Subject: [PATCH] xfstests: pwrite hang when writing from mmaped buffer of the same page
From: "Zhong, Xin" <xin.zhong@xxxxxxxxx>
Date: Mon, 13 Dec 2010 15:24:43 +0800
Cc: xin.zhong@xxxxxxxxx
The problem is found in meego testing:
http://bugs.meego.com/show_bug.cgi?id=6672
Only btrfs has this problem so far. Other linux fs works well.

Signed-off-by: Zhong, Xin <xin.zhong@xxxxxxxxx>
---
 248                       |   57 ++++++++++++++++++++++++++++++++++++++++
 248.out                   |    2 +
 group                     |    1 +
 src/Makefile              |    2 +-
 src/pwrite_mmap_blocked.c |   63 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 124 insertions(+), 1 deletions(-)
 create mode 100644 248
 create mode 100644 248.out
 create mode 100644 src/pwrite_mmap_blocked.c

diff --git a/248 b/248
new file mode 100644
index 0000000..3e996d3
--- /dev/null
+++ b/248
@@ -0,0 +1,57 @@
+#! /bin/bash
+# FS QA Test No. 248
+#
+# Test for pwrite hang problem when writing from mmaped buffer of the same 
page 
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2010 YOUR NAME HERE.  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=xin.zhong@xxxxxxxxx
+
+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 $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+
+TESTFILE=$TEST_DIR/test_file
+TEST_PROG=$here/src/pwrite_mmap_blocked
+
+$TEST_PROG $TESTFILE
+
+# success, all done
+status=0
+exit
diff --git a/248.out b/248.out
new file mode 100644
index 0000000..d02c1ac
--- /dev/null
+++ b/248.out
@@ -0,0 +1,2 @@
+QA output created by 248
+pwrite 1 bytes from 2 to 3
diff --git a/group b/group
index 0f94dd9..0b4f514 100644
--- a/group
+++ b/group
@@ -361,3 +361,4 @@ deprecated
 245 auto quick dir
 246 auto quick rw
 247 auto quick rw
+248 other
diff --git a/src/Makefile b/src/Makefile
index b827bd0..47d7334 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -17,7 +17,7 @@ LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize 
preallo_rw_pattern_reader \
        preallo_rw_pattern_writer ftrunc trunc fs_perms testx looptest \
        locktest unwritten_mmap bulkstat_unlink_test t_stripealign \
        bulkstat_unlink_test_modified t_dir_offset t_futimens t_immutable \
-       stale_handle
+       stale_handle pwrite_mmap_blocked
 
 SUBDIRS =
 
diff --git a/src/pwrite_mmap_blocked.c b/src/pwrite_mmap_blocked.c
new file mode 100644
index 0000000..40d7f7b
--- /dev/null
+++ b/src/pwrite_mmap_blocked.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <sys/mman.h>
+#include <sys/signal.h>
+#include <sys/stat.h>
+
+char *progname;
+loff_t size;
+int fd;
+char *filename="./test_file";
+void *mapped_mem;
+
+
+int main(int argc, char *argv[])
+{
+       int ret;
+
+       progname = argv[0];
+       size = 5;
+       fd = open(argv[1], O_RDWR|O_TRUNC|O_CREAT, 0666);
+       if (fd < 0) {
+               fprintf(stderr, "%s: Cannot open `%s': %s\n",
+                       progname, filename, strerror(errno));
+               exit(1);
+       }
+
+       char *cc = "01234";
+       if ((ret = pwrite(fd, (const char *)cc,
+                               size, 0)) != size) {
+               fprintf(stderr, "%s: pwrite returned %d\n",
+                       __FUNCTION__, ret);
+               perror("pwrite");
+               exit(1);
+       }
+
+       mapped_mem = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+       if (mapped_mem == MAP_FAILED) {
+               perror("mmap");
+               exit(1);
+       }
+       loff_t amount = 1;
+       loff_t from = 2;
+       loff_t to = 3;
+       printf("pwrite %Ld bytes from %Ld to %Ld\n", amount, from, to);
+       if ((ret = pwrite(fd, (char *)mapped_mem + from, amount, to)) != 
amount) {
+               printf("%s: pwrite returned %d, not %Ld\n",
+                                       __FUNCTION__, ret, amount);
+               if (errno == EFAULT) {
+                       printf("pwrite: EFAULT\n");
+               } else if (ret < 0) {
+                       perror("pwrite");
+                       exit(1);
+               }
+       }
+       munmap(mapped_mem,0);
+       close(fd);
+       exit(0);
+}
-- 
1.6.2.2

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