generic: add mmap write vs truncate test

This test exposed a problem with mapped writes to the tail page of a file in XFS. Hence make it a generic test so taht we can ensure that all fielsystems handle the case correctly. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
2026-05-01 15:01:44 -07:00 · 2014-09-29 12:56:48 +10:00
parent 2a726f6f00
commit d7b517da5f
3 changed files with 189 additions and 0 deletions
@@ -0,0 +1,123 @@
+#! /bin/bash
+# FS QA Test No. generic/029
+#
+# Test mapped writes against truncate down/up to ensure we get the data
+# correctly written. This can expose data corruption bugs on filesystems where
+# the block size is smaller than the page size.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2014 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
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+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 $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os IRIX Linux
+_require_scratch
+
+testfile=$SCRATCH_MNT/testfile
+
+_scratch_mkfs > /dev/null 2>&1
+_scratch_mount
+
+# first case is just truncate down/truncate up to check that the mapped
+# write after the truncate up is correctly handled.
+$XFS_IO_PROG -t -f \
+-c "truncate 5120"              `# truncate     |                        |` \
+-c "pwrite -S 0x58 0 5120"      `# write        |XXXXXXXXXXXXXXXXXXXXXXXX|` \
+-c "mmap -rw 0 5120"            `# mmap         |                        |` \
+-c "mwrite -S 0x5a 2048 3072"   `# mwrite       |          ZZZZZZZZZZZZZZ|` \
+-c "truncate 2048"              `# truncate dn  |         |` \
+-c "truncate 5120"              `# truncate up  |                        |` \
+-c "mwrite -S 0x59 2048 3072"   `# mwrite       |          YYYYYYYYYYYYYY|` \
+-c "close"      \
+$testfile | _filter_xfs_io
+
+echo "==== Pre-Remount ==="
+hexdump -C $testfile
+_scratch_remount
+echo "==== Post-Remount =="
+hexdump -C $testfile
+
+rm -f $testfile
+sync
+
+# second case is to do a mwrite between the truncate to a block on the
+# same page we are truncating within the EOF. This checks that a mapped
+# write between truncate down and truncate up a further mapped
+# write to the same page into the new space doesn't result in data being lost.
+$XFS_IO_PROG -t -f \
+-c "truncate 5120"              `# truncate     |                        |` \
+-c "pwrite -S 0x58 0 5120"      `# write        |XXXXXXXXXXXXXXXXXXXXXXXX|` \
+-c "mmap -rw 0 5120"            `# mmap         |                        |` \
+-c "mwrite -S 0x5a 2048 3072"   `# mwrite       |          ZZZZZZZZZZZZZZ|` \
+-c "truncate 2048"              `# truncate dn  |         |` \
+-c "mwrite -S 0x57 1024 1024"   `# mwrite       |     WWWWW              |` \
+-c "truncate 5120"              `# truncate up  |                        |` \
+-c "mwrite -S 0x59 2048 3072"   `# mwrite       |          YYYYYYYYYYYYYY|` \
+-c "close"      \
+$testfile | _filter_xfs_io
+ 
+echo "==== Pre-Remount ==="
+hexdump -C $testfile
+_scratch_remount
+echo "==== Post-Remount =="
+hexdump -C $testfile
+
+# third case is the same as second case, just with non-1k aligned offsets and
+# sizes.
+$XFS_IO_PROG -t -f \
+-c "truncate 5121"              `# truncate     |                        |` \
+-c "pwrite -S 0x58 0 5121"      `# write        |XXXXXXXXXXXXXXXXXXXXXXXX|` \
+-c "mmap -rw 0 5121"            `# mmap         |                        |` \
+-c "mwrite -S 0x5a 2047 3071"   `# mwrite       |          ZZZZZZZZZZZZZZ|` \
+-c "truncate 2047"              `# truncate dn  |         |` \
+-c "mwrite -S 0x57 513 1025"    `# mwrite       |  WWWWW                 |` \
+-c "truncate 5121"              `# truncate up  |                        |` \
+-c "mwrite -S 0x59 2047 3071"   `# mwrite       |          YYYYYYYYYYYYYY|` \
+-c "close"      \
+$testfile | _filter_xfs_io
+ 
+echo "==== Pre-Remount ==="
+hexdump -C $testfile
+_scratch_remount
+echo "==== Post-Remount =="
+hexdump -C $testfile
+
+status=0
+exit
+
@@ -0,0 +1,65 @@
+QA output created by 029
+wrote 5120/5120 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+==== Pre-Remount ===
+00000000  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+00000800  59 59 59 59 59 59 59 59  59 59 59 59 59 59 59 59  |YYYYYYYYYYYYYYYY|
+*
+00001400
+==== Post-Remount ==
+00000000  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+00000800  59 59 59 59 59 59 59 59  59 59 59 59 59 59 59 59  |YYYYYYYYYYYYYYYY|
+*
+00001400
+wrote 5120/5120 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+==== Pre-Remount ===
+00000000  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+00000400  57 57 57 57 57 57 57 57  57 57 57 57 57 57 57 57  |WWWWWWWWWWWWWWWW|
+*
+00000800  59 59 59 59 59 59 59 59  59 59 59 59 59 59 59 59  |YYYYYYYYYYYYYYYY|
+*
+00001400
+==== Post-Remount ==
+00000000  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+00000400  57 57 57 57 57 57 57 57  57 57 57 57 57 57 57 57  |WWWWWWWWWWWWWWWW|
+*
+00000800  59 59 59 59 59 59 59 59  59 59 59 59 59 59 59 59  |YYYYYYYYYYYYYYYY|
+*
+00001400
+wrote 5121/5121 bytes at offset 0
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+==== Pre-Remount ===
+00000000  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+00000200  58 57 57 57 57 57 57 57  57 57 57 57 57 57 57 57  |XWWWWWWWWWWWWWWW|
+00000210  57 57 57 57 57 57 57 57  57 57 57 57 57 57 57 57  |WWWWWWWWWWWWWWWW|
+*
+00000600  57 57 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |WWXXXXXXXXXXXXXX|
+00000610  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+000007f0  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 59  |XXXXXXXXXXXXXXXY|
+00000800  59 59 59 59 59 59 59 59  59 59 59 59 59 59 59 59  |YYYYYYYYYYYYYYYY|
+*
+000013f0  59 59 59 59 59 59 59 59  59 59 59 59 59 59 00 00  |YYYYYYYYYYYYYY..|
+00001400  00                                                |.|
+00001401
+==== Post-Remount ==
+00000000  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+00000200  58 57 57 57 57 57 57 57  57 57 57 57 57 57 57 57  |XWWWWWWWWWWWWWWW|
+00000210  57 57 57 57 57 57 57 57  57 57 57 57 57 57 57 57  |WWWWWWWWWWWWWWWW|
+*
+00000600  57 57 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |WWXXXXXXXXXXXXXX|
+00000610  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 58  |XXXXXXXXXXXXXXXX|
+*
+000007f0  58 58 58 58 58 58 58 58  58 58 58 58 58 58 58 59  |XXXXXXXXXXXXXXXY|
+00000800  59 59 59 59 59 59 59 59  59 59 59 59 59 59 59 59  |YYYYYYYYYYYYYYYY|
+*
+000013f0  59 59 59 59 59 59 59 59  59 59 59 59 59 59 00 00  |YYYYYYYYYYYYYY..|
+00001400  00                                                |.|
+00001401
@@ -31,6 +31,7 @@
 026 acl quick auto
 027 auto enospc
 028 auto quick
+029 auto quick rw
 053 acl repair auto quick
 062 attr udf auto quick
 068 other auto freeze dangerous stress