[PATCH 15/23] reflink: test xfs cow behavior when the filesystem crashes

["Darrick J. Wong" <darrick.wong@oracle.com>]

Use the extent size hint to force leftover CoW reservations then
crash the filesystem to see how recovery works.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 tests/xfs/212     |  106 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/212.out |   14 +++++++
 tests/xfs/group   |    1 +
 3 files changed, 121 insertions(+)
 create mode 100755 tests/xfs/212
 create mode 100644 tests/xfs/212.out


diff --git a/tests/xfs/212 b/tests/xfs/212
new file mode 100755
index 0000000..ccddf05
--- /dev/null
+++ b/tests/xfs/212
@@ -0,0 +1,106 @@
+#! /bin/bash
+# FS QA Test No. 212
+#
+# Test recovery of "lost" CoW blocks after a crash:
+# - Create two reflinked files.  Set extsz hint on second file.
+# - Dirty one byte on the second file and fsync.
+# - Crash the FS to test recovery.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016, Oracle and/or its affiliates.  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 -rf "$tmp".* "$testdir"
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/reflink
+
+# real QA test starts here
+_supported_os Linux
+_supported_fs xfs
+_require_scratch_reflink
+_require_cp_reflink
+_require_fiemap
+
+rm -f "$seqres.full"
+
+echo "Format and mount"
+_scratch_mkfs > "$seqres.full" 2>&1
+_scratch_mount >> "$seqres.full" 2>&1
+
+testdir="$SCRATCH_MNT/test-$seq"
+rm -rf $testdir
+mkdir $testdir
+
+blksz=65536
+nr=16
+bsz=2
+
+free_blocks=$(stat -f -c '%a' "$testdir")
+real_blksz=$(stat -f -c '%S' "$testdir")
+space_needed=$(((blksz * nr * 3) * 5 / 4))
+space_avail=$((free_blocks * real_blksz))
+internal_blks=$((blksz * nr / real_blksz))
+test $space_needed -gt $space_avail && _notrun "Not enough space. $space_avail < $space_needed"
+
+echo "Create the original files"
+"$XFS_IO_PROG" -f -c "pwrite -S 0x61 -b $((blksz * bsz)) 0 $((blksz * nr))" "$testdir/file1" >> "$seqres.full"
+"$XFS_IO_PROG" -f -c "pwrite -S 0x61 -b $((blksz * bsz)) 0 $((blksz * nr))" "$testdir/file2.chk" >> "$seqres.full"
+"$XFS_IO_PROG" -f -c "extsize $((blksz * bsz))" "$testdir/file2"
+_cp_reflink "$testdir/file1" "$testdir/file2" >> "$seqres.full"
+_scratch_remount
+
+echo "Compare files"
+md5sum "$testdir/file1" | _filter_scratch
+md5sum "$testdir/file2" | _filter_scratch
+md5sum "$testdir/file2.chk" | _filter_scratch
+
+echo "CoW and leave leftovers"
+"$XFS_IO_PROG" -f -c "extsize" "$testdir/file2" >> "$seqres.full"
+"$XFS_IO_PROG" -f -c "pwrite -S 0x63 $((blksz * nr - 1)) 1" -c "fsync" "$testdir/file2" >> "$seqres.full"
+"$XFS_IO_PROG" -f -c "pwrite -S 0x63 $((blksz * nr - 1)) 1" -c "fsync" "$testdir/file2.chk" >> "$seqres.full"
+sync
+
+echo "Crash and recover"
+"$XFS_IO_PROG" -x -c "shutdown" "$testdir/file2" >> "$seqres.full"
+_scratch_remount
+
+echo "Compare files"
+md5sum "$testdir/file1" | _filter_scratch
+md5sum "$testdir/file2" | _filter_scratch
+md5sum "$testdir/file2.chk" | _filter_scratch
+
+echo "Check for damage"
+umount "$SCRATCH_MNT"
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/212.out b/tests/xfs/212.out
new file mode 100644
index 0000000..24b35e2
--- /dev/null
+++ b/tests/xfs/212.out
@@ -0,0 +1,14 @@
+QA output created by 212
+Format and mount
+Create the original files
+Compare files
+7202826a7791073fe2787f0c94603278  SCRATCH_MNT/test-212/file1
+7202826a7791073fe2787f0c94603278  SCRATCH_MNT/test-212/file2
+7202826a7791073fe2787f0c94603278  SCRATCH_MNT/test-212/file2.chk
+CoW and leave leftovers
+Crash and recover
+Compare files
+7202826a7791073fe2787f0c94603278  SCRATCH_MNT/test-212/file1
+83feff041c88d5c746837552399dc27d  SCRATCH_MNT/test-212/file2
+83feff041c88d5c746837552399dc27d  SCRATCH_MNT/test-212/file2.chk
+Check for damage
diff --git a/tests/xfs/group b/tests/xfs/group
index 119e1fd..d4a0d59 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -209,6 +209,7 @@
 209 auto quick clone
 210 auto quick clone
 211 clone_stress
+212 auto quick clone
 216 log metadata auto quick
 217 log metadata auto
 220 auto quota quick