reflink: test ENOSPC when expanding btrees during reflink operations

See what happens when we ENOSPC while growing a btree on behalf of
some reflink operation.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

tests/xfs/139

@@ -0,0 +1,82 @@
+#! /bin/bash
+# FS QA Test No. 139
+#
+# Try to ENOSPC while expanding the refcntbt by CoWing every block
+# of a file that eats the whole AG.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015, 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
+_require_scratch_reflink
+_require_cp_reflink
+
+rm -f "$seqres.full"
+
+echo "Format and mount"
+_scratch_mkfs -d agsize=$((32 * 1048576)) > "$seqres.full" 2>&1
+_scratch_mount >> "$seqres.full" 2>&1
+
+TESTDIR="$SCRATCH_MNT/test-$seq"
+rm -rf "$TESTDIR"
+mkdir "$TESTDIR"
+BLKSZ="$(stat -f "$TESTDIR" -c '%S')"
+
+echo "Create the original files"
+SZ=$((48 * 1048576))
+NR=$((SZ / BLKSZ))
+_pwrite_byte 0x61 0 $SZ "$TESTDIR/file1" >> "$seqres.full"
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2" >> "$seqres.full"
+_scratch_remount
+
+echo "CoW every other block"
+_pwrite_byte 0x62 0 $SZ "$TESTDIR/file1" >> "$seqres.full"
+_scratch_remount
+
+echo "Compare files"
+md5sum "$TESTDIR/file1" | _filter_test_dir
+md5sum "$TESTDIR/file2" | _filter_test_dir
+#filefrag -v "$TESTDIR/file1" "$TESTDIR/file2"
+
+echo "Check scratch fs"
+umount "$SCRATCH_MNT"
+_check_scratch_fs
+
+# success, all done
+status=0
+exit

tests/xfs/139.out

@@ -0,0 +1,8 @@
+QA output created by 139
+Format and mount
+Create the original files
+CoW every other block
+Compare files
+673c759fb131ccf3336c4f8c549a497e  /opt/test-139/file1
+dc802351f6717547cbf4c951b294f952  /opt/test-139/file2
+Check scratch fs

tests/xfs/140

@@ -0,0 +1,89 @@
+#! /bin/bash
+# FS QA Test No. 140
+#
+# Try to ENOSPC while expanding the refcntbt by CoWing every other block
+# of a file that eats the whole AG.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015, 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
+_require_scratch_reflink
+_require_cp_reflink
+
+rm -f "$seqres.full"
+
+echo "Format and mount"
+_scratch_mkfs -d agsize=$((32 * 1048576)) > "$seqres.full" 2>&1
+_scratch_mount >> "$seqres.full" 2>&1
+
+TESTDIR="$SCRATCH_MNT/test-$seq"
+rm -rf "$TESTDIR"
+mkdir "$TESTDIR"
+BLKSZ="$(stat -f -c '%S' "$TESTDIR")"
+
+echo "Create the original files"
+SZ=$((48 * 1048576))
+NR=$((SZ / BLKSZ))
+_pwrite_byte 0x61 0 $SZ "$TESTDIR/file1" >> "$seqres.full"
+_cp_reflink "$TESTDIR/file1" "$TESTDIR/file2" >> "$seqres.full"
+_pwrite_byte 0x61 0 $SZ "$TESTDIR/file2.chk" >> "$seqres.full"
+_scratch_remount
+
+echo "Compare files"
+cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "file1 and file2 do not match"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+echo "CoW every other block"
+seq 1 2 $NR | while read f; do
+	_pwrite_byte 0x62 $((f * BLKSZ)) $BLKSZ "$TESTDIR/file2" >> "$seqres.full"
+	_pwrite_byte 0x62 $((f * BLKSZ)) $BLKSZ "$TESTDIR/file2.chk" >> "$seqres.full"
+done
+_scratch_remount
+
+echo "Compare files"
+! cmp -s "$TESTDIR/file1" "$TESTDIR/file2" || echo "file1 and file2 must not match"
+cmp -s "$TESTDIR/file2" "$TESTDIR/file2.chk" || echo "file2 and file2.chk do not match"
+
+echo "Check scratch fs"
+umount "$SCRATCH_MNT"
+_check_scratch_fs
+
+# success, all done
+status=0
+exit

tests/xfs/140.out

@@ -0,0 +1,7 @@
+QA output created by 140
+Format and mount
+Create the original files
+Compare files
+CoW every other block
+Compare files
+Check scratch fs

tests/xfs/group

@@ -136,6 +136,8 @@
 136 attr2
 137 auto metadata v2log
 138 auto quick quota
+139 auto quick clone
+140 auto quick clone
 142 dmapi
 143 dmapi
 144 dmapi