[PATCH] fstest: btrfs: add a test for quota number when deleting a subvol.

[Dongsheng Yang <yangds.fnst@cn.fujitsu.com>]

This regression is introduced by two commits:

e339a6b0 (Btrfs: __btrfs_mod_ref should always use no_quota)
1152651a (btrfs: qgroup: account shared subtrees during snapshot delete)

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
---
 tests/btrfs/084     | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/084.out |  3 ++
 tests/btrfs/group   |  1 +
 3 files changed, 88 insertions(+)
 create mode 100755 tests/btrfs/084
 create mode 100644 tests/btrfs/084.out

diff --git a/tests/btrfs/084 b/tests/btrfs/084
new file mode 100755
index 0000000..7b7c7ac
--- /dev/null
+++ b/tests/btrfs/084
@@ -0,0 +1,84 @@
+#! /bin/bash
+# FS QA Test No. 084
+#
+# This is a case for the regression introduced by
+#
+# e339a6b0 (Btrfs: __btrfs_mod_ref should always use no_quota)
+# 1152651a (btrfs: qgroup: account shared subtrees during snapshot delete)
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2015 Fujitsu.  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 $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_need_to_be_root
+_supported_fs btrfs
+_supported_os Linux
+_require_scratch
+
+_scratch_mount
+
+$XFS_IO_PROG -f -d -c "pwrite 0 8K" $SCRATCH_MNT/foo 2>&1 > /dev/null
+
+_run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/snap
+
+_run_btrfs_util_prog quota enable $SCRATCH_MNT
+_run_btrfs_util_prog quota rescan -w $SCRATCH_MNT
+
+units=`_btrfs_qgroup_units`
+orig_result=`$BTRFS_UTIL_PROG qgroup show $units $SCRATCH_MNT | $AWK_PROG 'NR==NF {print $3}'`
+
+_run_btrfs_util_prog subvolume delete $SCRATCH_MNT/snap
+
+_run_btrfs_util_prog filesystem sync $SCRATCH_MNT
+
+timeout=100
+# There is a background thread doing the clean work
+for ((i=0; i<$timeout; i++))
+do
+	result=`$BTRFS_UTIL_PROG qgroup show $units $SCRATCH_MNT | $AWK_PROG 'NR==NF {print $3}'`
+	if (($orig_result != $result))
+	then
+		break
+	fi
+	sleep 1
+done
+
+$BTRFS_UTIL_PROG qgroup show $units $SCRATCH_MNT | $AWK_PROG '/[0-9]/ {print $2" "$3}'
+
+# success, all done
+status=0
+exit
diff --git a/tests/btrfs/084.out b/tests/btrfs/084.out
new file mode 100644
index 0000000..7bf6dbf
--- /dev/null
+++ b/tests/btrfs/084.out
@@ -0,0 +1,3 @@
+QA output created by 084
+24576 24576
+0 0
diff --git a/tests/btrfs/group b/tests/btrfs/group
index fe82a9c..1be7392 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -86,3 +86,4 @@
 081 auto quick clone
 082 auto quick remount
 083 auto quick send
+084 qgroup
-- 
1.8.4.2