[PATCH v3] ceph/005: verify correct statfs behaviour with quotas

["Luís Henriques" <lhenriques@suse.de>]

When using a directory with 'max_bytes' quota as a base for a mount,
statfs shall use that 'max_bytes' value as the total disk size.  That
value shall be used even when using subdirectory as base for the mount.

A bug was found where, when this subdirectory also had a 'max_files'
quota, the real filesystem size would be returned instead of the parent
'max_bytes' quota value.  This test case verifies this bug is fixed.

Signed-off-by: Luís Henriques <lhenriques@suse.de>
---
Changes since v2:
 - correctly set SCRATCH_DEV, always using its original value

Changes since v1 are:
 - creation of an helper for getting total mount space using 'df'
 - now the test sends quota size to stdout

 common/rc          | 13 +++++++++++++
 tests/ceph/005     | 39 +++++++++++++++++++++++++++++++++++++++
 tests/ceph/005.out |  4 ++++
 3 files changed, 56 insertions(+)
 create mode 100755 tests/ceph/005
 create mode 100644 tests/ceph/005.out

diff --git a/common/rc b/common/rc
index 2f31ca464621..72eabb7a428c 100644
--- a/common/rc
+++ b/common/rc
@@ -4254,6 +4254,19 @@ _get_available_space()
 	echo $((avail_kb * 1024))
 }
 
+# get the total space in bytes
+#
+_get_total_space()
+{
+	if [ -z "$1" ]; then
+		echo "Usage: _get_total_space <mnt>"
+		exit 1
+	fi
+	local total_kb;
+	total_kb=`$DF_PROG $1 | tail -n1 | awk '{ print $3 }'`
+	echo $(($total_kb * 1024))
+}
+
 # return device size in kb
 _get_device_size()
 {
diff --git a/tests/ceph/005 b/tests/ceph/005
new file mode 100755
index 000000000000..fd71d91350db
--- /dev/null
+++ b/tests/ceph/005
@@ -0,0 +1,39 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2022 SUSE Linux Products GmbH. All Rights Reserved.
+#
+# FS QA Test 005
+#
+# Make sure statfs reports correct total size when:
+# 1. using a directory with 'max_byte' quota as base for a mount
+# 2. using a subdirectory of the above directory with 'max_files' quota
+#
+. ./common/preamble
+_begin_fstest auto quick quota
+
+_supported_fs ceph
+_require_scratch
+
+_scratch_mount
+mkdir -p "$SCRATCH_MNT/quota-dir/subdir"
+
+# set quota
+quota=$((2 ** 30)) # 1G 
+$SETFATTR_PROG -n ceph.quota.max_bytes -v "$quota" "$SCRATCH_MNT/quota-dir"
+$SETFATTR_PROG -n ceph.quota.max_files -v "$quota" "$SCRATCH_MNT/quota-dir/subdir"
+_scratch_unmount
+
+SCRATCH_DEV_ORIG="$SCRATCH_DEV"
+SCRATCH_DEV="$SCRATCH_DEV/quota-dir" _scratch_mount
+echo ceph quota size is $(_get_total_space "$SCRATCH_MNT") bytes
+SCRATCH_DEV="$SCRATCH_DEV_ORIG/quota-dir" _scratch_unmount
+
+SCRATCH_DEV="$SCRATCH_DEV_ORIG/quota-dir/subdir" _scratch_mount
+echo subdir ceph quota size is $(_get_total_space "$SCRATCH_MNT") bytes
+SCRATCH_DEV="$SCRATCH_DEV_ORIG/quota-dir/subdir" _scratch_unmount
+
+echo "Silence is golden"
+
+# success, all done
+status=0
+exit
diff --git a/tests/ceph/005.out b/tests/ceph/005.out
new file mode 100644
index 000000000000..47798b1fcd6f
--- /dev/null
+++ b/tests/ceph/005.out
@@ -0,0 +1,4 @@
+QA output created by 005
+ceph quota size is 1073741824 bytes
+subdir ceph quota size is 1073741824 bytes
+Silence is golden