[PATCH] ceph/001: add extra check for remote object copies

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

Ceph kernel client now has a facility to check stats for certain operations.
One of these operations is the 'copyfrom', the operation that is used to offload
to the OSDs the copy of objects from, for example, the copy_file_range()
syscall.

This patch changes ceph/001 to add an extra check to verify that the copies
performed by the test are _really_ remote copies and not simple read+write
operations.

Signed-off-by: Luís Henriques <lhenriques@suse.de>
---
 common/ceph    | 10 ++++++++
 tests/ceph/001 | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)

diff --git a/common/ceph b/common/ceph
index ca756dda8dd3..d6f24df177e7 100644
--- a/common/ceph
+++ b/common/ceph
@@ -28,3 +28,13 @@ _require_ceph_vxattr_caps()
 	$GETFATTR_PROG -n "ceph.caps" $TEST_DIR >/dev/null 2>&1 \
 	  || _notrun "ceph.caps vxattr not supported"
 }
+
+_ceph_get_cluster_fsid()
+{
+	$GETFATTR_PROG --only-values -n "ceph.cluster_fsid" $TEST_DIR 2>/dev/null
+}
+
+_ceph_get_client_id()
+{
+	$GETFATTR_PROG --only-values -n "ceph.client_id" $TEST_DIR 2>/dev/null
+}
diff --git a/tests/ceph/001 b/tests/ceph/001
index 5a828567d500..7970ce352bab 100755
--- a/tests/ceph/001
+++ b/tests/ceph/001
@@ -30,6 +30,10 @@ workdir=$TEST_DIR/test-$seq
 rm -rf $workdir
 mkdir $workdir
 
+cluster_fsid=$(_ceph_get_cluster_fsid)
+client_id=$(_ceph_get_client_id)
+metrics_dir="$DEBUGFS_MNT/ceph/$cluster_fsid.$client_id/metrics"
+
 check_range()
 {
 	local file=$1
@@ -40,8 +44,68 @@ check_range()
 	[ $? -eq 0 ] && echo "file $file is not '$val' in [ $off0 $off1 ]"
 }
 
+#
+# The metrics file has the following fields:
+#   1. item
+#   2. total
+#   3. avg_sz(bytes)
+#   4. min_sz(bytes)
+#   5. max_sz(bytes)
+#   6. total_sz(bytes)
+get_copyfrom_total_copies()
+{
+	local total=0
+
+	if [ -d $metrics_dir ]; then
+		total=$(grep copyfrom $metrics_dir/size | tr -s '[:space:]' | cut -d ' ' -f 2)
+	fi
+	echo $total
+}
+get_copyfrom_total_size()
+{
+	local total=0
+
+	if [ -d $metrics_dir ]; then
+		total=$(grep copyfrom $metrics_dir/size | tr -s '[:space:]' | cut -d ' ' -f 6)
+	fi
+	echo $total
+}
+
+# This function checks that the metrics file has the expected values for number
+# of remote object copies and the total size of the copies.  For this, it
+# expects a input:
+#   $1 - initial number copies in metrics file (field 'total')
+#   $2 - initial total size in bytes in metrics file (field 'total_sz')
+#   $3 - object size used for copies
+#   $4 - number of remote objects copied
+check_copyfrom_metrics()
+{
+	local c0=$1
+	local s0=$2
+	local objsz=$3
+	local copies=$4
+	local c1=$(get_copyfrom_total_copies)
+	local s1=$(get_copyfrom_total_size)
+	local sum
+
+	if [ ! -d $metrics_dir ]; then
+		return # skip metrics check if debugfs isn't mounted
+	fi
+
+	sum=$(($c0+$copies))
+	if [ $sum -ne $c1 ]; then
+		echo "Wrong number of remote copies.  Expected $sum, got $c1"
+	fi
+	sum=$(($s0+$copies*$objsz))
+	if [ $sum -ne $s1 ]; then
+		echo "Wrong size of remote copies.  Expected $sum, got $s1"
+	fi
+}
+
 run_copy_range_tests()
 {
+	total_copies=$(get_copyfrom_total_copies)
+	total_size=$(get_copyfrom_total_size)
 	objsz=$1
 	halfobj=$(($objsz / 2))
 	file="$workdir/file-$objsz"
@@ -203,6 +267,8 @@ run_copy_range_tests()
 	check_range $dest $(($objsz * 2 + $halfobj)) $objsz 63
 	check_range $dest $(($objsz * 3 + $halfobj)) $halfobj 64
 
+	# Confirm that we've done a total of 24 object copies
+	check_copyfrom_metrics $total_copies $total_size $objsz 24
 }
 
 echo "Object size: 65536" # CEPH_MIN_STRIPE_UNIT