ceph/001: add extra check for remote object copies

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>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/common/ceph b/common/ceph
index ca756dda8d..d6f24df177 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" $TEST_DIR 2>/dev/null
+}
diff --git a/tests/ceph/001 b/tests/ceph/001
index 5a828567d5..7970ce352b 100755
--- a/tests/ceph/001
+++ b/tests/ceph/001
@@ -30,6 +30,10 @@ workdir=$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