tests/bcachefs: make check_counters more robust

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

tests/bcachefs/bcachefs-test-libs.sh

@@ -156,18 +156,32 @@ bcachefs_antagonist()
     #antagonist_switch_str_hash &
 }
 
+get_slowpath_counters()
+{
+    local dev=$1
+
+    bcachefs show-super --field-only counters "$dev"|
+	grep  -E '(fail|restart|blocked|full)'|
+	grep -vE '(path_relock_fail|mem_realloced)'|
+	grep -v  ' 0$' || true
+}
+
 check_counters()
 {
     local dev=$1
     local nr_commits=$(bcachefs show-super -f counters "$dev"|awk '/transaction_commit/ {print $2}')
     local ratio=10
     local ret=0
 
+    [[ -z $nr_commits ]] && return 0
+
     [[ $# -ge 2 ]] && ratio=$2
 
     local max_fail=$((nr_commits / ratio))
 
-    local counters=$(bcachefs show-super -f counters "$dev"|grep -E '(fail|restart|blocked)'|grep -v path_relock_fail|grep -v mem_realloced)
+    local counters=$(set +e; set +o pipefail; get_slowpath_counters $dev)
+
+    [[ -z $counters ]] && return 0
 
     while IFS= read -r line; do
 	linea=($line)