LU-14912 obdclass: prefer T10 checksum if the target supports it

[fs/lustre-release.git] / lustre / include / obd_cksum.h

diff --git a/lustre/include/obd_cksum.h b/lustre/include/obd_cksum.h
index 8234d0b..029d1a7 100644 (file)
--- a/lustre/include/obd_cksum.h
+++ b/lustre/include/obd_cksum.h
@@ -121,6 +121,13 @@ enum cksum_types obd_cksum_type_select(const char *obd_name,
        if (preferred & cksum_types)
                return preferred;
 
+       /*
+        * Server reporting a single T10 checksum type
+        * means the target actually supports T10-PI.
+        */
+       if (hweight32(cksum_types & OBD_CKSUM_T10_ALL) == 1)
+               return cksum_types & OBD_CKSUM_T10_ALL;
+
        flag = obd_cksum_type_pack(obd_name, cksum_types);
 
        return obd_cksum_type_unpack(flag);